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� v A S S D 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 samples collected on April 26 and June 28, 2004 TPHg concentrations in samples collected from vapor wells V W 1, V W2, V W4, and MW 1 ranged from 3 2 parts per million by volume (ppmv) to 88 9 ppmv The influent concentrations of TPHg ranged from 28 0 ppmv to 64 1 ppmv and the effluent concentration of TPHg ranged from <2 0 ppmv to <2 5 ppmv Benzene concentrations in samples collected from vapor wells VWl, VW2, VW4, and MW1 ranged from <0 050 to 1 57 ppmv The influent concentrations of benzene ranged from 0 63 ppmv to 0 66 ppmv and the effluent concentrations were <0 050 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 analytical 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, with the exception of the influent sample collected on June 28, 2004 TPHg was detected in the influent groundwater sample at a concentration of 59 ug/l 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 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 26, May 26, and June 28, 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 March 26, 2004 to June 28, 2004, the vapor extraction system was operational for approximately 1,355 hours The average extracted vapor flowrate was approximately 72 cubic feet per minute (cfm) and the average influent vacuum achieved by the thermal oxidizer was 20 inches ' of mercury, based on the information contained on the field monitoring data sheets contained in Attachment 3 s\env iro1625961quan1yl2gr-2004 doc 5