Attachment B - Settlement Agreement with Workplans .pdf — Santa Maria City Council, October 21, 2025 (part 2 of 2)

Page 2 of 5 ends

Attachment B
Table C2
Historical Soil Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
Semi-
Volatile
Organic
Compounds
1,1,1-Trichloroethane
1,1,2-Trichloroethane
1,2-Dichloroethane
Cis-1,2-Dichloroethene
Dibromochloromethane
Tetrachloroethene (PCE)
Toluene
Total 1,2-Dichloroethene
(Cis and Trans)
Trans-1,2-Dichloroethene
Trichloroethene (TCE)
Vinyl Chloride
1,4-Dioxane (P-Dioxane)
Petroleum Hydrocarbons
(C04-C12) GRO
Petroleum Hydrocarbons
(C13-C22) DRO
Petroleum Hydrocarbons
(C23-C40) ORO
Total Petroleum
Hydrocarbons
Arsenic
Barium
Beryllium
Cadmium
Chromium, Total
Cobalt
Copper
Lead
Mercury
Molybdenum
Nickel
Vanadium
Zinc
71-55-6 79-00-5 107-06-2 156-59-2 124-48-1 127-18-4 108-88-3 540-59-0 156-60-5 79-01-6 75-01-4 123-91-1 PHCC4C12 PHCC13C22 PHCC23C40 TPH 7440-38-2 7440-39-3 7440-41-7 7440-43-9 7440-47-3 7440-48-4 7440-50-8 7439-92-1 7439-97-6 7439-98-7 7440-02-0 7440-62-2 7440-66-6 7 0.076 0.007 0.19 0.35 0.08 3.2 NS 0.65 0.085 0.0015 0.00017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 7,300 5.1 2.1 85 39 2.7 5,300 NS 600 6.1 0.15 22 2,000 1,200 NS NS 0.31 220,000 230 1,100 NS 350 47,000 320 190 5,800 11,000 5,800 350,000 7,200 6.3 45 78 290 33 4,700 NS 570 18 3.4 210 NS NS NS NS 0.98 3,000 27 51 NS 28 14,000 160 44 1,800 86 470 110,000 Sample Name Original
Sample Name
Sample
Date
Sample
Depth mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg Petroleum Hydrocarbons
Location
Metals
Analyte
CAS Number
Leaching to Groundwater ESL
Soil Direct Exposure Construction Worker: Any Land Use ESL Volatile Organic Compounds
Soil Direct Exposure Commercial/Industrial ESL
B221_5_032122 B221-5 03/21/2022 5-5 <0.0043 U<0.0043 U<0.0043 U 1.5 <0.0043 U 0.019 <0.0043 U NA <0.0043 U 10 <0.0043 U <0.1 U 160 660 3,100 NA <1.9 U 17 <0.47 U <0.23 U 2.4 0.81 2.1 1.6 0.02 J <0.47 U 1.4 5.3 5.9 B221_10_032122 B221-10 03/21/2022 10-10 <0.27 U <0.27 U <0.27 U 6 <0.27 U <0.27 U <0.27 U NA <0.27 U 4.8 <0.27 U <0.1 U <27 U <10 U <50 U NA 1.3 J 39 <0.49 U <0.25 U 5 3 4.4 2.8 0.04 J <0.49 U 6.9 8.5 9.6 B221_15_032122 B221-15 03/21/2022 15-15 <2 U <2 U <2 U 12 <2 U <2 U <2 U NA <2 U 75 <2 U <0.1 U <200 <9.9 U <50 U NA 1.1 J 26 <0.47 U <0.23 U 4.2 0.96 3.8 2.2 0.036 J <0.47 U 4.3 6 7.8 B221_20_032122 B221-20 03/21/2022 20-20 <2.8 U <2.8 U <2.8 U 2.4 J <2.8 U <2.8 U <2.8 U NA <2.8 U 97 <2.8 U <0.1 U <280 U <10 U <50 U NA <1.9 U 52 0.27 J <0.23 U 8.8 1.7 4.6 4.6 0.084 J <0.47 U 11 10 20 B221_25_032122 B221-25 03/21/2022 25-25 <0.15 U <0.15 U <0.15 U 1.8 <0.15 U <0.15 U <0.15 U NA <0.15 U 8.5 <0.15 U 0.049 J 47 <9.9 U <50 U NA <2 U 30 <0.49 U <0.25 U 5.6 2.8 4.6 2.8 0.032 J <0.49 U 5.9 12 12 B221_30_032122 B221-30 03/21/2022 30-30 <0.17 U <0.17 U <0.17 U 0.12 J <0.17 U <0.17 U <0.17 U NA <0.17 U 3.1 <0.17 U <0.099 U <17 U <9.9 U <50 U NA <1.9 U 10 <0.48 U <0.24 U 3 0.62 1.9 1.4 0.022 J <0.48 U 1.7 3 4.9 B221_35_032122 B221-35 03/21/2022 35-35 <2.3 U <2.3 U <2.3 U 2.5 <2.3 U <2.3 U <2.3 U NA <2.3 U 15 <2.3 U <0.1 U <230 U <10 U <50 U NA <1.9 U 27 <0.48 U <0.24 U 5.5 2.2 4.7 2.9 0.026 J <0.48 U 4.8 8.5 11 B221_40_032122 B221-40 03/21/2022 40-40 <0.32 U <0.32 U <0.32 U 0.75 <0.32 U <0.32 U <0.32 U NA <0.32 U 20 <0.32 U <0.1 U 19 J <10 U <50 U NA 4.5 53 0.49 <0.24 U 13 2.9 13 5 0.052 J 1.2 23 46 35 B221_45_032122 B221-45 03/21/2022 45-45 <0.19 U <0.19 U <0.19 U 0.31 <0.19 U <0.19 U <0.19 U NA <0.19 U 5.1 <0.19 U <0.099 U <19 U <9.9 U <50 U NA 4.6 36 <0.47 U <0.24 U 8.9 2 8.7 3.1 0.039 J 0.54 10 15 28 B221_50_032122 B221-50 03/21/2022 50-50 <0.19 U <0.19 U <0.19 U 0.33 <0.19 U <0.19 U <0.19 U NA <0.19 U 9.5 <0.19 U <0.1 U 8.2 J 9.7 J <50 U NA 4.3 51 <0.5 U <0.25 U 13 4.5 7.8 4.6 0.058 J 0.47 J 10 19 24 B222_5_032122 B222-5 03/21/2022 5-5 <0.0054 U<0.0054 U<0.0054 U<0.0054 U<0.0054 U<0.0054 U<0.0054 U NA <0.0054 U<0.0054 U<0.0054 U <0.1 U <0.54 U <10 U <50 U NA 1 J 14 <0.46 U <0.23 U 2.7 1.2 1.9 1.3 0.021 J 1.6 1.3 5.7 4.2 B222_10_032122 B222-10 03/21/2022 10-10 <0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U NA <0.0037 U<0.0037 U<0.0037 U <0.1 U <0.37 U <10 U <50 U NA <1.9 U 35 <0.48 U <0.24 U 4.6 2.6 3.3 2.2 0.066 J <0.48 U 4.5 6.5 7.1 B222_15_032122 B222-15 03/21/2022 15-15 <0.0036 U<0.0036 U<0.0036 U<0.0036 U<0.0036 U<0.0036 U<0.0036 U NA <0.0036 U<0.0036 U<0.0036 U <0.1 U <0.36 U <10 U <50 U NA <1.9 U 32 <0.48 U <0.24 U 5 0.77 3.9 2.6 0.033 J <0.48 U 4.7 5.6 8.3 B222_20_032122 B222-20 03/21/2022 20-20 <0.003 U <0.003 U <0.003 U <0.003 U <0.003 U <0.003 U <0.003 U NA <0.003 U<0.003 U<0.003 U <0.1 U <0.3 U 9.4 J <50 U NA <1.8 U 35 <0.46 U <0.23 U 4.9 1.6 5.9 3.5 0.042 J <0.46 U 5.2 7.1 14 B222_25_032122 B222-25 03/21/2022 25-25 <0.0032 U<0.0032 U<0.0032 U<0.0032 U<0.0032 U<0.0032 U<0.0032 U NA <0.0032 U<0.0032 U<0.0032 U <0.099 U <0.32 U <9.9 U <50 U NA <2 U 25 <0.49 U <0.24 U 4.4 1.3 4.4 3.2 0.036 J <0.49 U 6.5 6.3 12 B222_30_032122 B222-30 03/21/2022 30-30 <0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U NA <0.0039 U 0.009 <0.0039 U <0.1 U <0.39 U <10 U <50 U NA <1.9 U 9.1 <0.47 U <0.23 U 1.8 0.97 1.4 1.3 0.021 J <0.47 U 1.9 3 5.9 B222_35_032122 B222-35 03/21/2022 35-35 <0.0041 U<0.0041 U<0.0041 U 0.0041 <0.0041 U<0.0041 U<0.0041 U NA <0.0041 U 0.02 <0.0041 U <0.1 U <0.41 U <10 U <50 U NA <1.9 U 18 <0.48 U <0.24 U 4.4 0.48 2.9 2.1 0.023 J <0.48 U 4.5 5.1 8.8 B222_38_032122 B222-38 