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v o • A S S 0 C I A T E S I N C hydraulic gradient on December 5, 2002 was calculated to be 0 007 ft/ft or approximately 34 ft/mile A summary of groundwater monitoring data is presented in Table 1 REMEDIATION SYSTEM MONITORING ACTIVITIES The installation and startup of the vapor extraction 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 After the modifications described in the Remediation System Installation Report were made to the system, ATC started the vapor extraction system on December 19, 2002 and monitored the vapor extraction system on December 20, 23, and 27, 2002 Parameters monitored in the field included vapor extraction flow rates, induced vacuum responses at on-site wells if applicable, hydrocarbon vapor concentrations with an organic vapor momtor, groundwater extraction rate, total groundwater discharged to the City of Stockton sewer service, and total hours of system operation Field monitoring data is contained in Attachment 3 On December 20, 2002, ATC collected vapor samples from wells V W 1, V W2, VW3, and V W4 and from the influent and effluent of the vapor extraction system The samples were transported under chain-of-custody documentation to SunStar Laboratories, Inc (ELAP #2250) in Tustin, California and were analyzed for VOCs by EPA method TO-14 On December 27, 2002, ATC collected water samples from the groundwater treatment and discharge component of the vapor extraction system Water samples were collected from the influent and effluent of the groundwater treatment system and transported under chain-of-custody documentation to Argon Labs for analysis The water samples were analyzed for TPHg by EPA method 8015, BTEX by EPA method 8020, and MTBE, TAME, ETBE, DIPE, TBA, 1,2-DCA, and EDB by EPA method 8260 Vapor Analytical Results TPHg, BTEX, 1,3,5-tnmethylbenzene, and 1,2,4-tnmethylbenzene were detected in all of the vapor samples TPHg concentrations in the vapor wells ranged from 56 parts per million by volume (ppmv) to 1,000 ppmv The influent concentration of TPHg was 1,800 ppmv and the effluent concentration of TPHg was 280 ppmv Benzene concentrations in the vapor wells ranged from 0 47 to 10 ppmv The influent concentration of benzene was 19 ppmv and the effluent concentration was 3 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 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 w Iw0rdpro1625961quan1y14gr-2002 doc 4