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I I26 September 2003 • AGE-NC Project No 95-0128 ' Page 4 of 8 ' Benzene, toluene, ethyl benzene and xylene (BTEX) and fuel additives di-isopropyl ether (DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary-amyl methyl ether(TAME),tertiarybutanol(TBA),methanol,ethanol,ethylene dibromide(EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260 Modified ' 26 INTERIM REMEDIATION ' Between 16 December and March 31 2002, an interim ground water pump-and-treat system was in continuous operation at the site, interim ground water pump-and-treat operation and maintenance procedures for the site were outlined in Monitoring Well Installation and Interim Ground Water ' Remediation I2 6 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 and first quarter 2003 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 via 1-inch diameter, schedule 80 polyvmylchlonde (PVC)pipe aboveground along the west side of the site to the City of Stockton discharge line located in Rose Mane Lane A diagram of the remediation system is provided in Figure 2a Based on effluent flow meter readings(Table 4),approximately 92,546 gallons of treated water were I extracted and discharged to the City of Stockton sewer system during the late fourth quarter 2002 and first quarter 2003 under City of Stockton Public Works Department (SPVM) Industrial Wastewater Discharge Permit No 01 2 6 2 Ground water Extraction System Water Sampling Procedures Between January and March 2003, AGE collected grab ground water samples from the water 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 IAdvanced GeoEnvironmentai Inc