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1 <br /> 1 <br /> . 30 June 2003 <br /> AGE-NC Project No 95-0103 <br /> Page 2 of 7 <br /> ' under permit during the fourth quarter 2002 (Table 4) The ground water treatment system operates <br /> on a batch basis, with a daily total of 14,400 gallons Once the 2,000-gallon holding tank fills, <br /> approximately 3,000 gallons of extracted ground water is treated and discharged The discharge of <br /> ' treated water(effluent)to the City of Stockton was adjusted at a flow rate of approximately 10 GPM <br /> ' 2 2 GROUND WATER TREATMENT MONITORING PROCEDURES <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 samples were performed Grab ground water samples were <br /> ' collected on 17 February, 24 March and 15 April 2003 from extraction wells EW-1, EW-2, EW-3 <br /> and VW-6 and the effluent port of the treatment system and on 09 January 2003 from the influent <br /> and effluent sampling ports of the treatment system <br /> Influent samples were collected in laboratory-supplied 40-m1 EPA-approved volatile organic analysis <br /> (VOA) vials containing 0 5 ml 18% hydrochloric acid as a preservative Effluent samples were <br /> collected in the (VOA) vials, 1-liter amber bottles without preservative and 500-milliliter plastic <br /> bottles without preservative Care was taken to ensure that visible air bubbles were not present in <br /> the vials after filling and capping Water sample containers were labeled with the sample <br /> designation, date, time, and sampler's initials <br /> The samples collected were logged on a chain-of-custody form, placed in a chilled container and <br /> transported to McCampbell Analytical Inc (MAI), a California Department of Health Services <br /> (DHS)-certified laboratory, for analysis Samples were analyzed for <br /> ' Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 <br /> Modified, and <br /> ' Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl-tertiarybutyl ether(MTBE) <br /> by EPA Methods 8020 or 8260 <br /> In addition,the effluent samples were analyzed for pH in accordance with EPA Method 150 1 and <br /> total petroleum hydrocarbons quantified as diesel (TPH-d) by EPA Method 8015 Modified <br /> ' <br /> 23 QUARTERLY GROUND WATER MONITORING AND SAMPLING <br /> ' On 21 and 23 April 2003, ground water monitoring and sampling were performed on monitoring - <br /> . wells MW-1 through MW-7 and vapor extraction well EW-5 at the request of the EHD <br /> 1 <br /> Advanced GeoEnviroamental,Inc <br />