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M r , <br /> ! h <br /> l ! <br /> i01 November 2005 <br /> . AGE-NC Project No 95-0142 <br /> Page 2 of 8 <br />' Effluent SVE stream soil-vapor samples were collected on 20 April, 26 May and 23 August 2005 <br /> The soil-vapor samples were collected in Tedlar vapor bags using a vacuum pump attached to the <br /> SVE effluent stream The samples were labeled,placed in a pre-chilled cooler and transported under <br />' chain of custody to McCampbell Analytical, Inc (MAI) The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> and methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8021 <br />' 22 GROUND WATER TREATMENT OPERATION <br /> The ground water treatment system is designed to operate at a maximum flow rate above 10 gallons <br />' per minute(GPM) Ground water is extracted from the primary extraction well EW-1 at a flow rate <br /> of approximately 2 GPM, in addition, ground water is also being extracted from the deep-screened <br /> casing of dual-completed vapor wells VW-1 and VW-3, at a maximum flow rate of 125 GPM <br />' • Theround water treatments operates n stem o <br /> g y p o a batch basis Once the holding tank fills with <br />' sufficient water, approximately 75 gallons of extracted ground water are treated and discharged <br /> Since only 14,000 gallons of treated water(effluent)may be discharged daily to the City of Stockton <br /> sewer system, the effluent discharge was adjusted to a flow rate not to exceed 10 GPM <br />' In order to verify and quantify the mass of contamination from each extraction well and to comply <br /> with the requirements of the City of Stockton discharge permit, monthly monitoring and sampling <br />' of influent and effluent ground water was performed on 20Apn1, 26 May, 15 June, 14 July, 23 <br /> August and 13 September 2005 The samples were collected in laboratory-supplied 40-milliliter(ml) <br /> Environmental Protection Agency(EPA)-approved volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18%hydrochloric acid as a preservative and 1-liter amber bottles without preservative, and <br /> then labeled with the sample designation, date, time, and sampler's initials The labeled samples <br /> were logged on a chain of custody farm, placed in a chilled container and transported to MAI, a <br /> California Department of Health Services (DHS)-certified laboratory for analysis <br /> The samples were analyzed for <br /> • TPH-g and TPH-diesel (TPH-d) - effluent by EPA Method 8015 Modified, <br /> • BTEX in accordance with EPA 826413, <br /> Advanced GeoEnvironmental,Inc ' <br />