City Council Meeting Agenda
October 13, 2025

Calculation of Borehole Permeability
Project Name Weston Solutions-BMP Infiltration
Project Number LA-1225
Location Marina Del Rey
Boring B-4
Date 05-Feb-15

INPUT DATA
Length of Test Section - feet 2
Top of casing above bottom of test section 2.5 4
Inside Radius Test Section 0.085417
Effective Radius of Test Section 0.333 Date/Time Converstion Date of First Reading 02/03/15 02/03/15
Time of First Reading Hours 0 0
Minutes 0 42038
Seconds 0
Date of Second Reading 02/03/15 42038
Time of Second Reading Hours 0 0.0028935
Minutes 0 42038.003
Seconds 250
First Reading - below top of casing (feet) 0
Second Reading - below top of casing (feet) 0.16
Calculation
Time Change - seconds 250.0
First Height - above bottom of Test Section 2.5
Second Height - above bottom of Test Section 2.34
Equation 4 by Jarvis in Groundwater Manual page 284
A=r^2/2At 0.0000072960639
B=ASINH(A/re)/2 1.246383377
C=2H1-A 3
D=2H2-A 2.68
E=2H1H2-Ah2 7.02
F=2H1H2-Ah1 6.7
K=A(B*ln(C/D)-ln(E/F)) 6.85E-07 feet/sec

2.09E-05 cm/sec

0.030 inch/hour

2.1E-05 cm/sec
Equation by Hvorslev, Case D, Figure 2.20 page 63 Cedergren kh/kv (1) 10000
m = (kh/kv)0.5 100
x = 4Lm/D 2402.4
Y = h1/h2 1.1
t = t1-t2 250.0
K = d2*ln(x)*ln(Y)/(8*L*(t2-t1)) 9.4E-07 feet/ sec

2.86E-05 cm/sec

0.041 inch/hour

2.9E-05 cm/sec
(1) For a bottom seal at the well, used kh/kv = 10000
References: Cedergren, H. R/, " Seepage, Drainage and Flow Nets," 3rd Edition, John Wiley & Sons, N.Y.

U.S. Department of the Interior, Bureau of Reclamation, " Groundwater Manual, A water Resources Technical Publication, " Reprint 1985.

Calculation of Borehole Permeability
Project Name Weston Solutions-BMP Infiltration
Project Number LA-1225
Location Marina Del Rey
Boring B-5
Date 05-Feb-15

INPUT DATA
Length of Test Section - feet 4
Top of casing above bottom of test section 10 4
Inside Radius Test Section 0.085417
Effective Radius of Test Section 0.333 Date/Time Converstion Date of First Reading 02/04/15 02/04/15
Time of First Reading Hours 0 0
Minutes 0 42039
Seconds 0
Date of Second Reading 02/04/15 42039
Time of Second Reading Hours 0 0.0012269
Minutes 0 42039.001
Seconds 106
First Reading - below top of casing (feet) 0
Second Reading - below top of casing (feet) 6
Calculation
Time Change - seconds 106.0
First Height - above bottom of Test Section 10
Second Height - above bottom of Test Section 4
Equation 4 by Jarvis in Groundwater Manual page 284
A=r^2/2At 0.0000086038489
B=ASINH(A/re)/2 1.590391243
C=2H1-A 16
D=2H2-A 4
E=2H1H2-Ah2 64
F=2H1H2-Ah1 40
K=A(B*ln(C/D)-ln(E/F)) 1.49E-05 feet/sec

4.55E-04 cm/sec

0.645 inch/hour

4.5E-04 cm/sec
Equation by Hvorslev, Case D, Figure 2.20 page 63 Cedergren kh/kv (1) 10000
m = (kh/kv)0.5 100
x = 4Lm/D 4804.8
Y = h1/h2 2.5
t = t1-t2 106.0
K = d2*ln(x)*ln(Y)/(8*L*(t2-t1)) 1.7E-05 feet/ sec

5.09E-04 cm/sec

0.722 inch/hour

5.1E-04 cm/sec
(1) For a bottom seal at the well, used kh/kv = 10000
References: Cedergren, H. R/, " Seepage, Drainage and Flow Nets," 3rd Edition, John Wiley & Sons, N.Y.

U.S. Department of the Interior, Bureau of Reclamation, " Groundwater Manual, A water Resources Technical Publication, " Reprint 1985.

Calculation of Borehole Permeability
Project Name Weston Solutions-BMP Infiltration
Project Number LA-1225
Location Marina Del Rey
Boring B-6a
Date 05-Feb-15

INPUT DATA
Length of Test Section - feet 4
Top of casing above bottom of test section 10 4
Inside Radius Test Section 0.085417
Effective Radius of Test Section 0.333 Date/Time Converstion Date of First Reading 02/02/15 02/02/15
Time of First Reading Hours 0 0
Minutes 0 42037
Seconds 0
Date of Second Reading 02/02/15 42037
Time of Second Reading Hours 0 0.0043981
Minutes 0 42037.004
Seconds 380
First Reading - below top of casing (feet) 0
Second Reading - below top of casing (feet) 0.25
Calculation
Time Change - seconds 380.0
First Height - above bottom of Test Section 10
Second Height - above bottom of Test Section 9.75
Equation 4 by Jarvis in Groundwater Manual page 284
A=r^2/2At 0.0000024000210
B=ASINH(A/re)/2 1.590391243
C=2H1-A 16
D=2H2-A 15.5
E=2H1H2-Ah2 156
F=2H1H2-Ah1 155
K=A(B*ln(C/D)-ln(E/F)) 1.06E-07 feet/sec

3.22E-06 cm/sec

0.005 inch/hour

3.2E-06 cm/sec
Equation by Hvorslev, Case D, Figure 2.20 page 63 Cedergren kh/kv (1) 10000
m = (kh/kv)0.5 100
x = 4Lm/D 4804.8
Y = h1/h2 1.0
t = t1-t2 380.0
K = d2*ln(x)*ln(Y)/(8*L*(t2-t1)) 1.3E-07 feet/ sec

3.93E-06 cm/sec

0.006 inch/hour

3.9E-06 cm/sec
(1) For a bottom seal at the well, used kh/kv = 10000
References: Cedergren, H. R/, " Seepage, Drainage and Flow Nets," 3rd Edition, John Wiley & Sons, N.Y.

U.S. Department of the Interior, Bureau of Reclamation, " Groundwater Manual, A water Resources Technical Publication, " Reprint 1985.

Calculation of Borehole Permeability
Project Name Weston Solutions-BMP Infiltration
Project Number LA-1225
Location Marina Del Rey
Boring B-6b
Date 05-Feb-15

INPUT DATA
Length of Test Section - feet 3
Top of casing above bottom of test section 15 4
Inside Radius Test Section 0.085417
Effective Radius of Test Section 0.333 Date/Time Converstion Date of First Reading 02/02/15 02/02/15
Time of First Reading Hours 0 0
Minutes 0 42037
Seconds 0
Date of Second Reading 02/02/15 42037
Time of Second Reading Hours 0 0.0015625
Minutes 0 42037.002
Seconds 135
First Reading - below top of casing (feet) 0
Second Reading - below top of casing (feet) 12
Calculation
Time Change - seconds 135.0
First Height - above bottom of Test Section 15
Second Height - above bottom of Test Section 3
Equation 4 by Jarvis in Groundwater Manual page 284
A=r^2/2At 0.0000090074863
B=ASINH(A/re)/2 1.447219186
C=2H1-A 27
D=2H2-A 3
E=2H1H2-Ah2 81
F=2H1H2-Ah1 45
K=A(B*ln(C/D)-ln(E/F)) 2.33E-05 feet/sec

7.12E-04 cm/sec

1.009 inch/hour

7.1E-04 cm/sec
Equation by Hvorslev, Case D, Figure 2.20 page 63 Cedergren kh/kv (1) 10000
m = (kh/kv)0.5 100
x = 4Lm/D 3603.6
Y = h1/h2 5.0
t = t1-t2 135.0
K = d2*ln(x)*ln(Y)/(8*L*(t2-t1)) 3.0E-05 feet/ sec

9.05E-04 cm/sec

1.282 inch/hour

9.0E-04 cm/sec
(1) For a bottom seal at the well, used kh/kv = 10000
References: Cedergren, H. R/, " Seepage, Drainage and Flow Nets," 3rd Edition, John Wiley & Sons, N.Y.

U.S. Department of the Interior, Bureau of Reclamation, " Groundwater Manual, A water Resources Technical Publication, " Reprint 1985.

Calculation of Borehole Permeability
Project Name Weston Solutions-BMP Infiltration
Project Number LA-1225
Location Marina Del Rey
Boring B-7
Date 05-Feb-15

INPUT DATA
Length of Test Section - feet 4
Top of casing above bottom of test section 12 4
Inside Radius Test Section 0.085417
Effective Radius of Test Section 0.333 Date/Time Converstion Date of First Reading 02/04/15 02/04/15
Time of First Reading Hours 0 0
Minutes 0 42039
Seconds 0
Date of Second Reading 02/04/15 42039
Time of Second Reading Hours 0 0.0012037
Minutes 0 42039.001
Seconds 104
First Reading - below top of casing (feet) 0
Second Reading - below top of casing (feet) 8
Calculation
Time Change - seconds 104.0
First Height - above bottom of Test Section 12
Second Height - above bottom of Test Section 4
Equation 4 by Jarvis in Groundwater Manual page 284
A=r^2/2At 0.0000087693076
B=ASINH(A/re)/2 1.590391243
C=2H1-A 20
D=2H2-A 4
E=2H1H2-Ah2 80
F=2H1H2-Ah1 48
K=A(B*ln(C/D)-ln(E/F)) 1.80E-05 feet/sec

5.48E-04 cm/sec

0.776 inch/hour

5.5E-04 cm/sec
Equation by Hvorslev, Case D, Figure 2.20 page 63 Cedergren kh/kv (1) 10000
m = (kh/kv)0.5 100
x = 4Lm/D 4804.8
Y = h1/h2 3.0
t = t1-t2 104.0
K = d2*ln(x)*ln(Y)/(8*L*(t2-t1)) 2.0E-05 feet/ sec

6.22E-04 cm/sec

0.882 inch/hour

6.2E-04 cm/sec
(1) For a bottom seal at the well, used kh/kv = 10000
References: Cedergren, H. R/, " Seepage, Drainage and Flow Nets," 3rd Edition, John Wiley & Sons, N.Y.

U.S. Department of the Interior, Bureau of Reclamation, " Groundwater Manual, A water Resources Technical Publication, " Reprint 1985.

Calculation of Borehole Permeability
Project Name Weston Solutions-BMP Infiltration
Project Number LA-1225
Location Marina Del Rey
Boring B-9
Date 18-Feb-15

INPUT DATA
Length of Test Section - feet 5
Top of casing above bottom of test section 17 4
Inside Radius Test Section 0.085417
Effective Radius of Test Section 0.333 Date/Time Converstion Date of First Reading 02/18/15 02/18/15
Time of First Reading Hours 0 0
Minutes 0 42053
Seconds 0
Date of Second Reading 02/18/15 42053
Time of Second Reading Hours 0 8.102E-05
Minutes 0 42053
Seconds 7
First Reading - below top of casing (feet) 0
Second Reading - below top of casing (feet) 9
Calculation
Time Change - seconds 7.0
First Height - above bottom of Test Section 17
Second Height - above bottom of Test Section 8
Equation 4 by Jarvis in Groundwater Manual page 284
A=r^2/2At 0.0001042294878
B=ASINH(A/re)/2 1.701652466
C=2H1-A 29
D=2H2-A 11
E=2H1H2-Ah2 232
F=2H1H2-Ah1 187
K=A(B*ln(C/D)-ln(E/F)) 1.49E-04 feet/sec

4.56E-03 cm/sec

6.457 inch/hour

4.6E-03 cm/sec
Equation by Hvorslev, Case D, Figure 2.20 page 63 Cedergren kh/kv (1) 10000
m = (kh/kv)0.5 100
x = 4Lm/D 6006.0
Y = h1/h2 2.1
t = t1-t2 7.0
K = d2*ln(x)*ln(Y)/(8*L*(t2-t1)) 1.7E-04 feet/ sec

5.21E-03 cm/sec

7.382 inch/hour

5.2E-03 cm/sec
(1) For a bottom seal at the well, used kh/kv = 10000
References: Cedergren, H. R/, " Seepage, Drainage and Flow Nets," 3rd Edition, John Wiley & Sons, N.Y.

U.S. Department of the Interior, Bureau of Reclamation, " Groundwater Manual, A water Resources Technical Publication, " Reprint 1985.

Calculation of Borehole Permeability
Project Name Weston Solutions-BMP Infiltration
Project Number LA-1225
Location Marina Del Rey
Boring B-10
Date 18-Feb-15

INPUT DATA
Length of Test Section - feet 5
Top of casing above bottom of test section 17 4
Inside Radius Test Section 0.085417
Effective Radius of Test Section 0.333 Date/Time Converstion Date of First Reading 02/18/15 02/18/15
Time of First Reading Hours 0 0
Minutes 0 42053
Seconds 0
Date of Second Reading 02/18/15 42053
Time of Second Reading Hours 0 0.0003009
Minutes 0 42053
Seconds 26
First Reading - below top of casing (feet) 0
Second Reading - below top of casing (feet) 9
Calculation
Time Change - seconds 26.0
First Height - above bottom of Test Section 17
Second Height - above bottom of Test Section 8
Equation 4 by Jarvis in Groundwater Manual page 284
A=r^2/2At 0.0000280617844
B=ASINH(A/re)/2 1.701652466
C=2H1-A 29
D=2H2-A 11
E=2H1H2-Ah2 232
F=2H1H2-Ah1 187
K=A(B*ln(C/D)-ln(E/F)) 4.02E-05 feet/sec

1.23E-03 cm/sec

1.738 inch/hour

1.2E-03 cm/sec
Equation by Hvorslev, Case D, Figure 2.20 page 63 Cedergren kh/kv (1) 10000
m = (kh/kv)0.5 100
x = 4Lm/D 6006.0
Y = h1/h2 2.1
t = t1-t2 26.0
K = d2*ln(x)*ln(Y)/(8*L*(t2-t1)) 4.6E-05 feet/ sec

1.40E-03 cm/sec

1.988 inch/hour

1.4E-03 cm/sec
(1) For a bottom seal at the well, used kh/kv = 10000
References: Cedergren, H. R/, " Seepage, Drainage and Flow Nets," 3rd Edition, John Wiley & Sons, N.Y.

U.S. Department of the Interior, Bureau of Reclamation, " Groundwater Manual, A water Resources Technical Publication, " Reprint 1985.

HYDROLOGY /MS 4 STUDY
GAS STATION RELOCATION - COSTCO CULVER CITY M AY 2024

COSTCO WHOLESALE

APPENDIX C

Pre Development
Hydrology Calculations
Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix C - Pre Dev Hydro Calcs/156-030-Pre-2yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 552.0
Flow Path Slope (vft/hft) 0.02
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 2-yr
Fire Factor 0
LID False
Output Results
Modeled (2-yr) Rainfall Depth (in) 2.1208
Peak Intensity (in/hr) 0.8075
Undeveloped Runoff Coefficient (Cu) 0.4462
Developed Runoff Coefficient (Cd) 0.8773
Time of Concentration (min) 13.0
Clear Peak Flow Rate (cfs) 1.594
Burned Peak Flow Rate (cfs) 1.594
24-Hr Clear Runoff Volume (ac-ft) 0.3396
24-Hr Clear Runoff Volume (cu-ft) 14793.872

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix C - Pre Dev Hydro Calcs/156-030-Pre-5yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 552.0
Flow Path Slope (vft/hft) 0.02
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 5-yr
Fire Factor 0
LID False
Output Results
Modeled (5-yr) Rainfall Depth (in) 3.2003
Peak Intensity (in/hr) 1.3785
Undeveloped Runoff Coefficient (Cu) 0.6442
Developed Runoff Coefficient (Cd) 0.8872
Time of Concentration (min) 10.0
Clear Peak Flow Rate (cfs) 2.7518
Burned Peak Flow Rate (cfs) 2.7518
24-Hr Clear Runoff Volume (ac-ft) 0.5132
24-Hr Clear Runoff Volume (cu-ft) 22353.1912

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix C - Pre Dev Hydro Calcs/156-030-Pre-10yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 552.0
Flow Path Slope (vft/hft) 0.02
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 10-yr
Fire Factor 0
LID False
Output Results
Modeled (10-yr) Rainfall Depth (in) 3.9127
Peak Intensity (in/hr) 1.7709
Undeveloped Runoff Coefficient (Cu) 0.7209
Developed Runoff Coefficient (Cd) 0.891
Time of Concentration (min) 9.0
Clear Peak Flow Rate (cfs) 3.5505
Burned Peak Flow Rate (cfs) 3.5505
24-Hr Clear Runoff Volume (ac-ft) 0.6279
24-Hr Clear Runoff Volume (cu-ft) 27350.3349

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix C - Pre Dev Hydro Calcs/156-030-Pre-25yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 552.0
Flow Path Slope (vft/hft) 0.02
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 25-yr
Fire Factor 0
LID False
Output Results
Modeled (25-yr) Rainfall Depth (in) 4.8114
Peak Intensity (in/hr) 2.3017
Undeveloped Runoff Coefficient (Cu) 0.7896
Developed Runoff Coefficient (Cd) 0.8945
Time of Concentration (min) 8.0
Clear Peak Flow Rate (cfs) 4.6323
Burned Peak Flow Rate (cfs) 4.6323
24-Hr Clear Runoff Volume (ac-ft) 0.7728
24-Hr Clear Runoff Volume (cu-ft) 33665.2959

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix C - Pre Dev Hydro Calcs/156-030-Pre-50yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 552.0
Flow Path Slope (vft/hft) 0.02
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 50-yr
Fire Factor 0
LID False
Output Results
Modeled (50-yr) Rainfall Depth (in) 5.48
Peak Intensity (in/hr) 2.7913
Undeveloped Runoff Coefficient (Cu) 0.8333
Developed Runoff Coefficient (Cd) 0.8967
Time of Concentration (min) 7.0
Clear Peak Flow Rate (cfs) 5.6314
Burned Peak Flow Rate (cfs) 5.6314
24-Hr Clear Runoff Volume (ac-ft) 0.8809
24-Hr Clear Runoff Volume (cu-ft) 38371.3393

HYDROLOGY /MS 4 STUDY
GAS STATION RELOCATION - COSTCO CULVER CITY M AY 2024

COSTCO WHOLESALE

APPENDIX D

Post Development
Hydrology Calculations

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix D - Post Dev Hydro Calcs/156-030-Post-2yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 708.0
Flow Path Slope (vft/hft) 0.015
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 2-yr
Fire Factor 0
LID False
Output Results
Modeled (2-yr) Rainfall Depth (in) 2.1208
Peak Intensity (in/hr) 0.7119
Undeveloped Runoff Coefficient (Cu) 0.3837
Developed Runoff Coefficient (Cd) 0.8742
Time of Concentration (min) 17.0
Clear Peak Flow Rate (cfs) 1.4002
Burned Peak Flow Rate (cfs) 1.4002
24-Hr Clear Runoff Volume (ac-ft) 0.3396
24-Hr Clear Runoff Volume (cu-ft) 14790.8983

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix D - Post Dev Hydro Calcs/156-030-Post-5yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 708.0
Flow Path Slope (vft/hft) 0.015
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 5-yr
Fire Factor 0
LID False
Output Results
Modeled (5-yr) Rainfall Depth (in) 3.2003
Peak Intensity (in/hr) 1.2653
Undeveloped Runoff Coefficient (Cu) 0.6129
Developed Runoff Coefficient (Cd) 0.8856
Time of Concentration (min) 12.0
Clear Peak Flow Rate (cfs) 2.5214
Burned Peak Flow Rate (cfs) 2.5214
24-Hr Clear Runoff Volume (ac-ft) 0.5131
24-Hr Clear Runoff Volume (cu-ft) 22352.3609

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix D - Post Dev Hydro Calcs/156-030-Post-10yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 708.0
Flow Path Slope (vft/hft) 0.015
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 10-yr
Fire Factor 0
LID False
Output Results
Modeled (10-yr) Rainfall Depth (in) 3.9127
Peak Intensity (in/hr) 1.6115
Undeveloped Runoff Coefficient (Cu) 0.6955
Developed Runoff Coefficient (Cd) 0.8898
Time of Concentration (min) 11.0
Clear Peak Flow Rate (cfs) 3.2263
Burned Peak Flow Rate (cfs) 3.2263
24-Hr Clear Runoff Volume (ac-ft) 0.6279
24-Hr Clear Runoff Volume (cu-ft) 27349.7244

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix D - Post Dev Hydro Calcs/156-030-Post-25yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 708.0
Flow Path Slope (vft/hft) 0.015
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 25-yr
Fire Factor 0
LID False
Output Results
Modeled (25-yr) Rainfall Depth (in) 4.8114
Peak Intensity (in/hr) 2.1777
Undeveloped Runoff Coefficient (Cu) 0.7763
Developed Runoff Coefficient (Cd) 0.8938
Time of Concentration (min) 9.0
Clear Peak Flow Rate (cfs) 4.3796
Burned Peak Flow Rate (cfs) 4.3796
24-Hr Clear Runoff Volume (ac-ft) 0.7728
24-Hr Clear Runoff Volume (cu-ft) 33664.9606

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix D - Post Dev Hydro Calcs/156-030-Post-50yr-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 2.25
Flow Path Length (ft) 708.0
Flow Path Slope (vft/hft) 0.015
50-yr Rainfall Depth (in) 5.48
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 50-yr
Fire Factor 0
LID False
Output Results
Modeled (50-yr) Rainfall Depth (in) 5.48
Peak Intensity (in/hr) 2.6215
Undeveloped Runoff Coefficient (Cu) 0.8201
Developed Runoff Coefficient (Cd) 0.896
Time of Concentration (min) 8.0
Clear Peak Flow Rate (cfs) 5.285
Burned Peak Flow Rate (cfs) 5.285
24-Hr Clear Runoff Volume (ac-ft) 0.8809
24-Hr Clear Runoff Volume (cu-ft) 38371.0018

HYDROLOGY /MS 4 STUDY
GAS STATION RELOCATION - COSTCO CULVER CITY M AY 2024

COSTCO WHOLESALE

APPENDIX E

85 th Percentile
Hydrology Calculations

Peak Flow Hydrologic Analysis
File location: F:/Projects/156/030/_12/_Support Files/Reports/Hydrology-LID/Appendix E - 85th Percentile Hydro Calcs/156-030-LID-85th-Site.pdf Version: HydroCalc 1.0.2
Input Parameters
Project Name Culver City Gas Relocation
Subarea ID Site
Area (ac) 0.71
Flow Path Length (ft) 585.0
Flow Path Slope (vft/hft) 0.015
85th Percentile Rainfall Depth (in) 1.08
Percent Impervious 0.95
Soil Type 16
Design Storm Frequency 85th percentile storm
Fire Factor 0
LID True
Output Results
Modeled (85th percentile storm) Rainfall Depth (in) 1.08 Peak Intensity (in/hr) 0.3083
Undeveloped Runoff Coefficient (Cu) 0.1
Developed Runoff Coefficient (Cd) 0.86
Time of Concentration (min) 24.0
Clear Peak Flow Rate (cfs) 0.1882
Burned Peak Flow Rate (cfs) 0.1882
24-Hr Clear Runoff Volume (ac-ft) 0.0545
24-Hr Clear Runoff Volume (cu-ft) 2374.0302

HYDROLOGY /MS 4 STUDY
GAS STATION RELOCATION - COSTCO CULVER CITY M AY 2024

COSTCO WHOLESALE

APPENDIX F

BMP Information and Volume
Calculations
©2022 ADS, INC.

PROJECT INFORMATIONADS SALES REP:ENGINEEREDPRODUCTMANAGER:PROJECT NO:COSTO WHOLESALE CULVER CITY, CA ROHIT [email protected] Drainage Systems, Inc.TRAVIS [email protected] MC-3500 STORMTECH CHAMBER SPECIFICATIONS1.CHAMBERS SHALL BE STORMTECH MC-3500.2.CHAMBERS SHALL BE ARCH-SHAPED AND SHALL BE MANUFACTURED FROM VIRGIN, IMPACT-MODIFIED POLYPROPYLENECOPOLYMERS.3.CHAMBERS SHALL MEET THE REQUIREMENTS OF ASTM F2418, "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATEDWALL STORMWATER COLLECTION CHAMBERS" CHAMBER CLASSIFICATION 45x76 DESIGNATION SS.4.CHAMBER ROWS SHALL PROVIDE CONTINUOUS, UNOBSTRUCTED INTERNAL SPACE WITH NO INTERNAL SUPPORTS THAT WOULDIMPEDE FLOW OR LIMIT ACCESS FOR INSPECTION.5.THE STRUCTURAL DESIGN OF THE CHAMBERS, THE STRUCTURAL BACKFILL, AND THE INSTALLATION REQUIREMENTS SHALL ENSURETHAT THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS, SECTION 12.12, ARE MET FOR: 1)LONG-DURATION DEAD LOADS AND 2) SHORT-DURATION LIVE LOADS, BASED ON THE AASHTO DESIGN TRUCK WITH CONSIDERATIONFOR IMPACT AND MULTIPLE VEHICLE PRESENCES.6.CHAMBERS SHALL BE DESIGNED, TESTED AND ALLOWABLE LOAD CONFIGURATIONS DETERMINED IN ACCORDANCE WITH ASTM F2787,"STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".LOAD CONFIGURATIONS SHALL INCLUDE: 1) INSTANTANEOUS (<1 MIN) AASHTO DESIGN TRUCK LIVE LOAD ON MINIMUM COVER 2)MAXIMUM PERMANENT (75-YR) COVER LOAD AND 3) ALLOWABLE COVER WITH PARKED (1-WEEK) AASHTO DESIGN TRUCK.7.REQUIREMENTS FOR HANDLING AND INSTALLATION:·TO MAINTAIN THE WIDTH OF CHAMBERS DURING SHIPPING AND HANDLING, CHAMBERS SHALL HAVE INTEGRAL, INTERLOCKINGSTACKING LUGS.·TO ENSURE A SECURE JOINT DURING INSTALLATION AND BACKFILL, THE HEIGHT OF THE CHAMBER JOINT SHALL NOT BE LESSTHAN 3”.·TO ENSURE THE INTEGRITY OF THE ARCH SHAPE DURING INSTALLATION, a) THE ARCH STIFFNESS CONSTANT SHALL BEGREATER THAN OR EQUAL TO 450 LBS/FT/%. THE ASC IS DEFINED IN SECTION 6.2.8 OF ASTM F2418. AND b) TO RESISTCHAMBER DEFORMATION DURING INSTALLATION AT ELEVATED TEMPERATURES (ABOVE 73° F / 23° C), CHAMBERS SHALL BEPRODUCED FROM REFLECTIVE GOLD OR YELLOW COLORS.8.ONLY CHAMBERS THAT ARE APPROVED BY THE SITE DESIGN ENGINEER WILL BE ALLOWED. UPON REQUEST BY THE SITE DESIGNENGINEER OR OWNER, THE CHAMBER MANUFACTURER SHALL SUBMIT A STRUCTURAL EVALUATION FOR APPROVAL BEFOREDELIVERING CHAMBERS TO THE PROJECT SITE AS FOLLOWS:·THE STRUCTURAL EVALUATION SHALL BE SEALED BY A REGISTERED PROFESSIONAL ENGINEER.·THE STRUCTURAL EVALUATION SHALL DEMONSTRATE THAT THE SAFETY FACTORS ARE GREATER THAN OR EQUAL TO 1.95 FORDEAD LOAD AND 1.75 FOR LIVE LOAD, THE MINIMUM REQUIRED BY ASTM F2787 AND BY SECTIONS 3 AND 12.12 OF THE AASHTOLRFD BRIDGE DESIGN SPECIFICATIONS FOR THERMOPLASTIC PIPE.·THE TEST DERIVED CREEP MODULUS AS SPECIFIED IN ASTM F2418 SHALL BE USED FOR PERMANENT DEAD LOAD DESIGNEXCEPT THAT IT SHALL BE THE 75-YEAR MODULUS USED FOR DESIGN.9.CHAMBERS AND END CAPS SHALL BE PRODUCED AT AN ISO 9001 CERTIFIED MANUFACTURING FACILITY.

IMPORTANT - NOTES FOR THE BIDDING AND INSTALLATION OF MC-3500 CHAMBER SYSTEM1.STORMTECH MC-3500 CHAMBERS SHALL NOT BE INSTALLED UNTIL THE MANUFACTURER'S REPRESENTATIVE HAS COMPLETED APRE-CONSTRUCTION MEETING WITH THE INSTALLERS.2.STORMTECH MC-3500 CHAMBERS SHALL BE INSTALLED IN ACCORDANCE WITH THE "STORMTECH MC-3500/MC-4500 CONSTRUCTION GUIDE".3.CHAMBERS ARE NOT TO BE BACKFILLED WITH A DOZER OR AN EXCAVATOR SITUATED OVER THE CHAMBERS.STORMTECH RECOMMENDS 3 BACKFILL METHODS:·STONESHOOTER LOCATED OFF THE CHAMBER BED.·BACKFILL AS ROWS ARE BUILT USING AN EXCAVATOR ON THE FOUNDATION STONE OR SUBGRADE.·BACKFILL FROM OUTSIDE THE EXCAVATION USING A LONG BOOM HOE OR EXCAVATOR.4.THE FOUNDATION STONE SHALL BE LEVELED AND COMPACTED PRIOR TO PLACING CHAMBERS.5.JOINTS BETWEEN CHAMBERS SHALL BE PROPERLY SEATED PRIOR TO PLACING STONE.6.MAINTAIN MINIMUM - SPACING BETWEEN THE CHAMBER ROWS.7.INLET AND OUTLET MANIFOLDS MUST BE INSERTED A MINIMUM OF 12" (300 mm) INTO CHAMBER END CAPS.8.EMBEDMENT STONE SURROUNDING CHAMBERS MUST BE A CLEAN, CRUSHED, ANGULAR STONE MEETING THE AASHTO M43 DESIGNATION OF #3OR #4.9.STONE MUST BE PLACED ON THE TOP CENTER OF THE CHAMBER TO ANCHOR THE CHAMBERS IN PLACE AND PRESERVE ROW SPACING.10.THE CONTRACTOR MUST REPORT ANY DISCREPANCIES WITH CHAMBER FOUNDATION MATERIALS BEARING CAPACITIES TO THE SITE DESIGNENGINEER.11.ADS RECOMMENDS THE USE OF "FLEXSTORM CATCH IT" INSERTS DURING CONSTRUCTION FOR ALL INLETS TO PROTECT THE SUBSURFACESTORMWATER MANAGEMENT SYSTEM FROM CONSTRUCTION SITE RUNOFF.NOTES FOR CONSTRUCTION EQUIPMENT1.STORMTECH MC-3500 CHAMBERS SHALL BE INSTALLED IN ACCORDANCE WITH THE "STORMTECH MC-3500/MC-4500 CONSTRUCTION GUIDE".2.THE USE OF EQUIPMENT OVER MC-3500 CHAMBERS IS LIMITED:·NO EQUIPMENT IS ALLOWED ON BARE CHAMBERS.·NO RUBBER TIRED LOADER, DUMP TRUCK, OR EXCAVATORS ARE ALLOWED UNTIL PROPER FILL DEPTHS ARE REACHED IN ACCORDANCEWITH THE "STORMTECH MC-3500/MC-4500 CONSTRUCTION GUIDE".·WEIGHT LIMITS FOR CONSTRUCTION EQUIPMENT CAN BE FOUND IN THE "STORMTECH MC-3500/MC-4500 CONSTRUCTION GUIDE".3.FULL 36" (900 mm) OF STABILIZED COVER MATERIALS OVER THE CHAMBERS IS REQUIRED FOR DUMP TRUCK TRAVEL OR DUMPING.USE OF A DOZER TO PUSH EMBEDMENT STONE BETWEEN THE ROWS OF CHAMBERS MAY CAUSE DAMAGE TO CHAMBERS AND IS NOT AN ACCEPTABLEBACKFILL METHOD. ANY CHAMBERS DAMAGED BY USING THE "DUMP AND PUSH" METHOD ARE NOT COVERED UNDER THE STORMTECH STANDARDWARRANTY.CONTACT STORMTECH AT 1-888-892-2694 WITH ANY QUESTIONS ON INSTALLATION REQUIREMENTS OR WEIGHT LIMITS FOR CONSTRUCTION EQUIPMENT. 6" (150 mm)
FOR STORMTECHINSTALLATION INSTRUCTIONSVISIT OUR APPSiteAssist DATEDRWNCHKDDESCRIPTION0010'20'
SHEETOF DATE:PROJECT #:DRAWN:CHECKED:THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THEULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.4640 TRUEMAN BLVDHILLIARD, OH 43026 26 6/30/22S191661BMWXXX COSTO WHOLESALECULVER CITY, CAStormTechChamber System888-892-2694 | WWW.STORMTECH.COM® NOTES·MANIFOLD SIZE TO BE DETERMINED BY SITE DESIGN ENGINEER. SEE TECHNICAL NOTE 6.32 FOR MANIFOLD SIZING GUIDANCE.·DUE TO THE ADAPTATION OF THIS CHAMBER SYSTEM TO SPECIFIC SITE AND DESIGN CONSTRAINTS, IT MAY BE NECESSARY TO CUT AND COUPLE ADDITIONAL PIPE TO STANDARD MANIFOLDCOMPONENTS IN THE FIELD.·THE SITE DESIGN ENGINEER MUST REVIEW ELEVATIONS AND IF NECESSARY ADJUST GRADING TO ENSURE THE CHAMBER COVER REQUIREMENTS ARE MET.·THIS CHAMBER SYSTEM WAS DESIGNED WITHOUT SITE-SPECIFIC INFORMATION ON SOIL CONDITIONS OR BEARING CAPACITY. THE SITE DESIGN ENGINEER IS RESPONSIBLE FOR DETERMINING THESUITABILITY OF THE SOIL AND PROVIDING THE BEARING CAPACITY OF THE INSITU SOILS. THE BASE STONE DEPTH MAY BE INCREASED OR DECREASED ONCE THIS INFORMATION IS PROVIDED.·ADS DOES NOT DESIGN OR PROVIDE MEMBRANE LINER SYSTEMS FOR CISTERNS (RAINWATER HARVESTING). TO MINIMIZE THE LEAKAGE POTENTIAL OF LINER SYSTEMS, THE MEMBRANE LINER SYSTEMSHOULD BE DESIGNED BY A KNOWLEDGEABLE GEOTEXTILE PROFESSIONAL AND INSTALLED BY A QUALIFIED CONTRACTOR.·NOT FOR CONSTRUCTION: THIS LAYOUT IS FOR DIMENSIONAL PURPOSES ONLY TO PROVE CONCEPT & THE REQUIRED STORAGE VOLUME CAN BE ACHIEVED ON SITE. 12" ADS N-12 BOTTOM CONNECTIONINVERT 1.35" ABOVE CHAMBER BASE(SEE NOTES)12" X 12" ADS N-12 TOP MANIFOLDINVERT 26.36VE CHAMBER BASE(SEE NOTES)6" ADS N-12 DUAL WALL PERFORATEDHDPE UNDERDRAIN(SIZE TBD BY ENGINEER / SOLID OUTSIDEPERIMETER STONE) INSPECTION PORTPROPOSED 30" NYLOPLAST BASINW/ELEVATED BYPASS MANIFOLDMAXIMUM INLET FLOW 2.4 CFS(24" SUMP MIN)ISOLATOR ROW PLUS(SEE DETAIL)OUTLET STRUCTURE PER PLANSHOWN AS 30" NYLOPLAST BASINMAXIMUM OUTLET FLOW 2.0 CFS(DESIGN BY ENGINEER) PLACE MINIMUM 17.5' OF ADSPLUS175 WOVEN GEOTEXTILEOVER BEDDING STONE AND UNDERNEATH CHAMBER FEETFOR SCOUR PROTECTION AT ALL CHAMBER INLET ROWS 24" PARTIAL CUT END CAP, PART# MC3500IEPP24BC OR MC3500IEPP24BWTYP OF ALL MC-3500 24" BOTTOM CONNECTIONS AND ISOLATOR PLUS ROWS CONCEPTUAL LAYOUT16STORMTECH MC-3500 CHAMBERS4STORMTECH MC-3500 END CAPS12STONE ABOVE (in)9STONE BELOW (in)40% STONE VOID3,562INSTALLED SYSTEM VOLUME (CF) (PERIMETER STONE INCLUDED)1123SYSTEM AREA (ft²)170SYSTEM PERIMETER (ft)CONCEPTUAL ELEVATIONS12.50MAXIMUM ALLOWABLE GRADE (TOP OF PAVEMENT/UNPAVED)6.50MINIMUM ALLOWABLE GRADE (UNPAVED WITH TRAFFIC)6.00MINIMUM ALLOWABLE GRADE (UNPAVED NO TRAFFIC)6.00MINIMUM ALLOWABLE GRADE (BASE OF FLEXIBLE PAVEMENT)6.00MINIMUM ALLOWABLE GRADE (TOP OF RIGID PAVEMENT)5.50TOP OF STONE4.50TOP OF MC-3500 CHAMBER2.9512" TOP MANIFOLD INVERT0.9224" ISOLATOR ROW PLUS CONNECTION INVERT0.8612" BOTTOM CONNECTION INVERT0.75BOTTOM OF MC-3500 CHAMBER0.00UNDERDRAIN INVERT0.00BOTTOM OF STONE INSTALL FLAMP ON 24" ACCESS PIPEPART# MC350024RAMP68.77'61.10'

16.33'13.33'THERMOPLASTIC LINER(SEE TECHNICAL NOTE 6.50 / PROVIDED BY OTHERS /DESIGN BY OTHERS) SHEETOF DATE:PROJECT #:DRAWN:CHECKED:THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THEULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.4640 TRUEMAN BLVDHILLIARD, OH 43026 36 6/30/22S191661BMWXXX COSTO WHOLESALECULVER CITY, CADATEDRWNCHKDDESCRIPTION ACCEPTABLE FILL MATERIALS: STORMTECH MC-3500 CHAMBER SYSTEMS PLEASE NOTE:1.THE LISTED AASHTO DESIGNATIONS ARE FOR GRADATIONS ONLY. THE STONE MUST ALSO BE CLEAN, CRUSHED, ANGULAR. FOR EXAMPLE, A SPECIFICATION FOR #4 STONE WOULD STATE: "CLEAN, CRUSHED, ANGULAR NO. 4 (AASHTO M43) STONE".2.STORMTECH COMPACTION REQUIREMENTS ARE MET FOR 'A' LOCATION MATERIALS WHEN PLACED AND COMPACTED IN 9" (230 mm) (MAX) LIFTS USING TWO FULL COVERAGES WITH A VIBRATORY COMPACTOR.3.WHERE INFILTRATION SURFACES MAY BE COMPROMISED BY COMPACTION, FOR STANDARD DESIGN LOAD CONDITIONS, A FLAT SURFACE MAY BE ACHIEVED BY RAKING OR DRAGGING WITHOUT COMPACTION EQUIPMENT. FOR SPECIAL LOAD DESIGNS, CONTACT STORMTECH FORCOMPACTION REQUIREMENTS.4.ONCE LAYER 'C' IS PLACED, ANY SOIL/MATERIAL CAN BE PLACED IN LAYER 'D' UP TO THE FINISHED GRADE. MOST PAVEMENT SUBBASE SOILS CAN BE USED TO REPLACE THE MATERIAL REQUIREMENTS OF LAYER 'C' OR 'D' AT THE SITE DESIGN ENGINEER'S DISCRETION.

NOTES:1.CHAMBERS SHALL MEET THE REQUIREMENTS OF ASTM F2418, "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS"CHAMBER CLASSIFICATION 45x76 DESIGNATION SS.2.MC-3500 CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITH ASTM F2787 "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".3.THE SITE DESIGN ENGINEER IS RESPONSIBLE FOR ASSESSING THE BEARING RESISTANCE (ALLOWABLE BEARING CAPACITY) OF THE SUBGRADE SOILS AND THE DEPTH OF FOUNDATION STONE WITH CONSIDERATIONFOR THE RANGE OF EXPECTED SOIL MOISTURE CONDITIONS.4.PERIMETER STONE MUST BE EXTENDED HORIZONTALLY TO THE EXCAVATION WALL FOR BOTH VERTICAL AND SLOPED EXCAVATION WALLS.5.REQUIREMENTS FOR HANDLING AND INSTALLATION:·TO MAINTAIN THE WIDTH OF CHAMBERS DURING SHIPPING AND HANDLING, CHAMBERS SHALL HAVE INTEGRAL, INTERLOCKING STACKING LUGS.·TO ENSURE A SECURE JOINT DURING INSTALLATION AND BACKFILL, THE HEIGHT OF THE CHAMBER JOINT SHALL NOT BE LESS THAN 3”.·TO ENSURE THE INTEGRITY OF THE ARCH SHAPE DURING INSTALLATION, a) THE ARCH STIFFNESS CONSTANT AS DEFINED IN SECTION 6.2.8 OF ASTM F2418 SHALL BE GREATER THAN OR EQUAL TO 500 LBS/FT/%.AND b) TO RESIST CHAMBER DEFORMATION DURING INSTALLATION AT ELEVATED TEMPERATURES (ABOVE 73° F / 23° C), CHAMBERS SHALL BE PRODUCED FROM REFLECTIVE GOLD OR YELLOW COLORS.

MATERIAL LOCATIONDESCRIPTIONAASHTO MATERIALCLASSIFICATIONSCOMPACTION / DENSITY REQUIREMENTDFINAL FILL: FILL MATERIAL FOR LAYER 'D' STARTS FROM THETOP OF THE 'C' LAYER TO THE BOTTOM OF FLEXIBLEPAVEMENT OR UNPAVED FINISHED GRADE ABOVE. NOTE THATPAVEMENT SUBBASE MAY BE PART OF THE 'D' LAYERANY SOIL/ROCK MATERIALS, NATIVE SOILS, OR PER ENGINEER'S PLANS.CHECK PLANS FOR PAVEMENT SUBGRADE REQUIREMENTS.N/APREPARE PER SITE DESIGN ENGINEER'S PLANS. PAVEDINSTALLATIONS MAY HAVE STRINGENT MATERIAL ANDPREPARATION REQUIREMENTS.CINITIAL FILL: FILL MATERIAL FOR LAYER 'C' STARTS FROM THETOP OF THE EMBEDMENT STONE ('B' LAYER) TO 24" (600 mm)ABOVE THE TOP OF THE CHAMBER. NOTE THAT PAVEMENTSUBBASE MAY BE A PART OF THE 'C' LAYER.GRANULAR WELL-GRADED SOIL/AGGREGATE MIXTURES, <35% FINES ORPROCESSED AGGREGATE. MOST PAVEMENT SUBBASE MATERIALS CAN BE USED IN LIEU OF THISLAYER.AASHTO M145¹A-1, A-2-4, A-3ORAASHTO M43¹3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10BEGIN COMPACTIONS AFTER 24" (600 mm) OF MATERIAL OVERTHE CHAMBERS IS REACHED. COMPACT ADDITIONAL LAYERS IN12" (300 mm) MAX LIFTS TO A MIN. 95% PROCTOR DENSITY FORWELL GRADED MATERIAL AND 95% RELATIVE DENSITY FORPROCESSED AGGREGATE MATERIALS.BEMBEDMENT STONE: FILL SURROUNDING THE CHAMBERSFROM THE FOUNDATION STONE ('A' LAYER) TO THE 'C' LAYERABOVE.CLEAN, CRUSHED, ANGULAR STONEAASHTO M43¹3, 4AFOUNDATION STONE: FILL BELOW CHAMBERS FROM THESUBGRADE UP TO THE FOOT (BOTTOM) OF THE CHAMBER.CLEAN, CRUSHED, ANGULAR STONEAASHTO M43¹3, 4PLATE COMPACT OR ROLL TO ACHIEVE A FLAT SURFACE.2,3NO COMPACTION REQUIRED. 8'(2.4 m)MAX
12" (300 mm) MIN77" (1956 mm)
12" (300 mm) MIN
6"(150 mm) MIN6" (150 mm) MIN
PERIMETER STONE(SEE NOTE 4)
MC-3500END CAPSUBGRADE SOILS(SEE NOTE 3)DEPTH OF STONE TO BE DETERMINEDBY SITE DESIGN ENGINEER 9" (230 mm) MIN DCBA
*TO BOTTOM OF FLEXIBLE PAVEMENT. FOR UNPAVEDINSTALLATIONS WHERE RUTTING FROM VEHICLES MAY OCCUR,INCREASE COVER TO 24" (600 mm).1 LAYER OF ADS GEOSYNTHETICS NON-WOVEN GEOTEXTILE ON BOTH SIDES OFTHERMOPLASTIC LINER ALL AROUND CLEAN, CRUSHED, ANGULAR STONE IN A & B LAYERS.SEE ADS TECHNICAL NOTE 6.50 FOR NON-WOVEN WEIGHT RECOMMENDATIONS.45"(1143 mm)18" (450 mm)MIN*1 LAYER OF ADS GEOSYNTHETICS NON-WOVEN GEOTEXTILE BETWEEN COVER STONE AND C LAYER.

EXCAVATION WALL(CAN BE SLOPED OR VERTICAL)

THERMOPLASTIC LINER DETAILNON-WOVENGEOTEXTILEEARTHTHERMOPLASTICLINER

OVERLAP ON TOPSEVERAL INCHESTO ANCHOR (PERMANUFACTURER'SRECOMMENDATIONS)ANGULARSTONENON-WOVENGEOTEXTILE **THIS CROSS SECTION DETAIL REPRESENTSMINIMUM REQUIREMENTS FOR INSTALLATION.PLEASE SEE THE LAYOUT SHEET(S) FORPROJECT SPECIFIC REQUIREMENTS.

StormTechChamber System888-892-2694 | WWW.STORMTECH.COM® SHEETOF DATE:PROJECT #:DRAWN:CHECKED:THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THEULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.4640 TRUEMAN BLVDHILLIARD, OH 43026 46 6/30/22S191661BMWXXX COSTO WHOLESALECULVER CITY, CADATEDRWNCHKDDESCRIPTION INSPECTION & MAINTENANCESTEP 1)INSPECT ISOLATOR ROW PLUS FOR SEDIMENTA.INSPECTION PORTS (IF PRESENT)A.1.REMOVE/OPEN LID ON NYLOPLAST INLINE DRAINA.2.REMOVE AND CLEAN FLEXSTORM FILTER IF INSTALLEDA.3.USING A FLASHLIGHT AND STADIA ROD, MEASURE DEPTH OF SEDIMENT AND RECORD ON MAINTENANCE LOGA.4.LOWER A CAMERA INTO ISOLATOR ROW PLUS FOR VISUAL INSPECTION OF SEDIMENT LEVELS (OPTIONAL)A.5.IF SEDIMENT IS AT, OR ABOVE, 3" (80 mm) PROCEED TO STEP 2. IF NOT, PROCEED TO STEP 3.B.ALL ISOLATOR PLUS ROWSB.1.REMOVE COVER FROM STRUCTURE AT UPSTREAM END OF ISOLATOR ROW PLUSB.2.USING A FLASHLIGHT, INSPECT DOWN THE ISOLATOR ROW PLUS THROUGH OUTLET PIPEi)MIRRORS ON POLES OR CAMERAS MAY BE USED TO AVOID A CONFINED SPACE ENTRYii)FOLLOW OSHA REGULATIONS FOR CONFINED SPACE ENTRY IF ENTERING MANHOLEB.3.IF SEDIMENT IS AT, OR ABOVE, 3" (80 mm) PROCEED TO STEP 2. IF NOT, PROCEED TO STEP 3.STEP 2)CLEAN OUT ISOLATOR ROW PLUS USING THE JETVAC PROCESSA.A FIXED CULVERT CLEANING NOZZLE WITH REAR FACING SPREAD OF 45" (1.1 m) OR MORE IS PREFERREDB.APPLY MULTIPLE PASSES OF JETVAC UNTIL BACKFLUSH WATER IS CLEANC.VACUUM STRUCTURE SUMP AS REQUIREDSTEP 3)REPLACE ALL COVERS, GRATES, FILTERS, AND LIDS; RECORD OBSERVATIONS AND ACTIONS.STEP 4)INSPECT AND CLEAN BASINS AND MANHOLES UPSTREAM OF THE STORMTECH SYSTEM.NOTES1.INSPECT EVERY 6 MONTHS DURING THE FIRST YEAR OF OPERATION. ADJUST THE INSPECTION INTERVAL BASED ON PREVIOUSOBSERVATIONS OF SEDIMENT ACCUMULATION AND HIGH WATER ELEVATIONS.2.CONDUCT JETTING AND VACTORING ANNUALLY OR WHEN INSPECTION SHOWS THAT MAINTENANCE IS NECESSARY. 24" (600 mm) HDPE ACCESS PIPE REQUIREDUSE FACTORY PARTIAL CUT END CAP PART #:MC3500IEPP24BC OR MC3500IEPP24BWONE LAYER OF ADSPLUS175 WOVEN GEOTEXTILE BETWEENFOUNDATION STONE AND CHAMBERS8.25' (2.51 m) MIN WIDE CONTINUOUS FABRIC WITHOUT SEAMS COVER PIPE CONNECTION TO ENDCAP WITH ADS GEOSYNTHETICS 601TNON-WOVEN GEOTEXTILEMC-3500 CHAMBERMC-3500 END CAP MC-3500 ISOLATOR ROW PLUS DETAILNTS

OPTIONAL INSPECTION PORTSTORMTECH HIGHLY RECOMMENDSFLEXSTORM INSERTS IN ANY UPSTREAMSTRUCTURES WITH OPEN GRATESELEVATED BYPASS MANIFOLD INSTALL FLAMP ON 24" (600 mm) ACCESS PIPEPART #: MC350024RAMP SUMP DEPTH TBD BYSITE DESIGN ENGINEER(24" [600 mm] MIN RECOMMENDED)NYLOPLAST NOTE:INSPECTION PORTS MAY BE CONNECTED THROUGH ANY CHAMBER CORRUGATION VALLEY.

STORMTECH CHAMBER
CONCRETE COLLARPAVEMENT12" (300 mm) MIN WIDTHCONCRETE SLAB6" (150 mm) MIN THICKNESS 4" PVC INSPECTION PORT DETAIL(MC SERIES CHAMBER)NTS
8" NYLOPLAST INSPECTION PORTBODY (PART# 2708AG4IPKIT) ORTRAFFIC RATED BOX W/SOLIDLOCKING COVERCONCRETE COLLAR NOT REQUIREDFOR UNPAVED APPLICATIONS4" (100 mm)SDR 35 PIPE4" (100 mm) INSERTA TEETO BE CENTERED ONCORRUGATION VALLEY StormTechChamber System888-892-2694 | WWW.STORMTECH.COM® SHEETOF DATE:PROJECT #:DRAWN:CHECKED:THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THEULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.4640 TRUEMAN BLVDHILLIARD, OH 43026 56 6/30/22S191661BMWXXX COSTO WHOLESALECULVER CITY, CADATEDRWNCHKDDESCRIPTIONStormTechChamber System888-892-2694 | WWW.STORMTECH.COM®PART #STUBBCMC3500IEPP06T6" (150 mm)33.21" (844 mm)---MC3500IEPP06B---0.66" (17 mm)MC3500IEPP08T8" (200 mm)31.16" (791 mm)---MC3500IEPP08B---0.81" (21 mm)MC3500IEPP10T10" (250 mm)29.04" (738 mm)---MC3500IEPP10B---0.93" (24 mm)MC3500IEPP12T12" (300 mm)26.36" (670 mm)---MC3500IEPP12B---1.35" (34 mm)MC3500IEPP15T15" (375 mm)23.39" (594 mm)---MC3500IEPP15B---1.50" (38 mm)MC3500IEPP18TC18" (450 mm)20.03" (509 mm)---MC3500IEPP18TWMC3500IEPP18BC---1.77" (45 mm)MC3500IEPP18BWMC3500IEPP24TC24" (600 mm)14.48" (368 mm)---MC3500IEPP24TWMC3500IEPP24BC---2.06" (52 mm)MC3500IEPP24BWMC3500IEPP30BC30" (750 mm)---2.75" (70 mm) NOMINAL CHAMBER SPECIFICATIONSSIZE (W X H X INSTALLED LENGTH)77.0" X 45.0" X 86.0" (1956 mm X 1143 mm X 2184 mm)CHAMBER STORAGE109.9 CUBIC FEET (3.11 m³)MINIMUM INSTALLED STORAGE*175.0 CUBIC FEET (4.96 m³)WEIGHT134 lbs.(60.8 kg)NOMINAL END CAP SPECIFICATIONSSIZE (W X H X INSTALLED LENGTH)75.0" X 45.0" X 22.2" (1905 mm X 1143 mm X 564 mm)END CAP STORAGE14.9 CUBIC FEET (0.42 m³)MINIMUM INSTALLED STORAGE*45.1 CUBIC FEET (1.28 m³)WEIGHT49 lbs.(22.2 kg)*ASSUMES 12" (305 mm) STONE ABOVE, 9" (229 mm) STONE FOUNDATION, 6" (152 mm) STONEBETWEEN CHAMBERS, 6" (152 mm) STONE PERIMETER IN FRONT OF END CAPS AND 40% STONEPOROSITY.

MC-3500 TECHNICAL SPECIFICATIONNTS

90.0" (2286 mm)ACTUAL LENGTH

86.0" (2184 mm)INSTALLED

BUILD ROW IN THIS DIRECTION
NOTE: ALL DIMENSIONS ARE NOMINAL

LOWER JOINTCORRUGATIONWEBCRESTCRESTSTIFFENING RIBVALLEYSTIFFENING RIB BC

75.0"(1905 mm)45.0"(1143 mm)

25.7"(653 mm)
FOOT

77.0"(1956 mm)45.0"(1143 mm)
PARTIAL CUT HOLES AT BOTTOM OF END CAP FOR PART NUMBERS ENDING WITH "B"PARTIAL CUT HOLES AT TOP OF END CAP FOR PART NUMBERS ENDING WITH "T"END CAPS WITH A PREFABRICATED WELDED STUB END WITH "W"END CAPS WITH A WELDED CROWN PLATE END WITH "C" UPPER JOINT CORRUGATION22.2"(564 mm)INSTALLED
CUSTOM PARTIAL CUT INVERTS AREAVAILABLE UPON REQUEST.INVENTORIED MANIFOLDS INCLUDE12-24" (300-600 mm) SIZE ON SIZEAND 15-48" (375-1200 mm)ECCENTRIC MANIFOLDS. CUSTOMINVERT LOCATIONS ON THE MC-3500END CAP CUT IN THE FIELD ARE NOTRECOMMENDED FOR PIPE SIZESGREATER THAN 10" (250 mm). THEINVERT LOCATION IN COLUMN 'B'ARE THE HIGHEST POSSIBLE FORTHE PIPE SIZE.

