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' Site Background Information Chapin Brothers Investements, Inc Page 10 of 12 i INSTALLATION OF GROUND WATER EXTRACTION SYSTEM The ground water extraction system consisting of the ground water treatment unit and associated piping was installed between January and March 2002 ' A 1-inch diameter, schedule 40 PVC process piping and 3/4-inch diameter, schedule SO PVC electrical piping conduit were installed in the on-site trench at approximately 18-inches bsg A ' manifold PVC piping system was utilized in the trench to connect the process piping system from each extraction well head to the ground water treatment system 4-inch diameter, stainless steel model 5S 10 Grundfos Rediflow down-well pumps equipped with 230 volt Franklin V2-horsepower i 3-wire motors were installed in ground water extraction wells EW-1, EW-2, EW-3, VW-6 The Grundfos pumps were installed in each well at a depth of approximately 30 feet bsg Electrical PumpTec controller boxes were installed in the electrical control panel for individual control ' measures of extraction well pumps Pump controls are supplied by an amperage sensing/time control switch This switch will detect any decrease in amperage when water level drops below the impeller intake from any of the Grundfos pumps ' Three 2,000-gallon media vessels, one 1,000-gallon poly holding tank, one process pump and one sediment filter chamber were installed for the groundwater treatment system Ground water pumped from the recovery wells is initially routed via the piping system to the 1,000-gallon holding tank prior to processing The process pump is designed to process ground water through the treatment system at a maximum flow rate of 20 gallons per minute (GPM) The ground water was routed to the three 2,000 pound vessels containing granular activated carbon(GAC) The GAC media vessels are designed to adsorb TPH-g and BTEX compounds Brass sampling ports were installed at the ' influent, between the media vessels and at the effluent to allow detection of potential media break through and to obtain final discharge samples A F-2000 model RT Blue-White Industries flow meter was installed on the effluent line to continuously measure and display the effluent flow rate and to continuously measure and display the total flow iGROUND WATER TREATMENT OPERATION AND MONITORING The ground water treatment system is designed to operate at a maximum flow rate of up to ' 15 gallons per minute (GPM), therefore each of the three recovery wells was adjusted to extract ground water at a flow rate of approximately 5 to 6 GPM by extracting on an intermitting cycle The operation of the pumps allow for up to a four minute hiatus interval, after which the pump will reactivate This hiatus mainly allow for water level recharge within the wells The ground water treatment system operates on a batch basis, with a daily total of 14,400 gallons Once the 2,000- gallon holding tank fills, approximately 1,750 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 15 GPM ' Advanced GeoEnvironmental,inc