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v � <br /> A S S O C I A T E S I N C <br /> extraction system The effluent water sample collected from the treatment and discharge <br /> component of the vapor extraction system contained no detectable concentrations of TPHg or <br /> BTEX MTBE, TAME, ETBE, DIPE, TBA, 1,2-DCA, and EDB were not detected to the <br /> influent or effluent samples, although the detection limits of the influent sample were elevated <br /> due to non-target analytes A summary of analytical results is presented in Table 3 <br /> Groundwater laboratory data sheets and chain-of-custody documentation are contained in <br /> Attachment 2 <br /> REMEDIATION SYSTEM EVALUATION <br /> Vapor Extraction System <br /> From December 19 to December 27, 2002, the vapor extraction system was operational for <br /> approximately 200 hours During that time, the average extracted vapor flowrate was 85 cubic feet <br /> per minute (cfm) and the average influent vacuum achieved by the thermal oxidizer was 9 5 inches <br /> of mercury <br /> Based on influent flowrate of 85 cfm, average influent concentration of TPHg of 1,800 ppmv, <br /> and using the values supplied by SunStar Labs of 24 5 liters of vapor per mole of TPHg and a <br /> . molecular weight of 86 27 grams per mole of TPHg yields <br /> = 1,800 1 TPHg x 85 ft3 x 60 min x 28 32 1 air x 1 mole TPHg x 86 27 gg x 1 Ib <br /> 1,000,0001 air min 1 hour 1 ft3 24 51 vapor mole TPHg 454 g <br /> = 2 TPHg x 200 hours = 400 lbs of TPHg since the system startup <br /> hour <br /> The same calculation for benzene with 24 5 liters of vapor per mole and a molecular weight of 78 <br /> grams per mole is shown below <br /> = 191 benzene x 85 ft3 x 60 min x 28 32 1 air x 1 mole benzene x 76 gx i Ib <br /> 1,000,0001 air min 1 hour T ft3 24 51 vapor mole benzene 454 g <br /> 0 019 Ib benzene x 200 hours = 3 8 lbs of benzene since the system startup <br /> hour <br /> Water Treatment System <br /> From December 19 to December 27, 2002, the average groundwater extraction rate from the vapor <br /> extraction system knockout drum was 38 gallons per hour and the total groundwater discharged to <br /> the City of Stockton sewer system was 7,510 gallons <br /> Assuming 7,510 gallons of groundwater was extracted from vapor wells VW 1, V W2, V W3, and <br /> . V W4 and the average influent concentrations of TPHg and total BTEX were approximately <br /> 61,000 ppb and 15,190 ppb, respectively, the following calculation determines the amount of <br /> w lwordpro1625961quardyl4gr-2002 doc 5 <br />