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1 <br /> 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 in the area of the excavation. The stockpiled soil was <br /> also sampled to lddistinguish <br /> Thelo locations of the borings <br />' en clean and <br /> petroleum hydrocarbon-containing <br /> and monitoring 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 /> I is to. <br /> • Present the results of a soil and groundwater investigation <br /> performed by ERM-West during November and December 1990, <br /> • Synthes analyticalize data from all environmental investigations <br /> at the site, and <br />' • Assess the occurrence of petroleum hydrocarbons in soil and <br /> groundwater beneath the site. <br /> Results of Previous Investigations <br /> The results of previous investigationsare Presented to convey the <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 /> During January 1990, WHF conducted a site assessment that <br /> included the installation of six 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 /> I` (mg/kg) of diesel and 170 mg(kg of gasoline were detected in the <br /> sample collected from boring 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 in the report entitled "Phase 11 <br /> Environmental Property Assessment", which was submitted by <br /> 1-2 <br />