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01 November 2002 <br /> . AGE-NC Project No 95-0103 <br /> ' Page 2 of 6 <br /> ' under permit during the third quarter 2002 (Appendix B) The ground water treatment system <br /> operates on a batch basis, with a daily total of 14,400 gallons Once the 2,000-gallon holding tank <br /> fills,approximately 1,750 gallons of extracted groundwater is treated and discharged The discharge <br /> of treated water (effluent) to the City of Stockton was adjusted at a flow rate of approximately <br /> 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 15 July and 22 August 2002 from the influent and effluent sampling ports of the <br /> treatment system Influent samples were collected in laboratory-supplied 40-m1 EPA-approved <br /> volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a preservative <br /> ' Effluent samples were collected in the (VOA) vials, 1-liter amber bottles without preservative and <br /> 500-milliliter plastic bottles without preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Water sample containers were labeled with <br /> ' the sample 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 The effluent samples were analyzed for <br /> ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 <br /> Modified, <br /> • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-tertiarybutyl ether(MTBE) <br /> by EPA Methods 8020, and <br /> • pH in accordance with EPA Method 150 1 <br /> 23 QUARTERLY GROUND WATER MONITORING AND SAMPLING <br /> On 09 September 2002,ground watermonitonng and sampling were performed on monitoring wells <br /> MW-2 through MW-6 <br /> 1 <br /> ' Advanced GeoEnwonmental,Inc <br /> 1 , <br />