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l <br /> i <br /> 2.0 <br /> FIELD INVESTIGATION <br /> :., The following sections describe the field activities to evaluate the extent of petroleum <br /> contamination at the former gasoline tank location. The soil samples taken during the <br /> gasoline tank removal operation identified elevated levels of TPH(gasoline)and BTEX. The <br /> following sections also describe soil and groundwater sampling procedures (if required). <br /> �. 2.1 SOIL <br /> Three borings will be advanced around the gasoline tank excavation with a truck mounted <br /> drill rig equipped with hollow stem augers (Figure 2). The borings will be advanced to: <br /> fifty feet below the ground surface, if contamination or groundwater is not <br /> z <br /> encountered; or <br /> a depth of twenty-five feet below the deepest observed contamination, if <br /> groundwater is nbt encountered; or <br /> • ten feet below the groundwater surface; or <br /> • refusal or a maximum depth of 00 feet, if none of the above condtions i; <br /> satisfied. <br /> z <br /> Soil samples will be collected every five feet with a California modified sampler. The <br /> borings will be logged according to the Unified Soil Classification System. The cuttings from <br /> the borings will be placed in the soil stockpiled from the gasoline tank,removal operations. <br /> The soil samples will be measured in the field for organic vapor concentration using an <br /> i� <br /> organic vapor detector (photoionizadon meter, organic vapor analyzer or equivalent). A <br /> maximum of ten soil. samples above the groundwater interface (if encountered) will be . <br /> selected for analytical analysis based on the results of the org <br /> carie vapor detector and on <br /> visual observation of the soil conditions. The samples selected for analysis to estimate the <br /> following: <br /> 91CO2M111AJ1111MAflT.WA 07.03-111FS1P �.t <br />