MC-SERIES END CAP INSERTION DETAILNTS
NOTE: MANIFOLD STUB MUST BE LAID HORIZONTALFOR A PROPER FIT IN END CAP OPENING.12" (300 mm)MIN SEPARATION 12" (300 mm) MIN INSERTIONMANIFOLD HEADERMANIFOLD STUBSTORMTECH END CAP12" (300 mm)MIN SEPARATION 12" (300 mm)MIN INSERTIONMANIFOLD HEADERMANIFOLD STUB

UNDERDRAIN DETAILNTS

AABB SECTION A-A
SECTION B-BNUMBER AND SIZE OF UNDERDRAINS PER SITE DESIGN ENGINEER4" (100 mm) TYP FOR SC-310 & SC-160LP SYSTEMS6" (150 mm) TYP FOR SC-740, DC-780, MC-3500, MC-4500 & MC-7200 SYSTEMS

OUTLET MANIFOLDSTORMTECHEND CAPSTORMTECHCHAMBERSSTORMTECHCHAMBER

STORMTECHEND CAPDUAL WALLPERFORATEDHDPEUNDERDRAIN
ADS GEOSYNTHETICS 601TNON-WOVEN GEOTEXTILE
ADS GEOSYNTHETICS 601TNON-WOVEN GEOTEXTILEFOUNDATION STONEBENEATH CHAMBERS

FOUNDATION STONEBENEATH CHAMBERS
SHEETOF DATE:PROJECT #:DRAWN:CHECKED:THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THEULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.4640 TRUEMAN BLVDHILLIARD, OH 43026 66 6/30/22S191661BMWXXX COSTO WHOLESALECULVER CITY, CADATEDRWNCHKDDESCRIPTION TRAFFIC LOADS: CONCRETE DIMENSIONSARE FOR GUIDELINE PUPOSES ONLY.ACTUAL CONCRETE SLAB MUST BEDESIGNED GIVING CONSIDERATION FORLOCAL SOIL CONDITIONS, TRAFFICLOADING & OTHER APPLICABLE DESIGNFACTORSADAPTER ANGLES VARIABLE 0°- 360°ACCORDING TO PLANS A
18" (457 mm)MIN WIDTHAASHTO H-20 CONCRETE SLAB8" (203 mm) MIN THICKNESS VARIABLE SUMP DEPTHACCORDING TO PLANS[6" (152 mm) MIN ON 8-24" (200-600 mm),10" (254 mm) MIN ON 30" (750 mm)]4" (102 mm) MIN ON 8-24" (200-600 mm)6" (152 mm) MIN ON 30" (750 mm) 12" (610 mm) MIN(FOR AASHTO H-20)INVERT ACCORDING TOPLANS/TAKE OFF BACKFILL MATERIAL BELOW AND TO SIDESOF STRUCTURE SHALL BE ASTM D2321CLASS I OR II CRUSHED STONE OR GRAVELAND BE PLACED UNIFORMLY IN 12" (305 mm)LIFTS AND COMPACTED TO MIN OF 90% INTEGRATED DUCTILE IRONFRAME & GRATE/SOLID TOMATCH BASIN O.D.NYLOPLAST DRAIN BASINNTS NOTES1.8-30" (200-750 mm) GRATES/SOLID COVERS SHALL BE DUCTILE IRON PER ASTM A536GRADE 70-50-052.12-30" (300-750 mm) FRAMES SHALL BE DUCTILE IRON PER ASTM A536 GRADE 70-50-053.DRAIN BASIN TO BE CUSTOM MANUFACTURED ACCORDING TO PLAN DETAILS4.DRAINAGE CONNECTION STUB JOINT TIGHTNESS SHALL CONFORM TO ASTM D3212FOR CORRUGATED HDPE (ADS & HANCOR DUAL WALL) & SDR 35 PVC5.FOR COMPLETE DESIGN AND PRODUCT INFORMATION: WWW.NYLOPLAST-US.COM6.TO ORDER CALL: 800-821-6710APART #GRATE/SOLID COVER OPTIONS8"(200 mm)2808AGPEDESTRIAN LIGHTDUTYSTANDARD LIGHTDUTYSOLID LIGHT DUTY10"(250 mm)2810AGPEDESTRIAN LIGHTDUTYSTANDARD LIGHTDUTYSOLID LIGHT DUTY12"(300 mm)2812AGPEDESTRIANAASHTO H-10STANDARD AASHTOH-20SOLIDAASHTO H-2015"(375 mm)2815AGPEDESTRIANAASHTO H-10STANDARD AASHTOH-20SOLIDAASHTO H-2018"(450 mm)2818AGPEDESTRIANAASHTO H-10STANDARD AASHTOH-20SOLIDAASHTO H-2024"(600 mm)2824AGPEDESTRIANAASHTO H-10STANDARD AASHTOH-20SOLIDAASHTO H-2030"(750 mm)2830AGPEDESTRIANAASHTO H-20STANDARD AASHTOH-20SOLIDAASHTO H-20 VARIOUS TYPES OF INLET ANDOUTLET ADAPTERS AVAILABLE:4-30" (100-750 mm) FORCORRUGATED HDPEWATERTIGHT JOINT(CORRUGATED HDPE SHOWN) Nyloplast770-932-2443 | WWW.NYLOPLAST-US.COM®

Project:

Chamber Model - MC-3500
Units - Imperial
Number of Chambers - 16
Number of End Caps - 4
Voids in the stone (porosity) - 40 %
Base of Stone Elevation - 0.00 ft
Amount of Stone Above Chambers - 12 in
Amount of Stone Below Chambers - 9 in
Amount of Stone Between Chambers - 6 in
Area of system - 1123 sf Min. Area -
Height of
System
Incremental Single
Chamber
Incremental
Single End Cap
Incremental
Chambers
Incremental
End Cap
Incremental
Stone
Incremental Ch,
EC and Stone
Cumulative
System Elevation 1
(inches) (cubic feet) (cubic feet) (cubic feet) (cubic feet) (cubic feet) (cubic feet) (cubic feet) (feet) 66 0.00 0.00 0.00 0.00 37.43 37.43 3561.99 5.50
65 0.00 0.00 0.00 0.00 37.43 37.43 3524.55 5.42
64 0.00 0.00 0.00 0.00 37.43 37.43 3487.12 5.33
0cf above elevation
63 0.00 0.00 0.00 0.00 37.43 37.43 3449.69 5.25 0cf below elevation 62 0.00 0.00 0.00 0.00 37.43 37.43 3412.25 5.17 0cf above elevation 61 0.00 0.00 0.00 0.00 37.43 37.43 3374.82 5.08 0cf below elevation 60 0.00 0.00 0.00 0.00 37.43 37.43 3337.39 5.00 3561.99cf between elevations and 5.5 59 0.00 0.00 0.00 0.00 37.43 37.43 3299.95 4.92
58 0.00 0.00 0.00 0.00 37.43 37.43 3262.52 4.83
57 0.00 0.00 0.00 0.00 37.43 37.43 3225.09 4.75
WQ Volume: cf
56 0.00 0.00 0.00 0.00 37.43 37.43 3187.65 4.67 0cf below elevation 55 0.00 0.00 0.00 0.00 37.43 37.43 3150.22 4.58
54 0.06 0.00 0.93 0.00 37.06 37.99 3112.79 4.50
53 0.19 0.02 3.11 0.10 36.15 39.35 3074.80 4.42
WQv achieved at elevation:
52 0.29 0.04 4.70 0.15 35.49 40.35 3035.44 4.33
51 0.40 0.05 6.46 0.21 34.77 41.43 2995.10 4.25
50 0.69 0.07 10.99 0.27 32.93 44.19 2953.66 4.17
49 1.03 0.09 16.45 0.35 30.71 47.52 2909.47 4.08
48 1.25 0.11 19.99 0.43 29.26 49.69 2861.96 4.00
47 1.42 0.13 22.76 0.51 28.13 51.39 2812.27 3.92
46 1.57 0.14 25.17 0.58 27.13 52.88 2760.88 3.83
45 1.71 0.16 27.31 0.65 26.25 54.21 2708.00 3.75
44 1.83 0.18 29.26 0.73 25.44 55.42 2653.78 3.67
43 1.94 0.20 31.00 0.80 24.71 56.52 2598.36 3.58
42 2.04 0.22 32.65 0.87 24.02 57.55 2541.84 3.50
41 2.13 0.23 34.16 0.94 23.40 58.49 2484.30 3.42
40 2.22 0.25 35.59 1.00 22.80 59.39 2425.81 3.33
39 2.31 0.27 36.91 1.06 22.24 60.22 2366.42 3.25
38 2.38 0.28 38.16 1.12 21.72 61.00 2306.20 3.17
37 2.46 0.29 39.35 1.18 21.22 61.75 2245.20 3.08
36 2.53 0.31 40.45 1.23 20.76 62.44 2183.46 3.00
35 2.59 0.32 41.50 1.28 20.32 63.10 2121.01 2.92
34 2.66 0.33 42.50 1.34 19.90 63.73 2057.91 2.83
33 2.72 0.35 43.44 1.39 19.50 64.33 1994.18 2.75
32 2.77 0.36 44.34 1.44 19.12 64.90 1929.85 2.67
31 2.82 0.37 45.19 1.49 18.76 65.44 1864.94 2.58
30 2.88 0.38 46.01 1.54 18.42 65.96 1799.50 2.50
29 2.92 0.40 46.79 1.58 18.09 66.46 1733.54 2.42
28 2.97 0.41 47.52 1.63 17.77 66.92 1667.08 2.33
27 3.01 0.42 48.20 1.67 17.48 67.36 1600.16 2.25
26 3.05 0.43 48.85 1.72 17.21 67.78 1532.80 2.17
25 3.09 0.44 49.51 1.76 16.93 68.20 1465.03 2.08
24 3.13 0.45 50.09 1.80 16.68 68.57 1396.83 2.00
23 3.17 0.46 50.65 1.84 16.44 68.93 1328.26 1.92
22 3.20 0.47 51.19 1.88 16.20 69.28 1259.33 1.83
21 3.23 0.48 51.70 1.92 15.99 69.60 1190.06 1.75
20 3.26 0.49 52.18 1.96 15.78 69.92 1120.45 1.67
19 3.29 0.50 52.64 1.99 15.58 70.21 1050.54 1.58
18 3.32 0.51 53.09 2.03 15.39 70.50 980.32 1.50
17 3.34 0.51 53.51 2.06 15.21 70.77 909.82 1.42
16 3.37 0.52 53.90 2.09 15.04 71.03 839.05 1.33
15 3.39 0.53 54.28 2.12 14.87 71.27 768.02 1.25
14 3.41 0.54 54.63 2.15 14.72 71.50 696.75 1.17
13 3.44 0.54 54.99 2.17 14.57 71.73 625.25 1.08
12 3.46 0.55 55.32 2.20 14.42 71.95 553.52 1.00
11 3.48 0.56 55.66 2.22 14.28 72.16 481.57 0.92
10 3.51 0.59 56.08 2.38 14.05 72.51 409.41 0.83
9 0.00 0.00 0.00 0.00 37.43 37.43 336.90 0.75
8 0.00 0.00 0.00 0.00 37.43 37.43 299.47 0.67
7 0.00 0.00 0.00 0.00 37.43 37.43 262.03 0.58
6 0.00 0.00 0.00 0.00 37.43 37.43 224.60 0.50
5 0.00 0.00 0.00 0.00 37.43 37.43 187.17 0.42
4 0.00 0.00 0.00 0.00 37.43 37.43 149.73 0.33
3 0.00 0.00 0.00 0.00 37.43 37.43 112.30 0.25
2 0.00 0.00 0.00 0.00 37.43 37.43 74.87 0.17
1 0.00 0.00 0.00 0.00 37.43 37.43 37.43 0.08
StormTech MC-3500 Cumulative Storage Volumes
Costco Wholesale
858 sf min. area
Include Perimeter Stone in Calculations
Click Here for Metric

HYDROLOGY /MS 4 STUDY
GAS STATION RELOCATION - COSTCO CULVER CITY M AY 2024

COSTCO WHOLESALE

APPENDIX G

Stormwater and Urban Run -Off
Diversion System Agreement

Attachment 5

Limited Phase II Environmental Site Assessment
13431 and 13455 Washington Boulevard
Culver City Gasoline Station Relocation prepared by Kleinfelder, dated December 1, 2021 (Attached)

20201678.001A/LH21L133665 Page 1 of 2 December 1, 2 021 Copyright 2021 Kleinfelder

24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242

December 1, 2021
Kleinfelder Project No.: 20201678.001A

Costco Wholesale Corporation
999 Lake Drive
Issaquah, Washington 98027

Attention: Ms. Therese Garcia
Real Estate Project Manager

Subject: Limited Phase II Environmental Site Assessment Findings Summary (Baseline Assessment)
Proposed Gasoline Station Relocation
Costco Wholesale Warehouse No. 479
13463 Washington Boulevard
Culver City, California 90292
CW# 19-0234

Dear Ms. Garcia:

Kleinfelder is pleased to provide Costco Wholesale Corporation (Costco) this letter summarizing findings of Kleinfelder’s Limited Phase II Environm ental Site Assessment (ESA) of the subject property (Site) at 13431 and 13455 Washington Boule vard in Culver City, California (Figure 1).

As Costco is aware, the Site is currently developed with two commercial buildings and parking lots serving them. It adjoins Costco’s Warehouse No. 479 facility, of which the southwestern-most portion is considered part of the Site. Costco plan s to demolish the Site’s existing buildings and relocate its gasoline station there. As such, Kleinfelder’s ESA was intended to serve as a baseline assessment of current subsurface environmental conditions at the Site prior to demolition of the existing improvements and construction of the gasol ine station facility there. The scope, methodology, and analytical results of the ESA are reported in detail in Kleinfelder’s letter to Costco dated October 14, 2021.
1 In summary, the field activities of the Limited Pha se II ESA were performed during September 2021 and included soil, groundwater, and soil vapor sampling at the Site. Multi-depth soil sampling was performed by Kleinfelder (with th e assistance of its drilling subcontractor) at four locations within the proposed footprint of the gasoline station, including proposed locations of dispenser islands and the cavity for the station ’s underground storage tanks. Soil vapor and groundwater sampling were in addition performed at each of those four locations plus at one central location on the Site. Kleinfelder’s soil, s oil vapor, and groundwater samples collected on behalf of Costco were submitted for analysis to a s ubcontracted laboratory accredited by California’s Environmental Laboratory Accreditation Program. The laboratory analyzed the soil and groundwater samples using appropriate United St ates Environmental Protection Agency

1 Kleinfelder, 2021. Letter with subject “Limited P hase II Environmental Site Assessment (Baseline Assessment), Proposed Gasoline Station Re location, Costco Wholesale Warehouse No. 479, 13463 Washington Boulevard, Culver City, California 90292, CW# 19-0234.” October 14. 20201678.001A/LH21L133665 Page 2 of 2 December 1, 2 021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 methodology for the following potential constituents of concern: total petroleum hydrocarbons in the gasoline, diesel, and motor oil carbon ranges; volatile organic compounds (VOCs); and California Code of Regulations Title 22 Metals. The soil vapor samples were analyzed for VOCs.

As is further detailed in the afore-mentioned lette r report dated October 14, 2021, Kleinfelder’s evaluation of the analytical results indicated none of the analytes were present at concentrations exceeding respective hazardous waste thresholds, no r respective regulatory agency-issued action levels. Based on its evaluations, Kleinfelder concluded no further assessment of Site soil, groundwater, or soil vapor is presently warranted.

LIMITATIONS

Kleinfelder prepared this letter in accordance with generally accepted standards of care that exist in Los Angeles County, California at this time. Thi s letter may be used only by Costco and only for the purposes stated, within a reasonable time f rom its issuance but in no event later than 2 years from the letter’s date. All information gat hered by Kleinfelder is considered confidential and will be released only upon written authorizatio n of Costco or as required by law.

Notwithstanding this, non-commercial, educational, and scientific use of this letter by regulatory agencies is regarded as a “fair use” and not a violation of copyright. Non-compliance with any of these requirements by Costco, unless specifically agreed to in advance by Kleinfelder in writing, will release Kleinfelder from any liability resulti ng from the use of this letter by any unauthorized party, but only to the extent of any such non-compl iance by the Costco. Further limitations applicable hereto may be set forth in Kleinfelder’s written agreement with the Costco addressing the work summarized herein.

CLOSING REMARKS

If you have questions or comments regarding this le tter, please do not hesitate to contact Paolo Dizon, Kleinfelder’s Project Manager, at (949) 727-4466.

Sincerely,

KLEINFELDER, INC.

Herbert (Bert) A. Vogler III, PG Paolo Dizon
Principal Hydrogeologist Project Manager

20201678.001A/LH21L131771 Page 1 of 15 October 14, 2021 Copyright 2021 Kleinfelder

24411 Ridge Route Drive, Suite 225, Laguna Hills, California 92653 p | 949.727.4466 f | 949.727.9242

October 14, 2021
Kleinfelder Project No.: 20201678.001A

Costco Wholesale Corporation
999 Lake Drive
Issaquah, Washington 98027

Attention: Ms. Therese Garcia
Real Estate Project Manager

Subject: Limited Phase II Environmental Site Assessment (Baseline Assessment)
Proposed Gasoline Station Relocation
Costco Wholesale Warehouse No. 479
13463 Washington Boulevard
Culver City, California 90292
CW# 19-0234

Dear Ms. Garcia:

Kleinfelder is pleased to provide Costco Wholesale Corporation (Costco) this report of a Limited Phase II Environmental Site Assessment (ESA) of the subject property (Site) at 13431 and 13455 Washington Boulevard in Culver City, Californ ia (Figure 1). The Site, which is currently developed with two commercial buildings and parking lots, is situated adjacent to Costco’s Warehouse No. 479 facility, the southwestern-most portion of which is considered part of the Site.

Kleinfelder understands Costco plans to demolish th e existing buildings at the Site and relocate its gasoline station there. As such, Kleinfelder’s Limited Phase II ESA was intended to serve as a baseline assessment of current subsurface environmental conditions at the Site prior to demolition of the existing Site improvements and construction of the gasoline station facility.

The following sections of this letter describe the scope, methodology, and analytical results of the soil, groundwater, and soil vapor sampling performe d at the Site, and Kleinfelder’s evaluations and conclusions. In summary, based on results of the ESA, Kleinfelder concludes the following:

• Total petroleum hydrocarbons (TPH) and volatile or ganic compounds (VOCs) were present in sampled Site soil at concentrations belo w regulatory agency-issued human
health risk-based screening levels for the respecti ve analytes, although TPH in the gasoline carbon range (TPH-g) was present at trace concentrations between the method detection limit (MDL) and practical quantitation li mit (PQL) in some of the sampled soil.

Concentrations of metals in sampled Site soil are below regulatory agency-issued human health risk-based screening levels, except for arse nic. Kleinfelder’s evaluation of the arsenic concentrations in the soil samples collecte d at the Site indicated they are below the mean arsenic concentration for southern California. • TPH-g was present at trace concentrations in sampl ed Site groundwater, although TPH in the diesel carbon range (TPH-d) and TPH in the moto r oil carbon range (TPH-mo) were not present at concentrations at or above their respective MDL. VOC analytical results for 20201678.001A/LH21L131771 Page 2 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 Site groundwater indicated a presence of the VOCs c hloroform, chloromethane, and tetrachloroethylene (PCE) in one or more of the samples, although concentrations of each are below its respective Maximum Contaminant Level (MCL) for drinking water. Dissolved metals results for sampled groundwater indicated reported concentrations for each metal present other than thallium are below the MCL for t he respective metal, and Site groundwater is not used for potable water supply, s o the drinking water MCL for thallium is not directly applicable.
• Based on the soil and groundwater analytical resul ts, Kleinfelder anticipates that soil excavated at the Site and groundwater dewatered fro m the Site containing the analyte concentrations of the sampled soil and groundwater may be characterized as non-hazardous for the purpose of disposal. However, Kleinfelder recommends that Costco provide the analytical results discussed herein to the disposal facility (or facilities) selected for disposal to verify that it (or they) will meet facility-specific acceptance criteria. • Soil vapor analytical results indicated the VOC be nzene was present in three of four analyzed samples collected from approximately 5 fee t below ground surface (bgs) at concentrations above its commercial/industrial soil vapor screening level that is based on benzene’s California Environmental Protection Agenc y (Cal/EPA) Department of Toxic Substances Control (DTSC) modified screening level (DTSC-SL) for commercial/industrial air divided by the default attenuation factor (AF) of 0.03 that is recommended by the United States Environmental Protection Agency (US EPA) to address “near-source” exterior soil vapor attenuation to indoor air. Benzene is an arom atic hydrocarbon VOC that is a gasoline constituent. The soil vapor analytical results further indicated PCE, a chlorinated VOC historically used as a solvent, was present at concentrations above its soil vapor screening level based on its commercial/industrial air DTSC-SL in four of the five 15-foot bgs samples. Since the Site is proposed to be redeveloped with a Costco gasoline station that will have no structure intended for human occu pancy, the existing soil vapor conditions are not expected to adversely affect Costco’s workers and customers. • Based on the reviewed analytical results, no furth er assessment of soil, groundwater, or soil vapor is recommended.

BACKGROUND INFORMATION

The Site’s majority consists of a parcel of land, d esignated with Los Angeles County Assessor’s Parcel Number (APN) 4236029008, that is occupied by two commercial buildings, with addresses of 13431 and 13455 Washington Boulevard, and associated parking lots. The Site also includes the southwestern-most portion of the adjoining parc el to the north, designated with APN 4236029009, which is currently occupied by the existing Costco Warehouse facility. The Site portion of the Costco facility presently consists o f a portion of an asphalt concrete-surfaced parking lot, drive aisles, and associated landscaped planters. Kleinfelder understands Costco has purchased the Site parcel with APN 4236029008 in pr eparation of the relocation of its gasoline station there.

The Site was historically occupied by a racetrack in 1928 and by the southernmost portion of an industrial building from approximately 1963 to 1994. Various manufacturing companies, including McDonnell Douglas Aircraft Company, Hughes Helicopter, Trans Communications, and Amdahl, were identified to have occupied the Site or its im mediate vicinity. The industrial buildings at the Site and in its immediate vicinity were demolished in 1994. The existing Costco Warehouse and Costco gasoline station, which are respectively nor th and east of the Site, were developed in 2002.
20201678.001A/LH21L131771 Page 3 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 A previous investigation performed by Kleinfelder in 1996 of the entire city block that includes the Site and adjoining Costco facility indicated soil, soil vapor, and groundwater beneath the Site contained VOCs, including PCE, trichloroethylene (T CE), and toluene. In 2019, Kleinfelder performed a limited Phase II ESA 1 at the Site that included collecting limited soil samples and installing and sampling groundwater from one groundwater monitoring well installed at a location near the middle of the Site. Results of the investi gation indicated no VOCs were present at concentrations at or above respective laboratory re porting limits at the time and location of the sampling. However, the 2019 assessment was quite limited in that only one location was sampled, so Kleinfelder recommended additional assessment to collect baseline and waste characterization analytical data pertaining to the Site.

LIMITED PHASE II (BASELINE) ENVIRONMENTAL SITE ASSESSMENT ACTIVITIES

Kleinfelder’s ESA-related activities are discussed in detail in the following sections.

Health and Safety Plan Preparation

Prior to initiation of field activities, Kleinfelde r updated its Site-Specific Health and Safety Plan (HSP) containing information regarding potential ch emical and physical hazards, monitoring equipment, and contingency plans for potential emergencies that may arise during field activities.

The HSP was based on the general knowledge of chemical characteristics of materials expected to be present on the Site. Based on the field servi ces proposed and expected environmental conditions, it was assumed that Level D Protection (with personal protective equipment [PPE] including gloves, steel-toe rubber boots, hard hat, and eye protection) would be adequate for performing the field activities described herein. A s expected, a PPE upgrade was not required during the field work.

Bore Location Marking and Geophysical Utility Clearance

On September 2, 2021, Kleinfelder and its utility l ocating subcontractor, GeoVision Geophysical Services, marked the bore locations and buried util ity lines and other detectable subsurface features proximal to them. Additionally, Undergroun d Service Alert of Southern California (USASC) was contacted to assist in locating subsurface public utilities. Notification was provided to USASC a minimum of 48 hours (2 business days not including the day of notification) prior to initiating the intrusive environmental sampling activities.

Soil and Groundwater Sampling

On September 9 and 10, 2021, four soil bores, designated KB-1 through KB-4, were advanced at the Site. As Figure 2 shows, Bores KB-1 and KB-2 we re advanced adjacent to the northern and eastern sides of the Site’s western existing building, as its footprint presently occupies the location where the proposed gasoline station’s UST cavity is presently planned to be situated. The location of Bore KB-2 is in addition at the approximate west ern end of the proposed gasoline station’s planned southernmost dispenser island. Bore KB-3 was advanced in the southeastern portion of the Site at a location that is toward the eastern e nd of the proposed gasoline station’s

1 Kleinfelder, 2019. Letter with subject “Report of Environmental Research and Limited Phase II Environmental Site Assessment, 13431 and 13455 Wash ington Boulevard, Culver City Gasoline Station Relocation, Costco Wholesale Warehouse No. 479, 13463 Washington Boulevard, Culver City, California 90292, CW# 19-0234.” October 7.
20201678.001A/LH21L131771 Page 4 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 southernmost dispenser island. Bore KB-4 was advanc ed in the northeastern portion of the Site north of where the proposed gasoline station’s northernmost dispenser island is planned.

Each bore was initially advanced to an approximate depth of 5 feet below ground surface (bgs) using a hand auger as an additional utility clearan ce procedure, after which Kleinfelder’s drilling subcontractor, Cascade Drilling (Cascade) used a di rect push drill rig to advance the bore to its total depth of 25 feet bgs. Soil samples were colle cted at approximately 2.5 feet and 5 feet bgs during hand augering, and at approximate 5-foot dep th intervals, beginning at approximately 10 feet bgs, during direct-push drilling.

Soil samples from the hand-augered portion of each bore were obtained from the hand auger bucket and transferred into laboratory provided gla ss jars. Soil samples collected deeper than 5 feet bgs were collected in a direct-push stainles s steel sampler lined with poly-vinyl chloride (PVC) sample sleeves of up to 5 feet in length. Dur ing sampling, some of the soil from each sample was screened in the field for the presence o f total volatile organic vapors using a photo-ionization detector (PID) calibrated with a 1 00-part per million by volume (ppmv) hexane standard. Each soil sample was promptly labeled wit h pertinent information and placed into a (water) ice-chilled cooler for temporary storage. A portion of each soil sample being submitted for laboratory VOC analysis was preserved in the field pursuant to United States Environmental Protection Agency (US EPA) Method 5035 before being placed into the cooler.

Kleinfelder staff, under the supervision of a State of California-registered Professional Geologist, observed the sampled soil in the field, logged it i n accordance with Unified Soil Classification System visual-manual methods specified in ASTM Inte rnational’s Designation D 2488, and prepared a field lithologic log of the soil encountered. The PID readings obtained in the field were also recorded on the field log along with the visua l description of the soil. The bore logs are included in the Attachments.

After completion of soil sampling in each bore, an appropriate length of 0.75-inch outer diameter (OD) PVC casing with 5 feet of PVC factory-slotted screen attached to the bottom was placed into the bore to accommodate groundwater sampling.

On September 10, 2021, the depth to groundwater in each of the four bores was monitored, after which an effort was made to purge three saturated b ore volumes from each bore using the temporary well installed in the bore and 0.25-inch OD polyethylene tubing and a peristatic pump.

On September 13, 2021, Monitoring Well B-1 at the S ite was purged using a disposable bailer and sampled. Groundwater parameters were measured a fter each purge volume from each of the soil bores and the well, with the measured grou ndwater parameters including turbidity, temperature, specific conductance, pH, oxidation re duction potential (ORP), and dissolved oxygen (DO). Each groundwater sample was placed into laboratory-prepared sample containers containing preservatives appropriate for the intended analysis.

Investigation-derived waste (IDW), including soil a nd wash water, was placed in two 55-gallon Department of Transportation (DOT)-approved steel d rums. The drums were temporarily stored on Site pending receipt of the analytical results and disposal profiling.

Soil Vapor Probe Installation, Purging, and Sampling

Five soil vapor probes were installed at the Site on September 9 and 10, 2021, with Probes KVP-1
through KVP-4 installed in bores advanced adjacent to Bores KB-1 through KB-4, respectively, 20201678.001A/LH21L131771 Page 5 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 and Probe KVP-5 installed in a bore advanced adjace nt to Well B-1. Probes KVP-1, KVP-2, KVP-4, and KVP-5 are dual-nested probes, with their implants set at approximately 5 feet and 15 feet except Probe KVP-2’s shallow implant is set at approximately 4.5 bgs instead. Probe KVP-3 instead consists of two single-completion vap or probes installed in two separate bores, with a vapor implant installed at approximately 15 feet bgs in one bore and at approximately 5 feet bgs in the other bore.

Soil vapor probe installation and subsequent purging and sampling of the probes were performed pursuant to guidance for performing active soil vapor investigations issued jointly by the Cal/EPA’s DTSC, Los Angeles Regional Water Quality Control Board (LARWQCB), and San Francisco Bay Regional Water Quality Control Board (SFBRWQCB).
2 To construct Probe KVP-1, a vapor implant attached to the bottom of an appropriate length of

0.25-inch OD Nylaflow™ tubing was inserted through the drill rod into the bore and lowered to approximately 15.0 feet bgs. An appropriate amount of sand to surround the implant and extend from a few inches below it to a few inches above it was then poured into the annulus between the tubing and bore wall, creating a sand pack from app roximately 15.5 feet to 14.0 feet bgs. The sand pack was topped with a vertical thickness of approximately 0.5 foot of dry bentonite granules (extending from approximately 14.0 feet to 13.5 feet bgs), followed by hydrated bentonite granules (extending from approximately 13.5 feet to 6.5 feet bgs). Then, approximately 0.5 foot of dry bentonite (extending from approximately 6.5 feet to 6.0 feet bgs), followed by 0.5 foot of sand (extending from approximately 6.0 feet to 5.5 feet bgs) was placed in the annulus. Next, a second vapor implant was attached to an appropriate length of 0.25-inch OD Nylaflow™ tubing, placed into the bore, and lowered to an approximate depth of 5.0 feet bgs. Sand was then poured into the bore around the implant to create a sand pack e xtending from approximately 6.0 feet to

4.5 feet bgs, followed by dry bentonite chips (exte nding from approximately 4.5 feet to 4.0 feet bgs), and then hydrated bentonite chips (extending from approximately 4.0 feet bgs to the surface). The top approximate 0.5 foot of the bore was filled with sand. The tubing ends were capped and left extending slightly above the ground surface.

Probes KVP-2, KVP-4, and KVP-5 were constructed similarly, each with a vapor implant attached to the bottom of an adequate length of 0.25-inch OD Nylaflow™ tubing that was inserted through the drill rod into the bore and lowered to approxim ately 15.0 feet bgs. An appropriate amount of sand to surround the implant and extend from a few inches below it to above it (from approximately

15.5 feet to 14.0 feet bgs for Probe KVP-2, and from approximately 16.0 feet to 14.5 feet bgs for Probes KVP-4 and KVP-5) was then poured into the an nulus between the tubing and bore wall.

The sand pack was topped with a vertical thickness of approximately 0.5 foot of dry bentonite granules, followed by an approximate 0.5-foot thickness of hydrated bentonite granules, followed by Portland cement grout containing approximately 5 -percent bentonite by dry weight extending up to approximately 6.0 feet bgs. Next, the vapor implant for the shallow completion was attached to the bottom of an appropriate length of 0.25-inch OD Nylaflow™ tubing, inserted in the bore, and lowered into it. The implants for Probes KVP-4 and KVP-5 were set at approximately 5.0 feet bgs, whereas the implant for Probe KVP-2 was set at approximately 4.5 feet bgs. Sand was then placed around the shallow vapor implant to create a sand pack that extends from approximately

5.0 feet to 4.0 feet bgs for Probe KVP-2 and from approximately 5.5 feet to 4.5 feet bgs for Probes KVP-4 and KVP-5. The sand pack was topped with a vertical thickness of approximately 0.5 foot of dry bentonite granules, followed by a vertical t hickness of approximately 0.5 foot of hydrated bentonite granules, and then by Portland cement gro ut containing approximately 5-percent

2 Cal/EPA, et al, 2015. Advisory, Active Soil Gas Investigations . July. 20201678.001A/LH21L131771 Page 6 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 bentonite by dry weight extending to approximately 0.5 foot bgs. The top approximate 0.5 foot of the bore was filled with sand. The tubing ends were capped and left extending slightly above the ground surface.

The 5-foot bgs and 15-foot bgs vapor implants for Probe KVP-3 were installed in separate bores.

The shallow vapor probe was installed in a bore hand augered to a depth of approximately 5.5 feet bgs. To construct probe KVP-3-5, a vapor implant connected to an adequate length of 0.25-inch OD Nylaflow™ tubing was lowered to approximately 5.0 feet bgs. An appropriate amount of sand to surround the vapor implant and extend from a few inches below it to a few inches above it was then poured into the annulus between the tubing and bore wall, creating a sand pack extending from approximately 4.5 feet to 5.5 feet bgs. The sa nd pack was topped with a vertical thickness of approximately 0.5 foot of dry bentonite (extending from approximately 4.0 feet to 4.5 feet bgs), followed by a vertical thickness of approximately 0 .5 foot of hydrated bentonite (extending from approximately 3.5 feet to 4.0 feet bgs). Next, the annulus between the tubing and bore wall was filled with Portland cement grout containing approx imately 5-percent bentonite by dry weight to

0.5-foot bgs. The top approximate 0.5 foot of the b ore was filled with sand. To construct Probe KVP-3-15, a vapor implant connected to the bottom o f an appropriate length of 0.25-inch OD Nylaflow™ tubing was lowered to approximately 15.0 feet bgs in a bore drilled to approximately

15.5 feet bgs. An appropriate amount of sand to sur round the vapor implant and extend from a few inches below it to a few inches above it was then poured into the annulus between the tubing and bore wall, creating a sand pack extending from approximately 14.0 feet to 15.5 feet bgs. The sand pack was topped with a vertical thickness of a pproximately 0.5 foot of dry bentonite (extending from approximately 14.0 feet to 13.5 fee t bgs), followed by a vertical thickness of approximately 0.5 foot of hydrated bentonite (extending from approximately 13.5 feet to 13.0 feet bgs). Next, the annulus between the tubing and bore wall was filled with Portland cement grout containing approximately 5-percent bentonite by dry weight to 0.5-foot bgs. The top approximate

0.5 foot of the bore was filled with sand. The tubi ng ends for both probes were capped and left extending slightly above the ground surface.

The bore logs provided in Attachment A include a pr obe construction schematic for each soil vapor probe on the log for the bore in which it was installed.

After installation, the soil vapor probes were left to equilibrate for a minimum period of 48 hours before they were purged and sampled. On September 1 3, 2021, Kleinfelder’s subcontractor Confluence Environmental, Inc. (Confluence), purged and sampled the soil vapor probes under Kleinfelder’s supervision. Pursuant to the afore-mentioned Cal/EPA joint guidance, before purging each probe, a shut-in test of the sampling train wa s performed as a leak check. Then, approximately three probe volumes were purged from each soil vapor probe completion prior to sample collection. A given “probe volume” was calcu lated based on the volume of the vapor probe’s implant and tubing and assumptions of 40-pe rcent sand porosity and 50-percent dry bentonite porosity. During purging and sampling, Co nfluence exposed the sampling train to helium as a leak check gas. The purged soil vapor w as monitored in the field for total volatile organic vapors and helium using handheld devices including a PID, Landtec GEM 2000 portable handheld monitor, and helium analyzer.

Laboratory Analyses

The soil, groundwater, and soil vapor samples collected at the Site were submitted to Kleinfelder’s subcontracted soil laboratory, ASSET Laboratories ( ASSET), a California Environmental 20201678.001A/LH21L131771 Page 7 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 Laboratory Accreditation Program (ELAP) accredited laboratory. Their requested analyses are discussed below by sample type.

Soil samples. Three soil samples from each bore wer e selected by Kleinfelder for laboratory analysis based on field observations and obtained PID readings. The soil samples were analyzed for TPH, speciated by carbon range, using US EPA Me thod 8015B and 8015B(M), with results reported for TPH-g, TPH-d, and TPH-mo; VOCs using U S EPA Method 8260B; and California Code of Regulations (CCR) Title 22 Metals using US EPA Method 7471A for mercury and US EPA Method 6010B for the remaining metals. In addition, based on its total chromium result, Sample KB-3-5, which was collected at approximately 5 feet bgs from Bore KB-3, was analyzed for soluble chromium using the CCR Title 22 Waste Extraction Test (WET) and US EPA Method 6010B and using the federal Toxicity Characteristic Leaching Procedure (TCLP) and US EPA Method 6010B.

Also, based on its total lead result, Sample KB-2-2 .5, which was collected at approximately

2.5 feet bgs from Bore KB-2, was analyzed for soluble lead using the CCR Title 22 WET and US EPA Method 6010B.

Groundwater samples. ASSET analyzed the groundwater samples for TPH, speciated by carbon range, using US EPA Method 8015B and 8015B(M), with results reported for TPH-g, TPH-d, and TPH-mo; VOCs using US EPA Method 8260B; and dissolved CCR Title 22 Metals using US EPA Method 7470A for mercury and US EPA Method 6010B for the remaining metals.

Soil vapor samples. ASSET analyzed the soil vapor s amples for VOCs using US EPA Method TO-15 for its full target analyte list.

FIELD OBSERVATIONS AND ANALYTICAL RESULTS

Field Observations

Subsurface soil lithologies observed by Kleinfelder during the ESA included sandy clay, clayey sand, and sandy silt in the upper 10 feet; underlai n by silty sand, poorly-graded sand, and well-graded sand. As previously mentioned, total vo latile organic vapor screening of soil was performed in the field by Kleinfelder staff using a PID that was calibrated with a 100-ppmv hexane standard. The PID readings are presented on the bore logs (Attachment A) in the column labeled “PID (ppmv).” As shown on the logs, measured PID readings ranged from less than 1.0 ppmv to a maximum of 4.4 ppmv, with this maximum PID reading produced by the soil samples collected from Bore KB-3 at approximately 25 feet bgs and Bor e KB-4 at approximately 10 feet bgs. No staining or visual indication of hydrocarbon impact or other chemical impact was observed in the soil samples.

Soil Sampling Analytical Results

TPH, VOCs, and total metals analytical results of t he 12 analyzed soil samples are tabulated in Tables 1 through 3, with Table 1 summarizing the TP H results, Table 2 summarizing the VOC results, and Table 3
summarizing the metals results (including soluble c hromium and soluble lead). In summary:

• As Table 1 indicates, TPH-g was present in trace a mounts in seven of the 12 analyzed soil samples, at concentrations ranging from 0.20 J milligram per kilogram (mg/kg) to

0.26 J mg/kg. The “J” laboratory qualifier indicates each of the reported concentrations is between the MDL and PQL and is therefore an estimat ed value. TPH-d was present in 20201678.001A/LH21L131771 Page 8 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 Sample KB-1-5, which was collected from Bore KB-1 a t approximately 5 feet bgs, at a concentration of 170 mg/kg but was not present at a concentration at or above its MDL in the remaining analyzed samples. TPH-mo was present in nine of the samples, at concentrations that ranged from 10 mg/kg to 1,800 m g/kg, with the highest TPH-mo concentration in Sample KB-1-5. Sample KB-2-5 conta ined the second highest TPH-mo concentration of 110 mg/kg and was collected from Bore KB-2 at approximately 5 feet bgs. • As Table 2 indicates, the VOCs 2-butanone and chlo romethane were reported to be present in one or more of the soil samples, with 2- butanone present in two samples, KB-1-5 and KB-2-2.5 (which was collected from approximately 2.5 feet bgs in Bore KB-2), at respective concentrations of 8.5 J micrograms pe r kilograms (µg/kg) and 10 J µg/kg.

Chloromethane was present in one sample, KB-3-20 (which was collected from Bore KB-3 at approximately 20 feet bgs), at a concentration of 0.81 J µg/kg. The remaining analyzed VOCs, including the gasoline constituents benzene, toluene, ethylbenzene, and xylenes (BTEX), were not present in the analyzed at concentrations at or above their MDLs. • As Table 3 indicates, the metals arsenic, barium, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, thallium, vanadium, and zinc were present in one or more soil samples at concentrations at or above the ir MDLs, with barium, chromium, cobalt, copper, lead, mercury, nickel, vanadium, an d zinc reported to be present in each analyzed sample. The maximum reported concentration of each metal present in the samples follows:

Metal Maximum Concentration in Soil Samples
(mg/kg)
Arsenic 3.2
Barium 110
Cadmium 0.63 J
Chromium 160
Cobalt 8.9
Copper 25
Lead 54
Mercury 0.11
Molybdenum 1.2
Nickel 15
Thallium 0.88 J
Vanadium 37
Zinc 56

• As Table 3 indicates, the chromium analytical resu lt for Sample KB-3-5 exceeds 10 times CCR Title 22’s Soluble Threshold Limit Concentration (STLC) for chromium and 20 times the federal chromium TCLP level, so it was analyzed for soluble chromium using the California WET and US EPA Method 6010B and the TCLP and US EPA Method 6010B.

The results indicated an STLC soluble chromium conc entration of 0.21 J milligrams per liter (mg/L) and a TCLP soluble chromium concentrat ion of 0.011 mg/L, which are below chromium’s STLC and TCLP value. Similarly, the lead analytical result for Sample KB-2-2.5 exceeds 10 times lead’s STLC so it was analyzed for soluble lead using 20201678.001A/LH21L131771 Page 9 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 the WET and US EPA Method 6010B. The result indicat ed a soluble lead concentration of 2.1 mg/L that is below lead’s STLC.

A copy of ASSET’s reports containing its analytical results for the soil samples is provided in Attachment B. Kleinfelder’s evaluation of the analy tical results is provided in the subsequent “Evaluation of Analytical Results” section of this report.

Groundwater Sampling Analytical Results

Analytical results of the five groundwater samples collected by Kleinfelder are tabulated in Tables 4 and 5, with Table 4 summarizing the TPH an d VOC results and Table 5 summarizing the dissolved metals results. In summary:

• As Table 4 indicates, TPH-g was present in the fiv e groundwater samples, at concentrations ranging from 0.21 J mg/L to 0.29 J m g/L. TPH-d and TPH-mo were not present in the five samples at concentrations at or above their respective MDL. • As Table 4 also indicates, the VOCs chloroform, ch loromethane, and PCE were reported to be present in one or more of the groundwater samples. Chloroform was present in one groundwater sample, KB-4 (collected from Bore KB-4) at a concentration of

0.75 micrograms per liter (µg/L); chloromethane was present in two samples, KB-1 and KB-2 (collected from Bores KB-1 and KB-2, respectiv ely) at respective concentrations of

0.30 J µg/L and 0.32 J µg/L; and PCE was present in four groundwater samples, at concentrations ranging from 0.52 µg/L to 2.4 µg/L, with the highest concentration in Sample KB-1 (collected from Bore KB-1). The remaining VOCs, including BTEX, were not present in the five samples at concentrations at or above their respective MDL. • As Table 5 indicates, the dissolved metals barium, chromium, copper, molybdenum, thallium, and vanadium were present in each of the five groundwater samples. The maximum reported concentration of each metal present in the samples follows:

Metal Maximum Concentration in Groundwater Samples
(mg/ L)
Barium 0.053
Chromium 0.0039
Copper 0.0086
Molybdenum 0.023
Thallium 0.029
Vanadium 0.0040

A copy of ASSET’s report containing its analytical results for the groundwater samples is provided in Attachment B. Kleinfelder’s evaluation of the an alytical results is provided in the subsequent “Evaluation of Analytical Results” section of this report.

Soil Vapor Sampling Analytical Results

The analytical results for the nine soil vapor samples collected by Kleinfelder from the soil vapor probes are tabulated in Table 6. In summary:

20201678.001A/LH21L131771 Page 10 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 • Helium (the leak-check tracer) was not present in the vapor samples at a concentration at or above its PQL.
• In total, 21 VOCs were present in one or more of th e vapor samples at concentrations at or above their respective MDL. The VOCs reported to be present, concentration range for each VOC, and number of samples containing them are listed below:

VOC
Concentration Range in
Soil Vapor Samples
(µg/m 3)
Number of
Samples in Which Present
Acetone 26.4 to 135 Each sample
Benzene Not present to 29.5 Seven
2-Butanone 10.3 to 87.3 Each sample
Carbon Disulfide 5.96 to 54.8 Each sample
Chloroform Not present to 9.61 Five
Chloromethane Not present to 1.77 J Two
cis-1,2-Dichloroethene Not present and 14.6 One
Dichlorodifluoromethane Not present to 3.87 J Two
Ethylbenzene Not present to 6.22 Three
4-Ethyltoluene Not present to 56.1 Four
4-Methyl-2-pentanone Not present to 11.7 J Two
Methylene chloride Not present to 352 Each sample
PCE Not present to 463 Eight
Toluene Not present to 49.5 Eight
Trichlorofluoromethane Not present to 54.3 Six
1,2,4-Trimethylbenzene Not present to 113 Six
1,3,5-Trimethylbenzene Not present to 29.8 Two
Vinyl Acetate 3.82 J to 32.0 Each sample
Vinyl Chloride Not present and 2.44 J One
m-p-Xylene Not present to 79.4 Eight
o-Xylene Not present to 30.9 Six

A copy of ASSET’s report containing its analytical results for the soil vapor samples is provided in Attachment B. Kleinfelder’s evaluation of the an alytical results is provided in the following section of this report.

EVALUATION OF ANALYTICAL RESULTS

To evaluate the measured concentrations of analytes reported to be present in the soil, soil vapor, and groundwater samples, Kleinfelder compared the c oncentrations to screening values consisting of (or based on) current DTSC-SLs
3 for analytes that have such values. To evaluate
the measured concentrations of those analytes without DTSC-SLs, Kleinfelder compared them to

3 Cal/EPA DTSC HERO, 2020a. Human Health Risk Assessment (HHRA) Note Number 3, DTSC-modified Screening Levels (DTSC-SLs), release date: June 202 0 . June. 20201678.001A/LH21L131771 Page 11 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 screening values consisting of (or based on) curren t Regional Screening Levels (RSLs) issued by the US EPA.4 The screening values used in Kleinfelder’s evaluat ion are included in Tables 1 through 6, as applicable. Although the Site’s use i s presently commercial, and its future use is anticipated to remain commercial, residential scree ning values are included in the tables for completeness, as recommended by the DTSC, but Klein felder’s evaluation focused on the commercial/industrial screening values (as an analy te’s concentrations that exceed its commercial/industrial screening value also exceed its residential screening value).

Also, for soil profiling purposes, the measured con centrations of a given metal in soil samples were compared to their respective CCR Title 22 Tota l Threshold Limit Concentration (TTLC), if the metal has a published TTLC, and compared to 10 times their CCR Title 22 STLC and 20 times their Federal TCLP value (if the metals have such published values).

Soil Analytical Results Evaluation

Kleinfelder’s evaluation of the soil analytical results indicated the following:

• Reported concentrations of TPH-g, TPH-d, and TPH-m o in the 12 analyzed soil samples are below their respective commercial/industrial DTSC-SLs and industrial RSLs for soil (if applicable for the analyte).
• In total, the 12 soil samples were reported to con tain two VOCs, 2-butanone and chloromethane, the concentrations of which are belo w their respective industrial RSL for soil. There is presently no commercial/industrial DTSC-SL for soil for either 2-butanone or chloromethane.
• Except for arsenic, reported concentrations of met als present in the 12 soil samples are below the metals’ respective commercial/industrial DTSC-SL and industrial RSL for soil (as applicable to the metal). Reported concentrations of each metal present are also below the metal’s TTLC. Arsenic was reported to be presen t in five of the soil samples at concentrations that exceed its DTSC-SL and industri al RSL. However, the DTSC has acknowledged that background and ambient concentrat ions of some inorganic elements present in Los Angeles County soils, including arsenic, exceed risk-based concentrations, and to evaluate arsenic concentrations at a propert y, DTSC guidance presently calls for comparing the site-specific 95-percent upper confidence limit (UCL) of the mean arsenic concentration to the southern California 95-percent UCL of the mean arsenic soil concentration of 3.1 mg/kg.
5 Kleinfelder used the ESA’s arsenic data set and the US EPA’s ProUCL™ software (Version 5.1.002) to calculate a S ite-specific 95-percent UCL of the mean arsenic concentration. The calculation resulted in a Site-specific 95-percent UCL of the mean arsenic concentration of 1.964 mg/kg that is considerably below the southern California 95-percent UCL of the mean arsenic soil concentration of 3.1 mg/kg. Thus, the presence of arsenic in the Site’s soil is not considered to be of concern. • Due to Sample KB-3-5’s total chromium concentratio n, soluble chromium analyses of it were performed using the WET and TCLP, and the resu lts are below chromium’s STLC and its TCLP value. Soluble lead analysis was simil arly performed on Sample KB-2-2.5 using the WET due to that sample’s total lead concentration, and the result is below lead’s

4 US EPA, 2021. Regional Screening Level (RSL) Summary Table (TR=1E -06, HQ=1) May 2021. May. 5 Cal/EPA DTSC HERO, 2020b. Human Health Risk Assessment (HHRA) Note Number 11, DTSC-modified Screening Levels (DTSC-SLs), release date: December 28, 2020 . December 28.

20201678.001A/LH21L131771 Page 12 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 STLC. Based on these results and the other results previously discussed, the sampled soil at the Site would be characterized as non-hazardous.

Groundwater Analytical Results Evaluation

Kleinfelder’s evaluation of the groundwater analytical results indicated the following:

• TPH-d, and TPH-mo were not reported to be present in the five groundwater samples at concentrations at or above their respective MDLs, s o no evaluation of their results was required. TPH-g was present in each of the samples at a trace concentration between TPH-g’s MDL and PQL. There is no MCL for TPH-g, and in Kleinfelder’s opinion the trace TPH-g concentrations are of minimal concern.
• The VOC results indicated the groundwater samples contained three VOCs in total:
chloroform, chloromethane, and PCE. The reported PC E concentrations are below its respective MCL, and the concentrations of chlorofor m, which is a trihalomethane, are below the MCL for total trihalomethanes. There curr ently is no MCL for chloromethane, and given its trace concentrations, in Kleinfelder’s opinion its presence in Site groundwater is not a concern. Although the PCE concentrations are below PCE’s MCL, its presence in the groundwater may affect disposal options for groundwater extracted at the Site during future construction activities.
• For analyzed metals that have a drinking water MCL , except for thallium, each metal’s dissolved concentrations in the five groundwater samples are below its MCL.

Soil Vapor Analytical Results Evaluation

As is presently recommended by the DTSC, Kleinfelder applied AFs to the ambient air DTSC-SLs and air RSLs to address attenuation from the subsur face to ambient air. The DTSC HERO’s previously-cited June 2020 guidance concerning use of its DTSC-SLs recommends using the AFs described in the DTSC's 2011 subsurface vapor intru sion guidance 6 along with the US EPA’s
default AF of 0.03 for “near-source” exterior soil vapor. 7 As such, Kleinfelder used soil vapor screening values based both on the US EPA’s recommended default AF of 0.03 for near-source soil vapor and the DTSC-recommended AF of 0.001 for evaluation of soil vapor beneath an existing commercial/industrial building. Kleinfelder’s evaluation of the soil vapor analytical results indicated the following:

• The benzene concentrations in Samples KVP-1-5, KVP -2-5, and KVP-3-5 (which were collected from the 5-foot bgs implants of Probes KVP-1, KVP-2, and KVP-3, respectively) exceed benzene’s commercial/industrial screening le vel for soil vapor that is based on benzene’s DTSC-SL for commercial/industrial air and the AF of 0.03. • The PCE concentrations in Samples KVP-1-15, KVP-2- 15, KVP-3-15, and KVP-4-15 (which were collected from the 15-foot bgs implants of Probes KVP-1, KVP-2, KVP-3, and KVP-4, respectively) exceed PCE’s commercial/indust rial screening level for soil vapor that is based on PCE’s DTSC-SL for commercial/industrial air and the AF of 0.03.

6 DTSC, 2011. Final Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (Vapor Intrusion Guidance) . October.
7 US EPA, 2015. https://www.epa.gov/sites/production/files/2015-09/ documents/oswer-vapor-intrusion- technical-guide-final.pdf .
20201678.001A/LH21L131771 Page 13 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 • Concentrations of other VOCs present in each soil vapor sample are below a given VOC’s commercial/industrial screening level(s) for soil vapor.

CONCLUSIONS AND RECOMMENDATIONS

Kleinfelder’s field observations and evaluations of the analytical results of samples collected during this Limited Phase II ESA have revealed the following:

Soil and Groundwater
• TPH and VOCs were present in sampled Site soil at concentrations below regulatory agency-issued human health risk-based screening levels for the respective analytes, and analyzed metals other than arsenic in the sampled soil were also present at concentrations below regulatory agency issued human health risk-ba sed screening levels for each respective metal. Kleinfelder’s evaluation of the a rsenic concentrations in the Site’s soil samples indicated they are below the mean arsenic concentration for southern California soil.
• TPH-g was present at trace concentrations in sampl ed Site groundwater, although TPH-d and TPH-o were not present at concentrations at or above their respective MDLs. Site groundwater VOC results indicated a presence of the VOCs chloroform, chloromethane, and PCE in one or more of the samples, although con centrations of each are below its respective MCL for drinking water. Dissolved metals results for sampled groundwater indicated reported concentrations for each metal present other than thallium are below the MCL for the respective metal, and Site groundwater is not used for potable water supply, so the drinking water MCL for thallium is not direc tly applicable. Based on the soil and groundwater analytical results, Kleinfelder anticipates that soil excavated at the Site and groundwater dewatered from the Site containing the analyte concentrations of the sampled soil and groundwater may be characterized as non-hazardous for the purpose of disposal. However, Kleinfelder recommends that Cost co provide the analytical results discussed herein to the disposal facility (or facil ities) selected for disposal to verify that it (or they) will meet facility-specific acceptance criteria. • Based on the reviewed soil and groundwater analyti cal results, no further soil or groundwater assessment is presently recommended.

Soil Vapor
• Benzene, an aromatic hydrocarbon VOC that is a gas oline constituent, was present at concentrations above its soil vapor screening level based on its commercial/industrial DTSC-SL in three of the four analyzed samples collected from the 5-foot bgs vapor probe implants. The highest benzene concentration was in the 5-foot bgs sample from Probe KVP-2, located in the southwestern portion of the S ite, and the next highest benzene concentration was in the 5-foot bgs sample from Probe KVP-1, in the northwestern portion of the Site. For the four loca tions from which both a 5-foot bgs and 15-foot bgs soil vapor sample was collected and ana lyzed, the benzene concentration in the 15-foot bgs soil vapor sample from a given loca tion was lower than in the 5-foot bgs soil vapor sample from the same location (and over an order of magnitude lower for the samples from Probes KVP-1 and KVP-2). Benzene was not present at a concentration at or above its MDL in the analyzed soil samples and g roundwater samples. This suggests a near-surface or surface source of benzene such as fuel leakage from parked automobiles.
20201678.001A/LH21L131771 Page 14 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242 • PCE, a chlorinated VOC historically used as a solv ent, was present at concentrations above its soil vapor screening level based on its commercial/industrial DTSC-SL in four of the five samples collected from the 15-foot bgs vap or probe implants. The highest PCE concentration was in the 15-foot bgs sample from Pr obe KVP-1, located in the northwestern portion of the Site. PCE concentration s in soil vapor at 15 feet bgs seem lowest beneath the middle portion of the Site. PCE was not present at a concentration at or above its MDL in the analyzed soil samples but w as present in the groundwater samples. Although PCE concentrations in sampled groundwater are below PCE’s drinking water MCL, the PCE source may be groundwater.
• Other reported VOC concentrations in soil vapor ar e below their respective commercial/industrial soil vapor screening levels.
• Since the Site is proposed to be redeveloped with a Costco gasoline station that will have no structure intended for human occupancy, the exis ting soil vapor conditions are not expected to adversely affect Costco’s workers and customers. • Based on the reviewed soil vapor analytical result s, no further assessment of soil vapor is recommended.

LIMITATIONS

Kleinfelder prepared this Phase II Report in accordance with generally accepted standards of care that exist in San Bernardino County, California at this time. This workplan may be used only by Costco and only for the purposes stated, within a r easonable time from its issuance but in no event later than 2 years from the workplan’s date. All information gathered by Kleinfelder is considered confidential and will be released only u pon written authorization of Costco or as required by law. Non-compliance with any of these r equirements by Costco, unless specifically agreed to in advance by Kleinfelder in writing, wil l release Kleinfelder from any liability resulting from the use of this workplan by any unauthorized p arty, but only to the extent of any such non-compliance by the Costco. Further limitations a pplicable hereto may be set forth in Kleinfelder’s written agreement with the Costco covering the work discussed herein.

20201678.001A/LH21L131771 Page 15 of 15 October 14, 2021 Copyright 2021 Kleinfelder

KLEINFELDER 24411 Ridge Route Drive, Suite 225, Laguna Hills, California p | 949.727.4466 f | 949.727.9242

CLOSING REMARKS

If you have questions or comments regarding this wo rkplan please do not hesitate to contact Paolo Dizon, Kleinfelder’s Project Manager, at (949) 727-4466.

Sincerely,

KLEINFELDER, INC.

Lindsey Dandridge-Perry Herbert (Bert) A. Vogler II I, PG Project Professional Principal Hydrogeologist

cc: Paolo Dizon, Kleinfelder

Attachments:

Figures
Figure 1 – Site Location Map
Figure 2 – Bore and Soil Vapor Probe Location Map
Tables
Table 1 – Soil Analytical Results – TPH
Table 2 – Soil Analytical Results – VOCs
Table 3 – Soil Analytical Results – Metals
Table 4 – Groundwater Analytical Results – TPH and VOCs Table 5 – Groundwater Analytical Results – Dissolved Metals Table 6 – Soil Vapor Analytical Results
Attachment A – Bore Logs
Attachment B – Analytical Laboratory Reports

20201678.001A/LH21L131771 October 14, 2021
Copyright 2021 Kleinfelder

FIGURES

© 2021 Microsoft Corporation © 2021 Maxar ©CNES (2021) Distribution Airbus DS The information included on this graphic representation has been compiled from avariety of sources and is subject to change without notice. Kleinfelder makes norepresentations or warranties, express or implied, as to accuracy, completeness,timeliness, or rights to the use of such information. This document is not intended foruse as a land survey product nor is it designed or intended as a construction designdocument. The use or misuse of the information contained on this graphicrepresentation is at the sole risk of the party using or misusing the information.CAD FILE: U:\Projects\CADD\CADD 2020\20201678\20201678_Costco_Culver-City.dwg N
DRAWN BY:PROJECT:CHECKED BY:REVISED:DATE:

FIGURESITE LOCATION MAP20201678DMFLDP10/2021- 1PROPOSED COSTCO WHOLESALE GAS STATION RELOCATIONCOSTCO WHOLESALE WAREHOUSE #47913463 WASHINGTON BOULEVARDCULVER CITY, CALIFORNIA - CW#19-0234 02,0002,0001,000APPROXIMATE SCALE (feet)
SOURCE: U.S.G.S. 7.5' topographic series, Venice andBeverly Hills, California quadrangles dated 2018.

