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07 June 2002 <br /> AGE-NC Project No 97-0333 <br /> Page 2 of 9 <br /> ' 2.0 INTERIM GROUND WATER PUMP AND TREAT REMEDIATION SYSTEM <br /> Between 21 January 2002 and 01 Apnl 2002, an interim ground water pump-and-treat system was <br /> ' in continuous operation at the site, interim ground water pump-and-treat operation and maintenance <br /> procedures for the site were outlined in AGE's Interim Remediation Work Plan -June 2001, dated <br /> 21 June 2001 <br /> 2 1 GROUND WATER PUMP-AND-TREAT OPERATION <br /> ' On-site extraction well EW-1 was adjusted at the well-head to continuously extract ground water <br /> during the first quarter 2002 at a flow rate of approximately 5 to 6 GPM,the extracted ground water <br /> was routed through a ground water treatment system consisting of granular activated carbon(GAC) <br /> and Sunsolve® Following treatment,water was discharged underground via 2-inch diameter PVC <br /> piping to the City of Manteca sewer system, discharge piping is connected to a sewer manhole <br /> located approximately 25 feet south of the pump-and-treat system <br /> • Based on effluent flow meter readings (Table 1), approximately 291,902 gallons of treated water <br /> were extracted and discharged to the City of Manteca sewer system during the first quarter 2002 <br /> under City of Manteca Public Works Department (CMPWD) Industrial Wastewater Discharge <br /> Permit No 02-1 <br /> ' 2 2 GROUND WATER PUMP-AND-TREAT SAMPLING PROCEDURES <br /> Ground water pump-and-treat influent and effluent water samples were collected from valved ports <br /> located upstream(influent)and downstream (effluent)of the treatment unit The grab water samples <br /> were collected utilizing 1-liter amber bottles and 40-m1 EPA-approved VOA vials containing 0 5 ml <br /> 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Ground water sample containers were labeled <br /> with a sample designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER PUMP-AND-TREAT SAMPLES <br /> Influent and effluent grab water samples were logged on a chain-of-custody form,placed in a chilled <br /> container and transported to McCampbell Analytical Inc , a California Department of Health <br /> Services (DHS)-certified laboratory, for analysis for <br /> Advanced Geo Environmental,Inc <br /> I <br />