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_ — a <br />_ 1 <br /> 1 <br /> i <br /> r <br /> In May 1989, hydrocarbon impacted soil was detected behind the resort buildings during a <br /> geotechnical investigation by Xleinfelder, Inc. In May of 1989, following the geotechnical <br /> finvestigation, Thorne Environmental, Ir_c. drilled two shallow borings and collected grab soil <br /> and groundwater samples. The samples were analyzed for tvnzene, toluene,ethylbenzene, and <br /> total xylenes (BTEX) using EPA method 602 and total petroleum hydrocarbons (TPH) by 3` <br /> 3 <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 2700µg/l benzene and 36 and 140 mg/l TPH. <br /> 1 <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 hoIe dug approximately 2 feet below grade, ' <br /> at the approximate location where Kleinfelder had previously detected hydrocarbons. The so;l <br /> sample was analyzed for TPH modified for gasoline(TPHG). The groundwater sample was <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.ug/l benzene. The `]r <br /> results of this investigation are summarized in EV- SR's Soil Vapor Investigation, King Island <br /> y Resort, 11530 Eight Mile Road, Stockton, California,ENSR Document No. 5555-107-000,AFriI j! <br /> 1990. <br /> On October 1, 1990,RESNA IndustriesMaterlWork Corp. hand augered 19 shallow soil borings J <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 photoionization 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 angered borings, is plotted on Figure 4. <br /> King W"Report-387 <br /> J Ro91sot.wp <br /> 1 <br />