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F <br /> r <br /> ' 06 December` 2002 „ <br /> AGE-NC Project No 97-0333 _ <br /> ' Page 2 of 9 , <br /> r <br /> the pump-and-treat carbon media vessels The interim groundwater pump-and-treat system operation <br /> ' and maintenance procedures for the site were outlined in AGE's Interam Remediation Work Plan - <br /> June 2001, dated 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 third quarter 2002 at a flow rate of approximately 4 GPM,the extracted ground water was , <br /> ' routed through a ground water treatment system consisting of granular activated carbon(GAC) and <br /> Sunsolve® Following treatment,water was discharged underground via 2-inch diameter PVC piping <br /> to the City of Manteca sewer system, discharge piping is connected to a sewer manhole located <br /> ' approximately 25 feet south of the pump-and=treat system <br /> Based on effluent flow meter readings (Table 1), approximately 240,109 gallons of treated water <br /> ' were extracted and discharged to the City of Manteca sewer system between 06 June and 26 <br /> September 2002 under City of Manteca Public Works Department(CMPWD)Industrial Wastewater <br /> Discharge Permit No 02-1 <br /> 1 i <br /> 2 2 GROUND WATER PUMP-AND-TREAT SAMPLING PROCEDURES <br /> Ground water pump-and-treat influent, middle and effluent water samples were collected from <br /> valved ports located upstream (influent), after the second treatment media vessel and downstream <br /> (effluent) of the treatment unit The grab water samples were collected utilizing 40-m1 EPA- I <br /> approved VOA vials containing 0 5 ml 18%hydrochlonc acid as a sample preservative and 1-liter <br /> amber'bottles Care was taken to ensure that visible air bubbles were not present in the vials after <br /> ' <br /> filling and capping Ground water sample containers were labeled with a sample designation,date, <br /> time, and sampler's initials <br /> 2 3' I LABORATORY ANALYSIS OF GROUND WATER PUMP-AND-TREAT SAMPLES <br /> Influent and effluent grab water samples were logged on a chain-of-custo dy form,pla6ed in a chilled <br /> container and transported to a California Department of Health Services(DHS)-certified'laboratory I' <br /> for'analysis for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and, TPH-d, <br /> I respectively) by EPA Methods 3550/503018015 Modified, <br /> t I <br /> <<i { Advanced CeoEnvlronmental,Inc 1' <br /> , <br />