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F i f:�projccys�5130'�tyimcep i-� 4 1.3 Background Figure 1 shows the locations and analytical results of five soil samples taken from beneath a a 2,000 gallon gasoline tank, 10,000 gallon diesel tank tank,and the associated piping when the tanks were removed in January 1989 by Jim Thorpe Oil. The samples contained Total Petroleum Hydrocarbons as gasoline(TPHG)at concentrations ranging from nondetectable (ND<1) to 2,200 Farts per million (ppm) and Total Petroleum Hydrocarbonsas diesel (TPHD)ranging from nondetectable(<10)to 5,500 ppm. Benzene,'roluene,Ethylbenzene, and Xylenes (BTEX) were found at concentrations ranging from nondetectable (<0.025- r„ 25) to 300 ppnL One of the three soi. samples analyzed for total lead contained 9 ppm (detection limit 5 ppm). Three samples analyzed for ethylene dibromide contaired. nondetectable (<0.25-25 ppm) concentrations. The former tank excavation remained open from January 1989 until November 1990 when ESE was retained by Delta Truck to perform this additional investigation. The stockpiled soil from the January 1989 excavation remains on site. Based on soil sample analytical results from the January 1989 investigation,significant levels ` of hydrocarbons appear to be limited to the areas beneath the product lines and the west end of the former diesel tank(samples 5 and 2,respectively). Lead and ethylene dibromide were not found above regulatory action levels. t } Overexcavation was proposed by ESE to deepen and enlarge the excavation around the product lines and the west end of the diesel tank to remove the soil containing hydrocarbons. Drilling and sampling one or more soil borings within the building and c' sampling the excavation itself was proposed by ESE to assess the lateral and vertical extent of hydrocarbons in the soil surrounding the excavation and beneath the building. 2