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• A S S d C I A T E 5 I N C Vapor Analytical Results TPHg and BTEX constituents were detected in all of the vapor samples, with the exception of the effluent vapor sample collected on June 25, 2003 Petroleum hydrocarbons were not detected at or above the laboratory reported detection limits in the effluent vapor sample collected on June 25, 2003 TPHg concentrations in samples collected from vapor wells VW1, VW2, VW3, and VW4 ranged from 75 parts per million by volume (ppmv) to 2,000 ppmv The influent concentrations of TPHg ranged from 330 ppmv to 840 ppmv and the effluent concentration of TPHg ranged from <0 500 ppm to 23 ppmv Benzene concentrations in samples collected from vapor wells VWl, VW2, VW3, and VW4 ranged from <0 050 to 2 2 ppmv The influent concentrations of benzene ranged from 0 38 ppmv to 2 0 ppmv and the effluent concentration ranged from <0 005 ppm to 0 053 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 i TPHg and BTEX 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, although the detection limits associated with the influent samples collected on May 21 and June 9 and 25, 2003 were elevated due to non-target analytes 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 April 18 and 30, May 2 and 21, and June 9 and 25, 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 From March 27 to June 25, 2003, the vapor extraction system was operational for approximately 1,587 hours From March 27 to June 25, 2003, the average extracted vapor flowrate was w lwordpro1625961quart1yl2gr-2003 doc 5