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28 August 2017 AdvancedGeo AGE Project No. 14-3096 n vi ro n m e n la l Page 3 of 7 grab groundwater samples; and one (1) soil boring to a maximum depth of 90 feet for collection of grab groundwater samples and subsequently converted to a Zone B- screened groundwater monitoring well at depths between 50 and 65 feet below surface grade (bsg). The soil borings will be advanced using a truck-mounted drill rig equipped with 8.25-inch hollow-stem augers. The total depth of the soil borings/monitoring well may vary according to geologic/hydrogeologic conditions encountered during drilling. Relative to existing site conditions, the location of the proposed soil borings are as follows: • One soil boring, converted to a monitoring well (MW-14) will be located approximately 350 feet northwest of the P-12 soil boring area, and approximately 730 feet northwest of the former UST area at the site; • One soil boring (P-16) will be located approximately 280 feet north of the P-15 soil boring area, and approximately 580 feet north-northwest of the former UST area at the site; • One shallow 5-foot soil boring (P-17) will be located approximately 20 feet west of monitoring well MW-7 (former UST area); • One soil shallow 5-foot boring (P-18) will be located approximately 25 feet northeast of monitoring well MW-7 (former UST area); and • One soil shallow 5-foot boring (P-19) will be located approximately 20 feet south of monitoring well MW-7 (former UST area). The proposed soil boring locations are illustrated in Figures 2 and 3. 2.3. SOIL AND GRAB GROUNDWATER SAMPLING Shallow five-foot soil samples and multiple grab groundwater samples will be collected from all five proposed soil boring locations and will be analyzed by a State of California Department of Public Health (CDPH)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) in accordance with EPA Method 8015M; and • Volatile organic compounds (VOCs) including benzene, toluene, ethylbenzene, and total xylenes (BTEX), and fuel additives methyl tertiary-butyl ether (MTBE), tertiary-butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2-dibromoethane (EDB), 1,2- dichloroethane (1,2-DCA), tetrachloroethylene (PCE), trichloroethylene (TCE), and Naphthalene in accordance with EPA Method 82608.