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I <br /> ll <br /> f <br /> 15,September 2003 I i <br /> AGE-NC Project No 97-0333 <br /> Page 2 of 11 <br /> r � , <br /> I <br /> 2.0 GROUND WATER PUMP AND TREAT REMEDIATION SYSTEM <br /> t Between 27 March 2003 and 19 June 2003 (second quarter 2003), a ground water pump-and-treat <br /> Interim remediation system was in continuous operation at the site The Interim ground water pump- <br /> '' a and-treat system operation and maintenance procedures for the site were outlined in AGE's Interim <br /> Remediation Work Plan -June 2001, dated 21 June 2001 <br /> '2 11 , GROUND WATER PUMP AND TREAT OPERATION <br /> During the second 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, extracted ground water was routed <br /> ' tliiough 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 /> I <br /> l r <br /> Based on effluent flow meter readings (Table 5), approximately 231,275 gallons of treated water <br /> were extracted and discharged to the City of Manteca sewer system between 27 March 2003 and 19 I <br /> I' June 2003 under City of Manteca Public Works Department (CMPWD) Industrial Wastewater, <br /> Discharge Permit No 02-1 <br /> ' I <br /> l <br /> i' <br /> i' <br /> 22 ' GROUND,WATER PUMP AND TREAT SAMPLING PROCEDURES <br /> F Ground water pump-and-treat influent,intermediate and,effluent water samples were collected from n, € <br /> ' valved ports located upstream (influent),I after'the 'second treatment media vessel (GAC-2) and II I <br /> downstream(effluenlt)of the treatment unit The grab water samples were collectedI utilizing 40-m1 <br /> r' <br /> EPA-approved volatile organic analI. ysis(VOA) vials contamydroc <br /> ing10 5 ml 18%hhloric acid as a <br /> �, <br /> sample preservative and l;liter amber bottles Care was taken-to ensure that visible air bubbles were,'' ;i' <br /> I <br /> f , not present m the vials after filling and capping Ground water sample containers were labeled with E <br /> a sample deslgnatiori; date, time, and sampler's initials <br /> ` jl, <br /> I'I 2 3 LABORATORY ANALYSIS OF GROUND WATER PUMP-AND-TREAT SAMPLES <br /> I' I <br /> IF Influent, Intermediate(GAC-2) and effluent grab water samples were logged on a chainhof-custody <br /> form, placed in a chilled container and transported to a California Department of HealthlServices <br /> I� (DHS)-certified laboratory for analysis for " { <br /> , � I <br /> i I a l I <br /> Advanced' GeoEnvira,, <br /> nmental,Inc <br /> r4 <br />