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..,: LL. ''e'er' <br /> 1 � <br /> W <br /> In May 1989, hydrocarbon impacted soil was detected behind the resort buildings during a <br /> z geotechnical investigation by Kleinfelder, Inc, In May of 1989, following the geotechnical <br /> t investigation, Thorne Environmental, Inc. drilled two shallow borings and collected grab soil <br /> and groundwater samples. The samples were analyzed for benzene, toluene,ethylbenzene, and <br /> total xylenes (BTEX) using EPA method 602 and total petroleum hydrocarbons (TPH) by <br /> modified EPA method 8015. Laboratory analyses determined that the two soil samples <br /> contained TPH concentrations of 450 and 1900 mg/kg and two water samples contained 2600 <br /> and 2700 pg/1 benzene and 36 and 140 mg/1 TPH. <br /> In April 1990, ENSR performed a soil vapor survey to assess the potential presence of <br /> hydrocarbons at the site. Soil vapor samples were obtained from 29 locations at an approximate <br /> depth of 18 to 22 inches below grade using a hollow stainless steel probe. In addition,a grab <br /> soil and groundwater sample was collected from a hole dug approximately 2 feet below grade, <br /> !i at the approximate location where Kleinfelder had previously detected hydrocarbons. The soil <br /> I sample was analyzed for TPH modified for gasoline (TPHG). The groundwater sample was <br /> 5 <br /> analyzed for BTEX using EPA method 8020. The analysis indicated the soil sample levels of <br /> ' TPHG were below quantifiable limits, and the water sample contained 180 jag/l benzene. The <br /> 1 J results of this investigation are summarized in ENSR's Soil Vapor Investigation, King Island <br /> Resort, 11530 Eight Mile Road, Stockton, California,ENSR Document No.555a-107-000,April <br /> 1990. <br /> On October 1, 1990,RESNA Industrics%WaterWork Corp.hand augered 19 shallow soil borings <br /> to help determine the extent of petroleum hydrocarbons in soil at the site. Soil samples were <br /> collected at approximately 4 feet below grade and screened for possible volatile organic vapors <br /> using a photolonization detector (PID). The approximate location of each hand augered boring <br /> is shown on Figure 3. Photoionization detector readings(calibrated to isobutylene)ranged from <br /> 0 to 1032 parts per million. The approximate zone of soil contamination, according to <br /> information gathered from the hand augered borings, is plotted on Figure 4. <br /> King bl"Rman-307 2 <br /> R061691.wp <br /> j <br /> j <br />