Cities Index.
Agenda packet, second session

Brentwood City Council
February 10, 2026

Document
Agenda packet, second session
Meeting
February 10, 2026
Body
Brentwood City Council
Pages
1,860
Original file
50.4 MB
Text extracted from the city's file for reading and search. Open the original on pub-brentwood.escribemeetings.com. That file is the official record.

Sample Summary
Cem Atabek
Baseline
Environmental
388 17th St
Suite 230
Oakland, CA 94612
Lab Job #: 523589
Project No: 24201-01
Location: East County Service Center
Date Received: 01/08/25
Sample ID Lab ID Collected Matrix
B-9:0.0-0.5 523589-001 01/08/25 07:55 Soil
B-9:1.5-2.0 523589-002 01/08/25 08:02 Soil
B-10:0.0-0.5 523589-003 01/08/25 08:23 Soil
B-10:1.5-2.0 523589-004 01/08/25 08:29 Soil
B-11:0.0-0.5 523589-005 01/08/25 09:06 Soil
B-11:1.5-2.0 523589-006 01/08/25 09:11 Soil
B-12:0.0-0.5 523589-007 01/08/25 08:46 Soil
B-12:1.5-2.0 523589-008 01/08/25 08:52 Soil
COMP-5 523589-009 01/08/25 00:00 Soil
COMP-6 523589-010 01/08/25 00:00 Soil
B-13:0.0-0.5 523589-011 01/08/25 09:27 Soil
B-13:1.5-2.0 523589-012 01/08/25 09:32 Soil
B-14:0.0-0.5 523589-013 01/08/25 09:59 Soil
B-14:1.5-2.0 523589-014 01/08/25 10:04 Soil
B-15:0.0-0.5 523589-015 01/08/25 10:51 Soil
B-15:1.5-2.0 523589-016 01/08/25 10:56 Soil
COMP-7 523589-017 01/08/25 00:00 Soil
COMP-8 523589-018 01/08/25 00:00 Soil
B-16:0.0-0.5 523589-019 01/08/25 10:27 Soil
B-16:1.5-2.0 523589-020 01/08/25 10:32 Soil
B-17:0.0-0.5 523589-021 01/08/25 11:16 Soil
B-17:1.5-2.0 523589-022 01/08/25 11:23 Soil
B-18:0.0-0.5 523589-023 01/08/25 11:38 Soil
B-18:1.5-2.0 523589-024 01/08/25 11:44 Soil
COMP-9 523589-025 01/08/25 00:00 Soil
COMP-10 523589-026 01/08/25 00:00 Soil
2 of 98
HA y

ANALYTICAL

Page 1493 of 1860 ends

Case Narrative
Baseline Environmental
388 17th St
Suite 230
Oakland, CA 94612
Cem Atabek
Lab Job Number: 523589
Project No: 24201-01
Location: East County Service
Center
Date Received: 01/08/25
This data package contains sample and QC results for twenty soil samples, four three-point soil composites, and two four-point soil composites, requested for the above referenced project on 01/09/25. The samples were received cold and intact.

Report was revised and reissued on 1-22-25 to report further requested analyses.

TPH-Extractables by GC (EPA 8015M):

No analytical problems were encountered.

Volatile Organics by GC/MS (EPA 8260B):

Low recovery was observed for chlorobenzene in the MS of COMP-5 (lab # 523589-009); the BS/BSD were within limits, and the associated RPD was within limits.

No other analytical problems were encountered.

Pesticides (EPA 8081A):

High recoveries were observed for 4,4'-DDD, dieldrin, and endrin in the MS for batch 360079; the parent sample was not a project sample, the LCS was within limits, and the associated RPDs were within limits.

No other analytical problems were encountered.

Metals (EPA 6010B and EPA 7471A) Soil:

Low recoveries were observed for antimony in the MS/MSD of B-9:0.0-0.5 (lab # 523589-001); the LCS was within limits, and the associated RPD was within limits.

No other analytical problems were encountered.

Metals (EPA 6010B) WET Leachate:

No analytical problems were encountered.
1 of 1
3 of 98
A

ANALYTICAL
•
•
•
•
•
•
•
•

Page 1494 of 1860 ends

Cem Atabek
Baseline Environmental
388 17th St
Suite 230
Oakland, CA 94612
Lab Job #: 523589
Project No: 24201-01
Location: East County Service Center
Date Received: 01/08/25
Sample ID: B-9:0.0-0.5 Lab ID: 523589-001 Collected: 01/08/25 07:55 Matrix: Soil
523589-001 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.0 mg/Kg 0.97
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 780 ug/Kg 51
4,4'-DDD 11 #,C ug/Kg 5.1
4,4'-DDT 210 ug/Kg 5.1
Sample ID: B-9:1.5-2.0 Lab ID: 523589-002 Collected: 01/08/25 08:02 Matrix: Soil
523589-002 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 14 ug/Kg 4.9
Sample ID: B-10:0.0-0.5 Lab ID: 523589-003 Collected: 01/08/25 08:23 Matrix: Soil
523589-003 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.3 mg/Kg 0.95
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 990 ug/Kg 49
4,4'-DDD 15 #,C ug/Kg 4.9
4,4'-DDT 250 ug/Kg 4.9
Sample ID: B-10:1.5-2.0 Lab ID: 523589-004 Collected: 01/08/25 08:29 Matrix: Soil
523589-004 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 7.1 ug/Kg 4.9
1 of 8 v55.1
Detection Summary
Results for any subcontracted analyses are not included in this summary. Data qualifiers and additional information necessary for the interpretation of the test results are contained in the PDF file and may not be included in this summary. 4 of 98 HA .P

ANALYTICAL

Page 1495 of 1860 ends

Sample ID: B-11:0.0-0.5 Lab ID: 523589-005 Collected: 01/08/25 09:06 Matrix: Soil
523589-005 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.8 mg/Kg 0.95
Method: EPA 8081A
Prep Method: EPA 3546
Dieldrin 12 C ug/Kg 4.9
4,4'-DDE 1,100 ug/Kg 49
4,4'-DDD 17 #,C ug/Kg 4.9
4,4'-DDT 310 ug/Kg 49
Sample ID: B-11:1.5-2.0 Lab ID: 523589-006 Collected: 01/08/25 09:11 Matrix: Soil
523589-006 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 21 ug/Kg 5.0
4,4'-DDT 5.9 ug/Kg 5.0
Sample ID: B-12:0.0-0.5 Lab ID: 523589-007 Collected: 01/08/25 08:46 Matrix: Soil
523589-007 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.5 mg/Kg 0.97
Method: EPA 8081A
Prep Method: EPA 3546
Dieldrin 7.0 C ug/Kg 5.1
4,4'-DDE 780 ug/Kg 51
4,4'-DDD 16 #,C ug/Kg 5.1
4,4'-DDT 230 ug/Kg 5.1
Sample ID: B-12:1.5-2.0 Lab ID: 523589-008 Collected: 01/08/25 08:52 Matrix: Soil
523589-008 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 9.7 ug/Kg 5.0
2 of 8 v55.1
Detection Summary
Results for any subcontracted analyses are not included in this summary. Data qualifiers and additional information necessary for the interpretation of the test results are contained in the PDF file and may not be included in this summary. 5 of 98 HA .P

ANALYTICAL

Page 1496 of 1860 ends

Sample ID: COMP-5 Lab ID: 523589-009 Collected: 01/08/25 Matrix: Soil
523589-009 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.5 mg/Kg 0.95
Barium 260 mg/Kg 0.95
Beryllium 0.54 mg/Kg 0.48
Chromium 57 mg/Kg 0.95
Cobalt 16 mg/Kg 0.48
Copper 46 mg/Kg 0.95
Lead 11 mg/Kg 0.95
Nickel 63 mg/Kg 0.95
Vanadium 76 mg/Kg 0.95
Zinc 76 mg/Kg 4.8
Sample ID: COMP-6 Lab ID: 523589-010 Collected: 01/08/25 Matrix: Soil
523589-010 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.0 mg/Kg 0.96
Barium 240 mg/Kg 0.96
Beryllium 0.65 mg/Kg 0.48
Chromium 63 mg/Kg 0.96
Cobalt 16 mg/Kg 0.48
Copper 45 mg/Kg 0.96
Lead 9.4 mg/Kg 0.96
Nickel 70 mg/Kg 0.96
Vanadium 83 mg/Kg 0.96
Zinc 76 mg/Kg 4.8
Sample ID: B-13:0.0-0.5 Lab ID: 523589-011 Collected: 01/08/25 09:27 Matrix: Soil
523589-011 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 9.0 mg/Kg 0.99
Method: EPA 8081A
Prep Method: EPA 3546
Dieldrin 8.8 C ug/Kg 4.9
4,4'-DDE 1,200 ug/Kg 49
4,4'-DDD 18 #,C ug/Kg 4.9
4,4'-DDT 330 ug/Kg 49
3 of 8 v55.1
Detection Summary
Results for any subcontracted analyses are not included in this summary. Data qualifiers and additional information necessary for the interpretation of the test results are contained in the PDF file and may not be included in this summary. 6 of 98 HA .P

ANALYTICAL

Page 1497 of 1860 ends

Sample ID: B-13:1.5-2.0 Lab ID: 523589-012 Collected: 01/08/25 09:32 Matrix: Soil
523589-012 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 68 ug/Kg 5.0
4,4'-DDT 8.1 ug/Kg 5.0
Sample ID: B-14:0.0-0.5 Lab ID: 523589-013 Collected: 01/08/25 09:59 Matrix: Soil
523589-013 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.2 mg/Kg 0.98
Method: EPA 8081A
Prep Method: EPA 3546
Dieldrin 6.5 C ug/Kg 4.9
4,4'-DDE 870 ug/Kg 49
4,4'-DDD 15 #,C ug/Kg 4.9
4,4'-DDT 270 ug/Kg 4.9
Sample ID: B-14:1.5-2.0 Lab ID: 523589-014 Collected: 01/08/25 10:04 Matrix: Soil
523589-014 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 32 ug/Kg 5.0
Sample ID: B-15:0.0-0.5 Lab ID: 523589-015 Collected: 01/08/25 10:51 Matrix: Soil
523589-015 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 9.0 mg/Kg 0.95
Method: EPA 8081A
Prep Method: EPA 3546
Dieldrin 8.7 C ug/Kg 5.0
4,4'-DDE 1,100 ug/Kg 50
4,4'-DDD 22 #,C ug/Kg 5.0
4,4'-DDT 400 ug/Kg 50
4 of 8 v55.1
Detection Summary
Results for any subcontracted analyses are not included in this summary. Data qualifiers and additional information necessary for the interpretation of the test results are contained in the PDF file and may not be included in this summary. 7 of 98 HA .P

ANALYTICAL

Page 1498 of 1860 ends

Sample ID: B-15:1.5-2.0 Lab ID: 523589-016 Collected: 01/08/25 10:56 Matrix: Soil
523589-016 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 20 ug/Kg 5.0
Sample ID: COMP-7 Lab ID: 523589-017 Collected: 01/08/25 Matrix: Soil
523589-017 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 7.9 mg/Kg 0.95
Barium 240 mg/Kg 0.95
Beryllium 0.51 mg/Kg 0.48
Chromium 55 mg/Kg 0.95
Cobalt 15 mg/Kg 0.48
Copper 43 mg/Kg 0.95
Lead 11 mg/Kg 0.95
Nickel 59 mg/Kg 0.95
Vanadium 74 mg/Kg 0.95
Zinc 72 mg/Kg 4.8
Sample ID: COMP-8 Lab ID: 523589-018 Collected: 01/08/25 Matrix: Soil
523589-018 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 7.8 mg/Kg 0.99
Barium 240 mg/Kg 0.99
Beryllium 0.51 mg/Kg 0.50
Chromium 57 mg/Kg 0.99
Cobalt 16 mg/Kg 0.50
Copper 43 mg/Kg 0.99
Lead 8.6 mg/Kg 0.99
Nickel 63 mg/Kg 0.99
Vanadium 75 mg/Kg 0.99
Zinc 68 mg/Kg 5.0
5 of 8 v55.1
Detection Summary
Results for any subcontracted analyses are not included in this summary. Data qualifiers and additional information necessary for the interpretation of the test results are contained in the PDF file and may not be included in this summary. 8 of 98 HA .P

ANALYTICAL

Page 1499 of 1860 ends

Sample ID: B-16:0.0-0.5 Lab ID: 523589-019 Collected: 01/08/25 10:27 Matrix: Soil
523589-019 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.5 mg/Kg 0.96
Method: EPA 8081A
Prep Method: EPA 3546
Dieldrin 8.0 C ug/Kg 5.0
4,4'-DDE 960 ug/Kg 50
4,4'-DDD 18 #,C ug/Kg 5.0
4,4'-DDT 280 ug/Kg 50
Sample ID: B-16:1.5-2.0 Lab ID: 523589-020 Collected: 01/08/25 10:32 Matrix: Soil
523589-020 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 680 ug/Kg 49
4,4'-DDT 190 ug/Kg 4.9
Sample ID: B-17:0.0-0.5 Lab ID: 523589-021 Collected: 01/08/25 11:16 Matrix: Soil
523589-021 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.0 mg/Kg 0.95
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 700 ug/Kg 25
4,4'-DDD 17 #,C ug/Kg 4.9
4,4'-DDT 160 ug/Kg 4.9
Sample ID: B-17:1.5-2.0 Lab ID: 523589-022 Collected: 01/08/25 11:23 No Detections
6 of 8 v55.1
Detection Summary
Results for any subcontracted analyses are not included in this summary. Data qualifiers and additional information necessary for the interpretation of the test results are contained in the PDF file and may not be included in this summary. 9 of 98 HA .P

ANALYTICAL

Page 1500 of 1860 ends

Sample ID: B-18:0.0-0.5 Lab ID: 523589-023 Collected: 01/08/25 11:38 Matrix: Soil
523589-023 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.4 mg/Kg 0.99
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 990 ug/Kg 50
4,4'-DDD 22 #,C ug/Kg 5.0
4,4'-DDT 270 ug/Kg 5.0
Sample ID: B-18:1.5-2.0 Lab ID: 523589-024 Collected: 01/08/25 11:44 Matrix: Soil
523589-024 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 43 ug/Kg 5.0
4,4'-DDT 7.3 ug/Kg 5.0
Sample ID: COMP-9 Lab ID: 523589-025 Collected: 01/08/25 Matrix: Soil
523589-025 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.3 mg/Kg 0.98
Barium 250 mg/Kg 0.98
Beryllium 0.52 mg/Kg 0.49
Chromium 57 mg/Kg 0.98
Cobalt 16 mg/Kg 0.49
Copper 45 mg/Kg 0.98
Lead 11 mg/Kg 0.98
Nickel 62 mg/Kg 0.98
Vanadium 77 mg/Kg 0.98
Zinc 75 mg/Kg 4.9
7 of 8 v55.1
Detection Summary
Results for any subcontracted analyses are not included in this summary. Data qualifiers and additional information necessary for the interpretation of the test results are contained in the PDF file and may not be included in this summary. 10 of 98 HA .P

ANALYTICAL

Page 1501 of 1860 ends

Sample ID: COMP-10 Lab ID: 523589-026 Collected: 01/08/25 Matrix: Soil
523589-026 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.1 mg/Kg 0.98
Barium 270 mg/Kg 0.98
Beryllium 0.55 mg/Kg 0.49
Chromium 61 mg/Kg 0.98
Cobalt 17 mg/Kg 0.49
Copper 46 mg/Kg 0.98
Lead 9.3 mg/Kg 0.98
Nickel 70 mg/Kg 0.98
Vanadium 77 mg/Kg 0.98
Zinc 73 mg/Kg 4.9
Method: EPA 7471A
Prep Method: EPA 7471A
Mercury 0.22 mg/Kg 0.17
#
CCV drift outside limits; average CCV drift within limits per method requirements
C Presence confirmed, but RPD between columns exceeds 40% 8 of 8 v55.1
Detection Summary
Results for any subcontracted analyses are not included in this summary. Data qualifiers and additional information necessary for the interpretation of the test results are contained in the PDF file and may not be included in this summary. 11 of 98 HA .P

ANALYTICAL

Page 1502 of 1860 ends

12 of 98
Baseline Environmental Consulting
388 17th Street, Suite 230
Oakland, CA 94612
Tel: (510) 420-8686
Project Number 24201-01
Project Name: East County Service Center
Samplers: (Signature I
.

LAB
Sample ID Date Time Media NO.
8-9: 0.0-0.5 1/' l /25 7:f5 Soil
8-9: 1.5-2.0 1/ , /25 '1,! "-2 Soil
8-10: 0.0-0.5 1/ /25 q_ :21 Soil
8-10: 1.5-2.0 1/' /25 1 :1a Soil
8-11: 0.0-0.5 1/ 1/25 ! : "C Soil
B-11: 1.5-2.0 1/. ) /25 •: I Soil
8-12: 0.0-0.5 1/. /25 ;J.,t. Soil
8-12: 1.5-2.0 1/ ...,,12s • • ',Z,. Soil
COMP-5
COMP-6
Re~2she1J': {Sig"lat J1
P"r/io.r. ,
Relinquished by: {Signature)
Relinquished by: (Signature)

CHAIN OF CUSTODY RECORD
LAB LOGIN 5 lJ i_ f1
"' cu
..,
·o
Containers
cu Type Preservative Q, cu
.S
II ..
> ;::;- _g~ II > 00 ..c 00
1'
vi g .8 -~ g g i .. E 0 i5 cu <( C "' <( -' "' 0. Q0 0. ·;;; 8 !;! 1!, .: w c5w "' <( - 1 1 X X X 1 1 X
1 1 X X X 1 1 X 1 1 X X X
1 1 X
1 1 X X X
1 1 X
D0Li7oo(½) Receivf ) y: {Signature) !'7 ~-
D; ~ i7 ~ ~
Recr;fve/J by: (Signature)
Jt :a< £..----,
Date/Time Received by:('Slgnature)
Received at laboratory with intact Samples conditions Comments:
custody seal Upon Arrival:

Yes No NA Intact On Ice Cold
ECSC
_
Southem S011 COC Page I of I
0 N
;;; "' o'i 4i - a, :E!:l @ E "' -
.... ~@ N 00 .'.'.) <( ' <( 0 0. :c 0.
>~ 0. w I- -

X X X X X X
Date/Time
1,'8'.'J..')
JAN
Turn-Around-Time ..;S __ ta.;..n_d;.,;accr..;.d _________ _ Laboratory _E_n_th_a __ lp'-'y'-,----------
Baseline Contact Person Cem Atabek
Notes
COMP-5 COMP-6, Hold
COMP-5
COMP-6, Hold
COMP-5 COMP-6, Hold COMP-5
COMP-6, Hold
Remarks:
rs:~
0 9 20Z~
11, ;oo
Email contact:

[email protected]
[email protected]

Page 1503 of 1860 ends

13 of 98
Baseline Environmental Consulting
388 17th Street, Suite 230
Oakland, CA 94612
Tel: (510) 420-8686
Project Number 24201-01
Project Name: East County Service Center
Samplers: (Signature)
LAB
NO. Sample ID Date Time Media
B-13: 0.0-0.5 11' ,/25 ~2. 1 Soil
B-13: 1.5-2.0 l/"- , /25 ~';'L Soil
B-14: 0.0-0.5 11< \/25 " :s-a Soll
B-14: 1.S-2.0 11< /25 ~;oi..t Soll
B-15: 0.0-0.5 l/ Q../25 111 r5"{ Soll B-15: 1.5-2.0 1/{f' /25 In l!.t-1 Soll COMP-7
COMP-8
RizJP::natR -l/1 -
l\"elinquished by: (Signature)
Relinquished by: (Signature)
Containers
Type
:
vi 0 ] j 0.. g .!!. e C
_g
1 1 1 1 1 1
1 1
1 1 1 1
Date/Time l~: 10

CHAIN OF CUSTODY RECORD
',<..~
LAB LOGIN 5L15 'f-tr i-t
.,,
.,
-0
·o
;:;-
00 ., C.

Preservative .,
<I: C
UJ
Cl. 0<
- :c @ u .8 "i: g
0 5 "' <I: e!' c.. g z 8 :,: <I: 0 UJ

X X X X X X X

X X X X X
Recelv_1 'rJ!.: (Signature)_
0).._ /01> I ts rT"'-..~
Date/Time Rec<fve~ by:~
//shr /'5 .' o<:;'
Date/Time Received b ignature)
Received at laboratory with intact Samples conditions Comments:
custody seal Upon Arrival:

Yes No NA Intact On Ice Cold
ECSC_Southem_So,I COC Page I of I
Turn-Around-Time Standard
--------------
Laborat ory _E_n_th_a....: lp....:y _________ _
Baseline Contact Person Cem Atabek
0 ....
---
@ .,, ....
<I:
c.. co <I:
@ Cl. .,, UJ IQ N - Notes
.,
00 0
<I: E
Cl.

N UJ -0 N - oii ~ "' ., u •O :r; N .:; 0 i'.= > I=
COMP-7 COMP-8, Hold COMP-7 COMP-8, Hold
COMP-7
COMP-8, Hold
X X X
X X X
Date/Time Remarks:

1.io6 13'3(.b
-c JA N,7~.J 20 25
Email contact:

[email protected]
lnhnathanli1Jb><0 linP-Pnv.mm

Page 1504 of 1860 ends

14 of 98
Baseline Environmental Consulting
388 17th Street, Suite 230
Oakland, CA 94612
Tel: {510) 420-8686
Project Number 24201-01
Project Name: Ea~ Countv Service Center
!Samplers: {Signature)
LAB
NO. Samo1e ID Date Time Media
8-16: 0.0-0.5 1/"- /25 tA:Z.'1 Soil
8-16: 1.5-2.0 11"/2 /25 !f!:12 Soll
8-17: 0.0-0.S 1/ '1l25 \~ (,,, Soll
8-17: 1.5-2.0 1/ \ /25 11 :1 _,, Soll
8-18: 0.0-0.S 1/~ ,,.f25 If :·•) I Soil
8-18: 1.5-2.0 1/ l /25 II ,-lJq Soil
COMP-9
COMP-10
Relinqu~shed b . (Signature)
fa 1;1v ~':°"~'
Relinqul~
Relinquished by: (Signature)
Containers
Type
] ;;; g .!!. c e
,g :ij
1 1 1 1 1 1 1 1 1 1
1 1

CHAIN OF CUSTODY RECORD
~Y"I
LAB LOGIN 2_Z.J54t '(1
VI
.,
-0
·;:;
-;::.- "ti
00 ., @ a. Preservative .,
< C:

0.. 'C -
uJ 0 <
- :2 &1 u .8 ·c:: g@ E 0 0 5 .. "'< 0..
3 ....
8 !;i 1 < 0 !::'.

X X X X X X X X X X X X
Date/Time /p· ~o Received by:.zx.ature) cJ:1/Po /,1. c; Date/Time Receivedb~
-
I ICJ/1;-r;- tiff;. <J"':(
Date/Time Received~ignature)
Received at laboratory with intact Samples conditions Comments:
custody seal Upon Arrival:

Yes No NA Intact On Ice Cold
ECSC _ South cm_ So, I COC Page I of I
Turn-Around-Time _S_ta_n...;d...;a_rd.;._ _________ _
Laboratory _E_n_th_a__, IP__,Y ___ ______ _
Baseline
-
Contact -------- Person -- - - Cem --
...

Atabek ··-----
0 .......
,..;
@ "' ,..;
< @ 0..
uJ iii" <
- @ 0.. VI uJ
N - Notes
., 00 0 < E 0..

N !::'. -0 N oo-
., i'.l ,o IN 0
> I= @
COMP-9 COMP-10, Hold COMP-9 COMP-10, Hold COMP-9 COMP-10, Hold

X X X X X X
Date/Time Remarks:
1i~5 1~:n
JA~,,
I Email contact:
[email protected]
Jnhnathan®horeline-Pnv.rnm

Page 1505 of 1860 ends

15 of 98

SAMPLE RECEIPT CHECKLIST
Section 1: General Info :~
Date Received: IL 'f..t.tJ WO# 12J 1 vei Client: Rtr L-/;/lG l NI ltALl'Y Section 2: Shipping/ Custody Are custody seals present? □ Yes )a'No Custody seals intact on arrival? f2JN/A D Yes 0 No D On cooler/ box D On samples Shipping Info:

Section 3a: Condition/ Packaging' D Outside 0.0 - 6.0'C (O.O - 10.0'C for microbiology) (PM notified) Date Opened it rus By (initials) I< H L-t Type of ice used : ,El'wet 0 Blue/Gel D None .121Samples received on ice directly from the field; cooling process had begun. (if checked, skip temperatures) D Sample matrix doesn't require cooling (e.g. air, bulk PCB). (if checked, skip temperatures) If no cooler: Observed/Adjusted Temp ('C): I Thermometer/lR Gun: CF:

Cooler Temp ('C) #1:_j __ #2:_j __ #3:_j __ #4:_j __ #5:_j __ #6:_j __ Section 3b: Microbiology Samples ~ No microbiology samples submitted (skip 3b) D Within temp range 0.0 - 10.0'C or received on ice directly from field.

D Adequate headspace for microbiology analysis.

Section 3c: Air Samples ,P"No air samples submitted (skip 3c) D l.4L Canisters D GL Canisters D Tedlar Bags D MCE Cassettes □ Sorbent Tubes □ Other Section 4: Containers/ Labels / Samples YES NO N/A
1) Were custody papers present, filled properly, and legible? / 2) Is the sampler's name present on the CoC? /
3) Were containers received in good condition (unbroken/ unopened / uncompromised)? / 4) Were the samples bagged? (required for microbiology samples; recommended for soil samples) / 5) Were all of, and only, the correct samples received? / 6) Are sample labels present, legible, and in agreement with the CoC? ~ 7) Does the container count match the Coe? /
8) Was sufficient sample volume/ mass received for the analyses requested? / 9) Were samples received in proper containers for the analyses requested? / 10) Were samples received with> 1/2 holding time remaining? / 11) Are samples properly preserved as indicated by Coe/ labels? / 12) Unpreserved VOAs received - If necessary, was the hold time changed in LIMS? V 13) Are VOA vials free from headspace/bubbles > 6mm? /
Section 5: Explanations/ Comments □ PM notified
Date Logged l /fU.J By (print) ~!I.lo\~+"' H3.~ (sign) -"2 2 /:, - Date Labeled ILUZ.5.. By (print) k{flll,d f~ FC~ (sign) ~ ;7,,..k . 1 Enthalpy Analytical J-0006, Rev 2: Form Version 16.1 081224

Page 1506 of 1860 ends

16 of 98
Sectio
Date Received:
n 1: Gene
1 ra
/9
l Info
/25 wott523589

SAMPLE RECEIPT
Client:

CHEC
Baseline
KLI
E
S
nvironmental
T
l
~ :N I I IAU' Y
Section 2: Shipping / Custody Are custody seals present?~ Yes No Cust ody seals intact on arrival? O N/A 121Yes No 121 On cooler/ box □ On samples Shipping Info:

Section 3a: Condition/ Packaging □ Outside 0.0 - 6.0°C (0.0 - 10.0°C for microbiology) (PM notified) Date Opened 1 /9/25 By (initials) (2CK- Type of ice used : 0Wet □ Blue/Gel None □ Samples received on ice directly from the field; cooling process had begun. (if checked, skip temperatures) □ Sample matrix doesn't require cooling (e.g. air, bulk PCB). (if checked, skip temperatures) If no cooler: Observed/Adjusted Temp (
0 C): I Thermometer/lR Gun: -m . .12.. CF: -t-D. ·2.

Cooler Temp (
0 C) #1:~ 2 ·3. #2:__j __ #3:__j __ #4:__j __ #5:__j __ #6:__j __ Section 3b: M icrobiology Samples Ii No microbiology samples submitted (skip 3b) □ Within temp range 0.0 - 10.o•c or received on ice directly from field. □ Adequate headspace for microbiology analysis.

Section 3c: Air Samples Ii No air samples submitted (skip 3c) O1.4L Canisters D 6L Canisters 0Tedlar Bags D MCE Cassettes 0 Sorbent Tubes 0 Other Section 4: Containers / Labels / Samples YES NO N/A
1) Were custody papers present, filled properly, and legible? X I 2) Is the sampler's name present on the CoC7 X 3) Were containers received in good condition (unbroken/ unopened/ uncompromised)7 X 4) Were the samples bagged? (required for microbiology samples; recommended for soil samples) X S) Were all of, and only, the correct samples received? X 6) Are sample labels present, legible, and in agreement with the CoC? X 7) Does the container count match the CoC? X
8) Was sufficient sample volume/ mass received for the analyses requested? X 9) Were samples received in proper containers for the analyses requested? X 10) Were samples received with > 1/2 holding time remaining? X 11) Are samples properly preserved as indicated by Coe/ labels? X 12)
13) Are
Unpreserved
VOA vials
VOAs
free from
received
headspace/bubbles
- If necessary, was
> Gmm?
the hold time changed in LIMS? ~ X
Section 5: Explanations / Comments D PM notified
Date Logged 1 /8/25 By (print) KHH (sign)
Date Labeled 1/8/25 By (print) KHH (sign)
Enthalpy Analytical J-0006, Rev 2: Form Version 16.1 081224

Page 1507 of 1860 ends

17 of 98

SOUTHWEST AIRLINES
~26:'~0AK 2236 7564 f +t~
OAK WN 1198 09 JAN 07:10
-XJ:l
•.-. • &. I • PC ID: 0001
..._ __ .._ PC WT: 39LB
526 22367564 0001
-......
-,,
0 0
"T1 ::ii::

Cl
. c.n - c:, rw c.n .....
,._ r- == .e cc, .....

Page 1508 of 1860 ends

18 of 98
526 I OAK 122367564 526 - 22367564
Shipper's Name and Address I Shippe(s Account Number Not Negotiable/ Issued by ENTHALPY ANALYTICAL, LLC 103977 - 1
1111111111111
931 W BARKLEY AVE Southwest".

ORANGE, CA 92868
us +1 (714) 771-6900 Cargo 52622367564
swacargo.com (800) 533-1222
Copies 1, 2 and 3 of this Air Waybill are originals and have the same validity.

Consignee·s Name and Address I Consignee's Account Number n is agreed that the goods described herein are accepted In apparent good order and oonddion {except as noted) for carriage subj ct to Southw.st Alr11nes' Contract of Carriage which is www swacargo com and ENTHALPY ANALYTICAL, LLC 103977 - 1 any tocatlon where air wayblUs are available. Shlppt:r's attention is drawn to the terms of the contract 931 W BARKLEY AVE which includes, among oth.r things; (1) Limits on Curlers· liability for loss, damage, or delay of ORANGE, CA 92868 goods, Including fragile or perishable goods; (2) Clalm restrictions, Including time within which shippers or consignees mu1t flle a claim or bring an action again.st the earri« for Its ac11 or omi11lon1 us +1 (714) 771-6900 or those of Its agents: (3) Right of the carrier to change the terms of the contract; (4) Rules about refusal to carry; and (5) Rights of the carrfer •nd limitations. concerning delay or fallute to perform service, Including schedule changes, rerouting, substitution of an alternate curler or aircraft, or meant of carriage lncfudlng road un~•• specmc contrary Instructions are given hereon by :shipper, and shipper agrH1 the shipment may be carried via Intermediate stopping places the carrier deems Issuing Carrier's Agent Name and City appropriate. Shipper may increase liability limits by declaring a higher value for r.2:rriage and paying a supplemental charge if required.

Accounting lnfonnation Service Level - S
Agent's IATA Code I Account No. Billed on 01/08/2025 19:42 PS'l' $WA- ACCOUNT 103977 Airport of Departure (Addr. of First Carrier) and Requested Routing

OAKLAND
~---- To I By First Carrier I To I By I To
I
By Currency I cHGS I WT.VAL I Othef IDedared Value for Carriage,! Declared Value for Customs Code I PPO COll , PPD I COLL I

SNA SOUTHWEST AIRLINES USD PP X X NVD
Airport of Destination !
Flight Date"-. For Carrier Use Only/ Flight Date Amount of Insurance INSURANCE - If carrier offers insurance, and such insurance is WN1198 I 09JAN I - requested In accordance with the conditions thereof, indicate amount SNA - _ t!l..b!I insured in fi91Jresj n box marked "Amount of Insurance·.

