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• Number ofBorings/Wells One boring (SB-3) was drilled on April 24, 1998 in the vicinity of the <br /> northern dispenser island to delineate the vertical extent of petroleum <br /> hydrocarbons This boring met with drilling refusal at 55 feet below <br /> grade (fbg) Field evidence indicated petroleum hydrocarbons were <br /> present in the soil at 50 fbg and ground water was encountered at <br /> approximately 52 fbg Therefore, three ground water monitoring <br /> wells were drilled and installed on April 29 and 30, 1998 at the <br /> locations shown on Plate 2 Well S-I could not be constructed at the <br /> location of Boring SB-3 because SB-3 was located beneath the <br /> dispenser island canopy A larger drilling rig, which would not fit <br /> under the canopy, had to be used to drill Well S-1 because the smaller <br /> rig, used to drill Boring SB-3, could not drill deep enough for well <br /> installation <br /> Boring Depths Boring SB-3 was drilled to 55 fbg where drilling refusal was <br /> encountered The well borings (S-1, S-2, and S-3) were drilled to 65 <br /> fbg <br /> Ground Water Depths First encountered ground water was observed between 51 5 and 52 fbg <br /> . in the borings drilled during this investigation Static ground water <br /> levels stabilized at approximately 50 fbg <br /> Sediment Lithology L ethology encountered during drilling of the borings consisted of clay <br /> (CL), silt (ML), clayey sand (SC), and silty sand (SM) to the total <br /> depth explored of 65 fbg Clay and silt were the predominant soil <br /> types with lesser amounts of clayey sand and silty sand present in the <br /> subsurface Soil lithology is presented on the boring logs <br /> Soil Chemical Analyses- Soil samples from each boring were submitted for chemical analysis <br /> Samples were analyzed for TPPH by EPA Method 8015 (modified), <br /> BTEX by EPA Method 8020, and fuel oxygenates (ethanol, TBA, <br /> MTBE, DIPS, ETBE, and TAME by EPA Method 8260, and <br /> methanol by EPA Method 8015) <br /> Soil Disposal Approximately 5 cubic yards of soil were generated during field <br /> activities This soil was placed on and covered with visqueen on-site <br /> Soil samples were collected from the stockpile, analyzed, and profiled <br /> for disposal at Forward, Inc 's Manteca, California landfill The soil <br /> was transported by Manley and Sons Trucking, Inc of Sacramento, <br /> SCalifornia to Forward's landfill on May 14, 1998 <br /> 240-0797 3 <br />