03/21/2022 38-38 <0.0044 U<0.0044 U<0.0044 U 0.022 <0.0044 U<0.0044 U<0.0044 U NA <0.0044 U 0.44 <0.0044 U NA <0.44 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B222_40_032122 B222-40 03/21/2022 40-40 <0.0038 U<0.0038 U<0.0038 U 0.014 <0.0038 U<0.0038 U<0.0038 U NA <0.0038 U 0.11 <0.0038 U <0.099 U <0.38 U <9.9 U <50 U NA 1.1 J 37 <0.48 U <0.24 U 6.3 5.3 7.2 4.2 0.032 J <0.48 U 7 16 18 B222_45_032122 B222-45 03/21/2022 45-45 <0.3 U <0.3 U <0.3 U 0.5 <0.3 U <0.3 U <0.3 U NA <0.3 U 16 <0.3 U <0.1 U <30 U <10 U <50 U NA 10 63 <0.49 U <0.24 U 13 3.6 17 7.2 0.051 J 1.3 17 27 51 B222_50_032122 B222-50 03/21/2022 50-50 <0.18 U <0.18 U <0.18 U 0.22 <0.18 U <0.18 U <0.18 U NA <0.18 U 3.6 <0.18 U <0.099 U <18 U <9.9 U <50 U NA 4.4 42 <0.5 U <0.25 U 9.4 3.1 6.9 5.5 0.032 J 0.36 J 9.8 17 21 B223_5_032122 B223-5 03/21/2022 5-5 <0.0023 U<0.0023 U<0.0023 U 0.018 <0.0023 U<0.0023 U<0.0023 U NA <0.0023 U 0.56 <0.0023 U <0.1 U <0.23 U 130 960 NA 2.6 40 <0.48 U <0.24 U 6.9 1.8 11 2.6 0.026 J 1.2 7.8 11 18 B223_10_032122 B223-10 03/21/2022 10-10 <0.0034 U<0.0034 U<0.0034 U 0.061 <0.0034 U<0.0034 U<0.0034 U NA <0.0034 U 0.39 <0.0034 U <0.1 U 0.14 J <10 U <50 U NA 1.7 J 38 <0.49 U <0.24 U 5.5 1.4 4.5 3.4 0.039 J <0.49 U 4.8 9.8 10 B223_15_032122 B223-15 03/21/2022 15-15 <0.18 U <0.18 U <0.18 U 0.35 <0.18 U <0.18 U <0.18 U NA <0.18 U 2.1 <0.18 U <0.099 U <18 U <9.9 U <50 U NA 1.3 J 24 <0.5 U <0.25 U 3.9 1.3 3.6 2.9 0.026 J <0.5 U 4 6 8.1 B223_20_032122 B223-20 03/21/2022 20-20 <0.16 U <0.16 U <0.16 U 0.37 <0.16 U <0.16 U <0.16 U NA <0.16 U 2.6 <0.16 U <0.1 U <16 U <10 U <50 U NA 1.1 J 25 <0.47 U <0.23 U 5 1.2 4.2 2.6 0.015 J <0.47 U 4.7 6.7 9.4 B223_25_032122 B223-25 03/22/2022 25-25 <0.19 U <0.19 U <0.19 U 1 <0.19 U <0.19 U <0.19 U NA <0.19 U 6.5 <0.19 U <0.1 U <19 U <10 U <50 U NA 1.1 J 22 <0.48 U <0.24 U 4.2 0.64 3.5 2.8 0.011 J <0.48 U 3.9 8.5 9 B223_30_032122 B223-30 03/22/2022 30-30 <0.16 U <0.16 U <0.16 U 0.24 <0.16 U <0.16 U <0.16 U NA <0.16 U 2.6 <0.16 U <0.1 U <16 U <10 U <50 U NA <2 U 15 <0.49 U <0.25 U 2.6 0.44 J 2.7 2.1 0.0092 J <0.49 U 2.7 4 5.8 B223_35_032122 B223-35 03/22/2022 35-35 <0.2 U <0.2 U <0.2 U 0.57 <0.2 U <0.2 U <0.2 U NA <0.2 U 3.3 <0.2 U <0.1 U <20 U <10 U <50 U NA <1.9 U 21 <0.48 U <0.24 U 4.8 2.2 3.5 2.8 <0.088 U <0.48 U 5.2 5.6 9.9 B223_40_032122 B223-40 03/22/2022 40-40 <0.21 U <0.21 U <0.21 U 1.4 <0.21 U <0.21 U <0.21 U NA <0.21 U 3.8 <0.21 U <0.1 U <21 U <10 U <50 U NA 1.4 J 36 <0.46 U <0.23 U 7.5 2 5.9 4.4 0.029 J <0.46 U 6.6 16 17 B223_45_032222 B223-45 03/22/2022 45-45 <0.22 U <0.22 U <0.22 U 0.42 <0.22 U <0.22 U <0.22 U NA <0.22 U 1.8 <0.22 U <0.1 U <22 U <10 U <50 U NA 4.7 90 <0.5 U <0.25 U 8.2 15 12 9.3 0.037 J 1 20 20 38 B223_50_032222 B223-50 03/22/2022 50-50 <0.0057 U<0.0057 U<0.0057 U 0.61 <0.0057 U<0.0057 U<0.0057 U NA <0.0057 U 1.9 <0.0057 U <0.1 U 0.51 J <10 U <50 U NA 4.1 36 <0.49 U <0.24 U 10 5 7.3 4.5 0.024 J 0.55 13 18 22 B224_5_032322 B224-5 03/23/2022 5-5 <0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U NA <0.0033 U<0.0033 U<0.0033 U <0.099 U <0.33 U <9.9 U <50 U NA 1 J 12 <0.5 U <0.25 U 2.6 0.65 2.1 1.3 <0.088 U 0.27 J 1.4 6 4.4 B224_10_032322 B224-10 03/23/2022 10-10 <0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U NA <0.0037 U<0.0037 U<0.0037 U <0.1 U <0.37 U <10 U <50 U NA 1.2 J 49 <0.46 U <0.23 U 5.5 2.8 4.1 2.8 0.023 J <0.46 U 6.2 8 9.6 B224_15_032322 B224-15 03/23/2022 15-15 <0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U NA <0.0033 U<0.0033 U<0.0033 U <0.1 U <0.33 U <10 U <50 U NA 1.5 J 42 <0.47 U <0.24 U 7.8 3.6 6.8 3.3 0.024 J <0.47 U 8.4 17 17 B224_20_032322 B224-20 03/23/2022 20-20 <0.0029 U<0.0029 U<0.0029 U<0.0029 U<0.0029 U<0.0029 U<0.0029 U NA <0.0029 U<0.0029 U<0.0029 U <0.099 U <0.29 U <9.9 U <50 U NA 0.94 J 55 <0.45 U <0.23 U 6.5 3.4 4.6 4.4 0.024 J <0.45 U 6.8 11 16 B224_25_032322 B224-25 03/23/2022 25-25 <0.003 U <0.003 U <0.003 U 0.0038 <0.003 U <0.003 U <0.003 U NA <0.003 U 0.056 <0.003 U <0.099 U <0.3 U <9.9 U <50 U NA <1.8 U 25 <0.46 U <0.23 U 4.9 1.7 3.1 2.2 0.017 J <0.46 U 4.8 9.3 11 B224_30_032322 B224-30 03/23/2022 30-30 <0.0031 U<0.0031 U<0.0031 U0.0025 J<0.0031 U<0.0031 U<0.0031 U NA <0.0031 U 0.018 <0.0031 U <0.1 U <0.31 U <10 U <50 U NA <1.8 U 8.9 <0.46 U <0.23 U 2.1 0.42 1.8 0.96 <0.083 U <0.46 U 1.5 3.1 4.1 B224_35_032322 B224-35 03/23/2022 35-35 <0.0025 U<0.0025 U<0.0025 U 0.0091 <0.0025 U<0.0025 U<0.0025 U NA <0.0025 U 0.074 <0.0025 U <0.1 U <0.25 U <10 U <50 U NA <2.4 U 22 <0.48 U <0.24 U 4 1.6 3.6 2.3 0.014 J <0.48 U 4.3 5.2 8.4 B224_40_032322 B224-40 03/23/2022 40-40 <0.0027 U<0.0027 U<0.0027 U 0.012 <0.0027 U<0.0027 U<0.0027 U NA <0.0027 U 0.1 <0.0027 U <0.1 U <0.27 U <10 U <50 U NA 3.7 54 <0.48 U <0.24 U 8.4 2.7 9.1 3.8 0.052 J 0.57 18 43 27 B224_45_032322 B224-45 03/23/2022 45-45 <0.0037 U<0.0037 U<0.0037 U 0.034 <0.0037 U<0.0037 U<0.0037 U NA <0.0037 U 0.26 E<0.0037 U NA 0.21 J NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B224_46.5_032322 B224-46.5 03/23/2022 46.5-46.5 <0.0049 U<0.0049 U<0.0049 U<0.0049 U<0.0049 U<0.0049 U<0.0049 U NA <0.0049 U<0.0049 U<0.0049 U <0.099 U <0.49 U <9.9 U <50 U NA 7.3 85 <0.47 U <0.23 U 14 5.9 17 6.1 0.038 J 1.3 20 29 54 B224_50_032322 B224-50 03/23/2022 50-50 <0.0029 U<0.0029 U<0.0029 U 0.023 <0.0029 U<0.0029 U<0.0029 U NA <0.0029 U 0.57 <0.0029 U <0.1 U 0.16 J <10 U <50 U NA 4.6 51 <0.49 U <0.25 U 98 4.7 8.2 4.1 0.019 J 0.62 11 19 23 2022 Soil Investigation
B221
B222
B223
B224

