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,q q • 15 June 2004 AGE-NC Project No 95-0142 Page 6 of 12 2 2 5 On-Site Discharge Line Connection A dedicated,2-Inch diameter PVC discharge pipeline was constructed from the treatment system to a sewer drain 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 III Figure 3 2 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), the primary extraction well (EW-1) extracts ground water at a flow rate of approximately 4 to 5 GPM using continual operation If water falls below the pump Inlet,the pumps are operated on "hiatus" which allows an interval during which the well will recharge and the pump will reactivate The hiatus allows for water level recharge within the wells The ground water treatment system operates on a batch basis, with a dally total of up to 3,000 gallons Once the 300-gallon holding tank fills,approximately 150 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 C 2 3 1 Ground Water Treatment Start-Up Period On 11 February 2004, 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 18,500 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 11 February 2004 from the influent and effluent 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 visible air bubbles were not present in the vials after filling and capping Water sample containers were labeled with the sample designation, date, time, and sampler's initials • Advanced GeoEnviron mental,Inc