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IM ��­ <br /> LIZ M <br /> 'M <br /> 2.2 Project Hist <br /> on July 20, 1990, SemcO removed one 21000 gallon underground <br /> 7, gasoline storage tank and one 1,000 gallon underground waste oil <br /> ik from the above described property- Soil samples were <br /> tar of both tanks- The <br /> collected beneath the east and west ends <br /> beneath the gasoline tank were analyzed for total <br /> samples f rom as gasoline (TPH) and for benzene, toluene, <br /> petroleum hydrocarbons yienes (BTEX) . TPH was detected at 260 <br /> ethylbenzene and total x <br /> beneath the east end and 12 ppm beneath the <br /> parts per million (PPM) at 0.2 ppm beneath the east end and <br /> west end. Benzene was detected . tions of gasoline and <br /> at 0.1 ppm beneath the west end. Concentra <br /> benzene were in excess of state and county guidelines. <br /> that were collected from beneath the �waste oil <br /> The soil samples <br /> tank were analyzed for TPH as gasoline, diesel, kerosene, an mo or <br /> oil, for BTEX, for total lead, for the CAM 17 metalse for volatile <br /> PCB's. TpH as motor oil was <br /> -ganic halogens (voH) , and for <br /> 01. at 3,600 ppm beneath the west end of the tank, BTEX <br /> detected tions below the west <br /> constituents were detected at low concentra <br /> end, lead was not detected, and the CAM 17 metals were detected at <br /> a ions below the Total Threshold Limit Concentrations <br /> (TTLC Of the volatile organic halogens, pcE was detected at 0.16 <br /> of the tank. No pcB's were detected. <br /> X��ppmbeneath the west end r oil and pcE, additional site <br /> Given the concentrations of motO <br /> _7571C characterization was warranted. <br /> nces, Inc. to <br /> qua Geoscie <br /> Zamora/Wondries Group, contracted with A <br /> prepare a workplan, implement this site characterization study, and <br /> prepare this report of findings. <br /> nent Acti <br /> 3.0 Asse ism-. T- P.9tiYiti9S_ <br /> ies for this phase included advancing six borings on <br /> Field Activit the lateral and vertical extent <br /> April 2 and April 3, 1991 to assess <br /> of soil impaction. Soil boring TH-2 was advanced through the east <br /> ormer location of the gasoline tank to a depth of 20 <br /> end of the f tical limits of impacted soil. Borings TH-1, <br /> f eet to assess the ver <br /> assesspent of the lateral extent <br /> and TH-3, were drilled to enable t tank area. Boring TH-4 was <br /> of impacted soil in the produc <br /> a depth of 25 feet, through the west end of the former <br /> advanced to <br /> location of the waste oil tank to assess the vertical limit Of soil <br /> impacted by waste-oil and boring TH-5 and TH-6 were advanced to <br /> assess the lateral extent (Exhibit 2). <br /> Boring TH-1 was drilled through the western end of the former <br /> nd TH-3 was drilled approximately seven feet <br /> asoline tank cavity a TH-5 and TH-6 were advanced <br /> 9 <br /> northeast of TH-2. Borings -4 (Exhibit 2) . <br /> approximately five and ten feet from TH <br /> 2 <br />