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12 August 2002 • AGE-NC Project No 95-0103 ' Page 5 of 11 ' The ground water treatment system is enclosed within a chain-link fence on the southwest side of the site, secondary containment consists of an 18-inch high concrete block wall surrounding the treatment system ' 2 2 4 On-Site Discharge Line Connection A dedicated, 1-inch diameter PVC discharge pipeline was constructed from the treatment system to ' a sewer clean-out located directly west of the building on 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 2 3 GROUND WATER TREATMENT OPERATION ' Theound water treatments stem is designed to operate at a maximum flow rate of u to Si" Y � p p ' 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 ' Field notes of ground water pump and treat operation and maintenance activities are provided in Appendix B 2 3 1 Ground Water Treatment Start-Up Period Between 02 April and 24 April 2002,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 15,264 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 24 April 2002 from the influent and ettluent ` sampling ports of the 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 Effluent samples were collected in the (VOA) vials, 1-liter amber bottles without preservative and 500-milliliter plastic bottles without preservative Care was taken to ensure that Advanced GwEnvironmental,Inc 1