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� v A 1 A S S O C I A T E S I N C Vapor Analytical Results TPHg and BTEX were detected in all of the vapor samples TPHg concentrations in vapor wells V W 1 and V W2 ranged from 480 parts per million by volume (ppmv) to 3,300 ppmv The influent concentration of TPHg ranged from was 1,300 ppmv to 3,500 ppmv and the effluent concentration ' of TPHg ranged from 3 7 ppm to 66 ppmv Benzene concentrations in vapor wells VW 1 and V W2 ranged from 0 82 to 10 ppmv The influent concentration of benzene ranged from 4 3 ppmv to 9 2 ppmv and the effluent concentration ranged from 0 0029 ppm to 0 22 ppmv The effluent ' concentrations are within the requirements of the San Joaquin Valley Air Pollution Control District (SJVAPCD) permit to operate Vapor analytical data is summarized in Table 2 and vapor data sheets are contained in Attachment 4 Water Treatment System Analytical Results ' TPHg and BTEX were detected above laboratory method detection limits in the influent water sample collected from the groundwater treatment and discharge component of the vapor ' extraction system The effluent water sample collected from the treatment and discharge component of the vapor extraction system contained no detectable concentrations of TPHg or BTEX MTBE, TAME, ETBE, DIPS, TBA, 1,2-DCA, and EDB were not detected in the influent or effluent samples, although the detection limits of the influent sample 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 piping sparge system stem 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 this reporting period, ATC personnel monitored the air sparge system on February 21 and 28 and March 14, 21, and 27, 2003 Parameters monitored in the field included flow rates and induced pressure responses at on-site ' wells if applicable Field monitoring data is contained in Attachment 3 4n February 13, 2003, ATC collected groundwater samples from groundwater wells MW 1 and MW3, the groundwater monitoring wells located closest to air sparge wells ASI and AS2, to establish base line ' concentrations of petroleum hydrocarbons prior to starting the air sparge system The groundwater samples collected from each well were submitted to State-certified Argon Laboratories for chemical analysis of TPHg and BTEX utilizing EPA methods 8015/8020 and MTBE, ETBE, TBA, TAME, DIPS, 1,2-DCA, and EDB utilizing EPA method 8260 w lwordpro1625961quart1yll qr-2003 doc 5