PLOTTED: 10/4/2021 5:36 PM BY: dean fahrney
SITE
CAD FILE: U:\Projects\CADD\CADD 2020\20201678\20201678_Costco_Culver-City.dwg LAYOUT: 2 PLOTTED: 10/6/2021 5:03 PM BY: dean fahrney The information included on this graphic representation has been compiled from a variety ofsources and is subject to change without notice. Kleinfelder makes no representations orwarranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use ofsuch information. This document is not intended for use as a land survey product nor is it designedor intended as a construction design document. The use or misuse of the information contained onthis graphic representation is at the sole risk of the party using or misusing the information.

N
030 3015APPROXIMATE SCALE (feet)
FIGUREDRAWN BYDATE:

PROJECT:CHECKED BYREVISED:

BORE AND SOIL VAPOR PROBELOCATION MAPPROPOSED COSTCO WHOLESALE GASOLINE STATION RELOCATIONCOSTCO WHOLESALE WAREHOUSE #47913463 WASHINGTON BOULEVARDCULVER CITY, CALIFORNIA - CW#19-0234 20201678DMFLDP10/2021- 2
REFERENCE: ENLARGED CONCEPT PLAN (DD15-17)PROVIDED BY MG2, DATED 09/24/20

WASHINGTON BLVD

WALNUT AVE
APPROXIMATE GROUNDWATERMONITORING WELL LOCATIONB-1 EXPLANATION APPROXIMATE BORE LOCATIONKB-5 KB-2KB-3
KB-4KB-1
KVP-2KVP-5KVP-3-15KVP-3-5
KVP-4KVP-1E E E E E E E ESD
SD
SDSDSD
SDSDSD
W
W WWFO
FO
FO
SDSD

ELECTRICAL LINEWATER LINEFIBER OPTIC LINESTORM DRAIN
EWFOSD
APPROXIMATE SOIL VAPORPROBE LOCATIONKVP-5
B-1

20201678.001A/LH21L131771 October 14, 2021
Copyright 2021 Kleinfelder

TABLES
TABLE 1
SOIL ANALYTICAL RESULTS – TPH
Proposed Costco Gasoline Station
13431 and 13455 Washington Boulevard
Culver City, California
TPH-g TPH-d TPH-mo
(mg/kg) (mg/kg) (mg/kg)
8015B 8015B(M) 8015B(M)
KB-1-5 5.0 9/8/2021 ND<0.19 170 1,800
KB-1-15 15.0 9/8/2021 ND<0.22 ND<10 ND<10
KB-1-20 20.0 9/8/2021 ND<0.23 ND<9.9 10
KB-2-2.5 2.5 9/8/2021 ND<0.21 ND<10 76
KB-2-5 5.0 9/8/2021 ND<0.22 ND<10 110
KB-2-25 25.0 9/8/2021 0.21 J ND<10 29
KB-3-5 5.0 9/9/2021 0.20 J ND<10 25
KB-3-10 10.0 9/9/2021 0.20 J ND<10 ND<10
KB-3-20 20.0 9/9/2021 0.21 J ND<10 11
KB-4-2.5 2.5 9/9/2021 0.22 J ND<9.9 49
KB-4-5 5.0 9/9/2021 0.20 J ND<10 40
KB-4-10 10.0 9/9/2021 0.26 J ND<10 ND<10

NV / NV NV / NV NV / NV
NV / NV NV / 500 NV / 18,000
251 96 11,519
1,191 460 145,028
Notes:

TPH Total petroleum hydrocarbons.

TPH-g Gasoline-range TPH (carbon range C
6 through C 12 )
TPH-d Diesel-range TPH (carbon range C 13 through C 22 ).

TPH-mo Motor oil-range TPH (carbon range C 23 through C 40 ). mg/kg Milligrams per kilogram.
bgs Below ground surface.
8015B / 8015B(M) United States Environmental Protect ion Agency (US EPA) analytical method number.

ND<0.19
J

DTSC-SL
NV Analyte has no published value.

RSL
US EPA RSL – Residential
Not present at a concentration at or above the indi cated laboratory method detection limit that follow s the less- than ("<") symbol.

US EPA Regional Screening Level for soil, May 2021. TPH-g RSLs are based on TPH Aliphatic and Aromatic Low RSLs; TPH-d RSLs are based on TPH Aliphatic and Aro matic Medium RSLs; and TPH-mo RSLs are based on TPH Aliphatic and Aromatic High RSLs. The two RSL v alues for each of the three TPH fractions were used in the following equation: RSL
TPH (Total) = 1/[(0.80/RSL TPH (Aliphatic) ) + (0.20/RSL TPH (Aromatic) )].

TPH
Modified soil screening level from California Environmental Protection Agency Department of Toxic Subs tances Control (DTSC) Office of Human and Ecological Risk (HERO) Human Health Risk Assessment (HHRA) Note Number 3, DTSC-modified Screening Levels (DTSC-SLs) . Release date: June 2020. DTSC-SL values shown for TPH-g, TPH-d, and TPH-mo are Aliphatic / Aromatic L ow, Aliphatic / Aromatic Medium, and Aliphatic / Aromatic High, respectively.

Sample
Depth
(feet bgs) Date Sampled
DTSC-SL – Commercial/Industrial
US EPA RSL – Industrial
Bore
KB-1
KB-2
KB-3
KB-4
Laboratory qualifier indicating result is between the MDL and practical quantitation limit and therefo re is an estimated value.

DTSC-SL – Residential
20201678.001A/LH21L131771
Copyright 2021 Kleinfelder

TABLE 2
SOIL ANALYTICAL RESULTS – VOCs
Proposed Costco Gasoline Station
13431 and 13455 Washington Boulevard
Culver City, California
Benzene 2-Butanone Chloromethane Ethylbenzene Toluene m,p-Xylenes o-Xylene Other VOCs (µg/kg) (µg/kg) (µg/kg) (µg/kg) (µg/kg) (µg/kg) (µg/kg) (µg/kg) KB-1-5 5.0 9/8/2021 ND<0.16 8.5 J ND<0.35 ND<0.17 ND<0.22 ND<0.34 ND<0.13 ND<0.091 - ND<4. 9 KB-1-15 15.0 9/8/2021 ND<0.22 ND<9.6 ND<0.47 ND<0.23 ND<0.30 ND<0.46 ND<0.18 ND<0.12 - ND<6.7 KB-1-20 20.0 9/8/2021 ND<0.20 ND<8.7 ND<0.43 ND<0.21 ND<0.27 ND<0.42 ND<0.16 ND<0.11 - ND<6.0 KB-2-2.5 2.5 9/8/2021 ND<0.18 10 J ND<0.38 ND<0.18 ND<0.24 ND<0.37 ND<0.14 ND<0.099 - ND<5. 4 KB-2-5 5.0 9/8/2021 ND<0.19 ND<8.4 ND<0.41 ND<0.20 ND<0.26 ND<0.40 ND<0.16 ND<0.11 - ND<5.8 KB-2-25 25.0 9/8/2021 ND<0.18 ND<8.1 ND<0.40 ND<0.19 ND<0.25 ND<0.39 ND<0.15 ND<0.10 - ND<5.6 KB-3-5 5.0 9/9/2021 ND<0.17 ND<7.5 ND<0.37 ND<0.18 ND<0.23 ND<0.36 ND<0.14 ND<0.0.096 - ND<5.2 KB-3-10 10.0 9/9/2021 ND<0.19 ND<8.5 ND<0.42 ND<0.20 ND<0.26 ND<0.41 ND<0.16 ND<0.11 - ND<5.9 KB-3-20 20.0 9/9/2021 ND<0.20 ND<8.6 0.81 J ND<0.21 ND<0.27 ND<0.42 ND<0.16 ND<0.11 - ND<6.0 KB-4-2.5 2.5 9/9/2021 ND<0.17 ND<7.6 ND<0.38 ND<0.18 ND<0.24 ND<0.37 ND<0.14 ND<0.098 - ND<5.3 KB-4-5 5.0 9/9/2021 ND<0.18 ND<8.0 ND<0.39 ND<0.19 ND<0.25 ND<0.38 ND<0.15 ND<0.10 - ND<5.5 KB-4-10 10.0 9/9/2021 ND<0.22 ND<9.5 ND<0.47 ND<0.23 ND<0.29 ND<0.46 ND<0.18 ND<0.12 - ND<6.6 330 NV NV NV 1,100,000 NV NV Vary or NV
1,400 NV NV NV 5,300,000 NV NV Vary or NV
1,200 27,000,000 110,000 5,800 4,900,000 550,000 650,000 V ary or NV 5,100 190,000,000 460,000 25,000 47,000,000 2,400,000 2,8 00,000 Vary or NV Notes:

VOCs Volatile organic compounds.
µg/kg Micrograms per kilogram.
bgs Below ground surface.
5035/8260B United States Environmental Protection Agency (US EPA) analytical method number.

ND<0.16 Not present at a concentration at or above the indicated laboratory method detection limit (MDL) that follows the less-than ("<") symbol.

J

DTSC-SL
NV Analyte has no published value.

RSL US EPA Regional Screening Level for soil, May 2021. 8260B
VOCs
Modified soil screening level from California Envir onmental Protection Agency Department of Toxic Substances Control (DTSC) Office of Human and Ecologica l Risk (HERO) Human Health Risk Assessment (HHRA) Note Number 3, DTSC-modified Screening Levels (DTSC-SLs) . Release date: June 2020.

Bore
DTSC-SL – Commercial/Industrial
US EPA RSL – Industrial
KB-1
KB-2
KB-3
KB-4
Sample Date Sampled
Depth
(feet bgs)
Laboratory qualifier indicating result is between the MDL and practical quantitation limit and therefore is an estimated value.

DTSC-SL – Residential
US EPA RSL – Residential
20201678.001A/LH21L131771
Copyright 2021 Kleinfelder

TABLE 3
SOIL ANALYTICAL RESULTS – METALS
Proposed Costco Gasoline Station
13431 and 13455 Washington Boulevard
Culver City, California
Antimony Arsenic Barium Beryllium Cadmium Chromium
Chromium
(STLC)
Chromium
(TCLP) Cobalt Copper Lead
Lead
(STLC) Mercury Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/L) (mg /L) (mg/kg) (mg/kg) (mg/kg) (mg/L) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) 6010B 6010B 6010B 6010B 6010B 6010B WET / 6010B TCLP 6010B 60 10B 6010B WET / 6010B 7471A 6010B 6010B 6010B 6010B 6010B 601 0B 6010B KB-1-5 5.0 9/8/2021 ND<0.33 2.8 70 ND<0.22 0.54 J 20 NA NA 6.6 17 8.3 NA 0.030 J ND<0.30 13 ND<0 .60 ND<0.62 ND<0.35 35 37 KB-1-15 15.0 9/8/2021 ND<0.33 ND<0.54 21 ND<0.22 0.29 J 6.5 NA NA 3.3 3.4 0.77 J NA 0 .048 J ND<0.30 3.2 ND<0.60 ND<0.62 0.71 J 25 12 KB-1-20 20.0 9/8/2021 ND<0.33 ND<0.54 19 ND<0.22 ND<0.27 4.7 NA NA 1.9 3.2 1.2 NA 0.0 27 J ND<0.30 4.2 ND<0.60 ND<0.62 0.88 J 15 12 KB-2-2.5 2.5 9/8/2021 ND<0.33 3.2 74 ND<0.22 0.55 J 22 NA NA 6.6 25 54 2.1 0.027 J ND<0.30 13 ND<0 .60 ND<0.62 0.74 J 35 41 KB-2-5 5.0 9/8/2021 ND<0.33 1.9 63 ND<0.22 0.48 J 20 NA NA 6.2 16 8.4 NA 0.044 J ND<0.30 12 ND<0 .60 ND<0.62 0.62 J 35 34 KB-2-25 25.0 9/8/2021 ND<0.33 ND<0.54 36 ND<0.22 0.34 J 13 NA NA 5.7 1.7 1.2 NA 0.067 J 1.2 5.9 ND<0.60 ND<0.62 0.79 J 20 16 KB-3-5 5.0 9/9/2021 ND<0.33 ND<0.54 110 ND<0.22 0.61 J 160 0.21 J 0.011 J 6.7 13 3.2 NA 0.017 J ND<0.30 15 ND<0.60 ND<0.62 ND<0.35 36 34 KB-3-10 10.0 9/9/2021 ND<0.33 ND<0.54 47 ND<0.22 0.52 J 19 NA NA 5.0 13 2.4 NA 0.11 ND <0.30 11 ND<0.60 ND<0.62 0.55 J 30 28 KB-3-20 20.0 9/9/2021 ND<0.33 ND<0.54 30 ND<0.22 0.33 J 9.6 NA NA 3.5 4.3 1.0 NA 0.04 8 J 0.39 J 4.3 ND<0.60 ND<0.62 ND<0.35 20 17 KB-4-2.5 2.5 9/9/2021 ND<0.33 1.9 90 ND<0.22 0.63 J 21 NA NA 8.9 15 6.6 NA 0.069 J ND<0.30 15 ND<0 .60 ND<0.62 ND<0.35 37 56 KB-4-5 5.0 9/9/2021 ND<0.33 2.8 68 ND<0.22 0.62 J 20 NA NA 7.4 15 5.5 NA 0.048 J ND<0.30 14 ND<0 .60 ND<0.62 ND<0.35 34 34 KB-4-10 10.0 9/9/2021 ND<0.33 ND<0.54 30 ND<0.22 0.37 J 7.9 NA NA 4.7 5.5 1.4 NA 0.04 7 J ND<0.30 5.4 ND<0.60 ND<0.62 ND<0.35 25 17 NV 0.11 NV 16 71 NV NA NA NV NV 80 NA 1 NV 820 NV NV NV NV NV NV 0.36 NV 230 780 NV NA NA NV NV 320 NA 4.4 NV 11,000 NV NV NV NV NV 31 0.7 15,000 160 71* 120,000** NA NA 23 3,100 400 NA 11 390 1,50 0*** 390 390 0.78*** 390 23,000 470 3.0 220,000 2,300 980* 1,800,000** NA NA 350 47,000 800 NA 46 5,800 22,000*** 5,800 5,800 12 5,800 350,000 500 500 10,000 75 100 2,500 NA NA 8,000 2,500 1,000 NA 20 3,500 2 ,000 100 500 700 2,400 5,000 15 5.0 100 0.75 1.0 5.0 5.0 NA 80 25 5.0 5.0 0.2 350 20 1.0 5.0 7.0 2 4 250 NV 5.0 100 NV 1.0 5.0 NA 5.0 NV NV 5.0 NA 0.2 NV NV 1.0 5.0 NV NV NV 10 times STLC 150 50 1,000 7.5 10 50 NA NA 800 250 50 NA 2.0 3,500 200 10 50 70 240 2,500 20 times TCLP NV 100 2,000 NV 20 100 NA NA NV NV 100 NA 4.0 NV NV 20 100 NV NV NV Notes:
mg/kg Milligrams per kilogram.
bgs Below ground surface.
6010B / 7471A United States Environmental Protection Age ncy (US EPA) analytical method number.

WET California Code of Regulations Title 22 Waste Extrac tion Test.

TCLP Federal Toxicity Characteristic Leaching Procedure.

ND<0.33 Not present at a concentration at or above t he indicated laboratory method detection limit that follows the less-than ("<") symbol.

J Laboratory qualifier indicating result is between the MDL and practical quantitation limit and theref ore is an estimated value.

NA Sample not analyzed for analyte (if indicated as a sample's analytical result) or item is not applica ble to result (if shown beneath analytical results) .

DTSC-SL
RSL US EPA Regional Screening Level for soil, May 2021.

NV Analyte has no published value.
* Value is for cadmium in diet.
** Value is for trivalent chromium.
*** Value is for soluble salts.

TTLC California Code of Regulations Title 22 Total T hreshold Limit Concentration.

STLC California Code of Regulations Title 22 Soluble T hreshold Limit Concentration. mg/L Milligrams per liter.

2.8 Result shown in bold font is higher than analyte's Commercial/Industrial DTSC-SL for soil.

Result with highlighted background is greater than 10 times STLC and/or 20 times TCLP.

TTLC (mg/kg)
STLC (mg/L)
TCLP Value (mg/L)
Modified soil screening level from California Enviro nmental Protection Agency Department of Toxic Substan ces Control (DTSC) Office of Human and Ecological Ris k (HERO) Human Health Risk Assessment (HHRA) Note Number 3, DTSC-modified Screening Levels (DTSC-SLs) . Release date: June 2020.

Depth (feet
bgs) Date Sampled Sample
DTSC-SL – Commercial/Industrial
US EPA RSL – Industrial
Bore
KB-1
KB-2
KB-3
KB-4
DTSC-SL – Residential
US EPA RSL – Residential
20201678.001A/LH21L131771
Copyright 2021 Kleinfelder

TABLE 4
GROUNDWATER ANALYTICAL RESULTS - TPH AND VOCs
Proposed Costco Gasoline Station
13431 and 13455 Washington Boulevard
Culver City, California
TPH-g TPH-d TPH-mo Benzene Chloroform Chloromethane Ethylbenzene PCE Toluene m,p-Xylenes o-Xylenes Other VOCs (mg/L) (mg/L) (mg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) 8015B(M)
KB-1 KB-1 9/10/2021 0.022 J ND<0.20 ND<0.20 ND<0.11 ND<0.38 0.30 J ND<0.11 2.4 ND<0.13 ND<0.23 ND<0.087 ND<0.051 - ND<4.7 KB-2 KB-2 9/10/2021 0.029 J ND<0.20 ND<0.20 ND<0.11 ND<0.38 0.32 J ND<0.11 0.52 ND<0.13 ND<0.23 ND<0.087 ND<0.051 - ND<4.7 KB-3 KB-3 9/10/2021 0.021 J ND<0.20 ND<0.20 ND<0.11 ND<0.38 ND<0.23 ND<0.11 ND<0.25 ND<0.13 ND<0.23 ND<0.087 ND<0.051 - ND<4.7 KB-4 KB-4 9/10/2021 0.021 J ND<0.20 ND<0.20 ND<0.11 0.75 ND<0.23 ND<0.11 0.69 ND<0.13 ND<0.23 ND<0.087 ND<0.051 - ND<4.7 B-1 B-1 9/13/2021 0.022 J ND<0.20 ND<0.20 ND<0.11 ND<0.38 ND<0.23 ND<0.11 0.69 ND<0.13 ND<0.23 ND<0.087 ND<0.051 - ND<4.7 NV NV NV 1.0 80* NV 300 5.0 150 Vary or NV
NV NV NV 5.0 80* NV 700 5.0 1,000 Vary or NV
Notes:

TPH Total petroleum hydrocarbons.

VOCs Volatile organic compounds.

TPH-g Gasoline-range TPH (carbon range C 6 through C12).

TPH-d Diesel-range TPH (carbon range C 13 through C22).

TPH-mo Motor oil-range TPH (carbon range C 23 through C40). mg/L Milligrams per liter.
µg/L Micrograms per liter.
8015B/8015B(M)/8260B United States Environmental Protection Agency (US EPA) analytical method number.

ND<0.20 Not present at a concentration at or above the indicated laboratory method detection limit that follows the less-than ("<") symbol.

J Laboratory qualifier indicating result is between the MDL and practical quantitation limit and therefore is an estimated value.

California MCL California Maximum Contaminant Level (updated October 2018).

NV Analyte has no published value.

US EPA MCL Federal Maximum Contaminant Level (from US EPA May 2021 RSLs table). * MCL is for total trihalomethanes, which include chloroform, bromodichloromethane, dibromochloromethane, and bromoform.

Bore
California MCL
US EPA MCL 1,750
1,750
8015B 8260BSample Date Sampled
TPH VOCs
20201678.001A/LH21L131771
Copyright 2021 Kleinfelder

TABLE 5

GROUNDWATER ANALYTICAL RESULTS - DISSOLVED METALS
Proposed Costco Gasoline Station
13431 and 13455 Washington Boulevard
Culver City, California
Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Mercury Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) 7470A
KB-1 KB-1 9/10/2021 ND<0.0045 ND<0.0077 0.044 ND<0.00031 ND<0.00085 0.0036 ND<0.0019 0.0086 ND<0.0040 ND<0.00012 0.023 ND<0.0020 ND<0.0085 ND<0.0024 0.029 0.0033 ND<0.0077 KB-2 KB-2 9/10/2021 ND<0.0045 ND<0.0077 0.043 ND<0.00031 ND<0.00085 0.0030 J ND<0.0019 0.0076 ND<0.0040 ND<0.00012 0.016 ND<0.0020 ND<0.0085 ND<0.0024 0.028 0.0033 ND<0.0077 KB-3 KB-3 9/10/2021 ND<0.0045 ND<0.0077 0.053 ND<0.00031 ND<0.00085 0.0028 J ND<0.0019 0.0074 ND<0.0040 ND<0.00012 0.014 ND<0.0020 ND<0.0085 ND<0.0024 0.024 0.0040 ND<0.0077 KB-4 KB-4 9/10/2021 ND<0.0045 ND<0.0077 0.042 ND<0.00031 ND<0.00085 0.0020 J ND<0.0019 0.0074 ND<0.0040 ND<0.00012 0.017 ND<0.0020 ND<0.0085 ND<0.0024 0.026 0.0035 ND<0.0077 B-1 B-1 9/13/2021 ND<0.0045 ND<0.0077 0.040 ND<0.00031 ND<0.00085 0.0039 ND<0.0019 0.0071 ND<0.0040 ND<0.00012 0.0083 ND<0.0020 ND<0.0085 ND<0.0024 0.025 0.0035 ND<0.0077

0.006 0.010 1.0 0.004 0.005 0.05 NV 1.3 0.015 0.002 NV 0.1 0.05 NV 0.002 NV NV

0.006 0.010 2.0 0.004 0.005 0.10 NV 1.3 0.015 0.002 NV NV 0.05 NV 0.002 NV NV Notes:
mg/L Micrograms per liter.

ND<0.0045 Not present at a concentration at or above the indicated laboratory method detection limit that follows the less-than ("<") symbol.

J Laboratory qualifier indicating result is between the MDL and practical quantitation limit and therefore is an estimated value. 6010B / 7470A United States Environmental Protection Agency (USEPA) analytical method number.

California MCL California Maximum Contaminant Level (updated October 2018).

NV Analyte has no published value.

US EPA MCL Federal Maximum Contaminant Level (from US EPA May 2021 RSLs table).

0.029 Result shown in bold font is higher than analyte's MCL for drinking water.

Bore
California MCL

US EPA MCL
6010B6010BSample Date Sampled
20201678.001A/LH21L131771
Copyright 2021 Kleinfelder

TABLE 6

SOIL VAPOR ANALYTICAL RESULTS
Proposed Costco Gasoline Station
13431 and 13455 Washington Boulevard
Culver City, California
Acetone Benzene
2-Butanone
(MEK)
Carbon
disulfide Chloroform
Chloro-
methane
cis-1,2-
Dichloroethene
Dichloro-
difluoromethane
(Freon 12)
Ethyl-
benzene
4-
Ethyltoluene
4-Methyl-2-
pentanone
(MIBK)
Methylene
chloride PCE Toluene
Trichlorofluoro-
methane
1,2,4-
Trimethyl-
benzene
1,3,5-
Trimethyl-
benzene
Vinyl
Acetate
Vinyl
Chloride
m,p-
Xylenes o-Xylene Other VOCs
µg/m³
KVP-1-5 5.0 9/13/2021 ND<300,000 69.8 25.8 16.0 54.8 ND<1.18 1.77 J 14.6 3.59 J 6.22 56.1 ND<1.26 6.83 9.33 19.0 ND<1.10 113 29.8 24.1 2.44 J 36.7 19.7 ND<0.673 - ND<3.61 KVP-1-15 15.0 9/13/2021 ND<290,000 60.9 ND<1.58 57.8 20.6 N D<1.88 ND<1.15 ND<1.75 ND<2.27 ND<1.82 ND<1.75 ND<2.00 110 463 8.82 54.3 5.38 J ND<1.52 8.67 J ND<1.21 7.13 J 4.22 J ND<1. 07 - ND<5.74 KVP-2-5 5.0 9/13/2021 ND<300,000 135 29.5 26.3 52.3 ND<5.19 ND<3.19 ND<4.82 ND<6.28 ND<5.03 25.2 11.7 J 159 ND<7.24 36.4 ND<4.82 44.2 ND<4.20 19.8 J ND<3.35 23.7 J 19.0 ND<2.96 - ND<15.9 KVP-2-15 15.0 9/13/2021 ND<300,000 42.8 2.40 J 56.8 35.1 3. 51 J ND<0.649 ND<0.982 ND<1.28 ND<1.02 ND<0.987 ND<1.13 92 .9 289 5.28 38.6 ND<0.819 ND<0.855 6.80 ND<0.682 2.38 J ND<0.849 N D<0.602 - ND<3.23 KVP-3-5 5.0 9/13/2021 ND<300,000 79.1 17.4 26.1 51.2 3.77 J ND<0.637 ND<0.965 ND<1.26 4.01 ND<0.970 6.61 J 149 14.6 49.5 ND<0.965 4.87 ND<0.840 32.0 ND<0.670 10.1 4.30 ND<0.592 - ND<3.17 KVP-3-15 15.0 9/13/2021 ND<340,000 54.6 4.89 87.3 35.7 5.45 ND<0.683 ND<1.03 ND<1.35 3.91 17.9 ND<1.18 13.3 189 34.0 38.9 34.6 7.61 10.7 ND<0.718 79.4 30.9 ND<0.634 - ND<3 .40 KVP-4-5* 5.0 9/13/2021 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- KVP-4-15 15.0 9/13/2021 ND<290,000 47.7 1.78 J 19.4 9.37 3. 31 J 1.37 J ND<0.999 3.87 J ND<1.04 ND<1.00 ND<1.15 352 88.7 7.54 26.5 ND<0.834 ND<0.870 7.66 ND<0.694 2.72 J ND<0.864 N D<0.613 - ND<3.28 KVP-5-5 5.0 9/13/2021 ND<300,000 26.4 2.35 J 10.3 16.2 9.61 ND<0.698 ND <1.06 ND<1.38 ND<1.10 ND<1.06 ND<1.21 64.0 22.6 12.8 4.34 J 3.26 J ND<0.920 3.82 J ND<0.734 4.63 J 2.72 J ND<0.648 - ND<3.47 KVP-5-15 15.0 9/13/2021 ND<440,000 31.5 ND<0.958 14.9 5.96 ND<1.14 ND<0.698 ND<1.06 ND<1.38 ND<1.10 ND<1.06 ND<1.21 6 .71 11.2 ND<1.08 40.7 ND<0.882 ND<0.920 26.2 ND<0.734 ND<2. 03 ND<0.914 ND<0.648 - ND<3.47 DTSC-SL – Residential (AF = 0.03) -- NV 3.2 NV NV NV NV 277 NV NV NV NV 33 15 10,333 43,333 NV NV NV 0.32 NV NV Vary or NV DTSC-SL – Commercial/Industrial (AF = 0.03) -- NV 14 NV NV NV NV 1,167 NV NV NV NV 400 67 43,333 176,667 NV NV NV 5.3 NV NV Vary or NV RSL - Residential (AF = 0.03) -- 1,066,667 12 173,333 24,333 4.0 3,133 NV 3,333 37 NV 103,333 3,333 367 173,333 NV 2,100 2,100 7,000 5.7 3,333 3,333 Vary or NV RSL - Industrial (AF = 0.03) -- 4,666,667 53 733,333 103,333 18 13,000 NV 14,667 163 NV 433 ,333 40,000 1,567 733,333 NV 8,667 8,667 29,333 93 14,667 14, 667 Vary or NV DTSC-SL – Residential (AF = 0.001) -- NV 97 NV NV NV NV 8,300 NV NV NV NV 1,000 460 310,000 1,300,000 NV NV NV 9.5 N V NV Vary or NV DTSC-SL – Commercial/Industrial (AF = 0.001) -- NV 420 NV NV NV NV 35,000 NV NV NV NV 12,000 2,000 1,300,000 5,300,000 NV NV NV 160 NV NV Vary or NV RSL - Residential (AF = 0.001) -- 32,000,000 360 5,200,000 730,000 120 94,000 NV 100,000 1,100 NV 3,100,000 100,000 11,000 5,200,000 NV 63,0 00 63,000 210,000 170 100,000 100,000 Vary or NV RSL - Industrial (AF = 0.001) -- 140,000,000 1,600 22,000,000 3,100,000 530 390,000 NV 440,000 4,900 NV 13,000,000 1,200,000 47,000 22,000,000 NV 260,000 260,000 880,000 2,800 440,000 440,000 Vary or NV Notes:

VOCs Volatile organic compounds.

MEK Methyl ethyl ketone.

MIBK Methyl isobutyl ketone.

PCE Tetrachloroethylene.
µg/m³ micrograms per cubic meter.
bgs Below ground surface.

ASTM D1946 ASTM International (ASTM) analytical method number. 8260B United States Environmental Protection Agency ( US EPA) analytical method number.

ND<10 Not present at a concentration at or above the indicated laboratory method detection limit that follows the less-than ("<") symbol.

J Laboratory qualifier indicating result is between the MDL and practical quantitation limit and therefore is an estimated value. * Sample KVP-4-5 was lost during laboratory analysis.

DTSC-SL Soil vapor screening level based on modified screening level for ambient air provided in California Environmental Protection Agency, Department of Toxic Substances Control (DTSC), Office of Human and Ecological Risk (HERO) Human Health Risk Assessment (HHRA) Note, HERO HHRA Note Number 3, DTSC-modified Screening Levels (DTSC-SLs) , June 2020.

AF Soil vapor to indoor air attenuation factor recomm ended by the DTSC and US EPA.

NV Analyte has no published value.

RSL Soil vapor screening level based on US EPA Region al Screening Level for air, May 2021.

25.8 Result shown in bold font is higher than analyte's screening value based on analyte's Commercial/Industrial DTSC-SL and/or US EPA Industrial RSL.

KVP-2
KVP-3
KVP-5
Vapor Probe
KVP-1
KVP-4
Sample
Depth
(feet bgs) Date Sampled
VOCs
Helium
(leak check
tracer)
µg/m ³
8260B
20201678.001A/LH21L131771
Copyright 2021 Kleinfelder

20201678.001A/LH21L131771 October 14, 2021
Copyright 2021 Kleinfelder

ATTACHMENT A

BORE LOGS

B-1

GRAPHICS KEY
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
Cu 6 and
1 Cc 3
GP-GM
GP-GC
GM

CLAYEY GRAVELS,

GRAVEL-SAND-CLAY MIXTURES

GRAVELS
WITH >
12%
FINES
>
Cu 4 and
1 Cc 3
>_
_
_ _
_

INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY, GRAVELLY

CLAYS, SANDY CLAYS, SILTY CLAYS, LEAN CLAYS
<
>
<
<
>
CLEAN
SANDS
WITH
<5%
FINES
GRAVELS (More than half of coarse fraction is larger than the #4 sieve) Cu 6 and/
or 1 Cc 3
_ _ <

SILTS AND CLAYS
(Liquid Limit
less than 50)

CLAYEY SANDS, SAND-SILT-CLAY

MIXTURES
CL
CL-ML
Cu 6 and/
or 1 Cc 3
>
GC-GM
SW
SW-SC

POORLY GRADED SANDS,

SAND-GRAVEL MIXTURES WITH

LITTLE FINES
GW
GP

POORLY GRADED SANDS,

SAND-GRAVEL MIXTURES WITH

LITTLE CLAY FINES
COARSE GRAINED SOILS (More than half of material is larger than the #200 sieve) UNIFIED SOIL CLASSIFICATION SYSTEM (ASTM D 2487)
>
<
<

WELL-GRADED SANDS, SAND-GRAVEL

MIXTURES WITH LITTLE FINES
Cu 4 and/
or 1 Cc 3
>
CLEAN
GRAVEL
WITH
<5%
FINES

GRAVELS
WITH
5% TO
12%
FINES
OL
CH
MH
OH
ML
GC
SP
SP-SM
SP-SC
SM
SC
< _

SAMPLE/SAMPLER TYPE GRAPHICS
<
>_
_

SILTY SANDS, SAND-GRAVEL-SILT

MIXTURES
GW-GM
>
<

FINE GRAINED SOILS
(Half or more of material is
smaller than
the #200 sieve) SILTS AND CLAYS
(Liquid Limit
50 or greater)
SANDS (Half or more of coarse fraction is smaller than the #4 sieve)

WELL-GRADED SANDS, SAND-GRAVEL

MIXTURES WITH LITTLE OR NO FINES

POORLY GRADED SANDS,

SAND-GRAVEL MIXTURES WITH

LITTLE OR NO FINES

WELL-GRADED GRAVELS,

GRAVEL-SAND MIXTURES WITH

LITTLE OR NO FINES

POORLY GRADED GRAVELS,

GRAVEL-SAND MIXTURES WITH

LITTLE OR NO FINES

WELL-GRADED GRAVELS,

GRAVEL-SAND MIXTURES WITH

LITTLE FINES

WELL-GRADED GRAVELS,

GRAVEL-SAND MIXTURES WITH

LITTLE CLAY FINES

POORLY GRADED GRAVELS,

GRAVEL-SAND MIXTURES WITH

LITTLE FINES

POORLY GRADED GRAVELS,

GRAVEL-SAND MIXTURES WITH

LITTLE CLAY FINES
SANDS
WITH
5% TO
12%
FINES

SILTY GRAVELS, GRAVEL-SILT-SAND

MIXTURES

CLAYEY GRAVELS,

GRAVEL-SAND-CLAY-SILT MIXTURES

WELL-GRADED SANDS, SAND-GRAVEL

MIXTURES WITH LITTLE CLAY FINES
>
<
<
Cu 4 and
1 Cc 3

CLAYEY SANDS, SAND-GRAVEL-CLAY

MIXTURES
< _

ORGANIC SILTS & ORGANIC SILTY CLAYS

OF LOW PLASTICITY
Cu 6 and
1 Cc 3
SC-SM
SANDS
WITH >
12%
FINES
Direct Push

GEOPROBE SAMPLER

GRAB SAMPLE
GW-GC
Cu 4 and/
or 1 Cc 3
>
>

INORGANIC SILTS AND VERY FINE SANDS, SILTY OR

CLAYEY FINE SANDS, SILTS WITH SLIGHT PLASTICITY

ORGANIC CLAYS & ORGANIC SILTS OF

MEDIUM-TO-HIGH PLASTICITY

INORGANIC CLAYS OF HIGH PLASTICITY,

FAT CLAYS

INORGANIC SILTS, MICACEOUS OR

DIATOMACEOUS FINE SAND OR SILT

INORGANIC CLAYS-SILTS OF LOW PLASTICITY, GRAVELLY

CLAYS, SANDY CLAYS, SILTY CLAYS, LEAN CLAYS
_
SW-SM

WELL MATERIAL GRAPHICS
SAND

SOIL VAPOR PROBE

SOIL VAPOR PROBE IN SAND

SOIL VAPOR PROBE AND TUBING IN SAND

SOIL VAPOR TUBING IN BENTONITE CHIPS

SOIL VAPOR TUBING IN BENTONITE

SOIL VAPOR TUBING IN CEMENT GROUT

SOIL VAPOR TUBING IN SAND

SOIL VAPOR TUBING IN BENTONITE

SOIL VAPOR TUBING IN BENTONITE CHIPS

SOIL VAPOR TUBING IN CEMENT GROUT

SOIL VAPOR TUBING IN SAND

SOIL VAPOR TUBING IN BENTONITE

SOIL VAPOR TUBING IN BENTONITE CHIPS

SOIL VAPOR TUBING IN CEMENT-GROUT

SOIL VAPOR TUBING IN SAND

WELL BACKFILL MATERIAL GRAPHICS

BENTONITE

BENTONITE CHIPS

CEMENT GROUT
SAND

GROUND WATER GRAPHICS

OBSERVED SEEPAGE
WATER LEVEL (level after exploration completion)
WATER LEVEL (level where first observed)
WATER LEVEL (additional levels after exploration)
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENV-LEG 1 (GRAPHICS KEY) WITH USCS] PLOTTED: 10/13/2021 12:00 PM BY: LDandridge DATE:

CHECKED BY:

DRAWN BY:
20201678.001A
PROJECT NO.:
100%
80%
80%
100%
KB-1-2.5
KB-1-5
KB-1-10
KB-1-15
KB-1-20
KB-1-25
Asphalt Concrete (approximately 7 in. to 8 in. thick)
Silty SAND (SM): fine-grained, few coarse-grained, brown, moist, trace to few fine and coarse gravel Sandy CLAY (CL): fine-grained, few coarse-grained, brown, moist, low plasticity Silty SAND (SM): fine-grained, trace coarse-grained, dark brown, moist, trace to few fine and coarse gravel Sandy CLAY (CL): fine-grained, trace coarse-grained, dark brown, moist, low plasticity Clayey SAND (SC): fine-grained, dark brown, moist, low plasticity Silty SAND (SM): fine-grained, yellowish brown, moist
Poorly Graded SAND with Gravel (SP): fine-grained, little medium- to coarse-grained, yellowish brown, moist, few to little fine and coarse gravel
Well Graded SAND (SW): fine- to coarse-grained, light brown, moist, few to little fine and coarse gravel CLAY (CL): yellowish brown, moist to wet, low plasticity Clayey SILT (CL-ML): yellowish brown, wet, low plasticity Well Graded SAND (SW): fine- to coarse-grained, light brown, wet CLAY (CL): yellowish brown, moist to wet, iron oxide staining Sandy CLAY (CL): fine-grained, olive brown, moist to wet, micaceous, low plasticity CLAY (CL): olive brown, moist, high plasticity
The exploration was terminated at 25 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

0.8 4.2

0.3 1.0

1.4 0.1
Groundwater was observed at approximately 19.6 feet below ground surface after drilling.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was backfilled wiht Portland cement mixed with approximately 5-percent bentonite.

Hand Auger Direct Push
Recovery
(NR=No Recovery)

FIELD EXPLORATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID / FID (ppmv)
B-2
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

Not Available Drilling Equipment:
9/09/2021
BORE KB-1 LOG
Sunny
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
25 30
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
BORE KB-1 LOG
Sample Type
PLOTTED: 10/06/2021 04:38 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
100%
100%
100%
100%
KB-2-2.5
KB-2-5
KB-2-10
KB-2-15
KB-2-20
KB-2-25
Asphalt Concrete (approximately 5 in. to 6 in. thick)
Sandy CLAY (CL): fine-grained, few coarse-grained, dark brown, moist Sandy CLAY with Gravel (CL): reddish brown, fine and coarse gravel Silty SAND (SM): fine- to coarse-grained, dark brown, moist, little fine and coarse gravel, piece of concrete Silty Clayey SAND (SC-SM): fine-grained, little medium- to coarse-grained, dark brown, moist CLAY (CL): olive brown, moist, iron oxide staining, low plasticity Silty SAND (SM): fine-grained, yellowish brown, moist
Poorly Graded SAND (SP): fine-grained, yellowish brown, moist Well Graded SAND with Gravel (SW): fine- to coarse-grained, yellowish brown, moist, little fine and coarse gravel cobble
Gravelly SAND (SW): fine- to coarse-grained, yellowish brown, dry to moist, some fine and coarse gravel CLAY (CL): olive brown, moist, soft, high plasticity
Sandy SILT (ML): fine-grained, olive brown, moist, micaceous Sandy CLAY (CL): olive brown, moist to wet, little fine-grained sand, low plasticity Silty Clayey SAND (SC-SM): fine- to coarse-grained, yellowish brown, moist powdered rock in sampler
The exploration was terminated at 25 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

2.0 2.4

0.0 0.5

0.2 4.4
Groundwater was observed at approximately 19.78 feet below ground surface after drilling.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was backfilled wiht Portland cement mixed with approximately 5-percent bentonite.

Hand Auger Direct Push
Recovery
(NR=No Recovery)

FIELD EXPLORATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID / FID (ppmv)
B-3
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

Not Available Drilling Equipment:
9/09/2021
Sunny
BORE KB-2 LOG
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
25 30
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
BORE KB-2 LOG
Sample Type
PLOTTED: 10/06/2021 04:38 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
100%
90%
100%
60%
KB-3-2.5
KB-3-5
KB-3-10
KB-3-15
KB-3-20
KB-3-25
Asphalt Concrete (approximately 7 in. to 8 in. thick)
Silty SAND with Gravel (SM): fine- to coarse-grained, brown, dry to moist, few to little fine and coarse gravel Sandy CLAY (CL): little fine- to coarse-grained, dark brown, moist, thin clayey sand interbeds CLAY (CL): brown, moist, hard, low plasticity
Sandy CLAY (CL): fine-grained, olive brown, moist
Clayey SAND (SC): fine- to coarse-grained, dark brown, moist, low plasticity, few to little fine gravel CLAY (CL): olive brown, moist, low plasticity
Sandy SILT (ML): fine-grained, olive brown, moist
Silty SAND (SM): fine-grained, yellowish brown, moist
Poorly Graded SAND (SP): fine-grained, few to little medium- to coarse-grained, light brown, moist, trace fine gravel medium- to coarse-grained
CLAY (CL): olive brown, moist, medium plasticity
Clayey SAND (SC): fine-grained, olive brown, moist to wet, iron oxide staining Gravelly SAND (SW): fine- to coarse-grained, light grayish brown, moist, fine and coarse gravel Well Graded SAND (SW): fine- to coarse-grained, olive brown, moist, trace to few fine and coarse gravel little gravel
Silty SAND (SM): fine-grained, olive brown, moist, some clay Silty Clayey SAND (SC-SM): fine-grained, brown to olive brown, wet The exploration was terminated at 25 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

0.5 0.7

0.7 0.7

2.7 0.1
Groundwater was observed at approximately 20.57 feet below ground surface after drilling.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was backfilled wiht Portland cement mixed with approximately 5-percent bentonite.

Hand Auger Direct Push
Recovery
(NR=No Recovery)

FIELD EXPLORATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID / FID (ppmv)
B-4
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

Not Available Drilling Equipment:
9/10/2021
Sunny
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
25 30
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
BORE KB-3 LOG
BORE KB-3 LOG
Sample Type
PLOTTED: 10/06/2021 04:38 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
100%
100%
100%
100%
KB-4-2.5
KB-4-5
KB-4-10
KB-4-15
KB-4-20
KB-4-25
Asphalt Concrete (approximately 1 foot thick)
Gravelly Silty SAND (SM): fine- to coarse-grained, dark brown, moist, fine and coarse gravel CLAY (CL): brown, moist, low plasticity
Sandy CLAY (CL): fine-grained, yellowish brown, moist
fine-grained, few medium- to coarse-graiend, brown to dark brown, moist to wet, medium plasticity Silty Clayey SAND (SC-SM): fine-grained, yellowish brown, moist CLAY (CL): olive brown, moist, high plasticity
Sandy SILT (ML): fine-grained, yellowish brown, moist
Silty SAND (SM): fine-grained, yellowish brown, moist
Poorly Graded SAND (SP): fine-grained, interbedded layers of fine- to coarse-grained, olive brown to yellowish brown, moist
fine-grained, olive brown
Well Graded SAND (SW): fine- to coarse-grained, light yellowish brown, moist, few fine gravel Silty SAND (SM): fine-grained, few medium- to coarse-grained, light grayish brown, dry to moist, trace fine gravel Poorly Graded SAND (SP): fine-grained, trace medium- to coarse-grained, light grayish brown, moist Silty SAND (SM): fine-grained, yellowish brown, moist
Well Graded SAND (SW): fine- to coarse-grained, light yellowish brown, moist, little fine and coarse gravel CLAY (CL): olive brown, moist, high plasticity
Clayey SAND (SC): fine-grained, olive brown, wet, iron oxidation Silty SAND (SM): fine-grained, yellowish brown, wet
The exploration was terminated at 25 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

1.2 0.5

4.4 0.0

0.0 0.0
Groundwater was observed at approximately 19.71 feet below ground surface after drilling.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was backfilled wiht Portland cement mixed with approximately 5-percent bentonite.

Hand Auger Direct Push
Recovery
(NR=No Recovery)

FIELD EXPLORATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID / FID (ppmv)
B-5
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

BORE KB-4 LOG
Not Available Drilling Equipment:
9/10/2021
Sunny
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
25 30
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
BORE KB-4 LOG
Sample Type
PLOTTED: 10/06/2021 04:38 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
SOIL VAPOR PROBE KVP-1 LOG
SOIL VAPOR PROBE KVP-1 LOG
100%
100%
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Dry bentonite granules
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Asphalt Concrete (approximately 7 in. to 8 in. thick)
Not logged
Sandy CLAY (CL): fine-grained, few coarse-grained, brown to dark brown, moist, few fine and coarse gravel
Silty SAND (SM): fine-grained, yellowish brown, moist, trace to few fine and coarse gravel
fine- to coarse-grained, trace fine gravel
hard (liner jammed)
Well Graded SAND (SW): fine- to coarse-grained, light brown, dry, fine and coarse gravel

0.25-in. OD Nylaflow tubing
Vapor probe implant
Vapor probe implant
The exploration was terminated at 15.5 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

Groundwater was not observed during drilling or after completion.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was converted to a dual-nested soil vapor probe, which was left in place for potential resampling
Hand Auger Direct Push
Recovery
(NR=No Recovery)

FIELD EXPLORATION SOIL VAPOR PROBE INSTALLATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID (ppmv)
B-6
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

Not Available Drilling Equipment:
9/09/2021
Sunny
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
Sample Type
PLOTTED: 10/06/2021 04:38 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
100%
100%
Portland cement grout
containing approximately
5-percent bentonite by dry
weight
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Dry bentonite granules
Portland cement grout
containing approximately
5-percent bentonite by dry
weight
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Asphalt Concrete (approximately 5 in. to 6 in. thick)
Sandy CLAY (CL): fine-grained, few coarse-grained, dark brown, moist
Clayey SAND with Gravel (SC): fine-grained, few medium- to coarse-grained, dark brown, moist, few fine gravel
fine and coarse gravel
Silty SAND with Clay (SM): fine-grained, little medium- to coarse-grained, dark brown, moist, few gravel
CLAY (CL): olive brown, moist, iron oxide staining, low plasticity Sandy SILT (ML): very fine-grained, olive brown, moist, iron oxidation staining
Well Graded SAND (SW): fine- to coarse-grained, ligh brown, moist, fine and coarse gravel

0.25-in. OD Nylaflow tubing
Vapor probe implant
Vapor probe implant
The exploration was terminated at 15.5 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

Groundwater was not observed during drilling or after completion.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was converted to a dual-nested soil vapor probe, which was left in place for potential resampling
Hand Auger Direct Push
Recovery
(NR=No Recovery)

FIELD EXPLORATION SOIL VAPOR PROBE INSTALLATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID (ppmv)
B-7
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

Not Available Drilling Equipment:
9/09/2021
Sunny
Drilling Company:

SOIL VAPOR PROBE KVP-2 LOG
Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
SOIL VAPOR PROBE KVP-2 LOG
Sample Type
PLOTTED: 10/06/2021 04:39 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
Recovery
(NR=No Recovery)

FIELD EXPLORATION SOIL VAPOR PROBE INSTALLATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

Portland cement grout
containing approximately
5-percent bentonite by dry
weight
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Not logged

0.25-in. OD Nylaflow tubing
Vapor probe implant
The exploration was terminated at 5.5 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

Groundwater was not observed during drilling or after completion.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was converted to a dual-nested soil vapor probe, which was left in place for potential resampling
Hand Auger

ATTACHMENT
Graphical Log
PID (ppmv)
B-8
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

Not Available Drilling Equipment:
9/10/2021
Sunny
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade
3 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
SOIL VAPOR PROBE KVP-3-5 LOG
SOIL VAPOR PROBE KVP-3-5 LOG
Sample Type
PLOTTED: 10/06/2021 04:39 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
Portland cement grout
containing approximately
5-percent bentonite by dry
weight
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Asphalt Concrete (approximately 6 in. to 8 in. thick)
Not logged
Sandy CLAY (CL): fine-grained, brown to dark brown, moist, hard, low plasticity
Clayey SAND (SC): fine-grained, dark brown, moist
Sandy CLAY (CL): fine-grained, dark brown, moist, low plasticity Sandy SILT (ML): fine-grained, olive brown, moist, micaceous Well Graded SAND (SW): fine- to coarse-grained, yellowish brown, moist, trace to few fine gravel

0.25-in. OD Nylaflow tubing
Vapor probe implant
The exploration was terminated at 15.5 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

Groundwater was not observed during drilling or after completion.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was converted to a dual-nested soil vapor probe, which was left in place for potential resampling
Hand Auger Direct Push
100%
100%
Recovery
(NR=No Recovery)

FIELD EXPLORATION SOIL VAPOR PROBE INSTALLATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID (ppmv)
B-9
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

Not Available Drilling Equipment:
9/10/2021
Sunny
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
SOIL VAPOR PROBE KVP-3-15 LOG
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
SOIL VAPOR PROBE KVP-3-15 LOG
Sample Type
PLOTTED: 10/06/2021 04:39 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
Not Available Drilling Equipment:
9/10/2021
Sunny
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
100%
100%
100%
Portland cement grout
containing approximately
5-percent bentonite by dry
weight
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Dry bentonite granules
Portland cement grout
containing approximately
5-percent bentonite by dry
weight
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Asphalt Concrete (approximately 1 foot thick)
Not logged
CLAY (CL): olive brown, moist, hard, low plasticity
Silty Clayey SAND (SC-SM): fine-grained, trace medium- to coarse-grained, brown to yellowish brown, moist
CLAY (CL): olive brown, moist, hard, low plasticity
Clayey SAND (SC): fine-grained, yellowish brown, moist
Silty SAND (SM): fine-grained, yellowish brown to grayish brown, moist
Sandy SILT (ML): fine-grained, yellowish brown, moist
Well Graded SAND (SW): fine- to coarse-grained, yellowish brown to light grayish brown, moist, some fine and coarse gravel Poorly Graded SAND (SP): fine-grained, light grayish brown, dry to moist

0.25-inch OD Nylaflow tubing
Vapor probe implant
Vapor probe implant
The exploration was terminated at 16 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

Groundwater was not observed during drilling or after completion.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was converted to a dual-nested soil vapor probe, which was left in place for potential resampling
Hand Auger Direct Push
Recovery
(NR=No Recovery)

FIELD EXPLORATION SOIL VAPOR PROBE INSTALLATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID (ppmv)
B-10
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

SOIL VAPOR PROBE KVP-4 LOG
SOIL VAPOR PROBE KVP-4 LOG
PLOTTED: 10/06/2021 04:39 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A
Sample Type
100%
100%
100%
Portland cement grout
containing approximately
5-percent bentonite by dry
weight
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Dry bentonite granules
Portland cement grout
containing approximately
5-percent bentonite by dry
weight
Hydrated bentonite granules
Dry bentonite granules
No. 3 Monterey sand
Asphalt Concrete (approximately 1 foot thick)
Silty SAND (SM): fine-grained, brown, moist
some clay
cobble, some gravel
Sandy CLAY (CL): fine-grained, dark olive brown, moist, low plasticity
Clayey SAND (SC): fine-grained, dark grayish brown, moist CLAY (CL): olive brown, moist, hard, low plasticity
Sandy CLAY (CL): fine-grained, olive brown, moist, iron oxide staining
Silty SAND (SM): fine-grained, olive brown, moist
Poorly Graded SAND interbedded with Well Graded SAND (SP):
fine- to coarse-grained, light yellowish brown, moist, few to little fine angular gravel
Poorly Graded SAND (SP): medium- to coarse-grained, few to little fine-grained, light grayish brown, moist, trace to few gravel, iron oxide staining

0.25-in. OD Nylaflow tubing
Vapor probe implant
Vapor probe implant
The exploration was terminated at 16 feet below ground surface.

GROUNDWATER LEVEL INFORMATION:

Groundwater was not observed during drilling or after completion.

GENERAL NOTES:

Soils were screened during drilling for total volatile organic vapors using a photo-ionization detector (PID) that was calibrated before use. ppmv = parts per million by volume.

O.D. = outer diameter.
in. = inches.
% = percent.

Bore was converted to a dual-nested soil vapor probe, which was left in place for potential resampling
Hand Auger Direct Push
Recovery
(NR=No Recovery)

FIELD EXPLORATION SOIL VAPOR PROBE INSTALLATION
Lithologic Description
Sample Number
Surface Condition: Asphalt Concrete
1 of 1PAGE:

ATTACHMENT
Graphical Log
PID (ppmv)
B-11
Logged By:

Date Begin - End:

Hor.-Vert. Datum:

Weather:

Not Available Drilling Equipment:
9/10/2021
Sunny
Drilling Company:

Bore Diameter:

Drill Crew:

Hand Auger/Direct Push
Plunge: -90 degrees
L. Dandridge-Perry
See Drilling Method Column
M. Guzman
Cascade

2.25 in. O.D.

Drilling Method:

Depth (feet)
5 10
15 20
Drilling Method
Proposed Costco Wholesale Gasoline Station
13431 and 13455 Washington Blvd
Culver City, CA 90292
SOIL VAPOR PROBE KVP-5 LOG
SOIL VAPOR PROBE KVP-5 LOG
Sample Type
PLOTTED: 10/06/2021 04:39 PM BY: LDandridge
gINT FILE: Klf_gint_master_2021 PROJECT NUMBER: 20201678.001A OFFICE FILTER: LAGUNA HILLS gINT TEMPLATE: E:KLF_STANDARD_GINT_LIBRARY_2021.GLB [_KLF_ENVIRONMENTAL LOG] DATE: 10/6/2021
CHECKED BY: HV
DRAWN BY: LDP
PROJECT NO.:
20201678.001A

20201678.001A/LH21L131771 October 14, 2021
Copyright 2021 Kleinfelder

ATTACHMENT B

ANALYTICAL LABORATORY REPORTS

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

September 16, 2021
Kleinfelder
Lindsey Dandridge-Perry
Attention: Lindsey Dandridge-Perry
RE: Costco Culver City, 20201678.001A
Workorder No.:N047044FAX:

TEL: (949) 585-3133
24411 Ridge Route Dr. #225
Laguna Hills, CA 92653
Thank you for the opportunity to service the needs of your company.

Please feel free to call me at (562) 219-7435 if I can be of further assistance to your company.

Sincerely,
Andrew Garaniel
Laboratory Director
Enclosed are the results for sample(s) received on September 09, 2021 by ASSET Laboratories.

The sample(s) are tested for the parameters as indicated in the enclosed chain of custody in accordance with the applicable laboratory certifications.

The cover letter is an integral part of this analytical report. This Laboratory Report cannot be reproduced in part or in its entirety without written permission from the client and ASSET Laboratories - California. 1 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

16-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Lab Order: N047044

CASE NARRATIVE
SAMPLE RECEIVING/GENERAL COMMENTS:

All sample containers were received intact with proper chain of custody documentation.

Information on sample receipt conditions including discrepancies can be found in attached Sample Receipt Checklist Form.

Cooler temperature and sample preservation were verified upon receipt of samples if applicable.

Samples were analyzed within method holding time.

Results were J-Flag. "J" is used to flag those results that are between the PQL (Practical Quantitation Limit) and the calculated MDL (Method Detection Limit). Results that are "J" Flagged are estimated values since it becomes difficult to accurately quantitate the analyte near the MDL.

Analytical comments for EPA 6010B:

Matrix Spike (MS) and Matrix Spike Duplicate (MSD) are outside recovery criteria on some analytes possibly due to matrix interference. The associated Laboratory Control Sample (LCS) recovery was acceptable.

