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' 01 December 2004 <br /> . AGE-NC Project No 97-0333 <br /> ' Page 2 of 11 <br /> ' 2 1 GROUND WATER EXTRACTION-TREATMENT OPERATION <br /> During the second 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 second 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 <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- <br /> and-treat system <br /> Based on effluent flow meter readings (Table 5), approximately 304,196 gallons of treated water <br /> ' were continuously extracted and discharged to the City of Manteca sewer system between 10 March <br /> 2004 to 23 June 2004 under City of Manteca Public Works Department (CMPWD) Industrial <br /> Wastewater Discharge Permit No 02-1 <br /> 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 third treatment <br /> media vessel(intermediate,GAC-3)and downstream(effluent)of the treatment unit The grab water <br /> samples were collected utilizing 40-m1 EPA-approved volatile organic analysis (VOA) vials <br /> containing 0 5 ml 18%hydrochloric acid as a sample preservative and 1-liter amber bottles Care was <br /> taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground <br /> water sample containers were labeled with a sample designation, date,time,and sampler's initials <br /> 23 LABORATORY ANALYSIS OF GROUNDWATER EXTRACTION AND TREATMENT <br /> Influent, intermediate(GAC-3) and effluent grab water samples were logged on a chain of custody <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, diesel and oil (TPH-g, TPH-d, and <br /> ' TPH-mo, respectively)by EPA Methods 35501503018015 Modified, <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX), methanol, ethanol, tetrachloroethene <br /> (PCE), trichloroethene (TCE), 1,2-dichloroethane (1,2-DCA), ethylene dibromide (EDB), <br /> tertiary butanol (TBA), di-isopropyl ether(DIPE), ethyl tert butyl ether(ETBE), tert amyl <br /> . T methyl ether-(TAME) and methyl tert butyl ether(MTBE)by EPA Method 8260B, and- - - - �—-- <br /> Advanced GcoEnvironmental,Inc <br />