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Site Assessment fop Nunan n 09/08197 Rose 7 of 9 0.2 0,�(MQrr Out, MEOA nay zal El,�O-'Ucags, OU'Gm ',G Isad., Gina 0"am(Danns 1 The following tables listing the results of analyses performed which did identify contaminants in significant quantities are shown in map view and cross section in Figures 2 through Y. Benzene was identified at its highest level at 6.7 PPM at a depth of 21.5 feet 9 P bgs below the base of the former UST pit. Some meteoric water was ' identified at this depth because the former pit was filled with pea gravel and there is no asphalt cover to prevent the infiltration of stormwater runoff. ' Benzene does not appear to be in soil outside the vicinity of the former gasoline UST pit. Even though TPHg was identified in the vicinity of the former waste oil UST, no benzene was identified. Figures 5, 6, and 7 verify ' that benzene in soil is within the shadow of the TPHg plume. 6.0 ME ' The following table shows physical soil characteristics of soil encountered. ' TABLE TOWN AND COUNTRY CHEVRON / NUNAN 13336 HIGHWAY 88, LOCKEFORD, CA Physical Characteristics of Soil Encountered in Boreholes SCC samples CONGead ¢ro¢m Fw meP Gmsoflne & Mms�e 05E USU [M 4%:rams ' BORING DEPTH Moisture Bulk Porosity Fraction of NUMBER (FEET) Content Density Organic % glcc Carbon Content B1 S 29 5-30 0 14 20 90 12 B5 115-120 15 22 0 068 B6'3 125-130 12 1 21 50 14 The samples were collected from locations and depth intervals which were considered to be as diverse and representative as possible. These results ' indicate that the soil is relatively homogeneous. The average bulk dry density is 2.1 g/cc and the average bulk da density is 1.85 g/cc (115.5 lbs/cubic ft). The average bulk dry density of 115.5 lbs/cubic ft and 13.7 % ' moisture content indicate that the site is predominantly sandy silts and clays with a typical organic carbon content.