HANDLING INFORMATION -
I SCI
No.of Gross kg Rate Class Chargeable R/4te Total Nature and Quantity of Goods Pieces Weight lb <.;ommoaity Weight (Inc. Dimensions or Volume) RCP Item No. Charge
4 155 L N 0000 155 As Agreed ••••1ttll'W SOIL/WATER/AIR SAMPLES DIMS IN INCHES:
1=24X 15X14 1 = 20 X 13 X 16
2 = 18 X 18 X 13
4 155 •·•·····
"' Prepaid / , WeiQht CharQe / , Collect / Other Charges and Description MYC 0.00 SCC0.00
"\. Valuation Charge /
- "\. Tax /
'-Total Other Charges Due Agent/ Shipper certifies that the particulars on the face hereof are correct and that Insofar as any part of the consignment contains dangerous goods, such part is properly described by name and is in proper condition for carriage by air according to the applicable Dangerous Goods Regulations. I consent that '\ Total Other Charges Due Carrier / this shipment shall be subject to search by the Carrier.

ANAYANCI ORTEGA GALLEGOS
....... - ------------ - - - --- - -- ------- Signature of Shipper or his Agent "\. Total Prepaid / "\. Total Collect /
'\Currency Conversion Rate,V l"\.CC Charges in Dest.Currency/ 01/08/2025 19:42 PST OAK E79696 ------- - ----- - - - - - -- - - ------- Executed on (date and time) At (place) Signature of Issuing Carrier or its Agent For Carriers Use only "\. Charqes at Destination / "\. Total Collect Charges / I 526 - 22367564 at Destination ORIGINAL 2 Page 1509 of 1860
19 of 98
1/16/25, 2:24 PM Mail - Miguel Gamboa - Outlook
• Outlook
[External] - Re: 24201-01 - Enthalpy Data (523589)
From Cem Atabek <[email protected]>
Date Thu 1/16/2025 2:10 PM
To Miguel Gamboa <[email protected]>
Cc Johnathan Rizzo-Mosbaugh <[email protected]> Hi Miguel, please analyze all discrete samples that were placed on hold for OCPs, and analyze all of the composite samples for soluble chromium by WET.

Thanks,
-Cem
Cem Atabek
Baseline Environmental Consulting
388 17th Street, Suite 230
Oakland, CA 94612
Direct: .(510) 588-7022
Cell: .(510) 541-7879
Mail: PO Box 18586, Oakland, CA 94619
On Thu, Jan 16, 2025 at 1 :44 PM Miguel Gamboa < miguel.gamboa@enthalP-,Y..com > wrote:

HiCem,
Please find attached the following files:
• PDF Deliverable
• Standard format + MDL EDD (523589_standard-mdl.zip)
Email was also sent to: [email protected]
Miguel Gamboa
Project Manager
Enthalpy Analytical, LLC
2323 Fifth St., Berkeley, CA 94710
(510) 204-2236
Miguel.Gamboa@enthalP-,Y..com
https://outlook.office365.com/mail/inbox/id/AAQkAGl5NWQwOWQ5LWMyMDltNDY5Ny1hZDQ1LTRjYjhjODljNjAzMgAQAAmhKw7yb89DpAtDg7iiTdk... 1/2

Page 1510 of 1860 ends

Field ID: COMP-5 DF: 0.9995 Analyzed: 01/10/25
Type: SAMPLE Batch#: 359953 Prep: EPA 3580M
Lab ID: 523589-009 Sampled: 01/08/25 Analysis: EPA 8015M Matrix: Soil Received: 01/08/25 Analyst: DIB
Basis: as received Prepared: 01/10/25
523589-009 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
523589-009 Surrogate %REC Limits
n-Triacontane 82 70-130
Field ID: COMP-6 DF: 0.9985 Analyzed: 01/10/25
Type: SAMPLE Batch#: 359953 Prep: EPA 3580M
Lab ID: 523589-010 Sampled: 01/08/25 Analysis: EPA 8015M Matrix: Soil Received: 01/08/25 Analyst: DIB
Basis: as received Prepared: 01/10/25
523589-010 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
523589-010 Surrogate %REC Limits
n-Triacontane 82 70-130
Field ID: COMP-7 DF: 0.9930 Analyzed: 01/10/25
Type: SAMPLE Batch#: 359953 Prep: EPA 3580M
Lab ID: 523589-017 Sampled: 01/08/25 Analysis: EPA 8015M Matrix: Soil Received: 01/08/25 Analyst: DIB
Basis: as received Prepared: 01/10/25
523589-017 Analyte Result RL Units
GRO C8-C10 ND 9.9 mg/Kg
DRO C10-C28 ND 9.9 mg/Kg
ORO C28-C44 ND 20 mg/Kg
523589-017 Surrogate %REC Limits
n-Triacontane 84 70-130
1 of 3 v37
Extractable Carbon Chain
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 20 of 98
HA .P

ANALYTICAL

Page 1511 of 1860 ends

Field ID: COMP-8 DF: 0.9965 Analyzed: 01/10/25
Type: SAMPLE Batch#: 359953 Prep: EPA 3580M
Lab ID: 523589-018 Sampled: 01/08/25 Analysis: EPA 8015M Matrix: Soil Received: 01/08/25 Analyst: DIB
Basis: as received Prepared: 01/10/25
523589-018 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
523589-018 Surrogate %REC Limits
n-Triacontane 80 70-130
Field ID: COMP-9 DF: 0.9955 Analyzed: 01/10/25
Type: SAMPLE Batch#: 359953 Prep: EPA 3580M
Lab ID: 523589-025 Sampled: 01/08/25 Analysis: EPA 8015M Matrix: Soil Received: 01/08/25 Analyst: DIB
Basis: as received Prepared: 01/10/25
523589-025 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
523589-025 Surrogate %REC Limits
n-Triacontane 83 70-130
Field ID: COMP-10 DF: 0.9960 Analyzed: 01/10/25
Type: SAMPLE Batch#: 359953 Prep: EPA 3580M
Lab ID: 523589-026 Sampled: 01/08/25 Analysis: EPA 8015M Matrix: Soil Received: 01/08/25 Analyst: DIB
Basis: as received Prepared: 01/10/25
523589-026 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
523589-026 Surrogate %REC Limits
n-Triacontane 82 70-130
2 of 3 v37
Extractable Carbon Chain
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 21 of 98
HA .P

ANALYTICAL

Page 1512 of 1860 ends

Type: BLANK Batch#: 359953 Analysis: EPA 8015M
Lab ID: QC1218899 Prepared: 01/10/25 Analyst: DIB
Matrix: Soil Analyzed: 01/10/25
DF: 1.005 Prep: EPA 3580M
QC1218899 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
QC1218899 Surrogate %REC Limits
n-Triacontane 85 70-130
Legend
ND: Not Detected
RL: Reporting Limit
3 of 3 v37
Extractable Carbon Chain
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 22 of 98
HA .P

ANALYTICAL

Page 1513 of 1860 ends

Type: LCS Batch#: 359953 Analysis: EPA 8015M
Lab ID: QC1218900 Prepared: 01/10/25 Analyst: DIB
Matrix: Soil Analyzed: 01/10/25
DF: 1.000 Prep: EPA 3580M
QC1218900 Analyte Spiked Result %REC Limits Units
Diesel C10-C28 250.0 210.0 84 76-122 mg/Kg
QC1218900 Surrogate %REC Limits
n-Triacontane 81 70-130
1 of 1 v38
Extractable Carbon Chain: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 23 of 98
HA .P

ANALYTICAL

Page 1514 of 1860 ends

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 01/10/25 Type: MS DF: 0.9970 Analyzed: 01/10/25
MSS Lab ID: 523710-002 Batch#: 359953 Prep: EPA 3580M
Lab ID: QC1218901 Sampled: 01/09/25 Analysis: EPA 8015M Matrix: Soil Received: 01/09/25 Analyst: DIB
QC1218901 Analyte MSS Result Spiked Result %REC Limits Units Diesel C10-C28 199.4 249.3 393.1 78 62-126 mg/Kg
QC1218901 Surrogate %REC Limits
n-Triacontane 83 70-130
Field ID: ZZZZZZZZZZ Basis: as received Prepared: 01/10/25 Type: MSD DF: 0.9965 Analyzed: 01/10/25
MSS Lab ID: 523710-002 Batch#: 359953 Prep: EPA 3580M
Lab ID: QC1218902 Sampled: 01/09/25 Analysis: EPA 8015M Matrix: Soil Received: 01/09/25 Analyst: DIB
QC1218902 Analyte Spiked Result %REC Limits Units RPD Lim Diesel C10-C28 249.1 427.8 92 62-126 mg/Kg 8 35
QC1218902 Surrogate %REC Limits
n-Triacontane 81 70-130
Legend
RPD: Relative Percent
Difference
1 of 1 v39
Extractable Carbon Chain: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 24 of 98
HA .P

ANALYTICAL

Page 1515 of 1860 ends

Field ID: COMP-5 Batch#: 359956 Prep: EPA 5030B
Lab ID: 523589-009 Sampled: 01/08/25 Analysis: EPA 8260B Matrix: Soil Received: 01/08/25 Analyst: HMN
DF: 1.000 Analyzed: 01/10/25
523589-009 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v25
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 25 of 98
HA .P

ANALYTICAL

Page 1516 of 1860 ends

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
523589-009 Analyte Result RL Units Basis
523589-009 Surrogate %REC Limits Basis
Dibromofluoromethane 103 70-145 as received
1,2-Dichloroethane-d4 105 70-145 as received
Toluene-d8 100 70-145 as received
Bromofluorobenzene 96 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v25
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 26 of 98
HA .P

ANALYTICAL

Page 1517 of 1860 ends

Field ID: COMP-6 Batch#: 359956 Prep: EPA 5030B
Lab ID: 523589-010 Sampled: 01/08/25 Analysis: EPA 8260B Matrix: Soil Received: 01/08/25 Analyst: LYZ
DF: 1.000 Analyzed: 01/10/25
523589-010 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v26
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 27 of 98
HA .P

ANALYTICAL

Page 1518 of 1860 ends

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
523589-010 Analyte Result RL Units Basis
523589-010 Surrogate %REC Limits Basis
Dibromofluoromethane 87 70-145 as received
1,2-Dichloroethane-d4 84 70-145 as received
Toluene-d8 99 70-145 as received
Bromofluorobenzene 96 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v26
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 28 of 98
HA .P

ANALYTICAL

Page 1519 of 1860 ends

Field ID: COMP-7 Batch#: 359956 Prep: EPA 5030B
Lab ID: 523589-017 Sampled: 01/08/25 Analysis: EPA 8260B Matrix: Soil Received: 01/08/25 Analyst: LYZ
DF: 1.000 Analyzed: 01/10/25
523589-017 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v27
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 29 of 98
HA .P

ANALYTICAL

Page 1520 of 1860 ends

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
523589-017 Analyte Result RL Units Basis
523589-017 Surrogate %REC Limits Basis
Dibromofluoromethane 89 70-145 as received
1,2-Dichloroethane-d4 86 70-145 as received
Toluene-d8 98 70-145 as received
Bromofluorobenzene 97 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v27
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 30 of 98
HA .P

ANALYTICAL

Page 1521 of 1860 ends

Field ID: COMP-8 Batch#: 359956 Prep: EPA 5030B
Lab ID: 523589-018 Sampled: 01/08/25 Analysis: EPA 8260B Matrix: Soil Received: 01/08/25 Analyst: LYZ
DF: 1.000 Analyzed: 01/10/25
523589-018 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v28
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 31 of 98
HA .P

ANALYTICAL

Page 1522 of 1860 ends

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
523589-018 Analyte Result RL Units Basis
523589-018 Surrogate %REC Limits Basis
Dibromofluoromethane 86 70-145 as received
1,2-Dichloroethane-d4 84 70-145 as received
Toluene-d8 98 70-145 as received
Bromofluorobenzene 98 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v28
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 32 of 98
HA .P

ANALYTICAL

Page 1523 of 1860 ends

Field ID: COMP-9 Batch#: 359956 Prep: EPA 5030B
Lab ID: 523589-025 Sampled: 01/08/25 Analysis: EPA 8260B Matrix: Soil Received: 01/08/25 Analyst: LYZ
DF: 1.000 Analyzed: 01/10/25
523589-025 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v29
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 33 of 98
HA .P

ANALYTICAL

Page 1524 of 1860 ends

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
523589-025 Analyte Result RL Units Basis
523589-025 Surrogate %REC Limits Basis
Dibromofluoromethane 89 70-145 as received
1,2-Dichloroethane-d4 84 70-145 as received
Toluene-d8 99 70-145 as received
Bromofluorobenzene 96 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v29
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 34 of 98
HA .P

ANALYTICAL

Page 1525 of 1860 ends

Field ID: COMP-10 Batch#: 360021 Prep: EPA 5030B
Lab ID: 523589-026 Sampled: 01/08/25 Analysis: EPA 8260B Matrix: Soil Received: 01/08/25 Analyst: LYZ
DF: 1.000 Analyzed: 01/11/25
523589-026 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v30
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 35 of 98
HA .P

ANALYTICAL

Page 1526 of 1860 ends

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
523589-026 Analyte Result RL Units Basis
523589-026 Surrogate %REC Limits Basis
Dibromofluoromethane 87 70-145 as received
1,2-Dichloroethane-d4 78 70-145 as received
Toluene-d8 103 70-145 as received
Bromofluorobenzene 141 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v30
Purgeable Organics by GC/MS
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 36 of 98
HA .P

ANALYTICAL

Page 1527 of 1860 ends

Type: BS DF: 1.000 Prep: EPA 5030B
Lab ID: QC1218905 Batch#: 359956 Analysis: EPA 8260B
Matrix: Soil Analyzed: 01/10/25 Analyst: HMN
QC1218905 Analyte Spiked Result %REC Limits Units
1,1-Dichloroethene 50.00 55.50 111 70-131 ug/Kg
MTBE 50.00 54.29 109 69-130 ug/Kg
Benzene 50.00 54.70 109 70-130 ug/Kg
Trichloroethene 50.00 54.10 108 70-130 ug/Kg
Toluene 50.00 56.65 113 70-130 ug/Kg
Chlorobenzene 50.00 57.30 115 70-130 ug/Kg
QC1218905 Surrogate %REC Limits
Dibromofluoromethane 102 70-130
1,2-Dichloroethane-d4 101 70-145
Toluene-d8 104 70-145
Bromofluorobenzene 102 70-145
Type: BSD DF: 1.000 Prep: EPA 5030B
Lab ID: QC1218906 Batch#: 359956 Analysis: EPA 8260B
Matrix: Soil Analyzed: 01/10/25 Analyst: HMN
QC1218906 Analyte Spiked Result %REC Limits Units RPD Lim 1,1-Dichloroethene 50.00 51.53 103 70-131 ug/Kg 7 33
MTBE 50.00 50.80 102 69-130 ug/Kg 7 30
Benzene 50.00 51.04 102 70-130 ug/Kg 7 30
Trichloroethene 50.00 49.14 98 70-130 ug/Kg 10 30
Toluene 50.00 50.73 101 70-130 ug/Kg 11 30
Chlorobenzene 50.00 51.40 103 70-130 ug/Kg 11 30
QC1218906 Surrogate %REC Limits
Dibromofluoromethane 103 70-130
1,2-Dichloroethane-d4 101 70-145
Toluene-d8 101 70-145
Bromofluorobenzene 98 70-145
Legend
RPD: Relative Percent
Difference
1 of 1 v31
Purgeable Organics by GC/MS: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 37 of 98
HA .P

ANALYTICAL

Page 1528 of 1860 ends

Type: BLANK DF: 1.000 Prep: EPA 5030B
Lab ID: QC1218910 Batch#: 359956 Analysis: EPA 8260B
Matrix: Soil Analyzed: 01/10/25 Analyst: HMN
QC1218910 Analyte Result RL Units
Freon 12 ND 5.0 ug/Kg
Chloromethane ND 5.0 ug/Kg
Vinyl Chloride ND 5.0 ug/Kg
Bromomethane ND 5.0 ug/Kg
Chloroethane ND 5.0 ug/Kg
Trichlorofluoromethane ND 5.0 ug/Kg
Acetone ND 100 ug/Kg
Freon 113 ND 5.0 ug/Kg
1,1-Dichloroethene ND 5.0 ug/Kg
Methylene Chloride ND 20 ug/Kg
MTBE ND 5.0 ug/Kg
trans-1,2-Dichloroethene ND 5.0 ug/Kg
1,1-Dichloroethane ND 5.0 ug/Kg
2-Butanone ND 100 ug/Kg
cis-1,2-Dichloroethene ND 5.0 ug/Kg
2,2-Dichloropropane ND 5.0 ug/Kg
Chloroform ND 5.0 ug/Kg
Bromochloromethane ND 5.0 ug/Kg
1,1,1-Trichloroethane ND 5.0 ug/Kg
1,1-Dichloropropene ND 5.0 ug/Kg
Carbon Tetrachloride ND 5.0 ug/Kg
1,2-Dichloroethane ND 5.0 ug/Kg
Benzene ND 5.0 ug/Kg
Trichloroethene ND 5.0 ug/Kg
1,2-Dichloropropane ND 5.0 ug/Kg
Bromodichloromethane ND 5.0 ug/Kg
Dibromomethane ND 5.0 ug/Kg
4-Methyl-2-Pentanone ND 5.0 ug/Kg
cis-1,3-Dichloropropene ND 5.0 ug/Kg
Toluene ND 5.0 ug/Kg
trans-1,3-Dichloropropene ND 5.0 ug/Kg
1,1,2-Trichloroethane ND 5.0 ug/Kg
1,3-Dichloropropane ND 5.0 ug/Kg
Tetrachloroethene ND 5.0 ug/Kg
Dibromochloromethane ND 5.0 ug/Kg
1,2-Dibromoethane ND 5.0 ug/Kg
Chlorobenzene ND 5.0 ug/Kg
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg
Ethylbenzene ND 5.0 ug/Kg
m,p-Xylenes ND 10 ug/Kg
o-Xylene ND 5.0 ug/Kg
Styrene ND 5.0 ug/Kg
Bromoform ND 5.0 ug/Kg
Isopropylbenzene ND 5.0 ug/Kg
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg
1,2,3-Trichloropropane ND 5.0 ug/Kg
Propylbenzene ND 5.0 ug/Kg
Bromobenzene ND 5.0 ug/Kg
1 of 2 v32
Purgeable Organics by GC/MS: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 38 of 98
HA .P

ANALYTICAL

Page 1529 of 1860 ends

1,3,5-Trimethylbenzene ND 5.0 ug/Kg
2-Chlorotoluene ND 5.0 ug/Kg
4-Chlorotoluene ND 5.0 ug/Kg
tert-Butylbenzene ND 5.0 ug/Kg
1,2,4-Trimethylbenzene ND 5.0 ug/Kg
sec-Butylbenzene ND 5.0 ug/Kg
para-Isopropyl Toluene ND 5.0 ug/Kg
1,3-Dichlorobenzene ND 5.0 ug/Kg
1,4-Dichlorobenzene ND 5.0 ug/Kg
n-Butylbenzene ND 5.0 ug/Kg
1,2-Dichlorobenzene ND 5.0 ug/Kg
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg
1,2,4-Trichlorobenzene ND 5.0 ug/Kg
Hexachlorobutadiene ND 5.0 ug/Kg
Naphthalene ND 5.0 ug/Kg
1,2,3-Trichlorobenzene ND 5.0 ug/Kg
Xylene (total) ND 5.0 ug/Kg
QC1218910 Analyte Result RL Units
QC1218910 Surrogate %REC Limits
Dibromofluoromethane 104 70-130
1,2-Dichloroethane-d4 106 70-145
Toluene-d8 99 70-145
Bromofluorobenzene 96 70-145
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v32
Purgeable Organics by GC/MS: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 39 of 98
HA .P

ANALYTICAL

Page 1530 of 1860 ends

Field ID: COMP-5 Basis: as received Analyzed: 01/10/25
Type: MS DF: 1.000 Prep: EPA 5030B
MSS Lab ID: 523589-009 Batch#: 359956 Analysis: EPA 8260B Lab ID: QC1218935 Sampled: 01/08/25 Analyst: HMN
Matrix: Soil Received: 01/08/25
QC1218935 Analyte MSS Result Spiked Result %REC Limits Units 1,1-Dichloroethene <0.9491 50.00 38.07 76 70-141 ug/Kg
MTBE <0.6119 50.00 29.92 60 59-130 ug/Kg
Benzene <0.8085 50.00 36.18 72 70-130 ug/Kg
Trichloroethene <0.8705 50.00 34.89 70 69-130 ug/Kg
Toluene <0.9600 50.00 36.70 73 70-130 ug/Kg
Chlorobenzene <0.7500 50.00 34.69 69 * 70-130 ug/Kg
QC1218935 Surrogate %REC Limits
Dibromofluoromethane 103 70-145
1,2-Dichloroethane-d4 105 70-145
Toluene-d8 102 70-145
Bromofluorobenzene 102 70-145
Field ID: COMP-5 Basis: as received Analyzed: 01/10/25
Type: MSD DF: 1.000 Prep: EPA 5030B
MSS Lab ID: 523589-009 Batch#: 359956 Analysis: EPA 8260B Lab ID: QC1218936 Sampled: 01/08/25 Analyst: HMN
Matrix: Soil Received: 01/08/25
QC1218936 Analyte Spiked Result %REC Limits Units RPD Lim 1,1-Dichloroethene 50.00 39.29 79 70-141 ug/Kg 3 43
MTBE 50.00 37.67 75 59-130 ug/Kg 23 30
Benzene 50.00 39.06 78 70-130 ug/Kg 8 30
Trichloroethene 50.00 36.57 73 69-130 ug/Kg 5 30
Toluene 50.00 38.88 78 70-130 ug/Kg 6 30
Chlorobenzene 50.00 38.22 76 70-130 ug/Kg 10 30
QC1218936 Surrogate %REC Limits
Dibromofluoromethane 103 70-145
1,2-Dichloroethane-d4 104 70-145
Toluene-d8 101 70-145
Bromofluorobenzene 96 70-145
Legend
*: Value is outside QC limits
RPD: Relative Percent
Difference
1 of 1 v33
Purgeable Organics by GC/MS: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 40 of 98
HA .P

ANALYTICAL

Page 1531 of 1860 ends

Type: BS DF: 1.000 Prep: EPA 5030B
Lab ID: QC1219111 Batch#: 360021 Analysis: EPA 8260B
Matrix: Soil Analyzed: 01/10/25 Analyst: TCN
QC1219111 Analyte Spiked Result %REC Limits Units
1,1-Dichloroethene 50.00 44.06 88 70-131 ug/Kg
MTBE 50.00 42.20 84 69-130 ug/Kg
Benzene 50.00 44.98 90 70-130 ug/Kg
Trichloroethene 50.00 54.27 109 70-130 ug/Kg
Toluene 50.00 52.61 105 70-130 ug/Kg
Chlorobenzene 50.00 54.10 108 70-130 ug/Kg
QC1219111 Surrogate %REC Limits
Dibromofluoromethane 88 70-130
1,2-Dichloroethane-d4 82 70-145
Toluene-d8 99 70-145
Bromofluorobenzene 96 70-145
Type: BSD DF: 1.000 Prep: EPA 5030B
Lab ID: QC1219112 Batch#: 360021 Analysis: EPA 8260B
Matrix: Soil Analyzed: 01/10/25 Analyst: TCN
QC1219112 Analyte Spiked Result %REC Limits Units RPD Lim 1,1-Dichloroethene 50.00 39.79 80 70-131 ug/Kg 10 33
MTBE 50.00 38.15 76 69-130 ug/Kg 10 30
Benzene 50.00 40.75 82 70-130 ug/Kg 10 30
Trichloroethene 50.00 48.53 97 70-130 ug/Kg 11 30
Toluene 50.00 46.92 94 70-130 ug/Kg 11 30
Chlorobenzene 50.00 48.02 96 70-130 ug/Kg 12 30
QC1219112 Surrogate %REC Limits
Dibromofluoromethane 87 70-130
1,2-Dichloroethane-d4 80 70-145
Toluene-d8 98 70-145
Bromofluorobenzene 101 70-145
Legend
RPD: Relative Percent
Difference
1 of 1 v34
Purgeable Organics by GC/MS: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 41 of 98
HA .P

ANALYTICAL

Page 1532 of 1860 ends

Field ID: ZZZZZZZZZZ Basis: as received Analyzed: 01/10/25 Type: MS DF: 1.000 Prep: EPA 5030B
MSS Lab ID: 523710-001 Batch#: 360021 Analysis: EPA 8260B Lab ID: QC1219115 Sampled: 01/09/25 Analyst: TCN
Matrix: Soil Received: 01/09/25
QC1219115 Analyte MSS Result Spiked Result %REC Limits Units 1,1-Dichloroethene <0.9491 50.00 45.63 91 70-141 ug/Kg
MTBE <0.6119 50.00 36.00 72 59-130 ug/Kg
Benzene <0.8085 50.00 38.88 78 70-130 ug/Kg
Trichloroethene <0.8705 50.00 48.65 97 69-130 ug/Kg
Toluene <0.9600 50.00 47.88 96 70-130 ug/Kg
Chlorobenzene <0.7500 50.00 48.54 97 70-130 ug/Kg
QC1219115 Surrogate %REC Limits
Dibromofluoromethane 87 70-145
1,2-Dichloroethane-d4 82 70-145
Toluene-d8 102 70-145
Bromofluorobenzene 106 70-145
Field ID: ZZZZZZZZZZ Basis: as received Analyzed: 01/10/25 Type: MSD DF: 1.000 Prep: EPA 5030B
MSS Lab ID: 523710-001 Batch#: 360021 Analysis: EPA 8260B Lab ID: QC1219116 Sampled: 01/09/25 Analyst: TCN
Matrix: Soil Received: 01/09/25
QC1219116 Analyte Spiked Result %REC Limits Units RPD Lim 1,1-Dichloroethene 50.00 43.52 87 70-141 ug/Kg 5 43
MTBE 50.00 37.47 75 59-130 ug/Kg 4 30
Benzene 50.00 39.75 80 70-130 ug/Kg 2 30
Trichloroethene 50.00 48.41 97 69-130 ug/Kg 1 30
Toluene 50.00 47.20 94 70-130 ug/Kg 1 30
Chlorobenzene 50.00 48.66 97 70-130 ug/Kg 0 30
QC1219116 Surrogate %REC Limits
Dibromofluoromethane 88 70-145
1,2-Dichloroethane-d4 84 70-145
Toluene-d8 100 70-145
Bromofluorobenzene 107 70-145
Legend
RPD: Relative Percent
Difference
1 of 1 v35
Purgeable Organics by GC/MS: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 42 of 98
HA .P

ANALYTICAL

Page 1533 of 1860 ends

Type: BLANK DF: 1.000 Prep: EPA 5030B
Lab ID: QC1219118 Batch#: 360021 Analysis: EPA 8260B
Matrix: Soil Analyzed: 01/11/25 Analyst: TCN
QC1219118 Analyte Result RL Units
Freon 12 ND 5.0 ug/Kg
Chloromethane ND 5.0 ug/Kg
Vinyl Chloride ND 5.0 ug/Kg
Bromomethane ND 5.0 ug/Kg
Chloroethane ND 5.0 ug/Kg
Trichlorofluoromethane ND 5.0 ug/Kg
Acetone ND 100 ug/Kg
Freon 113 ND 5.0 ug/Kg
1,1-Dichloroethene ND 5.0 ug/Kg
Methylene Chloride ND 20 ug/Kg
MTBE ND 5.0 ug/Kg
trans-1,2-Dichloroethene ND 5.0 ug/Kg
1,1-Dichloroethane ND 5.0 ug/Kg
2-Butanone ND 100 ug/Kg
cis-1,2-Dichloroethene ND 5.0 ug/Kg
2,2-Dichloropropane ND 5.0 ug/Kg
Chloroform ND 5.0 ug/Kg
Bromochloromethane ND 5.0 ug/Kg
1,1,1-Trichloroethane ND 5.0 ug/Kg
1,1-Dichloropropene ND 5.0 ug/Kg
Carbon Tetrachloride ND 5.0 ug/Kg
1,2-Dichloroethane ND 5.0 ug/Kg
Benzene ND 5.0 ug/Kg
Trichloroethene ND 5.0 ug/Kg
1,2-Dichloropropane ND 5.0 ug/Kg
Bromodichloromethane ND 5.0 ug/Kg
Dibromomethane ND 5.0 ug/Kg
4-Methyl-2-Pentanone ND 5.0 ug/Kg
cis-1,3-Dichloropropene ND 5.0 ug/Kg
Toluene ND 5.0 ug/Kg
trans-1,3-Dichloropropene ND 5.0 ug/Kg
1,1,2-Trichloroethane ND 5.0 ug/Kg
1,3-Dichloropropane ND 5.0 ug/Kg
Tetrachloroethene ND 5.0 ug/Kg
Dibromochloromethane ND 5.0 ug/Kg
1,2-Dibromoethane ND 5.0 ug/Kg
Chlorobenzene ND 5.0 ug/Kg
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg
Ethylbenzene ND 5.0 ug/Kg
m,p-Xylenes ND 10 ug/Kg
o-Xylene ND 5.0 ug/Kg
Styrene ND 5.0 ug/Kg
Bromoform ND 5.0 ug/Kg
Isopropylbenzene ND 5.0 ug/Kg
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg
1,2,3-Trichloropropane ND 5.0 ug/Kg
Propylbenzene ND 5.0 ug/Kg
Bromobenzene ND 5.0 ug/Kg
1 of 2 v36
Purgeable Organics by GC/MS: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 43 of 98
HA .P

ANALYTICAL

Page 1534 of 1860 ends

1,3,5-Trimethylbenzene ND 5.0 ug/Kg
2-Chlorotoluene ND 5.0 ug/Kg
4-Chlorotoluene ND 5.0 ug/Kg
tert-Butylbenzene ND 5.0 ug/Kg
1,2,4-Trimethylbenzene ND 5.0 ug/Kg
sec-Butylbenzene ND 5.0 ug/Kg
para-Isopropyl Toluene ND 5.0 ug/Kg
1,3-Dichlorobenzene ND 5.0 ug/Kg
1,4-Dichlorobenzene ND 5.0 ug/Kg
n-Butylbenzene ND 5.0 ug/Kg
1,2-Dichlorobenzene ND 5.0 ug/Kg
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg
1,2,4-Trichlorobenzene ND 5.0 ug/Kg
Hexachlorobutadiene ND 5.0 ug/Kg
Naphthalene ND 5.0 ug/Kg
1,2,3-Trichlorobenzene ND 5.0 ug/Kg
Xylene (total) ND 5.0 ug/Kg
QC1219118 Analyte Result RL Units
QC1219118 Surrogate %REC Limits
Dibromofluoromethane 96 70-130
1,2-Dichloroethane-d4 89 70-145
Toluene-d8 101 70-145
Bromofluorobenzene 110 70-145
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v36
Purgeable Organics by GC/MS: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 44 of 98
HA .P

ANALYTICAL

Page 1535 of 1860 ends

Field ID: B-9:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-001 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-001 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 5.1 ug/Kg 1.010 01/14/25
beta-BHC ND 5.1 ug/Kg 1.010 01/14/25
gamma-BHC ND 5.1 ug/Kg 1.010 01/14/25
delta-BHC ND 5.1 ug/Kg 1.010 01/14/25
Heptachlor ND 5.1 ug/Kg 1.010 01/14/25
Aldrin ND 5.1 ug/Kg 1.010 01/14/25
Heptachlor epoxide ND 5.1 ug/Kg 1.010 01/14/25
Endosulfan I ND 5.1 ug/Kg 1.010 01/14/25
Dieldrin ND 5.1 ug/Kg 1.010 01/14/25
4,4'-DDE 780 51 ug/Kg 10.10 01/15/25
Endrin ND 5.1 ug/Kg 1.010 01/14/25
Endosulfan II ND 5.1 ug/Kg 1.010 01/14/25
Endosulfan sulfate ND 5.1 ug/Kg 1.010 01/14/25
4,4'-DDD 11 5.1 ug/Kg 1.010 01/14/25 # C
Endrin aldehyde ND 5.1 ug/Kg 1.010 01/14/25
Endrin ketone ND 5.1 ug/Kg 1.010 01/14/25
4,4'-DDT 210 5.1 ug/Kg 1.010 01/14/25
Methoxychlor ND 10 ug/Kg 1.010 01/14/25
Toxaphene ND 100 ug/Kg 1.010 01/14/25
Chlordane (Technical) ND 51 ug/Kg 1.010 01/14/25
523589-001 Surrogate %REC Limits DF Analyzed
TCMX 62 23-120 1.010 01/14/25
Decachlorobiphenyl 61 24-120 1.010 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v40.001
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 45 of 98
HA .P

