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1} r <br /> Y 1 1 <br /> r <br /> 27 September 2004 <br /> r <br /> AGE-NC Project No '95-0142 ' 1 <br /> Page 2of7 <br /> attached to the influent and effluent stream In June soil vapor samples were collected at vapor"well <br /> inlets points from wells EW-1,VW-1,VW-3 and VW-4 The samples were labeled,placed in apre- <br /> chilled cooler and transported under chain of custody to Cal Tech Environmental Laboratories <br /> (CTEL) or McCampbell Analytical, Inc (MXI) The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA s r, <br /> Method 8015 Modified and <br /> r r� <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> and methyl tertiary butyl ether (MTBE) in accordance with EPA Method{8020 <br /> 1 In July a work plan for.SVE modification was submitted to the EHD proposing replacement of the r <br /> h catalytic-oxidizer VES due to excessive operational costs (energy) and low SVE` influent <br /> concentrations A stand-alone SVE vacuum pump (regenerative blower)model Fuji VFC 100P was <br /> connected to the SVE network and started operation on 30 July 2004 Effluent SVE stream soil vapor <br /> samples were collected on 02 August and 18 August 2004 F <br /> 1 <br /> 1 t , <br /> � 1 1 <br /> 2 2 GROUND WATER TREATMENT OPERATION <br /> The ground water treatment system is designed to operate at a maximum flow rate of up to <br /> 10 gallons per minute (GPM), the primary extraction well (EW-1) extracts ground water at a flow <br /> rate of approximately 5 GPM The ground water treatment system operates on a batch basis, with <br /> a daily total of up to 3,000 gallons Once the 300-gallon holding tank fills, approximately <br /> 150 gallons of extracted ground water are treated and discharged The discharge of'treated water ' <br /> (effluent) to the City'of Stockton was adjusted at a flow rate of approximately 10 GPM <br /> IIn 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 21 April, 27 May, 25 June, 22 July and x <br /> ' 18 August 2004 The samples were collected in laboratory-supplied 40-m1 EPA-approved volatile a <br /> organic analysis (VOA)vials containing 0 5 ml 18%hydrochloric acid as a preservative and 1 niter „ <br /> ambef bottles without preservative, and then labeled with the sample designation, date, time, and <br /> sampler's initials The labeled samples were logged on a chain of custody form, placed in a chilled <br /> ' , 4 container and transported to McCampbell Analytical Inc'(MAI),a California Department of Health t <br /> Services,(DHS)-certified laboratory, for analysis The samples were analyzed for , <br /> • TPH-g and TPH-d (diesel) - effluent by EPA Method 8015 Modified, <br /> • BTEX in accordance with EPA 826013, ;I <br /> Advanced Geo Environmental,Inc I <br /> 1 t <br /> r <br /> ! 2 <br /> r <br /> M1 I ! <br /> f <br /> i R <br />