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In order to assess the extent of petroleum hydrocarbon occurrence at <br /> the site, ERM-West conducted soil and groundwater sampling at the <br /> facility during November and December 1990 Twenty-five borings <br /> were installed an the area of the excavation The stockpiled soil was <br /> also sampled to identify and distinguish between clean and <br /> petroleum hydrocarbon-containing soils The locations of the bonngs <br /> and monitonng wells installed during this investigation are <br /> illustrated in Figure 1-2 <br />' Detailed descriptions of these previous investigations performed by <br /> WHF and ERM-West are presented below The purpose of this report <br />' as to <br /> Present the results of a soil and groundwater investigation <br /> performed by ERM-West during November and December 1990, <br /> • Synthesize analytical data from all environmental investigations <br /> at the site, and <br /> • Assess the occurrence of petroleum hydrocarbons in soil and <br /> groundµater beneath the site <br /> Results of Previous Investigations <br /> The results of previous investigations are resented to convey the <br /> P g P <br /> history of investigations at the site as well as to assist in <br /> characterizing petroleum hydrocarbon occurrence at the site <br /> Reports documenting previous investigations are contained in <br /> Appendices to this report and are referenced below <br /> 1 <br /> ,Ehase II Site Assessnipat, <br /> During January 1990, WHF conducted a site assessment that <br /> included the installation of sax soil borings near five underground <br /> storage tanks located in the northwest corner of the facility See <br /> Figure 3, Appendix A The tanks consisted of two 10,000-gallon <br /> diesel tanks, two 5,000-gallon diesel tanks, and one 10,000-gallon <br />' gasoline tank Soil samples were collected at a depth of 15 feet below <br /> grade, and were analyzed for total petroleum hydrocarbons (TPH) as <br /> diesel and gasoline, and/or benzene, toluene, ethylbenzene and <br /> xylenes (BTEX) Concentrations of 1500 milligrams per kilogram <br /> (mg/kg) of diesel and 170 mg/kg of gasoline were detected an the <br /> sample collected from bonng B1 (see Table 1-1) Results from all <br /> other samples were below the limit of detection The results of this <br /> investigation are described an the report entitled "Phase II <br /> Environmental Property Assessment", which was submitted by <br /> 1-2 <br />