ANALYTICAL

Page 1536 of 1860 ends

Field ID: B-9:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-002 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9814 Analyzed: 01/19/25
523589-002 Analyte Result RL Units
alpha-BHC ND 4.9 ug/Kg
beta-BHC ND 4.9 ug/Kg
gamma-BHC ND 4.9 ug/Kg
delta-BHC ND 4.9 ug/Kg
Heptachlor ND 4.9 ug/Kg
Aldrin ND 4.9 ug/Kg
Heptachlor epoxide ND 4.9 ug/Kg
Endosulfan I ND 4.9 ug/Kg
Dieldrin ND 4.9 ug/Kg
4,4'-DDE 14 4.9 ug/Kg
Endrin ND 4.9 ug/Kg
Endosulfan II ND 4.9 ug/Kg
Endosulfan sulfate ND 4.9 ug/Kg
4,4'-DDD ND 4.9 ug/Kg
Endrin aldehyde ND 4.9 ug/Kg
Endrin ketone ND 4.9 ug/Kg
4,4'-DDT ND 4.9 ug/Kg
Methoxychlor ND 9.8 ug/Kg
Toxaphene ND 98 ug/Kg
Chlordane (Technical) ND 49 ug/Kg
523589-002 Surrogate %REC Limits
TCMX 61 23-120
Decachlorobiphenyl 69 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v58
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 46 of 98
HA .P

ANALYTICAL

Page 1537 of 1860 ends

Field ID: B-10:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-003 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-003 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 4.9 ug/Kg 0.9804 01/14/25
beta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
gamma-BHC ND 4.9 ug/Kg 0.9804 01/14/25
delta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor ND 4.9 ug/Kg 0.9804 01/14/25
Aldrin ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor epoxide ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan I ND 4.9 ug/Kg 0.9804 01/14/25
Dieldrin ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDE 990 49 ug/Kg 9.804 01/15/25
Endrin ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan II ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan sulfate ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDD 15 4.9 ug/Kg 0.9804 01/14/25 # C
Endrin aldehyde ND 5.3 ug/Kg 0.9804 01/14/25
Endrin ketone ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDT 250 4.9 ug/Kg 0.9804 01/14/25
Methoxychlor ND 9.8 ug/Kg 0.9804 01/14/25
Toxaphene ND 98 ug/Kg 0.9804 01/14/25
Chlordane (Technical) ND 49 ug/Kg 0.9804 01/14/25
523589-003 Surrogate %REC Limits DF Analyzed
TCMX 73 23-120 0.9804 01/14/25
Decachlorobiphenyl 76 24-120 0.9804 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v41.001
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 47 of 98
HA .P

ANALYTICAL

Page 1538 of 1860 ends

Field ID: B-10:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-004 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9833 Analyzed: 01/19/25
523589-004 Analyte Result RL Units
alpha-BHC ND 4.9 ug/Kg
beta-BHC ND 4.9 ug/Kg
gamma-BHC ND 4.9 ug/Kg
delta-BHC ND 4.9 ug/Kg
Heptachlor ND 4.9 ug/Kg
Aldrin ND 4.9 ug/Kg
Heptachlor epoxide ND 4.9 ug/Kg
Endosulfan I ND 4.9 ug/Kg
Dieldrin ND 4.9 ug/Kg
4,4'-DDE 7.1 4.9 ug/Kg
Endrin ND 4.9 ug/Kg
Endosulfan II ND 4.9 ug/Kg
Endosulfan sulfate ND 4.9 ug/Kg
4,4'-DDD ND 4.9 ug/Kg
Endrin aldehyde ND 4.9 ug/Kg
Endrin ketone ND 4.9 ug/Kg
4,4'-DDT ND 4.9 ug/Kg
Methoxychlor ND 9.8 ug/Kg
Toxaphene ND 98 ug/Kg
Chlordane (Technical) ND 49 ug/Kg
523589-004 Surrogate %REC Limits
TCMX 55 23-120
Decachlorobiphenyl 62 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v59
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 48 of 98
HA .P

ANALYTICAL

Page 1539 of 1860 ends

Field ID: B-11:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-005 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-005 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 4.9 ug/Kg 0.9804 01/14/25
beta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
gamma-BHC ND 4.9 ug/Kg 0.9804 01/14/25
delta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor ND 4.9 ug/Kg 0.9804 01/14/25
Aldrin ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor epoxide ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan I ND 4.9 ug/Kg 0.9804 01/14/25
Dieldrin 12 4.9 ug/Kg 0.9804 01/14/25 C
4,4'-DDE 1,100 49 ug/Kg 9.804 01/15/25
Endrin ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan II ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan sulfate ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDD 17 4.9 ug/Kg 0.9804 01/14/25 # C
Endrin aldehyde ND 4.9 ug/Kg 0.9804 01/14/25
Endrin ketone ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDT 310 49 ug/Kg 9.804 01/15/25
Methoxychlor ND 9.8 ug/Kg 0.9804 01/14/25
Toxaphene ND 98 ug/Kg 0.9804 01/14/25
Chlordane (Technical) ND 49 ug/Kg 0.9804 01/14/25
523589-005 Surrogate %REC Limits DF Analyzed
TCMX 68 23-120 0.9804 01/14/25
Decachlorobiphenyl 83 24-120 0.9804 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v42
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 49 of 98
HA .P

ANALYTICAL

Page 1540 of 1860 ends

Field ID: B-11:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-006 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9930 Analyzed: 01/19/25
523589-006 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 21 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT 5.9 5.0 ug/Kg
Methoxychlor ND 9.9 ug/Kg
Toxaphene ND 99 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
523589-006 Surrogate %REC Limits
TCMX 56 23-120
Decachlorobiphenyl 62 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v60
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 50 of 98
HA .P

ANALYTICAL

Page 1541 of 1860 ends

Field ID: B-12:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-007 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-007 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 5.1 ug/Kg 1.020 01/14/25
beta-BHC ND 5.1 ug/Kg 1.020 01/14/25
gamma-BHC ND 5.1 ug/Kg 1.020 01/14/25
delta-BHC ND 5.1 ug/Kg 1.020 01/14/25
Heptachlor ND 5.1 ug/Kg 1.020 01/14/25
Aldrin ND 5.1 ug/Kg 1.020 01/14/25
Heptachlor epoxide ND 5.1 ug/Kg 1.020 01/14/25
Endosulfan I ND 5.1 ug/Kg 1.020 01/14/25
Dieldrin 7.0 5.1 ug/Kg 1.020 01/14/25 C
4,4'-DDE 780 51 ug/Kg 10.20 01/15/25
Endrin ND 5.1 ug/Kg 1.020 01/14/25
Endosulfan II ND 5.1 ug/Kg 1.020 01/14/25
Endosulfan sulfate ND 5.1 ug/Kg 1.020 01/14/25
4,4'-DDD 16 5.1 ug/Kg 1.020 01/14/25 # C
Endrin aldehyde ND 5.1 ug/Kg 1.020 01/14/25
Endrin ketone ND 5.1 ug/Kg 1.020 01/14/25
4,4'-DDT 230 5.1 ug/Kg 1.020 01/14/25
Methoxychlor ND 10 ug/Kg 1.020 01/14/25
Toxaphene ND 100 ug/Kg 1.020 01/14/25
Chlordane (Technical) ND 51 ug/Kg 1.020 01/14/25
523589-007 Surrogate %REC Limits DF Analyzed
TCMX 74 23-120 1.020 01/14/25
Decachlorobiphenyl 85 24-120 1.020 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v43
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 51 of 98
HA .P

ANALYTICAL

Page 1542 of 1860 ends

Field ID: B-12:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-008 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9980 Analyzed: 01/19/25
523589-008 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 9.7 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
523589-008 Surrogate %REC Limits
TCMX 55 23-120
Decachlorobiphenyl 59 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v61
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 52 of 98
HA .P

ANALYTICAL

Page 1543 of 1860 ends

Field ID: B-13:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-011 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-011 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 4.9 ug/Kg 0.9804 01/14/25
beta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
gamma-BHC ND 4.9 ug/Kg 0.9804 01/14/25
delta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor ND 4.9 ug/Kg 0.9804 01/14/25
Aldrin ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor epoxide ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan I ND 4.9 ug/Kg 0.9804 01/14/25
Dieldrin 8.8 4.9 ug/Kg 0.9804 01/14/25 C
4,4'-DDE 1,200 49 ug/Kg 9.804 01/15/25
Endrin ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan II ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan sulfate ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDD 18 4.9 ug/Kg 0.9804 01/14/25 # C
Endrin aldehyde ND 4.9 ug/Kg 0.9804 01/14/25
Endrin ketone ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDT 330 49 ug/Kg 9.804 01/15/25
Methoxychlor ND 9.8 ug/Kg 0.9804 01/14/25
Toxaphene ND 98 ug/Kg 0.9804 01/14/25
Chlordane (Technical) ND 49 ug/Kg 0.9804 01/14/25
523589-011 Surrogate %REC Limits DF Analyzed
TCMX 73 23-120 0.9804 01/14/25
Decachlorobiphenyl 92 24-120 0.9804 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v44
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 53 of 98
HA .P

ANALYTICAL

Page 1544 of 1860 ends

Field ID: B-13:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-012 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9970 Analyzed: 01/19/25
523589-012 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 68 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT 8.1 5.0 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
523589-012 Surrogate %REC Limits
TCMX 53 23-120
Decachlorobiphenyl 58 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v62
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 54 of 98
HA .P

ANALYTICAL

Page 1545 of 1860 ends

Field ID: B-14:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-013 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-013 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 4.9 ug/Kg 0.9804 01/14/25
beta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
gamma-BHC ND 4.9 ug/Kg 0.9804 01/14/25
delta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor ND 4.9 ug/Kg 0.9804 01/14/25
Aldrin ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor epoxide ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan I ND 4.9 ug/Kg 0.9804 01/14/25
Dieldrin 6.5 4.9 ug/Kg 0.9804 01/14/25 C
4,4'-DDE 870 49 ug/Kg 9.804 01/15/25
Endrin ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan II ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan sulfate ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDD 15 4.9 ug/Kg 0.9804 01/14/25 # C
Endrin aldehyde ND 4.9 ug/Kg 0.9804 01/14/25
Endrin ketone ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDT 270 4.9 ug/Kg 0.9804 01/14/25
Methoxychlor ND 9.8 ug/Kg 0.9804 01/14/25
Toxaphene ND 98 ug/Kg 0.9804 01/14/25
Chlordane (Technical) ND 49 ug/Kg 0.9804 01/14/25
523589-013 Surrogate %REC Limits DF Analyzed
TCMX 75 23-120 0.9804 01/14/25
Decachlorobiphenyl 88 24-120 0.9804 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v45
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 55 of 98
HA .P

ANALYTICAL

Page 1546 of 1860 ends

Field ID: B-14:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-014 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9930 Analyzed: 01/19/25
523589-014 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 32 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 9.9 ug/Kg
Toxaphene ND 99 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
523589-014 Surrogate %REC Limits
TCMX 50 23-120
Decachlorobiphenyl 52 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v63
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 56 of 98
HA .P

ANALYTICAL

Page 1547 of 1860 ends

Field ID: B-15:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-015 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-015 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 5.0 ug/Kg 1.000 01/14/25
beta-BHC ND 5.0 ug/Kg 1.000 01/14/25
gamma-BHC ND 5.0 ug/Kg 1.000 01/14/25
delta-BHC ND 5.0 ug/Kg 1.000 01/14/25
Heptachlor ND 5.0 ug/Kg 1.000 01/14/25
Aldrin ND 5.0 ug/Kg 1.000 01/14/25
Heptachlor epoxide ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan I ND 5.0 ug/Kg 1.000 01/14/25
Dieldrin 8.7 5.0 ug/Kg 1.000 01/14/25 C
4,4'-DDE 1,100 50 ug/Kg 10.00 01/15/25
Endrin ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan II ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan sulfate ND 5.0 ug/Kg 1.000 01/14/25
4,4'-DDD 22 5.0 ug/Kg 1.000 01/14/25 # C
Endrin aldehyde ND 5.0 ug/Kg 1.000 01/14/25
Endrin ketone ND 5.0 ug/Kg 1.000 01/14/25
4,4'-DDT 400 50 ug/Kg 10.00 01/15/25
Methoxychlor ND 10 ug/Kg 1.000 01/14/25
Toxaphene ND 100 ug/Kg 1.000 01/14/25
Chlordane (Technical) ND 50 ug/Kg 1.000 01/14/25
523589-015 Surrogate %REC Limits DF Analyzed
TCMX 67 23-120 1.000 01/14/25
Decachlorobiphenyl 79 24-120 1.000 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v46
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 57 of 98
HA .P

ANALYTICAL

Page 1548 of 1860 ends

Field ID: B-15:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-016 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9990 Analyzed: 01/19/25
523589-016 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 20 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
523589-016 Surrogate %REC Limits
TCMX 53 23-120
Decachlorobiphenyl 55 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v64
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 58 of 98
HA .P

ANALYTICAL

Page 1549 of 1860 ends

Field ID: B-16:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-019 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/13/25
523589-019 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 5.0 ug/Kg 1.000 01/14/25
beta-BHC ND 5.0 ug/Kg 1.000 01/14/25
gamma-BHC ND 5.0 ug/Kg 1.000 01/14/25
delta-BHC ND 5.0 ug/Kg 1.000 01/14/25
Heptachlor ND 5.0 ug/Kg 1.000 01/14/25
Aldrin ND 5.0 ug/Kg 1.000 01/14/25
Heptachlor epoxide ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan I ND 5.0 ug/Kg 1.000 01/14/25
Dieldrin 8.0 5.0 ug/Kg 1.000 01/14/25 C
4,4'-DDE 960 50 ug/Kg 10.00 01/15/25
Endrin ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan II ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan sulfate ND 5.0 ug/Kg 1.000 01/14/25
4,4'-DDD 18 5.0 ug/Kg 1.000 01/14/25 # C
Endrin aldehyde ND 5.0 ug/Kg 1.000 01/14/25
Endrin ketone ND 5.0 ug/Kg 1.000 01/14/25
4,4'-DDT 280 50 ug/Kg 10.00 01/15/25
Methoxychlor ND 10 ug/Kg 1.000 01/14/25
Toxaphene ND 100 ug/Kg 1.000 01/14/25
Chlordane (Technical) ND 50 ug/Kg 1.000 01/14/25
523589-019 Surrogate %REC Limits DF Analyzed
TCMX 74 23-120 1.000 01/14/25
Decachlorobiphenyl 85 24-120 1.000 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v47
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 59 of 98
HA .P

ANALYTICAL

Page 1550 of 1860 ends

Field ID: B-16:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-020 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
523589-020 Analyte Result RL Units DF Analyzed
alpha-BHC ND 4.9 ug/Kg 0.9843 01/19/25
beta-BHC ND 4.9 ug/Kg 0.9843 01/19/25
gamma-BHC ND 4.9 ug/Kg 0.9843 01/19/25
delta-BHC ND 4.9 ug/Kg 0.9843 01/19/25
Heptachlor ND 4.9 ug/Kg 0.9843 01/19/25
Aldrin ND 4.9 ug/Kg 0.9843 01/19/25
Heptachlor epoxide ND 4.9 ug/Kg 0.9843 01/19/25
Endosulfan I ND 4.9 ug/Kg 0.9843 01/19/25
Dieldrin ND 4.9 ug/Kg 0.9843 01/19/25
4,4'-DDE 680 49 ug/Kg 9.843 01/20/25
Endrin ND 4.9 ug/Kg 0.9843 01/19/25
Endosulfan II ND 4.9 ug/Kg 0.9843 01/19/25
Endosulfan sulfate ND 4.9 ug/Kg 0.9843 01/19/25
4,4'-DDD ND 4.9 ug/Kg 0.9843 01/19/25
Endrin aldehyde ND 4.9 ug/Kg 0.9843 01/19/25
Endrin ketone ND 4.9 ug/Kg 0.9843 01/19/25
4,4'-DDT 190 4.9 ug/Kg 0.9843 01/19/25
Methoxychlor ND 9.8 ug/Kg 0.9843 01/19/25
Toxaphene ND 98 ug/Kg 0.9843 01/19/25
Chlordane (Technical) ND 49 ug/Kg 0.9843 01/19/25
523589-020 Surrogate %REC Limits DF Analyzed
TCMX 54 23-120 0.9843 01/19/25
Decachlorobiphenyl 58 24-120 0.9843 01/19/25
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v65
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 60 of 98
HA .P

ANALYTICAL

Page 1551 of 1860 ends

Field ID: B-17:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-021 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-021 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 4.9 ug/Kg 0.9804 01/14/25
beta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
gamma-BHC ND 4.9 ug/Kg 0.9804 01/14/25
delta-BHC ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor ND 4.9 ug/Kg 0.9804 01/14/25
Aldrin ND 4.9 ug/Kg 0.9804 01/14/25
Heptachlor epoxide ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan I ND 4.9 ug/Kg 0.9804 01/14/25
Dieldrin ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDE 700 25 ug/Kg 4.902 01/15/25
Endrin ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan II ND 4.9 ug/Kg 0.9804 01/14/25
Endosulfan sulfate ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDD 17 4.9 ug/Kg 0.9804 01/14/25 # C
Endrin aldehyde ND 4.9 ug/Kg 0.9804 01/14/25
Endrin ketone ND 4.9 ug/Kg 0.9804 01/14/25
4,4'-DDT 160 4.9 ug/Kg 0.9804 01/14/25
Methoxychlor ND 9.8 ug/Kg 0.9804 01/14/25
Toxaphene ND 98 ug/Kg 0.9804 01/14/25
Chlordane (Technical) ND 49 ug/Kg 0.9804 01/14/25
523589-021 Surrogate %REC Limits DF Analyzed
TCMX 73 23-120 0.9804 01/14/25
Decachlorobiphenyl 80 24-120 0.9804 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v48
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 61 of 98
HA .P

ANALYTICAL

Page 1552 of 1860 ends

Field ID: B-17:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-022 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9911 Analyzed: 01/20/25
523589-022 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE ND 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 9.9 ug/Kg
Toxaphene ND 99 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
523589-022 Surrogate %REC Limits
TCMX 48 23-120
Decachlorobiphenyl 51 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v66
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 62 of 98
HA .P

ANALYTICAL

Page 1553 of 1860 ends

Field ID: B-18:0.0-0.5 Batch#: 360079 Prep: EPA 3546
Lab ID: 523589-023 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
Basis: as received Prepared: 01/12/25
523589-023 Analyte Result RL Units DF Analyzed Qual
alpha-BHC ND 5.0 ug/Kg 1.000 01/14/25
beta-BHC ND 5.0 ug/Kg 1.000 01/14/25
gamma-BHC ND 5.0 ug/Kg 1.000 01/14/25
delta-BHC ND 5.0 ug/Kg 1.000 01/14/25
Heptachlor ND 5.0 ug/Kg 1.000 01/14/25
Aldrin ND 5.0 ug/Kg 1.000 01/14/25
Heptachlor epoxide ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan I ND 5.0 ug/Kg 1.000 01/14/25
Dieldrin ND 5.0 ug/Kg 1.000 01/14/25
4,4'-DDE 990 50 ug/Kg 10.00 01/15/25
Endrin ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan II ND 5.0 ug/Kg 1.000 01/14/25
Endosulfan sulfate ND 5.0 ug/Kg 1.000 01/14/25
4,4'-DDD 22 5.0 ug/Kg 1.000 01/14/25 # C
Endrin aldehyde ND 5.0 ug/Kg 1.000 01/14/25
Endrin ketone ND 5.0 ug/Kg 1.000 01/14/25
4,4'-DDT 270 5.0 ug/Kg 1.000 01/14/25
Methoxychlor ND 10 ug/Kg 1.000 01/14/25
Toxaphene ND 100 ug/Kg 1.000 01/14/25
Chlordane (Technical) ND 50 ug/Kg 1.000 01/14/25
523589-023 Surrogate %REC Limits DF Analyzed
TCMX 73 23-120 1.000 01/14/25
Decachlorobiphenyl 86 24-120 1.000 01/14/25
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v49
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 63 of 98
HA .P

ANALYTICAL

Page 1554 of 1860 ends

Field ID: B-18:1.5-2.0 Batch#: 360602 Prep: EPA 3546
Lab ID: 523589-024 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
Basis: as received Prepared: 01/18/25
DF: 0.9980 Analyzed: 01/20/25
523589-024 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 43 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT 7.3 5.0 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
523589-024 Surrogate %REC Limits
TCMX 52 23-120
Decachlorobiphenyl 58 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v67
Organochlorine Pesticides
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 64 of 98
HA .P

ANALYTICAL

Page 1555 of 1860 ends

Type: BLANK Batch#: 360079 Analysis: EPA 8081A
Lab ID: QC1219329 Prepared: 01/12/25 Analyst: KLR
Matrix: Soil Analyzed: 01/14/25
DF: 0.9901 Prep: EPA 3546
QC1219329 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE ND 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 9.9 ug/Kg
Toxaphene ND 99 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
QC1219329 Surrogate %REC Limits
TCMX 77 23-120
Decachlorobiphenyl 78 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v50.001
Organochlorine Pesticides: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 65 of 98
HA .P

ANALYTICAL

Page 1556 of 1860 ends

Type: LCS Batch#: 360079 Analysis: EPA 8081A
Lab ID: QC1219330 Prepared: 01/12/25 Analyst: KLR
Matrix: Soil Analyzed: 01/14/25
DF: 1.000 Prep: EPA 3546
QC1219330 Analyte Spiked Result %REC Limits Units Qual
alpha-BHC 50.00 47.76 96 22-129 ug/Kg
beta-BHC 50.00 47.56 95 28-125 ug/Kg
gamma-BHC 50.00 50.19 100 22-128 ug/Kg
delta-BHC 50.00 52.10 104 24-131 ug/Kg
Heptachlor 50.00 47.13 94 18-124 ug/Kg
Aldrin 50.00 47.27 95 23-120 ug/Kg
Heptachlor epoxide 50.00 48.04 96 26-120 ug/Kg
Endosulfan I 50.00 50.64 101 25-126 ug/Kg
Dieldrin 50.00 52.38 105 23-124 ug/Kg
4,4'-DDE 50.00 54.04 108 28-121 ug/Kg
Endrin 50.00 54.21 108 25-127 ug/Kg
Endosulfan II 50.00 50.64 101 29-121 ug/Kg
Endosulfan sulfate 50.00 49.97 100 30-121 ug/Kg
4,4'-DDD 50.00 57.83 116 26-120 ug/Kg #
Endrin aldehyde 50.00 44.63 89 10-120 ug/Kg #
Endrin ketone 50.00 51.91 104 28-125 ug/Kg
4,4'-DDT 50.00 48.42 97 22-125 ug/Kg
Methoxychlor 50.00 55.84 112 28-130 ug/Kg #
QC1219330 Surrogate %REC Limits
TCMX 72 23-120
Decachlorobiphenyl 72 24-120
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
1 of 1 v51.001
Organochlorine Pesticides: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 66 of 98
HA .P

ANALYTICAL

Page 1557 of 1860 ends

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 01/12/25 Type: MS DF: 4.902 Analyzed: 01/14/25
MSS Lab ID: 523618-061 Batch#: 360079 Prep: EPA 3546
Lab ID: QC1219331 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
QC1219331 Analyte MSS Result Spiked Result %REC Limits Units Qual alpha-BHC <8.612 49.02 46.97 96 46-120 ug/Kg
beta-BHC <6.518 49.02 53.53 109 41-120 ug/Kg
gamma-BHC <5.519 49.02 50.27 103 41-120 ug/Kg
delta-BHC <8.459 49.02 49.69 101 38-123 ug/Kg
Heptachlor <6.985 49.02 50.80 104 39-120 ug/Kg
Aldrin <13.76 49.02 50.98 104 34-120 ug/Kg
Heptachlor epoxide <9.636 49.02 52.61 107 43-120 ug/Kg
Endosulfan I <6.248 49.02 55.20 113 45-120 ug/Kg
Dieldrin <13.97 49.02 61.05 125 * 45-120 ug/Kg
4,4'-DDE <11.08 49.02 56.57 115 34-120 ug/Kg
Endrin <7.705 49.02 59.29 121 * 40-120 ug/Kg
Endosulfan II <8.717 49.02 56.16 115 41-120 ug/Kg
Endosulfan sulfate <6.343 49.02 56.00 114 42-120 ug/Kg
4,4'-DDD <18.81 49.02 62.90 128 * 41-120 ug/Kg #
Endrin aldehyde <17.81 49.02 57.26 117 30-120 ug/Kg #
Endrin ketone <13.61 49.02 54.48 111 45-120 ug/Kg
4,4'-DDT <7.295 49.02 53.29 109 35-127 ug/Kg
Methoxychlor <11.55 49.02 65.89 134 42-136 ug/Kg #
QC1219331 Surrogate %REC Limits
TCMX 82 23-120
Decachlorobiphenyl 89 24-120
1 of 2 v52.001
Organochlorine Pesticides: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 67 of 98
HA .P

ANALYTICAL

Page 1558 of 1860 ends

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 01/12/25 Type: MSD DF: 5.000 Analyzed: 01/14/25
MSS Lab ID: 523618-061 Batch#: 360079 Prep: EPA 3546
Lab ID: QC1219332 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: KLR
QC1219332 Analyte Spiked Result %REC Limits Units RPD Lim Qual alpha-BHC 50.00 44.53 89 46-120 ug/Kg 7 30
beta-BHC 50.00 48.76 98 41-120 ug/Kg 11 30
gamma-BHC 50.00 47.90 96 41-120 ug/Kg 7 30
delta-BHC 50.00 45.92 92 38-123 ug/Kg 10 30
Heptachlor 50.00 46.85 94 39-120 ug/Kg 10 30
Aldrin 50.00 48.09 96 34-120 ug/Kg 8 30
Heptachlor epoxide 50.00 48.62 97 43-120 ug/Kg 10 30
Endosulfan I 50.00 51.22 102 45-120 ug/Kg 9 30
Dieldrin 50.00 57.52 115 45-120 ug/Kg 8 30
4,4'-DDE 50.00 55.91 112 34-120 ug/Kg 3 30
Endrin 50.00 53.16 106 40-120 ug/Kg 13 30
Endosulfan II 50.00 49.96 100 41-120 ug/Kg 14 30
Endosulfan sulfate 50.00 48.35 97 42-120 ug/Kg 17 30
4,4'-DDD 50.00 56.60 113 41-120 ug/Kg 13 30 #
Endrin aldehyde 50.00 49.96 100 30-120 ug/Kg 16 30 #
Endrin ketone 50.00 47.63 95 45-120 ug/Kg 15 30
4,4'-DDT 50.00 47.74 95 35-127 ug/Kg 13 30
Methoxychlor 50.00 53.75 107 42-136 ug/Kg 22 30 #
QC1219332 Surrogate %REC Limits
TCMX 76 23-120
Decachlorobiphenyl 75 24-120
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
*: Value is outside QC limits
RPD: Relative Percent Difference
2 of 2 v52.001
Organochlorine Pesticides: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 68 of 98
HA .P

ANALYTICAL

Page 1559 of 1860 ends

Type: BLANK Batch#: 360602 Analysis: EPA 8081A
Lab ID: QC1220854 Prepared: 01/18/25 Analyst: MES
Matrix: Soil Analyzed: 01/19/25
DF: 0.9940 Prep: EPA 3546
QC1220854 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE ND 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 9.9 ug/Kg
Toxaphene ND 99 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
QC1220854 Surrogate %REC Limits
TCMX 70 23-120
Decachlorobiphenyl 78 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v68
Organochlorine Pesticides: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 69 of 98
HA .P

ANALYTICAL

Page 1560 of 1860 ends

Type: LCS Batch#: 360602 Analysis: EPA 8081A
Lab ID: QC1220855 Prepared: 01/18/25 Analyst: MES
Matrix: Soil Analyzed: 01/19/25
DF: 0.9881 Prep: EPA 3546
QC1220855 Analyte Spiked Result %REC Limits Units Qual
alpha-BHC 49.41 39.52 80 22-129 ug/Kg
beta-BHC 49.41 43.35 88 28-125 ug/Kg
gamma-BHC 49.41 43.33 88 22-128 ug/Kg
delta-BHC 49.41 41.34 84 24-131 ug/Kg
Heptachlor 49.41 44.55 90 18-124 ug/Kg
Aldrin 49.41 26.92 54 23-120 ug/Kg #
Heptachlor epoxide 49.41 38.37 78 26-120 ug/Kg
Endosulfan I 49.41 38.56 78 25-126 ug/Kg
Dieldrin 49.41 38.95 79 23-124 ug/Kg
4,4'-DDE 49.41 42.49 86 28-121 ug/Kg
Endrin 49.41 51.38 104 25-127 ug/Kg #
Endosulfan II 49.41 44.25 90 29-121 ug/Kg
Endosulfan sulfate 49.41 51.28 104 30-121 ug/Kg
4,4'-DDD 49.41 49.24 100 26-120 ug/Kg
Endrin aldehyde 49.41 31.21 63 10-120 ug/Kg
Endrin ketone 49.41 45.65 92 28-125 ug/Kg
4,4'-DDT 49.41 47.29 96 22-125 ug/Kg
Methoxychlor 49.41 58.96 119 28-130 ug/Kg #
QC1220855 Surrogate %REC Limits
TCMX 60 23-120
Decachlorobiphenyl 70 24-120
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
1 of 1 v69
Organochlorine Pesticides: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 70 of 98
HA .P

ANALYTICAL

Page 1561 of 1860 ends

Field ID: B-11:1.5-2.0 Basis: as received Prepared: 01/18/25 Type: MS DF: 0.9990 Analyzed: 01/19/25
MSS Lab ID: 523589-006 Batch#: 360602 Prep: EPA 3546
Lab ID: QC1220856 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
QC1220856 Analyte MSS Result Spiked Result %REC Limits Units Qual alpha-BHC <1.953 49.95 38.03 76 46-120 ug/Kg
beta-BHC 3.904 49.95 45.42 83 41-120 ug/Kg
gamma-BHC <1.680 49.95 41.90 84 41-120 ug/Kg
delta-BHC <2.371 49.95 39.74 80 38-123 ug/Kg
Heptachlor <1.915 49.95 42.23 85 39-120 ug/Kg
Aldrin <2.266 49.95 29.95 60 34-120 ug/Kg #
Heptachlor epoxide <2.093 49.95 35.35 71 43-120 ug/Kg
Endosulfan I <2.217 49.95 36.27 73 45-120 ug/Kg
Dieldrin <3.034 49.95 36.35 73 45-120 ug/Kg
4,4'-DDE 20.85 49.95 64.08 87 34-120 ug/Kg
Endrin <2.007 49.95 46.61 93 40-120 ug/Kg #
Endosulfan II <2.007 49.95 39.79 80 41-120 ug/Kg
Endosulfan sulfate <3.180 49.95 38.18 76 42-120 ug/Kg
4,4'-DDD <1.568 49.95 43.35 87 41-120 ug/Kg
Endrin aldehyde <3.538 49.95 33.40 67 30-120 ug/Kg
Endrin ketone <2.051 49.95 40.30 81 45-120 ug/Kg
4,4'-DDT 5.913 49.95 54.83 98 35-127 ug/Kg
Methoxychlor <3.773 49.95 54.41 109 42-136 ug/Kg #
QC1220856 Surrogate %REC Limits
TCMX 57 23-120
Decachlorobiphenyl 61 24-120
1 of 2 v70
Organochlorine Pesticides: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 71 of 98
HA .P