Analytical comments for EPA 7471A:

Matrix Spike (MS) and Matrix Spike Duplicate (MSD) are outside recovery criteria possibly due to matrix interference. The associated Laboratory Control Sample (LCS) recovery was acceptable. 2 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

16-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Lab Order: N047044
Work Order Sample Summary
Lab Sample ID Client Sample ID Collection DateMatrix Date Received Contract No:

Date Reported
N047044-001AKB-1-2.5 9/9/2021 8:30:00 AM 9/9/2021 9/16/2021Soil N047044-002AKB-1-5 9/9/2021 8:55:00 AM 9/9/2021 9/16/2021Soil N047044-002BKB-1-5 9/9/2021 8:55:00 AM 9/9/2021 9/16/2021Soil N047044-002CKB-1-5 9/9/2021 8:55:00 AM 9/9/2021 9/16/2021Soil N047044-002DKB-1-5 9/9/2021 8:55:00 AM 9/9/2021 9/16/2021Soil N047044-002EKB-1-5 9/9/2021 8:55:00 AM 9/9/2021 9/16/2021Soil N047044-002FKB-1-5 9/9/2021 8:55:00 AM 9/9/2021 9/16/2021Soil N047044-003AKB-1-10 9/9/2021 9:08:00 AM 9/9/2021 9/16/2021Soil N047044-004AKB-1-15 9/9/2021 9:30:00 AM 9/9/2021 9/16/2021Soil N047044-004BKB-1-15 9/9/2021 9:30:00 AM 9/9/2021 9/16/2021Soil N047044-004CKB-1-15 9/9/2021 9:30:00 AM 9/9/2021 9/16/2021Soil N047044-004DKB-1-15 9/9/2021 9:30:00 AM 9/9/2021 9/16/2021Soil N047044-004EKB-1-15 9/9/2021 9:30:00 AM 9/9/2021 9/16/2021Soil N047044-004FKB-1-15 9/9/2021 9:30:00 AM 9/9/2021 9/16/2021Soil N047044-005AKB-1-20 9/9/2021 9:36:00 AM 9/9/2021 9/16/2021Soil N047044-005BKB-1-20 9/9/2021 9:36:00 AM 9/9/2021 9/16/2021Soil N047044-005CKB-1-20 9/9/2021 9:36:00 AM 9/9/2021 9/16/2021Soil N047044-005DKB-1-20 9/9/2021 9:36:00 AM 9/9/2021 9/16/2021Soil N047044-005EKB-1-20 9/9/2021 9:36:00 AM 9/9/2021 9/16/2021Soil N047044-005FKB-1-20 9/9/2021 9:36:00 AM 9/9/2021 9/16/2021Soil N047044-006AKB-1-25 9/9/2021 9:41:00 AM 9/9/2021 9/16/2021Soil N047044-007AKB-2-2.5 9/9/2021 10:27:00 AM 9/9/2021 9/16/2021Soil N047044-007BKB-2-2.5 9/9/2021 10:27:00 AM 9/9/2021 9/16/2021Soil N047044-007CKB-2-2.5 9/9/2021 10:27:00 AM 9/9/2021 9/16/2021Soil N047044-007DKB-2-2.5 9/9/2021 10:27:00 AM 9/9/2021 9/16/2021Soil N047044-007EKB-2-2.5 9/9/2021 10:27:00 AM 9/9/2021 9/16/2021Soil N047044-007FKB-2-2.5 9/9/2021 10:27:00 AM 9/9/2021 9/16/2021Soil N047044-008AKB-2-5 9/9/2021 10:43:00 AM 9/9/2021 9/16/2021Soil N047044-008BKB-2-5 9/9/2021 10:43:00 AM 9/9/2021 9/16/2021Soil 3 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Lab Order: N047044
Work Order Sample Summary
Lab Sample ID Client Sample ID Collection DateMatrix Date Received Contract No:

Date Reported
N047044-008CKB-2-5 9/9/2021 10:43:00 AM 9/9/2021 9/16/2021Soil N047044-008DKB-2-5 9/9/2021 10:43:00 AM 9/9/2021 9/16/2021Soil N047044-008EKB-2-5 9/9/2021 10:43:00 AM 9/9/2021 9/16/2021Soil N047044-008FKB-2-5 9/9/2021 10:43:00 AM 9/9/2021 9/16/2021Soil N047044-009AKB-2-10 9/9/2021 11:18:00 AM 9/9/2021 9/16/2021Soil N047044-010AKB-2-15 9/9/2021 11:24:00 AM 9/9/2021 9/16/2021Soil N047044-011AKB-2-20 9/9/2021 11:35:00 AM 9/9/2021 9/16/2021Soil N047044-012AKB-2-25 9/9/2021 11:45:00 AM 9/9/2021 9/16/2021Soil N047044-012BKB-2-25 9/9/2021 11:45:00 AM 9/9/2021 9/16/2021Soil N047044-012CKB-2-25 9/9/2021 11:45:00 AM 9/9/2021 9/16/2021Soil N047044-012DKB-2-25 9/9/2021 11:45:00 AM 9/9/2021 9/16/2021Soil N047044-012EKB-2-25 9/9/2021 11:45:00 AM 9/9/2021 9/16/2021Soil N047044-012FKB-2-25 9/9/2021 11:45:00 AM 9/9/2021 9/16/2021Soil 4 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-5
Collection Date: 9/9/2021 8:55:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-002
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210910A R21VS050QC Batch: PrepDate: 9/10/2021 1,1,1,2-Tetrachloroethane 3.8 µg/Kg 1ND 0.39 9/10/2021 07:02 PM 1,1,1-Trichloroethane 3.8 µg/Kg 1ND 0.30 9/10/2021 07:02 PM 1,1,2,2-Tetrachloroethane 3.8 µg/Kg 1ND 0.17 9/10/2021 07:02 PM 1,1,2-Trichloroethane 3.8 µg/Kg 1ND 0.35 9/10/2021 07:02 PM 1,1-Dichloroethane 3.8 µg/Kg 1ND 0.33 9/10/2021 07:02 PM 1,1-Dichloroethene 3.8 µg/Kg 1ND 0.24 9/10/2021 07:02 PM 1,1-Dichloropropene 3.8 µg/Kg 1ND 0.24 9/10/2021 07:02 PM 1,2,3-Trichlorobenzene 3.8 µg/Kg 1ND 0.15 9/10/2021 07:02 PM 1,2,3-Trichloropropane 3.8 µg/Kg 1ND 0.35 9/10/2021 07:02 PM 1,2,4-Trichlorobenzene 3.8 µg/Kg 1ND 0.14 9/10/2021 07:02 PM 1,2,4-Trimethylbenzene 3.8 µg/Kg 1ND 0.091 9/10/2021 07:02 PM 1,2-Dibromo-3-chloropropane 7.6 µg/Kg 1ND 0.51 9/10/2021 07:02 PM 1,2-Dibromoethane 3.8 µg/Kg 1ND 0.28 9/10/2021 07:02 PM 1,2-Dichlorobenzene 3.8 µg/Kg 1ND 0.12 9/10/2021 07:02 PM 1,2-Dichloroethane 3.8 µg/Kg 1ND 0.25 9/10/2021 07:02 PM 1,2-Dichloropropane 3.8 µg/Kg 1ND 0.23 9/10/2021 07:02 PM 1,3,5-Trimethylbenzene 3.8 µg/Kg 1ND 0.42 9/10/2021 07:02 PM 1,3-Dichlorobenzene 3.8 µg/Kg 1ND 0.13 9/10/2021 07:02 PM 1,3-Dichloropropane 3.8 µg/Kg 1ND 0.20 9/10/2021 07:02 PM 1,4-Dichlorobenzene 3.8 µg/Kg 1ND 0.12 9/10/2021 07:02 PM 2,2-Dichloropropane 3.8 µg/Kg 1ND 0.29 9/10/2021 07:02 PM 2-Butanone J38 µg/Kg 18.5 7.1 9/10/2021 07:02 PM
2-Chlorotoluene 3.8 µg/Kg 1ND 0.13 9/10/2021 07:02 PM
4-Chlorotoluene 3.8 µg/Kg 1ND 0.10 9/10/2021 07:02 PM
4-Isopropyltoluene 3.8 µg/Kg 1ND 0.12 9/10/2021 07:02 PM Benzene 3.8 µg/Kg 1ND 0.16 9/10/2021 07:02 PM
Bromobenzene 3.8 µg/Kg 1ND 0.15 9/10/2021 07:02 PM
Bromodichloromethane 3.8 µg/Kg 1ND 0.31 9/10/2021 07:02 PM Bromoform 3.8 µg/Kg 1ND 0.35 9/10/2021 07:02 PM
Bromomethane 3.8 µg/Kg 1ND 0.68 9/10/2021 07:02 PM
Carbon tetrachloride 3.8 µg/Kg 1ND 0.49 9/10/2021 07:02 PM Chlorobenzene 3.8 µg/Kg 1ND 0.16 9/10/2021 07:02 PM
Chloroethane 3.8 µg/Kg 1ND 1.3 9/10/2021 07:02 PM
Chloroform 3.8 µg/Kg 1ND 0.60 9/10/2021 07:02 PM
Chloromethane 3.8 µg/Kg 1ND 0.35 9/10/2021 07:02 PM
cis-1,2-Dichloroethene 3.8 µg/Kg 1ND 0.16 9/10/2021 07:02 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 5 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-5
Collection Date: 9/9/2021 8:55:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-002
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210910A R21VS050QC Batch: PrepDate: 9/10/2021 cis-1,3-Dichloropropene 3.8 µg/Kg 1ND 0.24 9/10/2021 07:02 PM Di-isopropyl ether 3.8 µg/Kg 1ND 0.21 9/10/2021 07:02 PM Dibromochloromethane 3.8 µg/Kg 1ND 0.34 9/10/2021 07:02 PM Dibromomethane 3.8 µg/Kg 1ND 0.20 9/10/2021 07:02 PM
Dichlorodifluoromethane 3.8 µg/Kg 1ND 0.58 9/10/2021 07:02 PM Ethyl Tert-butyl ether 3.8 µg/Kg 1ND 0.17 9/10/2021 07:02 PM Ethylbenzene 3.8 µg/Kg 1ND 0.17 9/10/2021 07:02 PM
Freon-113 3.8 µg/Kg 1ND 0.41 9/10/2021 07:02 PM
Hexachlorobutadiene 3.8 µg/Kg 1ND 0.45 9/10/2021 07:02 PM Isopropylbenzene 3.8 µg/Kg 1ND 0.14 9/10/2021 07:02 PM
m,p-Xylene 7.6 µg/Kg 1ND 0.34 9/10/2021 07:02 PM
Methylene chloride 3.8 µg/Kg 1ND 2.7 9/10/2021 07:02 PM MTBE 3.8 µg/Kg 1ND 0.65 9/10/2021 07:02 PM
n-Butylbenzene 3.8 µg/Kg 1ND 0.15 9/10/2021 07:02 PM
n-Propylbenzene 3.8 µg/Kg 1ND 0.15 9/10/2021 07:02 PM
Naphthalene 3.8 µg/Kg 1ND 0.29 9/10/2021 07:02 PM
o-Xylene 3.8 µg/Kg 1ND 0.13 9/10/2021 07:02 PM
sec-Butylbenzene 3.8 µg/Kg 1ND 0.13 9/10/2021 07:02 PM
Styrene 3.8 µg/Kg 1ND 0.89 9/10/2021 07:02 PM
Tert-amyl methyl ether 3.8 µg/Kg 1ND 0.19 9/10/2021 07:02 PM Tert-Butanol 19 µg/Kg 1ND 4.9 9/10/2021 07:02 PM
tert-Butylbenzene 3.8 µg/Kg 1ND 0.15 9/10/2021 07:02 PM Tetrachloroethene 3.8 µg/Kg 1ND 0.38 9/10/2021 07:02 PM Toluene 3.8 µg/Kg 1ND 0.22 9/10/2021 07:02 PM
trans-1,2-Dichloroethene 3.8 µg/Kg 1ND 0.41 9/10/2021 07:02 PM Trichloroethene 3.8 µg/Kg 1ND 0.39 9/10/2021 07:02 PM
Trichlorofluoromethane 3.8 µg/Kg 1ND 0.43 9/10/2021 07:02 PM Vinyl chloride 3.8 µg/Kg 1ND 0.29 9/10/2021 07:02 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1134 0 9/10/2021 07:02 PM Surr: 4-Bromofluorobenzene 69-124 %REC 191.0 0 9/10/2021 07:02 PM Surr: Dibromofluoromethane 72-142 %REC 1120 0 9/10/2021 07:02 PM Surr: Toluene-d8 75-124 %REC 192.6 0 9/10/2021 07:02 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210914A 89280QC Batch: PrepDate: 9/14/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 6 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-5
Collection Date: 9/9/2021 8:55:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-002
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210914A 89280QC Batch: PrepDate: 9/14/2021 T/R Hydrocarbons: C13-C22 99 mg/Kg 10170 99 9/14/2021 03:10 PM T/R Hydrocarbons: C23-C40 99 mg/Kg 101800 99 9/14/2021 03:10 PM Surr: p-Terphenyl 56-133 %REC 1083.8 0 9/14/2021 03:10 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210910A Q21VS115QC Batch: PrepDate: 9/10/2021 GRO (C6 - C12) 0.79 mg/Kg 1ND 0.19 9/10/2021 11:26 AM
Surr: Chlorobenzene - d5 54-160 %REC 185.6 0 9/10/2021 11:26 AM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210910A 89235QC Batch: PrepDate: 9/10/2021 Mercury J0.10 mg/Kg 10.030 0.010 9/10/2021 01:05 PM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210911D 89234QC Batch: PrepDate: 9/10/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 10:50 PM
Arsenic 1.0 mg/Kg 12.8 0.54 9/13/2021 05:07 PM
Barium 1.0 mg/Kg 170 0.31 9/11/2021 10:50 PM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 10:50 PM
Cadmium J1.0 mg/Kg 10.54 0.27 9/11/2021 10:50 PM
Chromium 1.0 mg/Kg 120 0.32 9/13/2021 05:07 PM
Cobalt 1.0 mg/Kg 16.6 0.29 9/11/2021 10:50 PM
Copper 2.0 mg/Kg 117 0.89 9/11/2021 10:50 PM
Lead 1.0 mg/Kg 18.3 0.29 9/11/2021 10:50 PM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/11/2021 10:50 PM
Nickel 1.0 mg/Kg 113 0.34 9/11/2021 10:50 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 10:50 PM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 10:50 PM
Thallium 2.0 mg/Kg 1ND 0.35 9/11/2021 10:50 PM
Vanadium 1.0 mg/Kg 135 0.22 9/11/2021 10:50 PM
Zinc 1.0 mg/Kg 137 0.30 9/11/2021 10:50 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 7 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-15
Collection Date: 9/9/2021 9:30:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-004
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210910A R21VS050QC Batch: PrepDate: 9/10/2021 1,1,1,2-Tetrachloroethane 5.1 µg/Kg 1ND 0.53 9/10/2021 07:27 PM 1,1,1-Trichloroethane 5.1 µg/Kg 1ND 0.41 9/10/2021 07:27 PM 1,1,2,2-Tetrachloroethane 5.1 µg/Kg 1ND 0.23 9/10/2021 07:27 PM 1,1,2-Trichloroethane 5.1 µg/Kg 1ND 0.47 9/10/2021 07:27 PM 1,1-Dichloroethane 5.1 µg/Kg 1ND 0.45 9/10/2021 07:27 PM 1,1-Dichloroethene 5.1 µg/Kg 1ND 0.33 9/10/2021 07:27 PM 1,1-Dichloropropene 5.1 µg/Kg 1ND 0.33 9/10/2021 07:27 PM 1,2,3-Trichlorobenzene 5.1 µg/Kg 1ND 0.21 9/10/2021 07:27 PM 1,2,3-Trichloropropane 5.1 µg/Kg 1ND 0.48 9/10/2021 07:27 PM 1,2,4-Trichlorobenzene 5.1 µg/Kg 1ND 0.19 9/10/2021 07:27 PM 1,2,4-Trimethylbenzene 5.1 µg/Kg 1ND 0.12 9/10/2021 07:27 PM 1,2-Dibromo-3-chloropropane 10 µg/Kg 1ND 0.70 9/10/2021 07:27 PM 1,2-Dibromoethane 5.1 µg/Kg 1ND 0.38 9/10/2021 07:27 PM 1,2-Dichlorobenzene 5.1 µg/Kg 1ND 0.16 9/10/2021 07:27 PM 1,2-Dichloroethane 5.1 µg/Kg 1ND 0.33 9/10/2021 07:27 PM 1,2-Dichloropropane 5.1 µg/Kg 1ND 0.31 9/10/2021 07:27 PM 1,3,5-Trimethylbenzene 5.1 µg/Kg 1ND 0.57 9/10/2021 07:27 PM 1,3-Dichlorobenzene 5.1 µg/Kg 1ND 0.17 9/10/2021 07:27 PM 1,3-Dichloropropane 5.1 µg/Kg 1ND 0.27 9/10/2021 07:27 PM 1,4-Dichlorobenzene 5.1 µg/Kg 1ND 0.17 9/10/2021 07:27 PM 2,2-Dichloropropane 5.1 µg/Kg 1ND 0.40 9/10/2021 07:27 PM 2-Butanone 51 µg/Kg 1ND 9.6 9/10/2021 07:27 PM
2-Chlorotoluene 5.1 µg/Kg 1ND 0.18 9/10/2021 07:27 PM
4-Chlorotoluene 5.1 µg/Kg 1ND 0.14 9/10/2021 07:27 PM
4-Isopropyltoluene 5.1 µg/Kg 1ND 0.16 9/10/2021 07:27 PM Benzene 5.1 µg/Kg 1ND 0.22 9/10/2021 07:27 PM
Bromobenzene 5.1 µg/Kg 1ND 0.20 9/10/2021 07:27 PM
Bromodichloromethane 5.1 µg/Kg 1ND 0.42 9/10/2021 07:27 PM Bromoform 5.1 µg/Kg 1ND 0.47 9/10/2021 07:27 PM
Bromomethane 5.1 µg/Kg 1ND 0.92 9/10/2021 07:27 PM
Carbon tetrachloride 5.1 µg/Kg 1ND 0.66 9/10/2021 07:27 PM Chlorobenzene 5.1 µg/Kg 1ND 0.22 9/10/2021 07:27 PM
Chloroethane 5.1 µg/Kg 1ND 1.7 9/10/2021 07:27 PM
Chloroform 5.1 µg/Kg 1ND 0.81 9/10/2021 07:27 PM
Chloromethane 5.1 µg/Kg 1ND 0.47 9/10/2021 07:27 PM
cis-1,2-Dichloroethene 5.1 µg/Kg 1ND 0.21 9/10/2021 07:27 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 8 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-15
Collection Date: 9/9/2021 9:30:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-004
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210910A R21VS050QC Batch: PrepDate: 9/10/2021 cis-1,3-Dichloropropene 5.1 µg/Kg 1ND 0.33 9/10/2021 07:27 PM Di-isopropyl ether 5.1 µg/Kg 1ND 0.29 9/10/2021 07:27 PM Dibromochloromethane 5.1 µg/Kg 1ND 0.46 9/10/2021 07:27 PM Dibromomethane 5.1 µg/Kg 1ND 0.27 9/10/2021 07:27 PM
Dichlorodifluoromethane 5.1 µg/Kg 1ND 0.79 9/10/2021 07:27 PM Ethyl Tert-butyl ether 5.1 µg/Kg 1ND 0.23 9/10/2021 07:27 PM Ethylbenzene 5.1 µg/Kg 1ND 0.23 9/10/2021 07:27 PM
Freon-113 5.1 µg/Kg 1ND 0.56 9/10/2021 07:27 PM
Hexachlorobutadiene 5.1 µg/Kg 1ND 0.61 9/10/2021 07:27 PM Isopropylbenzene 5.1 µg/Kg 1ND 0.19 9/10/2021 07:27 PM
m,p-Xylene 10 µg/Kg 1ND 0.46 9/10/2021 07:27 PM
Methylene chloride 5.1 µg/Kg 1ND 3.7 9/10/2021 07:27 PM MTBE 5.1 µg/Kg 1ND 0.88 9/10/2021 07:27 PM
n-Butylbenzene 5.1 µg/Kg 1ND 0.20 9/10/2021 07:27 PM
n-Propylbenzene 5.1 µg/Kg 1ND 0.20 9/10/2021 07:27 PM
Naphthalene 5.1 µg/Kg 1ND 0.39 9/10/2021 07:27 PM
o-Xylene 5.1 µg/Kg 1ND 0.18 9/10/2021 07:27 PM
sec-Butylbenzene 5.1 µg/Kg 1ND 0.17 9/10/2021 07:27 PM
Styrene 5.1 µg/Kg 1ND 1.2 9/10/2021 07:27 PM
Tert-amyl methyl ether 5.1 µg/Kg 1ND 0.26 9/10/2021 07:27 PM Tert-Butanol 26 µg/Kg 1ND 6.7 9/10/2021 07:27 PM
tert-Butylbenzene 5.1 µg/Kg 1ND 0.21 9/10/2021 07:27 PM Tetrachloroethene 5.1 µg/Kg 1ND 0.51 9/10/2021 07:27 PM Toluene 5.1 µg/Kg 1ND 0.30 9/10/2021 07:27 PM
trans-1,2-Dichloroethene 5.1 µg/Kg 1ND 0.56 9/10/2021 07:27 PM Trichloroethene 5.1 µg/Kg 1ND 0.52 9/10/2021 07:27 PM
Trichlorofluoromethane 5.1 µg/Kg 1ND 0.59 9/10/2021 07:27 PM Vinyl chloride 5.1 µg/Kg 1ND 0.39 9/10/2021 07:27 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1133 0 9/10/2021 07:27 PM Surr: 4-Bromofluorobenzene 69-124 %REC 191.0 0 9/10/2021 07:27 PM Surr: Dibromofluoromethane 72-142 %REC 1119 0 9/10/2021 07:27 PM Surr: Toluene-d8 75-124 %REC 193.9 0 9/10/2021 07:27 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 9 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-15
Collection Date: 9/9/2021 9:30:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-004
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/10/2021 08:41 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 1ND 10 9/10/2021 08:41 PM Surr: p-Terphenyl 56-133 %REC 1108 0 9/10/2021 08:41 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210910A Q21VS115QC Batch: PrepDate: 9/10/2021 GRO (C6 - C12) 0.88 mg/Kg 1ND 0.22 9/10/2021 11:59 AM
Surr: Chlorobenzene - d5 54-160 %REC 185.8 0 9/10/2021 11:59 AM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210910A 89235QC Batch: PrepDate: 9/10/2021 Mercury J0.10 mg/Kg 10.048 0.010 9/10/2021 01:09 PM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210910F 89234QC Batch: PrepDate: 9/10/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/10/2021 11:23 PM
Arsenic 1.0 mg/Kg 1ND 0.54 9/10/2021 11:23 PM
Barium 1.0 mg/Kg 121 0.31 9/10/2021 11:23 PM
Beryllium 1.0 mg/Kg 1ND 0.22 9/10/2021 11:23 PM
Cadmium J1.0 mg/Kg 10.29 0.27 9/10/2021 11:23 PM
Chromium 1.0 mg/Kg 16.5 0.32 9/13/2021 05:51 PM
Cobalt 1.0 mg/Kg 13.3 0.29 9/11/2021 10:56 PM
Copper 2.0 mg/Kg 13.4 0.89 9/10/2021 11:23 PM
Lead J1.0 mg/Kg 10.77 0.30 9/10/2021 11:23 PM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/10/2021 11:23 PM
Nickel 1.0 mg/Kg 13.2 0.34 9/11/2021 10:56 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/10/2021 11:23 PM
Silver 1.0 mg/Kg 1ND 0.62 9/10/2021 11:23 PM
Thallium J2.0 mg/Kg 10.71 0.35 9/10/2021 11:23 PM
Vanadium 1.0 mg/Kg 125 0.22 9/10/2021 11:23 PM
Zinc 1.0 mg/Kg 112 0.30 9/11/2021 10:56 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 10 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-20
Collection Date: 9/9/2021 9:36:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-005
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210910A R21VS050QC Batch: PrepDate: 9/10/2021 1,1,1,2-Tetrachloroethane 4.6 µg/Kg 1ND 0.48 9/10/2021 06:38 PM 1,1,1-Trichloroethane 4.6 µg/Kg 1ND 0.37 9/10/2021 06:38 PM 1,1,2,2-Tetrachloroethane 4.6 µg/Kg 1ND 0.21 9/10/2021 06:38 PM 1,1,2-Trichloroethane 4.6 µg/Kg 1ND 0.43 9/10/2021 06:38 PM 1,1-Dichloroethane 4.6 µg/Kg 1ND 0.41 9/10/2021 06:38 PM 1,1-Dichloroethene 4.6 µg/Kg 1ND 0.30 9/10/2021 06:38 PM 1,1-Dichloropropene 4.6 µg/Kg 1ND 0.30 9/10/2021 06:38 PM 1,2,3-Trichlorobenzene 4.6 µg/Kg 1ND 0.19 9/10/2021 06:38 PM 1,2,3-Trichloropropane 4.6 µg/Kg 1ND 0.43 9/10/2021 06:38 PM 1,2,4-Trichlorobenzene 4.6 µg/Kg 1ND 0.18 9/10/2021 06:38 PM 1,2,4-Trimethylbenzene 4.6 µg/Kg 1ND 0.11 9/10/2021 06:38 PM 1,2-Dibromo-3-chloropropane 9.3 µg/Kg 1ND 0.63 9/10/2021 06:38 PM 1,2-Dibromoethane 4.6 µg/Kg 1ND 0.34 9/10/2021 06:38 PM 1,2-Dichlorobenzene 4.6 µg/Kg 1ND 0.15 9/10/2021 06:38 PM 1,2-Dichloroethane 4.6 µg/Kg 1ND 0.30 9/10/2021 06:38 PM 1,2-Dichloropropane 4.6 µg/Kg 1ND 0.28 9/10/2021 06:38 PM 1,3,5-Trimethylbenzene 4.6 µg/Kg 1ND 0.51 9/10/2021 06:38 PM 1,3-Dichlorobenzene 4.6 µg/Kg 1ND 0.16 9/10/2021 06:38 PM 1,3-Dichloropropane 4.6 µg/Kg 1ND 0.24 9/10/2021 06:38 PM 1,4-Dichlorobenzene 4.6 µg/Kg 1ND 0.15 9/10/2021 06:38 PM 2,2-Dichloropropane 4.6 µg/Kg 1ND 0.36 9/10/2021 06:38 PM 2-Butanone 46 µg/Kg 1ND 8.7 9/10/2021 06:38 PM
2-Chlorotoluene 4.6 µg/Kg 1ND 0.16 9/10/2021 06:38 PM
4-Chlorotoluene 4.6 µg/Kg 1ND 0.13 9/10/2021 06:38 PM
4-Isopropyltoluene 4.6 µg/Kg 1ND 0.14 9/10/2021 06:38 PM Benzene 4.6 µg/Kg 1ND 0.20 9/10/2021 06:38 PM
Bromobenzene 4.6 µg/Kg 1ND 0.18 9/10/2021 06:38 PM
Bromodichloromethane 4.6 µg/Kg 1ND 0.38 9/10/2021 06:38 PM Bromoform 4.6 µg/Kg 1ND 0.43 9/10/2021 06:38 PM
Bromomethane 4.6 µg/Kg 1ND 0.84 9/10/2021 06:38 PM
Carbon tetrachloride 4.6 µg/Kg 1ND 0.60 9/10/2021 06:38 PM Chlorobenzene 4.6 µg/Kg 1ND 0.20 9/10/2021 06:38 PM
Chloroethane 4.6 µg/Kg 1ND 1.5 9/10/2021 06:38 PM
Chloroform 4.6 µg/Kg 1ND 0.73 9/10/2021 06:38 PM
Chloromethane 4.6 µg/Kg 1ND 0.43 9/10/2021 06:38 PM
cis-1,2-Dichloroethene 4.6 µg/Kg 1ND 0.19 9/10/2021 06:38 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 11 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-20
Collection Date: 9/9/2021 9:36:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-005
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210910A R21VS050QC Batch: PrepDate: 9/10/2021 cis-1,3-Dichloropropene 4.6 µg/Kg 1ND 0.30 9/10/2021 06:38 PM Di-isopropyl ether 4.6 µg/Kg 1ND 0.26 9/10/2021 06:38 PM Dibromochloromethane 4.6 µg/Kg 1ND 0.41 9/10/2021 06:38 PM Dibromomethane 4.6 µg/Kg 1ND 0.25 9/10/2021 06:38 PM
Dichlorodifluoromethane 4.6 µg/Kg 1ND 0.72 9/10/2021 06:38 PM Ethyl Tert-butyl ether 4.6 µg/Kg 1ND 0.21 9/10/2021 06:38 PM Ethylbenzene 4.6 µg/Kg 1ND 0.21 9/10/2021 06:38 PM
Freon-113 4.6 µg/Kg 1ND 0.51 9/10/2021 06:38 PM
Hexachlorobutadiene 4.6 µg/Kg 1ND 0.55 9/10/2021 06:38 PM Isopropylbenzene 4.6 µg/Kg 1ND 0.17 9/10/2021 06:38 PM
m,p-Xylene 9.3 µg/Kg 1ND 0.42 9/10/2021 06:38 PM
Methylene chloride 4.6 µg/Kg 1ND 3.3 9/10/2021 06:38 PM MTBE 4.6 µg/Kg 1ND 0.80 9/10/2021 06:38 PM
n-Butylbenzene 4.6 µg/Kg 1ND 0.18 9/10/2021 06:38 PM
n-Propylbenzene 4.6 µg/Kg 1ND 0.18 9/10/2021 06:38 PM
Naphthalene 4.6 µg/Kg 1ND 0.35 9/10/2021 06:38 PM
o-Xylene 4.6 µg/Kg 1ND 0.16 9/10/2021 06:38 PM
sec-Butylbenzene 4.6 µg/Kg 1ND 0.16 9/10/2021 06:38 PM
Styrene 4.6 µg/Kg 1ND 1.1 9/10/2021 06:38 PM
Tert-amyl methyl ether 4.6 µg/Kg 1ND 0.24 9/10/2021 06:38 PM Tert-Butanol 23 µg/Kg 1ND 6.0 9/10/2021 06:38 PM
tert-Butylbenzene 4.6 µg/Kg 1ND 0.19 9/10/2021 06:38 PM Tetrachloroethene 4.6 µg/Kg 1ND 0.46 9/10/2021 06:38 PM Toluene 4.6 µg/Kg 1ND 0.27 9/10/2021 06:38 PM
trans-1,2-Dichloroethene 4.6 µg/Kg 1ND 0.50 9/10/2021 06:38 PM Trichloroethene 4.6 µg/Kg 1ND 0.47 9/10/2021 06:38 PM
Trichlorofluoromethane 4.6 µg/Kg 1ND 0.53 9/10/2021 06:38 PM Vinyl chloride 4.6 µg/Kg 1ND 0.35 9/10/2021 06:38 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1133 0 9/10/2021 06:38 PM Surr: 4-Bromofluorobenzene 69-124 %REC 190.7 0 9/10/2021 06:38 PM Surr: Dibromofluoromethane 72-142 %REC 1121 0 9/10/2021 06:38 PM Surr: Toluene-d8 75-124 %REC 196.2 0 9/10/2021 06:38 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 12 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1-20
Collection Date: 9/9/2021 9:36:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-005
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 T/R Hydrocarbons: C13-C22 9.9 mg/Kg 1ND 9.9 9/10/2021 09:10 PM T/R Hydrocarbons: C23-C40 9.9 mg/Kg 110 9.9 9/10/2021 09:10 PM Surr: p-Terphenyl 56-133 %REC 1115 0 9/10/2021 09:10 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210910A Q21VS115QC Batch: PrepDate: 9/10/2021 GRO (C6 - C12) 0.95 mg/Kg 1ND 0.23 9/10/2021 12:31 PM
Surr: Chlorobenzene - d5 54-160 %REC 194.2 0 9/10/2021 12:31 PM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210910A 89235QC Batch: PrepDate: 9/10/2021 Mercury J0.099 mg/Kg 10.027 0.0099 9/10/2021 01:19 PM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210910F 89234QC Batch: PrepDate: 9/10/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 01:05 AM
Arsenic 1.0 mg/Kg 1ND 0.54 9/11/2021 01:05 AM
Barium 1.0 mg/Kg 119 0.31 9/11/2021 01:05 AM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 01:05 AM
Cadmium 1.0 mg/Kg 1ND 0.27 9/11/2021 01:05 AM
Chromium 1.0 mg/Kg 14.7 0.32 9/13/2021 05:55 PM
Cobalt 1.0 mg/Kg 11.9 0.29 9/11/2021 11:02 PM
Copper 2.0 mg/Kg 13.2 0.89 9/11/2021 01:05 AM
Lead 1.0 mg/Kg 11.2 0.30 9/11/2021 01:05 AM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/11/2021 01:05 AM
Nickel 1.0 mg/Kg 14.2 0.34 9/11/2021 11:02 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 01:05 AM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 01:05 AM
Thallium J2.0 mg/Kg 10.88 0.35 9/11/2021 01:05 AM
Vanadium 1.0 mg/Kg 115 0.22 9/11/2021 01:05 AM
Zinc 1.0 mg/Kg 112 0.30 9/11/2021 11:02 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 13 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-2.5
Collection Date: 9/9/2021 10:27:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-007
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 4.1 µg/Kg 1ND 0.43 9/14/2021 01:02 PM 1,1,1-Trichloroethane 4.1 µg/Kg 1ND 0.33 9/14/2021 01:02 PM 1,1,2,2-Tetrachloroethane 4.1 µg/Kg 1ND 0.19 9/14/2021 01:02 PM 1,1,2-Trichloroethane 4.1 µg/Kg 1ND 0.38 9/14/2021 01:02 PM 1,1-Dichloroethane 4.1 µg/Kg 1ND 0.36 9/14/2021 01:02 PM 1,1-Dichloroethene 4.1 µg/Kg 1ND 0.27 9/14/2021 01:02 PM 1,1-Dichloropropene 4.1 µg/Kg 1ND 0.27 9/14/2021 01:02 PM 1,2,3-Trichlorobenzene 4.1 µg/Kg 1ND 0.17 9/14/2021 01:02 PM 1,2,3-Trichloropropane 4.1 µg/Kg 1ND 0.39 9/14/2021 01:02 PM 1,2,4-Trichlorobenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 01:02 PM 1,2,4-Trimethylbenzene 4.1 µg/Kg 1ND 0.099 9/14/2021 01:02 PM 1,2-Dibromo-3-chloropropane 8.3 µg/Kg 1ND 0.56 9/14/2021 01:02 PM 1,2-Dibromoethane 4.1 µg/Kg 1ND 0.30 9/14/2021 01:02 PM 1,2-Dichlorobenzene 4.1 µg/Kg 1ND 0.13 9/14/2021 01:02 PM 1,2-Dichloroethane 4.1 µg/Kg 1ND 0.27 9/14/2021 01:02 PM 1,2-Dichloropropane 4.1 µg/Kg 1ND 0.25 9/14/2021 01:02 PM 1,3,5-Trimethylbenzene 4.1 µg/Kg 1ND 0.46 9/14/2021 01:02 PM 1,3-Dichlorobenzene 4.1 µg/Kg 1ND 0.14 9/14/2021 01:02 PM 1,3-Dichloropropane 4.1 µg/Kg 1ND 0.22 9/14/2021 01:02 PM 1,4-Dichlorobenzene 4.1 µg/Kg 1ND 0.13 9/14/2021 01:02 PM 2,2-Dichloropropane 4.1 µg/Kg 1ND 0.32 9/14/2021 01:02 PM 2-Butanone J41 µg/Kg 110 7.7 9/14/2021 01:02 PM
2-Chlorotoluene 4.1 µg/Kg 1ND 0.14 9/14/2021 01:02 PM
4-Chlorotoluene 4.1 µg/Kg 1ND 0.11 9/14/2021 01:02 PM
4-Isopropyltoluene 4.1 µg/Kg 1ND 0.13 9/14/2021 01:02 PM Benzene 4.1 µg/Kg 1ND 0.18 9/14/2021 01:02 PM
Bromobenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 01:02 PM
Bromodichloromethane 4.1 µg/Kg 1ND 0.34 9/14/2021 01:02 PM Bromoform 4.1 µg/Kg 1ND 0.38 9/14/2021 01:02 PM
Bromomethane 4.1 µg/Kg 1ND 0.75 9/14/2021 01:02 PM
Carbon tetrachloride 4.1 µg/Kg 1ND 0.53 9/14/2021 01:02 PM Chlorobenzene 4.1 µg/Kg 1ND 0.18 9/14/2021 01:02 PM
Chloroethane 4.1 µg/Kg 1ND 1.4 9/14/2021 01:02 PM
Chloroform 4.1 µg/Kg 1ND 0.65 9/14/2021 01:02 PM
Chloromethane 4.1 µg/Kg 1ND 0.38 9/14/2021 01:02 PM
cis-1,2-Dichloroethene 4.1 µg/Kg 1ND 0.17 9/14/2021 01:02 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 14 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-2.5
Collection Date: 9/9/2021 10:27:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-007
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 4.1 µg/Kg 1ND 0.26 9/14/2021 01:02 PM Di-isopropyl ether 4.1 µg/Kg 1ND 0.23 9/14/2021 01:02 PM Dibromochloromethane 4.1 µg/Kg 1ND 0.37 9/14/2021 01:02 PM Dibromomethane 4.1 µg/Kg 1ND 0.22 9/14/2021 01:02 PM
Dichlorodifluoromethane 4.1 µg/Kg 1ND 0.64 9/14/2021 01:02 PM Ethyl Tert-butyl ether 4.1 µg/Kg 1ND 0.19 9/14/2021 01:02 PM Ethylbenzene 4.1 µg/Kg 1ND 0.18 9/14/2021 01:02 PM
Freon-113 4.1 µg/Kg 1ND 0.45 9/14/2021 01:02 PM
Hexachlorobutadiene 4.1 µg/Kg 1ND 0.49 9/14/2021 01:02 PM Isopropylbenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 01:02 PM
m,p-Xylene 8.3 µg/Kg 1ND 0.37 9/14/2021 01:02 PM
Methylene chloride 4.1 µg/Kg 1ND 3.0 9/14/2021 01:02 PM MTBE 4.1 µg/Kg 1ND 0.71 9/14/2021 01:02 PM
n-Butylbenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 01:02 PM
n-Propylbenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 01:02 PM
Naphthalene 4.1 µg/Kg 1ND 0.31 9/14/2021 01:02 PM
o-Xylene 4.1 µg/Kg 1ND 0.14 9/14/2021 01:02 PM
sec-Butylbenzene 4.1 µg/Kg 1ND 0.14 9/14/2021 01:02 PM
Styrene 4.1 µg/Kg 1ND 0.98 9/14/2021 01:02 PM
Tert-amyl methyl ether 4.1 µg/Kg 1ND 0.21 9/14/2021 01:02 PM Tert-Butanol 21 µg/Kg 1ND 5.4 9/14/2021 01:02 PM
tert-Butylbenzene 4.1 µg/Kg 1ND 0.17 9/14/2021 01:02 PM Tetrachloroethene 4.1 µg/Kg 1ND 0.41 9/14/2021 01:02 PM Toluene 4.1 µg/Kg 1ND 0.24 9/14/2021 01:02 PM
trans-1,2-Dichloroethene 4.1 µg/Kg 1ND 0.45 9/14/2021 01:02 PM Trichloroethene 4.1 µg/Kg 1ND 0.42 9/14/2021 01:02 PM
Trichlorofluoromethane 4.1 µg/Kg 1ND 0.48 9/14/2021 01:02 PM Vinyl chloride 4.1 µg/Kg 1ND 0.31 9/14/2021 01:02 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1131 0 9/14/2021 01:02 PM Surr: 4-Bromofluorobenzene 69-124 %REC 193.2 0 9/14/2021 01:02 PM Surr: Dibromofluoromethane 72-142 %REC 1120 0 9/14/2021 01:02 PM Surr: Toluene-d8 75-124 %REC 194.2 0 9/14/2021 01:02 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 15 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-2.5
Collection Date: 9/9/2021 10:27:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-007
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/10/2021 10:40 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 176 10 9/10/2021 10:40 PM Surr: p-Terphenyl 56-133 %REC 1112 0 9/10/2021 10:40 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210910A Q21VS115QC Batch: PrepDate: 9/10/2021 GRO (C6 - C12) 0.86 mg/Kg 1ND 0.21 9/10/2021 01:04 PM
Surr: Chlorobenzene - d5 54-160 %REC 188.3 0 9/10/2021 01:04 PM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210910A 89235QC Batch: PrepDate: 9/10/2021 Mercury J0.10 mg/Kg 10.027 0.010 9/10/2021 01:22 PM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210910F 89234QC Batch: PrepDate: 9/10/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 01:10 AM
Arsenic 1.0 mg/Kg 13.2 0.54 9/13/2021 05:59 PM
Barium 1.0 mg/Kg 174 0.31 9/11/2021 01:10 AM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 01:10 AM
Cadmium J1.0 mg/Kg 10.55 0.27 9/11/2021 01:10 AM
Chromium 1.0 mg/Kg 122 0.32 9/13/2021 05:59 PM
Cobalt 1.0 mg/Kg 16.6 0.29 9/13/2021 05:59 PM
Copper 2.0 mg/Kg 125 0.89 9/11/2021 01:10 AM
Lead 1.0 mg/Kg 154 0.30 9/11/2021 01:10 AM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/11/2021 01:10 AM
Nickel 1.0 mg/Kg 113 0.34 9/13/2021 05:59 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 01:10 AM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 01:10 AM
Thallium J2.0 mg/Kg 10.74 0.35 9/11/2021 01:10 AM
Vanadium 1.0 mg/Kg 135 0.22 9/11/2021 01:10 AM
Zinc 1.0 mg/Kg 141 0.30 9/13/2021 05:59 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 16 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-5
Collection Date: 9/9/2021 10:43:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-008
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 4.5 µg/Kg 1ND 0.46 9/14/2021 01:26 PM 1,1,1-Trichloroethane 4.5 µg/Kg 1ND 0.36 9/14/2021 01:26 PM 1,1,2,2-Tetrachloroethane 4.5 µg/Kg 1ND 0.20 9/14/2021 01:26 PM 1,1,2-Trichloroethane 4.5 µg/Kg 1ND 0.41 9/14/2021 01:26 PM 1,1-Dichloroethane 4.5 µg/Kg 1ND 0.39 9/14/2021 01:26 PM 1,1-Dichloroethene 4.5 µg/Kg 1ND 0.29 9/14/2021 01:26 PM 1,1-Dichloropropene 4.5 µg/Kg 1ND 0.29 9/14/2021 01:26 PM 1,2,3-Trichlorobenzene 4.5 µg/Kg 1ND 0.18 9/14/2021 01:26 PM 1,2,3-Trichloropropane 4.5 µg/Kg 1ND 0.42 9/14/2021 01:26 PM 1,2,4-Trichlorobenzene 4.5 µg/Kg 1ND 0.17 9/14/2021 01:26 PM 1,2,4-Trimethylbenzene 4.5 µg/Kg 1ND 0.11 9/14/2021 01:26 PM 1,2-Dibromo-3-chloropropane 9.0 µg/Kg 1ND 0.61 9/14/2021 01:26 PM 1,2-Dibromoethane 4.5 µg/Kg 1ND 0.33 9/14/2021 01:26 PM 1,2-Dichlorobenzene 4.5 µg/Kg 1ND 0.14 9/14/2021 01:26 PM 1,2-Dichloroethane 4.5 µg/Kg 1ND 0.29 9/14/2021 01:26 PM 1,2-Dichloropropane 4.5 µg/Kg 1ND 0.27 9/14/2021 01:26 PM 1,3,5-Trimethylbenzene 4.5 µg/Kg 1ND 0.50 9/14/2021 01:26 PM 1,3-Dichlorobenzene 4.5 µg/Kg 1ND 0.15 9/14/2021 01:26 PM 1,3-Dichloropropane 4.5 µg/Kg 1ND 0.23 9/14/2021 01:26 PM 1,4-Dichlorobenzene 4.5 µg/Kg 1ND 0.15 9/14/2021 01:26 PM 2,2-Dichloropropane 4.5 µg/Kg 1ND 0.35 9/14/2021 01:26 PM 2-Butanone 45 µg/Kg 1ND 8.4 9/14/2021 01:26 PM
2-Chlorotoluene 4.5 µg/Kg 1ND 0.15 9/14/2021 01:26 PM
4-Chlorotoluene 4.5 µg/Kg 1ND 0.12 9/14/2021 01:26 PM
4-Isopropyltoluene 4.5 µg/Kg 1ND 0.14 9/14/2021 01:26 PM Benzene 4.5 µg/Kg 1ND 0.19 9/14/2021 01:26 PM
Bromobenzene 4.5 µg/Kg 1ND 0.18 9/14/2021 01:26 PM
Bromodichloromethane 4.5 µg/Kg 1ND 0.37 9/14/2021 01:26 PM Bromoform 4.5 µg/Kg 1ND 0.42 9/14/2021 01:26 PM
Bromomethane 4.5 µg/Kg 1ND 0.81 9/14/2021 01:26 PM
Carbon tetrachloride 4.5 µg/Kg 1ND 0.58 9/14/2021 01:26 PM Chlorobenzene 4.5 µg/Kg 1ND 0.19 9/14/2021 01:26 PM
Chloroethane 4.5 µg/Kg 1ND 1.5 9/14/2021 01:26 PM
Chloroform 4.5 µg/Kg 1ND 0.71 9/14/2021 01:26 PM
Chloromethane 4.5 µg/Kg 1ND 0.41 9/14/2021 01:26 PM
cis-1,2-Dichloroethene 4.5 µg/Kg 1ND 0.19 9/14/2021 01:26 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 17 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-5
Collection Date: 9/9/2021 10:43:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-008
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 4.5 µg/Kg 1ND 0.29 9/14/2021 01:26 PM Di-isopropyl ether 4.5 µg/Kg 1ND 0.25 9/14/2021 01:26 PM Dibromochloromethane 4.5 µg/Kg 1ND 0.40 9/14/2021 01:26 PM Dibromomethane 4.5 µg/Kg 1ND 0.24 9/14/2021 01:26 PM
Dichlorodifluoromethane 4.5 µg/Kg 1ND 0.69 9/14/2021 01:26 PM Ethyl Tert-butyl ether 4.5 µg/Kg 1ND 0.20 9/14/2021 01:26 PM Ethylbenzene 4.5 µg/Kg 1ND 0.20 9/14/2021 01:26 PM
Freon-113 4.5 µg/Kg 1ND 0.49 9/14/2021 01:26 PM
Hexachlorobutadiene 4.5 µg/Kg 1ND 0.53 9/14/2021 01:26 PM Isopropylbenzene 4.5 µg/Kg 1ND 0.17 9/14/2021 01:26 PM
m,p-Xylene 9.0 µg/Kg 1ND 0.40 9/14/2021 01:26 PM
Methylene chloride 4.5 µg/Kg 1ND 3.2 9/14/2021 01:26 PM MTBE 4.5 µg/Kg 1ND 0.77 9/14/2021 01:26 PM
n-Butylbenzene 4.5 µg/Kg 1ND 0.17 9/14/2021 01:26 PM
n-Propylbenzene 4.5 µg/Kg 1ND 0.18 9/14/2021 01:26 PM
Naphthalene 4.5 µg/Kg 1ND 0.34 9/14/2021 01:26 PM
o-Xylene 4.5 µg/Kg 1ND 0.16 9/14/2021 01:26 PM
sec-Butylbenzene 4.5 µg/Kg 1ND 0.15 9/14/2021 01:26 PM
Styrene 4.5 µg/Kg 1ND 1.1 9/14/2021 01:26 PM
Tert-amyl methyl ether 4.5 µg/Kg 1ND 0.23 9/14/2021 01:26 PM Tert-Butanol 22 µg/Kg 1ND 5.8 9/14/2021 01:26 PM
tert-Butylbenzene 4.5 µg/Kg 1ND 0.18 9/14/2021 01:26 PM Tetrachloroethene 4.5 µg/Kg 1ND 0.45 9/14/2021 01:26 PM Toluene 4.5 µg/Kg 1ND 0.26 9/14/2021 01:26 PM
trans-1,2-Dichloroethene 4.5 µg/Kg 1ND 0.49 9/14/2021 01:26 PM Trichloroethene 4.5 µg/Kg 1ND 0.46 9/14/2021 01:26 PM
Trichlorofluoromethane 4.5 µg/Kg 1ND 0.52 9/14/2021 01:26 PM Vinyl chloride 4.5 µg/Kg 1ND 0.34 9/14/2021 01:26 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1131 0 9/14/2021 01:26 PM Surr: 4-Bromofluorobenzene 69-124 %REC 195.2 0 9/14/2021 01:26 PM Surr: Dibromofluoromethane 72-142 %REC 1120 0 9/14/2021 01:26 PM Surr: Toluene-d8 75-124 %REC 194.9 0 9/14/2021 01:26 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 18 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-5
Collection Date: 9/9/2021 10:43:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-008
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/10/2021 11:09 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 1110 10 9/10/2021 11:09 PM Surr: p-Terphenyl 56-133 %REC 1108 0 9/10/2021 11:09 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210910A Q21VS115QC Batch: PrepDate: 9/10/2021 GRO (C6 - C12) 0.88 mg/Kg 1ND 0.22 9/10/2021 01:37 PM
Surr: Chlorobenzene - d5 54-160 %REC 185.1 0 9/10/2021 01:37 PM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210910A 89235QC Batch: PrepDate: 9/10/2021 Mercury J0.10 mg/Kg 10.044 0.010 9/10/2021 01:26 PM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210910F 89234QC Batch: PrepDate: 9/10/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 01:16 AM
Arsenic 1.0 mg/Kg 11.9 0.54 9/13/2021 06:04 PM
Barium 1.0 mg/Kg 163 0.31 9/11/2021 01:16 AM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 01:16 AM
Cadmium J1.0 mg/Kg 10.48 0.27 9/11/2021 01:16 AM
Chromium 1.0 mg/Kg 120 0.32 9/13/2021 06:04 PM
Cobalt 1.0 mg/Kg 16.2 0.29 9/13/2021 06:04 PM
Copper 2.0 mg/Kg 116 0.89 9/11/2021 01:16 AM
Lead 1.0 mg/Kg 18.4 0.29 9/11/2021 01:16 AM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/11/2021 01:16 AM
Nickel 1.0 mg/Kg 112 0.34 9/13/2021 06:04 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 01:16 AM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 01:16 AM
Thallium J2.0 mg/Kg 10.62 0.35 9/11/2021 01:16 AM
Vanadium 1.0 mg/Kg 135 0.22 9/11/2021 01:16 AM
Zinc 1.0 mg/Kg 134 0.30 9/13/2021 06:04 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 19 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-25
Collection Date: 9/9/2021 11:45:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-012
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 4.3 µg/Kg 1ND 0.45 9/14/2021 01:51 PM 1,1,1-Trichloroethane 4.3 µg/Kg 1ND 0.35 9/14/2021 01:51 PM 1,1,2,2-Tetrachloroethane 4.3 µg/Kg 1ND 0.20 9/14/2021 01:51 PM 1,1,2-Trichloroethane 4.3 µg/Kg 1ND 0.40 9/14/2021 01:51 PM 1,1-Dichloroethane 4.3 µg/Kg 1ND 0.38 9/14/2021 01:51 PM 1,1-Dichloroethene 4.3 µg/Kg 1ND 0.28 9/14/2021 01:51 PM 1,1-Dichloropropene 4.3 µg/Kg 1ND 0.28 9/14/2021 01:51 PM 1,2,3-Trichlorobenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 01:51 PM 1,2,3-Trichloropropane 4.3 µg/Kg 1ND 0.40 9/14/2021 01:51 PM 1,2,4-Trichlorobenzene 4.3 µg/Kg 1ND 0.16 9/14/2021 01:51 PM 1,2,4-Trimethylbenzene 4.3 µg/Kg 1ND 0.10 9/14/2021 01:51 PM 1,2-Dibromo-3-chloropropane 8.6 µg/Kg 1ND 0.59 9/14/2021 01:51 PM 1,2-Dibromoethane 4.3 µg/Kg 1ND 0.32 9/14/2021 01:51 PM 1,2-Dichlorobenzene 4.3 µg/Kg 1ND 0.14 9/14/2021 01:51 PM 1,2-Dichloroethane 4.3 µg/Kg 1ND 0.28 9/14/2021 01:51 PM 1,2-Dichloropropane 4.3 µg/Kg 1ND 0.26 9/14/2021 01:51 PM 1,3,5-Trimethylbenzene 4.3 µg/Kg 1ND 0.48 9/14/2021 01:51 PM 1,3-Dichlorobenzene 4.3 µg/Kg 1ND 0.15 9/14/2021 01:51 PM 1,3-Dichloropropane 4.3 µg/Kg 1ND 0.22 9/14/2021 01:51 PM 1,4-Dichlorobenzene 4.3 µg/Kg 1ND 0.14 9/14/2021 01:51 PM 2,2-Dichloropropane 4.3 µg/Kg 1ND 0.33 9/14/2021 01:51 PM 2-Butanone 43 µg/Kg 1ND 8.1 9/14/2021 01:51 PM
2-Chlorotoluene 4.3 µg/Kg 1ND 0.15 9/14/2021 01:51 PM
4-Chlorotoluene 4.3 µg/Kg 1ND 0.12 9/14/2021 01:51 PM
4-Isopropyltoluene 4.3 µg/Kg 1ND 0.13 9/14/2021 01:51 PM Benzene 4.3 µg/Kg 1ND 0.18 9/14/2021 01:51 PM
Bromobenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 01:51 PM
Bromodichloromethane 4.3 µg/Kg 1ND 0.35 9/14/2021 01:51 PM Bromoform 4.3 µg/Kg 1ND 0.40 9/14/2021 01:51 PM
Bromomethane 4.3 µg/Kg 1ND 0.78 9/14/2021 01:51 PM
Carbon tetrachloride 4.3 µg/Kg 1ND 0.56 9/14/2021 01:51 PM Chlorobenzene 4.3 µg/Kg 1ND 0.19 9/14/2021 01:51 PM
Chloroethane 4.3 µg/Kg 1ND 1.4 9/14/2021 01:51 PM
Chloroform 4.3 µg/Kg 1ND 0.68 9/14/2021 01:51 PM
Chloromethane 4.3 µg/Kg 1ND 0.40 9/14/2021 01:51 PM
cis-1,2-Dichloroethene 4.3 µg/Kg 1ND 0.18 9/14/2021 01:51 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 20 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-25
Collection Date: 9/9/2021 11:45:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-012
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 4.3 µg/Kg 1ND 0.28 9/14/2021 01:51 PM Di-isopropyl ether 4.3 µg/Kg 1ND 0.24 9/14/2021 01:51 PM Dibromochloromethane 4.3 µg/Kg 1ND 0.38 9/14/2021 01:51 PM Dibromomethane 4.3 µg/Kg 1ND 0.23 9/14/2021 01:51 PM
Dichlorodifluoromethane 4.3 µg/Kg 1ND 0.67 9/14/2021 01:51 PM Ethyl Tert-butyl ether 4.3 µg/Kg 1ND 0.19 9/14/2021 01:51 PM Ethylbenzene 4.3 µg/Kg 1ND 0.19 9/14/2021 01:51 PM
Freon-113 4.3 µg/Kg 1ND 0.47 9/14/2021 01:51 PM
Hexachlorobutadiene 4.3 µg/Kg 1ND 0.51 9/14/2021 01:51 PM Isopropylbenzene 4.3 µg/Kg 1ND 0.16 9/14/2021 01:51 PM
m,p-Xylene 8.6 µg/Kg 1ND 0.39 9/14/2021 01:51 PM
Methylene chloride 4.3 µg/Kg 1ND 3.1 9/14/2021 01:51 PM MTBE 4.3 µg/Kg 1ND 0.74 9/14/2021 01:51 PM
n-Butylbenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 01:51 PM
n-Propylbenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 01:51 PM
Naphthalene 4.3 µg/Kg 1ND 0.33 9/14/2021 01:51 PM
o-Xylene 4.3 µg/Kg 1ND 0.15 9/14/2021 01:51 PM
sec-Butylbenzene 4.3 µg/Kg 1ND 0.15 9/14/2021 01:51 PM
Styrene 4.3 µg/Kg 1ND 1.0 9/14/2021 01:51 PM
Tert-amyl methyl ether 4.3 µg/Kg 1ND 0.22 9/14/2021 01:51 PM Tert-Butanol 22 µg/Kg 1ND 5.6 9/14/2021 01:51 PM
tert-Butylbenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 01:51 PM Tetrachloroethene 4.3 µg/Kg 1ND 0.43 9/14/2021 01:51 PM Toluene 4.3 µg/Kg 1ND 0.25 9/14/2021 01:51 PM
trans-1,2-Dichloroethene 4.3 µg/Kg 1ND 0.47 9/14/2021 01:51 PM Trichloroethene 4.3 µg/Kg 1ND 0.44 9/14/2021 01:51 PM
Trichlorofluoromethane 4.3 µg/Kg 1ND 0.50 9/14/2021 01:51 PM Vinyl chloride 4.3 µg/Kg 1ND 0.33 9/14/2021 01:51 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1124 0 9/14/2021 01:51 PM Surr: 4-Bromofluorobenzene 69-124 %REC 193.8 0 9/14/2021 01:51 PM Surr: Dibromofluoromethane 72-142 %REC 1114 0 9/14/2021 01:51 PM Surr: Toluene-d8 75-124 %REC 197.3 0 9/14/2021 01:51 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 21 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2-25
Collection Date: 9/9/2021 11:45:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047044
Lab ID: N047044-012
ASSET Laboratories Print Date: 16-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: MCC
EPA 3550B
RunID: NV00922-GC1_210910B 89240QC Batch: PrepDate: 9/10/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/10/2021 10:10 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 129 10 9/10/2021 10:10 PM Surr: p-Terphenyl 56-133 %REC 1108 0 9/10/2021 10:10 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210910A Q21VS115QC Batch: PrepDate: 9/10/2021 GRO (C6 - C12) J0.81 mg/Kg 10.21 0.20 9/10/2021 02:10 PM Surr: Chlorobenzene - d5 54-160 %REC 188.0 0 9/10/2021 02:10 PM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210910A 89235QC Batch: PrepDate: 9/10/2021 Mercury J0.10 mg/Kg 10.067 0.010 9/10/2021 01:29 PM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210910F 89234QC Batch: PrepDate: 9/10/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 01:22 AM
Arsenic 1.0 mg/Kg 1ND 0.54 9/11/2021 01:22 AM
Barium 1.0 mg/Kg 136 0.31 9/11/2021 01:22 AM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 01:22 AM
Cadmium J1.0 mg/Kg 10.34 0.27 9/11/2021 01:22 AM
Chromium 1.0 mg/Kg 113 0.32 9/13/2021 06:08 PM
Cobalt 1.0 mg/Kg 13.5 0.29 9/11/2021 11:19 PM
Copper 2.0 mg/Kg 15.7 0.89 9/11/2021 01:22 AM
Lead 1.0 mg/Kg 11.7 0.30 9/11/2021 01:22 AM
Molybdenum 1.0 mg/Kg 11.2 0.30 9/11/2021 11:19 PM
Nickel 1.0 mg/Kg 15.9 0.34 9/11/2021 11:19 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 01:22 AM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 01:22 AM
Thallium J2.0 mg/Kg 10.79 0.35 9/11/2021 01:22 AM
Vanadium 1.0 mg/Kg 120 0.22 9/11/2021 01:22 AM
Zinc 1.0 mg/Kg 116 0.30 9/11/2021 11:19 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 22 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

