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l ' ll t ' f ,i i, F ' IS 05 January 2004 ` AGE-NC Project No 97-0333 Page,2 of 11 1 C 21 GROUND WATER EXTRACTION-TREATMENT OPERATION During the third quarter 2004, extraction well EW-1 was adjusted at the well-head to continuously extract ground water at a flow rate of approximately 4 GPM During the third quarter, all extracted ground water was routed through four 2,000 pound media i vessels containing liquid phase granular activated carbon (GAC) Following treatment, water was I discharged underground via 2-inch diameter PVC piping to the City of Manteca sewer system, discharge piping is connected to a sewer manhole located approximately 25 feet south of the pump- and-treat system a 11 Based on effluent flow meter readings(Table 1),approximately 93,812 gallons of treated water were continuously extracted and discharged to the City of Manteca sewer system between 23 June 2004 ' to 15 September 2004 under City of Manteca Public Works Department (CMPWD) Industrial Wastewater Discharge Permit No 02-1 e1 1 2 2 GROUND WATER EXTRACTION-TREATMENT SAMPLING PROCEDURES Ground water extraction and treatment influent, intermediate and effluent water samples were collected on a monthly basis from valved ports located upstream(influent),after the third treatment media vessel(intermediate,GAC-3)and downstream(effluent)of the treatment unit The grab water ' samples were collected utilizing 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and 1-liter amber bottles Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground , water sample containers were labeled with a sample designation, date, time, and sampler's initials 23 LABORATORY ANALYSIS OF GROUND WATER EXTRACTION AND TREATMENT Influent, intermediate (GAC-3)and effluent grab water samples were logged on a chain of custody form, placed in a chilled container and transported to a California Department of Health Services } Il (DHS)-certified laboratory to be analyzed for 1 ; J hydrocarbons quantified as gasoline, diesel and oil (TPH-g, TPH-d, and • Total petroleum y q g 1 TPH-mo, respectively) by EPA Methods 35501503018015 Modified, • Benzene, toluene, ethylbenzene and xylene (BTEX), methanol, ethanol, tetrachloroethene Ii (PCE), trichloroethene (TCE), 1,2-dichloroethane (1,2-DCA), ethylene dibromide (EDB), } tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl y ti methyl ether(TAME) and methyl tert butyl ether(MTBE) by EPA Method 8260B, and Advanced GeoEnviron mental,Inc i