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' f <br /> 1 � <br /> 1 01 October 2004 <br /> AGE-NC Project No 97-0333 <br /> ' Page 2 of 11, - <br /> 2 1 GROUND WATER EXTRACTION-TREATMENT OPERATION <br /> During the first quarter 2004, 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 /> During the first quarter, all extracted ground water was routed through four 2,000 pound media <br /> ' vessels containing liquid phase granular activated carbon (GAC), Following treatment, water was i <br /> discharged underground via 2-inch diameter PVC piping to the City of Manteca sewer system, <br /> discharge piping is connected to a sewer manhole located approximately 25 feet south of the pump- i <br /> and-treat system <br /> Based on effluent flow meter readings (Table 5), approximately 280,576 gallons of treated water { <br /> were continuously extracted and discharged to the City of Manteca sewer system between n, <br /> 26 December 2003 to 10 March 2004 under City of Manteca Public Works Department(CMPWD) <br /> Industrial Wastewater Discharge Permit No 02-1 <br /> 10 2 2 GROUND WATER EXTRACTION-TREATMENT SAMPLING PROCEDURES <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 <br /> treatment media vessel(intermediate, GAC-2)and downstream(effluent)of the treatment unit The <br /> grab water samples were collected utilizing 40-m1 EPA-approved volatile organic analysis (VOA) <br /> vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and 1-liter amber bottics <br /> Care was taken to ensure that visible air bubbles were not present in the vials after filling and <br /> capping Ground water sample containers were labeled with a sample designation, date, time, and <br /> sampler's initials <br /> ' 23 LABORATORY ANALYSIS OF GROUNDWATER EXTRACTION AND TREATMENT <br /> Influent, intermediate(GAC-2) and effluent grab water samples were logged on a chain-of-custody i <br /> ' form, placed in a chilled container and transported to a California Department of Health Services ,' <br /> (DHS)-certified laboratory to be analyzed for <br /> ' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Methods 355015030/8015 Modified, <br /> , S <br /> ' • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl-tertiarybutyl ether(MTBE) <br /> by EPA Method 8020, and <br /> ' Advanced GeoEnvironmental,Inc <br />