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1 v j. �e 4 m A S S O C I A T E S I N C Vapor Analytical Results ' TPHg and BTEX constituents were detected in all of the vapor samples except from the effluent sample taken on January 28, 2004 TPHg concentrations in samples collected from vapor wells VW1, VW2, VW4, and MW1 ranged from 5 7 parts per million by volume (ppmv) to 360 ppmv 1 The influent concentrations of TPHg ranged from 39 ppmv to 190 ppmv and the effluent concentration of TPHg ranged from <2 5 ppmv to 86 ppmv Benzene concentrations in samples collected from vapor V W 1, VW2, VW4, and MW 1 ranged from <0 05 to 2 8 ppmv The influent 1 concentrations of benzene ranged from 0 46 ppmv to 0 62 ppmv and the effluent concentrations ranged from <0 050 ppmv to 1 8 ppmv The effluent concentrations are within the requirements of the San Joaquin Valley Air Pollution Control District (SJVAPCD) permit to operate Vapor ' analytical data are summarized in Table 2 and vapor data sheets are contained in Attachment 4 ' Water Treatment System Analytical Results The influent and effluent water samples collected from the treatment and discharge component of ' the vapor extraction system contained no detectable concentrations of TPHg, BTEX, MTBE, TAME, ETBE, DIPE, TBA, 1,2-DCA, or EDB A summary of analytical results is presented in Table 3 Groundwater laboratory data sheets and chain-of-custody documentation are contained in Attachment 2 Air Sparge System Monitoring 1 The installation of the air sparge piping system located at the site is detailed in ATC's Remediation System Installation Report for the Farmer Property, 610 North Hunter Street, ' Stockton, California, dated April 8, 2003 ATC started the air sparge system on February 13, 2003 During the current reporting period, ATC personnel monitored the air sparge system on January 28, February 23, and March 26, 2004 Parameters monitored in the field included flow rates and ' induced pressure responses at on-site wells if applicable Field monitoring data are contained in Attachment 3 ' REMEDIATION SYSTEM EVALUATION Vapor Extraction System From December 30, 2003 to March 26, 2004, the vapor extraction system was operational for approximately 936 hours From December 30, 2003 to March 26, 2004, the average extracted vapor flowrate was approximately 53 cubic feet per minute (cfin) and the average influent vacuum achieved by the thermal oxidizer was 16 inches of mercury, based on the information contained on the field monitoring data sheets contained in Attachment 3 Based on influent flowrate of 53 cfm, average influent concentration of TPHg of 142 ppmv, and using the values supplied by SunStar Labs of 24 5 liters of vapor per mole of TPHg and a molecular weight of 86 27 grams per mole of TPHg yields s lenviro1625961quar11y11 qr-2004 doe 5