16-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_S
Sample ID: MB-89234
Batch ID: 89234 TestNo: EPA 6010B Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156592
SeqNo: 4345851
MBLKSampType: TestCode: 6010_S
EPA 3050B
Antimony 2.0ND
Beryllium 1.0ND
Cadmium 1.0ND
Chromium 1.0ND
Cobalt 1.0ND
Copper 2.0ND
Lead 1.0ND
Molybdenum 1.0ND
Nickel 1.0ND
Selenium 1.0ND
Silver 1.0ND
Thallium 2.0ND
Vanadium 1.0ND
Zinc 1.0ND
Sample ID: LCS-89234
Batch ID: 89234 TestNo: EPA 6010B Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156592
SeqNo: 4345852
LCSSampType: TestCode: 6010_S
EPA 3050B
Antimony 25.00 101 80 1202.0 025.182
Arsenic 25.00 99.3 80 1201.0 024.835
Barium 25.00 101 80 1201.0 025.148
Beryllium 25.00 101 80 1201.0 025.310
Cadmium 25.00 101 80 1201.0 025.237
Chromium 25.00 100 80 1201.0 025.088
Cobalt 25.00 96.5 80 1201.0 024.128
Copper 25.00 100 80 1202.0 025.113
Lead 25.00 102 80 1201.0 025.472
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 23 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_S
Sample ID: LCS-89234
Batch ID: 89234 TestNo: EPA 6010B Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156592
SeqNo: 4345852
LCSSampType: TestCode: 6010_S
EPA 3050B
Molybdenum 25.00 100 80 1201.0 025.062
Nickel 25.00 100 80 1201.0 025.090
Selenium 25.00 99.7 80 1201.0 024.913
Silver 25.00 100 80 1201.0 025.096
Thallium 25.00 99.3 80 1202.0 024.834
Vanadium 25.00 101 80 1201.0 025.301
Zinc 25.00 100 80 1201.0 025.105
Sample ID: N047043-001B-MS
Batch ID: 89234 TestNo: EPA 6010B Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg-dry
PQL
Client ID: ZZZZZZ
RunNo: 156592
SeqNo: 4345856
MSSampType: TestCode: 6010_S
EPA 3050B
Antimony 24.96 45.5 75 125 S2.0 011.358
Arsenic 24.96 60.8 75 125 S1.0 015.189
Barium 24.96 103 75 1251.0 54.7580.460
Beryllium 24.96 61.9 75 125 S1.0 015.445
Cadmium 24.96 64.7 75 125 S1.0 0.333216.472
Chromium 24.96 74.7 75 125 S1.0 14.4833.117
Cobalt 24.96 76.4 75 1251.0 7.11326.187
Copper 24.96 92.5 75 1252.0 14.3937.476
Lead 24.96 69.8 75 125 S1.0 5.49722.920
Molybdenum 24.96 69.2 75 125 S1.0 0.931918.203
Nickel 24.96 66.4 75 125 S1.0 14.0830.665
Selenium 24.96 56.8 75 125 S1.0 014.182
Silver 24.96 66.1 75 125 S1.0 016.502
Thallium 24.96 61.5 75 125 S2.0 0.460815.819
Vanadium 24.96 96.2 75 1251.0 29.1853.197
Zinc 24.96 62.2 75 125 S1.0 45.3060.835
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 24 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_S
Sample ID: N047043-001B-MSD
Batch ID: 89234 TestNo: EPA 6010B Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg-dry
PQL
Client ID: ZZZZZZ
RunNo: 156592
SeqNo: 4345857
MSDSampType: TestCode: 6010_S
EPA 3050B
Antimony 24.89 50.4 75 125 20 S2.0 0 11.36 9.9112.543
Arsenic 24.89 65.6 75 125 20 S1.0 0 15.19 7.2216.326
Barium 24.89 103 75 125 201.0 54.75 80.46 0.11080.371
Beryllium 24.89 68.9 75 125 20 S1.0 0 15.45 10.517.156
Cadmium 24.89 71.0 75 125 20 S1.0 0.3332 16.47 8.9418.015 Chromium 24.89 80.3 75 125 201.0 14.48 33.12 3.9834.460 Cobalt 24.89 80.7 75 125 201.0 7.113 26.19 3.7727.193
Copper 24.89 91.0 75 125 202.0 14.39 37.48 1.1437.051
Lead 24.89 85.2 75 125 201.0 5.497 22.92 15.326.712
Molybdenum 24.89 74.5 75 125 20 S1.0 0.9319 18.20 6.7619.476 Nickel 24.89 71.3 75 125 20 S1.0 14.08 30.66 3.7131.825 Selenium 24.89 61.0 75 125 20 S1.0 0 14.18 6.8015.180
Silver 24.89 68.7 75 125 20 S1.0 0 16.50 3.5317.095
Thallium 24.89 65.5 75 125 20 S2.0 0.4608 15.82 5.7616.757 Vanadium 24.89 109 75 125 201.0 29.18 53.20 5.7056.320
Zinc 24.89 75.5 75 125 201.0 45.30 60.84 5.2064.082
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 25 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 7471_S
Sample ID: MB-89235
Batch ID: 89235 TestNo: EPA 7471A Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156572
SeqNo: 4345092
MBLKSampType: TestCode: 7471_S
Mercury 0.10ND
Sample ID: LCS-89235
Batch ID: 89235 TestNo: EPA 7471A Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156572
SeqNo: 4345093
LCSSampType: TestCode: 7471_S
Mercury 0.4167 105 80 1200.10 00.439
Sample ID: N047043-002A-MS
Batch ID: 89235 TestNo: EPA 7471A Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156572
SeqNo: 4345098
MSSampType: TestCode: 7471_S
Mercury 0.4105 126 75 125 S0.099 00.516
Sample ID: N047043-002A-MSD
Batch ID: 89235 TestNo: EPA 7471A Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156572
SeqNo: 4345099
MSDSampType: TestCode: 7471_S
Mercury 0.4160 127 75 125 20 S0.10 0 0.5164 2.110.527
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 26 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8015GAS_5035C6C12
Sample ID: Q210910LCS
Batch ID: Q21VS115 TestNo: EPA 8015B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156603
SeqNo: 4347034
LCSSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 5.000 91.5 79 1341.0 04.574
Surr: Chlorobenzene - d5 100.0 89.3 54 16089.287
Sample ID: Q210910LCSD
Batch ID: Q21VS115 TestNo: EPA 8015B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS02
RunNo: 156603
SeqNo: 4347035
LCSDSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 5.000 107 79 134 201.0 0 4.574 15.35.333 Surr: Chlorobenzene - d5 100.0 92.2 54 160 092.184
Sample ID: Q210910MB
Batch ID: Q21VS115 TestNo: EPA 8015B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156603
SeqNo: 4347036
MBLKSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 1.0ND
Surr: Chlorobenzene - d5 100.0 95.5 54 16095.545
Sample ID: N047040-002BMS
Batch ID: Q21VS115 TestNo: EPA 8015B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156603
SeqNo: 4347044
MSSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 5.000 69.8 25 1661.0 2.4315.921
Surr: Chlorobenzene - d5 100.0 68.6 54 16068.567
Sample ID: N047040-002BMSD
Batch ID: Q21VS115 TestNo: EPA 8015B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156603
SeqNo: 4347045
MSDSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 5.000 75.8 25 166 201.0 2.431 5.921 4.936.220 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 27 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8015GAS_5035C6C12
Sample ID: N047040-002BMSD
Batch ID: Q21VS115 TestNo: EPA 8015B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156603
SeqNo: 4347045
MSDSampType: TestCode: 8015GAS_503
Surr: Chlorobenzene - d5 100.0 69.0 54 160 069.039
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 28 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210910-LCS
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156597
SeqNo: 4346450
LCSSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 100 76 1255.0 040.030
1,1,1-Trichloroethane 40.00 107 76 1245.0 042.740
1,1,2,2-Tetrachloroethane 40.00 90.3 71 1205.0 036.120
1,1,2-Trichloroethane 40.00 95.6 71 1205.0 038.230
1,1-Dichloroethane 40.00 97.7 74 1275.0 039.080
1,1-Dichloroethene 40.00 102 72 1235.0 040.920
1,1-Dichloropropene 40.00 112 80 1275.0 044.810
1,2,3-Trichlorobenzene 40.00 103 76 1235.0 041.220
1,2,3-Trichloropropane 40.00 99.7 69 1195.0 039.860
1,2,4-Trichlorobenzene 40.00 105 76 1225.0 041.980
1,2,4-Trimethylbenzene 40.00 100 80 1325.0 039.980
1,2-Dibromo-3-chloropropane 40.00 101 64 13010 040.450
1,2-Dibromoethane 40.00 99.6 73 1215.0 039.840
1,2-Dichlorobenzene 40.00 102 80 1205.0 040.980
1,2-Dichloroethane 40.00 96.5 76 1215.0 038.590
1,2-Dichloropropane 40.00 97.3 76 1205.0 038.920
1,3,5-Trimethylbenzene 40.00 99.3 80 1295.0 039.710
1,3-Dichlorobenzene 40.00 104 80 1205.0 041.710
1,3-Dichloropropane 40.00 97.8 76 1205.0 039.110
1,4-Dichlorobenzene 40.00 101 80 1205.0 040.320
2,2-Dichloropropane 40.00 106 68 1325.0 042.310
2-Butanone 400.0 106 34 14950 0423.320
2-Chlorotoluene 40.00 108 80 1225.0 043.240
4-Chlorotoluene 40.00 110 79 1245.0 043.850
4-Isopropyltoluene 40.00 99.1 80 1335.0 039.630
Benzene 40.00 104 80 1205.0 041.790
Bromobenzene 40.00 101 80 1205.0 040.330
Bromodichloromethane 40.00 96.4 76 1205.0 038.540
Bromoform 40.00 98.2 70 1315.0 039.260
Bromomethane 40.00 111 62 1445.0 044.530
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 29 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210910-LCS
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156597
SeqNo: 4346450
LCSSampType: TestCode: 8260SOIL503
Carbon tetrachloride 40.00 109 72 1365.0 043.600
Chlorobenzene 40.00 101 80 1205.0 040.510
Chloroethane 40.00 101 64 1555.0 040.540
Chloroform 40.00 97.8 76 1215.0 039.110
Chloromethane 40.00 94.7 56 1425.0 037.890
cis-1,2-Dichloroethene 40.00 103 76 1205.0 041.120
cis-1,3-Dichloropropene 40.00 100 73 1205.0 040.160
Di-isopropyl ether 40.00 98.0 68 1305.0 039.220
Dibromochloromethane 40.00 100 76 1235.0 040.040
Dibromomethane 40.00 93.0 77 1205.0 037.190
Dichlorodifluoromethane 40.00 93.4 51 1525.0 037.360
Ethyl Tert-butyl ether 40.00 117 72 1265.0 046.670
Ethylbenzene 40.00 109 80 1205.0 043.760
Freon-113 40.00 102 57 1365.0 040.610
Hexachlorobutadiene 40.00 102 77 1225.0 040.710
Isopropylbenzene 40.00 99.5 79 1285.0 039.790
m,p-Xylene 80.00 108 69 14110 086.720
Methylene chloride 40.00 92.0 70 1245.0 036.780
MTBE 40.00 101 69 1245.0 040.420
n-Butylbenzene 40.00 98.0 80 1315.0 039.190
n-Propylbenzene 40.00 106 80 1275.0 042.490
Naphthalene 40.00 85.4 65 1275.0 034.150
o-Xylene 40.00 104 77 1235.0 041.440
sec-Butylbenzene 40.00 98.8 80 1305.0 039.510
Styrene 40.00 99.6 80 1245.0 039.820
Tert-amyl methyl ether 40.00 116 71 1225.0 046.480
Tert-Butanol 200.0 92.4 44 14325 0184.700
tert-Butylbenzene 40.00 101 80 1255.0 040.320
Tetrachloroethene 40.00 109 80 1225.0 043.590
Toluene 40.00 108 80 1205.0 043.110
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 30 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210910-LCS
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156597
SeqNo: 4346450
LCSSampType: TestCode: 8260SOIL503
trans-1,2-Dichloroethene 40.00 101 71 1255.0 040.220
Trichloroethene 40.00 104 76 1215.0 041.470
Trichlorofluoromethane 40.00 99.4 66 1635.0 039.780
Vinyl chloride 40.00 99.4 65 1415.0 039.750
Surr: 1,2-Dichloroethane-d4 50.00 96.2 64 16548.120
Surr: 4-Bromofluorobenzene 50.00 100 69 12450.140
Surr: Dibromofluoromethane 50.00 97.0 72 14248.520
Surr: Toluene-d8 50.00 96.8 75 12448.400
Sample ID: N046979-001A-MS
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156597
SeqNo: 4346451
MSSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 92.6 62 1395.0 037.050
1,1,1-Trichloroethane 40.00 77.6 56 1545.0 031.050
1,1,2,2-Tetrachloroethane 40.00 99.2 42 1755.0 039.680
1,1,2-Trichloroethane 40.00 94.0 55 1665.0 037.600
1,1-Dichloroethane 40.00 76.4 46 1635.0 030.560
1,1-Dichloroethene 40.00 74.4 49 1575.0 029.780
1,1-Dichloropropene 40.00 89.0 59 1555.0 035.620
1,2,3-Trichlorobenzene 40.00 114 38 1545.0 045.550
1,2,3-Trichloropropane 40.00 105 49 1745.0 041.860
1,2,4-Trichlorobenzene 40.00 110 38 1465.0 044.160
1,2,4-Trimethylbenzene 40.00 90.4 41 1575.0 036.150
1,2-Dibromo-3-chloropropane 40.00 110 48 18510 043.990
1,2-Dibromoethane 40.00 102 54 1695.0 040.930
1,2-Dichlorobenzene 40.00 103 59 1365.0 041.070
1,2-Dichloroethane 40.00 94.5 54 1645.0 037.790
1,2-Dichloropropane 40.00 86.1 60 1425.0 034.450
1,3,5-Trimethylbenzene 40.00 86.4 44 1515.0 034.560
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 31 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N046979-001A-MS
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156597
SeqNo: 4346451
MSSampType: TestCode: 8260SOIL503
1,3-Dichlorobenzene 40.00 98.6 57 1335.0 039.420
1,3-Dichloropropane 40.00 102 63 1525.0 040.990
1,4-Dichlorobenzene 40.00 97.1 57 1335.0 038.840
2,2-Dichloropropane 40.00 75.5 50 1565.0 030.210
2-Butanone 400.0 106 37 19250 0425.500
2-Chlorotoluene 40.00 97.3 52 1405.0 038.900
4-Chlorotoluene 40.00 102 57 1355.0 040.710
4-Isopropyltoluene 40.00 84.3 46 1525.0 033.720
Benzene 40.00 88.0 59 1475.0 035.180
Bromobenzene 40.00 96.8 66 1315.0 038.710
Bromodichloromethane 40.00 88.8 54 1525.0 035.520
Bromoform 40.00 104 50 1765.0 041.800
Bromomethane 40.00 80.2 40 1785.0 032.070
Carbon tetrachloride 40.00 84.7 55 1595.0 033.890
Chlorobenzene 40.00 93.2 62 1375.0 037.260
Chloroethane 40.00 67.2 41 1735.0 026.890
Chloroform 40.00 79.4 50 1575.0 031.780
Chloromethane 40.00 71.8 41 1655.0 028.730
cis-1,2-Dichloroethene 40.00 83.4 48 1585.0 033.340
cis-1,3-Dichloropropene 40.00 94.7 59 1465.0 037.880
Di-isopropyl ether 40.00 85.8 44 1655.0 034.310
Dibromochloromethane 40.00 101 62 1515.0 040.590
Dibromomethane 40.00 93.3 52 1705.0 037.320
Dichlorodifluoromethane 40.00 66.6 36 1755.0 026.640
Ethyl Tert-butyl ether 40.00 102 52 1615.0 040.710
Ethylbenzene 40.00 94.4 55 1415.0 037.780
Freon-113 40.00 70.7 44 1615.0 028.270
Hexachlorobutadiene 40.00 93.0 34 1425.0 037.190
Isopropylbenzene 40.00 83.9 54 1435.0 033.560
m,p-Xylene 80.00 93.1 51 15010 074.470
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 32 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N046979-001A-MS
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156597
SeqNo: 4346451
MSSampType: TestCode: 8260SOIL503
Methylene chloride 40.00 78.9 49 1595.0 031.570
MTBE 40.00 92.1 43 1795.0 036.840
n-Butylbenzene 40.00 82.9 42 1525.0 033.170
n-Propylbenzene 40.00 90.4 54 1405.0 036.180
Naphthalene 40.00 99.8 37 1725.0 039.900
o-Xylene 40.00 92.9 49 1465.0 037.160
sec-Butylbenzene 40.00 83.9 51 1455.0 033.560
Styrene 40.00 91.6 57 1455.0 036.620
Tert-amyl methyl ether 40.00 112 58 1565.0 044.830
Tert-Butanol 200.0 96.0 40 18925 0191.910
tert-Butylbenzene 40.00 85.2 55 1405.0 034.090
Tetrachloroethene 40.00 88.6 59 1425.0 035.420
Toluene 40.00 90.0 54 1485.0 036.010
trans-1,2-Dichloroethene 40.00 78.2 46 1575.0 031.280
Trichloroethene 40.00 85.4 52 1615.0 034.170
Trichlorofluoromethane 40.00 72.0 43 1815.0 028.820
Vinyl chloride 40.00 71.0 52 1605.0 028.390
Surr: 1,2-Dichloroethane-d4 50.00 85.6 64 16542.810
Surr: 4-Bromofluorobenzene 50.00 101 69 12450.420
Surr: Dibromofluoromethane 50.00 87.0 72 14243.500
Surr: Toluene-d8 50.00 94.7 75 12447.340
Sample ID: N046979-001A-MSD
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156597
SeqNo: 4346452
MSDSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 92.3 62 139 205.0 0 37.05 0.35136.920 1,1,1-Trichloroethane 40.00 85.4 56 154 205.0 0 31.05 9.5734.170 1,1,2,2-Tetrachloroethane 40.00 100 42 175 205.0 0 39.68 1.2340.170 1,1,2-Trichloroethane 40.00 97.6 55 166 205.0 0 37.60 3.7639.040 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 33 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N046979-001A-MSD
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156597
SeqNo: 4346452
MSDSampType: TestCode: 8260SOIL503
1,1-Dichloroethane 40.00 84.2 46 163 205.0 0 30.56 9.6533.660 1,1-Dichloroethene 40.00 82.5 49 157 205.0 0 29.78 10.333.010 1,1-Dichloropropene 40.00 91.6 59 155 205.0 0 35.62 2.7736.620 1,2,3-Trichlorobenzene 40.00 108 38 154 205.0 0 45.55 5.0443.310 1,2,3-Trichloropropane 40.00 105 49 174 205.0 0 41.86 0.023941.870 1,2,4-Trichlorobenzene 40.00 102 38 146 205.0 0 44.16 7.8940.810 1,2,4-Trimethylbenzene 40.00 89.0 41 157 205.0 0 36.15 1.5335.600 1,2-Dibromo-3-chloropropane 40.00 116 48 185 2010 0 43.99 5.5946.520 1,2-Dibromoethane 40.00 107 54 169 205.0 0 40.93 4.4942.810 1,2-Dichlorobenzene 40.00 100 59 136 205.0 0 41.07 2.1940.180 1,2-Dichloroethane 40.00 93.6 54 164 205.0 0 37.79 0.93037.440 1,2-Dichloropropane 40.00 89.9 60 142 205.0 0 34.45 4.2935.960 1,3,5-Trimethylbenzene 40.00 87.4 44 151 205.0 0 34.56 1.0934.940 1,3-Dichlorobenzene 40.00 98.7 57 133 205.0 0 39.42 0.12739.470 1,3-Dichloropropane 40.00 98.8 63 152 205.0 0 40.99 3.6839.510 1,4-Dichlorobenzene 40.00 95.9 57 133 205.0 0 38.84 1.3038.340 2,2-Dichloropropane 40.00 85.3 50 156 205.0 0 30.21 12.234.130 2-Butanone 400.0 117 37 192 2050 0 425.5 9.51467.970
2-Chlorotoluene 40.00 97.0 52 140 205.0 0 38.90 0.28338.790 4-Chlorotoluene 40.00 102 57 135 205.0 0 40.71 0.12340.760 4-Isopropyltoluene 40.00 84.1 46 152 205.0 0 33.72 0.23833.640 Benzene 40.00 90.9 59 147 205.0 0 35.18 3.3036.360
Bromobenzene 40.00 99.7 66 131 205.0 0 38.71 3.0039.890 Bromodichloromethane 40.00 91.0 54 152 205.0 0 35.52 2.4236.390 Bromoform 40.00 103 50 176 205.0 0 41.80 1.2541.280
Bromomethane 40.00 97.1 40 178 205.0 0 32.07 19.138.840 Carbon tetrachloride 40.00 89.9 55 159 205.0 0 33.89 5.9535.970 Chlorobenzene 40.00 92.6 62 137 205.0 0 37.26 0.61937.030 Chloroethane 40.00 80.4 41 173 205.0 0 26.89 17.932.180 Chloroform 40.00 87.5 50 157 205.0 0 31.78 9.6735.010
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 34 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N046979-001A-MSD
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156597
SeqNo: 4346452
MSDSampType: TestCode: 8260SOIL503
Chloromethane 40.00 83.4 41 165 205.0 0 28.73 14.933.370 cis-1,2-Dichloroethene 40.00 91.4 48 158 205.0 0 33.34 9.2436.570 cis-1,3-Dichloropropene 40.00 95.8 59 146 205.0 0 37.88 1.1838.330 Di-isopropyl ether 40.00 93.3 44 165 205.0 0 34.31 8.4337.330 Dibromochloromethane 40.00 100 62 151 205.0 0 40.59 1.0440.170 Dibromomethane 40.00 96.9 52 170 205.0 0 37.32 3.7338.740 Dichlorodifluoromethane 40.00 74.0 36 175 205.0 0 26.64 10.629.610 Ethyl Tert-butyl ether 40.00 113 52 161 205.0 0 40.71 10.345.130 Ethylbenzene 40.00 94.0 55 141 205.0 0 37.78 0.50437.590 Freon-113 40.00 80.6 44 161 205.0 0 28.27 13.132.220
Hexachlorobutadiene 40.00 87.1 34 142 205.0 0 37.19 6.5034.850 Isopropylbenzene 40.00 84.9 54 143 205.0 0 33.56 1.1833.960 m,p-Xylene 80.00 92.5 51 150 2010 0 74.47 0.67473.970
Methylene chloride 40.00 85.4 49 159 205.0 0 31.57 7.8834.160 MTBE 40.00 103 43 179 205.0 0 36.84 11.541.330
n-Butylbenzene 40.00 82.8 42 152 205.0 0 33.17 0.21133.100 n-Propylbenzene 40.00 90.7 54 140 205.0 0 36.18 0.24836.270 Naphthalene 40.00 95.8 37 172 205.0 0 39.90 4.0738.310
o-Xylene 40.00 92.4 49 146 205.0 0 37.16 0.54036.960
sec-Butylbenzene 40.00 83.9 51 145 205.0 0 33.56 0.059633.540 Styrene 40.00 89.8 57 145 205.0 0 36.62 1.9335.920
Tert-amyl methyl ether 40.00 118 58 156 205.0 0 44.83 5.1547.200 Tert-Butanol 200.0 104 40 189 2025 0 191.9 7.78207.440
tert-Butylbenzene 40.00 85.9 55 140 205.0 0 34.09 0.73134.340 Tetrachloroethene 40.00 88.4 59 142 205.0 0 35.42 0.14135.370 Toluene 40.00 93.2 54 148 205.0 0 36.01 3.4937.290
trans-1,2-Dichloroethene 40.00 83.8 46 157 205.0 0 31.28 6.9433.530 Trichloroethene 40.00 88.2 52 161 205.0 0 34.17 3.2535.300 Trichlorofluoromethane 40.00 77.9 43 181 205.0 0 28.82 7.7731.150 Vinyl chloride 40.00 78.6 52 160 205.0 0 28.39 10.131.420 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 35 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N046979-001A-MSD
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156597
SeqNo: 4346452
MSDSampType: TestCode: 8260SOIL503
Surr: 1,2-Dichloroethane-d4 50.00 97.1 64 165 048.530
Surr: 4-Bromofluorobenzene 50.00 101 69 124 050.280
Surr: Dibromofluoromethane 50.00 94.3 72 142 047.170
Surr: Toluene-d8 50.00 95.9 75 124 047.970
Sample ID: R210910-MB2
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156597
SeqNo: 4346454
MBLKSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 5.0ND
1,1,1-Trichloroethane 5.0ND
1,1,2,2-Tetrachloroethane 5.0ND
1,1,2-Trichloroethane 5.0ND
1,1-Dichloroethane 5.0ND
1,1-Dichloroethene 5.0ND
1,1-Dichloropropene 5.0ND
1,2,3-Trichlorobenzene 5.0ND
1,2,3-Trichloropropane 5.0ND
1,2,4-Trichlorobenzene 5.0ND
1,2,4-Trimethylbenzene 5.0ND
1,2-Dibromo-3-chloropropane 10ND
1,2-Dibromoethane 5.0ND
1,2-Dichlorobenzene 5.0ND
1,2-Dichloroethane 5.0ND
1,2-Dichloropropane 5.0ND
1,3,5-Trimethylbenzene 5.0ND
1,3-Dichlorobenzene 5.0ND
1,3-Dichloropropane 5.0ND
1,4-Dichlorobenzene 5.0ND
2,2-Dichloropropane 5.0ND
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 36 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210910-MB2
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156597
SeqNo: 4346454
MBLKSampType: TestCode: 8260SOIL503
2-Butanone 50ND
2-Chlorotoluene 5.0ND
4-Chlorotoluene 5.0ND
4-Isopropyltoluene 5.0ND
Benzene 5.0ND
Bromobenzene 5.0ND
Bromodichloromethane 5.0ND
Bromoform 5.0ND
Bromomethane 5.0ND
Carbon tetrachloride 5.0ND
Chlorobenzene 5.0ND
Chloroethane 5.0ND
Chloroform 5.0ND
Chloromethane 5.0ND
cis-1,2-Dichloroethene 5.0ND
cis-1,3-Dichloropropene 5.0ND
Di-isopropyl ether 5.0ND
Dibromochloromethane 5.0ND
Dibromomethane 5.0ND
Dichlorodifluoromethane 5.0ND
Ethyl Tert-butyl ether 5.0ND
Ethylbenzene 5.0ND
Freon-113 5.0ND
Hexachlorobutadiene 5.0ND
Isopropylbenzene 5.0ND
m,p-Xylene 10ND
Methylene chloride 5.0ND
MTBE 5.0ND
n-Butylbenzene 5.0ND
n-Propylbenzene 5.0ND
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 37 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210910-MB2
Batch ID: R21VS050 TestNo: EPA 8260B Analysis Date: 9/10/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156597
SeqNo: 4346454
MBLKSampType: TestCode: 8260SOIL503
Naphthalene 5.0ND
o-Xylene 5.0ND
sec-Butylbenzene 5.0ND
Styrene 5.0ND
Tert-amyl methyl ether 5.0ND
Tert-Butanol 25ND
tert-Butylbenzene 5.0ND
Tetrachloroethene 5.0ND
Toluene 5.0ND
trans-1,2-Dichloroethene 5.0ND
Trichloroethene 5.0ND
Trichlorofluoromethane 5.0ND
Vinyl chloride 5.0ND
Surr: 1,2-Dichloroethane-d4 50.00 108 64 16554.090
Surr: 4-Bromofluorobenzene 50.00 89.3 69 12444.650
Surr: Dibromofluoromethane 50.00 108 72 14253.770
Surr: Toluene-d8 50.00 95.4 75 12447.690
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 38 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-LCS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156639
SeqNo: 4350427
LCSSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 111 76 1255.0 044.280
1,1,1-Trichloroethane 40.00 112 76 1245.0 044.780
1,1,2,2-Tetrachloroethane 40.00 95.5 71 1205.0 038.200
1,1,2-Trichloroethane 40.00 101 71 1205.0 040.520
1,1-Dichloroethane 40.00 100 74 1275.0 040.000
1,1-Dichloroethene 40.00 109 72 1235.0 043.760
1,1-Dichloropropene 40.00 120 80 1275.0 048.100
1,2,3-Trichlorobenzene 40.00 110 76 1235.0 043.980
1,2,3-Trichloropropane 40.00 107 69 1195.0 042.720
1,2,4-Trichlorobenzene 40.00 107 76 1225.0 042.930
1,2,4-Trimethylbenzene 40.00 108 80 1325.0 043.340
1,2-Dibromo-3-chloropropane 40.00 104 64 13010 041.750
1,2-Dibromoethane 40.00 108 73 1215.0 043.210
1,2-Dichlorobenzene 40.00 110 80 1205.0 043.990
1,2-Dichloroethane 40.00 106 76 1215.0 042.330
1,2-Dichloropropane 40.00 102 76 1205.0 040.930
1,3,5-Trimethylbenzene 40.00 108 80 1295.0 043.320
1,3-Dichlorobenzene 40.00 114 80 1205.0 045.510
1,3-Dichloropropane 40.00 103 76 1205.0 041.350
1,4-Dichlorobenzene 40.00 110 80 1205.0 043.810
2,2-Dichloropropane 40.00 110 68 1325.0 044.070
2-Butanone 400.0 103 34 14950 0411.860
2-Chlorotoluene 40.00 117 80 1225.0 046.700
4-Chlorotoluene 40.00 118 79 1245.0 047.190
4-Isopropyltoluene 40.00 106 80 1335.0 042.590
Benzene 40.00 112 80 1205.0 044.980
Bromobenzene 40.00 107 80 1205.0 042.930
Bromodichloromethane 40.00 106 76 1205.0 042.600
Bromoform 40.00 112 70 1315.0 044.910
Bromomethane 40.00 119 62 1445.0 047.780
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 39 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-LCS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156639
SeqNo: 4350427
LCSSampType: TestCode: 8260SOIL503
Carbon tetrachloride 40.00 124 72 1365.0 049.670
Chlorobenzene 40.00 112 80 1205.0 044.780
Chloroethane 40.00 106 64 1555.0 042.500
Chloroform 40.00 103 76 1215.0 041.090
Chloromethane 40.00 94.2 56 1425.0 037.690
cis-1,2-Dichloroethene 40.00 104 76 1205.0 041.510
cis-1,3-Dichloropropene 40.00 104 73 1205.0 041.580
Di-isopropyl ether 40.00 93.9 68 1305.0 037.570
Dibromochloromethane 40.00 108 76 1235.0 043.100
Dibromomethane 40.00 101 77 1205.0 040.490
Dichlorodifluoromethane 40.00 98.6 51 1525.0 039.460
Ethyl Tert-butyl ether 40.00 115 72 1265.0 046.050
Ethylbenzene 40.00 119 80 1205.0 047.490
Freon-113 40.00 111 57 1365.0 044.590
Hexachlorobutadiene 40.00 112 77 1225.0 044.900
Isopropylbenzene 40.00 105 79 1285.0 041.870
m,p-Xylene 80.00 118 69 14110 094.400
Methylene chloride 40.00 96.1 70 1245.0 038.440
MTBE 40.00 97.8 69 1245.0 039.120
n-Butylbenzene 40.00 105 80 1315.0 042.120
n-Propylbenzene 40.00 113 80 1275.0 045.250
Naphthalene 40.00 88.2 65 1275.0 035.270
o-Xylene 40.00 110 77 1235.0 044.140
sec-Butylbenzene 40.00 106 80 1305.0 042.580
Styrene 40.00 106 80 1245.0 042.490
Tert-amyl methyl ether 40.00 118 71 1225.0 047.340
Tert-Butanol 200.0 94.2 44 14325 0188.320
tert-Butylbenzene 40.00 106 80 1255.0 042.420
Tetrachloroethene 40.00 119 80 1225.0 047.740
Toluene 40.00 115 80 1205.0 046.120
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 40 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-LCS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156639
SeqNo: 4350427
LCSSampType: TestCode: 8260SOIL503
trans-1,2-Dichloroethene 40.00 102 71 1255.0 040.780
Trichloroethene 40.00 113 76 1215.0 045.290
Trichlorofluoromethane 40.00 109 66 1635.0 043.710
Vinyl chloride 40.00 103 65 1415.0 041.230
Surr: 1,2-Dichloroethane-d4 50.00 93.3 64 16546.670
Surr: 4-Bromofluorobenzene 50.00 98.4 69 12449.200
Surr: Dibromofluoromethane 50.00 94.3 72 14247.150
Surr: Toluene-d8 50.00 95.5 75 12447.740
Sample ID: N047080-001A-MS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350428
MSSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 94.8 62 1395.0 037.930
1,1,1-Trichloroethane 40.00 86.0 56 1545.0 034.380
1,1,2,2-Tetrachloroethane 40.00 95.3 42 1755.0 038.120
1,1,2-Trichloroethane 40.00 98.5 55 1665.0 039.400
1,1-Dichloroethane 40.00 82.1 46 1635.0 032.830
1,1-Dichloroethene 40.00 81.8 49 1575.0 032.730
1,1-Dichloropropene 40.00 91.8 59 1555.0 036.700
1,2,3-Trichlorobenzene 40.00 114 38 1545.0 045.750
1,2,3-Trichloropropane 40.00 103 49 1745.0 041.290
1,2,4-Trichlorobenzene 40.00 109 38 1465.0 043.540
1,2,4-Trimethylbenzene 40.00 87.7 41 1575.0 035.090
1,2-Dibromo-3-chloropropane 40.00 111 48 18510 044.560
1,2-Dibromoethane 40.00 108 54 1695.0 043.070
1,2-Dichlorobenzene 40.00 101 59 1365.0 040.210
1,2-Dichloroethane 40.00 99.7 54 1645.0 039.860
1,2-Dichloropropane 40.00 89.5 60 1425.0 035.810
1,3,5-Trimethylbenzene 40.00 84.3 44 1515.0 033.710
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 41 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350428
MSSampType: TestCode: 8260SOIL503
1,3-Dichlorobenzene 40.00 98.4 57 1335.0 039.340
1,3-Dichloropropane 40.00 103 63 1525.0 041.000
1,4-Dichlorobenzene 40.00 95.0 57 1335.0 037.990
2,2-Dichloropropane 40.00 82.5 50 1565.0 033.000
2-Butanone 400.0 114 37 19250 0454.580
2-Chlorotoluene 40.00 94.6 52 1405.0 037.860
4-Chlorotoluene 40.00 98.5 57 1355.0 039.400
4-Isopropyltoluene 40.00 81.1 46 1525.0 032.450
Benzene 40.00 90.3 59 1475.0 036.130
Bromobenzene 40.00 98.8 66 1315.0 039.530
Bromodichloromethane 40.00 93.8 54 1525.0 037.540
Bromoform 40.00 108 50 1765.0 043.360
Bromomethane 40.00 89.5 40 1785.0 035.790
Carbon tetrachloride 40.00 88.6 55 1595.0 035.450
Chlorobenzene 40.00 93.5 62 1375.0 037.390
Chloroethane 40.00 79.6 41 1735.0 031.820
Chloroform 40.00 86.8 50 1575.0 034.720
Chloromethane 40.00 73.3 41 1655.0 029.310
cis-1,2-Dichloroethene 40.00 90.4 48 1585.0 036.140
cis-1,3-Dichloropropene 40.00 94.7 59 1465.0 037.890
Di-isopropyl ether 40.00 87.4 44 1655.0 034.970
Dibromochloromethane 40.00 101 62 1515.0 040.310
Dibromomethane 40.00 98.4 52 1705.0 039.360
Dichlorodifluoromethane 40.00 66.1 36 1755.0 026.420
Ethyl Tert-butyl ether 40.00 106 52 1615.0 042.480
Ethylbenzene 40.00 93.9 55 1415.0 037.550
Freon-113 40.00 79.7 44 1615.0 031.880
Hexachlorobutadiene 40.00 93.4 34 1425.0 037.350
Isopropylbenzene 40.00 81.1 54 1435.0 032.440
m,p-Xylene 80.00 93.3 51 15010 074.660
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 42 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350428
MSSampType: TestCode: 8260SOIL503
Methylene chloride 40.00 84.8 49 1595.0 033.940
MTBE 40.00 97.7 43 1795.0 039.090
n-Butylbenzene 40.00 80.1 42 1525.0 032.020
n-Propylbenzene 40.00 87.7 54 1405.0 035.080
Naphthalene 40.00 101 37 1725.0 040.400
o-Xylene 40.00 91.0 49 1465.0 036.390
sec-Butylbenzene 40.00 80.7 51 1455.0 032.280
Styrene 40.00 90.7 57 1455.0 036.260
Tert-amyl methyl ether 40.00 109 58 1565.0 043.670
Tert-Butanol 200.0 101 40 18925 0201.220
tert-Butylbenzene 40.00 81.7 55 1405.0 032.690
Tetrachloroethene 40.00 92.7 59 1425.0 037.080
Toluene 40.00 92.1 54 1485.0 036.850
trans-1,2-Dichloroethene 40.00 83.4 46 1575.0 033.360
Trichloroethene 40.00 90.7 52 1615.0 036.290
Trichlorofluoromethane 40.00 79.0 43 1815.0 031.610
Vinyl chloride 40.00 73.6 52 1605.0 029.460
Surr: 1,2-Dichloroethane-d4 50.00 96.5 64 16548.240
Surr: 4-Bromofluorobenzene 50.00 99.8 69 12449.910
Surr: Dibromofluoromethane 50.00 98.8 72 14249.390
Surr: Toluene-d8 50.00 95.5 75 12447.740
Sample ID: N047080-001A-MSD
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350429
MSDSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 94.6 62 139 205.0 0 37.93 0.18537.860 1,1,1-Trichloroethane 40.00 81.7 56 154 205.0 0 34.38 5.0732.680 1,1,2,2-Tetrachloroethane 40.00 90.5 42 175 205.0 0 38.12 5.1436.210 1,1,2-Trichloroethane 40.00 104 55 166 205.0 0 39.40 5.3641.570 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 43 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MSD
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350429
MSDSampType: TestCode: 8260SOIL503
1,1-Dichloroethane 40.00 83.0 46 163 205.0 0 32.83 1.1233.200 1,1-Dichloroethene 40.00 81.6 49 157 205.0 0 32.73 0.27532.640 1,1-Dichloropropene 40.00 89.0 59 155 205.0 0 36.70 3.0135.610 1,2,3-Trichlorobenzene 40.00 107 38 154 205.0 0 45.75 6.4142.910 1,2,3-Trichloropropane 40.00 101 49 174 205.0 0 41.29 1.9340.500 1,2,4-Trichlorobenzene 40.00 103 38 146 205.0 0 43.54 5.4741.220 1,2,4-Trimethylbenzene 40.00 83.1 41 157 205.0 0 35.09 5.3833.250 1,2-Dibromo-3-chloropropane 40.00 109 48 185 2010 0 44.56 2.2943.550 1,2-Dibromoethane 40.00 110 54 169 205.0 0 43.07 1.8943.890 1,2-Dichlorobenzene 40.00 98.2 59 136 205.0 0 40.21 2.2939.300 1,2-Dichloroethane 40.00 102 54 164 205.0 0 39.86 2.7240.960 1,2-Dichloropropane 40.00 93.1 60 142 205.0 0 35.81 3.8937.230 1,3,5-Trimethylbenzene 40.00 79.4 44 151 205.0 0 33.71 6.0231.740 1,3-Dichlorobenzene 40.00 94.6 57 133 205.0 0 39.34 3.9437.820 1,3-Dichloropropane 40.00 99.4 63 152 205.0 0 41.00 3.1039.750 1,4-Dichlorobenzene 40.00 92.5 57 133 205.0 0 37.99 2.6736.990 2,2-Dichloropropane 40.00 81.2 50 156 205.0 0 33.00 1.5332.500 2-Butanone 400.0 122 37 192 2050 0 454.6 7.41489.570
2-Chlorotoluene 40.00 90.0 52 140 205.0 0 37.86 5.0436.000 4-Chlorotoluene 40.00 95.1 57 135 205.0 0 39.40 3.5138.040 4-Isopropyltoluene 40.00 74.5 46 152 205.0 0 32.45 8.5129.800 Benzene 40.00 91.2 59 147 205.0 0 36.13 0.90936.460
Bromobenzene 40.00 95.9 66 131 205.0 0 39.53 3.0638.340 Bromodichloromethane 40.00 96.0 54 152 205.0 0 37.54 2.2938.410 Bromoform 40.00 110 50 176 205.0 0 43.36 1.2443.900
Bromomethane 40.00 96.5 40 178 205.0 0 35.79 7.5338.590 Carbon tetrachloride 40.00 86.4 55 159 205.0 0 35.45 2.5134.570 Chlorobenzene 40.00 91.4 62 137 205.0 0 37.39 2.2436.560 Chloroethane 40.00 74.9 41 173 205.0 0 31.82 6.0229.960 Chloroform 40.00 89.8 50 157 205.0 0 34.72 3.3735.910
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 44 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MSD
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350429
MSDSampType: TestCode: 8260SOIL503
Chloromethane 40.00 73.2 41 165 205.0 0 29.31 0.068329.290 cis-1,2-Dichloroethene 40.00 92.2 48 158 205.0 0 36.14 1.9736.860 cis-1,3-Dichloropropene 40.00 100 59 146 205.0 0 37.89 5.4240.000 Di-isopropyl ether 40.00 92.0 44 165 205.0 0 34.97 5.1036.800 Dibromochloromethane 40.00 100 62 151 205.0 0 40.31 0.64740.050 Dibromomethane 40.00 102 52 170 205.0 0 39.36 3.8140.890 Dichlorodifluoromethane 40.00 63.6 36 175 205.0 0 26.42 3.8625.420 Ethyl Tert-butyl ether 40.00 114 52 161 205.0 0 42.48 6.7345.440 Ethylbenzene 40.00 88.4 55 141 205.0 0 37.55 6.0135.360 Freon-113 40.00 77.0 44 161 205.0 0 31.88 3.4830.790
Hexachlorobutadiene 40.00 84.5 34 142 205.0 0 37.35 10.033.790 Isopropylbenzene 40.00 74.5 54 143 205.0 0 32.44 8.5229.790 m,p-Xylene 80.00 88.4 51 150 2010 0 74.66 5.4570.700
Methylene chloride 40.00 89.1 49 159 205.0 0 33.94 4.8935.640 MTBE 40.00 106 43 179 205.0 0 39.09 7.7542.240
n-Butylbenzene 40.00 72.2 42 152 205.0 0 32.02 10.328.870 n-Propylbenzene 40.00 80.9 54 140 205.0 0 35.08 8.1332.340 Naphthalene 40.00 96.2 37 172 205.0 0 40.40 4.9238.460
o-Xylene 40.00 87.1 49 146 205.0 0 36.39 4.3834.830
sec-Butylbenzene 40.00 73.7 51 145 205.0 0 32.28 9.0729.480 Styrene 40.00 88.8 57 145 205.0 0 36.26 2.0635.520
Tert-amyl methyl ether 40.00 119 58 156 205.0 0 43.67 8.9947.780 Tert-Butanol 200.0 108 40 189 2025 0 201.2 7.41216.710
tert-Butylbenzene 40.00 76.0 55 140 205.0 0 32.69 7.2930.390 Tetrachloroethene 40.00 84.6 59 142 205.0 0 37.08 9.1733.830 Toluene 40.00 93.1 54 148 205.0 0 36.85 1.0337.230
trans-1,2-Dichloroethene 40.00 81.8 46 157 205.0 0 33.36 1.9132.730 Trichloroethene 40.00 94.3 52 161 205.0 0 36.29 3.8937.730 Trichlorofluoromethane 40.00 73.8 43 181 205.0 0 31.61 6.8029.530 Vinyl chloride 40.00 71.0 52 160 205.0 0 29.46 3.6328.410 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 45 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MSD
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350429
MSDSampType: TestCode: 8260SOIL503
Surr: 1,2-Dichloroethane-d4 50.00 102 64 165 051.170
Surr: 4-Bromofluorobenzene 50.00 99.3 69 124 049.640
Surr: Dibromofluoromethane 50.00 99.3 72 142 049.640
Surr: Toluene-d8 50.00 94.0 75 124 047.020
Sample ID: R210914-MB2
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156639
SeqNo: 4350430
MBLKSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 5.0ND
1,1,1-Trichloroethane 5.0ND
1,1,2,2-Tetrachloroethane 5.0ND
1,1,2-Trichloroethane 5.0ND
1,1-Dichloroethane 5.0ND
1,1-Dichloroethene 5.0ND
1,1-Dichloropropene 5.0ND
1,2,3-Trichlorobenzene 5.0ND
1,2,3-Trichloropropane 5.0ND
1,2,4-Trichlorobenzene 5.0ND
1,2,4-Trimethylbenzene 5.0ND
1,2-Dibromo-3-chloropropane 10ND
1,2-Dibromoethane 5.0ND
1,2-Dichlorobenzene 5.0ND
1,2-Dichloroethane 5.0ND
1,2-Dichloropropane 5.0ND
1,3,5-Trimethylbenzene 5.0ND
1,3-Dichlorobenzene 5.0ND
1,3-Dichloropropane 5.0ND
1,4-Dichlorobenzene 5.0ND
2,2-Dichloropropane 5.0ND
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 46 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-MB2
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156639
SeqNo: 4350430
MBLKSampType: TestCode: 8260SOIL503
2-Butanone 50ND
2-Chlorotoluene 5.0ND
4-Chlorotoluene 5.0ND
4-Isopropyltoluene 5.0ND
Benzene 5.0ND
Bromobenzene 5.0ND
Bromodichloromethane 5.0ND
Bromoform 5.0ND
Bromomethane 5.0ND
Carbon tetrachloride 5.0ND
Chlorobenzene 5.0ND
Chloroethane 5.0ND
Chloroform 5.0ND
Chloromethane 5.0ND
cis-1,2-Dichloroethene 5.0ND
cis-1,3-Dichloropropene 5.0ND
Di-isopropyl ether 5.0ND
Dibromochloromethane 5.0ND
Dibromomethane 5.0ND
Dichlorodifluoromethane 5.0ND
Ethyl Tert-butyl ether 5.0ND
Ethylbenzene 5.0ND
Freon-113 5.0ND
Hexachlorobutadiene 5.0ND
Isopropylbenzene 5.0ND
m,p-Xylene 10ND
Methylene chloride 5.0ND
MTBE 5.0ND
n-Butylbenzene 5.0ND
n-Propylbenzene 5.0ND
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 47 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-MB2
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156639
SeqNo: 4350430
MBLKSampType: TestCode: 8260SOIL503
Naphthalene 5.0ND
o-Xylene 5.0ND
sec-Butylbenzene 5.0ND
Styrene 5.0ND
Tert-amyl methyl ether 5.0ND
Tert-Butanol 25ND
tert-Butylbenzene 5.0ND
Tetrachloroethene 5.0ND
Toluene 5.0ND
trans-1,2-Dichloroethene 5.0ND
Trichloroethene 5.0ND
Trichlorofluoromethane 5.0ND
Vinyl chloride 5.0ND
Surr: 1,2-Dichloroethane-d4 50.00 103 64 16551.660
Surr: 4-Bromofluorobenzene 50.00 91.4 69 12445.680
Surr: Dibromofluoromethane 50.00 105 72 14252.310
Surr: Toluene-d8 50.00 96.5 75 12448.270
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 48 of 50

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“Serving Clients with Passion and Professionalism”
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ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: HC_S_SEMI
Sample ID: MB-89240
Batch ID: 89240 TestNo: EPA 8015B(M Analysis Date: 9/10/2021 Prep Date: 9/10/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156582
SeqNo: 4346349
MBLKSampType: TestCode: HC_S_SEMI
EPA 3550B
T/R Hydrocarbons: C13-C22 10ND
T/R Hydrocarbons: C23-C40 10ND
Surr: p-Terphenyl 80.00 128 56 133102.771
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 49 of 50

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047044 ANALYTICAL QC SUMMARY REPORT
TestCode: HC_S_SEMI
Sample ID: MB-89280
Batch ID: 89280 TestNo: EPA 8015B(M Analysis Date: 9/14/2021 Prep Date: 9/14/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156652
SeqNo: 4350861
MBLKSampType: TestCode: HC_S_SEMI
EPA 3550B
T/R Hydrocarbons: C13-C22 10ND
T/R Hydrocarbons: C23-C40 10ND
Surr: p-Terphenyl 80.00 114 56 13390.927
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 50 of 50
N047044-01
-02
-03
-04
-05
-06
-07
-08
-09
-10
N047044-11
-12
ASSET Laboratories
Please review the checklist below. Any NO signifies non-compliance. Any non-compliance will be noted and must be understood as having an impact on the quality of the data. All tests will be performed as requested regardless of any compliance issues.

If you have any questions or further instruction, please contact our Project Coordinator at (702) 307-2659.

Carrier name: ASSET
Cooler Received/Opened On: 9/9/2021
Rep sample Temp (Deg C): 2.4 IR Gun ID: 1
Temp Blank: Yes No
Last 4 digits of Tracking No.: NA
Cooling process: Ice Ice Pack Dry Ice Other None
Packing Material Used: None
Workorder: N047044
Sample Receipt Checklist

4. Chain of custody present? Yes No

6. Chain of custody signed when relinquished and received? Yes No

7. Chain of custody agrees with sample labels? Yes No

8. Samples in proper container/bottle? Yes No

9. Sample containers intact? Yes No

10. Sufficient sample volume for indicated test? Yes No

11. All samples received within holding time? Yes No
Yes No NA13. Water - VOA vials have zero headspace?

14. Water - pH acceptable upon receipt? Yes No NA
Example: pH > 12 for (CN,S); pH<2 for Metals

1. Shipping container/cooler in good condition? Yes No Not Present

2. Custody seals intact, signed, dated on shippping container/cooler? Yes No Not Present

3. Custody seals intact on sample bottles? Yes No Not Present

5. Sampler's name present in COC? Yes No

12. Temperature of rep sample or Temp Blank within acceptable limit? Yes No NA Yes No NA15. Did the bottle labels indicate correct preservatives used?

16. Were there Non-Conformance issues at login?
Yes No NA
Was Client notified? Yes No NA
Comments: .Received at Las Vegas Lab on 09/10/21 at 4.9°C, IR#1, GSO # 0581.

Checklist Completed By: TM Reviewed By:
9/13/2021
Subject: RE: Costco Culver City, 20201678.001A (ASSET Labs No. N047044)From: <[email protected]>Date: 9/13/2021, 11:21 AMTo: "'Lindsey Dandridge-Perry'" <[email protected]>CC: "'Ashley Marie DaSilva'" <[email protected]>, "'Yoandra Rodriguez'"<[email protected]>, "'Giselle G'" <[email protected]>,<rusƟ[email protected]>, "'Mary Ann'"<[email protected]>Hi LindseyThank you for confirming via text message. We will analyze samples on the aƩached COC using EPA 8015 and not EPA8260.RegardsThadFrom: [email protected] <[email protected]>Sent: Monday, September 13, 2021 10:53 AMTo: 'Lindsey Dandridge-Perry' <LDandridge@kleinfelder .com>Cc: 'Ashley Marie DaSilva' <[email protected]>; 'Yoandra Rodriguez' <[email protected]>;'Giselle G' <[email protected]>; 'rusƟ[email protected]'<rusƟ[email protected]>; 'Mary Ann' <[email protected]>Subject: Costco Culver City, 20201678.001A (ASSET Labs No. N047044)Hi LindseyHope this email finds you well!Please confirm that you want TPH GRO analyzed by EPA 8015. AƩached is the COC for your reference.RegardsThad RE: Costco Culver City, 20201678.001A (ASSET Labs No. N047044) 1 of 19/13/2021, 11:49 AM
1 Mary Ann Balilu ([email protected]) From: Lindsey Dandridge-Perry <[email protected]> Sent: Tuesday, September 14, 2021 10:42 AM
To: Yoandra Rodriguez
Cc: [email protected]; [email protected] Subject: RE: Costco Culver City, 20201678.001A (ASSET Labs No. N047044) Attachments: RE: N047044 COC and Work Order Summary for Sample Received 9/9/2021 (196 KB) Correct, please see attached the correction email from Saturday. All the 9/8/21 dates should be 9/9/21.

Thanks,
Lindsey

From: Yoandra Rodriguez <[email protected]> Sent: Tuesday, September 14, 2021 9:20 AM
To: Lindsey Dandridge-Perry <[email protected]> Cc: [email protected]; [email protected] Subject: Costco Culver City, 20201678.001A (ASSET Labs No. N047044)

External Email
Hi Lindsey,

For the above project, please note the relinquished date should be 9/9/21 instead of 9/8/21.

Attached is the COC for reference.

--
Thanks,

Yoandra Rodriguez
Nevada: 3151 W. Post Road, Las Vegas, NV 89118 | P: 702.307.2659 | F: 702.307.2691 California: 11110 Artesia Blvd., Ste. B, Cerritos, CA 90703 | P: 562.219.7435 | F: 562.219.7436

ASSET LABORATORIES - Serving Clients with Passion and Professionalism

This message is intended for the use of the individual or entity to which it is addressed. This may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or a gent responsible for deli vering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by telephone and delete the original message. T hank you. 1 AssetLabs Sample Control
From: Lindsey Dandridge-Perry <[email protected]> Sent: Saturday, September 11, 2021 10:36 AM
To: AssetLabs Sample Control
Subject: RE: N047044 COC and Work Order Summary for Sample Received 9/9/2021 Attachments: N047044.pdf
Morning,

The sample collection date for KB-1 and KB-2 was actually 9/9/21.

Thank you!
Lindsey

From: AssetLabs Sample Control <[email protected]> Sent: Friday, September 10, 2021 4:09 PM
To: Lindsey Dandridge-Perry <[email protected]> Subject: N047044 COC and Work Order Summary for Sample Received 9/9/2021

External Email
Hi Lindsey Dandridge-Perry:

Enclosed are COC and WO Summary for samples received 9/9/2021. If you have any questions, please contact your Project Manager listed below.

Thad Malit
General Manager
11110 Artesia Blvd. Suite B
Cerritos, CA 90703

Tel. No.: (562) 219-7435
Fax No.: (562) 219-7436
Cell No.: (310) 503-2359
Email: [email protected]/[email protected]

Thank you for using ASSET Laboratories.

Sincerely,
Mary Ann Balilu
Sample Control Officer

Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 14-Sep-21
WorkOrder: N047044
Comments: TPM- carbon Chain full scan for selected samples.

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/9/2021
Test Name
ASSET Laboratories
Storage
N047044-001A KB-1-2.5 9/9/2021 8:30:00 AM Soil WS
N047044-002A KB-1-5 9/9/2021 8:55:00 AM 9/16/2021 EPA 3050B SOPREP TOTAL METALS WS 9/16/2021 EPA 6010B TOTAL METALS BY ICP WS
9/16/2021 MERCURY PREP WS
9/16/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/16/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/16/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
N047044-002B 9/16/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/16/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047044-002C 9/16/2021 EPA 5035 Closed System Purge and Trap VS 9/16/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047044-002D VS-CA
N047044-002E VS
N047044-002F VS-CA
N047044-003A KB-1-10 9/9/2021 9:08:00 AM WS
N047044-004A KB-1-15 9/9/2021 9:30:00 AM 9/16/2021 EPA 3050B SOPREP TOTAL METALS WS 9/16/2021 EPA 6010B TOTAL METALS BY ICP WS
9/16/2021 MERCURY PREP WS
9/16/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/16/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
1 of 5Page
Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 14-Sep-21
WorkOrder: N047044
Comments: TPM- carbon Chain full scan for selected samples.

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/9/2021
Test Name
ASSET Laboratories
Storage
N047044-004A KB-1-15 9/9/2021 9:30:00 AM 9/16/2021 Soil EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE FUELS
WS
N047044-004B 9/16/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/16/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047044-004C 9/16/2021 EPA 5035 Closed System Purge and Trap VS 9/16/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047044-004D VS-CA
N047044-004E VS
N047044-004F VS-CA
N047044-005A KB-1-20 9/9/2021 9:36:00 AM 9/16/2021 EPA 3050B SOPREP TOTAL METALS WS 9/16/2021 EPA 6010B TOTAL METALS BY ICP WS
9/16/2021 MERCURY PREP WS
9/16/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/16/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/16/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
N047044-005B 9/16/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/16/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047044-005C 9/16/2021 EPA 5035 Closed System Purge and Trap VS 9/16/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047044-005D VS-CA
N047044-005E VS
2 of 5Page
Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 14-Sep-21
WorkOrder: N047044
Comments: TPM- carbon Chain full scan for selected samples.