ANALYTICAL

Page 1562 of 1860 ends

Field ID: B-11:1.5-2.0 Basis: as received Prepared: 01/18/25 Type: MSD DF: 0.9930 Analyzed: 01/19/25
MSS Lab ID: 523589-006 Batch#: 360602 Prep: EPA 3546
Lab ID: QC1220857 Sampled: 01/08/25 Analysis: EPA 8081A Matrix: Soil Received: 01/08/25 Analyst: MES
QC1220857 Analyte Spiked Result %REC Limits Units RPD Lim Qual alpha-BHC 49.65 39.95 80 46-120 ug/Kg 6 30
beta-BHC 49.65 48.50 90 41-120 ug/Kg 7 30
gamma-BHC 49.65 44.08 89 41-120 ug/Kg 6 30
delta-BHC 49.65 42.61 86 38-123 ug/Kg 8 30
Heptachlor 49.65 45.52 92 39-120 ug/Kg 8 30
Aldrin 49.65 32.53 66 34-120 ug/Kg 9 30 #
Heptachlor epoxide 49.65 37.92 76 43-120 ug/Kg 8 30
Endosulfan I 49.65 39.71 80 45-120 ug/Kg 10 30
Dieldrin 49.65 39.71 80 45-120 ug/Kg 9 30
4,4'-DDE 49.65 66.41 92 34-120 ug/Kg 4 30
Endrin 49.65 51.51 104 40-120 ug/Kg 11 30 #
Endosulfan II 49.65 42.96 87 41-120 ug/Kg 8 30
Endosulfan sulfate 49.65 40.73 82 42-120 ug/Kg 7 30
4,4'-DDD 49.65 47.32 95 41-120 ug/Kg 9 30
Endrin aldehyde 49.65 35.72 72 30-120 ug/Kg 7 30
Endrin ketone 49.65 43.78 88 45-120 ug/Kg 9 30
4,4'-DDT 49.65 55.83 101 35-127 ug/Kg 2 30
Methoxychlor 49.65 56.67 114 42-136 ug/Kg 5 30 #
QC1220857 Surrogate %REC Limits
TCMX 60 23-120
Decachlorobiphenyl 66 24-120
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
RPD: Relative Percent Difference
2 of 2 v70
Organochlorine Pesticides: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 72 of 98
HA .P

ANALYTICAL

Page 1563 of 1860 ends

Field ID: B-9:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-001 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9709 Analyzed: 01/10/25
523589-001 Analyte Result RL Units
Arsenic 8.0 0.97 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v11
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 73 of 98
HA .P

ANALYTICAL

Page 1564 of 1860 ends

Field ID: B-10:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-003 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9524 Analyzed: 01/10/25
523589-003 Analyte Result RL Units
Arsenic 8.3 0.95 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v12
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 74 of 98
HA .P

ANALYTICAL

Page 1565 of 1860 ends

Field ID: B-11:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-005 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9515 Analyzed: 01/10/25
523589-005 Analyte Result RL Units
Arsenic 8.8 0.95 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v13
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 75 of 98
HA .P

ANALYTICAL

Page 1566 of 1860 ends

Field ID: B-12:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-007 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9709 Analyzed: 01/10/25
523589-007 Analyte Result RL Units
Arsenic 8.5 0.97 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v14
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 76 of 98
HA .P

ANALYTICAL

Page 1567 of 1860 ends

Field ID: COMP-5 Basis: as received Analyzed: 01/10/25
Lab ID: 523589-009 Sampled: 01/08/25
Matrix: Soil Received: 01/08/25
523589-009 Analyte Result RL Units DF Batch# Prepared Prep Analysis Analyst Antimony ND 2.9 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Arsenic 8.5 0.95 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Barium 260 0.95 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Beryllium 0.54 0.48 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Cadmium ND 0.48 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Chromium 57 0.95 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Cobalt 16 0.48 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Copper 46 0.95 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Lead 11 0.95 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Mercury ND 0.16 mg/Kg 1.111 359942 01/10/25 EPA 7471A EPA 7471A MLL Molybdenum ND 0.95 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Nickel 63 0.95 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Selenium ND 2.9 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Silver ND 0.48 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Thallium ND 2.9 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Vanadium 76 0.95 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Zinc 76 4.8 mg/Kg 0.9524 359910 01/09/25 EPA 3050B EPA 6010B SBW Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v2.001
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 77 of 98
HA .P

ANALYTICAL

Page 1568 of 1860 ends

Field ID: COMP-6 Basis: as received Analyzed: 01/10/25
Lab ID: 523589-010 Sampled: 01/08/25
Matrix: Soil Received: 01/08/25
523589-010 Analyte Result RL Units DF Batch# Prepared Prep Analysis Analyst Antimony ND 2.9 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Arsenic 8.0 0.96 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Barium 240 0.96 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Beryllium 0.65 0.48 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Cadmium ND 0.48 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Chromium 63 0.96 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Cobalt 16 0.48 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Copper 45 0.96 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Lead 9.4 0.96 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Mercury ND 0.16 mg/Kg 1.176 359942 01/10/25 EPA 7471A EPA 7471A MLL Molybdenum ND 0.96 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Nickel 70 0.96 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Selenium ND 2.9 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Silver ND 0.48 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Thallium ND 2.9 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Vanadium 83 0.96 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Zinc 76 4.8 mg/Kg 0.9615 359910 01/09/25 EPA 3050B EPA 6010B SBW Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v3.001
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 78 of 98
HA .P

ANALYTICAL

Page 1569 of 1860 ends

Field ID: B-13:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-011 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9901 Analyzed: 01/10/25
523589-011 Analyte Result RL Units
Arsenic 9.0 0.99 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v15
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 79 of 98
HA .P

ANALYTICAL

Page 1570 of 1860 ends

Field ID: B-14:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-013 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9804 Analyzed: 01/10/25
523589-013 Analyte Result RL Units
Arsenic 8.2 0.98 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v16
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 80 of 98
HA .P

ANALYTICAL

Page 1571 of 1860 ends

Field ID: B-15:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-015 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9524 Analyzed: 01/10/25
523589-015 Analyte Result RL Units
Arsenic 9.0 0.95 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v17
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 81 of 98
HA .P

ANALYTICAL

Page 1572 of 1860 ends

Field ID: COMP-7 Basis: as received Analyzed: 01/10/25
Lab ID: 523589-017 Sampled: 01/08/25
Matrix: Soil Received: 01/08/25
523589-017 Analyte Result RL Units DF Batch# Prepared Prep Analysis Analyst Antimony ND 2.9 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Arsenic 7.9 0.95 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Barium 240 0.95 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Beryllium 0.51 0.48 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Cadmium ND 0.48 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Chromium 55 0.95 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Cobalt 15 0.48 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Copper 43 0.95 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Lead 11 0.95 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Mercury ND 0.15 mg/Kg 1.052 359942 01/10/25 EPA 7471A EPA 7471A MLL Molybdenum ND 0.95 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Nickel 59 0.95 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Selenium ND 2.9 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Silver ND 0.48 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Thallium ND 2.9 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Vanadium 74 0.95 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Zinc 72 4.8 mg/Kg 0.9515 359910 01/09/25 EPA 3050B EPA 6010B SBW Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v4.001
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 82 of 98
HA .P

ANALYTICAL

Page 1573 of 1860 ends

Field ID: COMP-8 Basis: as received Analyzed: 01/10/25
Lab ID: 523589-018 Sampled: 01/08/25
Matrix: Soil Received: 01/08/25
523589-018 Analyte Result RL Units DF Batch# Prepared Prep Analysis Analyst Antimony ND 3.0 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Arsenic 7.8 0.99 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Barium 240 0.99 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Beryllium 0.51 0.50 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Cadmium ND 0.50 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Chromium 57 0.99 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Cobalt 16 0.50 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Copper 43 0.99 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Lead 8.6 0.99 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Mercury ND 0.16 mg/Kg 1.111 359942 01/10/25 EPA 7471A EPA 7471A MLL Molybdenum ND 0.99 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Nickel 63 0.99 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Selenium ND 3.0 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Silver ND 0.50 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Thallium ND 3.0 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Vanadium 75 0.99 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Zinc 68 5.0 mg/Kg 0.9901 359910 01/09/25 EPA 3050B EPA 6010B SBW Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v5.001
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 83 of 98
HA .P

ANALYTICAL

Page 1574 of 1860 ends

Field ID: B-16:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-019 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9615 Analyzed: 01/10/25
523589-019 Analyte Result RL Units
Arsenic 8.5 0.96 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v18
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 84 of 98
HA .P

ANALYTICAL

Page 1575 of 1860 ends

Field ID: B-17:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-021 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9524 Analyzed: 01/10/25
523589-021 Analyte Result RL Units
Arsenic 8.0 0.95 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v19
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 85 of 98
HA .P

ANALYTICAL

Page 1576 of 1860 ends

Field ID: B-18:0.0-0.5 Batch#: 359910 Prep: EPA 3050B
Lab ID: 523589-023 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
Basis: as received Prepared: 01/09/25
DF: 0.9901 Analyzed: 01/10/25
523589-023 Analyte Result RL Units
Arsenic 8.4 0.99 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v20
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 86 of 98
HA .P

ANALYTICAL

Page 1577 of 1860 ends

Field ID: COMP-9 Basis: as received Analyzed: 01/10/25
Lab ID: 523589-025 Sampled: 01/08/25
Matrix: Soil Received: 01/08/25
523589-025 Analyte Result RL Units DF Batch# Prepared Prep Analysis Analyst Antimony ND 2.9 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Arsenic 8.3 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Barium 250 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Beryllium 0.52 0.49 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Cadmium ND 0.49 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Chromium 57 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Cobalt 16 0.49 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Copper 45 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Lead 11 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Mercury ND 0.17 mg/Kg 1.200 359942 01/10/25 EPA 7471A EPA 7471A MLL Molybdenum ND 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Nickel 62 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Selenium ND 2.9 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Silver ND 0.49 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Thallium ND 2.9 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Vanadium 77 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Zinc 75 4.9 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v6.001
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 87 of 98
HA .P

ANALYTICAL

Page 1578 of 1860 ends

Field ID: COMP-10 Basis: as received Analyzed: 01/10/25 Lab ID: 523589-026 Sampled: 01/08/25
Matrix: Soil Received: 01/08/25
523589-026 Analyte Result RL Units DF Batch# Prepared Prep Analysis Analyst Antimony ND 2.9 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Arsenic 8.1 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Barium 270 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Beryllium 0.55 0.49 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Cadmium ND 0.49 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Chromium 61 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Cobalt 17 0.49 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Copper 46 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Lead 9.3 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Mercury 0.22 0.17 mg/Kg 1.200 359942 01/10/25 EPA 7471A EPA 7471A MLL Molybdenum ND 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Nickel 70 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Selenium ND 2.9 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Silver ND 0.49 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Thallium ND 2.9 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Vanadium 77 0.98 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Zinc 73 4.9 mg/Kg 0.9804 359910 01/09/25 EPA 3050B EPA 6010B SBW Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v7.001
Metals Analytical Report
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 88 of 98
HA .P

ANALYTICAL

Page 1579 of 1860 ends

Type: BLANK Batch#: 359910 Analysis: EPA 6010B
Lab ID: QC1218731 Prepared: 01/09/25 Analyst: SBW
Matrix: Soil Analyzed: 01/10/25
DF: 1.000 Prep: EPA 3050B
QC1218731 Analyte Result RL Units
Antimony ND 3.0 mg/Kg
Arsenic ND 1.0 mg/Kg
Barium ND 1.0 mg/Kg
Beryllium ND 0.50 mg/Kg
Cadmium ND 0.50 mg/Kg
Chromium ND 1.0 mg/Kg
Cobalt ND 0.50 mg/Kg
Copper ND 1.0 mg/Kg
Lead ND 1.0 mg/Kg
Molybdenum ND 1.0 mg/Kg
Nickel ND 1.0 mg/Kg
Selenium ND 3.0 mg/Kg
Silver ND 0.50 mg/Kg
Thallium ND 3.0 mg/Kg
Vanadium ND 1.0 mg/Kg
Zinc ND 5.0 mg/Kg
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v21
Metals Analytical Report: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 89 of 98
HA .P

ANALYTICAL

Page 1580 of 1860 ends

Type: LCS Batch#: 359910 Analysis: EPA 6010B
Lab ID: QC1218732 Prepared: 01/09/25 Analyst: SBW
Matrix: Soil Analyzed: 01/10/25
DF: 1.000 Prep: EPA 3050B
QC1218732 Analyte Spiked Result %REC Limits Units
Antimony 100.0 105.3 105 80-120 mg/Kg
Arsenic 100.0 97.39 97 80-120 mg/Kg
Barium 100.0 104.2 104 80-120 mg/Kg
Beryllium 100.0 102.1 102 80-120 mg/Kg
Cadmium 100.0 102.8 103 80-120 mg/Kg
Chromium 100.0 100.1 100 80-120 mg/Kg
Cobalt 100.0 104.9 105 80-120 mg/Kg
Copper 100.0 95.23 95 80-120 mg/Kg
Lead 100.0 104.0 104 80-120 mg/Kg
Molybdenum 100.0 99.20 99 80-120 mg/Kg
Nickel 100.0 103.0 103 80-120 mg/Kg
Selenium 100.0 94.17 94 80-120 mg/Kg
Silver 50.00 49.21 98 80-120 mg/Kg
Thallium 100.0 100.6 101 80-120 mg/Kg
Vanadium 100.0 100.2 100 80-120 mg/Kg
Zinc 100.0 96.18 96 80-120 mg/Kg
1 of 1 v22
Metals Analytical Report: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 90 of 98
HA .P

ANALYTICAL

Page 1581 of 1860 ends

Field ID: B-9:0.0-0.5 Basis: as received Prepared: 01/09/25 Type: MS DF: 0.9709 Analyzed: 01/10/25
MSS Lab ID: 523589-001 Batch#: 359910 Prep: EPA 3050B
Lab ID: QC1218733 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
QC1218733 Analyte MSS Result Spiked Result %REC Limits Units Antimony <1.436 97.09 36.45 38 * 75-125 mg/Kg
Arsenic 7.971 97.09 102.2 97 75-125 mg/Kg
Barium 245.5 97.09 352.7 110 75-125 mg/Kg
Beryllium 0.5285 97.09 98.90 101 75-125 mg/Kg
Cadmium 0.4504 97.09 97.97 100 75-125 mg/Kg
Chromium 54.92 97.09 153.9 102 75-125 mg/Kg
Cobalt 15.38 97.09 114.3 102 75-125 mg/Kg
Copper 43.61 97.09 142.5 102 75-125 mg/Kg
Lead 10.64 97.09 108.2 100 75-125 mg/Kg
Molybdenum 0.6357 97.09 90.53 93 75-125 mg/Kg
Nickel 59.08 97.09 156.4 100 75-125 mg/Kg
Selenium 1.717 97.09 91.67 93 75-125 mg/Kg
Silver 0.2198 48.54 48.12 99 75-125 mg/Kg
Thallium <1.061 97.09 94.78 98 75-125 mg/Kg
Vanadium 74.15 97.09 179.1 108 75-125 mg/Kg
Zinc 73.93 97.09 163.3 92 75-125 mg/Kg
Field ID: B-9:0.0-0.5 Basis: as received Prepared: 01/09/25 Type: MSD DF: 0.9524 Analyzed: 01/10/25
MSS Lab ID: 523589-001 Batch#: 359910 Prep: EPA 3050B
Lab ID: QC1218734 Sampled: 01/08/25 Analysis: EPA 6010B Matrix: Soil Received: 01/08/25 Analyst: SBW
QC1218734 Analyte Spiked Result %REC Limits Units RPD Lim Antimony 95.24 35.92 38 * 75-125 mg/Kg 0 41
Arsenic 95.24 100.9 98 75-125 mg/Kg 0 35
Barium 95.24 354.7 115 75-125 mg/Kg 1 20
Beryllium 95.24 97.39 102 75-125 mg/Kg 0 20
Cadmium 95.24 96.63 101 75-125 mg/Kg 1 20
Chromium 95.24 153.7 104 75-125 mg/Kg 1 20
Cobalt 95.24 113.1 103 75-125 mg/Kg 1 20
Copper 95.24 141.9 103 75-125 mg/Kg 1 20
Lead 95.24 107.0 101 75-125 mg/Kg 1 20
Molybdenum 95.24 88.66 92 75-125 mg/Kg 0 20
Nickel 95.24 155.8 102 75-125 mg/Kg 1 20
Selenium 95.24 90.34 93 75-125 mg/Kg 0 20
Silver 47.62 47.33 99 75-125 mg/Kg 0 20
Thallium 95.24 93.27 98 75-125 mg/Kg 0 20
Vanadium 95.24 179.1 110 75-125 mg/Kg 1 20
Zinc 95.24 163.2 94 75-125 mg/Kg 1 20
Legend
*: Value is outside QC limits
RPD: Relative Percent
Difference
1 of 1 v23
Metals Analytical Report: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 91 of 98
HA .P

ANALYTICAL

Page 1582 of 1860 ends

Field ID: B-9:0.0-0.5 Basis: as received Analyzed: 01/10/25 Type: Post Digest Spike DF: 0.9709 Prep: EPA 3050B
MSS Lab ID: 523589-001 Batch#: 359910 Analysis: EPA 6010B Lab ID: QC1218735 Sampled: 01/08/25 Analyst: SBW
Matrix: Soil Received: 01/08/25
QC1218735 Analyte MSS Result Spiked Result %REC Limits Units Antimony <1.436 97.09 98.74 102 75-125 mg/Kg
Arsenic 7.971 97.09 99.60 94 75-125 mg/Kg
Barium 245.5 97.09 335.0 92 75-125 mg/Kg
Beryllium 0.5285 97.09 94.48 97 75-125 mg/Kg
Cadmium 0.4504 97.09 93.77 96 75-125 mg/Kg
Chromium 54.92 97.09 145.7 94 75-125 mg/Kg
Cobalt 15.38 97.09 109.9 97 75-125 mg/Kg
Copper 43.61 97.09 137.3 96 75-125 mg/Kg
Lead 10.64 97.09 104.5 97 75-125 mg/Kg
Molybdenum 0.6357 97.09 94.57 97 75-125 mg/Kg
Nickel 59.08 97.09 151.3 95 75-125 mg/Kg
Selenium 1.717 97.09 89.84 91 75-125 mg/Kg
Silver 0.2198 48.54 47.02 96 75-125 mg/Kg
Thallium <1.061 97.09 91.48 94 75-125 mg/Kg
Vanadium 74.15 97.09 166.3 95 75-125 mg/Kg
Zinc 73.93 97.09 158.1 87 75-125 mg/Kg
1 of 1 v24
Metals Analytical Report: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 92 of 98
HA .P

ANALYTICAL

Page 1583 of 1860 ends

Type: BLANK Batch#: 359942 Analysis: EPA 7471A
Lab ID: QC1218863 Prepared: 01/10/25 Analyst: MLL
Matrix: Soil Analyzed: 01/10/25
DF: 0.9998 Prep: EPA 7471A
QC1218863 Analyte Result RL Units
Mercury ND 0.14 mg/Kg
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v8
Metals Analytical Report: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 93 of 98
HA .P

ANALYTICAL

Page 1584 of 1860 ends

Type: LCS Batch#: 359942 Analysis: EPA 7471A
Lab ID: QC1218864 Prepared: 01/10/25 Analyst: MLL
Matrix: Soil Analyzed: 01/10/25
DF: 0.9998 Prep: EPA 7471A
QC1218864 Analyte Spiked Result %REC Limits Units
Mercury 0.8333 0.7988 96 80-120 mg/Kg
1 of 1 v9
Metals Analytical Report: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 94 of 98
HA .P

ANALYTICAL

Page 1585 of 1860 ends

Field ID: COMP-5 Basis: as received Prepared: 01/10/25
Type: MS DF: 1.132 Analyzed: 01/10/25
MSS Lab ID: 523589-009 Batch#: 359942 Prep: EPA 7471A
Lab ID: QC1218865 Sampled: 01/08/25 Analysis: EPA 7471A Matrix: Soil Received: 01/08/25 Analyst: MLL
QC1218865 Analyte MSS Result Spiked Result %REC Limits Units Mercury 0.06235 0.9434 0.9318 92 75-125 mg/Kg
Field ID: COMP-5 Basis: as received Prepared: 01/10/25
Type: MSD DF: 1.052 Analyzed: 01/10/25
MSS Lab ID: 523589-009 Batch#: 359942 Prep: EPA 7471A
Lab ID: QC1218866 Sampled: 01/08/25 Analysis: EPA 7471A Matrix: Soil Received: 01/08/25 Analyst: MLL
QC1218866 Analyte Spiked Result %REC Limits Units RPD Lim Mercury 0.8772 0.8908 94 75-125 mg/Kg 2 20
Legend
RPD: Relative Percent
Difference
1 of 1 v10
Metals Analytical Report: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 95 of 98
HA .P

ANALYTICAL

Page 1586 of 1860 ends

Field ID: COMP-5 Batch#: 360769 Prep: METHOD
Type: SAMPLE Sampled: 01/08/25 Analysis: EPA 6010B
Lab ID: 523589-009 Received: 01/08/25 Analyst: SBW
Matrix: WET Leachate Prepared: 01/20/25
DF: 10.00 Analyzed: 01/20/25
523589-009 Analyte Result RL Units
Chromium ND 0.30 mg/L
Field ID: COMP-6 Batch#: 360769 Prep: METHOD
Type: SAMPLE Sampled: 01/08/25 Analysis: EPA 6010B
Lab ID: 523589-010 Received: 01/08/25 Analyst: SBW
Matrix: WET Leachate Prepared: 01/20/25
DF: 10.00 Analyzed: 01/20/25
523589-010 Analyte Result RL Units
Chromium ND 0.30 mg/L
Field ID: COMP-7 Batch#: 360769 Prep: METHOD
Type: SAMPLE Sampled: 01/08/25 Analysis: EPA 6010B
Lab ID: 523589-017 Received: 01/08/25 Analyst: SBW
Matrix: WET Leachate Prepared: 01/20/25
DF: 10.00 Analyzed: 01/20/25
523589-017 Analyte Result RL Units
Chromium ND 0.30 mg/L
Field ID: COMP-8 Batch#: 360769 Prep: METHOD
Type: SAMPLE Sampled: 01/08/25 Analysis: EPA 6010B
Lab ID: 523589-018 Received: 01/08/25 Analyst: SBW
Matrix: WET Leachate Prepared: 01/20/25
DF: 10.00 Analyzed: 01/20/25
523589-018 Analyte Result RL Units
Chromium ND 0.30 mg/L
Field ID: COMP-9 Batch#: 360769 Prep: METHOD
Type: SAMPLE Sampled: 01/08/25 Analysis: EPA 6010B
Lab ID: 523589-025 Received: 01/08/25 Analyst: SBW
Matrix: WET Leachate Prepared: 01/20/25
DF: 10.00 Analyzed: 01/20/25
523589-025 Analyte Result RL Units
Chromium ND 0.30 mg/L
1 of 2 v56
Chromium
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 96 of 98
HA .P

ANALYTICAL

Page 1587 of 1860 ends

Field ID: COMP-10 Batch#: 360769 Prep: METHOD
Type: SAMPLE Sampled: 01/08/25 Analysis: EPA 6010B
Lab ID: 523589-026 Received: 01/08/25 Analyst: SBW
Matrix: WET Leachate Prepared: 01/20/25
DF: 10.00 Analyzed: 01/20/25
523589-026 Analyte Result RL Units
Chromium ND 0.30 mg/L
Type: BLANK Batch#: 360769 Analysis: EPA 6010B
Lab ID: QC1221422 Prepared: 01/20/25 Analyst: SBW
Matrix: WET Leachate Analyzed: 01/20/25
DF: 10.00 Prep: METHOD
QC1221422 Analyte Result RL Units
Chromium ND 0.30 mg/L
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v56
Chromium
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 97 of 98
HA .P

ANALYTICAL

Page 1588 of 1860 ends

Type: BS Batch#: 360769 Analysis: EPA 6010B
Lab ID: QC1221423 Prepared: 01/20/25 Analyst: SBW
Matrix: WET Leachate Analyzed: 01/20/25
DF: 10.00 Prep: METHOD
QC1221423 Analyte Spiked Result %REC Limits Units
Chromium 4.000 3.770 94 80-120 mg/L
Type: BSD Batch#: 360769 Analysis: EPA 6010B
Lab ID: QC1221424 Prepared: 01/20/25 Analyst: SBW
Matrix: WET Leachate Analyzed: 01/20/25
DF: 10.00 Prep: METHOD
QC1221424 Analyte Spiked Result %REC Limits Units RPD Lim Chromium 4.000 3.728 93 80-120 mg/L 1 20
Legend
RPD: Relative Percent
Difference
1 of 1 v57
Chromium: Batch QC
Lab #: 523589 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 98 of 98
HA .P

ANALYTICAL

Page 1589 of 1860 ends

388 17th Street, Suite 230, Oakland, CA 94612 | (510) 420-8686 | www.baseline-env.com Mailing Address: PO Box 18586, Oakland, CA 94619

MEMORANDUM
Date: November 14, 2025 Job No.: 24201-01
To: Shravan Sundaram, Contra Costa County Public Works Department From: Cem Atabek and William Scott, Baseline Environmental Consulting Subject: Peer Review of ACC Letter Regarding Management of Pesticide-Containing Soils, Planned East County Service Center, Brentwood, California Baseline Environmental Consulting (Baseline) has performed a peer review on behalf of the Contra Costa County Public Works Department (County) for the letter prepared by ACC Environmental Consultants, Inc. (ACC) dated 27 October 2025, regarding management of pesticide-containing soils (ACC Letter) for the Planned East County Service Center (project) located at Assessor’s Parcel Numbers (APNs): 016-410-008, 016-410-009, 016-410-010, 016- 410-011, 016-410-012, 016-410-013, and 016-120-024 in Brentwood, California (Site). The ACC Letter provides ACC’s opinion regarding the management of pesticide-containing soils at the Site following ACC’s review of the Soil Investigation Report dated 3 October 2024, and Phase II Environmental Site Assessment (ESA) dated 10 February 2025, prepared by Baseline for the northern and southern portions of the Site, respectively.

BACKGROUND
Baseline’s Soil Investigation Report and Phase II ESA documented soil sampling and analysis activities which were performed primarily for the purpose of evaluating potential contamination from organochlorine pesticides (OCPs) and arsenic in shallow soil based on historical agricultural use of the Site. Baseline also performed analysis of other constituents in shallow soil for potential soil disposal waste characterization purposes. Baseline’s boring locations are depicted in the attached Figure 1.

Baseline compared the analytical results from our investigations to the Environmental Screening Levels (ESLs) for construction worker direct exposure (Construction Worker ESLs) and commercial/industrial direct exposure (Commercial ESLs) established by the San Francisco Bay Regional Water Quality Control Board (Regional Water Board) in 2019; naturally occurring background concentrations for metals; and hazardous waste criteria as defined in California Code of Regulations (CCR) Title 22, including: comparison of concentrations to Total Threshold Limit Concentrations (TTLCs), Solubility Threshold Limit Concentrations (STLCs), Toxicity Characteristic Leaching Procedure (TCLP) thresholds, and trigger levels for soluble metals testing.

BASELINE

ENVIRONMENTAL CONSULTING

Page 1590 of 1860 ends

Memorandum
November 14, 2025

Page 2 ends

24201-01 ACC Letter Peer Review.rev
The detected concentrations of arsenic exceeded the Commercial and Construction Worker ESLs established at the time; however, the arsenic concentrations appeared to be naturally occurring background levels. No other analytical results exceeded the Commercial and Construction Worker ESLs established at the time. No specific handling or disposal requirements were recommended based on the arsenic concentrations other than notifying the contractor of the soil investigation findings so that they can ensure that their workers have appropriate training and take appropriate health and safety precautions. Baseline indicated that if the Site is developed with no exposed soil surfaces remaining, there would be no risk of exposure to arsenic in soil for future occupants of the Site. No other analytical results exceeded the Commercial and Construction Worker ESLs established at the time.

Baseline indicated that soil excavated from the ground surface to a depth of 1.5 feet below ground surface (bgs1) in the northcentral and southern areas of the Site should be classified as California-hazardous (or non-RCRA hazardous2) waste for off-Site disposal purposes based on the analytical results for OCPs (concentrations of 4,4'-DDE and the combined concentrations of 4,4'-DDE, 4,4'-DDD, and 4,4'-DDT) exceeding California-hazardous waste criteria. No other analytical results exceeded hazardous waste criteria. The area where soil above 1.5 feet bgs should be classified as California-hazardous waste for off-Site disposal purposes (in the absence of further soil testing) is depicted in the attached Figure 1. Soil excavated from outside of this area or from below 1.5 feet bgs anywhere on-Site should be classified as non-hazardous waste for off-Site disposal purposes.

Baseline indicated that stockpiling and testing of soil excavated on the Site may be performed prior to off-Site disposal or on-Site re-use to re-evaluate the chemical quality and waste classification of the soil. Baseline recommended that the construction contractor should prepare a Soil Management Plan (SMP) which should outline how they will segregate, manage, test, re-use, and dispose of soil generated from excavation and grading activities on the Site.

PEER REVIEW OF ACC LETTER
The ACC letter summarized findings from Baseline’s investigations and compared some (but not all) of the detected concentrations of OCPs to updated ESLs established by the Regional Water Board in 2025 (2025 ESLs), including ESLs for residential direct exposure (Residential ESLs).

Baseline did not compare analytical results from our investigations to Residential ESLs based on our understanding of the project design at the time of our investigations. Baseline presumes that ACC compared select results for OCPs to Residential ESLs because the current project plans include a playground and some larger areas of landscaping/bioswales (see Figure 1) where the public could potentially contact soil, as residential screening levels are typically used to 1 All uses of bgs in this document refer to depths below the existing ground surface at the Site. 2 Non-RCRA hazardous waste refers to hazardous waste as defined under California law (CCR Title 22) which is not defined as hazardous waste under the Federal Resource Conservation and Recovery Act (RCRA).

BASELINE

ENVIRONMENTAL CONSULTING

Page 1591 of 1860 ends

Memorandum
November 14, 2025

Page 3 ends

24201-01 ACC Letter Peer Review.rev
evaluate soil exposure risks for parks as a conservative approach for protecting the public.

Baseline notes that ACC did not compare all of the detected concentrations of OCPs to the 2025 ESLs, and concentrations of toxaphene were detected above the Residential ESL at the Site, including in the area of the planned playground and larger landscaping/bioswales areas in the northern portion of the Site. Baseline has updated the attached Tables 1 and 2 presenting our previous investigations results to include the 2025 ESLs (including Residential ESLs), and we have prepared an updated evaluation of Baseline’s investigation results based on the updated data tables and our current understanding of the project design, as discussed below.

The ACC letter indicates that soil at planned planters and bioswale areas will be excavated to approximately 3 feet bgs for installation of geofabric and imported planting materials, and recommends that soil at the location of the planned playground additionally be excavated to a minimum of 1.5 feet bgs, the depth at which the soils would no longer be considered hazardous waste if hauled off-Site for disposal.

Based on a meeting with the County and project contractor on 10 November 2025, Baseline understands that excavation of existing soil to approximately 3 feet bgs at the planters and bioswale areas is not currently planned. Baseline understands that the excavation depths for planter/bioswale areas will depend on further soil quality evaluation and development of the project design, and that existing soil at the Site could potentially remain in-place or be re-used as fill in planter/bioswale areas. Baseline recommends excavation and replacement of soil in select areas to mitigate the risk of potential public exposure to toxaphene concentrations in soil that exceed the Residential ESL, as discussed further below.

The ACC letter indicates that soils remaining on-Site could be capped by building foundations, asphalt parking lots, and other hardscape subsequent to construction, and no additional capping methods are recommended for this project. Based on the concentration of OCPs detected at the Site and planned non-residential use of the Site, Baseline notes that such capping of remaining existing soil should not actually be required to prevent potential soil exposure risks; however, installation of hardscape over existing soils throughout much of the Site is already part of the project design.

