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• 09 May 2002 <br /> AGE-NC Project No 96-0232 <br /> Page 3 of 18 <br /> 3.0 GROUND WATER PUMP AND TREAT REMEDIATION SYSTEM <br /> Between 01 January and 31 March 2002, a ground water pump-and-treat system was in continuous <br /> operation at the site,ground water pump-and-treat operation and maintenance procedures for the site <br /> were outlined in AGE's Final Remediation Plan <br /> 3 1 GROUND WATER PUMP AND TREAT OPERATION <br /> The ground water pump-and-treat system was designed to operate at a maximum flow rate of <br /> 25 gallons per minute (GPM) On-site extraction wells EW-4, EW-5, EW-9 and EW-10 were <br /> adjusted at each well-head to continuously extract ground water during the first quarter 2002 at a <br /> flow rate of approximately 5 to 6 GPM, the extracted ground water was routed through a ground <br /> water treatment system consisting of granular activated carbon (GAC) and Sunsolve® Following <br /> treatment, water was discharged to the Coldam ditch (located approximately 450 feet south of the <br /> site) at a flow rate of approximately 24 GPM Field notes of ground water pump and treat operation <br /> and maintenance activities are in Appendix B <br /> Based on effluent flow meter readings (Appendix B, Table 8), approximately 3,054,581 gallons of <br /> treated water were extracted and discharged to the Coldam ditch during the first quarter 2002 under <br /> RWQCB General Order 5-00-119 for discharge to surface waters of ground water from cleanup of <br /> petroleum fuel pollution Since initiation of the groundwater pump and treat remediation system on <br /> 20 November 2000, a total volume of approximately 12,897,113 gallons of MTBE-impacted water <br /> has been treated and discharged to the Coldam ditch An RWQCB waste water discharge permit <br /> [National Pollutant Discharge Elimination System(NPDES)permit no CAG915001] for discharge <br /> to the Coldam ditch was issued to Flag City Chevron by the RWQCB by letter dated 06 November <br /> 2000 <br /> 3 2 GROUND WATER PUMP AND TREAT SAMPLING PROCEDURES <br /> Samples of ground water pump-and-treat influent and effluent water were collected from valved <br /> sampling ports located upstream (influent) and downstream (effluent) of the treatment unit In <br /> addition,water samples were collected from receiving water sampling stations located in the Coldam <br /> ditch approximately 50 feet upstream(R-1)and 80 feet downstream(R-2)of the point of discharge, <br /> R-1 and R-2 locations were approved by the RWQCB during a site inspection on 22 November <br /> 2000 <br /> Grab water samples were collected from influent, effluent and receiving water locations utilizing <br /> 1-liter amber bottles and 1-gallon plastic dugs without a sample preservative and 40-m1 EPA- <br /> Advanced GeoEnvironmental,Inc <br />