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t04 May 2005 AGE-NC Project No 95-0142 Page 2 of 9, ' Effluent SVE stream soil-vapor samples were collected on 15 December 2004, 18 January, 25 January, 17 February and 17 March 2005 The soil-vapor samples were collected in Tedlar vapor bags using a vacuum pump attached to the SVE effluent stream The samples were labeled,placed ' in a pre-chilled cooler and transported under chain of custody to McCampbell Analytical,Inc (MAI) The samples were analyzed for ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified, and ' • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether (MTBE) in accordance with EPA Method 8020 1 22 GROUND WATER TREATMENT OPERATION ' The ground water treatment system is designed to operate at a maximum flow rate of up to 10 gallons per minute (GPM) Ground water is extracted from the primary extraction well EW-1 at a flow rate of approximately 2 GPM,in addition,ground water is also being extracted from the deep- screened casing of dual-completed vapor wells VW-1 and VW-3, at a maximum flow rate of 125 GPM ' The ground water treatment system operates on a batch basis, once the holding tank fills with sufficient water, approximately 75 gallons of extracted ground water are treated and discharged Since only 14,000 gallons of treated water(effluent)may be discharged daily to the City of Stockton sewer system, the effluent discharge was adjusted at a flow rate not to exceed 10 GPM In order to verify and quantify the mass of contamination from each extraction well and to comply with the requirements of the City of Stockton discharge permit, monthly monitoring and sampling of influent and effluent ground water was performed on 15 December 2004,25 January, 17 February, I 17 March 2005 The samples were collected in laboratory-supplied 40-milliliter(ml)Environmental Protection Agency (EPA)-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a preservative and 1-liter amber bottles without preservative, and then labeled with the sample designation,date,time,and sampler's initials The labeled samples were logged on a chain of custody form, placed in a chilled container and transported to MAI, a California Department of Health Services (DHS)-certified laboratory for analysis The samples were analyzed for TPH-g and TPH-diesel (TPH-d) - effluent by EPA Method 8015 Modified, Advanced GeoEnvironmental,Inc