The ACC letter indicates that hazardous waste thresholds are based on various environmental factors and do not always coincide with human health risk screening levels. Baseline concurs with this statement and notes that the concentrations of OCPs detected at the Site which exceed California-hazardous waste criteria are below human health risk screening levels including the Residential, Commercial, and Construction Worker ESLs. The ACC letter indicates that in order to define whether a material is hazardous waste, it is first necessary to determine if the material is a “waste”, and that per CCR Title 22, Section 66261.2(a) "waste" means “any discarded material of any form.” The ACC letter indicates that if soils with 4,4'-DDD, 4,4'-DDE, and/or 4,4'-DDT concentrations (individually or as a sum of the three corresponding

Page 1592 of 1860 ends

Memorandum
November 14, 2025

Page 4 ends

24201-01 ACC Letter Peer Review.rev
concentrations ) exceeding the California-hazardous waste concentration of 1.0 milligram per kilogram (mg/kg) are removed from the Site, the soils should be considered “discarded” and treated as hazardous waste per CCR Title 22 hazardous waste criteria. The ACC letter indicates that it is acceptable to stockpile soils to be hauled off-Site for disposal and characterize the actual waste stream (sample the stockpiled soil) prior to waste characterization and disposal.

Baseline’s Soil Investigation Report and Phase II ESA also indicated that soil excavated from the Site may be stockpiled and tested prior to off-Site disposal or on-Site re-use to re-evaluate the chemical quality and waste classification of the soil.

Baseline notes that placement of soil characterized as hazardous waste (as defined per CCR Title 22) into or onto the ground without appropriate permits/approvals from regulatory agencies would be considered unpermitted (i.e., illegal) disposal of hazardous waste. It is not clear whether the ACC letter implies that soil should be considered a hazardous waste only if transported away from the Site, or if soil should be considered a hazardous waste once removed (i.e., excavated or graded) from its current location within the Site. If the former, then it appears that the ACC letter is implying, but not explicitly stating, that excavated/graded soil which would be classified as hazardous waste for off-Site disposal purposes could potentially be re-used as fill material on-Site because the soil would not be discarded and therefore would not be considered waste.

Baseline notes that there appears to be a gray area in hazardous waste regulations related to the re-use of soil on a property from which the soil was generated if the soil meets risk-based thresholds but would be classified as hazardous waste for off-site disposal. The Department of Toxic Substances Control (DTSC) has a web page titled Defining Hazardous Waste which is available at https://dtsc.ca.gov/defining-hazardous-waste/. The excerpt below is from the Contained-In Policy section of this web page:
“The contained-in policy applies to RCRA and non-RCRA contaminated environmental media (soil, ground and surface water, and sediments) and debris. Only the contained-in-policy for debris has been codified in 40 CFR section 261.3(f) and 22 CCR section 66261.3(e).

Environmental media typically can become contaminated though accidental spills of hazardous waste which may cause the media to be subject to regulation under RCRA since they “contain” a hazardous waste. Under the contained-in policy, environmental media contaminated with a hazardous waste must be managed as hazardous wastes until it no longer “contains” a listed waste, no longer exhibits a characteristic, or is delisted. U.S. EPA does not have set guidelines with established levels at which contaminated environmental media are no longer considered to contain hazardous waste. Instead, these levels are site specific and determined on a case-by-case basis by either U.S. EPA or an authorized state.

DTSC implements the contained-in policy to environmental media contaminated with RCRA and non-RCRA hazardous waste. For example, soil contaminated with a spent trichloroethylene-based solvent, a listed waste (F002), would be subject to hazardous waste

Page 1593 of 1860 ends

Memorandum
November 14, 2025

Page 5 ends

24201-01 ACC Letter Peer Review.rev
requirements unless the handler can show that the soil concentration levels are below a DTSC-established, site-specific health-based level. In addition to federal listings and characteristics, the contained-in policy could be applied to media contaminated with nonRCRA hazardous wastes such as nickel contaminated soil.” According to DTSC’s description of the Contained-In Policy as presented above, it could be interpreted that excavation or grading of contaminated soil with concentrations exceeding hazardous waste thresholds should be managed in accordance with hazardous waste requirements and such soil should not be re-used on the property. It could also be interpreted that such soil would not be subject to hazardous waste requirements if the contaminant concentrations are below applicable health-based screening levels for the anticipated use of the property and the soil can be re-used on the property.

UPDATED EVALUATION OF BASELINE INVESTIGATION RESULTS
Analytical results from Baseline’s investigations are presented in Table 1 (Title 22 Metals) and Table 2 (OCPs) along with the 2025 ESLs. Concentrations of other analytes are not presented in tables or discussed further below as they were not detected above laboratory reporting limits.

An updated evaluation of Baseline’s investigation results is presented below based on comparison to the 2025 ESLs and our current understanding of the project.

Metals
Concentrations of nickel equal to and exceeding the Construction Worker ESL of 63 mg/kg (a decrease from 86 mg/kg in the 2019 ESLs) were detected in multiple soil samples (Table 1). The detected concentrations of nickel ranged from 44 to 70 mg/kg. An average background concentration for nickel of 57 mg/kg was established in a study of naturally occurring background metals in California soil.3 Baseline notes that although some concentrations of nickel detected at the Site slightly exceed this average background concentration, the detected concentrations were well within the range of naturally occurring nickel concentrations noted in the background metals study. It appears that the nickel is naturally occurring based on the relatively narrow range of detected concentrations and in Baseline’s experience, naturally occurring concentrations of nickel exceeding 57 mg/kg are commonly detected in Bay Area soils.

Concentrations of arsenic ranging from 7.8 to 11 mg/kg were detected in all of the samples analyzed. The detected concentrations of arsenic exceed the Construction Worker ESL of 1.1 mg/kg, Commercial ESL of 0.14 mg/kg, and Residential ESL of 0.032 mg/kg (Table 1). Naturally occurring background concentrations of arsenic commonly exceed ESLs. A master’s thesis 3 Kearney Foundation of Soil Science, 1996. Average Background Concentrations of Trace and Major Elements in California Soils, March.

BASELINE

ENVIRONMENTAL CONSULTING

Page 1594 of 1860 ends

Memorandum
November 14, 2025

Page 6 ends

24201-01 ACC Letter Peer Review.rev
document4 previously provided as supplemental information on the Regional Water Board’s website for ESLs indicates that the proposed upper estimate for background arsenic (99th percentile) within undifferentiated flatland soil of the San Francisco Bay Area is 11 mg/kg.

Considering that the arsenic concentrations detected in samples from multiple depths across the Site were relatively consistent and were below the established background arsenic level of 11 mg/kg, it appears that the detected levels of arsenic in soil at the Site are naturally occurring.

Concentrations of all other metals analyzed were either not detected above the laboratory reporting limits or were detected at concentrations below Construction Worker ESLs, Commercial ESLs, and Residential ESLs. No specific soil handling or disposal requirements are recommended based on the arsenic and nickel concentrations other than notifying the contractor of Baseline’s findings so that they can ensure that their workers have appropriate training and take appropriate health and safety precautions.

Organochlorine Pesticides
Concentration of OCPs including 4,4'-DDD, 4,4'-DDE, 4,4'-DDT, dieldrin, toxaphene, and aldrin were detected in the soil samples analyzed (Table 2). The detected concentrations of OCPs were below their respective Construction Worker ESLs, Commercial ESLs, and Residential ESLs except for toxaphene which was detected at concentrations exceeding the Residential ESL of 450 micrograms per kilogram (µg/kg). Toxaphene was detected in surface soil samples collected in the northern portion of the Site from borings B-4, B-5, B-6, and B-8 (Figure 1), with detected concentrations ranging from 480 to 1,400 µg/kg. Toxaphene was not detected above laboratory reporting limits in any other soil samples.

The locations where toxaphene was detected at concentrations exceeding the Residential ESL generally coincide with the locations where concentrations of 4,4'-DDE (and combined concentrations of 4,4'-DDD, 4,4'-DDE, 4,4'-DDT) were detected above the California-hazardous waste criteria of 1,000 µg/kg in the northcentral portion of the Site. The area where toxaphene was detected above the Residential ESL includes areas where a playground and larger landscaping/bioswales are planned to be constructed, as shown on Figure 1 (the area outlined in green).

RECOMMENDATIONS REGARDING SOIL EXCAVATION AND RE-USE
Based on a meeting with the County and project contractor on 10 November 2025, Baseline understands that the County would approve of on-Site re-use of soil that would be classified as 4 Duverge, Dylan, 2011. Establishing Background Arsenic in Soil of the Urbanized San Francisco Bay Region, December.

BASELINE

ENVIRONMENTAL CONSULTING

Page 1595 of 1860 ends

Memorandum
November 14, 2025

Page 7 ends

24201-01 ACC Letter Peer Review.rev
hazardous waste for off-Site disposal purposes if the on-Site re-use would not cause an unacceptable risk to human health. Based on the soil sample analytical results from Baseline’s investigations and the planned use of the Site, the only potential unacceptable risk to human health would be potential exposure of the public to toxaphene concentrations above the Residential ESL in planned planter/bioswale areas and the playground area.

Baseline recommends the excavation of existing soil to a depth of approximately 1.5 feet bgs at the planter/bioswale areas and playground area within the portion of the Site outlined in green (in the vicinity of borings B-4 through B-6 and B-8) as shown on Figure 1, and replacement of this excavated soil with imported clean fill materials or on-Site soil that is acceptable for re-use within planter/bioswale areas as discussed below. Based on the County’s stance regarding reuse of soil on-Site, this excavated soil could be-reused on-Site as fill material beneath hardscape. This would mitigate the risk of potential public exposure to toxaphene concentrations in soil that exceed the Residential ESL.

Based on the County’s stance regarding re-use of soil on-Site, soil excavated from outside of the area outlined in green (in the vicinity of borings B-1 through B-3, B-7, and B-9 through B-18) on Figure 1 and soil excavated from below 1.5 feet bgs within the area outlined in green may be re-used as fill material anywhere within the Site, including beneath hardscape or within planter/bioswale areas and the playground area.

Baseline’s recommendations regarding the re-use of soil on-Site do not account for geotechnical or horticultural requirements for re-use of soil. Any re-use of soil should be performed in accordance with project specifications and with County approval.

Sincerely,
William Scott, PG Cem Atabek
Senior Field Geologist Senior Environmental Engineer

BASELINE

ENVIRONMENTAL CONSULTING

Page 1596 of 1860 ends

FIGURE

Page 1597 of 1860 ends

24201-01 Figure 1 11/05/25
Figure 1
Boring Locations and Extent of Soil Contamination
Proposed East County Service Center, Brentwood, California 0 125 Feet
N
Note: Project layout is approximate.

Extent of Soil with Toxaphene above Residential ESL from Ground Surface to 1.5 Feet Below Ground Surface
Extent of Non-RCRA California-Hazardous Waste from
Ground Surface to 1.5 Feet Below Ground Surface Boring Locations Site Boundary
Legend
0 CJ D A

BASELINE

ENVIRONMENTAL CONSULTING

Page 1598 of 1860 ends

TABLES

Page 1599 of 1860 ends

Table 1: Analytical Results for Metals
East County Service CenterBrentwood, CA
Sample ID Boring Location
Sample Depths
(ft bgs)
Sample
Collection
Date
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
WET Chromium
(mg/L)
Cobalt
Copper
Lead
Mercury
Molybdenum
Nickel
Selenium
Silver
Thallium
Vanadium
Zinc
B-1:0.5-1.0 B-1 0.5-1.0 8/5/24 -- 8.4 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- B-2:0.5-1.0 B-2 0.5-1.0 8/5/24 -- 9.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- B-3:0.0-0.5 B-3 0.0-0.5 8/5/24 -- 9.8 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- B-4:0.0-0.5 B-4 0.0-0.5 8/5/24 -- 11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-5:0.0-0.5 B-5 0.0-0.5 8/5/24 -- 10 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-6:0.0-0.5 B-6 0.0-0.5 8/5/24 -- 10 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-7:0.0-0.5 B-7 0.0-0.5 8/5/24 -- 9.5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-8:0.0-0.5 B-8 0.0-0.5 8/5/24 -- 9.9 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --COMP-1 B-1 through B-4 0.0-0.5 & 0.5-1.0* 8/5/24 <3.0 10 220 0.63 <0.50 44 -- 13 36 10 <0.15 <0.99 44 <3.0 <0.50 <3.0 70 74 COMP-2 B-1 through B-4 1.5-2.0 & 2.0-2.5* 8/5/24 <2.9 10 260 0.62 <0.49 59 <0.30 16 46 10 <0.17 <0.97 62 <2.9 <0.49 <2.9 84 76COMP-3 B-5 through B-8 0.0-0.5 8/5/24 <2.9 10 270 0.65 <0.49 59 <0.30 16 46 11 <0.14 <0.98 60 <2.9 <0.49 <2.9 85 82 COMP-4 B-5 through B-8 1.5-2.0 8/5/24 <2.9 9.5 260 0.55 <0.49 59 <0.30 17 46 8.5 0.18 <0.98 65 <2.9 <0.49 <2.9 73 72 B-9:0.0-0.5 B-9 0.0-0.5 1/8/25 -- 8.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- B-10:0.0-0.5 B-10 0.0-0.5 1/8/25 -- 8.3 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-11:0.0-0.5 B-11 0.0-0.5 1/8/25 -- 8.8 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-12:0.0-0.5 B-12 0.0-0.5 1/8/25 -- 8.5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-13:0.0-0.5 B-13 0.0-0.5 1/8/25 -- 9.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-14:0.0-0.5 B-14 0.0-0.5 1/8/25 -- 8.2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-15:0.0-0.5 B-15 0.0-0.5 1/8/25 -- 9.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-16:0.0-0.5 B-16 0.0-0.5 1/8/25 -- 8.5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-17:0.0-0.5 B-17 0.0-0.5 1/8/25 -- 8.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --B-18:0.0-0.5 B-18 0.0-0.5 1/8/25 -- 8.4 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --COMP-5 B-9 through B-12 0.0-0.5 1/8/25 <2.9 8.5 260 0.54 <0.48 57 <0.30 16 46 11 <0.16 <0.95 63 <2.9 <0.48 <2.9 76 76 COMP-6 B-9 through B-12 1.5-2.0 1/8/25 <2.9 8.0 240 0.65 <0.48 63 <0.30 16 45 9.4 <0.16 <0.96 70 <2.9 <0.48 <2.9 83 76COMP-7 B-13 through B-15 0.0-0.5 1/8/25 <2.9 7.9 240 0.51 <0.48 55 <0.30 15 43 11 <0.15 <0.95 59 <2.9 <0.48 <2.9 74 72COMP-8 B-13 through B-15 1.5-2.0 1/8/25 <3.0 7.8 240 0.51 <0.50 57 <0.30 16 43 8.6 <0.16 <0.99 63 <3.0 <0.50 <3.0 75 68 COMP-9 B-16 through B-18 0.0-0.5 1/8/25 <2.9 8.3 250 0.52 <0.49 57 <0.30 16 45 11 <0.17 <0.98 62 <2.9 <0.49 <2.9 77 75 COMP-10 B-16 through B-18 1.5-2.0 1/8/25 <2.9 8.1 270 0.55 <0.49 61 <0.30 17 46 9.3 0.22 <0.98 70 <2.9 <0.49 <2.9 77 73 Construction Worker Direct Exposure 130 1.1 2,200 22 19 280 5 NA 22 14,000 150 0.65 1,500 63 1,700 1,800 3.5 370 110,000 Residential Direct Exposure 31 0.032 15,000 16 7.1 85,000 5 NA 23 3,100 80 0.67 390 820 390 390 0.78 390 23,000Commercial/Industrial Direct Exposure 470 0.14 220,000 230 100 360,000 5 NA 350 47,000 500 2.9 5,800 11,000 5,800 5,800 12 5,800 350,000

0.60 11 4 509 1.3 0.36 122 NA 15 29 24 0.26 1.3 57 0.058 0.80 0.56 112 149 500 500 10,000 75 100 2,500 NA 8,000 2,500 1,000 20 3,500 2,000 100 500 700 2,400 5,000 WET Testing Trigger Level (10 X STLC) 150 50 1,000 7.5 10 50 NA 800 250 50 2.0 3,500 200 10 50 70 240 2,500 15 5.0 100 0.75 1.0 5.0 5.0 80 25 5.0 0.20 350 20 1.0 5.0 7.0 24 250 TCLP Testing Trigger Level (20 X TCLP) NE 100 2,000 NE 20 100 NA NE NE 100 4.0 NE NE 20 100 NE NE NE NE 5.0 100 NE 1.0 5.0 NA NE NE 5.0 0.20 NE NE 1.0 5.0 NE NE NE Notes:Units are mg/kg unless indicated otherwise.Metals analyzed by Environmental Protection Agency methods 6010B and 7471A for mercury. -- = not analyzed.Shaded values= concentration exceeding trigger level for WET solubility analysis. ft bgs = feet below ground surface.Bold values = concentration equal to or above Construction Worker ESL and background level mg/kg = milligram per kilogram. <## = compound not identified at or above the laboratory reporting limit of ##. mg/L = milligram per liter.* Samples from borings B-1 and B-2 were collected from approximately 0.5-1.0 and 2.0-2.5 feet bgs due to the presence of approximately 6-inches of gravel on the ground surface. NE = not established.

NA = not applicable.
1 ESLs = Environmental Screening Levels, San Francisco Bay Regional Water Quality Control Board, 2025. TTLC = Total Threshold Limit Concentration.2 Background = Average Background Concentrations of Trace and Major Elements in California Soils, Kearney Foundation of Soil Science, March 1996. STLC = Solubility Threshold Limit Concentration.3 California and Federal Hazardous Waste [TTLC, STLC and TCLP] - California Code of Regulations Title 22. WET = soluble metals by Waste Extraction Test.4 Establishing Background Arsenic in Soil of the Urbanized San Francisco Bay Region, Dylan Duverge, December 2011. TCLP = Toxicity Characteristic Leaching Procedure.5 Indicates ESL for Chromium III (soluble) as there are no screening levels established for total chromium. TTLC = Total Threshold Limit Concentration.

Hazardous
Waste
Criteria 3
TCLP Threshold (mg/L)STLC (mg/L)TTLC
ESLs 1
Background 2
11/6/2025
-

Page 1600 of 1860 ends

Table 2: Analytical Results for Organochlorine Pesticides East County Service Center
Brentwood, CA
Sample ID
Sample Depths
(ft bgs) Sample Date 4,4'-DDD 4,4'-DDE 4,4'-DDT
Total DDD+
DDE+DDT Dieldrin Toxaphene Aldrin
B-1:0.5-1.0 0.5-1.0 8/5/24 <5.0 <5.0 <5.0 <5.0 <5.0 <100 <5.0 B-2:0.5-1.0 0.5-1.0 8/5/24 <5.0 11 <5.0 11 <5.0 <100 <5.0 B-3:0.0-0.5 0.0-0.5 8/5/24 <5.0 11 <5.0 11 <5.0 <100 <5.0 B-4:0.0-0.5 0.0-0.5 8/5/24 <5.0 1,000 270 1,270 <5.0 1,300 6.1 B-4:1.5-2.0 1.5-2.0 8/5/24 <5.0 77 <5.0 77 <5.0 <100 <5.0 B-5:0.0-0.5 0.0-0.5 8/5/24 <5.0 470 62 532 <5.0 480 <5.0 B-6:0.0-0.5 0.0-0.5 8/5/24 19 1,200 230 1,449 <5.0 1,400 18 B-6:1.5-2.0 1.5-2.0 8/5/24 <4.9 90 <4.9 90 <4.9 <98 <4.9 B-7:0.0-0.5 0.0-0.5 8/5/24 <5.0 15 <5.0 15 <5.0 <99 <5.0 B-8:0.0-0.5 0.0-0.5 8/5/24 15 1,100 140 1,255 <5.0 770 <5.0 B-8:1.5-2.0 1.5-2.0 8/5/24 <5.1 28 <5.1 28 <5.1 <100 <5.1 B-9:0.0-0.5 0.0-0.5 1/8/25 11 780 210 1,001 <5.1 <100 <5.1 B-9:1.5-2.0 1.5-2.0 1/8/25 <4.9 14 <4.9 14 <4.9 <98 <4.9 B-10:0.0-0.5 0.0-0.5 1/8/25 15 990 250 1,255 <4.9 <98 <4.9 B-10:1.5-2.0 1.5-2.0 1/8/25 <4.9 7.1 <4.9 7.1 <4.9 <98 <4.9 B-11:0.0-0.5 0.0-0.5 1/8/25 17 1,100 310 1,427 12 <98 <4.9 B-11:1.5-2.0 1.5-2.0 1/8/25 <5.0 21 5.9 26.9 <5.0 <99 <5.0 B-12:0.0-0.5 0.0-0.5 1/8/25 16 780 230 1,026 7.0 <100 <5.1 B-12:1.5-2.0 1.5-2.0 1/8/25 <5.0 9.7 <5.0 9.7 <5.0 <100 <5.0 B-13:0.0-0.5 0.0-0.5 1/8/25 18 1,200 330 1,548 8.8 <98 <4.9 B-13:1.5-2.0 1.5-2.0 1/8/25 <5.0 68 8.1 76.1 <5.0 <100 <5.0 B-14:0.0-0.5 0.0-0.5 1/8/25 15 870 270 1,155 6.5 <98 <4.9 B-14:1.5-2.0 1.5-2.0 1/8/25 <5.0 32 <5.0 32 <5.0 <99 <5.0 B-15:0.0-0.5 0.0-0.5 1/8/25 22 1,100 400 1,522 8.7 <100 <5.0 B-15:1.5-2.0 1.5-2.0 1/8/25 <5.0 20 <5.0 20 <5.0 <100 <5.0 B-16:0.0-0.5 0.0-0.5 1/8/25 18 960 280 1,258 8.0 <100 <5.0 B-16:1.5-2.0 1.5-2.0 1/8/25 <4.9 680 190 870 <4.9 <98 <4.9 B-17:0.0-0.5 0.0-0.5 1/8/25 17 700 160 877 <4.9 <98 <4.9 B-17:1.5-2.0 1.5-2.0 1/8/25 <5.0 <5.0 <5.0 <5.0 15 <99 <5.0 B-18:0.0-0.5 0.0-0.5 1/8/25 22 990 270 1,282 <5.0 <100 <5.0 B-18:1.5-2.0 1.5-2.0 1/8/25 <5.0 43 7.3 50.3 <5.0 <100 <5.0 9,600 9,300 8,500 NA 140 1,900 180
Residential Direct Exposure 2,300 2,000 1,900 NA 34 450 39 77,000 68,000 65,000 NA 1,200 15,000 1,300
1,000 8,000 5,000 1,400
Notes:

Units are micrograms per kilogram.

Samples were analyzed for organochlorine pesticides by U.S. Environmental Protection Agency Method 8081A. <xx = indicates constituent was not identified at or above the laboratory reporting limit of xx Shaded values = concentration exceeding California Hazardous Waste criteria.

Bold values = concentration exceeding Residential Direct Exposure ESL NA = not applicable.
ft bgs = feet below ground surface.

TTLC = Total Threshold Limit Concentration.

Other organochlorine pesticides that are not shown were not detected above laboratory reporting limits. See lab report. 1 ESLs = Environmental Screening Levels, San Francisco Bay Regional Water Quality Control Board, 2025. 2 The TTLC applys to the combined concentrations of DDD, DDE, and DDT.

ESLs 1
California Hazardous Waste Criteria - TTLC 1,000 2
Commercial/Industrial Direct Exposure
Construction Worker Direct Exposure
11/6/2025
-

Page 1601 of 1860 ends

Attachment D
Noise and Vibration Modeling Data

Page 1602 of 1860 ends

Construction Noise Modeling

Page 1603 of 1860 ends

East County Service Center Project Construction Noise
Demolition Site Preparation Grading Building Construction Paving Architectural Coating 50 (Reference
Distance) 84 82 84 83 81 74
25 90 88 90 89 87 80
60 83 81 82 81 80 72
100 78 76 78 77 75 68
130 76 74 75 75 73 66
180 73 71 72 72 70 63
200 72 70 72 71 69 62
300 69 67 68 67 66 58
330 68 66 67 67 65 58
400 66 64 65 65 63 56
500 64 62 64 63 61 54
600 63 61 62 61 60 52
650 62 60 61 61 59 52
1000 58 56 58 57 55 48
Table 1. Detailed Construction Noise Analysis, Summary of Results Noise Levels by Phase, dBA Leq
Distance (feet)

Page 1604 of 1860 ends

East County Service Center Project Construction Noise
Source Data:

Maximum
Sound
Level
(dBA) 1
Utilization
Factor 1,2
Leq Sound
Level (dBA)
Source 1: Dozer - Sound level (dBA) at 50 feet = 82 40% 78.0 Source 2: Concrete Saw - Sound level (dBA) at 50 feet = 90 20% 83.0 Calculated Data:

All Sources Combined - Lmax sound level (dBA) at 50 feet = 91 All Sources Combined - Leq sound level (dBA) at 50 feet = 84 Distance Between
Source and
Receiver (ft.)
Geometric
Attenuation
(dB)
Ground Effect
Attenuation (dB)
Calculated
Lmax Sound
Level (dBA)
Calculated Leq
Sound Level
(dBA)
15 10 0.0 101 95
25 6 0.0 97 90
50 0 0.0 91 84
80 -4 0.0 87 80
100 -6 0.0 85 78
150 -10 0.0 81 75
200 -12 0.0 79 72
250 -14 0.0 77 70
300 -16 0.0 75 69
350 -17 0.0 74 67
400 -18 0.0 73 66
500 -20 0.0 71 64
600 -22 0.0 69 63
700 -23 0.0 68 61
800 -24 0.0 67 60
1000 -26 0.0 65 58
2000 -32 0.0 59 52
FHWA Roadway Construction Noise Model (RCNM), Version 1.1, December 8, 2008; and/or "Transit Noise and Vibration Impact Assessment Manual", FTA Report No. 0123, September 2018; and/or "Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances;" BBN/EPA, December 31, 1971 Geometric attenuation based on 6 dB per doubling of distance.

Table 2. Detailed Construction Noise Analysis, Demolition

1. Obtained or estimated from:

2. Usage Factor = percentage of time equipment is operating in noisiest mode while in use Note: This calculation does not include the effects, if any, of local shielding from walls, topography or other barriers which may reduce sound levels further.

Page 1605 of 1860 ends

East County Service Center Project Construction Noise
Source Data:

Maximum
Sound
Level
(dBA) 1
Utilization
Factor 1,2
Leq Sound
Level (dBA)
Source 1: Dozer - Sound level (dBA) at 50 feet = 82 40% 78.0 Source 2: Tractor - Sound level (dBA) at 50 feet = 84 40% 80.0 Calculated Data:

All Sources Combined - Lmax sound level (dBA) at 50 feet = 86 All Sources Combined - Leq sound level (dBA) at 50 feet = 82 Distance Between
Source and
Receiver (ft.)
Geometric
Attenuation
(dB)
Ground Effect
Attenuation (dB)
Calculated
Lmax Sound
Level (dBA)
Calculated Leq
Sound Level
(dBA)
15 10 0.0 97 93
25 6 0.0 92 88
50 0 0.0 86 82
80 -4 0.0 82 78
100 -6 0.0 80 76
150 -10 0.0 77 73
200 -12 0.0 74 70
250 -14 0.0 72 68
300 -16 0.0 71 67
350 -17 0.0 69 65
400 -18 0.0 68 64
500 -20 0.0 66 62
600 -22 0.0 65 61
700 -23 0.0 63 59
800 -24 0.0 62 58
1000 -26 0.0 60 56
2000 -32 0.0 54 50
FHWA Roadway Construction Noise Model (RCNM), Version 1.1, December 8, 2008; and/or "Transit Noise and Vibration Impact Assessment Manual", FTA Report No. 0123, September 2018; and/or "Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances;" BBN/EPA, December 31, 1971 Geometric attenuation based on 6 dB per doubling of distance.

Table 3. Detailed Construction Noise Analysis, Site Preparation

1. Obtained or estimated from:

2. Usage Factor = percentage of time equipment is operating in noisiest mode while in use Note: This calculation does not include the effects, if any, of local shielding from walls, topography or other barriers which may reduce sound levels further.

Page 1606 of 1860 ends

East County Service Center Project Construction Noise
Source Data:

Maximum
Sound
Level
(dBA) 1
Utilization
Factor 1,2
Leq Sound
Level (dBA)
Source 1: Grader - Sound level (dBA) at 50 feet = 85 40% 81.0 Source 2: Tractor - Sound level (dBA) at 50 feet = 84 40% 80.0 Calculated Data:

All Sources Combined - Lmax sound level (dBA) at 50 feet = 88 All Sources Combined - Leq sound level (dBA) at 50 feet = 84 Distance Between
Source and
Receiver (ft.)
Geometric
Attenuation
(dB)
Ground Effect
Attenuation (dB)
Calculated
Lmax Sound
Level (dBA)
Calculated Leq
Sound Level
(dBA)
15 10 0.0 98 94
25 6 0.0 94 90
50 0 0.0 88 84
80 -4 0.0 83 79
100 -6 0.0 82 78
150 -10 0.0 78 74
200 -12 0.0 75 72
250 -14 0.0 74 70
300 -16 0.0 72 68
350 -17 0.0 71 67
400 -18 0.0 69 65
500 -20 0.0 68 64
600 -22 0.0 66 62
700 -23 0.0 65 61
800 -24 0.0 63 59
1000 -26 0.0 62 58
2000 -32 0.0 55 52
FHWA Roadway Construction Noise Model (RCNM), Version 1.1, December 8, 2008; and/or "Transit Noise and Vibration Impact Assessment Manual", FTA Report No. 0123, September 2018; and/or "Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances;" BBN/EPA, December 31, 1971 Geometric attenuation based on 6 dB per doubling of distance.

Table 4. Detailed Construction Noise Analysis, Grading

1. Obtained or estimated from:

2. Usage Factor = percentage of time equipment is operating in noisiest mode while in use Note: This calculation does not include the effects, if any, of local shielding from walls, topography or other barriers which may reduce sound levels further.

Page 1607 of 1860 ends

East County Service Center Project Construction Noise
Source Data:

Maximum
Sound
Level
(dBA) 1
Utilization
Factor 1,2
Leq Sound
Level (dBA)
Source 1: Tractor - Sound level (dBA) at 50 feet = 84 40% 80.0 Source 2: Tractor - Sound level (dBA) at 50 feet = 84 40% 80.0 Calculated Data:

All Sources Combined - Lmax sound level (dBA) at 50 feet = 87 All Sources Combined - Leq sound level (dBA) at 50 feet = 83 Distance Between
Source and
Receiver (ft.)
Geometric
Attenuation
(dB)
Ground Effect
Attenuation (dB)
Calculated
Lmax Sound
Level (dBA)
Calculated Leq
Sound Level
(dBA)
15 10 0.0 97 93
25 6 0.0 93 89
50 0 0.0 87 83
80 -4 0.0 83 79
100 -6 0.0 81 77
150 -10 0.0 77 73
200 -12 0.0 75 71
250 -14 0.0 73 69
300 -16 0.0 71 67
350 -17 0.0 70 66
400 -18 0.0 69 65
500 -20 0.0 67 63
600 -22 0.0 65 61
700 -23 0.0 64 60
800 -24 0.0 63 59
1000 -26 0.0 61 57
2000 -32 0.0 55 51
FHWA Roadway Construction Noise Model (RCNM), Version 1.1, December 8, 2008; and/or "Transit Noise and Vibration Impact Assessment Manual", FTA Report No. 0123, September 2018; and/or "Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances;" BBN/EPA, December 31, 1971 Geometric attenuation based on 6 dB per doubling of distance.

Table 5. Detailed Construction Noise Analysis, Building Construction

1. Obtained or estimated from:

2. Usage Factor = percentage of time equipment is operating in noisiest mode while in use Note: This calculation does not include the effects, if any, of local shielding from walls, topography or other barriers which may reduce sound levels further.

