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' 23 September 2002 i AGE-NC Project No 95-0128 ' Page 3 of 7 ' 3 1 GROUND-WATER EXTRACTION SYSTEM OPERATION On-site extraction well EW-1 was adjusted at the well-head to continuously extract ground water ' during the second quarter 2002 at an average flow rate of 3 5 GPM,the extracted ground water was routed through a ground water treatment system consisting of granular activated carbon(GAC)and Sunsolve® Following treatment,water was discharged underground via 1-Inch diameter, schedule ' 80 polyvinylchlonde(PVC)pipe underground along the west side of the site to the City of Stockton discharge line located In Rose Marie Lane A diagram of the remediation system is provided In Figure 2a ' Based on effluent flow meter readings (Table 4), approximately 280,000 gallons of treated water were extracted and discharged to the City of Stockton sewer system during the second quarter 2002 Iunder City of Stockton Public Works Department(SPWD)Industrial Wastewater Discharge Permit No 01 32 GROUND-WATER EXTRACTION SYSTEM WATER SAMPLING PROCEDURES I ! On 22 April, 13 May and Ob June 2002, AGE collected grab ground water samples from the water treatment system, the water samples were collected from valved ports located upstream (Influent) and downstream(effluent)of the treatment unit In addition, a mid-treatment steam sample was also collected on 13 May 2002 to analyze for MTBE break-though, the mid-treatment sample was collected from a dedicated brass sampling port at the Inlet to the second GAC vessel Influent and mid-treatment samples were collected in laboratory-supplied 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative,and Into 1-liter amber bottles without preservative Effluent samples were collected in the same containers and Into 500-milliliter plastic bottles without preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping IWater sample containers were labeled with the sample designation,date,time,and sampler's initials Subsequently,the samples were logged on a chain-of-custody form,placed in a chilled container and transported to MAI for analysis The samples were analyzed for • TPH-g and TPH-d by EPA Method 8015 Modified, and • BTEX and MTBE by EPA Methods 8020 In addition,to satisfy SPWD Industrial Wastewater Discharge Pennit No 01, effluent ground water samples were analyzed for IAdvanced CeoEnvironmental Inc