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15 April 2004 • AGE-NC Project No 99-0559 Page 8 of 13 3 2 4 On-Site Discharge Line Connection A dedicated, 2-inch diameter ABS discharge pipeline was constructed from the treatment system to a sewer clean-out located at the eastern edge of the site Waste water is discharged to the City of Stockton sewer system under permit The discharge piping system layout is depicted in Figure 3 f 3 3 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), therefore each of the four recovery wells was adjusted to extract 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 500-gallon 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 Field notes of ground water pump and treat operation and maintenance activities are provided in Appendix B 3 3 1 Ground Water Treatment Start-Up Period Between 15 May and 16 June 2003, AGE initiated a ground water treatment start-up period to test the efficiency of the ground water pump and treat system and to verify treatment of petroleum- impacted water During this time, approximately 8,250 gallons of ground water was extracted from the recovery wells and processed through the on-site treatment system A set of grab ground water samples were collected on 15 May 2003 from the influent and effluent sampling ports ofthe treatment system Influent samples were collected in laboratory-supplied 40-m1 EPA-approved volatile organic analysis (VOA)vials containing 0 5 ml 18%hydrochloric acid as a preservative, care was taken to ensure that visible air bubbles were not present in the vials after filling and capping The effluent sample was collected in the VOA vials and a 1-liter amber bottle without preservative The water-sample containers were labeled with the sample designation, date, time, and sampler's initials, afterwards, the containers were logged on a chain-of-custody form, placed in a chilled container and transported to McCampbell Analytical Inc (MAI), a California Advanced GeoEnvironinental,Inc