Page 1608 of 1860 ends

East County Service Center Project Construction Noise
Source Data:

Maximum
Sound
Level
(dBA) 1
Utilization
Factor 1,2
Leq Sound
Level (dBA)
Source 1: Tractor - Sound level (dBA) at 50 feet = 84 40% 80.0 Source 2: Concrete Mixer Truck - Sound level (dBA) at 50 feet = 79 40% 75.0 Calculated Data:

All Sources Combined - Lmax sound level (dBA) at 50 feet = 85 All Sources Combined - Leq sound level (dBA) at 50 feet = 81 Distance Between
Source and
Receiver (ft.)
Geometric
Attenuation
(dB)
Ground Effect
Attenuation (dB)
Calculated
Lmax Sound
Level (dBA)
Calculated Leq
Sound Level
(dBA)
15 10 0.0 96 92
25 6 0.0 91 87
50 0 0.0 85 81
80 -4 0.0 81 77
100 -6 0.0 79 75
150 -10 0.0 76 72
200 -12 0.0 73 69
250 -14 0.0 71 67
300 -16 0.0 70 66
350 -17 0.0 68 64
400 -18 0.0 67 63
500 -20 0.0 65 61
600 -22 0.0 64 60
700 -23 0.0 62 58
800 -24 0.0 61 57
1000 -26 0.0 59 55
2000 -32 0.0 53 49
FHWA Roadway Construction Noise Model (RCNM), Version 1.1, December 8, 2008; and/or "Transit Noise and Vibration Impact Assessment Manual", FTA Report No. 0123, September 2018; and/or "Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances;" BBN/EPA, December 31, 1971 Geometric attenuation based on 6 dB per doubling of distance.

Table 6. Detailed Construction Noise Analysis, Paving

1. Obtained or estimated from:

2. Usage Factor = percentage of time equipment is operating in noisiest mode while in use Note: This calculation does not include the effects, if any, of local shielding from walls, topography or other barriers which may reduce sound levels further.

Page 1609 of 1860 ends

East County Service Center Project Construction Noise
Source Data:

Maximum
Sound
Level
(dBA) 1
Utilization
Factor 1,2
Leq Sound
Level (dBA)
Source 1: Compressor (Air) - Sound level (dBA) at 50 feet = 78 40% 74.0 Calculated Data:

All Sources Combined - Lmax sound level (dBA) at 50 feet = 78 All Sources Combined - Leq sound level (dBA) at 50 feet = 74 Distance Between
Source and
Receiver (ft.)
Geometric
Attenuation
(dB)
Ground Effect
Attenuation (dB)
Calculated
Lmax Sound
Level (dBA)
Calculated Leq
Sound Level
(dBA)
15 10 0.0 88 84
25 6 0.0 84 80
50 0 0.0 78 74
80 -4 0.0 74 70
100 -6 0.0 72 68
150 -10 0.0 68 64
200 -12 0.0 66 62
250 -14 0.0 64 60
300 -16 0.0 62 58
350 -17 0.0 61 57
400 -18 0.0 60 56
500 -20 0.0 58 54
600 -22 0.0 56 52
700 -23 0.0 55 51
800 -24 0.0 54 50
1000 -26 0.0 52 48
2000 -32 0.0 46 42
FHWA Roadway Construction Noise Model (RCNM), Version 1.1, December 8, 2008; and/or "Transit Noise and Vibration Impact Assessment Manual", FTA Report No. 0123, September 2018; and/or "Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances;" BBN/EPA, December 31, 1971 Geometric attenuation based on 6 dB per doubling of distance.

Table 7. Detailed Construction Noise Analysis, Architectural Coating

1. Obtained or estimated from:

2. Usage Factor = percentage of time equipment is operating in noisiest mode while in use Note: This calculation does not include the effects, if any, of local shielding from walls, topography or other barriers which may reduce sound levels further.

Page 1610 of 1860 ends

Construction Haul Truck Noise Modeling

Page 1611 of 1860 ends

East County Service Center Haul Truck Noise
Table 1. Model Inputs
Road Name Haul Truck ADT
HT and Haul Trucks
%
Sand Creek Rd 94 100.00%
Brentwood Blvd 94 100.00%
Business Ctr Dr 94 100.00%
Technology Way 94 100.00%
Table 2. Model Outputs
Road Name Speed Limit (MPH)
Proposed Haul
Trucks
Modeled Haul
Truck Noise Level
(dBA Ldn) 1
Representative
Ambient
Measurement
Location
Measured Ambient
Noise Level (dBA
Ldn)
Combined
Measured Ambient
and Modeled Haul
Trucks Delta dB
Sand Creek Rd 35 94 53.0 LT2 63.5 63.9 0.4
Brentwood Blvd 40 94 53.7 LT3 62.6 63.1 0.5
Business Ctr Dr 25 94 52.2 LT2 63.5 63.8 0.3
Technology Way 25 94 52.2 LT2 63.5 63.8 0.3

1. Modeled noise levels are calculated at a distance of 50 feet.

Haul Trucks Only

Page 1612 of 1860 ends

Mechanical Equipment Noise Modeling

Page 1613 of 1860 ends

East County Service Center Project Mechanical Equipment Noise Roof-Top Mechanical Equipment Summary
Table 1. Model InputsEquipment Type
Raw Noise @
50 ft
(dB Leq) Quantity
Combined Noise
Level (dB)
Screen or
Room?
Attenuation
(dB)
Attenuated
Noise Level of
50 ft (dB) Data Source Notes:

AHU 75 2 78.0 Screen 1 5 73.0 H&K
Air handling units would be located on the rooftop of the building behind a perforated metal mechanica enclosure with an approximate height of 8 feet.

Source: Federal Transit Administration 2018, Hoover & Kieth 2000 Table 2. Model Outputs
Combined Noise Level at
50 feet
Distance To Receiver
(ft) 1
Distance
Attenuation 2
Estimated
Noise Level at
Receptor
240 13.6 59.4310 15.8 57.2
480 19.6 53.4
1 Google Earth overlay of the generator locations, and measured to the nearest off-site receptor2 Distance attenuation assumes hard ground conditions, or 6 dB of reduction per doubling of distance Hampton Inn Brentwood

73.0 1 A perferated metal enclosure would block mechanical equipment from view, resulting in about 5 dB of reduction. A sealed inclosured would result in about 10 dB of reduction.

Sensitive Receptor
Goddard School of BrentwoodSilvergate and Coppergate Apartments

Page 1614 of 1860 ends

Generator Noise Modeling

Page 1615 of 1860 ends

East County Service Center Emergency Generator Noise
Emergency Generator Summary
Generator Location
Proposed
Generator Size
Sound Pressure at 50
Feet
Screen/
Enclosure
Nearest
Receptor
Distance1
What is the closest
Sensative Receptor?
Distance
Decibel
Attenuation
(dB) 2
Screen/
Enclosure
Decibel
Attenuation
Sound Pressure
at nearest
Receptor
Rooftop 250 kW 82 Screen 3 240 Goddard School of Brentwood -14 -5 63 Source: Federal Transit Administration 2018, Hoover & Kieth 2000 1 Google Earth overlay of the generator locations, and measured to the nearest off-site receptor2 Distance attenuation assumes hard ground conditions, or 6 dB of reduction per doubling of distance3 A perferated metal enclosure would block mechanical equipment from view, resulting in about 5 dB of reduction. A sealed inclosured would result in about 10 dB of reduction.

Page 1616 of 1860 ends

Traffic Noise Modeling

Page 1617 of 1860 ends

East County Service Center Traffic Noise
Table 1. Model Inputs
Heavy Truck
% ADT
Heavy Truck
% ADT
Heavy Truck
% ADT
Heavy Truck
% ADT
Sand Creek Road 35 0.60 2452 0.60 2565 0.33 2779 0.33 3200 Brentwood Boulevard 40 0.74 24898 0.74 30026 0.92 32131 0.92 34079 Business Center Drive 125 2.50 0 2.50 312 0.16 0 0.16 652 Technology Way 125 2.50 0 2.50 312 0.16 0 0.16 652

1. ADT for this roadway was not provided by Traffic Engineers 2018 No Project 2018 With Project 2040 No Proejct 2040 With Proejct Roadway Speed (mph)

Page 1618 of 1860 ends

East County Service Center Traffic Noise
Table 2. Model Outputs, Direct Impacts Comparison - 2018 No Project and 2018 With Project Roadway Speed (mph)
Heavy Truck
%
2018 NP
ADT
2018 WP
ADT
2018 NP
dBA Ldn
2018 WP
dBA Ldn Delta dB
Sand Creek Road 135 0.60 2452 2565 62.6 63.8 1.2
Brentwood Boulevard 40 0.74 24898 30026 69.0 69.8 0.8
Business Center Drive 225 2.50 0 312 62.6 62.8 0.2
Technology Way 225 2.50 0 312 62.6 62.8 0.2
Table 3. Model Outputs, Cumulative Impacts Comparison - 2018 No Project and 2040 With Project Heavy Truck
% ADT
Heavy Truck
% ADT
Sand Creek Road 135 2.50 0 0.16 652 62.6 62.9 0.3
Brentwood Boulevard 40 0.74 24898 0.92 34079 69 70.5 1.5 Business Center Drive 225 2.50 0 0.16 652 62.6 62.8 0.2 Technology Way 225 2.50 0 0.16 652 62.6 62.8 0.2
Table 4. Model Outputs, Cumulative Impacts Comparison - 2040 No Project and 2040 With Project Roadway Speed (mph)
Heavy Truck
%
2040 NP
ADT
2040 WP
ADT
2040 NP
dBA Ldn
2040 WP
dBA Ldn Delta dB
Sand Creek Road 135 0.33 2779 3200 62.6 62.9 0.3
Brentwood Boulevard 40 0.92 32131 34079 70.2 70.5 0.3
Business Center Drive 225 0.16 0 652 62.6 62.8 0.2
Technology Way 225 0.16 0 652 62.6 62.8 0.2

1. Traffic data provided by the Traffic Engineers for Baseline conditions is 7 years old. To provided a more accurate comparison of Baseline No Project and Baseline with Project conditions, measured ambient noise levels (LT-3) were used when they exceeded modeled baseline (2018 NP) conditions.

1. Traffic data provided by the Traffic Engineers for Baseline conditions is 7 years old. To provided a more accurate comparison of Baseline No Project and Baseline with Project conditions, measured ambient noise levels (LT-3) were used when they exceeded modeled baseline (2018 NP) conditions.

1. Traffic data provided by the Traffic Engineers for Baseline conditions is 7 years old. To provided a more accurate comparison of Baseline No Project and Baseline with Project conditions, measured ambient noise levels (LT-3) were used when they exceeded modeled baseline (2018 NP) conditions.

2. ADT for this roadway was not available for the 2018 NP Condition. 1. Measured ambient noise levels (LT-3) are conservatively used to represent this modeling condition in the absence of Year 2018 NP (No Project) traffic data.
2040 WP
dBA Ldn Delta dB

2. ADT for this roadway was not available for the 2018 NP Condition. 1. Measured ambient noise levels (LT-3) are conservatively used to represent this modeling condition in the absence of Year 2018 NP (No Project) traffic data.

2. ADT for this roadway was not available for the 2018 NP Condition. 1. Measured ambient noise levels (LT-3) are conservatively used to represent this modeling condition in the absence of Year 2018 NP (No Project) traffic data.

Roadway Speed (mph)
2018 NP 2040 WP
2018 NP
dBA Ldn

Page 1619 of 1860 ends

Play Area Noise Modeling

Page 1620 of 1860 ends

East County Service Center Project Play Area Noise
Receiver/Noise Source
Reference
Noise Level
@ 50 feet,
Leq dBA1
Reference
Number of
Children
Playing1
Assumed
Number of
Children
Playing
Noise
Adjustment for
Number of
Children, dBA2
Reference
Distance, feet
Distance,
feet
Hard
or Soft
Site?
Noise
Adjustment
for Distance3
Play Noise
Levels,
dBA Leq
Silvergate Apartments 71.3 58 30 -2.9 50 295 Hard -15.4 53.0Coppergate Apartments 71.3 58 30 -2.9 50 300 Hard -15.6 52.87865 Brentwood Boulevard 71.3 58 30 -2.9 50 420 Hard -18.5 49.9Goddard School of Brentwood 71.3 58 30 -2.9 50 250 Hard -14.0 54.4Hampton Inn Brentwood 71.3 58 30 -2.9 50 700 Hard -22.9 45.51. Source data from Linda Vista Elementary School in San Diego during morning and lunchtime recess.2. Adjustment = 10 × log (assumed # children / reference # children); i.e., 10 × log (30 / 58)3. Assumes acoustically hard site/ground conditions with an attenuation rate of 6 dB per doubling of distance.

Operational Noise Analysis Table 1. Noise Levels Due to East County Service Center Play Area at the Nearest Sensitive Receptors

Page 1621 of 1860 ends

Attachment E
Traffic Impact Study

Page 1622 of 1860 ends

Traffic Impact Study
East County Service Center
July 14, 2025
Contra Costa County, California

Page 1623 of 1860 ends

East County Service Center TIS – Report i
Table of Contents
Executive Summary ..................................................................................................................................... 1 Project Overview...........................................................................................................................................................................1 Project Trip Summary .................................................................................................................................................................2 Vehicle Miles Traveled Summary...........................................................................................................................................2 Level of Service Summary.........................................................................................................................................................3 Existing Conditions..............................................................................................................................................................3 Existing plus Project Conditions.....................................................................................................................................4 Background Conditions.....................................................................................................................................................4 Background plus Project Conditions............................................................................................................................4 Queuing Analysis..........................................................................................................................................................................4 Additional Transportation Analyses Summary .................................................................................................................5 Pedestrian Impacts..............................................................................................................................................................5 Bicycle Impacts .....................................................................................................................................................................5 Transit Impacts......................................................................................................................................................................6 Site Access Management..................................................................................................................................................6 Internal Circulation..............................................................................................................................................................6 Parking .....................................................................................................................................................................................7

1.0 Introduction........................................................................................................................................... 8

1.1 Study Purpose ........................................................................................................................................................................8

1.2 Study Locations .....................................................................................................................................................................9

1.2.1 Study Intersections ...................................................................................................................................................9

1.3 Study Scenarios .....................................................................................................................................................................9

2.0 Study Methodology ............................................................................................................................13

2.1 Vehicle Miles Traveled Methodology .........................................................................................................................13

2.1.1 VMT Screening Criteria........................................................................................................................................ 13

2.1.2 VMT Standards........................................................................................................................................................ 14

2.2 Level of Service Methodology .......................................................................................................................................14

2.2.1 Signalized Intersections....................................................................................................................................... 15

2.2.2 Stop-Controlled Intersections........................................................................................................................... 17

2.2.3 Level of Service Standards.................................................................................................................................. 18

3.0 Existing Conditions .............................................................................................................................20

3.1 Existing Setting and Roadway System........................................................................................................................20

3.2 Existing Pedestrian Facilities...........................................................................................................................................21

3.3 Existing Bicycle Facilities ..................................................................................................................................................24

Page 1624 of 1860 ends

East County Service Center TIS – Report ii

3.4 Existing Transit Facilities...................................................................................................................................................27

3.5 Existing Traffic Volumes and Lane Configuration..................................................................................................29

3.6 Intersection Level of Service Analysis .........................................................................................................................29

4.0 Existing plus Project Conditions ........................................................................................................33

4.1 Vehicle Miles Traveled ......................................................................................................................................................33

4.2 Project Trip Generation ....................................................................................................................................................35

4.3 Project Trip Distribution and Assignment.................................................................................................................37

4.4 Intersection Level of Service Analysis .........................................................................................................................42

4.5 Intersection Queuing Analysis .......................................................................................................................................44

5.0 Background Conditions ......................................................................................................................48

5.2 Intersection Level of Service Analysis .........................................................................................................................51

6.0 Background plus Project Conditions .................................................................................................52

6.4 Intersection Level of Service Analysis .........................................................................................................................52

6.5 Intersection Queuing Analysis .......................................................................................................................................55

7.0 Additional Analysis..............................................................................................................................58

7.1 Alternative Modes of Transportation..........................................................................................................................58

7.1.1 Pedestrian Impacts ................................................................................................................................................ 58

7.1.2 Bicycle Impacts........................................................................................................................................................ 58

7.1.3 Transit Impacts........................................................................................................................................................ 59

7.2 Site Access, Internal Circulation, and Parking..........................................................................................................60

7.2.1 Site Access ................................................................................................................................................................ 60

7.2.2 Internal Circulation ................................................................................................................................................ 61

7.2.3 Parking ....................................................................................................................................................................... 62 List of Tables
Table 1: Level of Service Definitions for Signalized Intersections .................................................................................. 16 Table 2: Level of Service Definitions for Stop-Controlled Intersections ...................................................................... 18 Table 3: Existing Transit Facilities ................................................................................................................................................ 27 Table 4: Existing Conditions – Intersection AM and PM Peak Hour Level of Service Analysis Results ........... 30 Table 5: Project Trip Generation.................................................................................................................................................. 36

Page 1625 of 1860 ends

East County Service Center TIS – Report iii
Table 6: Existing plus Project Conditions – Intersection AM and PM Peak Hour Level of Service Analysis Results.......................................................................................................................................................................................... 43 Table 7: SimTraffic Analysis Input Parameters ....................................................................................................................... 44 Table 8: 95th Percentile Queueing Analysis – Existing and Existing plus Project Conditions .............................. 47 Table 9: 95th Background Conditions – Intersection AM and PM Peak Hour Level of Service Analysis Results ........................................................................................................................................................................................................ 51 Table 10: Background plus Project Conditions – Intersection Level of Service Analysis Results....................... 53 Table 11: 95th Percentile Queueing Analysis – Background and Background plus Project Conditions......... 57 List of Figures
Figure 1: Vicinity Map...................................................................................................................................................................... 11 Figure 2: Project Site Plan .............................................................................................................................................................. 12 Figure 3: Existing Conditions – Pedestrian Facilities............................................................................................................ 23 Figure 4: Existing Conditions – Bicycle Facilities ................................................................................................................... 26 Figure 5: Existing Conditions – Transit Facilities.................................................................................................................... 28 Figure 6: Existing Conditions – Intersection Lane Configuration and Control .......................................................... 31 Figure 7: Existing Conditions – Intersection AM and PM Peak Hour Traffic Volumes ........................................... 32 Figure 8: Project Trip Distribution............................................................................................................................................... 38 Figure 9: Project Trip Assignment (Inbound).......................................................................................................................... 39 Figure 10: Project Trip Assignment (Outbound) ................................................................................................................... 40 Figure 11: Existing plus Project Conditions – Intersection AM and PM Peak Hour Traffic Volumes ............... 41 Figure 12: Background Conditions – Intersection AM and PM Peak Hour Volumes ............................................. 50 Figure 13: Background plus Project Conditions – Intersection AM and PM Peak Hour Traffic Volumes....... 54

Page 1626 of 1860 ends

East County Service Center TIS – Report iv
List of Appendices
Appendix A: HCM Methodology
Appendix B: Transit Service Bus Route Schedules
Appendix C: Intersection Turning Movement Counts
Appendix D: Existing Conditions Intersection LOS Capacity Analysis Worksheets Appendix E: VMT Analysis Technical Memorandum (4/15/2025) Appendix F: Existing plus Project Conditions Intersection LOS Capacity Analysis Worksheets Appendix G: Existing and Existing Plus Project Conditions 95th Percentile Queueing Analysis Worksheets Appendix H: Calculations for Traffic Volume Projections of Background Conditions Appendix I: Background Conditions Intersection LOS Capacity Analysis Worksheets Appendix J: Background plus Project Conditions Intersection LOS Capacity Analysis Worksheets Appendix K: Background and Background Plus Project Conditions 95th Percentile Queueing Analysis Worksheets

Page 1627 of 1860 ends

East County Service Center TIS 1
Executive Summary
This report summarizes the results of a Traffic Impact Study (TIS) that was conducted for the proposed East County Service Center (hereinafter referred to as the “Project”), which is planned to be located on a vacant lot on the south side of Technology Way between Business Center Drive and Brentwood Boulevard, within the City of Brentwood, in Contra Costa County, California.

This TIS was conducted consistent with State and Contra Costa County guidelines and standards. This document was prepared following best professional practices and standards that assess the impacts of a proposed development on the transportation system, and as appropriate, recommends improvements to lessen or negate those impacts. Transportation analyses, as presented in this TIS, involve the evaluation of existing and anticipated future roadway conditions, including those with and without the proposed development, and recommend transportation improvements to offset both the impacts of the increase in future traffic volumes and the changes in traffic operations due to the development. The analysis herein is intended to assist public officials and developers in balancing interrelations between efficient traffic movements with necessary lane access.

Project Overview
The Project is located in Contra Costa County, within the City of Brentwood, California. The Project plans the construction of a service center that will total approximately 120,000 square feet (SF) of gross floor area (GFA) supporting 441 employees and will include a drop-off zone, and parking areas supporting 424 vehicle parking spaces through surface-level parking areas. Bicycle parking will be provided with a parking capacity for approximately 21 bicycles (17 covered bicycle parking spaces for County staff use and 4 bicycle parking spaces for public use). Access to the project site will consist of four (4) access points, two (2) of which will be located along Technology Way, one (1) that will be located along Brentwood Boulevard, and one (1) that will be located along Business Center Drive).

The purpose of this TIS is to evaluate the impacts on the transportation infrastructure due to the addition of traffic from the Project. The report includes a vehicle-miles traveled (VMT) analysis, intersection level of service (LOS) capacity analyses of key intersections, 95th percentile queuing analysis, and evaluations and recommendations concerning project site access and on-site circulation for vehicles, bicycles, and pedestrians.

Page 1628 of 1860 ends

East County Service Center TIS 2
To evaluate the impacts on the transportation infrastructure due to the addition of traffic from the Project, four (4) study intersections and four (4) access points were identified for analysis in coordination with County staff and evaluated during the weekday morning (AM) peak hour and weekday afternoon (PM) peak hour under four (4) study scenarios. The study intersections were evaluated under:
• Existing Conditions Without Project
• Existing Conditions plus Project
• Existing plus Approved Projects (“Background”) Conditions • Background Conditions plus Project
Project Trip Summary
Using the methodology presented in the Institute of Transportation Engineers (ITE) Trip Generation Manual, 11th Edition, the planned development is anticipated to generate approximately 3,285 ADT during a typical weekday, including 538 AM peak hour trips (403 In / 135 Out) and 401 PM peak hour trips (172 In / 229 Out).

Vehicle Miles Traveled Summary
As discussed in Section 4.1 of this report, following the California Environmental Quality Act (CEQA) and the Contra Costa Transportation Authority (CCTA) Growth Management Program Implementation Guidelines Appendix F, adopted in February 2021 (VMT Guidelines), a full VMT analysis was conducted for the Project.

Base Year 2018 and Cumulative Year 2040 VMT analyses were conducted to determine if the Project would exceed the CCTA VMT threshold under both Base and Cumulative conditions. The Project was identified to be located within the Travel Analysis Zone (TAZ) #30325. Thus, by coding the planned Project (consisting of an additional 441 employees within the identified TAZ) into the CCTA Travel Demand Model (TDM), Base Year 2018 and Cumulative Year 2040 VMT and Project VMT were identified for Without and With Project conditions.

The Base Year 2018 model run for home-work VMT per worker outputs consist of the following:
• Bay Area region-wide average
o Without Project = 15.75
o With Project = 15.88
C TJKM

Page 1629 of 1860 ends

East County Service Center TIS 3
• TAZ #30325 / Project VMT
o Bay Area region-wide average = 7.85
o TAZ #30325 / Project VMT = 7.43
The Cumulative Year 2040 model run for home-work VMT per worker outputs consist of the following:
• Bay Area region-wide average
o Without Project = 15.76
o With Project = 15.77
• TAZ #30325 / Project VMT
o Bay Area region-wide average = 7.56
o TAZ #30325 / Project VMT = 7.51
From the 2018 Base Year run, the Bay Area region-wide average VMT per worker is 15.75. For a project to not be significant, the 85% threshold is set at 0.85 x 15.75, which is 13.39. Similarly, the 85% threshold for the with-project scenario is 13.50.

The 2018 Base Year Plus Project model added 441 employees to TAZ #30325. For the TAZ, the resultant total VMT per worker with the project is 7.43. Since this value is lower than the threshold, the Project is deemed to have an insignificant impact on VMT.

From the 2040 Cumulative Year run, the Bay Area region-wide average VMT per worker is 15.76. For a project to not be significant, the 85% threshold is set at 0.85 x 15.76, which is 13.40. Similarly, the 85% threshold for the with-project scenario is 13.41.

The Cumulative Year resultant total VMT per worker with the project for the TAZ is 7.51. Since this value is lower than the threshold, the Project is deemed to have an insignificant impact on VMT.

Therefore, the East County Service Center Project is expected to generate commute-related VMT levels below the significance thresholds established by CCTA and CEQA guidelines. Based on this analysis, no significant VMT impacts would occur, and no design considerations are required.

Level of Service Summary
Existing Conditions
Under this scenario, all intersections operate at an acceptable LOS during both peak hours.

C TJKM

Page 1630 of 1860 ends

East County Service Center TIS 4
Existing plus Project Conditions
Under this scenario, all intersections are anticipated to operate at an acceptable LOS during both peak hours.

Background Conditions
Under this scenario, all intersections are anticipated to operate at an acceptable LOS during both peak hours.

Background plus Project Conditions
Under this scenario, all intersections are anticipated to operate at an acceptable LOS during both peak hours.

Queuing Analysis
Intersection queueing analysis was conducted for Existing, Existing plus Project, Background, and Background plus Project Conditions. Under the comparison of Existing and Existing plus Project Conditions, three (3) of the resulting 95th percentile queueing results exceed the available storage capacities. The observed spillbacks have been measured to range between less than 1 and 2 vehicle lengths and are anticipated to be resolved through the following measures:

1. Brentwood Boulevard / Technology Way – Northbound Left-Turn movement (NB-L) a. The proposed design consideration consists of the modification of the existing raised median to allow the extension of the turn pocket to increase the storage capacity.

2. Brentwood Boulevard / Sand Creek Road – Eastbound Right-Turn movement (EB-R) a. The queue exceedance is considered to be a minor spillback (<1 vehicle length) and is expected to be contained within the available spacing between the turn pocket western terminus and the eastern limit of an existing driveway 30 feet west of the western terminus of the turn pocket.

3. Business Center Drive / Sand Creek Road – Eastbound Left-Turn movement (EB-L) a. The proposed design consideration consists of the modification of the existing raised median to allow the extension of the turn pocket to increase the storage capacity.

Under the comparison of Background and Background plus Project Conditions, two (2) of the resulting 95th percentile queueing results exceed the available storage capacities. The observed spillbacks have been

Page 1631 of 1860 ends

East County Service Center TIS 5
measured to range between less than 1 and 2 vehicle lengths and are anticipated to be resolved through the following measures:

1. Brentwood Boulevard / Technology Way – NB-L
a. The proposed design consideration consists of the modification of the existing raised median to allow the extension of the turn pocket to increase the storage capacity.

2. Brentwood Boulevard / Sand Creek Road – EB-R
a. The queue exceedance is considered to be a minor spillback (<1 vehicle length) and is expected to be contained within the available spacing between the turn pocket western terminus and the eastern limit of an existing driveway 30 feet west of the western terminus of the turn pocket.

Additional Transportation Analyses Summary
Pedestrian Impacts
As discussed in Section 7.1.1 of this report, the Project is located in an area with ample pedestrian infrastructure and connectivity to off-site locations along the studied roadways. Identified pedestrian infrastructure includes marked pedestrian crosswalks, pedestrian push buttons at signalized locations, pedestrian countdown heads, and truncated domes.

The Project would include internal pedestrian pathways that would connect pedestrian users with the existing public pedestrian infrastructure along the project site fronting streets.

Project impacts on pedestrian facilities are expected to be less than significant.

Bicycle Impacts
As discussed in Section 7.1.2 of this report, the Project is located in an area with ample bicycle infrastructure along the study area, including nearby areas with Class II bike lanes and Class I Bike Paths, including the Marsh Creek Trail and the Barrington Trail.

The Project would include bicycle infrastructure on-site that would support and promote the use of bicycles, including bicycle parking areas for County staff and public use.

Project impacts on bicycle facilities are expected to be less than significant.

Page 1632 of 1860 ends

East County Service Center TIS 6
Transit Impacts
As discussed in Section 7.1.3 of this report, the Project is located in an area with several bus stop locations that connect users via various bus routes serviced by Tri Delta Transit. Three (3) bus routes have been identified to provide service to four (4) bus stops located within a ¼-mile walking distance from the project site.

The existing transit facilities within the project vicinity are serviced during the weekdays with headways ranging between 20 and 60 minutes and during the weekends with headways of approximately 60 minutes.

Project impacts on transit facilities are expected to be less than significant.

Site Access Management
As discussed in Section 7.2.1 of this report, access to the project site will consist of four (4) access points, two (2) of which will be located along Technology Way, one (1) that will be located along Brentwood Boulevard, and one (1) that will be located along Business Center Drive).

A peak hour analysis at the planned project site access points was conducted for Existing plus Project and Background plus Project conditions. The planned access points are anticipated to operate with acceptable LOS.

A 95th percentile queueing analysis at the planned project site access points was conducted for Existing plus Project and Background plus Project conditions. The planned access points are anticipated to operate with 95th percentile queues at public roadways (inbound queues) of approximately 1 to 3 vehicles in length.

Access management impacts of the planned development are considered to be less-than-significant.

Internal Circulation
As discussed in Section 7.2.2 of this report, internal vehicle circulation within the site would be separated into three (3) areas, including one area for public parking, one area for County staff-only parking, and a drop-off zone.

Internal circulation is planned to be provided by internal two-way vehicular pathways connecting public parking areas from the northern side of the project site to the eastern side of the project site. Internal circulation for staff-only parking areas is planned to be provided through an internal two-way vehicular pathway that runs from the western side of the project site to the southern side of the project site.

Page 1633 of 1860 ends

East County Service Center TIS 7
Pedestrian and bicycle circulation throughout the site would be facilitated via a series of new pedestrian pathways connecting pedestrians to and from the planned project buildings and parking areas onto the existing sidewalks fronting the project site (along Brentwood Boulevard, Technology Way, and Business Center Drive).

Internal circulation impacts of the Project are anticipated to be less than significant.

Parking
As discussed in Section 7.2.3 of this report, the planned parking supply for the Project is 424 vehicle parking spaces through surface-level parking areas. Bicycle parking will be provided with a parking capacity for approximately 21 bicycles (17 bicycle parking spaces for County staff and 4 bicycle parking spaces for public use).

As a development consisting of a new government building and consistent with the findings referenced from the ITE Parking Generation Manual 6th Edition (10/2023), the Project will be providing a parking supply above the minimum parking demand requirements. Therefore, the parking impacts of the Project are anticipated to be less than significant.

Page 1634 of 1860 ends

East County Service Center TIS 8

1.0 Introduction
This report summarizes the results of a Traffic Impact Study (TIS) that was conducted for the proposed East County Service Center (Project), which is planned to be located on a vacant lot on the south side of Technology Way between Business Center Drive and Brentwood Boulevard.

The Project plans the construction of a service center that will total 120,000 square feet (SF) of gross floor area (GFA), supporting 441 employees, and will include a drop-off zone and surface-level parking areas.

The Project is planned to support uses for 441 County staff members. The total parking supply is planned to support 424 vehicle parking spaces, among which 300 spaces are planned for County staff members, 44 parking spaces for County fleet vehicles, and 80 parking spaces for public use. Additionally, the Project plans to provide bicycle parking facilities totaling 21 parking spaces, consisting of 17 bicycle parking spaces for staff members and 4 bicycle parking spaces for public use. Access to the project site will consist of four (4) access points, two (2) of which will be located along Technology Way, one (1) that will be located along Brentwood Boulevard, and one (1) that will be located along Business Center Drive).

This chapter discusses the TIS's purpose, the Project study area, and the study scenarios analyzed.

Figure 1 shows the Project study area and the project site location.

Figure 2 shows the Project site plan.

1.1 Study Purpose
The purpose of this report is to provide summaries of changes in VMT and traffic impacts on the surrounding roadway network as a result of the Project. The VMT analysis is based on the methodology outlined in the Contra Costa County Transportation Analysis Guidelines (6/3/2020). An LOS analysis was conducted to determine the Project’s impacts on the surrounding roadway network and consistency with the Contra Costa County, City of Brentwood, and Contra Costa Transportation Authority (CCTA) plans and standards.