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/9/2021
Test Name
ASSET Laboratories
Storage
N047044-005F KB-1-20 9/9/2021 9:36:00 AM Soil VS-CA
N047044-006A KB-1-25 9/9/2021 9:41:00 AM WS
N047044-007A KB-2-2.5 9/9/2021 10:27:00 AM 9/16/2021 EPA 3050B SOPREP TOTAL METALS WS 9/16/2021 EPA 6010B TOTAL METALS BY ICP WS
9/16/2021 MERCURY PREP WS
9/16/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/16/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/16/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
N047044-007B 9/16/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/16/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047044-007C 9/16/2021 EPA 5035 Closed System Purge and Trap VS 9/16/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047044-007D VS-CA
N047044-007E VS
N047044-007F VS-CA
N047044-008A KB-2-5 9/9/2021 10:43:00 AM 9/16/2021 EPA 3050B SOPREP TOTAL METALS WS 9/16/2021 EPA 6010B TOTAL METALS BY ICP WS
9/16/2021 MERCURY PREP WS
9/16/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/16/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
3 of 5Page
Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 14-Sep-21
WorkOrder: N047044
Comments: TPM- carbon Chain full scan for selected samples.

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/9/2021
Test Name
ASSET Laboratories
Storage
N047044-008A KB-2-5 9/9/2021 10:43:00 AM 9/16/2021 Soil EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE FUELS
WS
N047044-008B 9/16/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/16/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047044-008C 9/16/2021 EPA 5035 Closed System Purge and Trap VS 9/16/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047044-008D VS-CA
N047044-008E VS
N047044-008F VS-CA
N047044-009A KB-2-10 9/9/2021 11:18:00 AM WS
N047044-010A KB-2-15 9/9/2021 11:24:00 AM WS
N047044-011A KB-2-20 9/9/2021 11:35:00 AM WS
N047044-012A KB-2-25 9/9/2021 11:45:00 AM 9/16/2021 EPA 3050B SOPREP TOTAL METALS WS 9/16/2021 EPA 6010B TOTAL METALS BY ICP WS
9/16/2021 MERCURY PREP WS
9/16/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/16/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/16/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
N047044-012B 9/16/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/16/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047044-012C 9/16/2021 EPA 5035 Closed System Purge and Trap VS 4 of 5Page
Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 14-Sep-21
WorkOrder: N047044
Comments: TPM- carbon Chain full scan for selected samples.

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/9/2021
Test Name
ASSET Laboratories
Storage
N047044-012C KB-2-25 9/9/2021 11:45:00 AM 9/16/2021 Soil EPA 8015B GASOLINE RANGE ORGANICS BY GC/FID
VS
N047044-012D VS-CA
N047044-012E VS
N047044-012F VS-CA
N047044-013A FOLDER 9/16/2021 9/16/2021 Folder Folder LAB 9/16/2021 Folder Folder LAB
5 of 5Page

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

September 17, 2021
Kleinfelder
Lindsey Dandridge-Perry
Attention: Lindsey Dandridge-Perry
RE: Costco Culver City, 20201678.001A
Workorder No.:N047070FAX:

TEL: (949) 585-3133
24411 Ridge Route Dr. #225
Laguna Hills, CA 92653
Thank you for the opportunity to service the needs of your company.

Please feel free to call me at (562) 219-7435 if I can be of further assistance to your company.

Sincerely,
Andrew Garaniel
Laboratory Director
Enclosed are the results for sample(s) received on September 10, 2021 by ASSET Laboratories.

The sample(s) are tested for the parameters as indicated in the enclosed chain of custody in accordance with the applicable laboratory certifications.

The cover letter is an integral part of this analytical report. This Laboratory Report cannot be reproduced in part or in its entirety without written permission from the client and ASSET Laboratories - California. 1 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
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ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

17-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Lab Order: N047070

CASE NARRATIVE
SAMPLE RECEIVING/GENERAL COMMENTS:

All sample containers were received intact with proper chain of custody documentation.

Information on sample receipt conditions including discrepancies can be found in attached Sample Receipt Checklist Form.

Cooler temperature and sample preservation were verified upon receipt of samples if applicable.

Samples were analyzed within method holding time.

Results were J-Flag. "J" is used to flag those results that are between the PQL (Practical Quantitation Limit) and the calculated MDL (Method Detection Limit). Results that are "J" Flagged are estimated values since it becomes difficult to accurately quantitate the analyte near the MDL.

Analytical Comments for EPA 8015B:

RPD for Matrix Spike (MS)/Matrix Spike Duplicate (MSD) is outside criteria for GRO in QC samples N047112-005A-MS/MSD possibly due to non-homogeneity of sample; however, the analytical batch was validated by the Laboratory Control Sample (LCS).
2 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

17-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Lab Order: N047070
Work Order Sample Summary
Lab Sample ID Client Sample ID Collection DateMatrix Date Received Contract No:

Date Reported
N047070-001AKB-3-2.5 9/9/2021 8:04:00 AM 9/10/2021 9/17/2021Soil N047070-002AKB-3-5 9/9/2021 8:18:00 AM 9/10/2021 9/17/2021Soil N047070-002BKB-3-5 9/9/2021 8:18:00 AM 9/10/2021 9/17/2021Soil N047070-002CKB-3-5 9/9/2021 8:18:00 AM 9/10/2021 9/17/2021Soil N047070-002DKB-3-5 9/9/2021 8:18:00 AM 9/10/2021 9/17/2021Soil N047070-002EKB-3-5 9/9/2021 8:18:00 AM 9/10/2021 9/17/2021Soil N047070-002FKB-3-5 9/9/2021 8:18:00 AM 9/10/2021 9/17/2021Soil N047070-003AKB-3-10 9/9/2021 8:55:00 AM 9/10/2021 9/17/2021Soil N047070-003BKB-3-10 9/9/2021 8:55:00 AM 9/10/2021 9/17/2021Soil N047070-003CKB-3-10 9/9/2021 8:55:00 AM 9/10/2021 9/17/2021Soil N047070-003DKB-3-10 9/9/2021 8:55:00 AM 9/10/2021 9/17/2021Soil N047070-003EKB-3-10 9/9/2021 8:55:00 AM 9/10/2021 9/17/2021Soil N047070-003FKB-3-10 9/9/2021 8:55:00 AM 9/10/2021 9/17/2021Soil N047070-004AKB-3-15 9/9/2021 9:01:00 AM 9/10/2021 9/17/2021Soil N047070-005AKB-3-20 9/9/2021 9:20:00 AM 9/10/2021 9/17/2021Soil N047070-005BKB-3-20 9/9/2021 9:20:00 AM 9/10/2021 9/17/2021Soil N047070-005CKB-3-20 9/9/2021 9:20:00 AM 9/10/2021 9/17/2021Soil N047070-005DKB-3-20 9/9/2021 9:20:00 AM 9/10/2021 9/17/2021Soil N047070-005EKB-3-20 9/9/2021 9:20:00 AM 9/10/2021 9/17/2021Soil N047070-005FKB-3-20 9/9/2021 9:20:00 AM 9/10/2021 9/17/2021Soil N047070-006AKB-3-25 9/9/2021 9:33:00 AM 9/10/2021 9/17/2021Soil N047070-007AKB-4-2.5 9/9/2021 12:57:00 PM 9/10/2021 9/17/2021Soil N047070-007BKB-4-2.5 9/9/2021 12:57:00 PM 9/10/2021 9/17/2021Soil N047070-007CKB-4-2.5 9/9/2021 12:57:00 PM 9/10/2021 9/17/2021Soil N047070-007DKB-4-2.5 9/9/2021 12:57:00 PM 9/10/2021 9/17/2021Soil N047070-007EKB-4-2.5 9/9/2021 12:57:00 PM 9/10/2021 9/17/2021Soil N047070-007FKB-4-2.5 9/9/2021 12:57:00 PM 9/10/2021 9/17/2021Soil N047070-008AKB-4-5 9/9/2021 1:03:00 PM 9/10/2021 9/17/2021Soil N047070-008BKB-4-5 9/9/2021 1:03:00 PM 9/10/2021 9/17/2021Soil 3 of 41

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3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
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“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Lab Order: N047070
Work Order Sample Summary
Lab Sample ID Client Sample ID Collection DateMatrix Date Received Contract No:

Date Reported
N047070-008CKB-4-5 9/9/2021 1:03:00 PM 9/10/2021 9/17/2021Soil N047070-008DKB-4-5 9/9/2021 1:03:00 PM 9/10/2021 9/17/2021Soil N047070-008EKB-4-5 9/9/2021 1:03:00 PM 9/10/2021 9/17/2021Soil N047070-008FKB-4-5 9/9/2021 1:03:00 PM 9/10/2021 9/17/2021Soil N047070-009AKB-4-10 9/9/2021 1:29:00 PM 9/10/2021 9/17/2021Soil N047070-009BKB-4-10 9/9/2021 1:29:00 PM 9/10/2021 9/17/2021Soil N047070-009CKB-4-10 9/9/2021 1:29:00 PM 9/10/2021 9/17/2021Soil N047070-009DKB-4-10 9/9/2021 1:29:00 PM 9/10/2021 9/17/2021Soil N047070-009EKB-4-10 9/9/2021 1:29:00 PM 9/10/2021 9/17/2021Soil N047070-009FKB-4-10 9/9/2021 1:29:00 PM 9/10/2021 9/17/2021Soil N047070-010AKB-4-15 9/9/2021 1:55:00 PM 9/10/2021 9/17/2021Soil N047070-011AKB-4-20 9/9/2021 1:38:00 PM 9/10/2021 9/17/2021Soil N047070-012AKB-4-25 9/9/2021 1:44:00 PM 9/10/2021 9/17/2021Soil 4 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-5
Collection Date: 9/9/2021 8:18:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-002
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 4.0 µg/Kg 1ND 0.41 9/14/2021 02:15 PM 1,1,1-Trichloroethane 4.0 µg/Kg 1ND 0.32 9/14/2021 02:15 PM 1,1,2,2-Tetrachloroethane 4.0 µg/Kg 1ND 0.18 9/14/2021 02:15 PM 1,1,2-Trichloroethane 4.0 µg/Kg 1ND 0.37 9/14/2021 02:15 PM 1,1-Dichloroethane 4.0 µg/Kg 1ND 0.35 9/14/2021 02:15 PM 1,1-Dichloroethene 4.0 µg/Kg 1ND 0.26 9/14/2021 02:15 PM 1,1-Dichloropropene 4.0 µg/Kg 1ND 0.26 9/14/2021 02:15 PM 1,2,3-Trichlorobenzene 4.0 µg/Kg 1ND 0.16 9/14/2021 02:15 PM 1,2,3-Trichloropropane 4.0 µg/Kg 1ND 0.37 9/14/2021 02:15 PM 1,2,4-Trichlorobenzene 4.0 µg/Kg 1ND 0.15 9/14/2021 02:15 PM 1,2,4-Trimethylbenzene 4.0 µg/Kg 1ND 0.096 9/14/2021 02:15 PM 1,2-Dibromo-3-chloropropane 8.0 µg/Kg 1ND 0.54 9/14/2021 02:15 PM 1,2-Dibromoethane 4.0 µg/Kg 1ND 0.29 9/14/2021 02:15 PM 1,2-Dichlorobenzene 4.0 µg/Kg 1ND 0.13 9/14/2021 02:15 PM 1,2-Dichloroethane 4.0 µg/Kg 1ND 0.26 9/14/2021 02:15 PM 1,2-Dichloropropane 4.0 µg/Kg 1ND 0.24 9/14/2021 02:15 PM 1,3,5-Trimethylbenzene 4.0 µg/Kg 1ND 0.44 9/14/2021 02:15 PM 1,3-Dichlorobenzene 4.0 µg/Kg 1ND 0.14 9/14/2021 02:15 PM 1,3-Dichloropropane 4.0 µg/Kg 1ND 0.21 9/14/2021 02:15 PM 1,4-Dichlorobenzene 4.0 µg/Kg 1ND 0.13 9/14/2021 02:15 PM 2,2-Dichloropropane 4.0 µg/Kg 1ND 0.31 9/14/2021 02:15 PM 2-Butanone 40 µg/Kg 1ND 7.5 9/14/2021 02:15 PM
2-Chlorotoluene 4.0 µg/Kg 1ND 0.14 9/14/2021 02:15 PM
4-Chlorotoluene 4.0 µg/Kg 1ND 0.11 9/14/2021 02:15 PM
4-Isopropyltoluene 4.0 µg/Kg 1ND 0.12 9/14/2021 02:15 PM Benzene 4.0 µg/Kg 1ND 0.17 9/14/2021 02:15 PM
Bromobenzene 4.0 µg/Kg 1ND 0.16 9/14/2021 02:15 PM
Bromodichloromethane 4.0 µg/Kg 1ND 0.33 9/14/2021 02:15 PM Bromoform 4.0 µg/Kg 1ND 0.37 9/14/2021 02:15 PM
Bromomethane 4.0 µg/Kg 1ND 0.72 9/14/2021 02:15 PM
Carbon tetrachloride 4.0 µg/Kg 1ND 0.52 9/14/2021 02:15 PM Chlorobenzene 4.0 µg/Kg 1ND 0.17 9/14/2021 02:15 PM
Chloroethane 4.0 µg/Kg 1ND 1.3 9/14/2021 02:15 PM
Chloroform 4.0 µg/Kg 1ND 0.63 9/14/2021 02:15 PM
Chloromethane 4.0 µg/Kg 1ND 0.37 9/14/2021 02:15 PM
cis-1,2-Dichloroethene 4.0 µg/Kg 1ND 0.17 9/14/2021 02:15 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 5 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-5
Collection Date: 9/9/2021 8:18:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-002
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 4.0 µg/Kg 1ND 0.25 9/14/2021 02:15 PM Di-isopropyl ether 4.0 µg/Kg 1ND 0.22 9/14/2021 02:15 PM Dibromochloromethane 4.0 µg/Kg 1ND 0.36 9/14/2021 02:15 PM Dibromomethane 4.0 µg/Kg 1ND 0.21 9/14/2021 02:15 PM
Dichlorodifluoromethane 4.0 µg/Kg 1ND 0.62 9/14/2021 02:15 PM Ethyl Tert-butyl ether 4.0 µg/Kg 1ND 0.18 9/14/2021 02:15 PM Ethylbenzene 4.0 µg/Kg 1ND 0.18 9/14/2021 02:15 PM
Freon-113 4.0 µg/Kg 1ND 0.44 9/14/2021 02:15 PM
Hexachlorobutadiene 4.0 µg/Kg 1ND 0.47 9/14/2021 02:15 PM Isopropylbenzene 4.0 µg/Kg 1ND 0.15 9/14/2021 02:15 PM
m,p-Xylene 8.0 µg/Kg 1ND 0.36 9/14/2021 02:15 PM
Methylene chloride 4.0 µg/Kg 1ND 2.9 9/14/2021 02:15 PM MTBE 4.0 µg/Kg 1ND 0.69 9/14/2021 02:15 PM
n-Butylbenzene 4.0 µg/Kg 1ND 0.15 9/14/2021 02:15 PM
n-Propylbenzene 4.0 µg/Kg 1ND 0.16 9/14/2021 02:15 PM
Naphthalene 4.0 µg/Kg 1ND 0.30 9/14/2021 02:15 PM
o-Xylene 4.0 µg/Kg 1ND 0.14 9/14/2021 02:15 PM
sec-Butylbenzene 4.0 µg/Kg 1ND 0.14 9/14/2021 02:15 PM
Styrene 4.0 µg/Kg 1ND 0.95 9/14/2021 02:15 PM
Tert-amyl methyl ether 4.0 µg/Kg 1ND 0.21 9/14/2021 02:15 PM Tert-Butanol 20 µg/Kg 1ND 5.2 9/14/2021 02:15 PM
tert-Butylbenzene 4.0 µg/Kg 1ND 0.16 9/14/2021 02:15 PM Tetrachloroethene 4.0 µg/Kg 1ND 0.40 9/14/2021 02:15 PM Toluene 4.0 µg/Kg 1ND 0.23 9/14/2021 02:15 PM
trans-1,2-Dichloroethene 4.0 µg/Kg 1ND 0.43 9/14/2021 02:15 PM Trichloroethene 4.0 µg/Kg 1ND 0.41 9/14/2021 02:15 PM
Trichlorofluoromethane 4.0 µg/Kg 1ND 0.46 9/14/2021 02:15 PM Vinyl chloride 4.0 µg/Kg 1ND 0.30 9/14/2021 02:15 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1137 0 9/14/2021 02:15 PM Surr: 4-Bromofluorobenzene 69-124 %REC 192.4 0 9/14/2021 02:15 PM Surr: Dibromofluoromethane 72-142 %REC 1122 0 9/14/2021 02:15 PM Surr: Toluene-d8 75-124 %REC 194.3 0 9/14/2021 02:15 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 6 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-5
Collection Date: 9/9/2021 8:18:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-002
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/13/2021 06:38 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 125 10 9/13/2021 06:38 PM Surr: p-Terphenyl 56-133 %REC 1126 0 9/13/2021 06:38 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210915B Q21VS118QC Batch: PrepDate: 9/15/2021 GRO (C6 - C12) J0.78 mg/Kg 10.20 0.19 9/16/2021 10:02 AM Surr: Chlorobenzene - d5 54-160 %REC 190.3 0 9/16/2021 10:02 AM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210913A 89255QC Batch: PrepDate: 9/11/2021 Mercury J0.10 mg/Kg 10.017 0.010 9/13/2021 09:51 AM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210911D 89254QC Batch: PrepDate: 9/11/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 08:22 PM
Arsenic 1.0 mg/Kg 1ND 0.54 9/16/2021 09:59 PM
Barium 1.0 mg/Kg 1110 0.31 9/11/2021 08:22 PM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 08:22 PM
Cadmium J1.0 mg/Kg 10.61 0.27 9/11/2021 08:22 PM
Chromium 1.0 mg/Kg 1160 0.32 9/16/2021 09:59 PM
Cobalt 1.0 mg/Kg 16.7 0.29 9/11/2021 08:22 PM
Copper 2.0 mg/Kg 113 0.89 9/11/2021 08:22 PM
Lead 1.0 mg/Kg 13.2 0.30 9/11/2021 08:22 PM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/11/2021 08:22 PM
Nickel 1.0 mg/Kg 115 0.34 9/11/2021 08:22 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 08:22 PM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 08:22 PM
Thallium 2.0 mg/Kg 1ND 0.35 9/11/2021 08:22 PM
Vanadium 1.0 mg/Kg 136 0.22 9/11/2021 08:22 PM
Zinc 1.0 mg/Kg 134 0.30 9/11/2021 08:22 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 7 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-10
Collection Date: 9/9/2021 8:55:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-003
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 4.6 µg/Kg 1ND 0.47 9/14/2021 02:39 PM 1,1,1-Trichloroethane 4.6 µg/Kg 1ND 0.37 9/14/2021 02:39 PM 1,1,2,2-Tetrachloroethane 4.6 µg/Kg 1ND 0.21 9/14/2021 02:39 PM 1,1,2-Trichloroethane 4.6 µg/Kg 1ND 0.42 9/14/2021 02:39 PM 1,1-Dichloroethane 4.6 µg/Kg 1ND 0.40 9/14/2021 02:39 PM 1,1-Dichloroethene 4.6 µg/Kg 1ND 0.29 9/14/2021 02:39 PM 1,1-Dichloropropene 4.6 µg/Kg 1ND 0.29 9/14/2021 02:39 PM 1,2,3-Trichlorobenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 02:39 PM 1,2,3-Trichloropropane 4.6 µg/Kg 1ND 0.43 9/14/2021 02:39 PM 1,2,4-Trichlorobenzene 4.6 µg/Kg 1ND 0.17 9/14/2021 02:39 PM 1,2,4-Trimethylbenzene 4.6 µg/Kg 1ND 0.11 9/14/2021 02:39 PM 1,2-Dibromo-3-chloropropane 9.1 µg/Kg 1ND 0.62 9/14/2021 02:39 PM 1,2-Dibromoethane 4.6 µg/Kg 1ND 0.34 9/14/2021 02:39 PM 1,2-Dichlorobenzene 4.6 µg/Kg 1ND 0.15 9/14/2021 02:39 PM 1,2-Dichloroethane 4.6 µg/Kg 1ND 0.30 9/14/2021 02:39 PM 1,2-Dichloropropane 4.6 µg/Kg 1ND 0.28 9/14/2021 02:39 PM 1,3,5-Trimethylbenzene 4.6 µg/Kg 1ND 0.50 9/14/2021 02:39 PM 1,3-Dichlorobenzene 4.6 µg/Kg 1ND 0.15 9/14/2021 02:39 PM 1,3-Dichloropropane 4.6 µg/Kg 1ND 0.24 9/14/2021 02:39 PM 1,4-Dichlorobenzene 4.6 µg/Kg 1ND 0.15 9/14/2021 02:39 PM 2,2-Dichloropropane 4.6 µg/Kg 1ND 0.35 9/14/2021 02:39 PM 2-Butanone 46 µg/Kg 1ND 8.5 9/14/2021 02:39 PM
2-Chlorotoluene 4.6 µg/Kg 1ND 0.16 9/14/2021 02:39 PM
4-Chlorotoluene 4.6 µg/Kg 1ND 0.13 9/14/2021 02:39 PM
4-Isopropyltoluene 4.6 µg/Kg 1ND 0.14 9/14/2021 02:39 PM Benzene 4.6 µg/Kg 1ND 0.19 9/14/2021 02:39 PM
Bromobenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 02:39 PM
Bromodichloromethane 4.6 µg/Kg 1ND 0.37 9/14/2021 02:39 PM Bromoform 4.6 µg/Kg 1ND 0.42 9/14/2021 02:39 PM
Bromomethane 4.6 µg/Kg 1ND 0.82 9/14/2021 02:39 PM
Carbon tetrachloride 4.6 µg/Kg 1ND 0.59 9/14/2021 02:39 PM Chlorobenzene 4.6 µg/Kg 1ND 0.20 9/14/2021 02:39 PM
Chloroethane 4.6 µg/Kg 1ND 1.5 9/14/2021 02:39 PM
Chloroform 4.6 µg/Kg 1ND 0.72 9/14/2021 02:39 PM
Chloromethane 4.6 µg/Kg 1ND 0.42 9/14/2021 02:39 PM
cis-1,2-Dichloroethene 4.6 µg/Kg 1ND 0.19 9/14/2021 02:39 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 8 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-10
Collection Date: 9/9/2021 8:55:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-003
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 4.6 µg/Kg 1ND 0.29 9/14/2021 02:39 PM Di-isopropyl ether 4.6 µg/Kg 1ND 0.25 9/14/2021 02:39 PM Dibromochloromethane 4.6 µg/Kg 1ND 0.41 9/14/2021 02:39 PM Dibromomethane 4.6 µg/Kg 1ND 0.24 9/14/2021 02:39 PM
Dichlorodifluoromethane 4.6 µg/Kg 1ND 0.70 9/14/2021 02:39 PM Ethyl Tert-butyl ether 4.6 µg/Kg 1ND 0.20 9/14/2021 02:39 PM Ethylbenzene 4.6 µg/Kg 1ND 0.20 9/14/2021 02:39 PM
Freon-113 4.6 µg/Kg 1ND 0.50 9/14/2021 02:39 PM
Hexachlorobutadiene 4.6 µg/Kg 1ND 0.54 9/14/2021 02:39 PM Isopropylbenzene 4.6 µg/Kg 1ND 0.17 9/14/2021 02:39 PM
m,p-Xylene 9.1 µg/Kg 1ND 0.41 9/14/2021 02:39 PM
Methylene chloride 4.6 µg/Kg 1ND 3.3 9/14/2021 02:39 PM MTBE 4.6 µg/Kg 1ND 0.79 9/14/2021 02:39 PM
n-Butylbenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 02:39 PM
n-Propylbenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 02:39 PM
Naphthalene 4.6 µg/Kg 1ND 0.35 9/14/2021 02:39 PM
o-Xylene 4.6 µg/Kg 1ND 0.16 9/14/2021 02:39 PM
sec-Butylbenzene 4.6 µg/Kg 1ND 0.15 9/14/2021 02:39 PM
Styrene 4.6 µg/Kg 1ND 1.1 9/14/2021 02:39 PM
Tert-amyl methyl ether 4.6 µg/Kg 1ND 0.23 9/14/2021 02:39 PM Tert-Butanol 23 µg/Kg 1ND 5.9 9/14/2021 02:39 PM
tert-Butylbenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 02:39 PM Tetrachloroethene 4.6 µg/Kg 1ND 0.45 9/14/2021 02:39 PM Toluene 4.6 µg/Kg 1ND 0.26 9/14/2021 02:39 PM
trans-1,2-Dichloroethene 4.6 µg/Kg 1ND 0.49 9/14/2021 02:39 PM Trichloroethene 4.6 µg/Kg 1ND 0.46 9/14/2021 02:39 PM
Trichlorofluoromethane 4.6 µg/Kg 1ND 0.52 9/14/2021 02:39 PM Vinyl chloride 4.6 µg/Kg 1ND 0.35 9/14/2021 02:39 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1130 0 9/14/2021 02:39 PM Surr: 4-Bromofluorobenzene 69-124 %REC 195.3 0 9/14/2021 02:39 PM Surr: Dibromofluoromethane 72-142 %REC 1120 0 9/14/2021 02:39 PM Surr: Toluene-d8 75-124 %REC 199.3 0 9/14/2021 02:39 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 9 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-10
Collection Date: 9/9/2021 8:55:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-003
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/13/2021 07:08 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 1ND 10 9/13/2021 07:08 PM Surr: p-Terphenyl 56-133 %REC 1124 0 9/13/2021 07:08 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210915B Q21VS118QC Batch: PrepDate: 9/15/2021 GRO (C6 - C12) J0.78 mg/Kg 10.20 0.19 9/16/2021 10:35 AM Surr: Chlorobenzene - d5 54-160 %REC 185.7 0 9/16/2021 10:35 AM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210913A 89255QC Batch: PrepDate: 9/11/2021 Mercury 0.10 mg/Kg 10.11 0.010 9/13/2021 09:55 AM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210911D 89254QC Batch: PrepDate: 9/11/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 08:28 PM
Arsenic 1.0 mg/Kg 1ND 0.54 9/13/2021 11:23 AM
Barium 1.0 mg/Kg 147 0.31 9/11/2021 08:28 PM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 08:28 PM
Cadmium J1.0 mg/Kg 10.52 0.27 9/11/2021 08:28 PM
Chromium 1.0 mg/Kg 119 0.32 9/13/2021 11:23 AM
Cobalt 1.0 mg/Kg 15.0 0.29 9/11/2021 08:28 PM
Copper 2.0 mg/Kg 113 0.89 9/11/2021 08:28 PM
Lead 1.0 mg/Kg 12.4 0.30 9/11/2021 08:28 PM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/11/2021 08:28 PM
Nickel 1.0 mg/Kg 111 0.34 9/11/2021 08:28 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 08:28 PM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 08:28 PM
Thallium J2.0 mg/Kg 10.55 0.35 9/11/2021 08:28 PM
Vanadium 1.0 mg/Kg 130 0.22 9/11/2021 08:28 PM
Zinc 1.0 mg/Kg 128 0.30 9/11/2021 08:28 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 10 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-20
Collection Date: 9/9/2021 9:20:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-005
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 4.6 µg/Kg 1ND 0.48 9/14/2021 03:03 PM 1,1,1-Trichloroethane 4.6 µg/Kg 1ND 0.37 9/14/2021 03:03 PM 1,1,2,2-Tetrachloroethane 4.6 µg/Kg 1ND 0.21 9/14/2021 03:03 PM 1,1,2-Trichloroethane 4.6 µg/Kg 1ND 0.43 9/14/2021 03:03 PM 1,1-Dichloroethane 4.6 µg/Kg 1ND 0.41 9/14/2021 03:03 PM 1,1-Dichloroethene 4.6 µg/Kg 1ND 0.30 9/14/2021 03:03 PM 1,1-Dichloropropene 4.6 µg/Kg 1ND 0.30 9/14/2021 03:03 PM 1,2,3-Trichlorobenzene 4.6 µg/Kg 1ND 0.19 9/14/2021 03:03 PM 1,2,3-Trichloropropane 4.6 µg/Kg 1ND 0.43 9/14/2021 03:03 PM 1,2,4-Trichlorobenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 03:03 PM 1,2,4-Trimethylbenzene 4.6 µg/Kg 1ND 0.11 9/14/2021 03:03 PM 1,2-Dibromo-3-chloropropane 9.3 µg/Kg 1ND 0.63 9/14/2021 03:03 PM 1,2-Dibromoethane 4.6 µg/Kg 1ND 0.34 9/14/2021 03:03 PM 1,2-Dichlorobenzene 4.6 µg/Kg 1ND 0.15 9/14/2021 03:03 PM 1,2-Dichloroethane 4.6 µg/Kg 1ND 0.30 9/14/2021 03:03 PM 1,2-Dichloropropane 4.6 µg/Kg 1ND 0.28 9/14/2021 03:03 PM 1,3,5-Trimethylbenzene 4.6 µg/Kg 1ND 0.51 9/14/2021 03:03 PM 1,3-Dichlorobenzene 4.6 µg/Kg 1ND 0.16 9/14/2021 03:03 PM 1,3-Dichloropropane 4.6 µg/Kg 1ND 0.24 9/14/2021 03:03 PM 1,4-Dichlorobenzene 4.6 µg/Kg 1ND 0.15 9/14/2021 03:03 PM 2,2-Dichloropropane 4.6 µg/Kg 1ND 0.36 9/14/2021 03:03 PM 2-Butanone 46 µg/Kg 1ND 8.6 9/14/2021 03:03 PM
2-Chlorotoluene 4.6 µg/Kg 1ND 0.16 9/14/2021 03:03 PM
4-Chlorotoluene 4.6 µg/Kg 1ND 0.13 9/14/2021 03:03 PM
4-Isopropyltoluene 4.6 µg/Kg 1ND 0.14 9/14/2021 03:03 PM Benzene 4.6 µg/Kg 1ND 0.20 9/14/2021 03:03 PM
Bromobenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 03:03 PM
Bromodichloromethane 4.6 µg/Kg 1ND 0.38 9/14/2021 03:03 PM Bromoform 4.6 µg/Kg 1ND 0.43 9/14/2021 03:03 PM
Bromomethane 4.6 µg/Kg 1ND 0.83 9/14/2021 03:03 PM
Carbon tetrachloride 4.6 µg/Kg 1ND 0.60 9/14/2021 03:03 PM Chlorobenzene 4.6 µg/Kg 1ND 0.20 9/14/2021 03:03 PM
Chloroethane 4.6 µg/Kg 1ND 1.5 9/14/2021 03:03 PM
Chloroform 4.6 µg/Kg 1ND 0.73 9/14/2021 03:03 PM
Chloromethane J4.6 µg/Kg 10.81 0.43 9/14/2021 03:03 PM
cis-1,2-Dichloroethene 4.6 µg/Kg 1ND 0.19 9/14/2021 03:03 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 11 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-20
Collection Date: 9/9/2021 9:20:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-005
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 4.6 µg/Kg 1ND 0.29 9/14/2021 03:03 PM Di-isopropyl ether 4.6 µg/Kg 1ND 0.26 9/14/2021 03:03 PM Dibromochloromethane 4.6 µg/Kg 1ND 0.41 9/14/2021 03:03 PM Dibromomethane 4.6 µg/Kg 1ND 0.25 9/14/2021 03:03 PM
Dichlorodifluoromethane 4.6 µg/Kg 1ND 0.71 9/14/2021 03:03 PM Ethyl Tert-butyl ether 4.6 µg/Kg 1ND 0.21 9/14/2021 03:03 PM Ethylbenzene 4.6 µg/Kg 1ND 0.21 9/14/2021 03:03 PM
Freon-113 4.6 µg/Kg 1ND 0.51 9/14/2021 03:03 PM
Hexachlorobutadiene 4.6 µg/Kg 1ND 0.55 9/14/2021 03:03 PM Isopropylbenzene 4.6 µg/Kg 1ND 0.17 9/14/2021 03:03 PM
m,p-Xylene 9.3 µg/Kg 1ND 0.42 9/14/2021 03:03 PM
Methylene chloride 4.6 µg/Kg 1ND 3.3 9/14/2021 03:03 PM MTBE 4.6 µg/Kg 1ND 0.80 9/14/2021 03:03 PM
n-Butylbenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 03:03 PM
n-Propylbenzene 4.6 µg/Kg 1ND 0.18 9/14/2021 03:03 PM
Naphthalene 4.6 µg/Kg 1ND 0.35 9/14/2021 03:03 PM
o-Xylene 4.6 µg/Kg 1ND 0.16 9/14/2021 03:03 PM
sec-Butylbenzene 4.6 µg/Kg 1ND 0.16 9/14/2021 03:03 PM
Styrene 4.6 µg/Kg 1ND 1.1 9/14/2021 03:03 PM
Tert-amyl methyl ether 4.6 µg/Kg 1ND 0.24 9/14/2021 03:03 PM Tert-Butanol 23 µg/Kg 1ND 6.0 9/14/2021 03:03 PM
tert-Butylbenzene 4.6 µg/Kg 1ND 0.19 9/14/2021 03:03 PM Tetrachloroethene 4.6 µg/Kg 1ND 0.46 9/14/2021 03:03 PM Toluene 4.6 µg/Kg 1ND 0.27 9/14/2021 03:03 PM
trans-1,2-Dichloroethene 4.6 µg/Kg 1ND 0.50 9/14/2021 03:03 PM Trichloroethene 4.6 µg/Kg 1ND 0.47 9/14/2021 03:03 PM
Trichlorofluoromethane 4.6 µg/Kg 1ND 0.53 9/14/2021 03:03 PM Vinyl chloride 4.6 µg/Kg 1ND 0.35 9/14/2021 03:03 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1131 0 9/14/2021 03:03 PM Surr: 4-Bromofluorobenzene 69-124 %REC 191.8 0 9/14/2021 03:03 PM Surr: Dibromofluoromethane 72-142 %REC 1119 0 9/14/2021 03:03 PM Surr: Toluene-d8 75-124 %REC 195.5 0 9/14/2021 03:03 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 12 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3-20
Collection Date: 9/9/2021 9:20:00 AM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-005
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/13/2021 07:38 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 111 10 9/13/2021 07:38 PM Surr: p-Terphenyl 56-133 %REC 1123 0 9/13/2021 07:38 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210915B Q21VS118QC Batch: PrepDate: 9/15/2021 GRO (C6 - C12) J0.81 mg/Kg 10.21 0.20 9/16/2021 11:08 AM Surr: Chlorobenzene - d5 54-160 %REC 190.4 0 9/16/2021 11:08 AM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210913A 89255QC Batch: PrepDate: 9/11/2021 Mercury J0.10 mg/Kg 10.048 0.010 9/13/2021 09:58 AM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210911D 89254QC Batch: PrepDate: 9/11/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 08:34 PM
Arsenic 1.0 mg/Kg 1ND 0.54 9/13/2021 11:27 AM
Barium 1.0 mg/Kg 130 0.31 9/11/2021 08:34 PM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 08:34 PM
Cadmium J1.0 mg/Kg 10.33 0.27 9/11/2021 08:34 PM
Chromium 1.0 mg/Kg 19.6 0.32 9/13/2021 11:27 AM
Cobalt 1.0 mg/Kg 13.5 0.29 9/11/2021 08:34 PM
Copper 2.0 mg/Kg 14.3 0.89 9/11/2021 08:34 PM
Lead 1.0 mg/Kg 11.0 0.30 9/11/2021 08:34 PM
Molybdenum J1.0 mg/Kg 10.39 0.30 9/11/2021 08:34 PM
Nickel 1.0 mg/Kg 14.3 0.34 9/11/2021 08:34 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 08:34 PM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 08:34 PM
Thallium 2.0 mg/Kg 1ND 0.35 9/11/2021 08:34 PM
Vanadium 1.0 mg/Kg 120 0.22 9/11/2021 08:34 PM
Zinc 1.0 mg/Kg 117 0.30 9/11/2021 08:34 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 13 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-2.5
Collection Date: 9/9/2021 12:57:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-007
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 4.1 µg/Kg 1ND 0.42 9/14/2021 03:27 PM 1,1,1-Trichloroethane 4.1 µg/Kg 1ND 0.33 9/14/2021 03:27 PM 1,1,2,2-Tetrachloroethane 4.1 µg/Kg 1ND 0.19 9/14/2021 03:27 PM 1,1,2-Trichloroethane 4.1 µg/Kg 1ND 0.38 9/14/2021 03:27 PM 1,1-Dichloroethane 4.1 µg/Kg 1ND 0.36 9/14/2021 03:27 PM 1,1-Dichloroethene 4.1 µg/Kg 1ND 0.26 9/14/2021 03:27 PM 1,1-Dichloropropene 4.1 µg/Kg 1ND 0.26 9/14/2021 03:27 PM 1,2,3-Trichlorobenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 03:27 PM 1,2,3-Trichloropropane 4.1 µg/Kg 1ND 0.38 9/14/2021 03:27 PM 1,2,4-Trichlorobenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 03:27 PM 1,2,4-Trimethylbenzene 4.1 µg/Kg 1ND 0.098 9/14/2021 03:27 PM 1,2-Dibromo-3-chloropropane 8.2 µg/Kg 1ND 0.55 9/14/2021 03:27 PM 1,2-Dibromoethane 4.1 µg/Kg 1ND 0.30 9/14/2021 03:27 PM 1,2-Dichlorobenzene 4.1 µg/Kg 1ND 0.13 9/14/2021 03:27 PM 1,2-Dichloroethane 4.1 µg/Kg 1ND 0.27 9/14/2021 03:27 PM 1,2-Dichloropropane 4.1 µg/Kg 1ND 0.25 9/14/2021 03:27 PM 1,3,5-Trimethylbenzene 4.1 µg/Kg 1ND 0.45 9/14/2021 03:27 PM 1,3-Dichlorobenzene 4.1 µg/Kg 1ND 0.14 9/14/2021 03:27 PM 1,3-Dichloropropane 4.1 µg/Kg 1ND 0.21 9/14/2021 03:27 PM 1,4-Dichlorobenzene 4.1 µg/Kg 1ND 0.13 9/14/2021 03:27 PM 2,2-Dichloropropane 4.1 µg/Kg 1ND 0.32 9/14/2021 03:27 PM 2-Butanone 41 µg/Kg 1ND 7.6 9/14/2021 03:27 PM
2-Chlorotoluene 4.1 µg/Kg 1ND 0.14 9/14/2021 03:27 PM
4-Chlorotoluene 4.1 µg/Kg 1ND 0.11 9/14/2021 03:27 PM
4-Isopropyltoluene 4.1 µg/Kg 1ND 0.13 9/14/2021 03:27 PM Benzene 4.1 µg/Kg 1ND 0.17 9/14/2021 03:27 PM
Bromobenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 03:27 PM
Bromodichloromethane 4.1 µg/Kg 1ND 0.33 9/14/2021 03:27 PM Bromoform 4.1 µg/Kg 1ND 0.38 9/14/2021 03:27 PM
Bromomethane 4.1 µg/Kg 1ND 0.73 9/14/2021 03:27 PM
Carbon tetrachloride 4.1 µg/Kg 1ND 0.53 9/14/2021 03:27 PM Chlorobenzene 4.1 µg/Kg 1ND 0.18 9/14/2021 03:27 PM
Chloroethane 4.1 µg/Kg 1ND 1.4 9/14/2021 03:27 PM
Chloroform 4.1 µg/Kg 1ND 0.64 9/14/2021 03:27 PM
Chloromethane 4.1 µg/Kg 1ND 0.38 9/14/2021 03:27 PM
cis-1,2-Dichloroethene 4.1 µg/Kg 1ND 0.17 9/14/2021 03:27 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 14 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-2.5
Collection Date: 9/9/2021 12:57:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-007
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 4.1 µg/Kg 1ND 0.26 9/14/2021 03:27 PM Di-isopropyl ether 4.1 µg/Kg 1ND 0.23 9/14/2021 03:27 PM Dibromochloromethane 4.1 µg/Kg 1ND 0.36 9/14/2021 03:27 PM Dibromomethane 4.1 µg/Kg 1ND 0.22 9/14/2021 03:27 PM
Dichlorodifluoromethane 4.1 µg/Kg 1ND 0.63 9/14/2021 03:27 PM Ethyl Tert-butyl ether 4.1 µg/Kg 1ND 0.18 9/14/2021 03:27 PM Ethylbenzene 4.1 µg/Kg 1ND 0.18 9/14/2021 03:27 PM
Freon-113 4.1 µg/Kg 1ND 0.44 9/14/2021 03:27 PM
Hexachlorobutadiene 4.1 µg/Kg 1ND 0.48 9/14/2021 03:27 PM Isopropylbenzene 4.1 µg/Kg 1ND 0.15 9/14/2021 03:27 PM
m,p-Xylene 8.2 µg/Kg 1ND 0.37 9/14/2021 03:27 PM
Methylene chloride 4.1 µg/Kg 1ND 2.9 9/14/2021 03:27 PM MTBE 4.1 µg/Kg 1ND 0.70 9/14/2021 03:27 PM
n-Butylbenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 03:27 PM
n-Propylbenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 03:27 PM
Naphthalene 4.1 µg/Kg 1ND 0.31 9/14/2021 03:27 PM
o-Xylene 4.1 µg/Kg 1ND 0.14 9/14/2021 03:27 PM
sec-Butylbenzene 4.1 µg/Kg 1ND 0.14 9/14/2021 03:27 PM
Styrene 4.1 µg/Kg 1ND 0.96 9/14/2021 03:27 PM
Tert-amyl methyl ether 4.1 µg/Kg 1ND 0.21 9/14/2021 03:27 PM Tert-Butanol 20 µg/Kg 1ND 5.3 9/14/2021 03:27 PM
tert-Butylbenzene 4.1 µg/Kg 1ND 0.16 9/14/2021 03:27 PM Tetrachloroethene 4.1 µg/Kg 1ND 0.41 9/14/2021 03:27 PM Toluene 4.1 µg/Kg 1ND 0.24 9/14/2021 03:27 PM
trans-1,2-Dichloroethene 4.1 µg/Kg 1ND 0.44 9/14/2021 03:27 PM Trichloroethene 4.1 µg/Kg 1ND 0.42 9/14/2021 03:27 PM
Trichlorofluoromethane 4.1 µg/Kg 1ND 0.47 9/14/2021 03:27 PM Vinyl chloride 4.1 µg/Kg 1ND 0.31 9/14/2021 03:27 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1141 0 9/14/2021 03:27 PM Surr: 4-Bromofluorobenzene 69-124 %REC 191.0 0 9/14/2021 03:27 PM Surr: Dibromofluoromethane 72-142 %REC 1128 0 9/14/2021 03:27 PM Surr: Toluene-d8 75-124 %REC 197.7 0 9/14/2021 03:27 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 15 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-2.5
Collection Date: 9/9/2021 12:57:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-007
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 T/R Hydrocarbons: C13-C22 9.9 mg/Kg 1ND 9.9 9/13/2021 08:37 PM T/R Hydrocarbons: C23-C40 9.9 mg/Kg 149 9.9 9/13/2021 08:37 PM Surr: p-Terphenyl 56-133 %REC 1109 0 9/13/2021 08:37 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210915B Q21VS118QC Batch: PrepDate: 9/15/2021 GRO (C6 - C12) J0.81 mg/Kg 10.22 0.20 9/16/2021 11:41 AM Surr: Chlorobenzene - d5 54-160 %REC 185.9 0 9/16/2021 11:41 AM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210913A 89255QC Batch: PrepDate: 9/11/2021 Mercury J0.099 mg/Kg 10.069 0.0099 9/13/2021 10:02 AM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210916C 89254QC Batch: PrepDate: 9/11/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/16/2021 12:57 PM
Arsenic 1.0 mg/Kg 11.9 0.54 9/16/2021 07:10 PM
Barium 1.0 mg/Kg 190 0.31 9/16/2021 12:57 PM
Beryllium 1.0 mg/Kg 1ND 0.22 9/16/2021 12:57 PM
Cadmium J1.0 mg/Kg 10.63 0.27 9/16/2021 12:57 PM
Chromium 1.0 mg/Kg 121 0.32 9/16/2021 07:10 PM
Cobalt 1.0 mg/Kg 18.9 0.29 9/16/2021 12:57 PM
Copper 2.0 mg/Kg 115 0.89 9/16/2021 12:57 PM
Lead 1.0 mg/Kg 16.6 0.29 9/16/2021 12:57 PM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/16/2021 12:57 PM
Nickel 1.0 mg/Kg 115 0.34 9/16/2021 12:57 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/16/2021 12:57 PM
Silver 1.0 mg/Kg 1ND 0.62 9/16/2021 12:57 PM
Thallium 2.0 mg/Kg 1ND 0.35 9/16/2021 12:57 PM
Vanadium 1.0 mg/Kg 137 0.22 9/16/2021 12:57 PM
Zinc 1.0 mg/Kg 156 0.30 9/16/2021 12:57 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 16 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-5
Collection Date: 9/9/2021 1:03:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-008
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 4.3 µg/Kg 1ND 0.44 9/14/2021 03:51 PM 1,1,1-Trichloroethane 4.3 µg/Kg 1ND 0.34 9/14/2021 03:51 PM 1,1,2,2-Tetrachloroethane 4.3 µg/Kg 1ND 0.19 9/14/2021 03:51 PM 1,1,2-Trichloroethane 4.3 µg/Kg 1ND 0.39 9/14/2021 03:51 PM 1,1-Dichloroethane 4.3 µg/Kg 1ND 0.37 9/14/2021 03:51 PM 1,1-Dichloroethene 4.3 µg/Kg 1ND 0.27 9/14/2021 03:51 PM 1,1-Dichloropropene 4.3 µg/Kg 1ND 0.27 9/14/2021 03:51 PM 1,2,3-Trichlorobenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 03:51 PM 1,2,3-Trichloropropane 4.3 µg/Kg 1ND 0.40 9/14/2021 03:51 PM 1,2,4-Trichlorobenzene 4.3 µg/Kg 1ND 0.16 9/14/2021 03:51 PM 1,2,4-Trimethylbenzene 4.3 µg/Kg 1ND 0.10 9/14/2021 03:51 PM 1,2-Dibromo-3-chloropropane 8.5 µg/Kg 1ND 0.58 9/14/2021 03:51 PM 1,2-Dibromoethane 4.3 µg/Kg 1ND 0.31 9/14/2021 03:51 PM 1,2-Dichlorobenzene 4.3 µg/Kg 1ND 0.14 9/14/2021 03:51 PM 1,2-Dichloroethane 4.3 µg/Kg 1ND 0.28 9/14/2021 03:51 PM 1,2-Dichloropropane 4.3 µg/Kg 1ND 0.26 9/14/2021 03:51 PM 1,3,5-Trimethylbenzene 4.3 µg/Kg 1ND 0.47 9/14/2021 03:51 PM 1,3-Dichlorobenzene 4.3 µg/Kg 1ND 0.14 9/14/2021 03:51 PM 1,3-Dichloropropane 4.3 µg/Kg 1ND 0.22 9/14/2021 03:51 PM 1,4-Dichlorobenzene 4.3 µg/Kg 1ND 0.14 9/14/2021 03:51 PM 2,2-Dichloropropane 4.3 µg/Kg 1ND 0.33 9/14/2021 03:51 PM 2-Butanone 43 µg/Kg 1ND 8.0 9/14/2021 03:51 PM
2-Chlorotoluene 4.3 µg/Kg 1ND 0.15 9/14/2021 03:51 PM
4-Chlorotoluene 4.3 µg/Kg 1ND 0.12 9/14/2021 03:51 PM
4-Isopropyltoluene 4.3 µg/Kg 1ND 0.13 9/14/2021 03:51 PM Benzene 4.3 µg/Kg 1ND 0.18 9/14/2021 03:51 PM
Bromobenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 03:51 PM
Bromodichloromethane 4.3 µg/Kg 1ND 0.35 9/14/2021 03:51 PM Bromoform 4.3 µg/Kg 1ND 0.39 9/14/2021 03:51 PM
Bromomethane 4.3 µg/Kg 1ND 0.77 9/14/2021 03:51 PM
Carbon tetrachloride 4.3 µg/Kg 1ND 0.55 9/14/2021 03:51 PM Chlorobenzene 4.3 µg/Kg 1ND 0.18 9/14/2021 03:51 PM
Chloroethane 4.3 µg/Kg 1ND 1.4 9/14/2021 03:51 PM
Chloroform 4.3 µg/Kg 1ND 0.67 9/14/2021 03:51 PM
Chloromethane 4.3 µg/Kg 1ND 0.39 9/14/2021 03:51 PM
cis-1,2-Dichloroethene 4.3 µg/Kg 1ND 0.18 9/14/2021 03:51 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 17 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-5
Collection Date: 9/9/2021 1:03:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-008
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 4.3 µg/Kg 1ND 0.27 9/14/2021 03:51 PM Di-isopropyl ether 4.3 µg/Kg 1ND 0.24 9/14/2021 03:51 PM Dibromochloromethane 4.3 µg/Kg 1ND 0.38 9/14/2021 03:51 PM Dibromomethane 4.3 µg/Kg 1ND 0.23 9/14/2021 03:51 PM
Dichlorodifluoromethane 4.3 µg/Kg 1ND 0.66 9/14/2021 03:51 PM Ethyl Tert-butyl ether 4.3 µg/Kg 1ND 0.19 9/14/2021 03:51 PM Ethylbenzene 4.3 µg/Kg 1ND 0.19 9/14/2021 03:51 PM
Freon-113 4.3 µg/Kg 1ND 0.47 9/14/2021 03:51 PM
Hexachlorobutadiene 4.3 µg/Kg 1ND 0.50 9/14/2021 03:51 PM Isopropylbenzene 4.3 µg/Kg 1ND 0.16 9/14/2021 03:51 PM
m,p-Xylene 8.5 µg/Kg 1ND 0.38 9/14/2021 03:51 PM
Methylene chloride 4.3 µg/Kg 1ND 3.1 9/14/2021 03:51 PM MTBE 4.3 µg/Kg 1ND 0.73 9/14/2021 03:51 PM
n-Butylbenzene 4.3 µg/Kg 1ND 0.16 9/14/2021 03:51 PM
n-Propylbenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 03:51 PM
Naphthalene 4.3 µg/Kg 1ND 0.32 9/14/2021 03:51 PM
o-Xylene 4.3 µg/Kg 1ND 0.15 9/14/2021 03:51 PM
sec-Butylbenzene 4.3 µg/Kg 1ND 0.14 9/14/2021 03:51 PM
Styrene 4.3 µg/Kg 1ND 1.0 9/14/2021 03:51 PM
Tert-amyl methyl ether 4.3 µg/Kg 1ND 0.22 9/14/2021 03:51 PM Tert-Butanol 21 µg/Kg 1ND 5.5 9/14/2021 03:51 PM
tert-Butylbenzene 4.3 µg/Kg 1ND 0.17 9/14/2021 03:51 PM Tetrachloroethene 4.3 µg/Kg 1ND 0.42 9/14/2021 03:51 PM Toluene 4.3 µg/Kg 1ND 0.25 9/14/2021 03:51 PM
trans-1,2-Dichloroethene 4.3 µg/Kg 1ND 0.46 9/14/2021 03:51 PM Trichloroethene 4.3 µg/Kg 1ND 0.43 9/14/2021 03:51 PM
Trichlorofluoromethane 4.3 µg/Kg 1ND 0.49 9/14/2021 03:51 PM Vinyl chloride 4.3 µg/Kg 1ND 0.32 9/14/2021 03:51 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1129 0 9/14/2021 03:51 PM Surr: 4-Bromofluorobenzene 69-124 %REC 192.0 0 9/14/2021 03:51 PM Surr: Dibromofluoromethane 72-142 %REC 1116 0 9/14/2021 03:51 PM Surr: Toluene-d8 75-124 %REC 195.7 0 9/14/2021 03:51 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 18 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-5
Collection Date: 9/9/2021 1:03:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-008
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/13/2021 09:06 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 140 10 9/13/2021 09:06 PM Surr: p-Terphenyl 56-133 %REC 1110 0 9/13/2021 09:06 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210915B Q21VS118QC Batch: PrepDate: 9/15/2021 GRO (C6 - C12) J0.80 mg/Kg 10.20 0.20 9/16/2021 12:13 PM Surr: Chlorobenzene - d5 54-160 %REC 185.4 0 9/16/2021 12:13 PM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210913A 89255QC Batch: PrepDate: 9/11/2021 Mercury J0.10 mg/Kg 10.048 0.010 9/13/2021 10:05 AM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210911D 89254QC Batch: PrepDate: 9/11/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 09:08 PM
Arsenic 1.0 mg/Kg 12.8 0.54 9/13/2021 11:36 AM
Barium 1.0 mg/Kg 168 0.31 9/11/2021 09:08 PM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 09:08 PM
Cadmium J1.0 mg/Kg 10.62 0.27 9/11/2021 09:08 PM
Chromium 1.0 mg/Kg 120 0.32 9/13/2021 11:36 AM
Cobalt 1.0 mg/Kg 17.4 0.29 9/11/2021 09:08 PM
Copper 2.0 mg/Kg 115 0.89 9/11/2021 09:08 PM
Lead 1.0 mg/Kg 15.5 0.30 9/11/2021 09:08 PM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/11/2021 09:08 PM
Nickel 1.0 mg/Kg 114 0.34 9/11/2021 09:08 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 09:08 PM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 09:08 PM
Thallium 2.0 mg/Kg 1ND 0.35 9/11/2021 09:08 PM
Vanadium 1.0 mg/Kg 134 0.22 9/11/2021 09:08 PM
Zinc 1.0 mg/Kg 134 0.30 9/11/2021 09:08 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 19 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-10
Collection Date: 9/9/2021 1:29:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-009
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 1,1,1,2-Tetrachloroethane 5.1 µg/Kg 1ND 0.52 9/14/2021 04:16 PM 1,1,1-Trichloroethane 5.1 µg/Kg 1ND 0.41 9/14/2021 04:16 PM 1,1,2,2-Tetrachloroethane 5.1 µg/Kg 1ND 0.23 9/14/2021 04:16 PM 1,1,2-Trichloroethane 5.1 µg/Kg 1ND 0.47 9/14/2021 04:16 PM 1,1-Dichloroethane 5.1 µg/Kg 1ND 0.45 9/14/2021 04:16 PM 1,1-Dichloroethene 5.1 µg/Kg 1ND 0.33 9/14/2021 04:16 PM 1,1-Dichloropropene 5.1 µg/Kg 1ND 0.33 9/14/2021 04:16 PM 1,2,3-Trichlorobenzene 5.1 µg/Kg 1ND 0.20 9/14/2021 04:16 PM 1,2,3-Trichloropropane 5.1 µg/Kg 1ND 0.47 9/14/2021 04:16 PM 1,2,4-Trichlorobenzene 5.1 µg/Kg 1ND 0.19 9/14/2021 04:16 PM 1,2,4-Trimethylbenzene 5.1 µg/Kg 1ND 0.12 9/14/2021 04:16 PM 1,2-Dibromo-3-chloropropane 10 µg/Kg 1ND 0.69 9/14/2021 04:16 PM 1,2-Dibromoethane 5.1 µg/Kg 1ND 0.37 9/14/2021 04:16 PM 1,2-Dichlorobenzene 5.1 µg/Kg 1ND 0.16 9/14/2021 04:16 PM 1,2-Dichloroethane 5.1 µg/Kg 1ND 0.33 9/14/2021 04:16 PM 1,2-Dichloropropane 5.1 µg/Kg 1ND 0.31 9/14/2021 04:16 PM 1,3,5-Trimethylbenzene 5.1 µg/Kg 1ND 0.56 9/14/2021 04:16 PM 1,3-Dichlorobenzene 5.1 µg/Kg 1ND 0.17 9/14/2021 04:16 PM 1,3-Dichloropropane 5.1 µg/Kg 1ND 0.26 9/14/2021 04:16 PM 1,4-Dichlorobenzene 5.1 µg/Kg 1ND 0.16 9/14/2021 04:16 PM 2,2-Dichloropropane 5.1 µg/Kg 1ND 0.39 9/14/2021 04:16 PM 2-Butanone 51 µg/Kg 1ND 9.5 9/14/2021 04:16 PM
2-Chlorotoluene 5.1 µg/Kg 1ND 0.17 9/14/2021 04:16 PM
4-Chlorotoluene 5.1 µg/Kg 1ND 0.14 9/14/2021 04:16 PM
4-Isopropyltoluene 5.1 µg/Kg 1ND 0.16 9/14/2021 04:16 PM Benzene 5.1 µg/Kg 1ND 0.22 9/14/2021 04:16 PM
Bromobenzene 5.1 µg/Kg 1ND 0.20 9/14/2021 04:16 PM
Bromodichloromethane 5.1 µg/Kg 1ND 0.42 9/14/2021 04:16 PM Bromoform 5.1 µg/Kg 1ND 0.47 9/14/2021 04:16 PM
Bromomethane 5.1 µg/Kg 1ND 0.91 9/14/2021 04:16 PM
Carbon tetrachloride 5.1 µg/Kg 1ND 0.66 9/14/2021 04:16 PM Chlorobenzene 5.1 µg/Kg 1ND 0.22 9/14/2021 04:16 PM
Chloroethane 5.1 µg/Kg 1ND 1.7 9/14/2021 04:16 PM
Chloroform 5.1 µg/Kg 1ND 0.80 9/14/2021 04:16 PM
Chloromethane 5.1 µg/Kg 1ND 0.47 9/14/2021 04:16 PM
cis-1,2-Dichloroethene 5.1 µg/Kg 1ND 0.21 9/14/2021 04:16 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 20 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-10
Collection Date: 9/9/2021 1:29:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-009
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210914A R21VS051QC Batch: PrepDate: 9/14/2021 cis-1,3-Dichloropropene 5.1 µg/Kg 1ND 0.32 9/14/2021 04:16 PM Di-isopropyl ether 5.1 µg/Kg 1ND 0.28 9/14/2021 04:16 PM Dibromochloromethane 5.1 µg/Kg 1ND 0.45 9/14/2021 04:16 PM Dibromomethane 5.1 µg/Kg 1ND 0.27 9/14/2021 04:16 PM
Dichlorodifluoromethane 5.1 µg/Kg 1ND 0.78 9/14/2021 04:16 PM Ethyl Tert-butyl ether 5.1 µg/Kg 1ND 0.23 9/14/2021 04:16 PM Ethylbenzene 5.1 µg/Kg 1ND 0.23 9/14/2021 04:16 PM
Freon-113 5.1 µg/Kg 1ND 0.55 9/14/2021 04:16 PM
Hexachlorobutadiene 5.1 µg/Kg 1ND 0.60 9/14/2021 04:16 PM Isopropylbenzene 5.1 µg/Kg 1ND 0.19 9/14/2021 04:16 PM
m,p-Xylene 10 µg/Kg 1ND 0.46 9/14/2021 04:16 PM
Methylene chloride 5.1 µg/Kg 1ND 3.6 9/14/2021 04:16 PM MTBE 5.1 µg/Kg 1ND 0.88 9/14/2021 04:16 PM
n-Butylbenzene 5.1 µg/Kg 1ND 0.20 9/14/2021 04:16 PM
n-Propylbenzene 5.1 µg/Kg 1ND 0.20 9/14/2021 04:16 PM
Naphthalene 5.1 µg/Kg 1ND 0.39 9/14/2021 04:16 PM
o-Xylene 5.1 µg/Kg 1ND 0.18 9/14/2021 04:16 PM
sec-Butylbenzene 5.1 µg/Kg 1ND 0.17 9/14/2021 04:16 PM
Styrene 5.1 µg/Kg 1ND 1.2 9/14/2021 04:16 PM
Tert-amyl methyl ether 5.1 µg/Kg 1ND 0.26 9/14/2021 04:16 PM Tert-Butanol 25 µg/Kg 1ND 6.6 9/14/2021 04:16 PM
tert-Butylbenzene 5.1 µg/Kg 1ND 0.20 9/14/2021 04:16 PM Tetrachloroethene 5.1 µg/Kg 1ND 0.51 9/14/2021 04:16 PM Toluene 5.1 µg/Kg 1ND 0.29 9/14/2021 04:16 PM
trans-1,2-Dichloroethene 5.1 µg/Kg 1ND 0.55 9/14/2021 04:16 PM Trichloroethene 5.1 µg/Kg 1ND 0.52 9/14/2021 04:16 PM
Trichlorofluoromethane 5.1 µg/Kg 1ND 0.58 9/14/2021 04:16 PM Vinyl chloride 5.1 µg/Kg 1ND 0.39 9/14/2021 04:16 PM
Surr: 1,2-Dichloroethane-d4 64-165 %REC 1130 0 9/14/2021 04:16 PM Surr: 4-Bromofluorobenzene 69-124 %REC 192.6 0 9/14/2021 04:16 PM Surr: Dibromofluoromethane 72-142 %REC 1119 0 9/14/2021 04:16 PM Surr: Toluene-d8 75-124 %REC 199.7 0 9/14/2021 04:16 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 21 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4-10
Collection Date: 9/9/2021 1:29:00 PM
Matrix: SOIL
CLIENT: Kleinfelder
Lab Order: N047070
Lab ID: N047070-009
ASSET Laboratories Print Date: 17-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3550B
RunID: NV00922-GC1_210913B 89263QC Batch: PrepDate: 9/13/2021 T/R Hydrocarbons: C13-C22 10 mg/Kg 1ND 10 9/13/2021 08:07 PM T/R Hydrocarbons: C23-C40 10 mg/Kg 1ND 10 9/13/2021 08:07 PM Surr: p-Terphenyl 56-133 %REC 1113 0 9/13/2021 08:07 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC12_210915B Q21VS118QC Batch: PrepDate: 9/15/2021 GRO (C6 - C12) J0.97 mg/Kg 10.26 0.24 9/16/2021 12:46 PM Surr: Chlorobenzene - d5 54-160 %REC 187.3 0 9/16/2021 12:46 PM

