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,• 09 May 2003 AGE-NC Project No 96-0232 ' Page 2 of 16 ' 2.0 GROUND WATER PUMP AND TREAT REMEDIATION SYSTEM Between 05 December 2002 and 25 March 2003(first quarter 2003),a ground water pump-and-treat ' remediation system was in continuous operation at the site Ground water pump-and-treat operation and maintenance procedures for the site were outlined in AGE'S Final Remediation Plan, dated 31 August 2000 2 1 GROUND WATER PUMP AND TREAT OPERATION ' The Flag City Chevron ground water pump-and-treat system was designed to operate at a maximum ' flow rate of 25 gallons per minute(GPM) On-site extraction wells EW-4,EW-5, EW-8,EW-9 and EW-10 were adjusted at each well-head to continuously extract ground water during the first quarter at a flow rate of approximately 5 to 6 GPM, due to a pump malfunction at well EW-5,the pumping ' rate at extraction well EW-8 was increased on 27 January 2003 as substitute pumping for well EW-5 During the first quarter 2003, all extracted ground water was routed through a ground water Iletreatment system consisting of granular activated carbon (GAC) and Sunsolveg Following treatment,water was discharged to a conveyance ditch(located approximately 450 feet south of the site) at a flow rate of approximately 24-25 GPM Field notes of ground water pump and treat Ioperation and maintenance activities are in Appendix A Based on effluent flow meter readings(Appendix A, Table 8), approximately 2,871,250 gallons of Flag City Chevron treated ground water were discharged to the above referenced conveyance ditch during the first quarter 2003 under RWQCB General Order 5-00-119 for discharge to surface waters of groundwater from cleanup ofpetroleum fuel pollution Since initiation of the groundwater pump- and-treat remediation system on 20 November 2000, a total volume of approximately 19,499,136 gallons of MTBE-impacted water has been treated and discharged to the conveyance ditch under RWQCB waste water discharge permit no CAG915001 [National Pollutant Discharge Elimination System (NPDES)j I2 2 GROUND WATER PUMP AND TREAT SAMPLING PROCEDURES In accordance with RWQCB Monitoring and Reporting Program No 5-00-119,monthly sampling of influent and effluent waters from the pump-and-treat system and receiving water was required for analysis for petroleum constituents of concern In addition,a water sample from the effluent stream of the pump-and-treat system was required quarterly for bioassay On 27 January, 24 February and 25 March 200 i �Y, ary 3, samples of ground water were collected from valved sampling ports located pre-treatment(influent)and post-treatment(effluent)of the pump-and- Advanced GeoEnviroamental,Inc