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08 January 2004 <br /> AGE'-NC Project No 95-0103 <br /> Page 2 of 8 <br /> Effluent flow meter readings utilizing a Blue-White Industries F-2000 flow meter recorded <br /> approximately 250,254 gallons (947,2114 liters) of impacted ground water treated and discharged <br /> to the City of Stockton sewer system under permit during the fourth quarter 2003 (Table 4) The <br /> J <br /> ground water treatment system operates on a batch basis,with an average daily total of 2,700 gallons <br /> ,Once the 2,000-gallon holding tank is filled, approximately 1,500 gallons of extracted groundwater <br /> is treated and discharged The discharge of treated water(effluent)to the City of Stockton had been ! <br /> increased by removing bio fouling of the carbon media,with a maximum flow rate of approximately <br /> 15 gpm <br /> F N <br /> ,I 1 <br /> 2 2 GROUND WATER TREATMENT MONITORING PROCEDURES <br /> 1 <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 of <br /> influent and effluent ground water samples were performed Grab ground water samples were <br /> collected on 18 October, 17 November,24 November and 15 December 2003 from extraction wells <br /> EW-1, EW-2, EW-3 and VW-6 through dedicated sampling ports at the inlet to the remediation <br /> system holding tank and the effluent part of the treatment system an all sampling events On 17 <br /> November, after a month-long hiatus of the ground water extraction system, separate grab, in-situ <br /> ground water samples were collected from extraction wells EW-1, EW-2, EW-3 with disposable <br /> bailer <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 bottles <br /> without preservative Cai e was taken to ensure that visible air bubbles were not present in the vials <br /> after filling and capping Water sample containers were labeled with the sample designation, date, <br /> 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 Cal Tech Environmental Laboratories, Inc (CTEL) or McCampbell Analytical Inc <br /> (MAI)a Cali fornta Department ofHealth Services(DHS)-certified laboratories,for analysis Samples <br /> were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 <br /> Modified, and <br /> Benzene, toluene, ethyl benzene and total xylene (BTEX) and methyl-tertiary butyl ether <br /> (MTBE) by EPA Methods 8020 or 8260 <br /> r <br /> Advanced GeoEnvironmental,Inc <br /> s <br />