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Site Background Information Waterloo Food & Fuel AGE-NC Project No 99-0559 Page 4 of 11 perforated well casing to a depth of 80 feet bsg INSTALLATION OF GROUND WATER EXTRACTION SYSTEM The ground water extraction system consisting of the ground water treatment unit and associated piping was installed between 18 February and 26 June 2003 GROUND WATER TREATMENT OPERATION The ground water treatment system is designed to operate at a maximum flow rate of up to 10 gallons per minute (GPM), each of the four recovery wells extracts ground water at a flow rate of approximately 2 to 2 5 GPM,by extracting on an intermitting cycle The operation of the pumps allowed for a hiatus when water fall below the pump inlet to allow the well to recharge, after which the pump will reactivate The ground water treatment system operates on a batch basis,with a daily total of up to 4,000 gallons Once the sediment holding tank fills, approximately 250 gallons of extracted ground water is treated and discharged The discharge of treated water(effluent)to the City of Stockton was adjusted at a flow rate of approximately 10 GPM ON-SITE CPT LITHOLOGIC INVESTIGATION APRIL 2001 Three soil borings (CPT-1, CPT-2 and CPT-3)were advanced on-site utilizing CPT technology to model the geological and hydrogeological framework and to assess the vertical extent of dissolved petroleum-hydrocarbons beneath the site Lithologic data was collected from an initial CPT soil boring in each locality,a twin boring was then advanced immediately adjacent to the initial CPT soil boring to collect soil and grab ground water samples from selected depths Soil borings CPT-1, CPT-2 and CPT-3 were advanced vertically to maximum depths of approximately 155 feet below surface grade(bsg), 162 feet bsg and 158 feet bsg,respectively CPT1 was advanced at the western edge of the site,in the down-gradient direction from the UST area,CPT2 was advanced adjacent to the UST release, within the core area of the hydrocarbon-impacted vadose soil, and CPT3 was advanced along the southern edge of the site,at the furthest southern point on the site from the UST release,in a cross-gradient location A site plan depicting boring locations is presented in Figure 2 Ground water samples were collected from the CPT borings at the following intervals • CPT-1 was sampled at 60 feet W2), 100 feet(HU4), 130 feet bsg(HU5U)and 150 feet bsg (HU5L), • CPT-2 was sampled at 100 feet (HU4), 130 feet W5U) and 150 feet bsg(HU5L) and Advanced GeoEnvironmentai,Inc.