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t 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 November 21, 2003 TPHg concentrations in samples collected from vapor wells ' VW1, VW2, VW3, and VW4 ranged from <2 5 parts per million by volume (ppmv) to 1,400 ppmv The influent concentrations of TPHg ranged from <2 5 ppmv to 440 ppmv and the effluent concentration of TPHg ranged from <2 5 ppmv to 29 ppmv Benzene concentrations in samples collected from vapor wells V W 1, VW2, VW3, and VW4 ranged from <0 05 to 0 83 ppmv The influent concentrations of benzene ranged from 0 27 ppmv to 0 41 ppmv and the effluent concentrations were all reported at <0 05 ppmv The effluent concentrations are within the t 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 tWater Treatment System Analytical Results Low concentrations of TPHg, Toluene, and/or Xylenes were detected above laboratory reported detection limits in the influent water samples collected from the groundwater treatment and discharge component of the vapor extraction system The effluent water samples collected from the treatment and discharge component of the vapor extraction system contained no detectable concentrations of TPHg or BTEX MTBE, TAME, ETBE, DIPE, TBA, 1,2-DCA, and EDB were not detected in the influent or effluent samples 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 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 October 24, tNovember 21 and December 30, 2003 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 t From September 30 to December 30, 2003, the vapor extraction system was operational for approximately 1,650 5 hours From September 30 to December 30, 2003 the average extracted vapor flowrate was approximately 170 cubic feet per minute (cfm) and the average influent vacuum s lenviro1625961quart1yl4gr-2003 doe 5 t