Page 3 of 5 ends

Attachment B
Table C2
Historical Soil Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
Semi-
Volatile
Organic
Compounds
1,1,1-Trichloroethane
1,1,2-Trichloroethane
1,2-Dichloroethane
Cis-1,2-Dichloroethene
Dibromochloromethane
Tetrachloroethene (PCE)
Toluene
Total 1,2-Dichloroethene
(Cis and Trans)
Trans-1,2-Dichloroethene
Trichloroethene (TCE)
Vinyl Chloride
1,4-Dioxane (P-Dioxane)
Petroleum Hydrocarbons
(C04-C12) GRO
Petroleum Hydrocarbons
(C13-C22) DRO
Petroleum Hydrocarbons
(C23-C40) ORO
Total Petroleum
Hydrocarbons
Arsenic
Barium
Beryllium
Cadmium
Chromium, Total
Cobalt
Copper
Lead
Mercury
Molybdenum
Nickel
Vanadium
Zinc
71-55-6 79-00-5 107-06-2 156-59-2 124-48-1 127-18-4 108-88-3 540-59-0 156-60-5 79-01-6 75-01-4 123-91-1 PHCC4C12 PHCC13C22 PHCC23C40 TPH 7440-38-2 7440-39-3 7440-41-7 7440-43-9 7440-47-3 7440-48-4 7440-50-8 7439-92-1 7439-97-6 7439-98-7 7440-02-0 7440-62-2 7440-66-6 7 0.076 0.007 0.19 0.35 0.08 3.2 NS 0.65 0.085 0.0015 0.00017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 7,300 5.1 2.1 85 39 2.7 5,300 NS 600 6.1 0.15 22 2,000 1,200 NS NS 0.31 220,000 230 1,100 NS 350 47,000 320 190 5,800 11,000 5,800 350,000 7,200 6.3 45 78 290 33 4,700 NS 570 18 3.4 210 NS NS NS NS 0.98 3,000 27 51 NS 28 14,000 160 44 1,800 86 470 110,000 Sample Name Original
Sample Name
Sample
Date
Sample
Depth mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg Petroleum Hydrocarbons
Location
Metals
Analyte
CAS Number
Leaching to Groundwater ESL
Soil Direct Exposure Construction Worker: Any Land Use ESL Volatile Organic Compounds
Soil Direct Exposure Commercial/Industrial ESL
B225_5_032322 B225-5 03/23/2022 5-5 <0.0045 U<0.0045 U<0.0045 U<0.0045 U<0.0045 U<0.0045 U<0.0045 U NA <0.0045 U<0.0045 U<0.0045 U <0.099 U <0.45 U <9.9 U <50 U NA 2.7 38 <0.47 U <0.24 U 7.8 1.7 3.3 3.2 0.01 J 0.32 J 4.8 15 8.7 B225_10_032322 B225-10 03/23/2022 10-10 <0.0044 U<0.0044 U<0.0044 U<0.0044 U<0.0044 U<0.0044 U<0.0044 U NA <0.0044 U0.0026 J<0.0044 U <0.1 U <0.44 U <10 U <50 U NA 1.8 J 33 <0.48 U <0.24 U 5.2 0.39 J 2.5 2.6 0.018 J <0.48 U 3.8 9.1 5.7 B225_15_032322 B225-15 03/23/2022 15-15 <0.0057 U<0.0057 U<0.0057 U<0.0057 U<0.0057 U<0.0057 U<0.0057 U NA <0.0057 U0.0031 J<0.0057 U <0.1 U <0.57 U <10 U <50 U NA 1.3 J 37 <0.46 U <0.23 U 7.7 1.1 4.7 3.2 0.019 J <0.46 U 5.8 10 13 B225_20_032322 B225-20 03/23/2022 20-20 <0.0036 U<0.0036 U<0.0036 U 0.0063 <0.0036 U<0.0036 U<0.0036 U NA <0.0036 U 0.026 <0.0036 U <0.1 U <0.36 U <10 U <50 U NA <2 U 27 <0.5 U <0.25 U 6 8.3 5 2.2 0.019 J <0.5 U 7.8 14 14 B225_22_032322 B225-22 03/23/2022 22-22 <0.0034 U<0.0034 U<0.0034 U 0.0058 <0.0034 U<0.0034 U<0.0034 U NA <0.0034 U 0.018 <0.0034 U NA <0.34 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B225_25_032322 B225-25 03/23/2022 25-25 <0.0034 U<0.0034 U<0.0034 U<0.0034 U<0.0034 U<0.0034 U<0.0034 U NA <0.0034 U0.0029 J<0.0034 U <0.099 U <0.34 U <9.9 U <50 U NA <1.9 U 22 <0.49 U <0.24 U 7 1.8 3.5 2.3 0.017 J <0.49 U 4.7 6.7 10 B225_30_032322 B225-30 03/23/2022 30-30 <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U NA <0.004 U0.0019 J<0.004 U <0.099 U <0.4 U <9.9 U <50 U NA <1.9 U 7.6 <0.46 U <0.23 U 2.8 2.9 1.7 1.1 <0.09 U <0.46 U 1.8 2.6 4 B225_35_032322 B225-35 03/23/2022 35-35 <0.0026 U<0.0026 U<0.0026 U 0.019 <0.0026 U<0.0026 U<0.0026 U NA <0.0026 U 0.078 <0.0026 U <0.1 U <0.26 U <10 U <50 U NA <2 U 21 <0.49 U <0.25 U 6.5 0.68 4 2.6 0.013 J <0.49 U 4.4 6.3 9.7 B225_40_032322 B225-40 03/23/2022 40-40 <0.0028 U<0.0028 U<0.0028 U 0.023 <0.0028 U<0.0028 U<0.0028 U NA <0.0028 U 0.082 <0.0028 U <0.1 U <0.28 U <10 U <50 U NA 3.4 68 1 <0.24 U 44 6.1 15 <0.48 U 0.28 5.8 35 190 38 B225_45_032322 B225-45 03/23/2022 45-45 <0.0037 U<0.0037 U<0.0037 U 0.0095 <0.0037 U<0.0037 U<0.0037 U NA <0.0037 U 0.018 <0.0037 U <0.1 U <0.37 U <10 U <50 U NA 3.2 27 <0.49 U <0.25 U 5.7 2.4 6.1 2.7 0.019 J <0.49 U 6.9 12 18 B225_50_032322 B225-50 03/23/2022 50-50 <0.0029 U<0.0029 U<0.0029 U 0.022 <0.0029 U<0.0029 U<0.0029 U NA <0.0029 U 0.041 <0.0029 U <0.1 U <0.29 U 18 <50 U NA 3.4 52 <0.49 U <0.25 U 7.8 6.7 7.7 4.4 0.022 J 0.48 J 11 15 20 B226_10_032222 B226-10 03/22/2022 10-10 <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U NA <0.004 U<0.004 U<0.004 U <0.1 U <0.4 U <10 U <50 U NA 1.5 J 510 <0.5 U <0.25 U 4.6 0.72 3.6 3 0.019 J <0.5 U 4.6 9.1 8 B226_15_032222 B226-15 03/22/2022 15-15 <0.0035 U<0.0035 U<0.0035 U<0.0035 U<0.0035 U<0.0035 U<0.0035 U NA <0.0035 U<0.0035 U<0.0035 U <0.099 U <0.35 U <9.9 U <50 U NA 1 J 320 <0.48 U <0.24 U 4.5 0.83 4.1 3.4 0.029 J < 0.48 U 4.5 8.3 12 B226_20_032222 B226-20 03/22/2022 20-20 <0.0061 U<0.0061 U<0.0061 U<0.0061 U<0.0061 U<0.0061 U<0.0061 U NA <0.0061 U<0.0061 U<0.0061 U <0.1 U <0.61 U <10 U <50 U NA 2.8 92 0.49 <0.23 U 15 4.4 8.8 6.1 0.043 J 1 22 22 37 B226_25_032222 B226-25 03/22/2022 25-25 <0.0044 U<0.0044 U<0.0044 U<0.0044 U<0.0044 U<0.0044 U<0.0044 U NA <0.0044 U0.0028 J<0.0044 U <0.1 U <0.44 U <10 U <50 U NA <1.9 U 120 <0.48 U <0.24 U 2.9 1.3 3.1 2.6 0.0095 J <0.48 U 3.7 6.6 9.7 B226_30_032222 B226-30 03/22/2022 30-30 <0.0035 U<0.0035 U<0.0035 U0.0018 J<0.0035 U<0.0035 U<0.0035 U NA <0.0035 U 0.011 <0.0035 U <0.1 U <0.35 U <10 U <50 U NA <1.9 U 470 <0.49 U <0.24 U 3.9 2.5 4.9 2.5 0.013 J <0.49 U 5.8 12 12 B226_35_032222 B226-35 03/22/2022 35-35 <0.0045 U<0.0045 U<0.0045 U0.0034 J<0.0045 U<0.0045 U<0.0045 U NA <0.0045 U 0.024 <0.0045 U <0.1 U <0.45 U <10 U <50 U NA <1.9 U 64 <0.49 U <0.24 U 3.9 3 3.7 2.3 0.016 J <0.49 U 4.4 7.5 9.5 B226_40_032222 B226-40 03/22/2022 40-40 <0.0043 U<0.0043 U<0.0043 U 0.0077 <0.0043 U<0.0043 U<0.0043 U NA <0.0043 U 0.064 <0.0043 U <0.1 U <0.43 U <10 U <50 U NA 3 220 <0.5 U 0.68 8.6 17 9.3 3.5 0.085 1.1 17 19 27 B226_45_032222 B226-45 03/22/2022 45-45 <0.0029 U<0.0029 U<0.0029 U 0.018 <0.0029 U<0.0029 U<0.0029 U NA <0.0029 U 0.13 E<0.0029 U <0.1 U 0.12 J <10 U <50 U NA 2.1 28 <0.48 U <0.24 U 6.5 1.5 5.8 2.6 0.026 J 0.47 J 8.4 12 22 B226_50_032222 B226-50 03/22/2022 50-50 <0.004 U <0.004 U <0.004 U 0.022 <0.004 U <0.004 U <0.004 U NA <0.004 U 0.1 <0.004 U <0.1 U <0.4 U <10 U <50 U NA 3.2 44 <0.46 U <0.23 U 9 3.4 7.8 3.7 0.021 J 0.34 J 10 16 23 B227_5_032322 B227-5 03/23/2022 5-5 <0.0029 U<0.0029 U<0.0029 U<0.0029 U<0.0029 U<0.0029 U<0.0029 U NA <0.0029 U<0.0029 U<0.0029 U <0.1 U <0.29 U <10 U <50 U NA 1 J 17 <0.48 U <0.24 U 3.4 0.91 2.7 1.5 <0.089 U 0.49 1.8 5.7 5.3 B227_10_032322 B227-10 03/23/2022 10-10 <0.0042 U<0.0042 U<0.0042 U<0.0042 U<0.0042 U<0.0042 U<0.0042 U NA <0.0042 U<0.0042 U<0.0042 U <0.1 U <0.42 U <10 U <50 U NA 2.3 38 <0.48 U <0.24 U 7.4 0.79 5.5 3.1 0.022 J <0.48 U 6 13 10 B227_15_032322 B227-15 03/23/2022 15-15 <0.0028 U<0.0028 U<0.0028 U<0.0028 U<0.0028 U<0.0028 U<0.0028 U NA <0.0028 U<0.0028 U<0.0028 U <0.1 U <0.28 U <10 U <50 U NA <1.9 U 48 <0.47 U <0.23 U 14 1.2 6 5.3 0.088 J <0.47 U 7.5 8.1 13 B227_20_032322 B227-20 03/23/2022 20-20 <0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U NA <0.0039 U<0.0039 U<0.0039 U <0.1 U <0.39 U <10 U <50 U NA <1.8 U 30 <0.46 U <0.23 U 6.8 1.4 5.4 3.5 0.029 J <0.46 U 5.8 9.2 13 B227_25_032322 B227-25 03/23/2022 25-25 <0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U<0.0039 U NA <0.0039 U0.0033 J<0.0039 U <0.1 U <0.39 U <10 U <50 U NA <1.9 U 21 <0.46 U <0.23 U 4.6 2.9 3.8 2.6 0.017 J <0.46 U 6.5 6.9 10 B227_30_032322 B227-30 03/23/2022 30-30 <0.0028 U<0.0028 U<0.0028 U<0.0028 U<0.0028 U<0.0028 U<0.0028 U NA <0.0028 U 0.012 <0.0028 U <0.1 U <0.28 U <10 U <50 U NA <1.8 U 24 <0.46 U <0.23 U 4.6 3.3 5.2 2.8 0.011 J <0.46 U 6.6 7.9 13 B227_35_032322 B227-35 03/23/2022 35-35 <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U <0.004 U NA <0.004 U0.0031 J<0.004 U <0.1 U <0.4 U <10 U <50 U NA <2 U 27 <0.49 U <0.24 U 5.9 7.9 4.6 3 <0.08 U <0.49 U 8.6 8.2 12 B227_40_032322 B227-40 03/23/2022 40-40 <0.0047 U<0.0047 U<0.0047 U0.0019 J<0.0047 U<0.0047 U<0.0047 U NA <0.0047 U 0.016 <0.0047 U NA <0.47 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B227_45_032322 B227-45 03/23/2022 45-45 <0.0031 U<0.0031 U<0.0031 U 0.006 <0.0031 U<0.0031 U<0.0031 U NA <0.0031 U 0.13 E<0.0031 U <0.1 U 0.13 J <10 U <50 U NA 4.6 100 <0.49 U 0.6 16 11 13 7.9 0.046 J 1.5 31 24 49 B227_50_032322 B227-50 03/23/2022 50-50 <0.0025 U<0.0025 U<0.0025 U 0.0052 <0.0025 U<0.0025 U<0.0025 U NA <0.0025 U 0.096 <0.0025 U <0.099 U <0.25 U <9.9 U <50 U NA 1.8 J 32 <0.47 U <0.23 U 7 2.1 6.8 2.9 0.046 J 0.29 J 14 12 20 B228_5_032222 B228-5 03/22/2022 5-5 <0.005 U <0.005 U <0.005 U <0.005 U <0.005 U <0.005 U <0.005 U NA <0.005 U<0.005 U<0.005 U <0.1 U <0.5 U <10 U <50 U NA 1.1 J 13 <0.49 U <0.25 U 2.3 0.66 1.9 1.4 <0.085 U 3.7 1.3 5 4.5 B228_10_032222 B228-10 03/22/2022 10-10 <0.0049 U<0.0049 U<0.0049 U<0.0049 U<0.0049 U<0.0049 U<0.0049 U NA <0.0049 U<0.0049 U<0.0049 U <0.099 U <0.49 U <9.9 U <50 U NA 1.7 J 38 <0.47 U <0.23 U 3.8 1.5 3.4 3 0.042 J 11 5 8.3 8.1 B228_15_032222 B228-15 03/22/2022 15-15 <0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U<0.0037 U NA <0.0037 U<0.0037 U<0.0037 U <0.1 U <0.37 U <10 U <50 U NA <2 U 28 <0.5 U <0.25 U 3.4 1 3.6 2.8 0.017 J 1.2 3.7 9.4 9 B228_20_032222 B228-20 03/22/2022 20-20 <0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U<0.0033 U NA <0.0033 U<0.0033 U<0.0033 U <0.1 U <0.33 U <10 U <50 U NA 1.2 J 23 <0.46 U <0.23 U 3.4 1.8 4.3 2.7 0.013 J <0.46 U 3.9 8.9 9.1 B228_25_032222 B228-25 03/22/2022 25-25 <0.003 U <0.003 U <0.003 U <0.003 U <0.003 U <0.003 U <0.003 U NA <0.003 U<0.003 U<0.003 U <0.099 U 0.12 J <9.9 U <50 U NA 1.2 J 24 <0.48 U <0.24 U 4.2 1.4 5.5 3.2 <0.091 U 0.34 J 4.6 8.6 11 B228_30_032222 B228-30 03/22/2022 30-30 <0.0046 U<0.0046 U<0.0046 U<0.0046 U<0.0046 U<0.0046 U<0.0046 U NA <0.0046 U 0.008 <0.0046 U <0.099 U <0.46 U <9.9 U <50 U NA <2 U 19 <0.49 U <0.24 U 2.8 1.2 3.4 2.5 <0.08 U <0.49 U 3.2 5.3 9.1 B228_35_032222 B228-35 03/22/2022 35-35 <0.0036 U<0.0036 U<0.0036 U0.0021 J<0.0036 U<0.0036 U<0.0036 U NA <0.0036 U 0.022 <0.0036 U <0.1 U <0.36 U <10 U <50 U NA <2 U 15 <0.49 U <0.24 U 3 1.9 2.3 1.6 <0.086 U <0.49 U 3.4 4 7.9 B228_40_032222 B228-40 03/22/2022 40-40 <0.0028 U<0.0028 U<0.0028 U 0.0033 <0.0028 U<0.0028 U<0.0028 U NA <0.0028 U 0.043 <0.0028 U <0.099 U <0.28 U <9.9 U <50 U NA 9.5 43 <0.5 U <0.25 U 11 2.4 7.7 3.4 0.029 J 0.65 13 24 26 B228_45_032222 B228-45 03/22/2022 45-45 <0.0016 U<0.0016 U<0.0016 U 0.0036 <0.0016 U<0.0016 U<0.0016 U NA <0.0016 U 0.4 <0.0016 U <0.1 U 0.13 J <10 U <50 U NA 6.9 69 <0.47 U <0.23 U 13 5 15 5.9 0.13 9.1 19 29 50 B228_50_032222 B228-50 03/22/2022 50-50 <0.0028 U<0.0028 U<0.0028 U0.0024 J<0.0028 U<0.0028 U<0.0028 U NA <0.0028 U 0.055 <0.0028 U <0.099 U <0.28 U <9.9 U <50 U NA 3.9 74 <0.47 U 1.3 7.8 6.3 8.4 6 0.03 J 0.74 18 20 23 2022 Soil Investigation
B226
B227
B228
B225

Page 4 of 5 ends

Attachment B
Table C2
Historical Soil Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
Notes:

Historical data from the following reports:

Site Assessment Report, Vadose Zone Soil Sampling, Former SEMCO Twist Drill & Tool Company, 2936 Industrial Parkway, Santa Maria, California dated 25 May 2022 by Analytical Consulting Group, Inc.

Results of Soil Sampling Beneath the Concrete Pond Structure Located at the SEMCO Facility, Santa Maria, California dated 3 December 1991 by ERC Environmental and Energy Services Co. Inc.

Supplementary Subsurface Investigation, SEMCO Twist Drill and Tool Company Facility, Santa Maria, California dated March 1990 by ERC Environmental and Energy Services Co.

Subsurface Investigation Letter Report, SEMCO Twist Drill and Tool Company, Santa Maria, California dated 1 April 1988 by WESTEC Services, Inc.

CAS - Chemical Abstract Service
ESL - Environmental Screening Level
mg/kg - Milligrams per kilogram
NA - Not Analyzed or Not Available (Historical Data)
NS - No standard
Only detected results were reported for metals data
RL - Reporting Limit
<RL - Not detected
RWQCB - Regional Water Quality Control Board
Soil results were compared to San Francisco Bay RWQCB Leaching to Groundwater ESL, Lower of Drinking and Non-drinking Water Values, Soil Direct Exposure Human Health Risk Levels - Commercial/Industrial and Construction Worker: Any Land Use, Lower of Cancer Risk and Noncancer Hazard Values, and (January 2019) Qualifiers:

J - The analyte was detected above the method detection limit (MDL), but below the RL; therefore, the result is an estimated concentration.

U - The analyte was analyzed for, but was not detected at a level greater than or equal to the RL; the value shown in the table is the RL.

Exceedance Summary:
- Result exceeds Leaching to Groundwater ESL
- Result exceeds Soil Direct Exposure Commercial/Industrial ESL - Result exceeds Soil Direct Exposure Construction Worker: Any Land Use ESL 10 10
10

Page 5 of 5 ends

Attachment B
Table C3
Historical Soil Gas Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
1,1,1-Trichloroethane
1,1,2-Trichloro-1,2,2-
Trifluoroethane
1,1-Dichloroethane
1,1-Dichloroethene
1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
(Mesitylene)
1-Chlorohexane
2,2,4-Trimethylpentane
2-Hexanone (MBK)
2-Methyl Propane
4-Ethyltoluene
Acetone
Allyl Chloride (3-
Chloropropene)
Benzene
Carbon Disulfide
Chloroethane
Chloroform
Chloromethane
Cis-1,2-Dichloroethene
Cyclohexane
Cymene
71-55-6 76-13-1 75-34-3 75-35-4 95-63-6 108-67-8 544-10-5 540-84-1 591-78-6 75-28-5 622-96-8 67-64-1 107-05-1 71-43-2 75-15-0 75-00-3 67-66-3 74-87-3 156-59-2 110-82-7 99-87-6 150,000 NS 260 10,000 NS NS NS NS NS NS NS 4,500,000 NS 14 NS 1,500,000 18 13,000 1,200 NS NS Sample Name Original
Sample Name Sample Date µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 SG-1 SG-1-5_091389 SG1-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-2 SG-2-5_091389 SG2-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-3 SG-3-5_091389 SG3-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-4 SG-4-5_091389 SG4-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-5 SG-5-5_091389 SG5-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-6-5_013989 SG6-5 09/13/1989 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-6-5_091389 SG6-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-7 SG-7-5_091389 SG7-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-8 SG-8-5_091389 SG8-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-9 SG-9-5_091389 SG9-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-10 SG-10-5_091389 SG10-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-11 SG-11-5_091389 SG11-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-12 SG-12-5_091389 SG12-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-13-5_091389 SG13-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-13-5_130989 SG13-5 09/13/1989 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-14 SG-14-5_091389 SG14-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-15 SG-15-5_091389 SG15-5 09/13/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-16 SG-16-5_091489 SG16-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-17 SG-17-5_091489 SG17-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-18 SG-18-5_091489 SG18-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-19 SG-19-5_091489 SG19-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-20 SG-20-5_091489 SG20-11 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-21 SG-21-5_091489 SG21-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-22 SG-22-5_091489 SG22-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-23 SG-23-5_091489 SG23-4 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-24 SG-24-5_091489 SG24-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-25 SG-25-5_091489 SG25-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-26 SG-26-5_091489 SG26-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-27 SG-27-5_091489 SG27-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-28 SG-28-5_091489 SG28-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-29 SG-29-4_091489 SG29-4 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-30 SG-30-8_091489 SG30-8 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-31 SG-31-5_091489 SG31-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-32 SG-32-5_091489 SG32-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-33 SG-33-5_091489 SG33-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SG-34 SG-34-5_091489 SG34-5 09/14/1989 NA NA NA ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SV-1 SV-1-5_040721 SV1-5 04/07/2021 ND U NA NA NA NA NA NA NA NA 6.8 NA 19 NA NA NA NA NA NA ND U NA NA SV-2 SV-2-5_040721 SV2-5 04/07/2021 ND U NA NA NA NA NA NA NA NA NA NA 14 NA NA NA NA NA NA ND U NA NA SV-3 SV-3-5_040521 SV3-5 04/05/2021 ND U NA NA NA 25 NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA NA SV-4 SV-4-5_040521 SV4-5 04/05/2021 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA NA SV-5 SV-5-5_040521 SV5-5 04/05/2021 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA NA SV-6 SV-6-5_040521 SV6-5 04/05/2021 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA NA SV-7 SV-7-5_040521 SV7-5 04/05/2021 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA NA SV-8 SV-8-5_040521 SV8-5 04/05/2021 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 45 NA 160 NA NA SV-9 SV-9-5_040521 SV9-5 04/05/2021 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA NA SV-10 SV-10-5_040621 SV10-5 04/06/2021 3.7 NA 13 NA 19 8.9 NA NA 19 21 15 110 E NA 4.2 47 4.5 ND U NA 52 NA 4.8 SV-11 SV-11-5_040621 SV11-5 04/06/2021 ND U NA ND U NA ND U ND U NA NA ND U ND U ND U ND U NA ND U ND U ND U ND U NA ND U NA ND U SV-12 SV-12-5_040621 SV12-5 04/06/2021 3.2 NA ND U 3.6 6.0 3.3 NA NA ND U 7.3 2.6 51 NA 12 6.9 ND U 6.5 NA 160 E NA ND U SV-13 SV-13-5_040621 SV13-5 04/06/2021 ND U NA NA NA NA NA NA 3.2 NA 48 NA 220 NA 18 52 NA NA NA 140 NA NA SV-14 SV-14-5_040621 SV14-5 04/06/2021 ND U NA NA NA 32 13 NA 8.5 NA 12 6.9 45 NA 11 NA NA NA NA ND U NA 3.6 Analyte
Location
CAS Number
Subslab/Soil Gas VI Commercial/Industrial ESL
Volatile Organic Compounds
SG-6
SG-13
Soil Vapor

Page 1 of 5 ends

Attachment B
Table C3
Historical Soil Gas Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
Sample Name Original
Sample Name Sample Date
SG-1 SG-1-5_091389 SG1-5 09/13/1989
SG-2 SG-2-5_091389 SG2-5 09/13/1989
SG-3 SG-3-5_091389 SG3-5 09/13/1989
SG-4 SG-4-5_091389 SG4-5 09/13/1989
SG-5 SG-5-5_091389 SG5-5 09/13/1989
SG-6-5_013989 SG6-5 09/13/1989
SG-6-5_091389 SG6-5 09/13/1989
SG-7 SG-7-5_091389 SG7-5 09/13/1989
SG-8 SG-8-5_091389 SG8-5 09/13/1989
SG-9 SG-9-5_091389 SG9-5 09/13/1989
SG-10 SG-10-5_091389 SG10-5 09/13/1989
SG-11 SG-11-5_091389 SG11-5 09/13/1989
SG-12 SG-12-5_091389 SG12-5 09/13/1989
SG-13-5_091389 SG13-5 09/13/1989
SG-13-5_130989 SG13-5 09/13/1989
SG-14 SG-14-5_091389 SG14-5 09/13/1989
SG-15 SG-15-5_091389 SG15-5 09/13/1989
SG-16 SG-16-5_091489 SG16-5 09/14/1989
SG-17 SG-17-5_091489 SG17-5 09/14/1989
SG-18 SG-18-5_091489 SG18-5 09/14/1989
SG-19 SG-19-5_091489 SG19-5 09/14/1989
SG-20 SG-20-5_091489 SG20-11 09/14/1989
SG-21 SG-21-5_091489 SG21-5 09/14/1989
SG-22 SG-22-5_091489 SG22-5 09/14/1989
SG-23 SG-23-5_091489 SG23-4 09/14/1989
SG-24 SG-24-5_091489 SG24-5 09/14/1989
SG-25 SG-25-5_091489 SG25-5 09/14/1989
SG-26 SG-26-5_091489 SG26-5 09/14/1989
SG-27 SG-27-5_091489 SG27-5 09/14/1989
SG-28 SG-28-5_091489 SG28-5 09/14/1989
SG-29 SG-29-4_091489 SG29-4 09/14/1989
SG-30 SG-30-8_091489 SG30-8 09/14/1989
SG-31 SG-31-5_091489 SG31-5 09/14/1989
SG-32 SG-32-5_091489 SG32-5 09/14/1989
SG-33 SG-33-5_091489 SG33-5 09/14/1989
SG-34 SG-34-5_091489 SG34-5 09/14/1989
SV-1 SV-1-5_040721 SV1-5 04/07/2021
SV-2 SV-2-5_040721 SV2-5 04/07/2021
SV-3 SV-3-5_040521 SV3-5 04/05/2021
SV-4 SV-4-5_040521 SV4-5 04/05/2021
SV-5 SV-5-5_040521 SV5-5 04/05/2021
SV-6 SV-6-5_040521 SV6-5 04/05/2021
SV-7 SV-7-5_040521 SV7-5 04/05/2021
SV-8 SV-8-5_040521 SV8-5 04/05/2021
SV-9 SV-9-5_040521 SV9-5 04/05/2021
SV-10 SV-10-5_040621 SV10-5 04/06/2021
SV-11 SV-11-5_040621 SV11-5 04/06/2021
SV-12 SV-12-5_040621 SV12-5 04/06/2021
SV-13 SV-13-5_040621 SV13-5 04/06/2021
SV-14 SV-14-5_040621 SV14-5 04/06/2021
Analyte
Location
CAS Number
Subslab/Soil Gas VI Commercial/Industrial ESL
SG-6
SG-13
Soil Vapor
Ethyl Acetate
Ethylbenzene
Isopropanol
Isopropylbenzene
(Cumene)
M,P-Xylene
Methyl Ethyl Ketone (2-
Butanone)
Methyl Isobutyl Ketone (4-
Methyl-2-Pentanone)
Methylene Chloride
n-Heptane
n-Hexane
n-Propylbenzene
o-Xylene (1,2-
Dimethylbenzene)
Propylene
Sec-Butylbenzene
Styrene
Tetrachloroethene (PCE)
Tetrahydrofuran
Toluene
Trans-1,2-Dichloroethene
Trichloroethane
Trichloroethene (TCE)
Vinyl Chloride
141-78-6 100-41-4 67-63-0 98-82-8 179601-23-1 78-93-3 108-10-1 75-09-2 142-82-5 110-54-3 103-65-1 95-47-6 115-07-1 135-98-8 100-42-5 127-18-4 109-99-9 108-88-3 156-60-5 25323-89-1 79-01-6 75-01-4 NS 160 NS NS NS 730,000 440,000 410 NS NS NS NS NS NS 130,000 67 NS 44,000 12,000 NS 100 5.2 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.1 0.2 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.4 650 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.2 550 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.2 470 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.4 730 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.6 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 560 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.1 160 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.08 0.6 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.09 17 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.2 6 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.9 5,300 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.08 24 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 74 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.04 0.06 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.05 0.009 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.2 1 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.08 0.003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.02 0.02 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.2 2 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.06 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.2 0.8 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.1 0.003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.008 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 8 400 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.2 8 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.05 34 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.02 0.0008 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 780 2,200 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 150 2 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 170 55 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1 28 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 820 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.3 180 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.06 0.003 NA NA NA 20 4.5 8.3 17 NA NA NA NA NA 4.2 NA NA NA ND U NA ND U ND U NA 22 ND U NA 2.6 NA 5.9 13 17 NA NA NA NA NA 4.0 NA NA NA ND U NA 4.4 ND U NA 1,900 ND U

NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA ND U ND U NA ND U ND U

NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA ND U ND U NA ND U ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA ND U ND U NA 180 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA ND U ND U NA 15,000 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA ND U NA ND U ND U NA 430 ND U NA 11 55 6.3 53 39 10 NA 12 17 7.2 21 100 E 3.2 NA 21 NA 3.1 ND U NA 26 3.9 NA ND U ND U ND U ND U ND U ND U NA ND U ND U ND U ND U ND U ND U NA ND U NA ND U ND U NA 450,000 ND U NA 15 120 E ND U 59 ND U ND U NA 11 3.3 3.0 17 21 ND U NA 17 NA 39 87 NA 12,000 ND U NA 32 11 5.3 120 54 NA NA 31 35 NA 41 400 E NA NA ND U NA 47 400 NA 36 5.7 NA 23 25 3.2 90 NA NA NA 17 12 7.7 31 NA NA NA ND U 2.6 46 ND U NA 18 ND U Volatile Organic Compounds

Page 2 of 5 ends

Attachment B
Table C3
Historical Soil Gas Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
1,1,1-Trichloroethane
1,1,2-Trichloro-1,2,2-
Trifluoroethane
1,1-Dichloroethane
1,1-Dichloroethene
1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
(Mesitylene)
1-Chlorohexane
2,2,4-Trimethylpentane
2-Hexanone (MBK)
2-Methyl Propane
4-Ethyltoluene
Acetone
Allyl Chloride (3-
Chloropropene)
Benzene
Carbon Disulfide
Chloroethane
Chloroform
Chloromethane
Cis-1,2-Dichloroethene
Cyclohexane
Cymene
71-55-6 76-13-1 75-34-3 75-35-4 95-63-6 108-67-8 544-10-5 540-84-1 591-78-6 75-28-5 622-96-8 67-64-1 107-05-1 71-43-2 75-15-0 75-00-3 67-66-3 74-87-3 156-59-2 110-82-7 99-87-6 150,000 NS 260 10,000 NS NS NS NS NS NS NS 4,500,000 NS 14 NS 1,500,000 18 13,000 1,200 NS NS Sample Name Original
Sample Name Sample Date µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 Analyte
Location
CAS Number
Subslab/Soil Gas VI Commercial/Industrial ESL
Volatile Organic Compounds
SV-15 SV-15-5_040621 SV15-5 04/06/2021 ND U NA NA 18,000 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 4,000,000 NA NA SV-16 SV-16-5_040621 SV16-5 04/06/2021 ND U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 2,600 NA NA SV-17 SV-17-5_040621 SV17-5 04/06/2021 3.8 NA NA NA 9.4 5.7 NA NA NA 4 2.7 15 NA 6.7 NA NA 12 NA 73 NA NA SV-18 SV-18-5_040621 SV18-5 04/06/2021 ND U 8.6 NA NA 3.7 NA NA NA NA 4.4 NA 16 NA NA 11 NA 2.7 NA ND U NA NA SV-19-5_040621 SV19-5 04/06/2021 ND U NA NA NA 29 23 NA NA NA 3.7 11 37 NA 10 5.7 ND U 9.9 NA ND U NA 6.2 SV-19-5_040621_DUP SV19-5_DUP 04/06/2021 NA NA NA NA 22 16 NA NA NA NA 9.1 24 NA 6.9 3.8 NA 6.5 NA NA NA 4.7 SV-20 SV-20-5_040621 SV20-5 04/06/2021 ND U NA NA NA 14 9.1 3.1 10 NA 15 4.2 29 NA 15 15 NA NA 2.5 4.2 3.1 NA SV-21 SV-21-5_040621 SV21-5 04/06/2021 ND U NA NA NA NA NA NA NA NA 3.1 NA 14 NA 4.4 NA NA NA NA ND U NA NA SV-22 SV-22-5_040721 SV22-5 04/07/2021 ND U NA NA NA 3.6 NA NA NA NA 2.6 NA 19 NA NA NA NA 2.5 NA 2.6 NA NA SV-23 SV-23-5_040721 SV23-5 04/07/2021 ND U NA NA NA 71 47 NA NA NA 5.1 38 62 E NA 5.8 7.9 NA NA NA 19 NA 9.9 SV-24 SV-24-5_040721 SV24-5 04/07/2021 ND U NA NA NA 2.9 NA NA NA NA 35 NA 300 E NA 8.9 5.8 NA NA NA ND U 5.3 NA SV-25 SV-25-5_040721 SV25-5 04/07/2021 ND U 17 NA NA 2.7 NA NA NA NA 16 NA 72 E NA 13 4.6 NA ND U NA ND U 5.9 NA SV-26 SV-26-5_040721 SV26-5 04/07/2021 ND U NA NA NA 15 5.7 NA 14 NA 33 7.5 86 NA 16 6.1 NA 4.4 NA ND U 3.2 NA SV-27 SV-27-5_040721 SV27-5 04/07/2021 ND U NA NA NA 17 7.2 NA 16 NA 26 6.1 67 NA 9.3 8.2 NA NA NA ND U 3.7 NA SV-28 SV-28-5_040721 SV28-5 04/07/2021 ND U 7.2 NA NA 110 38 NA 14 14 95 33 130 6.1 19 12 NA NA NA ND U 13 8.1 SV-29 SV-29-5_040621 SV29-5 04/06/2021 ND U NA NA NA 8.8 6.7 NA 30 NA 58 4.0 200 NA 38 39 NA NA NA 7.1 NA NA SV-30 SV-30-5_040721 SV30-5 04/07/2021 ND U NA NA NA 6.9 4.1 NA 16 ND U 61 ND U 97 ND U 18 10 NA NA NA ND U ND U ND U SV-31 SV-31-5_040721 SV31-5 04/07/2021 ND U NA NA NA 27 7.7 NA 7.0 NA 7.8 5.7 55 NA 4.6 NA NA NA NA ND U 3.3 NA SV-32 SV-32-5_040721 SV32-5 04/07/2021 ND U 11 NA NA 8.3 5.5 NA NA NA 3.5 2.5 13 NA NA NA NA 4.6 NA ND U NA NA SV-33 SV-33-5_040721 SV33-5 04/07/2021 ND U 15 NA NA 3.0 NA NA NA NA 4.4 NA 25 NA 2.6 NA NA 11 NA ND U NA NA SV-34 SV-34-5_040721 SV34-5 04/07/2021 ND U NA NA NA NA NA NA NA NA 2.5 NA 24 NA NA NA NA NA NA ND U NA NA SV-35 SV-35-5_040721 SV35-5 04/07/2021 ND U NA NA NA 3.5 NA NA NA NA 4.0 NA 22 NA NA NA NA 27 NA ND U NA NA SV-36 SV-36-5_040721 SV36-5 04/07/2021 ND U NA NA NA NA NA NA NA NA NA NA 17 NA NA NA NA NA NA ND U NA NA SV-37 SV-37-5_040721 SV37-5 04/07/2021 ND U NA NA NA 3.2 NA NA 4.0 NA 37 NA 110 E NA 21 14 NA NA NA ND U NA NA SV-38 SV-38-5_040721 SV38-5 04/07/2021 ND U NA NA NA NA NA NA NA NA 3.0 NA 26 NA NA NA NA NA NA ND U NA NA SV-39 SV-39-5_040721 SV39-5 04/07/2021 ND U NA NA NA 3.8 NA NA NA NA NA NA 87 NA 15 6.8 NA NA NA ND U NA 310 SV-40-5_040721 SV40-5 04/07/2021 ND U NA NA NA NA NA NA NA NA 14 NA 69 E NA 13 10 NA NA NA ND U 6.1 NA SV-40-5_040721_DUP SV40-5_DUP 04/07/2021 ND U NA NA NA NA NA NA NA NA 3 NA 76 E NA 14 10 NA NA NA ND U 6.6 NA SS-1 SS-1_040621 SS1 04/06/2021 3.1 NA NA NA NA NA NA NA NA 6.8 NA 300 E NA NA NA NA NA NA ND U NA NA SS-2 SS-2_040621 SS2 04/06/2021 ND U NA NA NA NA NA NA NA NA NA NA 320 E 8.5 NA NA NA 10 NA 10 NA NA SS-3 SS-3_040621 SS3 04/06/2021 ND U NA NA NA 2.7 NA NA 5.4 NA NA NA 280 NA NA NA NA NA NA ND U NA NA SS-4 SS-4_040621 SS4 04/06/2021 15 NA ND U NA ND U ND U NA NA 19 26 ND U 380 NA 3.4 10 4.5 24 NA 21 NA ND U Subslab
Soil Gas
SV-19
SV-40
Soil Vapor

Page 3 of 5 ends

Attachment B
Table C3
Historical Soil Gas Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
Sample Name Original
Sample Name Sample Date
Analyte
Location
CAS Number
Subslab/Soil Gas VI Commercial/Industrial ESL
SV-15 SV-15-5_040621 SV15-5 04/06/2021
SV-16 SV-16-5_040621 SV16-5 04/06/2021
SV-17 SV-17-5_040621 SV17-5 04/06/2021
SV-18 SV-18-5_040621 SV18-5 04/06/2021
SV-19-5_040621 SV19-5 04/06/2021
SV-19-5_040621_DUP SV19-5_DUP 04/06/2021
SV-20 SV-20-5_040621 SV20-5 04/06/2021
SV-21 SV-21-5_040621 SV21-5 04/06/2021
SV-22 SV-22-5_040721 SV22-5 04/07/2021
SV-23 SV-23-5_040721 SV23-5 04/07/2021
SV-24 SV-24-5_040721 SV24-5 04/07/2021
SV-25 SV-25-5_040721 SV25-5 04/07/2021
SV-26 SV-26-5_040721 SV26-5 04/07/2021
SV-27 SV-27-5_040721 SV27-5 04/07/2021
SV-28 SV-28-5_040721 SV28-5 04/07/2021
SV-29 SV-29-5_040621 SV29-5 04/06/2021
SV-30 SV-30-5_040721 SV30-5 04/07/2021
SV-31 SV-31-5_040721 SV31-5 04/07/2021
SV-32 SV-32-5_040721 SV32-5 04/07/2021
SV-33 SV-33-5_040721 SV33-5 04/07/2021
SV-34 SV-34-5_040721 SV34-5 04/07/2021
SV-35 SV-35-5_040721 SV35-5 04/07/2021
SV-36 SV-36-5_040721 SV36-5 04/07/2021
SV-37 SV-37-5_040721 SV37-5 04/07/2021
SV-38 SV-38-5_040721 SV38-5 04/07/2021
SV-39 SV-39-5_040721 SV39-5 04/07/2021
SV-40-5_040721 SV40-5 04/07/2021
SV-40-5_040721_DUP SV40-5_DUP 04/07/2021
SS-1 SS-1_040621 SS1 04/06/2021
SS-2 SS-2_040621 SS2 04/06/2021
SS-3 SS-3_040621 SS3 04/06/2021
SS-4 SS-4_040621 SS4 04/06/2021
Subslab
Soil Gas
SV-19
SV-40
Soil Vapor
Ethyl Acetate
Ethylbenzene
Isopropanol
Isopropylbenzene
(Cumene)
M,P-Xylene
Methyl Ethyl Ketone (2-
Butanone)
Methyl Isobutyl Ketone (4-
Methyl-2-Pentanone)
Methylene Chloride
n-Heptane
n-Hexane
n-Propylbenzene
o-Xylene (1,2-
Dimethylbenzene)
Propylene
Sec-Butylbenzene
Styrene
Tetrachloroethene (PCE)
Tetrahydrofuran
Toluene
Trans-1,2-Dichloroethene
Trichloroethane
Trichloroethene (TCE)
Vinyl Chloride
141-78-6 100-41-4 67-63-0 98-82-8 179601-23-1 78-93-3 108-10-1 75-09-2 142-82-5 110-54-3 103-65-1 95-47-6 115-07-1 135-98-8 100-42-5 127-18-4 109-99-9 108-88-3 156-60-5 25323-89-1 79-01-6 75-01-4 NS 160 NS NS NS 730,000 440,000 410 NS NS NS NS NS NS 130,000 67 NS 44,000 12,000 NS 100 5.2 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 Volatile Organic Compounds
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 13,000 NA ND U 5,600 NA 11,000,000 ND U NA NA NA NA NA NA NA NA NA NA NA NA 220 NA NA ND U NA ND U ND U NA 120,000 ND U NA 110 NA 11 310 E 19 NA NA 4.0 NA 2.9 100 3.8 NA NA 62 NA 15 62 NA 16,000 ND U NA NA NA 7.3 14 21 NA NA NA NA NA 4.7 7.4 NA NA 22 NA 6.9 ND U NA 24 ND U NA 40 NA 13 150 23 NA NA 4.0 NA 14 48 8.7 NA NA 5.0 NA 76 ND U NA 110 ND U NA 29 NA 9.0 110 14 NA NA NA NA 10 35 NA NA NA NA NA 56 NA NA 83 NA

3.9 21 20 18 82 36 NA NA 25 13 5.6 23 19 NA NA 15 NA 60 ND U NA 180 ND U NA 3.4 12 6.3 12 17 NA NA NA NA NA 2.9 NA NA NA 3.8 NA 14 ND U NA 61 ND U NA 12 13 6.5 49 19 NA NA NA NA 2.7 15 NA NA NA ND U NA 15 ND U NA 1,300 ND U NA 100 80 E 17 530 34 NA NA NA NA 50 120 E 5.9 NA 3.9 6.8 4.5 87 5.2 NA 1,400 ND U NA 6.8 2,400 E NA 27 18 25 NA 9.3 17 NA 6.4 200 E NA NA ND U 3.5 19 ND U NA ND U ND U NA 3.0 59 3.2 7.3 39 20 NA 13 23 NA 2.6 8.7 NA NA ND U NA 15 ND U NA 140 ND U NA 28 18 4.3 110 45 18 2.6 35 24 9.0 32 210 NA NA ND U NA 72 ND U NA 190 ND U NA 20 15 4.5 77 29 64 NA 20 28 7.5 24 190 E NA NA ND U 6.8 49 ND U NA 170 ND U NA 8.7 27 8.6 26 66 63 NA 33 47 27 11 450 NA NA ND U NA 49 ND U NA 120 ND U NA 31 16 6.9 110 55 NA 3.9 59 87 5.3 36 620 NA NA ND U 17 85 ND U NA 34 ND U NA 12 36 4.2 45 25 47 2.9 26 50 3.1 13 340 E NA NA ND U 11 46 ND U NA ND U ND U NA 8.7 880 E NA 36 NA 14 NA 9.8 4.4 4.9 11 14 NA NA 26 NA 28 ND U NA 22 ND U NA 6.0 NA 2.7 28 NA NA NA NA NA 2.7 8.2 NA NA NA 71 NA 9.1 ND U NA 1,700 ND U NA NA 41 NA NA 12 14 NA NA NA NA NA 18 NA NA 47 NA 4.3 NA NA 3,000 NA NA NA 120 E NA 7.1 NA NA NA NA NA NA NA NA NA NA 14 NA 3.1 ND U NA 38 ND U NA NA 83 E NA NA NA 15 NA NA NA NA NA 11 NA NA 23 NA 4.1 ND U NA 1,600 ND U NA NA 93 E NA NA NA 19 NA NA NA NA NA 5.5 NA NA ND U NA ND U ND U NA ND U ND U NA 5.7 37 NA 18 27 18 NA 18 33 NA 7.8 NA NA NA ND U 5.2 19 ND U NA ND U ND U NA NA 24 NA NA NA NA NA NA NA NA NA 8.9 NA NA ND U NA ND U ND U NA ND U ND U NA 3.8 NA NA 9.4 12 NA NA 17 20 NA 6.0 NA NA NA ND U NA 28 ND U NA ND U ND U NA 5.2 27 NA 18 18 NA 3.1 7.3 15 NA 8.4 95 E NA NA ND U NA 12 ND U NA ND U ND U NA 5.4 28 NA 19 19 10 NA 7.6 16 NA 8.7 100 E NA NA ND U NA 12 ND U NA ND U ND U NA NA 98 E NA NA 31 22 NA NA NA NA NA NA NA NA 3.7 2.5 5.2 ND U NA 11 ND U

5.9 NA 32 4.7 NA 31 28 NA NA NA NA NA NA NA NA 4.1 2.9 2.8 ND U NA 2,200 ND U NA NA NA 6.0 NA NA NA NA NA NA NA NA NA NA NA ND U NA 6.1 ND U NA 47 ND U NA ND U 300 5.1 ND U 54 47 NA ND U ND U ND U ND U ND U ND U NA 42 NA ND U ND U NA 3,100 ND U

Page 4 of 5 ends

Attachment B
Table C3
Historical Soil Gas Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
Notes:

Historical data from the following reports:

Soil Vapor Sampling Report, Former SEMCO Twist Drill & Tool Company, 2936 Industrial Parkway, Santra Maria, California, Site I.D. No. SLT3S2411351 dated 16 July 2021 by Analytical Consulting Group, Inc.

Subsurface Investigation: Phase 2, SEMCO Twist Drill and Tool Company Facility, Santa Maria, California dated December 1989 by ERC Environmental and Energy Services Co.

CAS - Chemical Abstract Service
ESL - Environmental Screening Level
NA - Not Analyzed or Not Available (Historical Data)
ND - Not detected
NS - No standard
RWQCB - Regional Water Quality Control Board
Soil gas results were compared to the San Francisco Bay RWQCB Subslab/Soil Gas Vapor Intrusion Human Health Risk Levels - Commercial/Industrial ESL, Lower of Cancer Risk and Noncancer Hazard Values (July 2019).µg/m3 - Micrograms per cubic meter Qualifiers:

E - Concentration of analyte exceeds the range of the calibration curve and/or linear range of the instrument.

U - The analyte was analyzed for, but was not detected at a level greater than or equal to the RL; the value shown in the table is the RL.

Exceedance Summary:
- Result exceeds Subslab/Soil Gas VI Commercial/Industrial ESL10

Page 5 of 5 ends

Attachment B
Table C4
Historical Indoor Air Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
1,1,1-Trichloroethane
1,1,2-Trichloroethane
1,2-Dichloroethane
Carbon Tetrachloride
Chloroform
Cis-1,2-Dichloroethene
Tetrachloroethene (PCE)
Trans-1,2-Dichloroethene
Trichloroethene (TCE)
Vinyl Chloride
71-55-6 79-00-5 107-06-2 56-23-5 67-66-3 156-59-2 127-18-4 156-60-5 79-01-6 75-01-4 4,400 0.77 0.47 2 0.53 35 2 350 3 0.16
Sample
Name
Original
Sample Name
Sample
Date µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 µg/m3 IA-1_032621 326-IA-1 03/26/2021 <0.1 U <0.1 U 0.1 0.32 0.1 <0.1 U <0.1 U <0.1 U 0.34 <0.009 U IA-1_012022 120-IA-1 01/21/2022 <0.1 U <0.1 U <0.1 U 0.34 0.22 <0.1 U 0.16 <0.1 U 1.1 <0.009 U IA-2_032621 326-IA-2 03/26/2021 <0.1 U <0.1 U 0.15 0.62 <0.1 U <0.1 U <0.1 U <0.1 U 0.12 <0.009 U IA-2_012022 120-IA-2 01/21/2022 <0.1 U <0.1 U 0.33 0.46 0.16 <0.1 U 0.52 <0.1 U 0.49 <0.009 U IA-3_032621 326-IA-3 03/26/2021 <0.1 U <0.1 U 0.13 0.33 0.13 <0.1 U <0.1 U <0.1 U 0.39 <0.009 U IA-3_012022 120-IA-3 01/21/2022 <0.1 U 0.17 0.15 0.31 0.18 <0.1 U 0.15 <0.1 U 1.1 <0.009 U OA-4_032621 326-OA-4 03/26/2021 <0.1 U <0.1 U 0.13 0.5 0.17 <0.1 U <0.1 U <0.1 U <0.1 U <0.009 U OA-4_012022 120-OA-4 01/21/2022 <0.1 U <0.1 U <0.1 U 0.3 0.13 <0.1 U 0.13 <0.1 U 0.31 <0.009 U OA-5_032621 326-OA-5 03/26/2021 0.14 <0.1 U <0.1 U 0.68 0.11 <0.1 U <0.1 U <0.1 U 0.16 <0.009 U OA-5_012022 120-OA-5 01/21/2022 <0.1 U <0.1 U <0.1 U 0.3 0.13 0.13 0.12 <0.1 U 4.1 <0.009 U OA-6_032621 326-OA-6 03/26/2021 <0.1 U <0.1 U <0.1 U 0.31 0.12 <0.1 U <0.1 U <0.1 U <0.1 U <0.009 U OA-6_012022 120-OA-6 01/21/2022 <0.1 U <0.1 U <0.1 U 0.3 0.11 <0.1 U 0.25 <0.1 U 0.54 <0.009 U Notes:

Historical data from the following reports:

CAS - Chemical Abstract Service
ESL - Environmental Screening Level
NA - not analyzed
RL - Reporting Limit
<RL - Not detected
RWQCB - Regional Water Quality Control Board
VI - vapor intrusion
µg/m3 - micrograms per cubic meter
Qualifiers:

Exceedance Summary:
- Result exceeds Indoor Air VI Commercial/Industrial ESL Outdoor Samples
U - The analyte was analyzed for, but was not detected at a level greater than or equal to the RL; the value shown in the table is the RL.

Outside
East Yard
Outside
South
IA-1
IA-2
IA-3
OA-4
OA-5
OA-6
Outside
North
Indoor air sample results were compared to San Francisco Bay RWQCB Indoor Air Vapor Intrusion Human Health Risk Levels - Commercial/Industrial ESL, Lower of Cancer Risk and Noncancer Hazard Values (July 2019). Outdoor air sample results do not have applicable comparison criteria and are shown for informational purposes.

Results of Indoor Air Sampling, Former Semco Twist Drill & Tool Company, 2936 Industrial Parkway, Santa Maria, California, dated 7 April 2021 by Analytical Consulting Group, Inc.

Results of Second Round Indoor Air Sampling, Former Semco Twist Drill & Tool Company, 2936 Industrial Parkway, Santa Maria, California, dated 11 February 2022 by Analytical Consulting Group, Inc.

Indoor Samples
Volatile Organic Compounds
Analyte
South
Shop Area
Office
Storage
Building
CAS Number
Indoor Air VI Commercial/Industrial ESL
Location
1

Page 1 of 1 ends

Attachment B

APPENDIX D

PERMIT APPLICATION FORMS

Attachment B

CITY OF SANTA MARIA DEPARTMENT OF UTILITIES

INDUSTRIAL WASTEWATER DISCHARGE

PERMIT APPLICATION

All businesses within the City of Santa Maria are required to complete an industrial wastewater discharge permit application. Use current operating data, if available, or your best estimate based on similar types of businesses. Please answer all questions as thoroughly as possible. If a question is inapplicable to your industry, please indicate. Incomplete applications shall be returned.

COMPANY INFORMATION

1. Company Name:

2. Facility Address:

3. Mailing Address:

4. Email Address

5. Facility Contact (name, title, telephone number:

6. Property Owner:

7. Principal Business Activity Conducted at this Facility:

8. What is the most convenient time of the workday for Regulatory Compliance staff to visit your facility?

9. Average Number of Employees: Days & Hours of Operation:

10. Wastewater Generating Processes (check all that apply) None (no water to building)
Automotive
Car Wash
Dental Office
Medical Office
Mortuary
Photographic processing
Electroplating or anodizing
Equipment washing or rinsing
Sanitary restrooms
Cafeteria or kitchen
Food processing, freezing, packaging
Laboratory
Dry cleaning
Laundry facilities
Print shop
Other (describe):

Describe wastewater generating processes checked above (attach additional sheets if necessary):

11. Do you have a sand and oil trap or clarifier? If yes, what size? Location:

12. Do you have a grease trap or interceptor ? If yes, what size? Location:

13. Do you have any other type of trap? If yes, what kind ? Location:

14. If the response for #10 ,#11, or #12 is YES, how often is the trap/clarifier/interceptor cleaned?_______________________

15. If the response for #10, #11, or #12 is YES, who performs the cleaning?_________________________________________

16. Please describe chemicals or other substances used in your processes which may enter your wastewater and the City's sewer system. Describe any alternate disposal methods (i.e., recycling, hauling) employed or contracted by you for substance disposal:

17. Do you have floor drains, floor sinks, or any other disposal connection to the City's sewer system other than restroom facilities? If yes, please describe:

18. Average volume of water used each month: Account Number:

From? City of Santa Maria or Cal-Cities If water or sewer charges are paid by someone other than your business; please provide name, address, and phone number:

19. Please estimate what percentage of total water consumed at your facility is used for each of the following (total =100%):

Employee Kitchen/Break Room Restrooms Landscape Irrigation Business Production or Process Industrial Other (explain) For City Use Only
New Applicant Renewal
-0-Discharge Class III
Class I Class IV
Class II (SIU or CIU)

Permit No:

NAIC Code:

Attachment B

CITY OF SANTA MARIA DEPARTMENT OF UTILITIES

INDUSTRIAL WASTEWATER DISCHARGE

PERMIT APPLICATION

20. List chemicals or fuels stored at this facility (attach separate sheets if necessary) that, in the event of unforeseen occurrence or accident, could create a spill event:

21. Container types : Drums Tanks Bottles Other Material types : Waste Pure Product

22. Please describe any alternate disposal methods (i.e., recycle, haulers) employed or contracted by you for disposal of stored substances:

23. Does this facility currently hold a National Pollutant Discharge Elimination System (NPDES) Permit? If yes, Permit number is: List substances regulated by NPDES Permit:

24. Does this facility discharge any substances associated with industrial activities (i.e. boiler, cooling tower condensate, process wastewater, etc.) to the City's stormwater system? If yes, please describe:

25. Are any processes performed out of doors that may cause accidental or incidental contact of industrial substances with stormwater? If yes, list the processes, equipment, materials, including raw materials, intermediates or products, that may become exposed to stormwater:

26. Does this facility store any materials or substances outdoors, which may come into contact with storm water? If yes, list the materials stored outdoors:

27. Are any control measures, (i.e. berms, secondary containment) used to prevent substances from entering storm drains from any outdoor activities or storage? If yes, please describe:

28. Do you have an emergency spill clean-up plan? If yes, please attach.

The above information is accurate to the best of my knowledge and is based on (check one):

Current operating data Best estimate based on
Other (explain):

This application was completed by (please print):

Name/Title: Phone No :

Signature: Date:

Please Return to:

City of Santa Maria Utilities Department
Regulatory Compliance Division
2065 East Main Street
Santa Maria, CA 93454
FAX: 805-928-7240
Email: [email protected]

Attachment B
Pilot Test Soil Remediation
Application Form -07B
Santa Barbara County Air Pollution Control District
260 N. San Antonio Road, Suite A
Santa Barbara, CA 93110-1315
Use this form to request an exemption from permit requirement for conducting a soil vapor extraction pilot test for soil remediation projects. Based upon review of the submitted data, the APCD will issue a letter of exemption from permit requirement or request applications for permits to construct (install) and to operate equipment. Mail the completed form(s) and appropriate filing fee (see Schedule F.11 of Rule 210 http://www.ourair.org/wp-content/uploads/cpi-fees.pdf) at least thirty (30) days before estimated project start-up to the Air Pollution Control District (APCD) at the above address.

APCD -07B (07/01/2024)
For APCD use only. FID # App. #
Position/Title
Equipment Owner Info
Text Field
Doing Business As
Contact Name
Mailing Address
City State Zip Code
Telephone Cell Email
Use as Billing Contact? Yes No
Company Name
Position/Title
Equipment Operator Info
Company Name
Doing Business As
Contact Name
Mailing Address
City State Zip Code
Telephone Cell Email
Use as Billing Contact? Yes No
Facility Address/Location
Current APCD Permit # (if any)
<draw h="6.35mm" Assessors Parcel No(s)
Facility Information
Position/Title
Property Owner Info
Text Field
Doing Business As
Contact Name
Mailing Address
City State Zip Code
Telephone Cell Email
Use as Billing Contact? Yes No
Company Name
Attachment B
Type of Soil Contaminants (Check all that apply)
Gasoline
Dioxins/Furans (list)
Crude Oil
Polycyclic Aromatic Hydroxcarbons (list)
Chlorinated Hydrocarbons (list)
Diesel
Metals (list)
Polychlorinated Biphenyls (list)
Other (list)
Source of Contamination (Check all that apply)
Leaking Underground Storage Tank Dry Cleaning Operation PesticidesOil & Gas Production
Other (describe)
Provide a detailed description of the soil vapor extraction equipment and associated emission controls. List normal operating parameters (e.g., temperature, flow rate, pressure, et cetera).

Equipment Description
Number of wells to be tested Duration of each well test Daily operating schedule Total test duration*
Estimated end dateEstimated start date
Operating Schedule
APCD -07B (07/01/2024)

Page 2 of 4 ends

Application Form -07B
*If the test duration exceeds 15 days, submit a completed APCD Form -01 and this Form -07B. A permit is required.

Authorized Agent Info*
Position/Title
Company Name
Doing Business As
Contact Name
Mailing Address
City State Zip Code
Telephone Cell Email
Use as Billing Contact?
*Use this section if the application is not submitted by the owner/operator and provide a completed Form -01A. Owner/Operator information above is still required.

Yes No
Attachment B

Page 3 of 4 ends

Application Form -07B
APCD -07B (07/01/2024)
Emissions Estimate (Attach calculations and assumptions) lb/hr lb/day
Reactive Organic Compounds (ROC)
Nitrogen Oxides (NOx)
Particulate Matter (PM)
Carbon Monoxide (CO)
Sulfur Oxides (SOx)
School Information
Is the remediation site property boundary line located within 1,000 feet of a school (k-12)? If yes, provide school name and address.

Yes No
If the remediation site is located within 1,000 feet of a school, can work activities occur outside of school hours (e.g., weekends, summer, holidays)? If yes, submit documentation from the school(s) to show that your operating schedule above conforms accordingly. If no, submit a completed APCD Form -03 (School Summary Form), APCD Form -01 and APCD Form -77. A permit is required.

School name School address
Yes No
Applicant/Preparer Statement
The person who prepares the application also must sign this form. The preparer may be an employee of the owner/operator or an authorized agent (contractor/consultant) working on behalf of the owner/operator (an Authorized Agent Form -01A is required).

I certify pursuant to H&SC Section 42303.5 that all information contained herein and information submitted with this application is true and correct.

Completed By
Signature Date
Company
Power Source
*If the generator engine size exceeds 50 bhp and does not have a valid PERP Certificate, a permit is required.

Grid Electrical Power Portable Generator Other (describe) Generator PERP Certificate Number *
Generator Engine Size (bhp)Generator Fuel Type
Provide information on the power source for the soil vapor extraction equipment. Please note portable engines with a valid California Portable Equipment Registration Program (PERP) certificate may operate under this pilot test exemption.

Attachment B

Page 4 of 4 ends

Application Form -07B
Application Checklist (Have you submitted all the required information? Please check off the boxes) Exemption Filing Fee (Fee = $862. This fee is COLA adjusted every July 1st. Please ensure you are remitting the current fee. See schedule F.11 of Rule 210 http://www.ourair.org/wp-content/uploads/cpi-fees.pdf ) Attached copy of Work Plan submitted to the Public Health Department and the Public Health Department approval letter. The APCD will not issue an exemption or permit without the Work Plan and approval letter.

Process flow diagram (piping and instrumentation) of the proposed test equipment.

Form -01A (Authorized Agent Form) attached if this application was prepared by and/or if correspondence is requested to be sent to an Agent Authorized (e.g., contractor or consultant). This form must accompany each application.

Form -03 (School Summary Form) attached if the project's property boundary is within 1,000 feet of the outer boundary of a school (k-12) and you want to perform work during school hours.

PLEASE NOTE THAT FAILURE TO COMPLETELY PROVIDE ALL REQUIRED INFORMATION OR FEES WILL RESULT IN YOUR APPLICATION BEING RETURNED OR DEEMED INCOMPLETE.

Emission calculations and assumptions.

APCD -07B (07/01/2024)
\\sbcapcd.org\shares\Groups\ENGR\LIBRARY\Permitting\Application Forms\apcd-07B.doc Attachment B

Page 4 of 4 ends

Application Form -07B
APCD -07B (07/01/2024)
NOTICE OF CERTIFICATION:

All applicants must complete the following Notice of Certification. This certification must be signed by the Authorized Company Representative representing the property owner. Signatures by Authorized Agents will not be accepted.

NOTICE of CERTIFICATION
(hereinafter referred to as the applicant), and certify pursuant to H&SC Section 42303.5 that all information contained herein and information submitted with this application is true and correct and the equipment listed herein complies or can be expected to comply with said rules and regulations when operated in the manner and under the circumstances proposed. If the project fees are required to be funded by the cost reimbursement basis, as the responsible person, I agree that I will pay the Santa Barbara County Air Pollution Control District the actual recorded cost, plus administrative cost, incurred by the APCD in the processing of the application within 30 days of the billing date. If I withdraw my application, I further understand that I shall inform the APCD in writing and I will be charged for all costs incurred through closure of the APCD files on the project.

For applications submitted for Authority to Construct, modifications to existing Authority to Construct, and Authority to Construct/Permit to Operate permits, I hereby certify that all major stationary sources in the state and all stationary sources in the air basin which are owned or operated by the applicant, or by an entity controlling, controlled by, or under common control with the applicant, are in compliance, or are on approved schedule for compliance with all applicable emission limitations and standards under the Clean Air Act (42 USC 7401 et seq.) and all applicable emission limitations and standards which are part of the State Implementation Plan approved by the Environmental Protection Agency.

I agree that as property owner I am ultimately responsible for all activities related to this project. This includes compliance, operations, and the oversight of authorized agents and equipment owners/operators. It is my responsibility, as the property owner, to notify the APCD using the Form APCD-01T of any change to the equipment operator, equipment owner, or authorized agent. within 30 days of the change.

I, , am employed by or represent
Type or Print Name of Authorized Company Representative Type or Print Name of Business, Corporation, Company, Individual, or Agency Completed By: Title:

Date: Phone:

Signature of Authorized Company Representative
Attachment B
Contaminated Soil and/or Groundwater Clean-Up
Application Form -77
Santa Barbara County Air Pollution Control District
260 N. San Antonio Road, Suite A
Santa Barbara, CA 93110-1315
Use this form to request a permit for contaminated soil and/or groundwater clean-up projects. This includes gasoline, crude oil , dry cleaning fluids, metals and any other soil contaminated with toxic, hazardous or volatile compounds. Mail the completed form(s) and appropriate filing fee (see Rule 210 Schedule F.1 https://www.ourair.org/wp-content/uploads/cpi-fees. pdf) at least 120 days before estimated project start-up to the Air Pollution Control District (APCD) at the above address.

APCD -77 (07/01/2024)
For APCD use only. FID # App. #
Facility Address/Location
Current APCD Permit # (if any)
<draw h="6.35mm" Assessors Parcel No(s)
Is the remediation site property boundary line located within 1,000 feet of a school (k-12)? If yes, provide school name and address.

Yes No
Yes No
School name School address
If the remediation site is located within 1,000 feet of a school, can work activities occur outside of school hours (e.g., weekends, summer, holidays)? If yes, provide correspondence from the school district that confirms that no school activities will occur during this time period. If no, submit a completed APCD Form -03 (School Summary Form).

Daily Operating Schedule
Proposed Start Date
To
Proposed End Date
I. Operating Schedule (include estimated start date, end date, and daily operating schedule) II. Cleanup Method Type of Facility (former dry cleaner, gasoline station, etc.) In-Situ Vacuum Extraction Liquid/Air Stripper
Above Ground Vacuum ExtractionBio-Reclamation
Other (describe)
Dual Phase Extraction Single Phase Extraction Yes NoWill Air Sparging be used? III. Extent of Contamination and Soil Information
Cubic ft Bulk Density of Soil? Ton/Cubic ftEstimated Contaminated Volume? Average Intrinsic Permeability of the Contaminated Soil? cm^2 Depth to Groundwater? ft. BGS Attachment B
IV. Type of Soil Contaminants (Check all that apply above 0.2 PPM and define maximum inlet concentration to control device 1 )
Total ROC2 ppmvd
Tetrachloroethene (PCE) ppmvd
Ethylene Dichloride (DCE) ppmvd
Trichloroethylene (TCE) ppmvd
Benzene ppmvd
Toluene ppmvd
EthylBenzene ppmvd
Xylene ppmvd
Other ppmvd
Vinyl Chloride (Chloroethylene) ppmvd Methyl Tert-Butyl Ether (MTBE) Yes No Is a pilot test report or detailed analysis confirming the above inlet concentrations included in this application? If not, provide the detailed basis for how the values were determined as a separate attachment. 2 See District Rule 102 for the definition of ROC. For permitting purposes, list the maximum total hydrocarbon concentration detected by a PID calibrated to isobutylene.

1. If dilution is used, enter contaminant concentration in ppmvd entering control device after dilution. ppmvd
ppmvd Xylene
Other ppmvd
Other ppmvd
Other ppmvd
Other ppmvd
APCD -77 (07/01/2024)
Contaminated Soil and/or Groundwater Clean-Up
Application Form -77

Page 2 of 6 ends

V. Well Information
Number of Injection Wells Number of Extraction Wells
Diameter of Wells
Extraction Wells Injection Wells
Maximum Depth ft. deep Maximum Depth ft. deep
Well Spacing ft.

Radius of Influence ft.

SCFM Design Flowrate
Yes Ambient Air Used? No
ft. Diameter of Wellsft.

Other ppmvd Other ppmvd
Blower Power Source (electric, diesel, etc):

Manufacturer: Model:

Horsepower: HP
Design Flow Rate: To MIN SCFMMAX SCFM
VI. Vacuum Extraction Blower
Attachment B

Page 3 of 6 ends

APCD -77 (07/01/2024)
VIII. Stack Parameters ft. Stack Diameter:Exhaust Stack Height: in.

Design Flow Rate: To MIN SCFMMAX SCFM
Gas Exit Velocity: To MIN ft/secMAX ft/sec
Exhaust Temperature: To MIN FMAX F
NoYesExhaust Blower Used?
Manufacturer: Model:

Horsepower: HP
Thermal Oxidizer (Phase I) District assumes 98% control efficiency for all calculations Max Capacity: Heat Rating:SCFM Fuel Type: MMBTU/hr
Operating Temperature: F To F Fuel Consumption rate:

Catalyst Type/Material:

Catalyst Life Expectancy:

Catalyst Specific Information:

Manufacturer Model
Carbon Adsorption (Phase III)
MAX Flowrate: SCFMSCFM
Operating Temperature: F To F Carbon Weight Per Cannister: Lb Flowrate Operating Range MIN Flowrate:

Replacement Schedule:

District assumes 90% control efficiency for all calculations Catalytic Oxidizer (Phase II) District assumes 95% control efficiency for all calculations Max Capacity: Heat Rating:SCFM Fuel Type: MMBTU/hr
Operating Temperature: F To F Fuel Consumption rate:

Manufacturer Model
Manufacturer Model
VII. Control Device (Fill out applicable section)
Internal Combustion Engine
Max Capacity: SCFM Heat Rating:Horsepower: HP MMBTU/hr Number of Cylinders: Fuel Consumption rate:

Manufacturer Model
Aux Fuel Type:

Combustion Temperature: F NoYes Manifolding: Air Stripper Used? Attachment B
APCD -77 (07/01/2024)

Page 4 of 6 ends

IX. Monitoring Systems (Fill out all that apply )
System Parameter
Control Device Inlet Temp (F)
Stack Outlet Temp (F)
Control Device Inlet Gas Flow (SCFM)
Stack Outlet Gas Flow (SCFM)*
Control Device Inlet Pressure (PSIG)
Control Device Outlet Pressure (PSIG)
System Influent Flow Rate (SCFM)
Catalytic Oxidizer Bed Temp (F)*
Amount of Supplemental Fuel Used**
Instrument Manufacturer Instrument Model Calibration Schedule *
Required for thermal oxidizer and catalytic control devices.

**
Required for systems which use fossil fuel (e.g., Diesel oil, natural gas, propane) for any device within the system (e.g, thermal oxidizer, pump driven by an internal combustion engine)
X. Air Dilution (Fill out if air dilution will be used at the control device inlet ) Max Dilution Air FlowrateEstimated Turndown Ratio: SCFM Dilution Air Temperature: To MIN FMAX F
NoYesAmbient Air Used?
Manufacturer: Model:

Horsepower: HP
Air Dilution Blower Information
XI. Electrical Generator Engines (Fill out all that apply ) Portable Engine Information
NoYesPortable Engines Used? Grid Power Used? Yes No
*Horsepower:Fuel Type (gas, diesel, etc):
* If the portable engine is over 49 bhp, fill out the appropriate APCD form listed below for the engine and submit it with this application.

Form 34P - Diesel Fired Primary Engine Application

Form 70 - Spark Ignited IC Engine Application (natural gas, propane, gasoline) Attachment B
APCD -77 (07/01/2024)

Page 5 of 6 ends

An Emissions Verification Test Plan consistent with the District's Guidance Document (Form 07). The District will not issue an ATC permit unless the Test Plan meets District requirements.* Maximum influent and effluent concentration calculations using the District default control efficiency for the applicable control device. (98% for Thermal Oxidizer, 95% for Catalytic Oxidizer, 90% for Carbon Adsorption) Attached copy of any government agency's order to remediate the site (if applicable).* Form -01A (Authorized Agent Form) attached if this application was prepared by and/or if correspondence is requested to be sent to an Authorized Agent (e.g., contractor or consultant). This form must accompany each application.

Form -03 (School Summary Form) attached if the project's property boundary is within 1,000 feet of the outer boundary of a school (k-12) and you want to perform work during school hours.

Form -01 (General Permit Application Form) required for every permit application.

Form-15S (Health Risk Assessment Screening Application Form) required for every contaminated soil/groundwater cleanup project. Note that the HRA screening fee is not required as APCD costs will be assessed on an hourly basis.

Pilot test or other analytical analysis confirming inlet concentrations of contaminants to the control device.

Attached facility plot showing tank locations, property line and surrounding area up to 2,500 feet away. Identify all land uses in the area and highlight sensitive areas such as schools, residential areas, restaurants and shopping areas.

List of all equipment, supporting manufacturer information and a process flow diagram for the equipment.

Application Checklist (Have you submitted all the required information? Please check off the boxes) Permit Fees (Fee = $3,065). This includes an application filing fee of $565 plus a cost reimbursement deposit of $2,500 to cover hourly costs for APCD staff time.

A copy of the approved lead agency site remediation plan.*

PLEASE NOTE THAT FAILURE TO COMPLETELY PROVIDE ALL REQUIRED INFORMATION OR FEES WILL RESULT IN YOUR APPLICATION BEING RETURNED OR DEEMED INCOMPLETE.

Applicant/Preparer Statement
The person who prepares the application also must sign this form. The preparer may be an employee of the owner/operator or an authorized agent (contractor/consultant) working on behalf of the owner/operator (an Authorized Agent Form -01A is required).

I certify pursuant to H&SC Section 42303.5 that all information contained herein and information submitted with this application is true and correct.

Completed By
Signature Date
Company
Applicant/Preparer Statement
The person who prepares the application also must sign this form. The preparer may be an employee of the owner/operator or an authorized agent (contractor/consultant) working on behalf of the owner/operator (an Authorized Agent Form -01A is required).

I certify pursuant to H&SC Section 42303.5 that all information contained herein and information submitted with this application is true and correct.

Completed By
Signature Date
Company
* Submit both a paper and electronic PDF copy of these documents.

Attachment B
APCD -77 (07/01/2024)

Page 6 of 6 ends

NOTICE OF CERTIFICATION:

I, , am employed by or represent
Type or Print Name of Authorized Company Representative Type or Print Name of Business, Corporation, Company, Individual, or Agency Completed By: Title:

Date: Phone:

Signature of Authorized Company Representative
NOTICE OF CERTIFICATION:

I, , am employed by or represent
Type or Print Name of Authorized Company Representative Type or Print Name of Business, Corporation, Company, Individual, or Agency Completed By: Title:

Date: Phone:

Signature of Authorized Company Representative
Attachment B

APPENDIX E

CONTINGENCY RETROFIT VAPOR MITIGATION SYSTEM BASIS OF
DESIGN

Attachment B

APPENDIX E
Contingency Retrofit Vapor Mitigation System Basis of Design

On behalf of the County of Santa Barbara, the City of Santa Maria, and the Santa Maria Public Airport District (Agencies), Langan CA, Inc. (Langan) has prepared this Basis of Design for a Contingency Retrofit Vapor Mitigation System (Contingency VMS BOD) for the former SEMCO Twist Drill and Tool Company, Inc., (SEMCO) Site located at 2926, 2936, 2946, 2956, 2976, and 2986 Industrial Parkway in Santa Maria, California (the “Site”). This Contingency VMS BOD is an appendix to the Work Plan for Onsite Soil Vapor Extraction (SVE Work Plan) and the VMS retrofit will be installed concurrently with the SVE system construction. Operation of the VMS is contingent on the soil vapor concentrations following SVE system operation and sampling as set forth in the Settlement Agreement.

This Contingency VMS BOD is intended to provide a conceptual VMS design that will be installed concurrently with the SVE system construction and operated after SVE completion if greater than 1x10-5 human health vapor intrusion risk remains beneath the on-site SEMCO building, as outlined in the Settlement Agreement. The VMS is intended to operate, if needed, in the area beneath the building with greater than 1x10 -5 vapor intrusion risk after SVE operation (target area). The purpose of the contingency VMS is to provide a preferential pathway for vapors that may be present beneath the building in the target area to be readily released to the atmosphere instead of potentially migrating through the foundation slab and into indoor air.

This Contingency VMS BOD provides a VMS schematic depicting the major system components (Figure E1) and is generally guided by the California Department of Toxic Substances Control’s (DTSC) Final Vapor Intrusion Mitigation Advisory, Revision 1, dated October 2011 (DTSC, 2011).

1.0 PASSIVE VAPOR COLLECTION AND VENTING SYSTEM
The contingency VMS is intended to be a passive air inlet and venting system and will consist of a horizontal collection and venting system installed below the building slab t o allow soil vapors that may otherwise collect beneath the slab to instead migrate and vent to the atmosphere outside the building. These features are described in greater detail in the following paragraphs and a conceptual design is shown on Figure E1.

The VMS will be installed in the target area which is below the eastern building slab within the planned SVE operations area where elevated trichloroethene (TCE) concentrations currently exist.

The VMS will consist of two 3-inch diameter perforated schedule 40 polyvinyl chloride (PVC) or high-density polyethylene (HDPE) pipes installed in the two conveyance piping trenches beneath the building that will be constructed as part of the SVE system; approximate locations are shown on Figure E1 . The perforated pi pes are intended to be installed parallel to the solid vapor well lines for the SVE system within the trenches and the two perforated pipes will manifold at a single location outside the building at the riser. The VMS pipes will not connect to the SVE system. The perforated pipe sections will have three 5/8-inch diameter holes across the upper one-third of the pipe at a spacing of three inches on center and periodic 5/8-inch diameter holes on the underside of the pipe to allow potential water from condensation to drain from the pipe.

Attachment B
Contingency Retrofit Vapor Mitigation System Basis of Design 2926, 2936, 2946, 2956, 2976, and 2986 Industrial Parkway Santa Maria, California
22 September 2025
781016901

Page 2 of 2 ends

1.1 Risers and Vent Caps
A single vent riser is proposed for the target area. The riser will be fitted with vent caps (Vacu - Stack® Model VSS or equivalent), which will allow the vapors to be released to the atmosphere at the roof level. Both subsurface perforated pipes will manifold into one riser pipe outside the building.

The riser will be constructed of 3 -inch-diameter ductile iron pipe, cast iron pipe, or galvanized steel pipe and will be labeled “CONTAINS VAPORS; DO NOT BREAK OR CUT”. The top of the riser pipe will extend to an elevation of one foot above the wind screen, roof parapet, or top edge of the roof level, and the top of the riser will be located a minimum of 15 feet away from fresh air intakes for the building’s heating, ventilation, and a ir conditioning (HVAC) system or other openings (windows, doors, etc.). T he riser will be constructed of threaded pipe, or blank pipe connected with chemically resistant no -hub couplings . Although the VMS is intended to be entirely passive the riser could be fitted with a radon fan, if required.

1.2 Perimeter Inlet Vent
If a gravel or high permeability layer is present beneath the building slab, one perimeter inlet vent will be considered as part of the VMS design (Figure E1). The purpose of the perimeter inlet vent is to facilitate convective airflow up the vertical riser pipe of the collection and venting system by allowing fresh air to enter the space beneath the building slab. The inlet vent would be embedded into the gravel layer under the building and daylight at the exterior building face. The inlet vent would be constructed of 3-inch-diameter PVC piping, positioned at least of 36-inches away from operable windows and door jams , and the exterior inlet opening w ould be scre ened to limit intrusive material, as feasible.

2.0 CONSTRUCTION OBSERVATION
Construction observation will be performed during the installation of the SVE system and documented in the SVE Construction Completion Report.

3.0 SUMMARY
This conceptual VMS will be constructed concurrently with the SVE system outlined in the SVE Work Plan and operated after SVE completion if required by detected soil vapor concentrations.

In accordance with the Settlement Agreement requirements, VMS operation is applicable if concentrations of TCE likely remain in the subsurface beneath the SEMCO building above 3,000 µg/m3.

After installation, the VMS shall be owned, operated, and the responsibility of the current owner(s). Maintenance, repairs, and any other operation needs for the VMS shall be the responsibility of the current owner(s).

Enclosures: Figure E1 – Conceptual Vapor Mitigation System Schematic

Attachment B

FIGURE

Attachment B
E1
SEMCO
Attachment B

Santa Maria City CouncilOctober 21, 2025

Santa Maria City Council
October 21, 2025