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1I' <br /> � 26 April 2004' I � <br /> AGE-NC Project No 97-0333 <br /> I <br /> I r , <br /> Page 2 of 12, r <br /> w <br /> • <br /> 17, 18 and 19 November 2003 -AGE performed a quarterly ground water monitoring event <br /> (fourth quarter 2003) at wells MW-1 through MW-13 j <br /> 2.0 GROUND WATER EXTRACTION-TREATMENT REMEDIATION SYSTEM <br /> Between 10 September 2003 and 26 December 2003(fourth quarter 2003),aground water extraction <br /> ' and treatment system was'in operation at the site as ground water interim remediation However, <br /> ground water extraction and treatment operations were temporarily suspended between 18 September <br /> 2003 and 20 October 2003 due to detection of TBA at the pump-and treat effluent Ground water <br /> extraction and treatment operations were restarted on 20 October 2003 following a change-out of I <br /> carbon media from the T'J and 4"' In-line media vessels The ground water treatment operation and <br /> maintenance procedures for the site were outlined in AGE's Interim Remediation Work Plan-June <br /> '2001, dated 21`June 2001 <br /> h I <br /> r <br /> V 4 <br /> I <br /> ' !2 1 GROUND WATER EXTRACTION-TREATMENT OPERATION <br /> During the fourth quarter 2003,extraction well EW-1 was adjusted at the well-head to continuously <br /> extract ground water at a flow rate of approximately 4 GPM <br /> 1_J Pnor to 18 September 2003,all extracted ground water was routed through a ground water treatment <br /> system consisting of coconut shell, liquid'phase granular activated carbon (GAC) and Sunsolve®, <br /> l� after 20 October 2003, all extracted ground water was routed through four 2,000 pound media <br /> l vessels containing only liquid phase GAC Following treatment,water was discharged underground <br /> via 2-inch diameter PVC piping to the CAy of Manteca sewer system, discharge piping Is connected <br /> ;: to a sewer manhole located approximately 25 feet south of the pump-and-treat system <br /> I I <br /> L <br /> Based on effluent flow meter readings (Table 5), approximately 205,130 gallons of treated water <br /> I� were continuously extracted and discharged to the City of Manteca sewer system between 10 <br /> September to 18 September 2003 and between 20 October to 26 December 2003 under City of <br /> Manteca Public,Works Department(CMPWD) Industrial Wastewater Discharge Permit No 02-1 <br /> I <br /> 2 2 GROUND WATER EXTRACTION-TREATMENT SAMPLING PROCEDURES y <br /> [Ground water'extraction and treatment influent, intermediate and effluent water samples were <br /> collected on' a monthly basis from valved ports�located upstream (influent), after the second I <br /> .I treatment media vessel(intermediate, GAC-2)and downstream(effluent) of the treatment unit The <br /> grab water samples were lcollected utilizing 40-m1 EPA-approved volatile organic analysis (VOA) <br /> Advancedr lGcoEnvtIronmental,Inc' r <br /> I <br /> i { b <br /> I 9 <br />