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- t Y <br /> F a <br /> analytical results detected andhb <br /> Soil and ground water enzene, <br /> presence of total pet, andmxylenesarbons(BTEX) .TPH)H) <br /> toluene, ethylbenzeneY <br /> On November 21, 1988, six exploratory borings were drilled to <br /> depths ranging from 12 to 13 feet below grade aofthe <br /> asite. <br /> Analyses of soil samples collected from depths <br /> 10 feet showed detectable concentraer i (s 0 and TPHdassel <br /> (TPH-D) UP to 2,900 parts p <br /> PH-G) up to 360 ppm• Ground water was encountered <br /> gasoline (T <br /> between 11 and 12 feet below grade. <br /> In February 1989, additional soil thsPofs5wand 10 feet <br /> re ebelow <br /> the site from 12 test hOAnald at <br /> aseaeof soil samples detected <br /> grade using a backhoe. Y to 3,600 ppm and TPH-G up to <br /> concentrations of TPH-D of up ative _ <br /> 170 ppm. Rediesel-range contamination in theesubsurface soi?. <br /> presence of rade and encompassing <br /> extending to a depth of 10 feet below g Soil analytical <br /> an area of approximately 3,700 ::ubic feet. e hydrocarbon <br /> data from test holes suggests that Gasoline-raion ot the site. <br /> ng Y <br /> contamination is limited to the northern port <br /> Mobil Oil Corporation contracted Alton GeosCience in February <br /> 1990 to charatentize the offsite disposalnt of aroThebresultstof thiel <br /> onsite <br /> for were to be used during soil excavation to <br /> soil profiling sal at an appropriate offs'te <br /> segregate the soil for dispo <br /> yards of soil was <br /> facilities. Based onre�fmate11t6,100tcubichis nysitu axil <br /> Y <br /> characterizatioPdisposed of at either the Class II <br /> excavated and properly Inc. or at the Class III <br /> facility of Liquid Waste Management, <br /> Durham Road Landfill. <br /> potential impact of hydrocarbon constituents on <br /> To assess the p nce in 1990. <br /> the ground water beneath the wells onsoite�onsSeptem installed <br /> four .ground water monitoring. <br /> The findings and conand sfrom the ions mresults this anofplaborat°round <br /> investigative work, <br /> analyses and field observations report <br /> water. investigation are p g encies. In <br /> submitted to the appropriate regulatory agencies. <br /> site <br /> May 199I, Alton Geoscience conducted a supe <br /> investigation by drilling additional S( yandoanalyzing soil <br /> installing monitoring wells; <br /> and ground water samples. Pertinent findings of the study <br /> are summarized below: <br /> • <br /> tions at the site and <br /> Based on hydrogeologic condi -laboratory - <br /> results of the field activities and <br /> hasehydrocarbon <br /> analyses, the extent f dissolvedcan be estimated <br /> constituents in the ground <br /> onsite and downgradient of the site- <br /> 2 <br />