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Geospte& <br /> consultants <br /> 1.3.1 Groundwater Monitoring Results for August 2021 <br /> Groundwater samples collected from the shallow and deep wells were analyzed for total <br /> petroleum hydrocarbons (TPH; C28-C40), TPH-g, TPH as diesel (TPH-d), BTEX, and <br /> naphthalene. The analytical results for each well sampled are shown in Figures 4 and 5. The <br /> analytical data were screened using the San Francisco Bay Regional Water Quality Control <br /> Board's (SFBRWQCB) Environmental Screening Levels (ESLs) for Direct Exposure Human <br /> Health Risk Levels—MCL Priority (Table GW-1; SFBRWQCB, 2019). The analytical results <br /> indicated that in shallow groundwater, the ESLs for TPH-g, TPH-d, and benzene were exceeded <br /> only in well 917-10, located approximately 75 feet east of the tank excavation(Figure 4). None <br /> of the petroleum constituents analyzed for in August 2021 were detected above the ESL in the <br /> deep groundwater wells (Figure 5). <br /> Final Investigation Work Plan Addendum—UST 817B 3 June 24,2022 <br />