TOTAL MERCURY BY COLD VAPOR TECHNIQUE
EPA 7471A
Analyst: DJRunID: NV00922-AA2_210913A 89255QC Batch: PrepDate: 9/11/2021 Mercury J0.099 mg/Kg 10.047 0.0099 9/13/2021 10:08 AM

TOTAL METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3050B
RunID: NV00922-ICP2_210911D 89254QC Batch: PrepDate: 9/11/2021 Antimony 2.0 mg/Kg 1ND 0.33 9/11/2021 09:14 PM
Arsenic 1.0 mg/Kg 1ND 0.54 9/13/2021 11:48 AM
Barium 1.0 mg/Kg 130 0.31 9/11/2021 09:14 PM
Beryllium 1.0 mg/Kg 1ND 0.22 9/11/2021 09:14 PM
Cadmium J1.0 mg/Kg 10.37 0.27 9/11/2021 09:14 PM
Chromium 1.0 mg/Kg 17.9 0.32 9/13/2021 11:48 AM
Cobalt 1.0 mg/Kg 14.7 0.29 9/11/2021 09:14 PM
Copper 2.0 mg/Kg 15.5 0.89 9/11/2021 09:14 PM
Lead 1.0 mg/Kg 11.4 0.29 9/11/2021 09:14 PM
Molybdenum 1.0 mg/Kg 1ND 0.30 9/11/2021 09:14 PM
Nickel 1.0 mg/Kg 15.4 0.34 9/11/2021 09:14 PM
Selenium 1.0 mg/Kg 1ND 0.60 9/11/2021 09:14 PM
Silver 1.0 mg/Kg 1ND 0.62 9/11/2021 09:14 PM
Thallium 2.0 mg/Kg 1ND 0.35 9/11/2021 09:14 PM
Vanadium 1.0 mg/Kg 125 0.22 9/11/2021 09:14 PM
Zinc 1.0 mg/Kg 117 0.30 9/11/2021 09:14 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 22 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

17-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_S
Sample ID: MB-89254
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/11/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156599
SeqNo: 4346716
MBLKSampType: TestCode: 6010_S
EPA 3050B
Antimony 2.0ND
Barium 1.0ND
Beryllium 1.0ND
Cadmium 1.0ND
Cobalt 1.0ND
Copper 2.0ND
Lead 1.0ND
Molybdenum 1.0ND
Nickel 1.0ND
Selenium 1.0ND
Silver 1.0ND
Thallium 2.0ND
Vanadium 1.0ND
Zinc 1.0ND
Sample ID: LCS-89254
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/11/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156599
SeqNo: 4346717
LCSSampType: TestCode: 6010_S
EPA 3050B
Antimony 25.00 108 80 1202.0 026.982
Barium 25.00 110 80 1201.0 027.377
Beryllium 25.00 106 80 1201.0 026.573
Cadmium 25.00 106 80 1201.0 026.398
Cobalt 25.00 105 80 1201.0 026.366
Copper 25.00 106 80 1202.0 026.465
Lead 25.00 107 80 1201.0 026.792
Molybdenum 25.00 110 80 1201.0 027.416
Nickel 25.00 107 80 1201.0 026.832
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 23 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_S
Sample ID: LCS-89254
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/11/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156599
SeqNo: 4346717
LCSSampType: TestCode: 6010_S
EPA 3050B
Selenium 25.00 103 80 1201.0 025.781
Silver 25.00 112 80 1201.0 027.920
Thallium 25.00 104 80 1202.0 025.892
Vanadium 25.00 106 80 1201.0 026.577
Zinc 25.00 106 80 1201.0 026.574
Sample ID: N047061-001A-DUP
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/11/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156599
SeqNo: 4346722
DUPSampType: TestCode: 6010_S
EPA 3050B
Antimony 202.0 0 0ND
Barium 201.0 98.24 0.33597.913
Beryllium 201.0 0 0ND
Cadmium 20 J1.0 0.5778 00.557
Cobalt 201.0 8.434 4.308.079
Copper 202.0 18.58 6.5317.401
Lead 20 R1.0 31.78 44.620.186
Molybdenum 201.0 0 0ND
Nickel 201.0 13.16 6.5512.325
Selenium 201.0 0 0ND
Silver 201.0 0 0ND
Thallium 202.0 0 0ND
Vanadium 201.0 29.66 4.8728.248
Zinc 201.0 54.37 0.34154.181
Sample ID: N047061-001A-MS
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/11/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156599
SeqNo: 4346724
MSSampType: TestCode: 6010_S
EPA 3050B
Antimony 24.99 66.9 75 125 S2.0 016.705
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 24 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_S
Sample ID: N047061-001A-MS
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/11/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156599
SeqNo: 4346724
MSSampType: TestCode: 6010_S
EPA 3050B
Barium 24.99 82.3 75 1251.0 98.24118.813
Beryllium 24.99 68.0 75 125 S1.0 016.997
Cadmium 24.99 65.0 75 125 S1.0 0.577816.825
Cobalt 24.99 73.8 75 125 S1.0 8.43426.871
Copper 24.99 85.5 75 1252.0 18.5839.949
Lead 24.99 34.8 75 125 S1.0 31.7840.487
Molybdenum 24.99 73.4 75 125 S1.0 018.329
Nickel 24.99 68.1 75 125 S1.0 13.1630.181
Selenium 24.99 55.5 75 125 S1.0 013.860
Silver 24.99 80.7 75 1251.0 020.162
Thallium 24.99 62.1 75 125 S2.0 015.522
Vanadium 24.99 79.0 75 1251.0 29.6649.389
Zinc 24.99 81.4 75 1251.0 54.3774.708
Sample ID: N047061-001A-MSD
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/11/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156599
SeqNo: 4346725
MSDSampType: TestCode: 6010_S
EPA 3050B
Antimony 24.98 68.2 75 125 20 S2.0 0 16.71 1.9917.041
Barium 24.98 134 75 125 20 S1.0 98.24 118.8 10.3131.658 Beryllium 24.98 70.1 75 125 20 S1.0 0 17.00 2.9717.510
Cadmium 24.98 67.2 75 125 20 S1.0 0.5778 16.83 3.0717.349 Cobalt 24.98 77.4 75 125 201.0 8.434 26.87 3.2927.771
Copper 24.98 92.2 75 125 202.0 18.58 39.95 4.0541.601
Lead 24.98 40.0 75 125 20 S1.0 31.78 40.49 3.1141.766
Molybdenum 24.98 75.5 75 125 201.0 0 18.33 2.8018.850
Nickel 24.98 70.9 75 125 20 S1.0 13.16 30.18 2.2230.858 Selenium 24.98 56.8 75 125 20 S1.0 0 13.86 2.3314.187
Silver 24.98 83.4 75 125 201.0 0 20.16 3.2120.819
Thallium 24.98 63.5 75 125 20 S2.0 0 15.52 2.1315.856
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 25 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_S
Sample ID: N047061-001A-MSD
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/11/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156599
SeqNo: 4346725
MSDSampType: TestCode: 6010_S
EPA 3050B
Vanadium 24.98 90.6 75 125 201.0 29.66 49.39 5.7152.290 Zinc 24.98 103 75 125 201.0 54.37 74.71 7.0680.177
Sample ID: MB-89254
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156621
SeqNo: 4348353
MBLKSampType: TestCode: 6010_S
EPA 3050B
Arsenic 1.0ND
Chromium 1.0ND
Sample ID: LCS-89254
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156621
SeqNo: 4348354
LCSSampType: TestCode: 6010_S
EPA 3050B
Arsenic 25.00 110 80 1201.0 027.464
Chromium 25.00 104 80 1201.0 026.112
Sample ID: N047061-001A-DUP
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156621
SeqNo: 4348357
DUPSampType: TestCode: 6010_S
EPA 3050B
Arsenic 201.0 0 0ND
Chromium 201.0 16.23 5.0015.435
Sample ID: N047061-001A-MS
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156621
SeqNo: 4348367
MSSampType: TestCode: 6010_S
EPA 3050B
Arsenic 24.99 80.6 75 1251.0 020.143
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 26 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_S
Sample ID: N047061-001A-MS
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156621
SeqNo: 4348367
MSSampType: TestCode: 6010_S
EPA 3050B
Chromium 24.99 77.2 75 1251.0 16.2335.517
Sample ID: N047061-001A-MSD
Batch ID: 89254 TestNo: EPA 6010B Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156621
SeqNo: 4348368
MSDSampType: TestCode: 6010_S
EPA 3050B
Arsenic 24.98 79.7 75 125 201.0 0 20.14 1.2419.895
Chromium 24.98 77.8 75 125 201.0 16.23 35.52 0.37435.650 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 27 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 7471_S
Sample ID: MB-89255
Batch ID: 89255 TestNo: EPA 7471A Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156615
SeqNo: 4347903
MBLKSampType: TestCode: 7471_S
Mercury J0.100.011
Sample ID: LCS-89255
Batch ID: 89255 TestNo: EPA 7471A Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156615
SeqNo: 4347904
LCSSampType: TestCode: 7471_S
Mercury 0.4167 106 80 1200.10 00.440
Sample ID: N047062-001A-MS
Batch ID: 89255 TestNo: EPA 7471A Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156615
SeqNo: 4347909
MSSampType: TestCode: 7471_S
Mercury 0.4105 111 75 1250.099 0.012060.469
Sample ID: N047062-001A-MSD
Batch ID: 89255 TestNo: EPA 7471A Analysis Date: 9/13/2021 Prep Date: 9/11/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156615
SeqNo: 4347910
MSDSampType: TestCode: 7471_S
Mercury 0.4153 90.7 75 125 200.10 0.01206 0.4688 18.70.389 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 28 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8015GAS_5035C6C12
Sample ID: Q210915LCS
Batch ID: Q21VS118 TestNo: EPA 8015B Analysis Date: 9/16/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS
RunNo: 156695
SeqNo: 4352987
LCSSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 5.000 89.1 79 1341.0 04.455
Surr: Chlorobenzene - d5 100.0 85.5 54 16085.533
Sample ID: Q210915LCSD
Batch ID: Q21VS118 TestNo: EPA 8015B Analysis Date: 9/16/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: LCSS02
RunNo: 156695
SeqNo: 4352988
LCSDSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 5.000 87.2 79 134 201.0 0 4.455 2.184.359 Surr: Chlorobenzene - d5 100.0 88.7 54 160 088.702
Sample ID: Q210915MB
Batch ID: Q21VS118 TestNo: EPA 8015B Analysis Date: 9/16/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156695
SeqNo: 4352989
MBLKSampType: TestCode: 8015GAS_503
GRO (C6 - C12) J1.00.298
Surr: Chlorobenzene - d5 100.0 93.0 54 16093.040
Sample ID: N047112-005AMSD
Batch ID: Q21VS118 TestNo: EPA 8015B Analysis Date: 9/16/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156695
SeqNo: 4352992
MSDSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 5.000 68.1 25 166 20 R1.0 0 4.260 22.33.405 Surr: Chlorobenzene - d5 100.0 61.8 54 160 061.755
Sample ID: N047112-005AMS
Batch ID: Q21VS118 TestNo: EPA 8015B Analysis Date: 9/16/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156695
SeqNo: 4352999
MSSampType: TestCode: 8015GAS_503
GRO (C6 - C12) 5.000 85.2 25 1661.0 04.260
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 29 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8015GAS_5035C6C12
Sample ID: N047112-005AMS
Batch ID: Q21VS118 TestNo: EPA 8015B Analysis Date: 9/16/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156695
SeqNo: 4352999
MSSampType: TestCode: 8015GAS_503
Surr: Chlorobenzene - d5 100.0 85.1 54 16085.138
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 30 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-LCS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156639
SeqNo: 4350427
LCSSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 111 76 1255.0 044.280
1,1,1-Trichloroethane 40.00 112 76 1245.0 044.780
1,1,2,2-Tetrachloroethane 40.00 95.5 71 1205.0 038.200
1,1,2-Trichloroethane 40.00 101 71 1205.0 040.520
1,1-Dichloroethane 40.00 100 74 1275.0 040.000
1,1-Dichloroethene 40.00 109 72 1235.0 043.760
1,1-Dichloropropene 40.00 120 80 1275.0 048.100
1,2,3-Trichlorobenzene 40.00 110 76 1235.0 043.980
1,2,3-Trichloropropane 40.00 107 69 1195.0 042.720
1,2,4-Trichlorobenzene 40.00 107 76 1225.0 042.930
1,2,4-Trimethylbenzene 40.00 108 80 1325.0 043.340
1,2-Dibromo-3-chloropropane 40.00 104 64 13010 041.750
1,2-Dibromoethane 40.00 108 73 1215.0 043.210
1,2-Dichlorobenzene 40.00 110 80 1205.0 043.990
1,2-Dichloroethane 40.00 106 76 1215.0 042.330
1,2-Dichloropropane 40.00 102 76 1205.0 040.930
1,3,5-Trimethylbenzene 40.00 108 80 1295.0 043.320
1,3-Dichlorobenzene 40.00 114 80 1205.0 045.510
1,3-Dichloropropane 40.00 103 76 1205.0 041.350
1,4-Dichlorobenzene 40.00 110 80 1205.0 043.810
2,2-Dichloropropane 40.00 110 68 1325.0 044.070
2-Butanone 400.0 103 34 14950 0411.860
2-Chlorotoluene 40.00 117 80 1225.0 046.700
4-Chlorotoluene 40.00 118 79 1245.0 047.190
4-Isopropyltoluene 40.00 106 80 1335.0 042.590
Benzene 40.00 112 80 1205.0 044.980
Bromobenzene 40.00 107 80 1205.0 042.930
Bromodichloromethane 40.00 106 76 1205.0 042.600
Bromoform 40.00 112 70 1315.0 044.910
Bromomethane 40.00 119 62 1445.0 047.780
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 31 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-LCS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156639
SeqNo: 4350427
LCSSampType: TestCode: 8260SOIL503
Carbon tetrachloride 40.00 124 72 1365.0 049.670
Chlorobenzene 40.00 112 80 1205.0 044.780
Chloroethane 40.00 106 64 1555.0 042.500
Chloroform 40.00 103 76 1215.0 041.090
Chloromethane 40.00 94.2 56 1425.0 037.690
cis-1,2-Dichloroethene 40.00 104 76 1205.0 041.510
cis-1,3-Dichloropropene 40.00 104 73 1205.0 041.580
Di-isopropyl ether 40.00 93.9 68 1305.0 037.570
Dibromochloromethane 40.00 108 76 1235.0 043.100
Dibromomethane 40.00 101 77 1205.0 040.490
Dichlorodifluoromethane 40.00 98.6 51 1525.0 039.460
Ethyl Tert-butyl ether 40.00 115 72 1265.0 046.050
Ethylbenzene 40.00 119 80 1205.0 047.490
Freon-113 40.00 111 57 1365.0 044.590
Hexachlorobutadiene 40.00 112 77 1225.0 044.900
Isopropylbenzene 40.00 105 79 1285.0 041.870
m,p-Xylene 80.00 118 69 14110 094.400
Methylene chloride 40.00 96.1 70 1245.0 038.440
MTBE 40.00 97.8 69 1245.0 039.120
n-Butylbenzene 40.00 105 80 1315.0 042.120
n-Propylbenzene 40.00 113 80 1275.0 045.250
Naphthalene 40.00 88.2 65 1275.0 035.270
o-Xylene 40.00 110 77 1235.0 044.140
sec-Butylbenzene 40.00 106 80 1305.0 042.580
Styrene 40.00 106 80 1245.0 042.490
Tert-amyl methyl ether 40.00 118 71 1225.0 047.340
Tert-Butanol 200.0 94.2 44 14325 0188.320
tert-Butylbenzene 40.00 106 80 1255.0 042.420
Tetrachloroethene 40.00 119 80 1225.0 047.740
Toluene 40.00 115 80 1205.0 046.120
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 32 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-LCS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: LCSS
RunNo: 156639
SeqNo: 4350427
LCSSampType: TestCode: 8260SOIL503
trans-1,2-Dichloroethene 40.00 102 71 1255.0 040.780
Trichloroethene 40.00 113 76 1215.0 045.290
Trichlorofluoromethane 40.00 109 66 1635.0 043.710
Vinyl chloride 40.00 103 65 1415.0 041.230
Surr: 1,2-Dichloroethane-d4 50.00 93.3 64 16546.670
Surr: 4-Bromofluorobenzene 50.00 98.4 69 12449.200
Surr: Dibromofluoromethane 50.00 94.3 72 14247.150
Surr: Toluene-d8 50.00 95.5 75 12447.740
Sample ID: N047080-001A-MS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350428
MSSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 94.8 62 1395.0 037.930
1,1,1-Trichloroethane 40.00 86.0 56 1545.0 034.380
1,1,2,2-Tetrachloroethane 40.00 95.3 42 1755.0 038.120
1,1,2-Trichloroethane 40.00 98.5 55 1665.0 039.400
1,1-Dichloroethane 40.00 82.1 46 1635.0 032.830
1,1-Dichloroethene 40.00 81.8 49 1575.0 032.730
1,1-Dichloropropene 40.00 91.8 59 1555.0 036.700
1,2,3-Trichlorobenzene 40.00 114 38 1545.0 045.750
1,2,3-Trichloropropane 40.00 103 49 1745.0 041.290
1,2,4-Trichlorobenzene 40.00 109 38 1465.0 043.540
1,2,4-Trimethylbenzene 40.00 87.7 41 1575.0 035.090
1,2-Dibromo-3-chloropropane 40.00 111 48 18510 044.560
1,2-Dibromoethane 40.00 108 54 1695.0 043.070
1,2-Dichlorobenzene 40.00 101 59 1365.0 040.210
1,2-Dichloroethane 40.00 99.7 54 1645.0 039.860
1,2-Dichloropropane 40.00 89.5 60 1425.0 035.810
1,3,5-Trimethylbenzene 40.00 84.3 44 1515.0 033.710
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 33 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350428
MSSampType: TestCode: 8260SOIL503
1,3-Dichlorobenzene 40.00 98.4 57 1335.0 039.340
1,3-Dichloropropane 40.00 103 63 1525.0 041.000
1,4-Dichlorobenzene 40.00 95.0 57 1335.0 037.990
2,2-Dichloropropane 40.00 82.5 50 1565.0 033.000
2-Butanone 400.0 114 37 19250 0454.580
2-Chlorotoluene 40.00 94.6 52 1405.0 037.860
4-Chlorotoluene 40.00 98.5 57 1355.0 039.400
4-Isopropyltoluene 40.00 81.1 46 1525.0 032.450
Benzene 40.00 90.3 59 1475.0 036.130
Bromobenzene 40.00 98.8 66 1315.0 039.530
Bromodichloromethane 40.00 93.8 54 1525.0 037.540
Bromoform 40.00 108 50 1765.0 043.360
Bromomethane 40.00 89.5 40 1785.0 035.790
Carbon tetrachloride 40.00 88.6 55 1595.0 035.450
Chlorobenzene 40.00 93.5 62 1375.0 037.390
Chloroethane 40.00 79.6 41 1735.0 031.820
Chloroform 40.00 86.8 50 1575.0 034.720
Chloromethane 40.00 73.3 41 1655.0 029.310
cis-1,2-Dichloroethene 40.00 90.4 48 1585.0 036.140
cis-1,3-Dichloropropene 40.00 94.7 59 1465.0 037.890
Di-isopropyl ether 40.00 87.4 44 1655.0 034.970
Dibromochloromethane 40.00 101 62 1515.0 040.310
Dibromomethane 40.00 98.4 52 1705.0 039.360
Dichlorodifluoromethane 40.00 66.1 36 1755.0 026.420
Ethyl Tert-butyl ether 40.00 106 52 1615.0 042.480
Ethylbenzene 40.00 93.9 55 1415.0 037.550
Freon-113 40.00 79.7 44 1615.0 031.880
Hexachlorobutadiene 40.00 93.4 34 1425.0 037.350
Isopropylbenzene 40.00 81.1 54 1435.0 032.440
m,p-Xylene 80.00 93.3 51 15010 074.660
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 34 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MS
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350428
MSSampType: TestCode: 8260SOIL503
Methylene chloride 40.00 84.8 49 1595.0 033.940
MTBE 40.00 97.7 43 1795.0 039.090
n-Butylbenzene 40.00 80.1 42 1525.0 032.020
n-Propylbenzene 40.00 87.7 54 1405.0 035.080
Naphthalene 40.00 101 37 1725.0 040.400
o-Xylene 40.00 91.0 49 1465.0 036.390
sec-Butylbenzene 40.00 80.7 51 1455.0 032.280
Styrene 40.00 90.7 57 1455.0 036.260
Tert-amyl methyl ether 40.00 109 58 1565.0 043.670
Tert-Butanol 200.0 101 40 18925 0201.220
tert-Butylbenzene 40.00 81.7 55 1405.0 032.690
Tetrachloroethene 40.00 92.7 59 1425.0 037.080
Toluene 40.00 92.1 54 1485.0 036.850
trans-1,2-Dichloroethene 40.00 83.4 46 1575.0 033.360
Trichloroethene 40.00 90.7 52 1615.0 036.290
Trichlorofluoromethane 40.00 79.0 43 1815.0 031.610
Vinyl chloride 40.00 73.6 52 1605.0 029.460
Surr: 1,2-Dichloroethane-d4 50.00 96.5 64 16548.240
Surr: 4-Bromofluorobenzene 50.00 99.8 69 12449.910
Surr: Dibromofluoromethane 50.00 98.8 72 14249.390
Surr: Toluene-d8 50.00 95.5 75 12447.740
Sample ID: N047080-001A-MSD
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350429
MSDSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 40.00 94.6 62 139 205.0 0 37.93 0.18537.860 1,1,1-Trichloroethane 40.00 81.7 56 154 205.0 0 34.38 5.0732.680 1,1,2,2-Tetrachloroethane 40.00 90.5 42 175 205.0 0 38.12 5.1436.210 1,1,2-Trichloroethane 40.00 104 55 166 205.0 0 39.40 5.3641.570 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 35 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MSD
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350429
MSDSampType: TestCode: 8260SOIL503
1,1-Dichloroethane 40.00 83.0 46 163 205.0 0 32.83 1.1233.200 1,1-Dichloroethene 40.00 81.6 49 157 205.0 0 32.73 0.27532.640 1,1-Dichloropropene 40.00 89.0 59 155 205.0 0 36.70 3.0135.610 1,2,3-Trichlorobenzene 40.00 107 38 154 205.0 0 45.75 6.4142.910 1,2,3-Trichloropropane 40.00 101 49 174 205.0 0 41.29 1.9340.500 1,2,4-Trichlorobenzene 40.00 103 38 146 205.0 0 43.54 5.4741.220 1,2,4-Trimethylbenzene 40.00 83.1 41 157 205.0 0 35.09 5.3833.250 1,2-Dibromo-3-chloropropane 40.00 109 48 185 2010 0 44.56 2.2943.550 1,2-Dibromoethane 40.00 110 54 169 205.0 0 43.07 1.8943.890 1,2-Dichlorobenzene 40.00 98.2 59 136 205.0 0 40.21 2.2939.300 1,2-Dichloroethane 40.00 102 54 164 205.0 0 39.86 2.7240.960 1,2-Dichloropropane 40.00 93.1 60 142 205.0 0 35.81 3.8937.230 1,3,5-Trimethylbenzene 40.00 79.4 44 151 205.0 0 33.71 6.0231.740 1,3-Dichlorobenzene 40.00 94.6 57 133 205.0 0 39.34 3.9437.820 1,3-Dichloropropane 40.00 99.4 63 152 205.0 0 41.00 3.1039.750 1,4-Dichlorobenzene 40.00 92.5 57 133 205.0 0 37.99 2.6736.990 2,2-Dichloropropane 40.00 81.2 50 156 205.0 0 33.00 1.5332.500 2-Butanone 400.0 122 37 192 2050 0 454.6 7.41489.570
2-Chlorotoluene 40.00 90.0 52 140 205.0 0 37.86 5.0436.000 4-Chlorotoluene 40.00 95.1 57 135 205.0 0 39.40 3.5138.040 4-Isopropyltoluene 40.00 74.5 46 152 205.0 0 32.45 8.5129.800 Benzene 40.00 91.2 59 147 205.0 0 36.13 0.90936.460
Bromobenzene 40.00 95.9 66 131 205.0 0 39.53 3.0638.340 Bromodichloromethane 40.00 96.0 54 152 205.0 0 37.54 2.2938.410 Bromoform 40.00 110 50 176 205.0 0 43.36 1.2443.900
Bromomethane 40.00 96.5 40 178 205.0 0 35.79 7.5338.590 Carbon tetrachloride 40.00 86.4 55 159 205.0 0 35.45 2.5134.570 Chlorobenzene 40.00 91.4 62 137 205.0 0 37.39 2.2436.560 Chloroethane 40.00 74.9 41 173 205.0 0 31.82 6.0229.960 Chloroform 40.00 89.8 50 157 205.0 0 34.72 3.3735.910
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 36 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MSD
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350429
MSDSampType: TestCode: 8260SOIL503
Chloromethane 40.00 73.2 41 165 205.0 0 29.31 0.068329.290 cis-1,2-Dichloroethene 40.00 92.2 48 158 205.0 0 36.14 1.9736.860 cis-1,3-Dichloropropene 40.00 100 59 146 205.0 0 37.89 5.4240.000 Di-isopropyl ether 40.00 92.0 44 165 205.0 0 34.97 5.1036.800 Dibromochloromethane 40.00 100 62 151 205.0 0 40.31 0.64740.050 Dibromomethane 40.00 102 52 170 205.0 0 39.36 3.8140.890 Dichlorodifluoromethane 40.00 63.6 36 175 205.0 0 26.42 3.8625.420 Ethyl Tert-butyl ether 40.00 114 52 161 205.0 0 42.48 6.7345.440 Ethylbenzene 40.00 88.4 55 141 205.0 0 37.55 6.0135.360 Freon-113 40.00 77.0 44 161 205.0 0 31.88 3.4830.790
Hexachlorobutadiene 40.00 84.5 34 142 205.0 0 37.35 10.033.790 Isopropylbenzene 40.00 74.5 54 143 205.0 0 32.44 8.5229.790 m,p-Xylene 80.00 88.4 51 150 2010 0 74.66 5.4570.700
Methylene chloride 40.00 89.1 49 159 205.0 0 33.94 4.8935.640 MTBE 40.00 106 43 179 205.0 0 39.09 7.7542.240
n-Butylbenzene 40.00 72.2 42 152 205.0 0 32.02 10.328.870 n-Propylbenzene 40.00 80.9 54 140 205.0 0 35.08 8.1332.340 Naphthalene 40.00 96.2 37 172 205.0 0 40.40 4.9238.460
o-Xylene 40.00 87.1 49 146 205.0 0 36.39 4.3834.830
sec-Butylbenzene 40.00 73.7 51 145 205.0 0 32.28 9.0729.480 Styrene 40.00 88.8 57 145 205.0 0 36.26 2.0635.520
Tert-amyl methyl ether 40.00 119 58 156 205.0 0 43.67 8.9947.780 Tert-Butanol 200.0 108 40 189 2025 0 201.2 7.41216.710
tert-Butylbenzene 40.00 76.0 55 140 205.0 0 32.69 7.2930.390 Tetrachloroethene 40.00 84.6 59 142 205.0 0 37.08 9.1733.830 Toluene 40.00 93.1 54 148 205.0 0 36.85 1.0337.230
trans-1,2-Dichloroethene 40.00 81.8 46 157 205.0 0 33.36 1.9132.730 Trichloroethene 40.00 94.3 52 161 205.0 0 36.29 3.8937.730 Trichlorofluoromethane 40.00 73.8 43 181 205.0 0 31.61 6.8029.530 Vinyl chloride 40.00 71.0 52 160 205.0 0 29.46 3.6328.410 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 37 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: N047080-001A-MSD
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: ZZZZZZ
RunNo: 156639
SeqNo: 4350429
MSDSampType: TestCode: 8260SOIL503
Surr: 1,2-Dichloroethane-d4 50.00 102 64 165 051.170
Surr: 4-Bromofluorobenzene 50.00 99.3 69 124 049.640
Surr: Dibromofluoromethane 50.00 99.3 72 142 049.640
Surr: Toluene-d8 50.00 94.0 75 124 047.020
Sample ID: R210914-MB2
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156639
SeqNo: 4350430
MBLKSampType: TestCode: 8260SOIL503
1,1,1,2-Tetrachloroethane 5.0ND
1,1,1-Trichloroethane 5.0ND
1,1,2,2-Tetrachloroethane 5.0ND
1,1,2-Trichloroethane 5.0ND
1,1-Dichloroethane 5.0ND
1,1-Dichloroethene 5.0ND
1,1-Dichloropropene 5.0ND
1,2,3-Trichlorobenzene 5.0ND
1,2,3-Trichloropropane 5.0ND
1,2,4-Trichlorobenzene 5.0ND
1,2,4-Trimethylbenzene 5.0ND
1,2-Dibromo-3-chloropropane 10ND
1,2-Dibromoethane 5.0ND
1,2-Dichlorobenzene 5.0ND
1,2-Dichloroethane 5.0ND
1,2-Dichloropropane 5.0ND
1,3,5-Trimethylbenzene 5.0ND
1,3-Dichlorobenzene 5.0ND
1,3-Dichloropropane 5.0ND
1,4-Dichlorobenzene 5.0ND
2,2-Dichloropropane 5.0ND
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 38 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-MB2
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156639
SeqNo: 4350430
MBLKSampType: TestCode: 8260SOIL503
2-Butanone 50ND
2-Chlorotoluene 5.0ND
4-Chlorotoluene 5.0ND
4-Isopropyltoluene 5.0ND
Benzene 5.0ND
Bromobenzene 5.0ND
Bromodichloromethane 5.0ND
Bromoform 5.0ND
Bromomethane 5.0ND
Carbon tetrachloride 5.0ND
Chlorobenzene 5.0ND
Chloroethane 5.0ND
Chloroform 5.0ND
Chloromethane 5.0ND
cis-1,2-Dichloroethene 5.0ND
cis-1,3-Dichloropropene 5.0ND
Di-isopropyl ether 5.0ND
Dibromochloromethane 5.0ND
Dibromomethane 5.0ND
Dichlorodifluoromethane 5.0ND
Ethyl Tert-butyl ether 5.0ND
Ethylbenzene 5.0ND
Freon-113 5.0ND
Hexachlorobutadiene 5.0ND
Isopropylbenzene 5.0ND
m,p-Xylene 10ND
Methylene chloride 5.0ND
MTBE 5.0ND
n-Butylbenzene 5.0ND
n-Propylbenzene 5.0ND
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 39 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260SOIL5035
Sample ID: R210914-MB2
Batch ID: R21VS051 TestNo: EPA 8260B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/Kg
PQL
Client ID: PBS
RunNo: 156639
SeqNo: 4350430
MBLKSampType: TestCode: 8260SOIL503
Naphthalene 5.0ND
o-Xylene 5.0ND
sec-Butylbenzene 5.0ND
Styrene 5.0ND
Tert-amyl methyl ether 5.0ND
Tert-Butanol 25ND
tert-Butylbenzene 5.0ND
Tetrachloroethene 5.0ND
Toluene 5.0ND
trans-1,2-Dichloroethene 5.0ND
Trichloroethene 5.0ND
Trichlorofluoromethane 5.0ND
Vinyl chloride 5.0ND
Surr: 1,2-Dichloroethane-d4 50.00 103 64 16551.660
Surr: 4-Bromofluorobenzene 50.00 91.4 69 12445.680
Surr: Dibromofluoromethane 50.00 105 72 14252.310
Surr: Toluene-d8 50.00 96.5 75 12448.270
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 40 of 41

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047070 ANALYTICAL QC SUMMARY REPORT
TestCode: HC_S_SEMI
Sample ID: MB-89263
Batch ID: 89263 TestNo: EPA 8015B(M Analysis Date: 9/13/2021 Prep Date: 9/13/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/Kg
PQL
Client ID: PBS
RunNo: 156628
SeqNo: 4349842
MBLKSampType: TestCode: HC_S_SEMI
EPA 3550B
T/R Hydrocarbons: C13-C22 10ND
T/R Hydrocarbons: C23-C40 10ND
Surr: p-Terphenyl 80.00 122 56 13397.232
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 41 of 41
N047070-01
-02
-03
-04
-05
-06
-07
-08
-09
-10
N047070-11
-12
ASSET Laboratories
Please review the checklist below. Any NO signifies non-compliance. Any non-compliance will be noted and must be understood as having an impact on the quality of the data. All tests will be performed as requested regardless of any compliance issues.

If you have any questions or further instruction, please contact our Project Coordinator at (702) 307-2659.

Carrier name: ASSET
Cooler Received/Opened On: 9/10/2021
Rep sample Temp (Deg C): 4.0 IR Gun ID: 1
Temp Blank: Yes No
Last 4 digits of Tracking No.: NA
Cooling process: Ice Ice Pack Dry Ice Other None
Packing Material Used: None
Workorder: N047070
Sample Receipt Checklist

4. Chain of custody present? Yes No

6. Chain of custody signed when relinquished and received? Yes No

7. Chain of custody agrees with sample labels? Yes No

8. Samples in proper container/bottle? Yes No

9. Sample containers intact? Yes No

10. Sufficient sample volume for indicated test? Yes No

11. All samples received within holding time? Yes No
Yes No NA13. Water - VOA vials have zero headspace?

14. Water - pH acceptable upon receipt?
Yes No NA
Example: pH > 12 for (CN,S); pH<2 for Metals

1. Shipping container/cooler in good condition? Yes No Not Present

2. Custody seals intact, signed, dated on shippping container/cooler? Yes No Not Present

3. Custody seals intact on sample bottles? Yes No Not Present

5. Sampler's name present in COC? Yes No

12. Temperature of rep sample or Temp Blank within acceptable limit? Yes No NA Yes No NA15. Did the bottle labels indicate correct preservatives used?

16. Were there Non-Conformance issues at login?
Yes No NA
Was Client notified? Yes No NA
Comments: Received at Las Vegas Lab on 9/11/21 at 3.1oC, IR#1, GSO #2889.

Checklist Completed By: AD Reviewed By:
9/13/2021
1 AssetLabs Sample Control
From: Lindsey Dandridge-Perry <[email protected]> Sent: Saturday, September 11, 2021 10:17 AM
To: Ashley Marie DaSilva
Cc: [email protected]; AssetLabs Sample Control; 'Yoandra Rodriguez'; Mary Ann; Rustico Aquino
Subject: RE: [ASSET#N047070] Costco Culver City
Thanks Ashley, the sample date should also be 9/10/21.

-----Original Message-----
From: Ashley Marie DaSilva <[email protected]> Sent: Friday, September 10, 2021 6:29 PM
To: Lindsey Dandridge-Perry <[email protected]> Cc: [email protected]; AssetLabs Sample Control <[email protected]>; 'Yoandra Rodriguez' <[email protected]>; Mary Ann <[email protected]>; Rustico Aquino <[email protected]>
Subject: [ASSET#N047070] Costco Culver City

External Email
________________________________

Hi Lindsey!

For the above project, please note the relinquished date should be 9/10/21 instead of 9/9/21.

Please also confirm the sample collection date and TAT required for this project.

Attached are the COCs for reference.

Thank you!
Ashley DaSilva

--
ASSET Laboratories
11110 Artesia Blvd., Suite B.

Cerritos, CA 90703

W: 562-219-7435

--
This email has been checked for viruses by Avast antivirus software. https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.avast.com%2Fantivirus&amp;data=04%7C 01%7CLDandridge%40kleinfelder.com%7C114be480f41e46b5803808d974c3863b%7Cf47e3906f3d244ab9f1b76742a939 45b%7C0%7C0%7C637669205525607986%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 13-Sep-21
WorkOrder: N047070
Comments:

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/10/2021
Test Name
ASSET Laboratories
Storage
N047070-001A KB-3-2.5 9/9/2021 8:04:00 AM Soil VS
N047070-002A KB-3-5 9/9/2021 8:18:00 AM 9/17/2021 EPA 3050B SOPREP TOTAL METALS WS 9/17/2021 EPA 6010B TOTAL METALS BY ICP WS
9/17/2021 MERCURY PREP WS
9/17/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/17/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/17/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
N047070-002B 9/17/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/17/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047070-002C 9/17/2021 EPA 5035 Closed System Purge and Trap VS 9/17/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047070-002D VS-CA
N047070-002E VS
N047070-002F VS-CA
N047070-003A KB-3-10 9/9/2021 8:55:00 AM 9/17/2021 EPA 3050B SOPREP TOTAL METALS WS 9/17/2021 EPA 6010B TOTAL METALS BY ICP WS
9/17/2021 MERCURY PREP WS
9/17/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/17/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/17/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
1 of 5Page
Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 13-Sep-21
WorkOrder: N047070
Comments:

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/10/2021
Test Name
ASSET Laboratories
Storage
N047070-003B KB-3-10 9/9/2021 8:55:00 AM 9/17/2021 Soil EPA 5035 Closed System Purge and Trap VS-CA 9/17/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047070-003C 9/17/2021 EPA 5035 Closed System Purge and Trap VS 9/17/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047070-003D VS-CA
N047070-003E VS
N047070-003F VS-CA
N047070-004A KB-3-15 9/9/2021 9:01:00 AM VS
N047070-005A KB-3-20 9/9/2021 9:20:00 AM 9/17/2021 EPA 3050B SOPREP TOTAL METALS WS 9/17/2021 EPA 6010B TOTAL METALS BY ICP WS
9/17/2021 MERCURY PREP WS
9/17/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/17/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/17/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
N047070-005B 9/17/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/17/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047070-005C 9/17/2021 EPA 5035 Closed System Purge and Trap VS 9/17/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047070-005D VS-CA
N047070-005E VS
2 of 5Page
Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 13-Sep-21
WorkOrder: N047070
Comments:

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/10/2021
Test Name
ASSET Laboratories
Storage
N047070-005F KB-3-20 9/9/2021 9:20:00 AM Soil VS-CA
N047070-006A KB-3-25 9/9/2021 9:33:00 AM VS
N047070-007A KB-4-2.5 9/9/2021 12:57:00 PM 9/17/2021 EPA 3050B SOPREP TOTAL METALS WS 9/17/2021 EPA 6010B TOTAL METALS BY ICP WS
9/17/2021 MERCURY PREP WS
9/17/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/17/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/17/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
N047070-007B 9/17/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/17/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047070-007C 9/17/2021 EPA 5035 Closed System Purge and Trap VS 9/17/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047070-007D VS-CA
N047070-007E VS
N047070-007F VS-CA
N047070-008A KB-4-5 9/9/2021 1:03:00 PM 9/17/2021 EPA 3050B SOPREP TOTAL METALS WS 9/17/2021 EPA 6010B TOTAL METALS BY ICP WS
9/17/2021 MERCURY PREP WS
9/17/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/17/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
3 of 5Page
Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 13-Sep-21
WorkOrder: N047070
Comments:

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/10/2021
Test Name
ASSET Laboratories
Storage
N047070-008A KB-4-5 9/9/2021 1:03:00 PM 9/17/2021 Soil EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE FUELS
WS
N047070-008B 9/17/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/17/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047070-008C 9/17/2021 EPA 5035 Closed System Purge and Trap VS 9/17/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047070-008D VS-CA
N047070-008E VS
N047070-008F VS-CA
N047070-009A KB-4-10 9/9/2021 1:29:00 PM 9/17/2021 EPA 3050B SOPREP TOTAL METALS WS 9/17/2021 EPA 6010B TOTAL METALS BY ICP WS
9/17/2021 MERCURY PREP WS
9/17/2021 EPA 7471A TOTAL MERCURY BY COLD VAPOR

TECHNIQUE
WS
9/17/2021 EPA 8015B(M) HYDROCARBON CHAIN

IDENTIFICATION
WS
9/17/2021 EPA 3550B SHAKE-OUT METHOD: EXTRACTABLE
FUELS
WS
N047070-009B 9/17/2021 EPA 5035 Closed System Purge and Trap VS-CA 9/17/2021 EPA 8260B VOLATILE ORGANIC COMPOUNDS BY
GC/MS
VS-CA
N047070-009C 9/17/2021 EPA 5035 Closed System Purge and Trap VS 9/17/2021 EPA 8015B GASOLINE RANGE ORGANICS BY
GC/FID
VS
N047070-009D VS-CA
N047070-009E VS
4 of 5Page
Sample ID Client Sample ID Date Collected
Date Received:

Date Due Matrix Test No
WORK ORDER Summary 13-Sep-21
WorkOrder: N047070
Comments:

Client ID: KLEFE02
Project: Costco Culver City, 20201678.001A QC Level: RTNE Hld MS Sub
9/10/2021
Test Name
ASSET Laboratories
Storage
N047070-009F KB-4-10 9/9/2021 1:29:00 PM Soil VS-CA
N047070-010A KB-4-15 9/9/2021 1:55:00 PM VS
N047070-011A KB-4-20 9/9/2021 1:38:00 PM VS
N047070-012A KB-4-25 9/9/2021 1:44:00 PM VS
N047070-013A FOLDER 9/17/2021 9/17/2021 Folder Folder LAB 9/17/2021 Folder Folder LAB
5 of 5Page

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

September 20, 2021
Kleinfelder
Lindsey Dandridge-Perry
Attention: Lindsey Dandridge-Perry
RE: Costco Culver City, 20201678.001A
Workorder No.:N047085FAX:

TEL: (949) 585-3133
24411 Ridge Route Dr. #225
Laguna Hills, CA 92653
Thank you for the opportunity to service the needs of your company.

Please feel free to call me at (562) 219-7435 if I can be of further assistance to your company.

Sincerely,
Andrew Garaniel
Laboratory Director
Enclosed are the results for sample(s) received on September 13, 2021 by ASSET Laboratories.

The sample(s) are tested for the parameters as indicated in the enclosed chain of custody in accordance with the applicable laboratory certifications.

The cover letter is an integral part of this analytical report. This Laboratory Report cannot be reproduced in part or in its entirety without written permission from the client and ASSET Laboratories - California. 1 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

20-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Lab Order: N047085

CASE NARRATIVE
SAMPLE RECEIVING/GENERAL COMMENTS:

All sample containers were received intact with proper chain of custody documentation.

Information on sample receipt conditions including discrepancies can be found in attached Sample Receipt Checklist Form.

Cooler temperature and sample preservation were verified upon receipt of samples if applicable.

Samples were analyzed within method holding time.

Results were J-Flag. "J" is used to flag those results that are between the PQL (Practical Quantitation Limit) and the calculated MDL (Method Detection Limit). Results that are "J" Flagged are estimated values since it becomes difficult to accurately quantitate the analyte near the MDL.

Analytical comments for EPA 6010B:

Laboratory Control Sample (LCS) recovery biased high on analyte Silver. Sample results were non- detect (ND) for these analytes therefore reanalysis of the samples was not necessary.

Matrix Spike (MS) and Matrix Spike Duplicate (MSD) are outside recovery criteria on some analytes possibly due to matrix interference. The associated Laboratory Control Sample (LCS) recovery was acceptable.
2 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

20-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Lab Order: N047085
Work Order Sample Summary
Lab Sample ID Client Sample ID Collection DateMatrix Date Received Contract No:

Date Reported
N047085-001AKB-1 9/10/2021 5:55:00 PM 9/13/2021 9/20/2021Groundwater N047085-001BKB-1 9/10/2021 5:55:00 PM 9/13/2021 9/20/2021Groundwater N047085-001CKB-1 9/10/2021 5:55:00 PM 9/13/2021 9/20/2021Groundwater N047085-001DKB-1 9/10/2021 5:55:00 PM 9/13/2021 9/20/2021Groundwater N047085-001EKB-1 9/10/2021 5:55:00 PM 9/13/2021 9/20/2021Groundwater N047085-002AKB-2 9/10/2021 6:38:00 PM 9/13/2021 9/20/2021Groundwater N047085-002BKB-2 9/10/2021 6:38:00 PM 9/13/2021 9/20/2021Groundwater N047085-002CKB-2 9/10/2021 6:38:00 PM 9/13/2021 9/20/2021Groundwater N047085-002DKB-2 9/10/2021 6:38:00 PM 9/13/2021 9/20/2021Groundwater N047085-002EKB-2 9/10/2021 6:38:00 PM 9/13/2021 9/20/2021Groundwater N047085-003AKB-3 9/10/2021 8:15:00 PM 9/13/2021 9/20/2021Groundwater N047085-003BKB-3 9/10/2021 8:15:00 PM 9/13/2021 9/20/2021Groundwater N047085-003CKB-3 9/10/2021 8:15:00 PM 9/13/2021 9/20/2021Groundwater N047085-003DKB-3 9/10/2021 8:15:00 PM 9/13/2021 9/20/2021Groundwater N047085-003EKB-3 9/10/2021 8:15:00 PM 9/13/2021 9/20/2021Groundwater N047085-004AKB-4 9/10/2021 7:58:00 PM 9/13/2021 9/20/2021Groundwater N047085-004BKB-4 9/10/2021 7:58:00 PM 9/13/2021 9/20/2021Groundwater N047085-004CKB-4 9/10/2021 7:58:00 PM 9/13/2021 9/20/2021Groundwater N047085-004DKB-4 9/10/2021 7:58:00 PM 9/13/2021 9/20/2021Groundwater N047085-004EKB-4 9/10/2021 7:58:00 PM 9/13/2021 9/20/2021Groundwater N047085-005AB-1 9/13/2021 12:31:00 PM 9/13/2021 9/20/2021Groundwater N047085-005BB-1 9/13/2021 12:31:00 PM 9/13/2021 9/20/2021Groundwater N047085-005CB-1 9/13/2021 12:31:00 PM 9/13/2021 9/20/2021Groundwater N047085-005DB-1 9/13/2021 12:31:00 PM 9/13/2021 9/20/2021Groundwater N047085-005EB-1 9/13/2021 12:31:00 PM 9/13/2021 9/20/2021Groundwater 3 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1
Collection Date: 9/10/2021 5:55:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-001
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
1,1,1,2-Tetrachloroethane 0.50 µg/L 1ND 0.25 9/15/2021 04:07 PM 1,1,1-Trichloroethane 0.50 µg/L 1ND 0.20 9/15/2021 04:07 PM 1,1,2,2-Tetrachloroethane 0.50 µg/L 1ND 0.11 9/15/2021 04:07 PM 1,1,2-Trichloroethane 0.50 µg/L 1ND 0.23 9/15/2021 04:07 PM 1,1-Dichloroethane 0.50 µg/L 1ND 0.22 9/15/2021 04:07 PM 1,1-Dichloroethene 0.50 µg/L 1ND 0.17 9/15/2021 04:07 PM 1,1-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 04:07 PM 1,2,3-Trichlorobenzene 0.50 µg/L 1ND 0.37 9/15/2021 04:07 PM 1,2,3-Trichloropropane 0.50 µg/L 1ND 0.23 9/15/2021 04:07 PM 1,2,4-Trichlorobenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:07 PM 1,2,4-Trimethylbenzene 0.50 µg/L 1ND 0.060 9/15/2021 04:07 PM 1,2-Dibromo-3-chloropropane 1.0 µg/L 1ND 0.32 9/15/2021 04:07 PM 1,2-Dibromoethane 0.50 µg/L 1ND 0.19 9/15/2021 04:07 PM 1,2-Dichlorobenzene 0.50 µg/L 1ND 0.089 9/15/2021 04:07 PM 1,2-Dichloroethane 0.50 µg/L 1ND 0.16 9/15/2021 04:07 PM 1,2-Dichloropropane 0.50 µg/L 1ND 0.16 9/15/2021 04:07 PM 1,3,5-Trimethylbenzene 0.50 µg/L 1ND 0.051 9/15/2021 04:07 PM 1,3-Dichlorobenzene 0.50 µg/L 1ND 0.081 9/15/2021 04:07 PM 1,3-Dichloropropane 0.50 µg/L 1ND 0.13 9/15/2021 04:07 PM 1,4-Dichlorobenzene 0.50 µg/L 1ND 0.080 9/15/2021 04:07 PM 2,2-Dichloropropane 0.50 µg/L 1ND 0.22 9/15/2021 04:07 PM 2-Butanone 5.0 µg/L 1ND 4.7 9/15/2021 04:07 PM
2-Chlorotoluene 0.50 µg/L 1ND 0.090 9/15/2021 04:07 PM
4-Chlorotoluene 0.50 µg/L 1ND 0.065 9/15/2021 04:07 PM
4-Isopropyltoluene 0.50 µg/L 1ND 0.085 9/15/2021 04:07 PM Benzene 0.50 µg/L 1ND 0.11 9/15/2021 04:07 PM
Bromobenzene 0.50 µg/L 1ND 0.093 9/15/2021 04:07 PM
Bromodichloromethane 0.50 µg/L 1ND 0.20 9/15/2021 04:07 PM Bromoform 0.50 µg/L 1ND 0.23 9/15/2021 04:07 PM
Bromomethane 1.0 µg/L 1ND 0.38 9/15/2021 04:07 PM
Carbon tetrachloride 0.50 µg/L 1ND 0.33 9/15/2021 04:07 PM Chlorobenzene 0.50 µg/L 1ND 0.11 9/15/2021 04:07 PM
Chloroethane 1.0 µg/L 1ND 0.69 9/15/2021 04:07 PM
Chloroform 0.50 µg/L 1ND 0.38 9/15/2021 04:07 PM
Chloromethane J0.50 µg/L 10.30 0.23 9/15/2021 04:07 PM
cis-1,2-Dichloroethene 0.50 µg/L 1ND 0.11 9/15/2021 04:07 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 4 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1
Collection Date: 9/10/2021 5:55:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-001
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
cis-1,3-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 04:07 PM Di-isopropyl ether 0.50 µg/L 1ND 0.15 9/15/2021 04:07 PM Dibromochloromethane 0.50 µg/L 1ND 0.23 9/15/2021 04:07 PM Dibromomethane 0.50 µg/L 1ND 0.13 9/15/2021 04:07 PM
Dichlorodifluoromethane 0.50 µg/L 1ND 0.16 9/15/2021 04:07 PM Ethyl tert-butyl ether 0.50 µg/L 1ND 0.10 9/15/2021 04:07 PM Ethylbenzene 0.50 µg/L 1ND 0.11 9/15/2021 04:07 PM
Freon-113 0.50 µg/L 1ND 0.28 9/15/2021 04:07 PM
Hexachlorobutadiene 0.50 µg/L 1ND 0.30 9/15/2021 04:07 PM Isopropylbenzene 0.50 µg/L 1ND 0.092 9/15/2021 04:07 PM m,p-Xylene 1.0 µg/L 1ND 0.23 9/15/2021 04:07 PM
Methylene chloride 2.0 µg/L 1ND 1.2 9/15/2021 04:07 PM
MTBE 0.50 µg/L 1ND 0.44 9/15/2021 04:07 PM
n-Butylbenzene 0.50 µg/L 1ND 0.093 9/15/2021 04:07 PM
n-Propylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:07 PM
Naphthalene 0.50 µg/L 1ND 0.41 9/15/2021 04:07 PM
o-Xylene 0.50 µg/L 1ND 0.087 9/15/2021 04:07 PM
sec-Butylbenzene 0.50 µg/L 1ND 0.076 9/15/2021 04:07 PM Styrene 0.50 µg/L 1ND 0.41 9/15/2021 04:07 PM
Tert-amyl methyl ether 0.50 µg/L 1ND 0.13 9/15/2021 04:07 PM Tert-Butanol 5.0 µg/L 1ND 2.8 9/15/2021 04:07 PM
tert-Butylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:07 PM Tetrachloroethene 0.50 µg/L 12.4 0.25 9/15/2021 04:07 PM Toluene 0.50 µg/L 1ND 0.13 9/15/2021 04:07 PM
trans-1,2-Dichloroethene 0.50 µg/L 1ND 0.27 9/15/2021 04:07 PM Trichloroethene 0.50 µg/L 1ND 0.26 9/15/2021 04:07 PM
Trichlorofluoromethane 0.50 µg/L 1ND 0.23 9/15/2021 04:07 PM Vinyl chloride 0.50 µg/L 1ND 0.19 9/15/2021 04:07 PM
Surr: 1,2-Dichloroethane-d4 72-132 %REC 1112 0 9/15/2021 04:07 PM Surr: 4-Bromofluorobenzene 80-120 %REC 190.1 0 9/15/2021 04:07 PM Surr: Dibromofluoromethane 78-130 %REC 1113 0 9/15/2021 04:07 PM Surr: Toluene-d8 80-120 %REC 198.6 0 9/15/2021 04:07 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 5 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-1
Collection Date: 9/10/2021 5:55:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-001
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 T/R Hydrocarbons: C13-C22 0.20 mg/L 1ND 0.20 9/14/2021 10:07 PM T/R Hydrocarbons: C23-C40 0.20 mg/L 1ND 0.20 9/14/2021 10:07 PM Surr: p-Terphenyl 54-139 %REC 190.6 0 9/14/2021 10:07 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC4_210915A E21VW089QC Batch: PrepDate:

