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4 <br /> W <br /> a <br /> 8720033A-COT-4 <br /> 3.0 PURPOSE AND SCOPE <br /> The purpose of this investigation was to assess the extent to which - <br /> gasoline and gasoline components occur in soil and groundwater in the <br /> vicinity of the four underground gasoline storagetankslled <br /> at Call tans to Shop <br /> 10, To acco;nY;ish this, four soiwaslp�aced5onwere eachdside of the tank cluster <br /> cluster of tanks. 0ne baring and down groundwater <br /> in order to assess sail and water quality both up <br /> gradient. Groundwater monitoring w:: Ils in all the borings were <br /> completed. Soil and groundwater samples were collected in accordance with <br /> vironmental laboratory and <br /> contract specifications and submitted to WCC'S en <br /> a. an independent laboratory for analysis. This report describes the work <br /> performed and summarizes the analytical results obtained by WCC to date. <br /> 4.0 FIELD ACTIVITIES <br /> f <br /> n WCC drilled four soil borings (S-1 through S-4) and installed lonitoring <br /> wells in the boreholes between August orin8s we$e2 , 197.advancedrus9ngoaatruc!c- <br /> are shown on the attached Figure 1. B g <br /> mountLd Mobile 8-51 drill equipped with 10-inch O.D. hallow-stem augers to <br /> + 'R.s of 51..5 to 52.i1 s'eet below ground surface. Soils penetrated <br /> maximum dept <br /> '•" <br /> by drilling consisted primarily of clayey silt and silty clay, with lesser <br /> + <br /> �., <br /> amounts of silt, sandy silt, sand tend clayey sand. uTeodu3dwToxiTatelyrtwoat <br /> ' { depths between 42 and 43 feet below grade when meas Pp <br /> weeks after installation of the monitoring wells. <br /> Soil Samolinq Prace___dares <br /> e� <br /> -foot depth interals during deilling. The <br /> Sail Samples were collected at 5 <br /> samples and auger cuttings were logged and visually <br /> yclsfied according to <br /> tem by a WCC geologist. <br /> Id s Of the <br /> the Unified Soil Classification Sys <br /> s <br />