C TJKM

Page 1635 of 1860 ends

East County Service Center TIS 9

1.2 Study Locations

1.2.1 Study Intersections
TJKM evaluated traffic conditions at four (4) study intersections and four (4) future access points during the AM and PM peak hours for a typical weekday. The study intersections were selected based on TJKM’s working knowledge of the area and in coordination with Contra Costa County staff. It should be noted that the study intersections are located within the City of Brentwood and are subject to Brentwood standards.

The peak periods observed were 7:00 – 9:00 AM and 4:00 – 6:00 PM. The study intersections and their corresponding traffic controls are listed below:

1. Brentwood Boulevard / Technology Way (signalized)

2. Brentwood Boulevard / Sand Creek Road (signalized)

3. Business Center Drive / Sand Creek Road (signalized)

4. Business Center Drive / Technology Way (two-way stop-controlled)

5. Project Access #1 / Brentwood Boulevard (one-way stop-controlled) – new intersection

6. Project Access #2 / Business Center Drive (one-way stop-controlled) – new intersection

7. Project Access #3 / Technology Way (one-way stop-controlled) – new intersection

8. Project Access #4 / Technology Way (one-way stop-controlled) – new intersection Figure 1 shows the location of the study intersections.

Note: At the time of preparation of this study, no details about the access/egress configuration for the new intersections were available. For this study, project access #1 (intersection #5) is analyzed as an assumed right-in / right-out driveway due to the existence of a raised median along Brentwood Boulevard preventing NB-L inbound movements or EB-L outbound movements at this location. For the remaining project site access points, the analyzed conditions assume that all access points will operate as general-purpose driveways.

1.3 Study Scenarios
The roadway network operations within the Project study area were analyzed under the following scenarios:

1. Existing Conditions – This scenario evaluates the study locations based on existing traffic volumes, lane geometry, and traffic controls.

2. Existing plus Project Conditions – This scenario is identical to Existing Conditions, but with the addition of traffic from the Project.
._rrr;KM

Page 1636 of 1860 ends

East County Service Center TIS 10

3. Background Conditions – This scenario is similar to Existing Conditions but with the addition of traffic from all development projects that are included in the vicinity of the Project and which would contribute traffic to converging transportation facilities of the Project’s study area.

4. Background plus Project Conditions – This scenario is identical to Background Conditions but with the addition of traffic from the Project.

Page 1637 of 1860 ends

Figure 1: Vicinity Map
N
X Study Intersection Project Site
LEGEND
East County Service Center
• -
\
\
\ .
g:i r-----.----~
r---+------l Uve Oak
____ Jll rD
:::i
Brent.wood
Center
?
0 0

0. OJ
<
Q_
----+---J__::: Pa~
Village
Dr
C)
Ill I
~-
:::l
\)
7""
::i:
'<
Sand Creek Rd
Egr:et
Park
(D

Page 1638 of 1860 ends

East County Service Center TIS – Draft Report 11
Figure 2: Project Site Plan
The page has been left blank intentionally. The Figure is shown in the following page.

Page 1639 of 1860 ends

County Administrator’s Office – Capital Plan and Projects Update New East County Service Center
Site Plan – Future Development Opportunity
9 Public
Staff
FUTURE
BLDG
.. 3-LEVELS
32,400 GSF

FUTURE STAFF & FLEET

PARKING STRUCTURE
(100/LEVEL)

STAFF PARKING
r (26)

EAST COUNTY SERVICE CENTER
3-LEVELS
0 EB TRUE
NOITTH

Page 1640 of 1860 ends

East County Service Center TIS 13

2.0 Study Methodology
Traffic impacts related to the proposed Project were evaluated for both compliance with applicable regulatory documents and environmental significance as defined in the California Environmental Quality Act (CEQA). Per the Technical Advisory published by the Governor’s Office of Planning and Research (OPR), a quantitative VMT assessment forms the basis of the CEQA analysis for the proposed project. Effective as of July 1, 2020, intersection LOS can no longer be used to determine significant impacts for CEQA purposes.

However, the CEQA guidelines do not exclude the use of LOS analyses when determining consistency with plans and standards for jurisdictions or agencies, such as Contra Costa County, the City of Brentwood, or the CCTA.

2.1 Vehicle Miles Traveled Methodology
This study includes a quantitative analysis of VMT generated by the proposed project. California Senate Bill (SB) No. 743 is intended to reduce greenhouse gas emissions and particulates, encourage infill development and a diversity of uses instead of sprawl, and promote multi-modal transportation networks.

The VMT analysis is based on the methodology outlined in the Contra Costa County Transportation Analysis Guidelines (6/3/2020).

2.1.1 VMT Screening Criteria
The adopted Contra Costa County Transportation Analysis Guidelines (6/3/2020) include the following screening criteria for identifying projects that can be presumed to have a less-than-significant impact:
• Generate or attract fewer than 110 ADT.
• Projects of 10,000 SF or less of non-residential space, or 20 residential units or less, or otherwise generating less than 836 VMT per day.
• Residential, retail, office, or mixed-use projects proposed within ½-mile of an existing major transit stop or an existing stop along a high-quality transit corridor. • Residential projects (home-based VMT) at 15 percent or below the baseline Countywide home-based average VMT per capita, or employment projects (employee VMT) at 15 percent or below the baseline Bay Area average commute VMT per employee in areas with low VMT that incorporate similar VMTreducing features (i.e., density, mix of uses, transit accessibility). • Public facilities and government buildings.

C TJKM

Page 1641 of 1860 ends

East County Service Center TIS 14

2.1.2 VMT Standards
The state of California provides lead agencies with latitude in adopting standards of significance for evaluating VMT impacts associated with land use projects. As mentioned previously, the County has established VMT Guidelines with the following specific VMT thresholds:
o Residential Projects: 15 percent below the Countywide average home-based VMT per capita o Employment Projects (office, industrial, and institutional projects): 15 percent below the Bay Area average commute VMT per employee
o Regional Retail (>50,000 square feet): 15 percent below the Bay Area average total VMT per service population
o Mixed-Use Projects: 15 percent below the Countywide average total VMT per service population
If a project is found to have a significant impact in the base year, a cumulative year analysis is required. A project is found to have a significant cumulative impact if it increases total Countywide VMT.

2.2 Level of Service Methodology
LOS is a qualitative measure that describes operational conditions as they relate to the traffic stream and perceptions by motorists and passengers. The LOS generally describes these conditions in terms of such factors as speed and travel time, delays, freedom to maneuver, traffic interruptions, comfort, convenience, and safety. The operational LOS are given letter designations from A to F, with A representing the free-flow operating conditions and F representing the severely congested flow with high delays. Typically, LOS C is considered an ideal condition as it represents stable flow and efficient use of the transportation facility.

Intersections generally are the capacity-controlling locations for traffic operations on arterial and collector streets. The following sections provide a detailed study methodology based on the type of intersections.

Each of the study intersections was analyzed using Synchro, Version 12, software package using the methodology outlined in the Transportation Research Board’s (TRB) Highway Capacity Manual, 7 th Edition
(HCM 7). The LOS assessment under all study scenarios is based on current traffic controls unless otherwise noted.

Note: a few instances where HCM 7 methodology is not compatible include the following:

A. Intersections where signal phasing is not configured to NEMA standards.

C TJKM

Page 1642 of 1860 ends

East County Service Center TIS 15
B. Intersections where U-turn volumes exist.

For intersections where signal phasing is not configured to NEMA standards, the intersection analysis is represented using an older HCM methodology that is compatible with non-NEMA signal phasing. This methodology is HCM 2000.

For intersections where U-turn volumes exist, the HCM 7 methodology allows the analysis to ignore U-turn volumes. However, in place of ignoring peak turning volumes, the selected approach for this analysis consists of adding the U-turn volumes into left-turn volumes, such that the U-turn volumes are not ignored whilst analyzing an intersection LOS performance using HCM 7 methodology.

2.2.1 Signalized Intersections
The study intersections under traffic signal control are analyzed using the HCM 7 methodology described in Chapter 19. This methodology determines LOS based on average control delay per vehicle for the overall intersection and by approach, and a combination of control delay per vehicle and volume-to-capacity (v/c) for lane groups during the peak hour operating conditions.

Delay quantifies the increase in travel time due to traffic signal control; it is also a surrogate measure of driver discomfort and fuel consumption. The v/c ratio quantifies the degree to which a phase’s capacity is utilized by a lane group. A v/c ratio of 1.0 or more indicates cycle capacity is fully utilized and represents failure from a capacity perspective (just as a delay over 80 seconds per vehicle represents failure from a delay perspective).

Table 1 summarizes the relationship between the control delay and LOS for signalized intersections. The LOS assessments under all scenarios are based on current traffic controls and signal timings unless otherwise noted.

The LOS methodology for signalized intersections is described in detail in Appendix A.

Page 1643 of 1860 ends

East County Service Center TIS 16
Table 1: Level of Service Definitions for Signalized Intersections LOS Definition
Control Delay
Range (sec./veh.)
v/c Range
A
Very low control delay. This level is typically assigned when the v/c ratio is low and either progression is exceptionally favorable or the cycle length is short. Most vehicles arrive during the green phase.

Many vehicles do not stop at all.
≤ 10 ≤ 1.0
B
The v/c ratio is low. There is good progression, short cycle lengths, or both. More vehicles stop, causing higher levels of delay. ≤ 20 ≤ 1.0
C
Higher delays occur in favorable progression or due to a moderate cycle length, or both. Individual cycle failures (i.e., one or more queued vehicles are not able to depart as a result of insufficient capacity during a given cycle) may begin to appear. The number of vehicles stopping is still considered low to moderate, though many vehicles still pass through the intersection without stopping. ≤ 35 ≤ 1.0
D
The influence of congestion becomes more apparent. Longer delays may result from some combination of a high v/c ratio, ineffective progression, long cycle length, or high volumes. Many vehicles stop, and the proportion of vehicles not stopping declines. Individual cycle failures are noticeable.
≤ 55 ≤ 1.0
E
Typically considered the limit of acceptable delay. High delays usually indicate a very high v/c ratio, poor progression, long cycle lengths, and high volumes. Most cycles fail to clear the queue. ≤ 80 ≤ 1.0
F
Delays are unacceptable to most drivers. Conditions are considered oversaturated. Arrival flow rates exceed the capacity of the intersection (v/c above 1.0). Many individual cycle failures. Poor progression and long cycle lengths may also be contributing factors to higher delay.
> 80 > 1.0
Source: Transportation Research Board’s (TRB) Highway Capacity Manual, 7 th Edition
C TJKM

Page 1644 of 1860 ends

East County Service Center TIS 17

2.2.2 Stop-Controlled Intersections
The study intersections under one/two-way stop control (OWSC / TWSC) and all-way stop control (AWSC) are analyzed using the HCM 7 methodology described in Chapters 20 and 21, respectively. LOS ratings for stop-sign-controlled intersections are based on the average control delay expressed in seconds per vehicle.

At one- or two-way stop-controlled intersections, the control delay is calculated for each movement, not for the intersection as a whole. For approaches composed of a single lane, the control delay is computed as the average of all movements in that lane. Synchro 12 reports OWSC/TWSC delay by approach. The weighted average delay for the entire intersection is presented for all-way stop-controlled intersections.

Table 2 summarizes the relationship between delay and LOS for stop-controlled intersections. The delay ranges for stop-controlled intersections are lower than for signalized intersections, as drivers expect less delay at stop-controlled intersections.

The LOS methodology for stop-controlled intersections is described in detail in Appendix A.

Page 1645 of 1860 ends

East County Service Center TIS 18
Table 2: Level of Service Definitions for Stop-Controlled Intersections LOS Definition
Control Delay
Range (sec./veh.)
v/c Range
A
Usually, no conflicting traffic. Drivers can easily find gaps in traffic to maneuver. v/c is low.
≤ 10 ≤ 1.0
B
Occasionally some delay due to conflicting traffic. Drivers can find gaps in traffic. v/c is low.
≤ 15 ≤ 1.0
C
There is some noticeable delay due to conflicting traffic. Drivers are still able to find gaps in traffic.
≤ 25 ≤ 1.0
D
Drivers experience delays due to fewer gaps in traffic to maneuver. Lane group v/c creeps closer to 1.0.
≤ 35 ≤ 1.0
E
Delay approaches driver tolerance levels. Drivers will
occasionally find gaps in traffic to maneuver. Lane group v/c approaches 1.0.
≤ 50 ≤ 1.0
F Delay exceeds driver tolerance levels or v/c exceeds 1.0 or both. > 50 > 1.0 Source: Transportation Research Board’s (TRB) Highway Capacity Manual, 7 th Edition

2.2.3 Level of Service Standards
Contra Costa County
Although the level of service is no longer used for identifying impacts under CEQA, the level of service analysis is still used for determining consistency with adopted agency plans and standards. Where standards refer to significant environmental impacts, this analysis instead identifies these as significant inconsistencies with adopted plans.

The Contra Costa County Guidelines define an acceptable level of service to be LOS D in general, or LOS E on Routes of Regional Significance. Identifying improvements to address operational deficiencies would be required under the following circumstances:
• Project traffic would degrade operations from acceptable LOS D to unacceptable LOS E or F. If on a Route of Regional Significance, project traffic would degrade operations from acceptable LOS E to unacceptable LOS F.

C TJKM

Page 1646 of 1860 ends

East County Service Center TIS 19
• If an intersection is operating at unacceptable LOS, project traffic would increase delay by 5.0 seconds or more (whole intersection delay for signalized or all-way stop-controlled, or worst movement/approach for side-street stop-controlled).

City of Brentwood
The study intersections have been identified to be located within the City of Brentwood and in an urban setting. Consistent with the City of Brentwood’s Brentwood Boulevard Specific Plan (10/2015), a LOS D or a volume-to-capacity (V/C) ratio of 0.86 to 0.90 (for major arterials) and 0.81 to 0.85 (for minor arterials) are the thresholds of acceptability for intersections of basic routes within the City of Brentwood. Any signalized intersection operating worse than LOS D would be considered inconsistent with this standard unless the roadway is designated as a Route of Regional Significance (RORS), for which the LOS threshold would be LOS E.

The City of Brentwood General Plan (07/2014) identifies Brentwood Boulevard as an RORS and Sand Creek Road (between SR-4 and Brentwood Boulevard) as a proposed RORS roadway. Therefore, considering that Brentwood Boulevard is currently designated as an RORS facility, the following LOS standards were applied to the study intersections:

1. Brentwood Boulevard / Technology Way – LOS E

2. Brentwood Boulevard / Sand Creek Road – LOS E

3. Business Center Drive / Sand Creek Road – LOS E

4. Business Center Drive / Technology Way – LOS D

5. Project Access #1 / Brentwood Boulevard – LOS D

6. Project Access #2 / Business Center Drive – LOS D

7. Project Access #3 / Technology Way – LOS D

8. Project Access #4 / Technology Way – LOS D

Page 1647 of 1860 ends

East County Service Center TIS 20

3.0 Existing Conditions
This section describes existing conditions in the immediate project site vicinity, including roadway facilities and operations. Operational conditions are presented for the study intersections, including the results of LOS calculations.

3.1 Existing Setting and Roadway System
The characteristics of the main roadways in the Project’s vicinity are described below:

Sand Creek Road is a two-way roadway that is predominantly configured as a four-lane roadway with a predominant eastbound/westbound orientation. This roadway has a western terminus at its intersection with Deer Valley Road and an eastern terminus at its boundary with undeveloped land located approximately 800 feet east of the intersection with Garin Parkway. Sand Creek Road has a total extension of 5.4 miles, but a segment of roadway is observed to be currently under construction between the intersections of State Route 4 SB Ramps and Heidorn Ranch Road. Sand Creek Road is located east of the project site. This roadway is designated as a major arterial roadway in the City of Brentwood General Plan (07/2014). The analyzed segment along Sand Creek Road spans between Business Center Drive and Brentwood Boulevard. The analyzed roadway segment is characterized by a raised median dividing eastbound and westbound traffic. The analyzed roadway segment supports contiguous sidewalks on both sides of the street and Class II bike lanes for both travel directions. Parking is prohibited along the observed roadway segment. The observed roadway segment has a posted speed limit of 35 miles per hour.

Brentwood Boulevard is a two-way four-lane roadway with a predominant northbound/southbound and a partial eastbound/westbound orientation. This roadway has a southern terminus at its intersection with Byron Highway and a northern terminus at its intersection with Delta Road and Main Street, with a total extension of 6.4 miles. Brentwood Boulevard is located directly east of the project site. This roadway is designated as a major arterial roadway in the City of Brentwood General Plan (07/2014). The analyzed segment along Brentwood Boulevard spans between Technology Way and Sand Creek Road. The analyzed roadway segment is characterized by a raised median dividing northbound and southbound traffic. The analyzed roadway segment supports contiguous sidewalks on both sides of the street and Class II bike lanes for both travel directions. Parking is prohibited along the observed roadway segment. The posted speed limit in the area is 40 miles per hour.

Page 1648 of 1860 ends

East County Service Center TIS 21
Business Center Drive is a two-way two-lane roadway with a northbound/southbound orientation. This roadway has a southern terminus with undeveloped land located approximately 440 feet south of the intersection with Technology Way and a northern terminus at its intersection with Sand Creek Road, with a total extension of 0.2 miles. Business Center Drive Boulevard is located directly west of the project site. This roadway is not designated with a functional classification in the City of Brentwood General Plan (07/2014).

This roadway is characterized by being divided with a striped median. The roadway supports contiguous sidewalks on both sides of the street. Parking is allowed along the roadway extents. The roadway has a posted speed limit of 25 miles per hour.

Technology Way is a two-way two-lane roadway with an eastbound/westbound orientation. This roadway has a western terminus at its intersection with Business Center Drive and Taft Way and an eastern terminus at its intersection with Brentwood Boulevard, with a total extension of 0.2 miles. Technology Way is located directly north of the project site. This roadway is not designated with a functional classification in the City of Brentwood General Plan (07/2014). This roadway is characterized by being divided with a striped median.

The roadway supports contiguous sidewalks on both sides of the street. Parking is allowed along the roadway extents. The roadway has a posted speed limit of 25 miles per hour.

3.2 Existing Pedestrian Facilities
Walkability is defined as the ability to travel easily and safely between various origins and destinations without having to rely on automobiles or other motorized travel. The ideal “walkable” community includes wider sidewalks, a mix of land uses such as residential, employment, and shopping opportunities, a limited number of conflict points with vehicle traffic, and easy access to transit facilities and services.

Pedestrian facilities consist of marked crosswalks, concrete sidewalks, pedestrian signals, and off-street paths that provide safe and convenient routes for pedestrians to access destinations such as institutions, businesses, public transportation, and recreational facilities.

Existing pedestrian facilities are illustrated in Figure 3.

As shown in Figure 3, pedestrian connectivity throughout the study area is provided via existing sidewalks on the entire frontage of the project site along Technology Way, Business Center Drive, and Brentwood Boulevard. Pedestrian sidewalks within the project site vicinity provide users with ample connectivity to land uses in the vicinity of the project site. The observed roadway segments for this analysis support contiguous sidewalks on both sides of the street. At the study intersections, pedestrian facilities include marked

Page 1649 of 1860 ends

East County Service Center TIS 22
pedestrian crosswalks, pedestrian push buttons at signalized locations, pedestrian countdown heads, and truncated domes.

Page 1650 of 1860 ends

N
X Study Intersection
LEGEND
East County Service Center
Figure 3: Existing Conditions - Pedestrian Facilities
Sidewalk Marked Crosswalk
I
\
• - 11111111111
~ 0e;
~~
~-o Brentwood
Center
_J
Cl
!ll
::::!.
::::l
u
7-
;;,i;
'<
Sand Creek Rd
5 =
Egret
Park
(D

Page 1651 of 1860 ends

East County Service Center TIS 24

3.3 Existing Bicycle Facilities
Bicycle paths, lanes, and routes are typical examples of bicycle transportation facilities, which are defined by Caltrans as being in one of the following four (4) classes:
• Multi-Use Paths (Class I) – A path physically separated from motor vehicle traffic by an open space or barrier, and either within a highway or an independent right-of-way (ROW), used by bicyclists, pedestrians, joggers, skaters, and other non-motorized travelers. Class I paths are the most popular type of facility. Because the availability of uninterrupted ROW is limited, this type of facility may be difficult to locate and expensive to build, relative to other types of bicycle facilities, but inexpensive compared to new roadways. Ideal locations for bike paths are areas such as powerline easements, utility easements, canal banks, river levees, drainage easements, railroad or highway ROW, or regional community parks.
• Bike Lanes (Class II) – A portion of a roadway designated by striping and pavement markings for the preferential or exclusive use of bicyclists. Bike lanes are intended to promote an orderly flow of bicycle and vehicle traffic. This type of facility is established by using the appropriate striping, pavement legends, and signs.
• Bike Routes (Class III) – Bike routes are shared facilities between bicycle and motor vehicle traffic. They provide for specific bicycle demand and may be used to connect discontinuous segments of bike lanes.

In addition, bike routes are located on residential streets and rural roads. If the pavement width is sufficient and traffic volume/speeds warrant, an edge line may be painted to further delineate the bike route. Bike routes are identified with the G-93 Bike Route marker, but no striping or legends are required.
• Separated Bikeways (Class IV) – Separated bikeways are separated from motor vehicle traffic. A bikeway for the exclusive use of bicycles includes a separation required between the separated bikeway and the through vehicular traffic. The separation may include, but is not limited to, grade separation, flexible posts, inflexible posts, inflexible barriers, or on-street parking.

Existing bicycle facilities are illustrated in Figure 4.

As shown in Figure 4, the project site is connected to nearby areas with Class II bike lanes installed at roadway segments along Brentwood Boulevard (to the east of the project site), Sand Creek Road (to the north of the project site), and O’Hara Avenue (to the west of the project site).

Page 1652 of 1860 ends

East County Service Center TIS 25
Other bicycle facilities in the vicinity of the project site include two (2) Class I Bike Paths. These two facilities consist of the Marsh Creek Trail and the Barrington Trail. The Marsh Creek Trail extends for approximately

6.5 miles with a southern terminus at Creek Road and a northern terminus at its junction with the Big Break Regional Trail. This facility underpasses the intersection of O’Hara Avenue and Sand Creek Road (west of the project site), further extending on an eastbound/westbound orientation parallel and north of Sand Creek Road and the Brentwood Shopping Center, located directly north of Sand Creek Road and two (2) of the study intersections.

The Barrington Trail is located east of the project site and extends for approximately 0.7 miles with a southern terminus at Sycamore Park and a northern terminus at the Mokelumne Coast to Crest Trail. The closest location of this trail to the project site is at the intersection of Sand Creek Road with Bear Creek Drive.

Consistent with the City of Brentwood’s Brentwood Boulevard Specific Plan (10/2015), future bike facilities in the vicinity of the project site include Class II Bike Lanes within the Brentwood Boulevard Specific Plan Southern Area, which are planned to consist of bike lanes along Business Center Drive south of its current southern terminus and bike lanes connecting O’Hara Avenue and Brentwood Boulevard south of the project site.

Page 1653 of 1860 ends

Figure 4: Existing Conditions - Bicycle Facilities
N
X Study Intersection Marsh Creek Trail Barrington Trail 1 Class II Bike Lanes LEGEND
East County Service Center
...... -
• - - -
l j I
I :I co...,
Live I f'D k '-----::-11 ,...,.
~ l-------t---7 Oa
~ Park
Brentwood
Center
I
'--------1 ,1
0 "----t-----7 g_
0:,
<
Q..

Woodfield Ln
)
Egret
n-----~- -. Park
_J '-~~ ==::]
Village
Dr
(D

Page 1654 of 1860 ends

East County Service Center TIS 27

3.4 Existing Transit Facilities
Existing transit facilities are illustrated in Figure 5.

As shown in Figure 5, the project site lies in an area with several bus stop locations that connect users via various bus routes serviced by Tri Delta Transit. Bus stop locations identified in the vicinity of the project site include the following:
• SW corner of Sand Creek Rd. / Brentwood Blvd.
o Routes: 300X, 384, and 391
• NE corner of Sand Creek Rd. / Brentwood Blvd.
o Routes: 300X, 384, and 391
• NE corner of Brentwood Blvd. / Village Dr.
o Routes: 300X, 384, and 391
• NW corner of Brentwood Blvd. / Village Dr.
o Routes: 300X, 384, and 391
Table 3 summarizes the hours of operation for the identified transit service routes, main destinations, hours of operation, and headways.

Appendix B includes the identified transit service schedules and route maps.

Table 3: Existing Transit Facilities
Route From To
Weekdays Weekend
Hours Headway Hours Headway
300X Antioch BART Station Brentwood Park & Ride
4:20 AM
– 8:58
PM
~60 min. - -
384 Antioch BART Station Brentwood Park & Ride
6:59 AM
– 8:07
PM
~60 min. - -
391 Pittsburgh Center BART Brentwood Park & Ride
3:54 AM
– 1:24
AM
20 min. –
60 min.
6:24 AM – 9:45 PM 60 min.

Source: http://vwww.trideltatransit.com/
C TJKM

Page 1655 of 1860 ends

Figure 5: Existing Conditions - Transit Facilities
N
East County Service Center
X Study Intersection Bus Route 383 Bus Route 384 Bus Route 391 Bus Route 300X Bus Stop LEGEND
\ \
• - - -
Brentwood
Center
Technology j
-
0:,
fD Uve ~ 1-------+-----• Oak
~ Park
0 Q_
Vi llag'e
D,r
G'l
C:l
....,
s·
7:J
7-"
::E
'<
Sand Creek Rd
Egret
Park
(D

Page 1656 of 1860 ends

East County Service Center TIS 29

3.5 Existing Traffic Volumes and Lane Configuration
To determine the weekday morning AM and the weekday afternoon PM turning movement traffic volumes, intersection turning movement counts (TMC) of vehicles, bicycles, and pedestrians were collected at the study intersections. Count data was collected on Tuesday, January 28, 2025, during the weekday morning and weekday afternoon peak periods (7:00 – 9:00 AM and 4:00 – 6:00 PM, respectively).

The turning movement count data is included in Appendix C.

Existing lane geometries and traffic control at each study intersection are illustrated in Figure 6.

Existing AM and PM peak hour intersection turning movement volumes at each study intersection are illustrated in Figure 7.

3.6 Intersection Level of Service Analysis
Existing intersection lane configurations and turning movement volumes were used to calculate the LOS for the study intersections during the AM and PM peak hours. Traffic signal timings for signalized intersections were provided by the City of Brentwood.

The AM and PM peak hour intersection LOS results for Existing Conditions are summarized in Table 4.

Synchro worksheets for the AM and PM peak hour LOS analysis of the Existing Conditions scenario are provided in Appendix D.

As shown in Table 4, all study intersections operate at acceptable LOS during both AM and PM peak hours.

Page 1657 of 1860 ends

East County Service Center TIS 30
Table 4: Existing Conditions – Intersection AM and PM Peak Hour Level of Service Analysis Results No. Intersection Control
Type
Peak
Hour
Existing Conditions
Delay (sec / veh) Delay-Based
LOS
1 Brentwood Blvd. / Technology
Wy. Signal
AM 13.1 B
PM 17.5 B
2 Brentwood Blvd. / Sand Creek
Rd. Signal
AM 42.1 D
PM 43.3 D
3 Business Center Dr. / Sand
Creek Rd. Signal
AM 13.8 B
PM 19.5 B
4 Business Center Dr. /
Technology Wy. TWSC
AM 10.2 B (EB)
PM 10.5 B (EB)
Notes:
1) Signal = Signalized; OWSC = One-Way Stop Control; TWSC = Two-Way Stop Control 2) AM = A.M. Peak Hour; PM = P.M. Peak Hour
3) Delay measured in seconds per vehicle. For signalized and all-way stop-controlled intersections, the delay represents the average control delay for all turning movements. For one- and two-way stop-controlled intersections, the delay represents the worst average control delay for a given approach.
4) LOS = Level of Service
C TJKM

Page 1658 of 1860 ends

Figure 6: Existing Conditions - Intersection Lane Configuration and Control N
East County Service Center
X Study Intersection X New Study Intersection Project Site LEGEND
Traffic Signal Stop Sign
N
Marsh Creek
1 2 3
Sand Creek Rd
Brentwood Blvd
TJKM Transportation Consultants
Trip Assgn. IN
3:57 PM
1 2 3 4
5 6 7 8
0 (0) 20 (9)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 20 (9) 20 (9) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
Dwy. "A"
Brentwood Blvd.

Technology Wy.

Dwy. "B"
Technology Wy.

Dwy. "C"
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
141 (60)
0 (0)
161 (69)
0 (0) 81 (34) 60 (26)
0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
121 (52) 20 (9)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
0 (0) 20 (9) 0 (0)
60 (26)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 20 (9) 101 (43) 0 (0)
0 (0)
0 (0)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
141 (60)
0 (0)
0 (0) 20 (9) 0 (0)
0 (0) 0 (0)
0 (0)
20 (9)
81 (34)
0 (0)
20 (9) 40 (17)
0 (0)
0 (0) 0 (0) 0 (0)
0 (0) 0 (0)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.
60 (26)
60 (26)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
101 (43)
40 (17)
0 (0)
0 (0)
Trip Assgn. IN
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Ce
Wy./Techn
Brentwood Blvd. (N/S) & Dwy. "A"
(E/W)
Dwy. "B" (N/S) & Technology Wy.
(E/W)
Dwy. "C" (N/S) & Technology Wy.
(E/W)
Business Ce
(E/W)
4 8
(0)
(0)
0 (0)
(0)
(0)
(0)
(0)
(0)
(0)
) 0 (0)
Dwy. "D".
)
161 (69)
0 (0)
60 (26) 0 (0)
0 (0) 0 (0)
20 (9)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0)
) 0 (0)
0 (0)
0 (0)
0 (0)
Business Center Dr.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
Business Center Dr.
) 0 (0)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Technology Wy.
)
0 (0) 0 (0)
0 (0) 0 (0)
40 (17) 60 (26)
0 (0) 0 (0) 0 (0) 0 (0)
0 (0)
) 0 (0)
0 (0)
0 (0)
0 (0)
101 (43)
40 (17)
0 (0)
enter Dr. (N/S) & Sand Creek
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
N/S) & Technology Wy.

Business Center Dr. (N/S) & Dwy. "D".
(E/W)
TJKM Transportation Consultants
Trip Assgn. IN
3:57 PM
1 2 3 4
5 6 7 8
0 (0) 20 (9)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 20 (9) 20 (9) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
Dwy. "A"
Brentwood Blvd.

Technology Wy.

Dwy. "B"
Technology Wy.

Dwy. "C"
Dwy. "D".
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
141 (60)
0 (0)
161 (69)
0 (0)
0 (0) 81 (34) 60 (26) 0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
121 (52) 20 (9)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0) 0 (0)
0 (0)
0 (0) 20 (9) 0 (0)
0 (0)
0 (0)
0 (0)
60 (26)
0 (0)
Business Center Dr.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
Business Center Dr.
0 (0)
0 (0) 20 (9) 101 (43) 0 (0)
0 (0)
0 (0)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd. Technology Wy.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
141 (60)
0 (0)
0 (0) 20 (9) 0 (0) 0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
20 (9)
81 (34)
0 (0)
20 (9) 40 (17) 60 (26)
0 (0)
0 (0) 0 (0) 0 (0) 0 (0) 0 (0) 0 (0)
0 (0)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.
60 (26)
60 (26)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
101 (43)
40 (17)
0 (0)
0 (0)
0 (0)
Trip Assgn. IN
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
Brentwood Blvd. (N/S) & Dwy. "A"
(E/W)
Dwy. "B" (N/S) & Technology Wy.
(E/W)
Dwy. "C" (N/S) & Technology Wy.
(E/W)
Business Center Dr. (N/S) & Dwy. "D".
(E/W)
4 Key Map
5 6 7 8
Driveway A
Driveway D
Driveway C
Driveway B
+-
f
j
• .... ,. ....
- • .... , ....
-
•
i• ~ ~ r }
•
• • •
1 t t r ~ r ~ ~ ... ,J ... ,J ... ~ .... ~
• • - • (D

Page 1659 of 1860 ends

XX AM Peak Hour Volumes (XX) PM Peak Hour Volumes
Figure 7: Existing Conditions - Intersection AM & PM Peak Hour Traffic Volumes N
East County Service Center
X Study Intersection Project Site
LEGEND
D:\029 - 201 (East County Service Center TIS)\Analysis\Tables\Graphics Tool (36 Ints) v4.2.0 25SEPT2023 ) 0 (0)
Dwy. "C
D:\029 - 201 (East County Service Center TIS)\Analysis\Tables\Graphics Tool (36 Ints) v4.2.0 25SEPT2023 Marsh Creek
1 2 3
Sand Creek Rd
Brentwood Blvd
TJKM Transportation Consultants
Existing + Dwy Assumptions
1:45 PM
1 2 3 4 25 (25) 723 (608) 0 (0)
1 (11)
43 (53)
Existing + Dwy Assumptions 7 (19) 0 (0)
175 (155)
571 (441)
115 (150)
9 (74)
2 (4)
1 (11)
0 (0)
0 (0)
10 (26)
47 (57)
0 (0)
21 (41)
0 (0) 0 (0) 0 (0) 0 (0)
3 (7) 240 (165) 536 (565) 0 (0)
53 (58) 10 (19) 48 (53)
128 (97) 12 (14) 6 (11)
17 (10)
0 (0)
59 (73)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.

Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd. Technology Wy.
0 (0)
153 (219)
414 (559)
82 (85)
35 (38)
0 (0)
37 (50)
642 (772)
0 (0)
52 (41) 73 (114) 51 (79) 0 (0)
2 (5)
162 (192)
3 (4)
11 (16)
20 (45) 5 (4)
Business Center Dr.
0 (0)
152 (236) 492 (575) 7 (6)
0 (0)
0 (0)
17 (25)
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
4 Key Map
Driveway A
Driveway D
Driveway C
Driveway B
• - (D

Page 1660 of 1860 ends

East County Service Center TIS 33

4.0 Existing plus Project Conditions
This section describes the impacts of the Project at the study intersections and the surrounding roadway system. The Existing plus Project Conditions consist of existing traffic volumes (and roadway facilities) plus new traffic generated by the Project. Intersection lane geometry and traffic control for Existing plus Project Conditions are identical to Existing Conditions.

This section consists of two (2) analysis components:
• A VMT assessment of the Project (Section 4.1), and
• A LOS and 95th percentile queuing assessment of the study intersections (Sections 4.2 through 4.5).

The amount of traffic added to the roadway system by the Project is estimated using a three-step process, which includes the following:
• Trip Generation (Section 4.2) – Estimates the amount of traffic added to the roadway network, • Trip Distribution (Section 4.3) – Estimates the direction of travel to and from the project site, and • Trip Assignment (Section 4.3) – The new trips are assigned to specific street segments and intersection turning movements.

4.1 Vehicle Miles Traveled
Following the California Environmental Quality Act (CEQA) and the Contra Costa Transportation Authority (CCTA) Growth Management Program Implementation Guidelines Appendix F, adopted in February 2021 (VMT Guidelines), a full VMT analysis was conducted for the Project.

As an office/employment-generating land use, the Project is required under the CCTA VMT Guidelines to be analyzed under a home-work VMT per worker metric. Per the CCTA VMT Guidelines, a land use impact for a comparable land use development is deemed significant if “the project generated home-work VMT per worker is higher than 85% of the home-work VMT per worker in the subject municipality or unincorporated CCTA subregion (for areas outside municipalities) or 85% of the existing Bay Area regionwide average home-work VMT per worker, whichever is less stringent.” Base Year 2018 and Cumulative Year 2040 VMT analyses were conducted to determine if the Project would exceed the above-mentioned CCTA VMT threshold under both conditions. The Project was identified to be located within the Travel Analysis Zone (TAZ) #30325. Thus, by coding the planned Project (consisting of an additional 441 employees within the identified TAZ) into the CCTA Travel Demand Model (TDM), Base Year

Page 1661 of 1860 ends

East County Service Center TIS 34
2018 and Cumulative Year 2040 VMT and Project VMT were identified for Without and With Project conditions.

The Base Year 2018 model run for home-work VMT per worker outputs consist of the following:
• Bay Area region-wide average
o Without Project = 15.75
o With Project = 15.88
• TAZ #30325 / Project VMT
o Bay Area region-wide average = 7.85
o TAZ #30325 / Project VMT = 7.43
The Cumulative Year 2040 model run for home-work VMT per worker outputs consist of the following:
• Bay Area region-wide average
o Without Project = 15.76
o With Project = 15.77
• TAZ #30325 / Project VMT
o Bay Area region-wide average = 7.56
o TAZ #30325 / Project VMT = 7.51
From the 2018 Base Year run, the Bay Area region-wide average VMT per worker is 15.75. For a project to not be significant, the 85% threshold is set at 0.85 x 15.75, which is 13.39. Similarly, the 85% threshold for the with-project scenario is 13.50.

The 2018 Base Year Plus Project model added 441 employees to TAZ #30325. For the TAZ, the resultant total VMT per worker with the project is 7.43. Since this value is lower than the threshold, the Project is deemed to have an insignificant impact on VMT.

From the 2040 Cumulative Year run, the Bay Area region-wide average VMT per worker is 15.76. For a project to not be significant, the 85% threshold is set at 0.85 x 15.76, which is 13.40. Similarly, the 85% threshold for the with-project scenario is 13.41.

The Cumulative Year resultant total VMT per worker with the project for the TAZ is 7.51. Since this value is lower than the threshold, the Project is deemed to have an insignificant impact on VMT.

C TJKM

Page 1662 of 1860 ends

East County Service Center TIS 35
In both the Base Year 2918 and Cumulative Year 2040 scenarios, the project-generated VMT per worker is below the applicable 85% threshold of the Bay Area regional average. Therefore, the Project is expected to result in a less-than-significant impact under CEQA.

Appendix E includes a technical memorandum prepared by TJKM describing the Project’s VMT analysis.

4.2 Project Trip Generation
To estimate trips generated by the proposed development for the weekday morning (AM) and weekday afternoon (PM) peak periods as well as for weekday daily trips, TJKM utilized the published trip generation rates from the Institute of Transportation Engineers (ITE) Trip Generation Manual, 11th Edition, and consistent with the methodology published in ITE’s Trip Generation Handbook, 3rd Edition.

TJKM used published trip rates for the ITE Land Use Code 730 (Government Office Building) to establish the proposed land use. Land Use Code 730 presents trip information based on two land use intensity units:
building area and number of employees. As a conservative approach, the land use intensity selected for this analysis is the one representing the higher trip generation average rate value of the two intensities, as it would result in a higher trip generation estimate. The higher land-use intensity trip generation average rate for this scenario is represented by the number of employees.

The project is calculated to generate approximately 3,285 ADT during a typical weekday, including 538 AM peak hour trips (403 In / 135 Out) and 401 PM peak hour trips (172 In / 229 Out).

The Project trip generation is shown in Table 5.

C TJKM

Page 1663 of 1860 ends

East County Service Center TIS 36
Table 5: Project Trip Generation
Land Use ITE
Code
Land Use
Intensity Rate ADT AM Peak Hour PM Peak Hour
Rate (AM) Total In % Out % In Out Rate (PM) Total In % Out % In Out East County
Service
Center
(Government
Office
Building)
730 441 Employees 7.45 3,285 1.22 538 75% 25% 403 135 0.91 401 43% 57% 173 229 Total Vehicle Trips 3,285 538 403 135 401 172 229
Source - Institute of Transportation Engineers (ITE) Trip Generation Manual, 11th Edition, 09/2021.

Notes:

1. Rates sourced from (ITE) Trip Generation Manual, 11th Edition (09/2021) for Land Use Code (730). Rates include the average weekday rate and the generator rates for the AM and PM peak hours. No fitted curve equation is provided due to a small sample size.

Page 1664 of 1860 ends

East County Service Center TIS 37

4.3 Project Trip Distribution and Assignment
Trip distribution is a process of developing study assumptions that estimate the direction vehicular trips will arrive and depart the study site. Trip assignment estimates specific streets and turning movements at study intersections for project-related traffic.

Trip distribution and assignment assumptions for the Project were developed based on familiarity with the study area and engineering judgment. Trip distribution for vehicles is as follows:
• 35% along Brentwood Boulevard S/O Technology Way
• 25% along Brentwood Boulevard N/O Sand Creek Road
• 30% along Sand Creek Road W/O Business Center Drive
• 10% along Sand Creek Road E/O Brentwood Boulevard
• 30% along Brentwood Boulevard between Sand Creek Road and Technology Way • 45% along Technology Way between Business Center Drive and Brentwood Boulevard • 15% along Brentwood Boulevard W/O O’Hara Avenue
• 10% along O’Hara Avenue N/O Sand Creek Road
• 5% along O’Hara Avenue S/O Sand Creek Road
Figure 8 shows the Project trip distribution.

Figure 9 shows the inbound Project trip assignment.

Figure 10 shows the outbound Project trip assignment.

The Existing plus Project AM and PM peak hour traffic volumes were estimated by combining the Existing AM and PM peak hour traffic volumes and the Project’s trip assignment volumes.

Existing plus Project AM and PM peak hour intersection turning movement volumes at each study intersection are illustrated in Figure 11.

Page 1665 of 1860 ends

Figure 8: Project Trip Distribution
N
East County Service Center
X Study Intersection Project Site Trip Distribution
LEGEND
15%
D:\029 - 201 (East County Service Center TIS)\Analysis\Tables\Graphics Tool (36 Ints) v4.2.0 25SEPT2023 • -
Brentwood
Center
45°
chno • lo
Woodfield Ln
)
Village
Dr
(D

Page 1666 of 1860 ends

Figure 9: Project Trip Assignment (Inbound)
N
East County Service Center
Marsh Creek
1 2 3
Sand Creek Rd
Brentwood Blvd
TJKM Transportation Consultants
Trip Assgn. IN
3:57 PM
1 2 3 4
5 6 7 8
0 (0) 20 (9)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 20 (9) 20 (9) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
Dwy. "A"
Brentwood Blvd.

Technology Wy.

Dwy. "B"
Technology Wy.

Dwy. "C"
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
141 (60)
0 (0)
161 (69)
0 (0) 81 (34) 60 (26)
0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
121 (52) 20 (9)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
0 (0) 20 (9) 0 (0)
60 (26)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 20 (9) 101 (43) 0 (0)
0 (0)
0 (0)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
141 (60)
0 (0)
0 (0) 20 (9) 0 (0)
0 (0) 0 (0)
0 (0)
20 (9)
81 (34)
0 (0)
20 (9) 40 (17)
0 (0)
0 (0) 0 (0) 0 (0)
0 (0) 0 (0)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.
60 (26)
60 (26)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
101 (43)
40 (17)
0 (0)
0 (0)
Trip Assgn. IN
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Ce
Wy./Techn
Brentwood Blvd. (N/S) & Dwy. "A"
(E/W)
Dwy. "B" (N/S) & Technology Wy.
(E/W)
Dwy. "C" (N/S) & Technology Wy.
(E/W)
Business Ce
(E/W)
4 8
(0)
(0)
0 (0)
(0)
(0)
(0)
(0)
(0)
(0)
) 0 (0)
Dwy. "D".
)
161 (69)
0 (0)
60 (26) 0 (0)
0 (0) 0 (0)
20 (9)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0)
) 0 (0)
0 (0)
0 (0)
0 (0)
Business Center Dr.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
Business Center Dr.
) 0 (0)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Technology Wy.
)
0 (0) 0 (0)
0 (0) 0 (0)
40 (17) 60 (26)
0 (0) 0 (0) 0 (0) 0 (0)
0 (0)
) 0 (0)
0 (0)
0 (0)
0 (0)
101 (43)
40 (17)
0 (0)
enter Dr. (N/S) & Sand Creek
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
N/S) & Technology Wy.

Business Center Dr. (N/S) & Dwy. "D".
(E/W)
TJKM Transportation Consultants
Trip Assgn. IN
3:57 PM
1 2 3 4
5 6 7 8
0 (0) 20 (9)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 20 (9) 20 (9) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
Dwy. "A"
Brentwood Blvd.

Technology Wy.

Dwy. "B"
Technology Wy.

Dwy. "C"
Dwy. "D".
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
141 (60)
0 (0)
161 (69)
0 (0)
0 (0) 81 (34) 60 (26) 0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
121 (52) 20 (9)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0) 0 (0)
0 (0)
0 (0) 20 (9) 0 (0)
0 (0)
0 (0)
0 (0)
60 (26)
0 (0)
Business Center Dr.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
Business Center Dr.
0 (0)
0 (0) 20 (9) 101 (43) 0 (0)
0 (0)
0 (0)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd. Technology Wy.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
141 (60)
0 (0)
0 (0) 20 (9) 0 (0) 0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
20 (9)
81 (34)
0 (0)
20 (9) 40 (17) 60 (26)
0 (0)
0 (0) 0 (0) 0 (0) 0 (0) 0 (0) 0 (0)
0 (0)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.
60 (26)
60 (26)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
101 (43)
40 (17)
0 (0)
0 (0)
0 (0)
Trip Assgn. IN
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
Brentwood Blvd. (N/S) & Dwy. "A"
(E/W)
Dwy. "B" (N/S) & Technology Wy.
(E/W)
Dwy. "C" (N/S) & Technology Wy.
(E/W)
Business Center Dr. (N/S) & Dwy. "D".
(E/W)
25% 5%20% 15% 15%
5%
5%
5%
15%
35%
35%
10%
15%
40% 25% 10%
25%
5%
30%
10%
15% 5%
15%
30%
20%
5%
5% 5%
X Study Intersection Project Site Trip Distribution Trip Assignment LEGEND
XX% X%
40%
4 35%
35%
10% Key Map
5 6 7 8
X New Study Intersection
Driveway C
Driveway B
Driveway D
Driveway A
! -
- I
~~- ~. --+----I I
i-=1==+-~~ I
'
• ' r '
- • ' , '
-
+-- +--
~ • • ~
_____.
t,. .J t,. • ~ ... • ... "- ~
• - • (D

Page 1667 of 1860 ends

Figure 10: Project Trip Assignment (Outbound)
N
East County Service Center
D:\029 - 201 (East County Service Center TIS)\Analysis\Tables\Graphics Tool (36 Ints) v4.2.0 25SEPT2023 ) 0 (0)
Dwy. "C
D:\029 - 201 (East County Service Center TIS)\Analysis\Tables\Graphics Tool (36 Ints) v4.2.0 25SEPT2023 Marsh Creek
1 2 3
Sand Creek Rd
Brentwood Blvd
TJKM Transportation Consultants
Trip Assgn. OUT
3:58 PM
1 2 3 4
5 6 7 8
27 (46) 20 (34)
0 (0)
0 (0)
7 (11)
0 (0)
27 (46) 0 (0) 0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
7 (11)
0 (0) 0 (0) 0 (0)
Dwy. "A"
Brentwood Blvd.

Technology Wy.

Dwy. "B"
Technology Wy.

Dwy. "C"
0 (0)
7 (11)
0 (0)
34 (57)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 7 (11)
0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
7 (11) 0 (0) 0 (0)
0 (0)
20 (34)
0 (0)
14 (23)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
41 (69)
0 (0)
20 (34) 0 (0) 0 (0) 0 (0)
0 (0)
7 (11)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd.
0 (0)
7 (11)
27 (46)
7 (11)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 7 (11)
0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
34 (57)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
Trip Assgn. OUT
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Ce
Wy./Techn
Brentwood Blvd. (N/S) & Dwy. "A"
(E/W)
Dwy. "B" (N/S) & Technology Wy.
(E/W)
Dwy. "C" (N/S) & Technology Wy.
(E/W)
Business Ce
(E/W)
4 8
(0)
11)
0 (0)
(0)
(0)
(0)
(0)
(0)
11)
) 0 (0)
Dwy. "D".
)
0 (0)
0 (0)
7 (11) 0 (0)
0 (0) 54 (92)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0)
) 0 (0)
0 (0)
0 (0)
34 (57)
Business Center Dr.
0 (0)
14 (23)
0 (0)
0 (0)
0 (0)
Business Center Dr.
) 0 (0)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Technology Wy.
)
7 (11) 0 (0)
0 (0) 14 (23)
0 (0) 0 (0)
0 (0) 0 (0)
20 (34)
0 (0)
34 (57)
) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
enter Dr. (N/S) & Sand Creek
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
N/S) & Technology Wy.

Business Center Dr. (N/S) & Dwy. "D".
(E/W)
TJKM Transportation Consultants
Trip Assgn. OUT
3:58 PM
1 2 3 4
5 6 7 8
27 (46) 20 (34)
0 (0)
0 (0)
7 (11)
0 (0)
27 (46) 0 (0) 0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
7 (11)
0 (0) 0 (0) 0 (0)
Dwy. "A"
Brentwood Blvd.

Technology Wy.

Dwy. "B"
Technology Wy.

Dwy. "C"
Dwy. "D".
0 (0)
7 (11)
0 (0)
34 (57)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 7 (11) 0 (0)
0 (0) 0 (0) 54 (92)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0) 0 (0)
0 (0)
7 (11) 0 (0) 0 (0)
0 (0)
0 (0)
34 (57)
0 (0)
20 (34)
Business Center Dr.
0 (0)
14 (23)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
41 (69)
Business Center Dr.
0 (0)
20 (34) 0 (0) 0 (0) 0 (0)
0 (0)
7 (11)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd. Technology Wy.
0 (0)
7 (11)
27 (46)
7 (11)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 7 (11) 0 (0)
0 (0) 0 (0) 14 (23)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
0 (0) 0 (0) 0 (0) 0 (0)
20 (34)
0 (0)
34 (57)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
Trip Assgn. OUT
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
Brentwood Blvd. (N/S) & Dwy. "A"
(E/W)
Dwy. "B" (N/S) & Technology Wy.
(E/W)
Dwy. "C" (N/S) & Technology Wy.
(E/W)
Business Center Dr. (N/S) & Dwy. "D".
(E/W)
25%
5%
5%
35%
10%
15%
4 40%
40%
30%
5%
15% 20%
X Study Intersection Trip Distribution Trip Assignment
LEGEND
Project Site XX% X%
10%5%20%
5%
20%
35%
5%5%5%5%
30%
25%
15%
15%
10%
25%10%
5% Key Map
5 6 7 8
X New Study Intersection
Driveway C
Driveway B
Driveway D
Driveway A
!
L
• .... ,.
-
~ ~
~
... • ,J ...
• - ,( )I, •
....
•
,J ...
j
~
~
+-
~ ~
.... , ....
- ~
~ .... ~
(D

Page 1668 of 1860 ends

XX AM Peak Hour Volumes (XX) PM Peak Hour Volumes
Figure 11: Existing plus Project Conditions – Intersection AM & PM Peak Hour Traffic Volumes N
East County Service Center
D:\029 - 201 (East County Service Center TIS)\Analysis\Tables\Graphics Tool (36 Ints) v4.2.0 25SEPT2023 ) 0 (0)
Dwy. "C
D:\029 - 201 (East County Service Center TIS)\Analysis\Tables\Graphics Tool (36 Ints) v4.2.0 25SEPT2023 N
Marsh Creek
1 2 3
Sand Creek Rd
Brentwood Blvd
TJKM Transportation Consultants
Existing + P
1:45 PM
1 2 3 4
5 6 7 8 85 (51) 783 (634) 0 (0)
1 (11)
43 (53)
Existing + P
7 (19)
0 (0)
195 (164)
652 (475)
115 (150)
9 (74)
2 (4)
1 (11)
0 (0)
0 (0)
111 (69)
87 (74)
21 (41)
0 (0) 0 (0) 0 (0)
3 (7) 260 (174) 543 (576)
53 (58) 10 (19)
148 (106) 52 (31)
0 (0)
93 (130)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.

Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd.
0 (0)
160 (230)
441 (605)
89 (96)
35 (38)
0 (0)
178 (110)
642 (772)
0 (0)
72 (75) 93 (123) 152 (122) 0 (0)
2 (5)
169 (203)
60 (26)
838 (736)
3 (4)
25 (39)
5 (4)
0 (0)
0 (0)
0 (0)
0 (0)
61 (114)
0 (0)
0 (0) 0 (0) 0 (0)
0 (0)
159 (247) 512 (584) 7 (6)
0 (0) 146 (116) 121 (101)
0 (0) 0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
121 (52) 20 (9)
0 (0)
34 (35)
0 (0)
0 (0) 0 (0)
Dwy. "A"
Brentwood Blvd.

Technology Wy.

Dwy. "B"
Technology Wy.

Dwy. "C"
0 (0)
7 (11)
0 (0)
34 (57)
0 (0)
0 (0)
0 (0)
841 (923)
0 (0)
161 (69)
0 (0)
0 (0)
7 (11)
0 (0)
27 (46) 20 (9) 20 (9) 0 (0)
0 (0)
0 (0)
0 (0)
101 (137) 111 (116)
0 (0)
0 (0)
7 (11)
0 (0)
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Ce
Wy./Techn
Brentwood Blvd. (N/S) & Dwy. "A"
(E/W)
Dwy. "B" (N/S) & Technology Wy.
(E/W)
Dwy. "C" (N/S) & Technology Wy.
(E/W)
Business Ce
(E/W)
4 8
1 (11)
0 (0)
0 (0)
111 (69)
87 (74)
0 (0)
0 (0) 0 (0)
543 (576) 0 (0)
10 (19) 62 (76)
52 (31) 66 (37)
37 (44)
0 (0)
93 (130)
) 0 (0)
Business Center Dr.

Taft Wy.

Sand Creek Rd. Technology Wy.
)
) 0 (0)
Business Center Dr.
3 (4)
25 (39)
5 (4)
0 (0)
0 (0)
Business Center Dr.
0 (0) 0 (0)
) 7 (6)
0 (0)
0 (0)
51 (82)
121 (101) 0 (0)
0 (0) 54 (92)
20 (9)
0 (0)
34 (35)
0 (0)
) 0 (0)
Dwy. "D".
)
161 (69)
0 (0)
(0)
(0)
37)
(0)
(0)
11)
(0)
11)
0 (0)
enter Dr. (N/S) & Sand Creek
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
N/S) & Technology Wy.

Business Center Dr. (N/S) & Dwy. "D".
(E/W)
TJKM Transportation Consultants
Existing + P
1:45 PM
1 2 3 4
5 6 7 8 85 (51) 783 (634) 0 (0)
1 (11)
43 (53)
Existing + P
7 (19)
0 (0)
195 (164)
652 (475)
115 (150)
9 (74)
2 (4)
1 (11)
0 (0)
0 (0)
111 (69)
87 (74)
0 (0)
21 (41)
0 (0) 0 (0) 0 (0) 0 (0)
3 (7) 260 (174) 543 (576) 0 (0)
53 (58) 10 (19) 62 (76)
148 (106) 52 (31) 66 (37)
37 (44)
0 (0)
93 (130)
0 (0) 0 (0)
Technology Wy.

Brentwood Blvd.

Brentwood Blvd.

Business Center Dr.

Taft Wy.

Sand Creek Rd. Sand Creek Rd. Technology Wy.
0 (0)
160 (230)
441 (605)
89 (96)
35 (38)
0 (0)
178 (110)
642 (772)
0 (0)
72 (75) 93 (123) 152 (122) 0 (0)
2 (5)
169 (203)
60 (26)
838 (736)
Business Center Dr.
3 (4)
25 (39)
5 (4)
0 (0)
0 (0)
0 (0)
0 (0)
61 (114)
Business Center Dr.
0 (0)
0 (0) 0 (0) 0 (0) 0 (0)
0 (0)
159 (247) 512 (584) 7 (6)
0 (0)
0 (0)
51 (82)
0 (0) 146 (116) 121 (101) 0 (0)
0 (0) 0 (0) 54 (92)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
121 (52) 20 (9)
0 (0)
34 (35)
0 (0)
0 (0)
0 (0) 0 (0)
Dwy. "A"
Brentwood Blvd.

Technology Wy.

Dwy. "B"
Technology Wy.

Dwy. "C"
Dwy. "D".
0 (0)
7 (11)
0 (0)
34 (57)
0 (0)
0 (0)
0 (0)
841 (923)
0 (0)
161 (69)
0 (0)
0 (0)
0 (0)
0 (0)
16 (37)
0 (0)
0 (0)
7 (11)
0 (0)
27 (46) 20 (9) 20 (9) 0 (0)
0 (0)
0 (0)
0 (0)
101 (137) 111 (116)
0 (0)
0 (0)
7 (11)
0 (0)
Brentwood Blvd. (N/S) & Technology
Wy. (E/W)
Brentwood Blvd. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Sand Creek
Rd. (E/W)
Business Center Dr. (N/S) & Taft
Wy./Technology Wy. (E/W)
Brentwood Blvd. (N/S) & Dwy. "A"
(E/W)
Dwy. "B" (N/S) & Technology Wy.
(E/W)
Dwy. "C" (N/S) & Technology Wy.
(E/W)
Business Center Dr. (N/S) & Dwy. "D".
(E/W)
4 X Study Intersection
LEGEND
Project Site
Key Map
5 6 7 8
X New Study Intersection
Driveway A
Driveway D
Driveway C
Driveway B
-
- I
~~- ~ . ------+-------- I
~~~ I
'
• .... ,. ....
- • ' , ....
- ~
+-- +--
~. • • .~
t ~ ~ ~ ~ t _____. _____.
\. • ~ \. • ~ ... • . \.. ,.
• - • (D

Page 1669 of 1860 ends

East County Service Center TIS 42

4.4 Intersection Level of Service Analysis
The AM and PM peak hour intersection LOS results for Existing plus Project Conditions are summarized in Table 6.

The results for Existing Conditions are included for comparison purposes.

As shown in Table 6, all study intersections are anticipated to operate at acceptable LOS during both AM and PM peak hours.

Synchro worksheets for the AM and PM peak hour LOS analysis of the Existing plus Project Conditions scenario are provided in Appendix F.

Page 1670 of 1860 ends

East County Service Center TIS 43
Table 6: Existing plus Project Conditions – Intersection AM and PM Peak Hour Level of Service Analysis Results No. Intersection Control
Type
Peak
Hour
Existing Conditions
Control
Type
Existing Plus Project
Conditions
Change in
Delay (sec /
veh)
Significant? Delay (sec /
veh)
DelayBased LOSDelay (sec /
veh)
DelayBased LOS
1 Brentwood Blvd. /
Technology Wy. Signal AM 13.1 B
Signal 44.2 D 31.1 N
PM 17.5 B 23.5 C 6.0 N
2 Brentwood Blvd. /
Sand Creek Rd. Signal AM 42.1 D
Signal 47.7 D 5.6 N
PM 43.3 D 46.6 D 3.3 N
3 Business Center Dr. /
Sand Creek Rd. Signal AM 13.8 B
Signal 18.6 B 4.8 N
PM 19.5 B 23.9 C 4.4 N
4 Business Center Dr. /
Technology Wy. TWSC AM 10.2 B (EB) TWSC 13.4 B (WB) 3.2 N PM 10.5 B (EB) 12.4 B (EB) 1.9 N
5 Project Access #1 /
Brentwood Blvd. OWSC AM - -
OWSC 12.3 B (EB) 12.3 N
PM - - 11.7 B (EB) 11.7 N
6 Project Access #2 /
Business Center Dr. OWSC AM - -
OWSC 9.8 A (NB) 9.8 N
PM - - 9.8 A (NB) 9.8 N
7 Project Access #3 /
Technology Wy. OWSC AM - -
OWSC 9.7 A (NB) 9.7 N
PM - - 9.6 A (NB) 9.6 N
8 Project Access #4 /
Technology Wy. OWSC AM - -
OWSC 8.6 A (WB) 8.6 N
PM - - 8.9 A (WB) 8.9 N
Notes:
1) Signal = Signalized; OWSC = One-Way Stop Control; TWSC = Two-Way Stop Control 2) AM = A.M. Peak Hour; PM = P.M. Peak Hour
3) Delay measured in seconds per vehicle. For signalized and all-way stop-controlled intersections, the delay represents the average control delay for all turning movements.

For one- and two-way stop-controlled intersections, the delay represents the worst average control delay for a given approach. 4) LOS = Level of Service
5) "-" indicates that the analysis is not applicable.
* Intersections #5 through #8 are new project access points and are associated with the development of the Project, and thus not analyzed under "Without Project" conditions.

Page 1671 of 1860 ends

East County Service Center TIS 44

4.5 Intersection Queuing Analysis
A 95th percentile queueing analysis was conducted for Existing and Existing pus Project conditions to assess the potential levels of impacts on the analyzed study intersections and Project driveways. SimTraffic, Version 12, was used to simulate traffic conditions during the AM and PM peak hours.

Table 7 shows the parameters used for the queueing analysis simulation. Other parameters not detailed in the table were left to their default settings.

Table 7: SimTraffic Analysis Input Parameters
Input
Number of Intervals One (1) 15-minute-long seeding interval and one (1) 60-minute-long recording interval Number of Runs Five (5)
Each model run consisted of one seeding interval and one recorded interval. Each interval was set to a simulated duration of 15 minutes. A seeding interval was used to ensure that vehicles entering the network had enough time to propagate throughout the entire network. Foregoing seeding would lead to unrealistically low travel times, delays, and queues at the beginning of model runs that could skew the simulation results. The network reaches a normal state during the seeding period without affecting the results of the simulation.

The results of the 95th percentile queueing simulation comparison between Existing and Existing plus Project conditions for the study intersections are shown in Table 8.

As five (5) model runs were conducted for each of the analysis conditions, the results in the table represent the average of the five (5) runs. Reported queueing results are representative of 95th percentile queues and are presented in units of feet.

Furthermore, queueing analysis has also been conducted for the four (4) project site access points. The queueing analysis for the Project driveways has been prepared to evaluate the estimated internal queueing that the Project driveways would experience under Existing plus Project conditions.

C TJKM

Page 1672 of 1860 ends

East County Service Center TIS 45
The AM and PM peak hour 95th percentile queueing analysis SimTraffic worksheets for Existing and Existing plus Project Conditions are provided in Appendix G.

As shown in Table 8, 95th percentile queue spillbacks resulting from the addition of Project traffic were observed to occur at three (3) locations, which include the following:

1. Brentwood Boulevard / Technology Way – AM and PM Peak Hours ➢ Northbound Left-Turn movement (NB-L): For this turning movement, the addition of Project traffic would result in a spillback onto a dedicated through lane in the northbound direction during both the AM and PM peak hours. The observed 95th percentile queues are 130 feet in the AM peak hour (25 feet spillback) and 150 feet in the PM peak hour (45 feet spillback).

Although 95th percentile queues are representative of a worst-case scenario during peak hour conditions, the observed average queues for this turning movement are 129 feet in the AM peak hour (24 feet spillback) and 92 feet in the PM peak hour (below storage capacity). The observed spillbacks (of approximately one vehicle in length) would likely be fully contained within the available taper. However, the storage capacity of the turning lane would require an extension to accommodate the increase in traffic using this turn pocket. There is currently no identified improvement to this facility within the Contra Costa County 2045 General Plan (11/2024), nor the City of Brentwood’s General Plan (07/2014), or the City of Brentwood’s Brentwood Boulevard Specific Plan (10/2015). Existing right-of-way constraints would prevent the addition of a secondary NB-L turn lane at the intersection. The proposed design considerations consist of the modification of the existing raised median to allow the extension of the turn pocket to increase the storage capacity and updating the signal timing.

2. Brentwood Boulevard / Sand Creek Road – AM Peak Hour ➢ Eastbound Right-Turn movement (EB-R): For this turning movement, the addition of Project traffic would result in a spillback onto a dedicated through lane in the eastbound direction during the AM peak hour. The observed 95th percentile queues are 102 feet in the AM peak hour (2 feet spillback) and 131 feet in the PM peak hour (31 feet spillback). The observed 95th percentile queues (of less than one vehicle in length in the AM peak hour and approximately 1 vehicle in length in the PM peak hour) are representative of a worst-case scenario during peak hour conditions. These spillbacks would likely be fully contained within the available spacing between the existing turn-pocket western terminus and the eastern limit of an existing driveway C TJKM

Page 1673 of 1860 ends
← All documents from this meeting