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' 12 February 2003 . AGE-NC Protect No 95-0128 ' Page 3 of 7 ' 2 2 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 fourth quarter 2002 at an average flow rate of less than 2 gallons per minute(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 polyvinylchloride(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 267,904 gallons of treated water were extracted and discharged to the City of Stockton sewer system during the late third and fourth ' quarters 2002 under City of Stockton Public Works Department (SPWD) Industrial Wastewater Discharge Permit No 01 222 Ground water Extraction System WaterSampling Pro cedures Between September and December 2002,AGE collected grab ground water samples from the watei treatment system, from valved ports located upstream (influent) and downstream (effluent) of the treatment unit The influent 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 Water 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 The samples were analysis for - TPH-g and TPH-d by EPA Method 8015 Modified, and - BTEX and MTBE by EPA Methods or 8020 or 8260 In addition, to satisfy SPWD Industrial Wastewater Discharge Permit No 01, the pH of effluent ground water samples collected on 13 November and 16 December 2002 were analyzed in accordance with EPA Method 150 1 • Advanced GeoEnvironmental Inc