GRO (C6 - C12) J0.050 mg/L 10.022 0.019 9/15/2021 12:43 PM Surr: Chlorobenzene - d5 66-123 %REC 184.3 0 9/15/2021 12:43 PM

DISSOLVED MERCURY BY COLD VAPOR TECHNIQUE
EPA 7470A
Analyst: DJRunID: NV00922-AA2_210915B 89300QC Batch: PrepDate: 9/15/2021 Mercury 0.20 µg/L 1ND 0.12 9/15/2021 04:09 PM

DISSOLVED METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3010A
RunID: NV00922-ICP2_210916A 89308QC Batch: PrepDate: 9/15/2021 Antimony 0.010 mg/L 1ND 0.0045 9/16/2021 11:34 AM
Arsenic 0.010 mg/L 1ND 0.0077 9/16/2021 11:34 AM
Barium 0.0030 mg/L 10.044 0.0010 9/16/2021 11:34 AM
Beryllium 0.0030 mg/L 1ND 0.00031 9/16/2021 11:34 AM
Cadmium 0.0030 mg/L 1ND 0.00085 9/16/2021 11:34 AM
Chromium 0.0030 mg/L 10.0036 0.00054 9/16/2021 07:48 PM Cobalt 0.0030 mg/L 1ND 0.0019 9/16/2021 11:34 AM
Copper 0.0050 mg/L 10.0086 0.0011 9/16/2021 11:34 AM
Lead 0.010 mg/L 1ND 0.0040 9/16/2021 11:34 AM
Molybdenum 0.0050 mg/L 10.023 0.0026 9/16/2021 11:34 AM Nickel 0.0050 mg/L 1ND 0.0020 9/16/2021 11:34 AM
Selenium 0.010 mg/L 1ND 0.0085 9/16/2021 11:34 AM
Silver 0.0030 mg/L 1ND 0.0024 9/16/2021 11:34 AM
Thallium 0.015 mg/L 10.029 0.0060 9/16/2021 07:48 PM
Vanadium 0.0030 mg/L 10.0033 0.0012 9/16/2021 07:48 PM
Zinc 0.010 mg/L 1ND 0.0077 9/16/2021 11:34 AM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 6 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2
Collection Date: 9/10/2021 6:38:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-002
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
1,1,1,2-Tetrachloroethane 0.50 µg/L 1ND 0.25 9/15/2021 04:31 PM 1,1,1-Trichloroethane 0.50 µg/L 1ND 0.20 9/15/2021 04:31 PM 1,1,2,2-Tetrachloroethane 0.50 µg/L 1ND 0.11 9/15/2021 04:31 PM 1,1,2-Trichloroethane 0.50 µg/L 1ND 0.23 9/15/2021 04:31 PM 1,1-Dichloroethane 0.50 µg/L 1ND 0.22 9/15/2021 04:31 PM 1,1-Dichloroethene 0.50 µg/L 1ND 0.17 9/15/2021 04:31 PM 1,1-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 04:31 PM 1,2,3-Trichlorobenzene 0.50 µg/L 1ND 0.37 9/15/2021 04:31 PM 1,2,3-Trichloropropane 0.50 µg/L 1ND 0.23 9/15/2021 04:31 PM 1,2,4-Trichlorobenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:31 PM 1,2,4-Trimethylbenzene 0.50 µg/L 1ND 0.060 9/15/2021 04:31 PM 1,2-Dibromo-3-chloropropane 1.0 µg/L 1ND 0.32 9/15/2021 04:31 PM 1,2-Dibromoethane 0.50 µg/L 1ND 0.19 9/15/2021 04:31 PM 1,2-Dichlorobenzene 0.50 µg/L 1ND 0.089 9/15/2021 04:31 PM 1,2-Dichloroethane 0.50 µg/L 1ND 0.16 9/15/2021 04:31 PM 1,2-Dichloropropane 0.50 µg/L 1ND 0.16 9/15/2021 04:31 PM 1,3,5-Trimethylbenzene 0.50 µg/L 1ND 0.051 9/15/2021 04:31 PM 1,3-Dichlorobenzene 0.50 µg/L 1ND 0.081 9/15/2021 04:31 PM 1,3-Dichloropropane 0.50 µg/L 1ND 0.13 9/15/2021 04:31 PM 1,4-Dichlorobenzene 0.50 µg/L 1ND 0.080 9/15/2021 04:31 PM 2,2-Dichloropropane 0.50 µg/L 1ND 0.22 9/15/2021 04:31 PM 2-Butanone 5.0 µg/L 1ND 4.7 9/15/2021 04:31 PM
2-Chlorotoluene 0.50 µg/L 1ND 0.090 9/15/2021 04:31 PM
4-Chlorotoluene 0.50 µg/L 1ND 0.065 9/15/2021 04:31 PM
4-Isopropyltoluene 0.50 µg/L 1ND 0.085 9/15/2021 04:31 PM Benzene 0.50 µg/L 1ND 0.11 9/15/2021 04:31 PM
Bromobenzene 0.50 µg/L 1ND 0.093 9/15/2021 04:31 PM
Bromodichloromethane 0.50 µg/L 1ND 0.20 9/15/2021 04:31 PM Bromoform 0.50 µg/L 1ND 0.23 9/15/2021 04:31 PM
Bromomethane 1.0 µg/L 1ND 0.38 9/15/2021 04:31 PM
Carbon tetrachloride 0.50 µg/L 1ND 0.33 9/15/2021 04:31 PM Chlorobenzene 0.50 µg/L 1ND 0.11 9/15/2021 04:31 PM
Chloroethane 1.0 µg/L 1ND 0.69 9/15/2021 04:31 PM
Chloroform 0.50 µg/L 1ND 0.38 9/15/2021 04:31 PM
Chloromethane J0.50 µg/L 10.32 0.23 9/15/2021 04:31 PM
cis-1,2-Dichloroethene 0.50 µg/L 1ND 0.11 9/15/2021 04:31 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 7 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2
Collection Date: 9/10/2021 6:38:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-002
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
cis-1,3-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 04:31 PM Di-isopropyl ether 0.50 µg/L 1ND 0.15 9/15/2021 04:31 PM Dibromochloromethane 0.50 µg/L 1ND 0.23 9/15/2021 04:31 PM Dibromomethane 0.50 µg/L 1ND 0.13 9/15/2021 04:31 PM
Dichlorodifluoromethane 0.50 µg/L 1ND 0.16 9/15/2021 04:31 PM Ethyl tert-butyl ether 0.50 µg/L 1ND 0.10 9/15/2021 04:31 PM Ethylbenzene 0.50 µg/L 1ND 0.11 9/15/2021 04:31 PM
Freon-113 0.50 µg/L 1ND 0.28 9/15/2021 04:31 PM
Hexachlorobutadiene 0.50 µg/L 1ND 0.30 9/15/2021 04:31 PM Isopropylbenzene 0.50 µg/L 1ND 0.092 9/15/2021 04:31 PM m,p-Xylene 1.0 µg/L 1ND 0.23 9/15/2021 04:31 PM
Methylene chloride 2.0 µg/L 1ND 1.2 9/15/2021 04:31 PM
MTBE 0.50 µg/L 1ND 0.44 9/15/2021 04:31 PM
n-Butylbenzene 0.50 µg/L 1ND 0.093 9/15/2021 04:31 PM
n-Propylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:31 PM
Naphthalene 0.50 µg/L 1ND 0.41 9/15/2021 04:31 PM
o-Xylene 0.50 µg/L 1ND 0.087 9/15/2021 04:31 PM
sec-Butylbenzene 0.50 µg/L 1ND 0.076 9/15/2021 04:31 PM Styrene 0.50 µg/L 1ND 0.41 9/15/2021 04:31 PM
Tert-amyl methyl ether 0.50 µg/L 1ND 0.13 9/15/2021 04:31 PM Tert-Butanol 5.0 µg/L 1ND 2.8 9/15/2021 04:31 PM
tert-Butylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:31 PM Tetrachloroethene 0.50 µg/L 10.52 0.25 9/15/2021 04:31 PM Toluene 0.50 µg/L 1ND 0.13 9/15/2021 04:31 PM
trans-1,2-Dichloroethene 0.50 µg/L 1ND 0.27 9/15/2021 04:31 PM Trichloroethene 0.50 µg/L 1ND 0.26 9/15/2021 04:31 PM
Trichlorofluoromethane 0.50 µg/L 1ND 0.23 9/15/2021 04:31 PM Vinyl chloride 0.50 µg/L 1ND 0.19 9/15/2021 04:31 PM
Surr: 1,2-Dichloroethane-d4 72-132 %REC 1120 0 9/15/2021 04:31 PM Surr: 4-Bromofluorobenzene 80-120 %REC 188.0 0 9/15/2021 04:31 PM Surr: Dibromofluoromethane 78-130 %REC 1118 0 9/15/2021 04:31 PM Surr: Toluene-d8 80-120 %REC 195.4 0 9/15/2021 04:31 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 8 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-2
Collection Date: 9/10/2021 6:38:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-002
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 T/R Hydrocarbons: C13-C22 0.20 mg/L 1ND 0.20 9/14/2021 10:36 PM T/R Hydrocarbons: C23-C40 0.20 mg/L 1ND 0.20 9/14/2021 10:36 PM Surr: p-Terphenyl 54-139 %REC 183.2 0 9/14/2021 10:36 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC4_210914A E21VW088QC Batch: PrepDate:

GRO (C6 - C12) J0.050 mg/L 10.029 0.019 9/14/2021 08:21 PM Surr: Chlorobenzene - d5 66-123 %REC 177.2 0 9/14/2021 08:21 PM

DISSOLVED MERCURY BY COLD VAPOR TECHNIQUE
EPA 7470A
Analyst: DJRunID: NV00922-AA2_210915B 89300QC Batch: PrepDate: 9/15/2021 Mercury 0.20 µg/L 1ND 0.12 9/15/2021 04:13 PM

DISSOLVED METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3010A
RunID: NV00922-ICP2_210916A 89308QC Batch: PrepDate: 9/15/2021 Antimony 0.010 mg/L 1ND 0.0045 9/16/2021 12:01 PM
Arsenic 0.010 mg/L 1ND 0.0077 9/16/2021 12:01 PM
Barium 0.0030 mg/L 10.043 0.0010 9/16/2021 12:01 PM
Beryllium 0.0030 mg/L 1ND 0.00031 9/16/2021 12:01 PM
Cadmium 0.0030 mg/L 1ND 0.00085 9/16/2021 12:01 PM
Chromium J0.0030 mg/L 10.0030 0.00054 9/16/2021 08:11 PM Cobalt 0.0030 mg/L 1ND 0.0019 9/16/2021 12:01 PM
Copper 0.0050 mg/L 10.0076 0.0011 9/16/2021 12:01 PM
Lead 0.010 mg/L 1ND 0.0040 9/16/2021 12:01 PM
Molybdenum 0.0050 mg/L 10.016 0.0026 9/16/2021 12:01 PM Nickel 0.0050 mg/L 1ND 0.0020 9/16/2021 12:01 PM
Selenium 0.010 mg/L 1ND 0.0085 9/16/2021 12:01 PM
Silver 0.0030 mg/L 1ND 0.0024 9/16/2021 12:01 PM
Thallium 0.015 mg/L 10.028 0.0060 9/16/2021 08:11 PM
Vanadium 0.0030 mg/L 10.0033 0.0012 9/16/2021 08:11 PM
Zinc 0.010 mg/L 1ND 0.0077 9/16/2021 12:01 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 9 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3
Collection Date: 9/10/2021 8:15:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-003
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
1,1,1,2-Tetrachloroethane 0.50 µg/L 1ND 0.25 9/15/2021 04:55 PM 1,1,1-Trichloroethane 0.50 µg/L 1ND 0.20 9/15/2021 04:55 PM 1,1,2,2-Tetrachloroethane 0.50 µg/L 1ND 0.11 9/15/2021 04:55 PM 1,1,2-Trichloroethane 0.50 µg/L 1ND 0.23 9/15/2021 04:55 PM 1,1-Dichloroethane 0.50 µg/L 1ND 0.22 9/15/2021 04:55 PM 1,1-Dichloroethene 0.50 µg/L 1ND 0.17 9/15/2021 04:55 PM 1,1-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 04:55 PM 1,2,3-Trichlorobenzene 0.50 µg/L 1ND 0.37 9/15/2021 04:55 PM 1,2,3-Trichloropropane 0.50 µg/L 1ND 0.23 9/15/2021 04:55 PM 1,2,4-Trichlorobenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:55 PM 1,2,4-Trimethylbenzene 0.50 µg/L 1ND 0.060 9/15/2021 04:55 PM 1,2-Dibromo-3-chloropropane 1.0 µg/L 1ND 0.32 9/15/2021 04:55 PM 1,2-Dibromoethane 0.50 µg/L 1ND 0.19 9/15/2021 04:55 PM 1,2-Dichlorobenzene 0.50 µg/L 1ND 0.089 9/15/2021 04:55 PM 1,2-Dichloroethane 0.50 µg/L 1ND 0.16 9/15/2021 04:55 PM 1,2-Dichloropropane 0.50 µg/L 1ND 0.16 9/15/2021 04:55 PM 1,3,5-Trimethylbenzene 0.50 µg/L 1ND 0.051 9/15/2021 04:55 PM 1,3-Dichlorobenzene 0.50 µg/L 1ND 0.081 9/15/2021 04:55 PM 1,3-Dichloropropane 0.50 µg/L 1ND 0.13 9/15/2021 04:55 PM 1,4-Dichlorobenzene 0.50 µg/L 1ND 0.080 9/15/2021 04:55 PM 2,2-Dichloropropane 0.50 µg/L 1ND 0.22 9/15/2021 04:55 PM 2-Butanone 5.0 µg/L 1ND 4.7 9/15/2021 04:55 PM
2-Chlorotoluene 0.50 µg/L 1ND 0.090 9/15/2021 04:55 PM
4-Chlorotoluene 0.50 µg/L 1ND 0.065 9/15/2021 04:55 PM
4-Isopropyltoluene 0.50 µg/L 1ND 0.085 9/15/2021 04:55 PM Benzene 0.50 µg/L 1ND 0.11 9/15/2021 04:55 PM
Bromobenzene 0.50 µg/L 1ND 0.093 9/15/2021 04:55 PM
Bromodichloromethane 0.50 µg/L 1ND 0.20 9/15/2021 04:55 PM Bromoform 0.50 µg/L 1ND 0.23 9/15/2021 04:55 PM
Bromomethane 1.0 µg/L 1ND 0.38 9/15/2021 04:55 PM
Carbon tetrachloride 0.50 µg/L 1ND 0.33 9/15/2021 04:55 PM Chlorobenzene 0.50 µg/L 1ND 0.11 9/15/2021 04:55 PM
Chloroethane 1.0 µg/L 1ND 0.69 9/15/2021 04:55 PM
Chloroform 0.50 µg/L 1ND 0.38 9/15/2021 04:55 PM
Chloromethane 0.50 µg/L 1ND 0.23 9/15/2021 04:55 PM
cis-1,2-Dichloroethene 0.50 µg/L 1ND 0.11 9/15/2021 04:55 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 10 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3
Collection Date: 9/10/2021 8:15:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-003
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
cis-1,3-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 04:55 PM Di-isopropyl ether 0.50 µg/L 1ND 0.15 9/15/2021 04:55 PM Dibromochloromethane 0.50 µg/L 1ND 0.23 9/15/2021 04:55 PM Dibromomethane 0.50 µg/L 1ND 0.13 9/15/2021 04:55 PM
Dichlorodifluoromethane 0.50 µg/L 1ND 0.16 9/15/2021 04:55 PM Ethyl tert-butyl ether 0.50 µg/L 1ND 0.10 9/15/2021 04:55 PM Ethylbenzene 0.50 µg/L 1ND 0.11 9/15/2021 04:55 PM
Freon-113 0.50 µg/L 1ND 0.28 9/15/2021 04:55 PM
Hexachlorobutadiene 0.50 µg/L 1ND 0.30 9/15/2021 04:55 PM Isopropylbenzene 0.50 µg/L 1ND 0.092 9/15/2021 04:55 PM m,p-Xylene 1.0 µg/L 1ND 0.23 9/15/2021 04:55 PM
Methylene chloride 2.0 µg/L 1ND 1.2 9/15/2021 04:55 PM
MTBE 0.50 µg/L 1ND 0.44 9/15/2021 04:55 PM
n-Butylbenzene 0.50 µg/L 1ND 0.093 9/15/2021 04:55 PM
n-Propylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:55 PM
Naphthalene 0.50 µg/L 1ND 0.41 9/15/2021 04:55 PM
o-Xylene 0.50 µg/L 1ND 0.087 9/15/2021 04:55 PM
sec-Butylbenzene 0.50 µg/L 1ND 0.076 9/15/2021 04:55 PM Styrene 0.50 µg/L 1ND 0.41 9/15/2021 04:55 PM
Tert-amyl methyl ether 0.50 µg/L 1ND 0.13 9/15/2021 04:55 PM Tert-Butanol 5.0 µg/L 1ND 2.8 9/15/2021 04:55 PM
tert-Butylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 04:55 PM Tetrachloroethene 0.50 µg/L 1ND 0.25 9/15/2021 04:55 PM Toluene 0.50 µg/L 1ND 0.13 9/15/2021 04:55 PM
trans-1,2-Dichloroethene 0.50 µg/L 1ND 0.27 9/15/2021 04:55 PM Trichloroethene 0.50 µg/L 1ND 0.26 9/15/2021 04:55 PM
Trichlorofluoromethane 0.50 µg/L 1ND 0.23 9/15/2021 04:55 PM Vinyl chloride 0.50 µg/L 1ND 0.19 9/15/2021 04:55 PM
Surr: 1,2-Dichloroethane-d4 72-132 %REC 1119 0 9/15/2021 04:55 PM Surr: 4-Bromofluorobenzene 80-120 %REC 187.4 0 9/15/2021 04:55 PM Surr: Dibromofluoromethane 78-130 %REC 1117 0 9/15/2021 04:55 PM Surr: Toluene-d8 80-120 %REC 195.0 0 9/15/2021 04:55 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 11 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-3
Collection Date: 9/10/2021 8:15:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-003
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 T/R Hydrocarbons: C13-C22 0.20 mg/L 1ND 0.20 9/14/2021 11:06 PM T/R Hydrocarbons: C23-C40 0.20 mg/L 1ND 0.20 9/14/2021 11:06 PM Surr: p-Terphenyl 54-139 %REC 188.6 0 9/14/2021 11:06 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC4_210914A E21VW088QC Batch: PrepDate:

GRO (C6 - C12) J0.050 mg/L 10.021 0.019 9/14/2021 08:51 PM Surr: Chlorobenzene - d5 66-123 %REC 195.8 0 9/14/2021 08:51 PM

DISSOLVED MERCURY BY COLD VAPOR TECHNIQUE
EPA 7470A
Analyst: DJRunID: NV00922-AA2_210915B 89300QC Batch: PrepDate: 9/15/2021 Mercury 0.20 µg/L 1ND 0.12 9/15/2021 04:30 PM

DISSOLVED METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3010A
RunID: NV00922-ICP2_210916A 89308QC Batch: PrepDate: 9/15/2021 Antimony 0.010 mg/L 1ND 0.0045 9/16/2021 12:06 PM
Arsenic 0.010 mg/L 1ND 0.0077 9/16/2021 12:06 PM
Barium 0.0030 mg/L 10.053 0.0010 9/16/2021 12:06 PM
Beryllium 0.0030 mg/L 1ND 0.00031 9/16/2021 12:06 PM
Cadmium 0.0030 mg/L 1ND 0.00085 9/16/2021 12:06 PM
Chromium J0.0030 mg/L 10.0028 0.00054 9/16/2021 08:15 PM Cobalt 0.0030 mg/L 1ND 0.0019 9/16/2021 12:06 PM
Copper 0.0050 mg/L 10.0074 0.0011 9/16/2021 12:06 PM
Lead 0.010 mg/L 1ND 0.0040 9/16/2021 12:06 PM
Molybdenum 0.0050 mg/L 10.014 0.0026 9/16/2021 12:06 PM Nickel 0.0050 mg/L 1ND 0.0020 9/16/2021 12:06 PM
Selenium 0.010 mg/L 1ND 0.0085 9/16/2021 12:06 PM
Silver 0.0030 mg/L 1ND 0.0024 9/16/2021 12:06 PM
Thallium 0.015 mg/L 10.024 0.0060 9/16/2021 08:15 PM
Vanadium 0.0030 mg/L 10.0040 0.0012 9/16/2021 08:15 PM
Zinc 0.010 mg/L 1ND 0.0077 9/16/2021 12:06 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 12 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4
Collection Date: 9/10/2021 7:58:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-004
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
1,1,1,2-Tetrachloroethane 0.50 µg/L 1ND 0.25 9/15/2021 05:19 PM 1,1,1-Trichloroethane 0.50 µg/L 1ND 0.20 9/15/2021 05:19 PM 1,1,2,2-Tetrachloroethane 0.50 µg/L 1ND 0.11 9/15/2021 05:19 PM 1,1,2-Trichloroethane 0.50 µg/L 1ND 0.23 9/15/2021 05:19 PM 1,1-Dichloroethane 0.50 µg/L 1ND 0.22 9/15/2021 05:19 PM 1,1-Dichloroethene 0.50 µg/L 1ND 0.17 9/15/2021 05:19 PM 1,1-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 05:19 PM 1,2,3-Trichlorobenzene 0.50 µg/L 1ND 0.37 9/15/2021 05:19 PM 1,2,3-Trichloropropane 0.50 µg/L 1ND 0.23 9/15/2021 05:19 PM 1,2,4-Trichlorobenzene 0.50 µg/L 1ND 0.10 9/15/2021 05:19 PM 1,2,4-Trimethylbenzene 0.50 µg/L 1ND 0.060 9/15/2021 05:19 PM 1,2-Dibromo-3-chloropropane 1.0 µg/L 1ND 0.32 9/15/2021 05:19 PM 1,2-Dibromoethane 0.50 µg/L 1ND 0.19 9/15/2021 05:19 PM 1,2-Dichlorobenzene 0.50 µg/L 1ND 0.089 9/15/2021 05:19 PM 1,2-Dichloroethane 0.50 µg/L 1ND 0.16 9/15/2021 05:19 PM 1,2-Dichloropropane 0.50 µg/L 1ND 0.16 9/15/2021 05:19 PM 1,3,5-Trimethylbenzene 0.50 µg/L 1ND 0.051 9/15/2021 05:19 PM 1,3-Dichlorobenzene 0.50 µg/L 1ND 0.081 9/15/2021 05:19 PM 1,3-Dichloropropane 0.50 µg/L 1ND 0.13 9/15/2021 05:19 PM 1,4-Dichlorobenzene 0.50 µg/L 1ND 0.080 9/15/2021 05:19 PM 2,2-Dichloropropane 0.50 µg/L 1ND 0.22 9/15/2021 05:19 PM 2-Butanone 5.0 µg/L 1ND 4.7 9/15/2021 05:19 PM
2-Chlorotoluene 0.50 µg/L 1ND 0.090 9/15/2021 05:19 PM
4-Chlorotoluene 0.50 µg/L 1ND 0.065 9/15/2021 05:19 PM
4-Isopropyltoluene 0.50 µg/L 1ND 0.085 9/15/2021 05:19 PM Benzene 0.50 µg/L 1ND 0.11 9/15/2021 05:19 PM
Bromobenzene 0.50 µg/L 1ND 0.093 9/15/2021 05:19 PM
Bromodichloromethane 0.50 µg/L 1ND 0.20 9/15/2021 05:19 PM Bromoform 0.50 µg/L 1ND 0.23 9/15/2021 05:19 PM
Bromomethane 1.0 µg/L 1ND 0.38 9/15/2021 05:19 PM
Carbon tetrachloride 0.50 µg/L 1ND 0.33 9/15/2021 05:19 PM Chlorobenzene 0.50 µg/L 1ND 0.11 9/15/2021 05:19 PM
Chloroethane 1.0 µg/L 1ND 0.69 9/15/2021 05:19 PM
Chloroform 0.50 µg/L 10.75 0.38 9/15/2021 05:19 PM
Chloromethane 0.50 µg/L 1ND 0.23 9/15/2021 05:19 PM
cis-1,2-Dichloroethene 0.50 µg/L 1ND 0.11 9/15/2021 05:19 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 13 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4
Collection Date: 9/10/2021 7:58:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-004
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
cis-1,3-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 05:19 PM Di-isopropyl ether 0.50 µg/L 1ND 0.15 9/15/2021 05:19 PM Dibromochloromethane 0.50 µg/L 1ND 0.23 9/15/2021 05:19 PM Dibromomethane 0.50 µg/L 1ND 0.13 9/15/2021 05:19 PM
Dichlorodifluoromethane 0.50 µg/L 1ND 0.16 9/15/2021 05:19 PM Ethyl tert-butyl ether 0.50 µg/L 1ND 0.10 9/15/2021 05:19 PM Ethylbenzene 0.50 µg/L 1ND 0.11 9/15/2021 05:19 PM
Freon-113 0.50 µg/L 1ND 0.28 9/15/2021 05:19 PM
Hexachlorobutadiene 0.50 µg/L 1ND 0.30 9/15/2021 05:19 PM Isopropylbenzene 0.50 µg/L 1ND 0.092 9/15/2021 05:19 PM m,p-Xylene 1.0 µg/L 1ND 0.23 9/15/2021 05:19 PM
Methylene chloride 2.0 µg/L 1ND 1.2 9/15/2021 05:19 PM
MTBE 0.50 µg/L 1ND 0.44 9/15/2021 05:19 PM
n-Butylbenzene 0.50 µg/L 1ND 0.093 9/15/2021 05:19 PM
n-Propylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 05:19 PM
Naphthalene 0.50 µg/L 1ND 0.41 9/15/2021 05:19 PM
o-Xylene 0.50 µg/L 1ND 0.087 9/15/2021 05:19 PM
sec-Butylbenzene 0.50 µg/L 1ND 0.076 9/15/2021 05:19 PM Styrene 0.50 µg/L 1ND 0.41 9/15/2021 05:19 PM
Tert-amyl methyl ether 0.50 µg/L 1ND 0.13 9/15/2021 05:19 PM Tert-Butanol 5.0 µg/L 1ND 2.8 9/15/2021 05:19 PM
tert-Butylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 05:19 PM Tetrachloroethene 0.50 µg/L 10.69 0.25 9/15/2021 05:19 PM Toluene 0.50 µg/L 1ND 0.13 9/15/2021 05:19 PM
trans-1,2-Dichloroethene 0.50 µg/L 1ND 0.27 9/15/2021 05:19 PM Trichloroethene 0.50 µg/L 1ND 0.26 9/15/2021 05:19 PM
Trichlorofluoromethane 0.50 µg/L 1ND 0.23 9/15/2021 05:19 PM Vinyl chloride 0.50 µg/L 1ND 0.19 9/15/2021 05:19 PM
Surr: 1,2-Dichloroethane-d4 72-132 %REC 1111 0 9/15/2021 05:19 PM Surr: 4-Bromofluorobenzene 80-120 %REC 190.0 0 9/15/2021 05:19 PM Surr: Dibromofluoromethane 78-130 %REC 1110 0 9/15/2021 05:19 PM Surr: Toluene-d8 80-120 %REC 197.6 0 9/15/2021 05:19 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 14 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: KB-4
Collection Date: 9/10/2021 7:58:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-004
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 T/R Hydrocarbons: C13-C22 0.20 mg/L 1ND 0.20 9/14/2021 11:35 PM T/R Hydrocarbons: C23-C40 0.20 mg/L 1ND 0.20 9/14/2021 11:35 PM Surr: p-Terphenyl 54-139 %REC 188.5 0 9/14/2021 11:35 PM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC4_210914A E21VW088QC Batch: PrepDate:

GRO (C6 - C12) J0.050 mg/L 10.021 0.019 9/14/2021 09:21 PM Surr: Chlorobenzene - d5 66-123 %REC 190.9 0 9/14/2021 09:21 PM

DISSOLVED MERCURY BY COLD VAPOR TECHNIQUE
EPA 7470A
Analyst: DJRunID: NV00922-AA2_210915B 89300QC Batch: PrepDate: 9/15/2021 Mercury 0.20 µg/L 1ND 0.12 9/15/2021 04:40 PM

DISSOLVED METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3010A
RunID: NV00922-ICP2_210916A 89308QC Batch: PrepDate: 9/15/2021 Antimony 0.010 mg/L 1ND 0.0045 9/16/2021 12:33 PM
Arsenic 0.010 mg/L 1ND 0.0077 9/16/2021 12:33 PM
Barium 0.0030 mg/L 10.042 0.0010 9/16/2021 12:33 PM
Beryllium 0.0030 mg/L 1ND 0.00031 9/16/2021 12:33 PM
Cadmium 0.0030 mg/L 1ND 0.00085 9/16/2021 12:33 PM
Chromium J0.0030 mg/L 10.0020 0.00054 9/16/2021 08:19 PM Cobalt 0.0030 mg/L 1ND 0.0019 9/16/2021 12:33 PM
Copper 0.0050 mg/L 10.0074 0.0011 9/16/2021 12:33 PM
Lead 0.010 mg/L 1ND 0.0040 9/16/2021 12:33 PM
Molybdenum 0.0050 mg/L 10.017 0.0026 9/16/2021 12:33 PM Nickel 0.0050 mg/L 1ND 0.0020 9/16/2021 12:33 PM
Selenium 0.010 mg/L 1ND 0.0085 9/16/2021 12:33 PM
Silver 0.0030 mg/L 1ND 0.0024 9/16/2021 12:33 PM
Thallium 0.015 mg/L 10.026 0.0060 9/16/2021 08:19 PM
Vanadium 0.0030 mg/L 10.0035 0.0012 9/16/2021 08:19 PM
Zinc 0.010 mg/L 1ND 0.0077 9/16/2021 12:33 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 15 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: B-1
Collection Date: 9/13/2021 12:31:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-005
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
1,1,1,2-Tetrachloroethane 0.50 µg/L 1ND 0.25 9/15/2021 05:43 PM 1,1,1-Trichloroethane 0.50 µg/L 1ND 0.20 9/15/2021 05:43 PM 1,1,2,2-Tetrachloroethane 0.50 µg/L 1ND 0.11 9/15/2021 05:43 PM 1,1,2-Trichloroethane 0.50 µg/L 1ND 0.23 9/15/2021 05:43 PM 1,1-Dichloroethane 0.50 µg/L 1ND 0.22 9/15/2021 05:43 PM 1,1-Dichloroethene 0.50 µg/L 1ND 0.17 9/15/2021 05:43 PM 1,1-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 05:43 PM 1,2,3-Trichlorobenzene 0.50 µg/L 1ND 0.37 9/15/2021 05:43 PM 1,2,3-Trichloropropane 0.50 µg/L 1ND 0.23 9/15/2021 05:43 PM 1,2,4-Trichlorobenzene 0.50 µg/L 1ND 0.10 9/15/2021 05:43 PM 1,2,4-Trimethylbenzene 0.50 µg/L 1ND 0.060 9/15/2021 05:43 PM 1,2-Dibromo-3-chloropropane 1.0 µg/L 1ND 0.32 9/15/2021 05:43 PM 1,2-Dibromoethane 0.50 µg/L 1ND 0.19 9/15/2021 05:43 PM 1,2-Dichlorobenzene 0.50 µg/L 1ND 0.089 9/15/2021 05:43 PM 1,2-Dichloroethane 0.50 µg/L 1ND 0.16 9/15/2021 05:43 PM 1,2-Dichloropropane 0.50 µg/L 1ND 0.16 9/15/2021 05:43 PM 1,3,5-Trimethylbenzene 0.50 µg/L 1ND 0.051 9/15/2021 05:43 PM 1,3-Dichlorobenzene 0.50 µg/L 1ND 0.081 9/15/2021 05:43 PM 1,3-Dichloropropane 0.50 µg/L 1ND 0.13 9/15/2021 05:43 PM 1,4-Dichlorobenzene 0.50 µg/L 1ND 0.080 9/15/2021 05:43 PM 2,2-Dichloropropane 0.50 µg/L 1ND 0.22 9/15/2021 05:43 PM 2-Butanone 5.0 µg/L 1ND 4.7 9/15/2021 05:43 PM
2-Chlorotoluene 0.50 µg/L 1ND 0.090 9/15/2021 05:43 PM
4-Chlorotoluene 0.50 µg/L 1ND 0.065 9/15/2021 05:43 PM
4-Isopropyltoluene 0.50 µg/L 1ND 0.085 9/15/2021 05:43 PM Benzene 0.50 µg/L 1ND 0.11 9/15/2021 05:43 PM
Bromobenzene 0.50 µg/L 1ND 0.093 9/15/2021 05:43 PM
Bromodichloromethane 0.50 µg/L 1ND 0.20 9/15/2021 05:43 PM Bromoform 0.50 µg/L 1ND 0.23 9/15/2021 05:43 PM
Bromomethane 1.0 µg/L 1ND 0.38 9/15/2021 05:43 PM
Carbon tetrachloride 0.50 µg/L 1ND 0.33 9/15/2021 05:43 PM Chlorobenzene 0.50 µg/L 1ND 0.11 9/15/2021 05:43 PM
Chloroethane 1.0 µg/L 1ND 0.69 9/15/2021 05:43 PM
Chloroform 0.50 µg/L 1ND 0.38 9/15/2021 05:43 PM
Chloromethane 0.50 µg/L 1ND 0.23 9/15/2021 05:43 PM
cis-1,2-Dichloroethene 0.50 µg/L 1ND 0.11 9/15/2021 05:43 PM Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 16 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: B-1
Collection Date: 9/13/2021 12:31:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-005
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

VOLATILE ORGANIC COMPOUNDS BY GC/MS
EPA 8260B
Analyst: AWRunID: CA01638-MS08_210915A R21VW118QC Batch: PrepDate:
cis-1,3-Dichloropropene 0.50 µg/L 1ND 0.16 9/15/2021 05:43 PM Di-isopropyl ether 0.50 µg/L 1ND 0.15 9/15/2021 05:43 PM Dibromochloromethane 0.50 µg/L 1ND 0.23 9/15/2021 05:43 PM Dibromomethane 0.50 µg/L 1ND 0.13 9/15/2021 05:43 PM
Dichlorodifluoromethane 0.50 µg/L 1ND 0.16 9/15/2021 05:43 PM Ethyl tert-butyl ether 0.50 µg/L 1ND 0.10 9/15/2021 05:43 PM Ethylbenzene 0.50 µg/L 1ND 0.11 9/15/2021 05:43 PM
Freon-113 0.50 µg/L 1ND 0.28 9/15/2021 05:43 PM
Hexachlorobutadiene 0.50 µg/L 1ND 0.30 9/15/2021 05:43 PM Isopropylbenzene 0.50 µg/L 1ND 0.092 9/15/2021 05:43 PM m,p-Xylene 1.0 µg/L 1ND 0.23 9/15/2021 05:43 PM
Methylene chloride 2.0 µg/L 1ND 1.2 9/15/2021 05:43 PM
MTBE 0.50 µg/L 1ND 0.44 9/15/2021 05:43 PM
n-Butylbenzene 0.50 µg/L 1ND 0.093 9/15/2021 05:43 PM
n-Propylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 05:43 PM
Naphthalene 0.50 µg/L 1ND 0.41 9/15/2021 05:43 PM
o-Xylene 0.50 µg/L 1ND 0.087 9/15/2021 05:43 PM
sec-Butylbenzene 0.50 µg/L 1ND 0.076 9/15/2021 05:43 PM Styrene 0.50 µg/L 1ND 0.41 9/15/2021 05:43 PM
Tert-amyl methyl ether 0.50 µg/L 1ND 0.13 9/15/2021 05:43 PM Tert-Butanol 5.0 µg/L 1ND 2.8 9/15/2021 05:43 PM
tert-Butylbenzene 0.50 µg/L 1ND 0.10 9/15/2021 05:43 PM Tetrachloroethene 0.50 µg/L 10.69 0.25 9/15/2021 05:43 PM Toluene 0.50 µg/L 1ND 0.13 9/15/2021 05:43 PM
trans-1,2-Dichloroethene 0.50 µg/L 1ND 0.27 9/15/2021 05:43 PM Trichloroethene 0.50 µg/L 1ND 0.26 9/15/2021 05:43 PM
Trichlorofluoromethane 0.50 µg/L 1ND 0.23 9/15/2021 05:43 PM Vinyl chloride 0.50 µg/L 1ND 0.19 9/15/2021 05:43 PM
Surr: 1,2-Dichloroethane-d4 72-132 %REC 1114 0 9/15/2021 05:43 PM Surr: 4-Bromofluorobenzene 80-120 %REC 188.5 0 9/15/2021 05:43 PM Surr: Dibromofluoromethane 78-130 %REC 1114 0 9/15/2021 05:43 PM Surr: Toluene-d8 80-120 %REC 196.4 0 9/15/2021 05:43 PM

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 17 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
Client Sample ID: B-1
Collection Date: 9/13/2021 12:31:00 PM
Matrix: GROUNDWATER
CLIENT: Kleinfelder
Lab Order: N047085
Lab ID: N047085-005
ASSET Laboratories Print Date: 20-Sep-21
Analyses Result Qual Units Date AnalyzedDFPQLMDL

ANALYTICAL RESULTS

HYDROCARBON CHAIN IDENTIFICATION
EPA 8015B(M)
Analyst: PL
EPA 3510C
RunID: NV00922-GC1_210914B 89279QC Batch: PrepDate: 9/14/2021 T/R Hydrocarbons: C13-C22 0.20 mg/L 1ND 0.20 9/15/2021 12:04 AM T/R Hydrocarbons: C23-C40 0.20 mg/L 1ND 0.20 9/15/2021 12:04 AM Surr: p-Terphenyl 54-139 %REC 178.4 0 9/15/2021 12:04 AM

GASOLINE RANGE ORGANICS BY GC/FID
EPA 8015B
Analyst: YGRunID: NV00922-GC4_210914A E21VW088QC Batch: PrepDate:

GRO (C6 - C12) J0.050 mg/L 10.022 0.019 9/14/2021 09:52 PM Surr: Chlorobenzene - d5 66-123 %REC 193.7 0 9/14/2021 09:52 PM

DISSOLVED MERCURY BY COLD VAPOR TECHNIQUE
EPA 7470A
Analyst: DJRunID: NV00922-AA2_210915B 89300QC Batch: PrepDate: 9/15/2021 Mercury 0.20 µg/L 1ND 0.12 9/15/2021 04:43 PM

DISSOLVED METALS BY ICP
EPA 6010B
Analyst: DJ
EPA 3010A
RunID: NV00922-ICP2_210916A 89308QC Batch: PrepDate: 9/15/2021 Antimony 0.010 mg/L 1ND 0.0045 9/16/2021 12:38 PM
Arsenic 0.010 mg/L 1ND 0.0077 9/16/2021 12:38 PM
Barium 0.0030 mg/L 10.040 0.0010 9/16/2021 12:38 PM
Beryllium 0.0030 mg/L 1ND 0.00031 9/16/2021 12:38 PM
Cadmium 0.0030 mg/L 1ND 0.00085 9/16/2021 12:38 PM
Chromium 0.0030 mg/L 10.0039 0.00054 9/16/2021 08:23 PM Cobalt 0.0030 mg/L 1ND 0.0019 9/16/2021 12:38 PM
Copper 0.0050 mg/L 10.0071 0.0011 9/16/2021 12:38 PM
Lead 0.010 mg/L 1ND 0.0040 9/16/2021 12:38 PM
Molybdenum 0.0050 mg/L 10.0083 0.0026 9/16/2021 12:38 PM Nickel 0.0050 mg/L 1ND 0.0020 9/16/2021 12:38 PM
Selenium 0.010 mg/L 1ND 0.0085 9/16/2021 12:38 PM
Silver 0.0030 mg/L 1ND 0.0024 9/16/2021 12:38 PM
Thallium 0.015 mg/L 10.025 0.0060 9/16/2021 08:23 PM
Vanadium 0.0030 mg/L 10.0035 0.0012 9/16/2021 08:23 PM
Zinc 0.010 mg/L 1ND 0.0077 9/16/2021 12:38 PM
Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified DO Surrogate Diluted Out 18 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

20-Sep-21Date:ASSET Laboratories
Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_WD
Sample ID: MB-89308
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: PBW
RunNo: 156702
SeqNo: 4353195
MBLKSampType: TestCode: 6010_WD
EPA 3010A
Antimony 0.010ND
Arsenic 0.010ND
Barium 0.0030ND
Beryllium 0.0030ND
Cadmium 0.0030ND
Cobalt 0.0030ND
Copper 0.0050ND
Lead 0.010ND
Molybdenum 0.0050ND
Nickel 0.0050ND
Selenium 0.010ND
Silver 0.0030ND
Thallium 0.015ND
Vanadium 0.0030ND
Zinc 0.010ND
Sample ID: N047085-001C-MS
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: ZZZZZZ
RunNo: 156702
SeqNo: 4353200
MSSampType: TestCode: 6010_WD
EPA 3010A
Antimony 0.5000 104 75 1250.010 00.522
Arsenic 0.5000 106 75 1250.010 00.531
Barium 0.5000 92.7 75 1250.0030 0.043940.508
Beryllium 0.5000 92.1 75 1250.0030 00.461
Cadmium 0.5000 85.3 75 1250.0030 00.426
Cobalt 0.5000 92.1 75 1250.0030 00.461
Copper 0.5000 91.1 75 1250.0050 0.0085960.464
Lead 0.5000 96.8 75 1250.010 00.484
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 19 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_WD
Sample ID: N047085-001C-MS
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: ZZZZZZ
RunNo: 156702
SeqNo: 4353200
MSSampType: TestCode: 6010_WD
EPA 3010A
Molybdenum 0.5000 92.0 75 1250.0050 0.022600.482
Nickel 0.5000 89.8 75 1250.0050 00.449
Selenium 0.5000 101 75 1250.010 00.503
Silver 0.5000 140 75 125 S0.0030 00.700
Thallium 0.5000 80.6 75 1250.015 0.031160.434
Vanadium 0.5000 85.1 90 113 S0.0030 0.0029630.428
Zinc 0.5000 98.8 64 1250.010 00.494
Sample ID: N047085-001C-MSD
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: ZZZZZZ
RunNo: 156702
SeqNo: 4353201
MSDSampType: TestCode: 6010_WD
EPA 3010A
Antimony 0.5000 107 75 125 200.010 0 0.5216 2.390.534
Arsenic 0.5000 110 75 125 200.010 0 0.5311 3.510.550
Barium 0.5000 96.2 75 125 200.0030 0.04394 0.5077 3.380.525 Beryllium 0.5000 94.1 75 125 200.0030 0 0.4607 2.050.470 Cadmium 0.5000 87.8 75 125 200.0030 0 0.4263 2.990.439
Cobalt 0.5000 95.3 75 125 200.0030 0 0.4607 3.330.476
Copper 0.5000 94.3 75 125 200.0050 0.008596 0.4639 3.490.480 Lead 0.5000 100 75 125 200.010 0 0.4838 3.590.501
Molybdenum 0.5000 95.3 75 125 200.0050 0.02260 0.4824 3.430.499 Nickel 0.5000 92.8 75 125 200.0050 0 0.4489 3.280.464
Selenium 0.5000 104 75 125 200.010 0 0.5026 3.270.519
Silver 0.5000 144 75 125 20 S0.0030 0 0.7001 3.040.722
Thallium 0.5000 84.0 75 125 200.015 0.03116 0.4342 3.870.451 Vanadium 0.5000 87.9 90 113 20 S0.0030 0.002963 0.4282 3.230.442 Zinc 0.5000 102 64 125 200.010 0 0.4940 3.550.512
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 20 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_WD
Sample ID: LCS-89308
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: LCSW
RunNo: 156702
SeqNo: 4353235
LCSSampType: TestCode: 6010_WD
EPA 3010A
Antimony 0.5000 113 85 1150.010 00.566
Arsenic 0.5000 110 85 1150.010 00.552
Barium 0.5000 111 85 1150.0030 00.556
Beryllium 0.5000 100 85 1150.0030 00.500
Cadmium 0.5000 97.7 85 1150.0030 00.489
Cobalt 0.5000 104 85 1150.0030 00.518
Copper 0.5000 99.5 85 1150.0050 00.497
Lead 0.5000 111 85 1150.010 00.556
Molybdenum 0.5000 99.3 85 1150.0050 00.497
Nickel 0.5000 104 85 1150.0050 00.518
Selenium 0.5000 98.5 85 1150.010 00.492
Silver 0.5000 121 85 115 S0.0030 00.606
Thallium 0.5000 94.0 85 1150.015 00.470
Vanadium 0.5000 98.4 85 1150.0030 00.492
Zinc 0.5000 108 85 1150.010 00.540
Sample ID: MB-89308
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: PBW
RunNo: 156725
SeqNo: 4353520
MBLKSampType: TestCode: 6010_WD
EPA 3010A
Chromium 0.0030ND
Sample ID: LCS-89308
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: LCSW
RunNo: 156725
SeqNo: 4353521
LCSSampType: TestCode: 6010_WD
EPA 3010A
Chromium 0.5000 99.0 85 1150.0030 00.495
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 21 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 6010_WD
Sample ID: N047085-001C-MS
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: ZZZZZZ
RunNo: 156725
SeqNo: 4353529
MSSampType: TestCode: 6010_WD
EPA 3010A
Chromium 0.5000 82.9 75 1250.0030 0.0035630.418
Sample ID: N047085-001C-MSD
Batch ID: 89308 TestNo: EPA 6010B Analysis Date: 9/16/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: ZZZZZZ
RunNo: 156725
SeqNo: 4353530
MSDSampType: TestCode: 6010_WD
EPA 3010A
Chromium 0.5000 85.0 75 125 200.0030 0.003563 0.4183 2.370.428 Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 22 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 7470_W_DISS
Sample ID: MB-89300
Batch ID: 89300 TestNo: EPA 7470A Analysis Date: 9/15/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/L
PQL
Client ID: PBW
RunNo: 156687
SeqNo: 4351533
MBLKSampType: TestCode: 7470_W_DISS
Mercury 0.20ND
Sample ID: LCS-89300
Batch ID: 89300 TestNo: EPA 7470A Analysis Date: 9/15/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/L
PQL
Client ID: LCSW
RunNo: 156687
SeqNo: 4351534
LCSSampType: TestCode: 7470_W_DISS
Mercury 5.000 88.6 85 1150.20 04.430
Sample ID: N047085-002C-MS
Batch ID: 89300 TestNo: EPA 7470A Analysis Date: 9/15/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/L
PQL
Client ID: ZZZZZZ
RunNo: 156687
SeqNo: 4351539
MSSampType: TestCode: 7470_W_DISS
Mercury 5.000 83.0 75 1250.20 04.150
Sample ID: N047085-002C-MSD
Batch ID: 89300 TestNo: EPA 7470A Analysis Date: 9/15/2021 Prep Date: 9/15/2021
Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/L
PQL
Client ID: ZZZZZZ
RunNo: 156687
SeqNo: 4351540
MSDSampType: TestCode: 7470_W_DISS
Mercury 5.000 84.2 75 125 200.20 0 4.150 1.444.210
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 23 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 8015GAS_WC6C12
Sample ID: E210914LCS
Batch ID: E21VW088 TestNo: EPA 8015B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: LCSW
RunNo: 156647
SeqNo: 4350902
LCSSampType: TestCode: 8015GAS_WC
GRO (C6 - C12) 1.000 107 62 1400.050 01.074
Surr: Chlorobenzene - d5 50.00 94.6 66 12347.296
Sample ID: E210914LCSD
Batch ID: E21VW088 TestNo: EPA 8015B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: LCSS02
RunNo: 156647
SeqNo: 4350903
LCSDSampType: TestCode: 8015GAS_WC
GRO (C6 - C12) 1.000 113 62 140 300.050 0 1.074 5.081.130 Surr: Chlorobenzene - d5 50.00 97.9 66 123 048.964
Sample ID: E210914MB
Batch ID: E21VW088 TestNo: EPA 8015B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: PBW
RunNo: 156647
SeqNo: 4350904
MBLKSampType: TestCode: 8015GAS_WC
GRO (C6 - C12) J0.0500.021
Surr: Chlorobenzene - d5 50.00 99.8 66 12349.880
Sample ID: E210914MB1
Batch ID: E21VW088 TestNo: EPA 8015B Analysis Date: 9/14/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: PBW
RunNo: 156647
SeqNo: 4350905
MBLKSampType: TestCode: 8015GAS_WC
GRO (C6 - C12) J0.0500.021
Surr: Chlorobenzene - d5 50.00 96.5 66 12348.259
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 24 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 8015GAS_WC6C12
Sample ID: E210914LCS
Batch ID: E21VW089 TestNo: EPA 8015B Analysis Date: 9/15/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: LCSW
RunNo: 156681
SeqNo: 4351482
LCSSampType: TestCode: 8015GAS_WC
GRO (C6 - C12) 1.000 101 62 1400.050 01.011
Surr: Chlorobenzene - d5 50.00 81.5 66 12340.743
Sample ID: E210914MB
Batch ID: E21VW089 TestNo: EPA 8015B Analysis Date: 9/15/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: PBW
RunNo: 156681
SeqNo: 4351483
MBLKSampType: TestCode: 8015GAS_WC
GRO (C6 - C12) J0.0500.020
Surr: Chlorobenzene - d5 50.00 80.9 66 12340.459
Sample ID: N047095-002AMS
Batch ID: E21VW089 TestNo: EPA 8015B Analysis Date: 9/15/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: ZZZZZZ
RunNo: 156681
SeqNo: 4351485
MSSampType: TestCode: 8015GAS_WC
GRO (C6 - C12) 1.000 98.4 62 1400.050 0.021001.005
Surr: Chlorobenzene - d5 50.00 81.5 66 12340.732
Sample ID: N047095-002AMSD
Batch ID: E21VW089 TestNo: EPA 8015B Analysis Date: 9/15/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: mg/L
PQL
Client ID: ZZZZZZ
RunNo: 156681
SeqNo: 4351486
MSDSampType: TestCode: 8015GAS_WC
GRO (C6 - C12) 1.000 106 62 140 300.050 0.02100 1.005 6.921.077 Surr: Chlorobenzene - d5 50.00 83.1 66 123 041.528
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 25 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260WATERP
Sample ID: R210915-LCS
Batch ID: R21VW118 TestNo: EPA 8260B Analysis Date: 9/15/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/L
PQL
Client ID: LCSW
RunNo: 156691
SeqNo: 4351635
LCSSampType: TestCode: 8260WATERP
1,1,1,2-Tetrachloroethane 20.00 105 77 1230.50 021.030
1,1,1-Trichloroethane 20.00 106 77 1240.50 021.260
1,1,2,2-Tetrachloroethane 20.00 96.8 73 1200.50 019.350 1,1,2-Trichloroethane 20.00 102 74 1200.50 020.340
1,1-Dichloroethane 20.00 99.0 74 1250.50 019.800
1,1-Dichloroethene 20.00 97.9 70 1310.50 019.580
1,1-Dichloropropene 20.00 116 80 1280.50 023.200
1,2,3-Trichlorobenzene 20.00 110 78 1220.50 021.940
1,2,3-Trichloropropane 20.00 103 70 1200.50 020.520
1,2,4-Trichlorobenzene 20.00 106 77 1210.50 021.260
1,2,4-Trimethylbenzene 20.00 104 80 1300.50 020.710
1,2-Dibromo-3-chloropropane 20.00 101 66 1311.0 020.270 1,2-Dibromoethane 20.00 107 74 1210.50 021.400
1,2-Dichlorobenzene 20.00 108 80 1200.50 021.500
1,2-Dichloroethane 20.00 103 77 1200.50 020.550
1,2-Dichloropropane 20.00 98.2 80 1200.50 019.640
1,3,5-Trimethylbenzene 20.00 105 80 1270.50 020.960
1,3-Dichlorobenzene 20.00 110 80 1200.50 021.990
1,3-Dichloropropane 20.00 101 78 1200.50 020.210
1,4-Dichlorobenzene 20.00 105 80 1200.50 021.080
2,2-Dichloropropane 20.00 105 69 1340.50 021.020
2-Butanone 200.0 85.8 44 1415.0 0171.640
2-Chlorotoluene 20.00 111 80 1200.50 022.130
4-Chlorotoluene 20.00 113 80 1200.50 022.590
4-Isopropyltoluene 20.00 102 80 1290.50 020.380
Benzene 20.00 107 80 1200.50 021.390
Bromobenzene 20.00 107 80 1200.50 021.400
Bromodichloromethane 20.00 103 79 1200.50 020.610
Bromoform 20.00 108 68 1310.50 021.690
Bromomethane 20.00 120 37 1691.0 023.940
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 26 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260WATERP
Sample ID: R210915-LCS
Batch ID: R21VW118 TestNo: EPA 8260B Analysis Date: 9/15/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/L
PQL
Client ID: LCSW
RunNo: 156691
SeqNo: 4351635
LCSSampType: TestCode: 8260WATERP
Carbon tetrachloride 20.00 116 72 1360.50 023.180
Chlorobenzene 20.00 106 80 1200.50 021.150
Chloroethane 20.00 102 61 1551.0 020.390
Chloroform 20.00 98.7 77 1240.50 019.740
Chloromethane 20.00 92.6 52 1470.50 018.510
cis-1,2-Dichloroethene 20.00 103 77 1200.50 020.510
cis-1,3-Dichloropropene 20.00 105 73 1230.50 020.930
Di-isopropyl ether 20.00 98.4 66 1310.50 019.690
Dibromochloromethane 20.00 106 75 1240.50 021.300
Dibromomethane 20.00 99.8 80 1200.50 019.970
Dichlorodifluoromethane 20.00 89.3 55 1500.50 017.860
Ethyl tert-butyl ether 20.00 117 70 1270.50 023.420
Ethylbenzene 20.00 111 80 1200.50 022.190
Freon-113 20.00 105 59 1390.50 021.060
Hexachlorobutadiene 20.00 112 80 1200.50 022.410
Isopropylbenzene 20.00 101 80 1260.50 020.140
m,p-Xylene 40.00 105 80 1251.0 042.120
Methylene chloride 20.00 94.4 69 1292.0 018.890
MTBE 20.00 102 64 1310.50 020.370
n-Butylbenzene 20.00 98.8 80 1270.50 019.760
n-Propylbenzene 20.00 101 80 1220.50 020.220
Naphthalene 20.00 89.8 68 1270.50 017.970
o-Xylene 20.00 97.5 80 1230.50 019.500
sec-Butylbenzene 20.00 103 80 1270.50 020.560
Styrene 20.00 102 80 1250.50 020.300
Tert-amyl methyl ether 20.00 121 67 1280.50 024.190
Tert-Butanol 100.0 92.8 44 1465.0 092.770
tert-Butylbenzene 20.00 103 80 1240.50 020.520
Tetrachloroethene 20.00 113 80 1230.50 022.600
Toluene 20.00 112 80 1200.50 022.440
Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limits ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values 27 of 36

NEVADA|P:702.307.2659 F:702.307.2691
3151 W. Post Rd., Las Vegas, NV 89118
ELAP Cert 2676 | NV Cert NV00922
ORELAP/NELAP Cert 4046

“Serving Clients with Passion and Professionalism”
CALIFORNIA|P:562.219.7435 F:562.219.7436
11110 Artesia Blvd., Ste B, Cerritos, CA 90703
ELAP Cert 2921
EPA ID CA01638

Project: Costco Culver City, 20201678.001A
CLIENT: Kleinfelder
Work Order: N047085 ANALYTICAL QC SUMMARY REPORT
TestCode: 8260WATERP
Sample ID: R210915-LCS
Batch ID: R21VW118 TestNo: EPA 8260B Analysis Date: 9/15/2021 Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual Units: µg/L
PQL
Client ID: LCSW
RunNo: 156691
SeqNo: 4351635
LCSSampType: TestCode: 8260WATERP
trans-1,2-Dichloroethene 20.00 101 70 1320.50 020.290
Trichloroethene 20.00 110 80 1200.50 021.990
Trichlorofluoromethane 20.00 104 67 1510.50 020.780
Vinyl chloride 20.00 93.6 69 1370.50 018.710
Surr: 1,2-Dichloroethane-d4 25.00 93.2 72 13223.310
Surr: 4-Bromofluorobenzene 25.00 97.9 80 12024.480
Surr: Dibromofluoromethane 25.00 94.6 78 13023.660
Surr: Toluene-d8 25.00 99.4 80 12024.850
Sample ID: N047010-003A-MS
Batch ID: R21VW118 TestNo: EPA 8260B Analysis Date: 9/15/2021 Prep Date: