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1 � <br /> A S S O C I A T E S I N C <br /> Vapor Analytical Results <br /> TPHg and BTEX constituents were detected in all of the vapor samples TPHg concentrations in <br /> samples collected from vapor wells VW1, VW2, VW3, and VW4 ranged from 28 parts per million <br /> by volume (ppmv) to 2,300 ppmv The influent concentrations of TPHg ranged from 330 ppmv to <br />' 390 ppmv and the effluent concentration of TPHg ranged from 6 ppm to 13 ppmv Benzene <br /> concentrations in samples collected from vapor wells VW1, VW2, VW3, and VW4 ranged from <br /> 0 53 to 2 5 ppmv The influent concentrations of benzene ranged from 0 63 ppmv to 0 80 ppmv <br /> and the effluent concentration was continuously below 0 005 ppmv The effluent concentrations are <br /> within the requirements of the San Joaquin Valley Air Pollution Control District (SJVAPCD) <br />' permit to operate Vapor analytical data are summarized in Table 2 and vapor data sheets are <br /> contained in Attachment 4 <br />' Water Treatment System Analytical Results <br /> TPHg and BTEX were detected above laboratory reported detection limits in the influent water <br /> samples collected from the groundwater treatment and discharge component of the vapor <br /> extraction system The effluent water samples collected from the treatment and discharge <br /> component of the vapor extraction system contained no detectable concentrations of TPHg or <br /> M BTEX MTBE, TAME, ETBE, DIPE, TBA, 1,2-DCA, and EDB were not detected in the <br /> influent or effluent samples, although the detection limits associated with the influent samples <br /> collected on July 28, August 29, and September 30, 2003 were elevated due to non-target <br /> analytes A summary of analytical results is presented in Table 3 Groundwater laboratory data <br /> sheets and chain-of-custody documentation are contained in Attachment 2 <br /> 1 Air Sparge System Monitoring <br /> The installation of the air sparge piping system located at the site is detailed in ATC's <br />' Remediation System Installation Report for the Farmer Property, 610 North Hunter Street, <br /> Stockton, California, dated April 8, 2003 ATC started the air sparge system on February 13, 2003 <br /> During the current reporting period, ATC personnel monitored the air sparge system on August 1 <br />' 29, and September 30, 2003 Parameters monitored in the field included flow rates and induced <br /> pressure responses at on-site wells if applicable Field monitoring data are contained in <br />' Attachment 3 <br /> REMEDIATION SYSTEM EVALUATION <br /> Vapor Extraction System <br />' From June 25 to September 30, 2003, the vapor extraction system was operational for <br /> approximately 2,030 hours From June 25 to September 30, 2003 the average extracted vapor <br /> flowrate was approximately 100 cubic feet per minute (cfm) and the average influent vacuum <br /> w Iwordpro1625961quart1yl3gr-2003 doc 5 <br />