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Explanation CB-1 (7/07/19) Depth: 5-10 ft bgs O dN Depth: 0-5 ft bgs TPH-g: <0.16 mg/kg:<0.18 mg/kg(duplicate) Soil Gas Well MW-3A TPH-g: <0.18 mg/kg TPH-d: Not Analyzed :5.9Y mg/kg(duplicate) BTEX: <4.5 pg/kg BTEX: <3.5 pg/kg :<4.4 pg/kg(duplicate) Soil Boring MTBE: <4.5 pg/kg MTBE: <3.5p9/k9 <4.4 p9/k9(duplicate) ) Naphthalene:<4.5 pg/kg Naphthalene:<3.5 pg/kg :<4.4 pg/kg(duplicate) Monitoring Well BaP Equiv: 63.6 Ng/kg BaP Equiv: 26.3 lag/kg:64.1 lag/kg(duplicate) _ I _ Excavation MW-7 v � O F Former Underground + � Storage Tank bgs=below ground surface mg/kg=milligrams per kilogram i5l pg/kg=micrograms per kilogram pg/m3=micrograms per cubic meter r TPH=total petroleum hydrocarbons P TPH-d=TPH as diesel ,k+ TPH-g=TPH as gasoline . B=Benzene N T=Toluene "'***�� 01 co E=Ethyl benzene �- X=Xylenes(total) MTBE=Methyl tert-butyl ether BaP Equiv=Benzo[a]pyrene equivalent + • CB-4(7/07/19) aw Depth: 0-5 ft bgs Depth: 5-10 ft bgs TPH-g: <0.19 mg/kg TPH-g: <0.20 mg/kg y SV-1 (5 ft bgs) 1 TPH-d: 1.2Y mg/kg TPH-d <1.2 mg/kg BTEX: <4.0 pg/kg BTEX: <5.1 pg/kg SV-2(5 ft bgs) 12/18/19 MTBE: <4.0 pg/kg MTBE: <5.1 pg/kg Depth: 5 ft bgs TPH-g:2,000J lag/m' ,qtr Naphthalene:<4.0 pg/kg Naphthalene:<5.1 pg/kg 12/18/19 BTEX: ND BaP Equiv: 4.6 pg/kg BaP Equiv: 5.4 lag/kg TPH-g:1,800J lag/m3 MTBE: ND + BTEX: ND Naphthalene: ND CB-5(7/07/19) MTBE: ND 7/28/20 Depth: 0-5 ft bgs Depth: 5-10 ft bgs Naphthalene: ND TPH-g:800J lag/m' TPH-g: <0.16 mg/kg TPH-g: <0.18 mg/kg 7/28/20 BTE: ND TPH-d: <1.0 mg/kg TPH-d <1.2 mg/kg TPH-g:290J N9/m' Xylenes:0.20J lag/m3 BTEX: <4.6 pg/kg BTEX: <4.2 pg/kg BTEX: ND MTBE: ND MTBE: <4.6 pg/kg MTBE: <4.2 pg/kg MTBE: ND Naphthalene: ND Naphthalene: <4.6 pg/kg Naphthalene:<4.2 pg/kg Naphthalene: ND BaP Equiv: 4.6 pg/kg BaP Equiv: 5.3 lag/kg CB-2(7/07/19) _ Depth: 0-5 ft bgs -1 MW72� CB-3(7/07/19) TPH-g: <0.18 mg/kg ` Depth: 0-5 ft bgs TPH-d: 2.3 mg/kg _ r TPH- <0.17 mg/kg BTEX: <4.2 pg/kg MW=10 TPH d: 2.3 mg/kg MTBE: <4.2 pg/kg 1 t BTEX: <4.6 pg/kg Naphthalene:<4.2 pg/kg 1 MTBE: <4.6 pg/kg _ BaP Equiv: 130.9 lag/kg y Naphthalene:<4.6 pg/kg Depth: 5-10 ft bgs a TPH-g: <0.16 mg/kg BaP Equiv: 16.9 lag/kg y ' � '`� Depth: 5-10 ft bgs TPH-d: 2.6Y mg/kg TPH-g: <16 mg/kg BTEX: <3.9 pg/kg TPH-d: 1.3Y mg/kg MTBE: <3.9 pg/kg w I BTEX <5.3 pg/kg Naphthalene:<3.9 pg/kg MTBE: <5.39 pg/kg BaP Equiv: 5.3 pg/kg Naphthalene:<5.3 pg/kg Depth: 27-30 ft bgs BaP Equiv: 6.1 lag/kg TPH-g: 61Y mg/kg Depth: 27-30 ft bgs TPH-d: 100Y mg/kg TPH-g: <0.17 mg/kg BTX: <230 pg/kg TPH-d: <1.2 mg/kg Ethyl benzene: 380 lag/kg BTEX: <4.6 pg/kg MTBE: <230 pg/kg _ $treat j MTBE: <4.6 pg/kg Naphthalene: 750 lag/kg �i+ ,ngt011 Naphthalene:<4.6 pg/kg BaP Equiv: 25.4 lag/kg Wlash BaP Equiv: 5.3 lag/kg PREPARED FOR: FIGURE 2-3 t County of San Joaquin 2019 SOIL AND SOIL GAS SAMPLING PREPARED BY: Capital Projects SAN JOAQUIN COUNTY 0 Scale in Feet 30 Weston Solutions, Inc. 44 N San Joaquin St,Ste 590 HUMAN SERVICES AGENCY 2600 Dallas Pkwy,Ste 280 Stockton,CA 95202 145 SOUTH SUTTER STREET 1:240 Frisco,TX 75034 STOCKTON,CALIFORNIA 95202 Project No.:03733.025.005.0001