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MAMOM <br /> n <br /> E; 7-BIeven/Stockton 2 0 <br /> October 19$$ <br /> vicinity of the former pump island and extending north toward MW- <br /> 11- The TPH-as-gasoline plume decreased in area]. extent <br /> throughout May, June, and July 1988, however, in August and <br /> September 1988, the extent of the plume increased as TPH-as- <br /> gasoline levels increased in MW-11, the easternmost well. <br /> REHEDIATION SYSTEMS <br /> The remediation systems currently operating at the site <br /> consistent of a groundwater-extraction system and soil-vent <br /> system. The groundwater-extraction system consists of pumping <br /> wells designed to remove free product and treat the dissolved <br /> constituents in the groundwater by air stripping. The soil-vent <br /> system was installed to control hydrocarbon vapors and aid in <br /> reducing the adsorbed contamination in the subsurface soils near <br /> the tank pit. <br /> GROUNDWATER REHEDIA'TIOH SYSTEM <br /> r <br /> i <br /> Groundwater is currently being extracted from pumping well 1 <br /> (PW-1) and recovery well 1 (RW-1) , Figure 2. PW-1 is pumping at <br /> a rate of approximately 0.5 gallons per minute (gpm) , however, <br /> the well is incapable of sustaining this rate continuously and <br /> the pump cycles. The pump in RW-1 is pumping at approximately 3 <br /> gpm continuously. The areas these wells are influencing are <br /> illustrated on the groundwater gradient maps <br /> (Figures 3, 4, 5, 6, <br /> .. 7, and 8) . No free product is present in the pumping wells, <br /> however, the water table depression pumps are operating to reduce <br /> the dissolved groundwater contamination. <br /> w1 1 <br /> �I CHOCNirit'ATEk <br /> TecttNnt.ot;t',INc. <br /> w <br />