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� v 0 1 A S S O C I A T E S I N C The vapor extraction wells were constructed with 2-inch PVC casing to depths of approximately 25 feet bgs The screen interval in the vapor extraction wells was placed from 15 to 25 feet bgs ' The air sparge wells were constructed with 2-inch PVC casing to depths of approximately 40 feet bgs The screen interval in the vapor extraction wells was placed from 35 to 40 feet bgs Construction details are depicted on the well logs contained in Appendix A 1 4.4 Air Sparge Well Development Air sparge wells AS 1 and AS2 were developed on January 18, 2002 Each well was purged until the extracted water was relatively sediment free Development logs are included in Appendix C ' Purgewater was temporarily stored on site in DOT approved 55-gallon drums 4.5 Air Sparge Well Sampling and Analysis On January 18, 2002, oundwater samples were �' p collected from air sparge wells AS 1 and AS2 Prior to collecting groundwater samples, fluid levels were taken utilizing an electronic water probe 1 capable of measuring with an accuracy of 11100 of a foot Groundwater elevation data are presented in Table 2 The samples were collected after purging a mimmum of three well volumes and stabilization of electric conductivity, pH, and temperature Field purge logs are presented in Appendix C Subsequent to purging, groundwater was sampled and transferred to appropriate sample containers, using clean, disposable bailers with bottom emptying devices to reduce ' volatilization Groundwater samples were placed on ice and delivered under chain-of-custody documentation to Argon for chemical analysis Selected groundwater 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 The analytical results for groundwater samples are summarized 1 in Table 2 Laboratory data sheets and chain-of-custody documentation are included in Appendix D 5.0 REMEDIATION SYSTEM INSTALLATION 5.1 Trenching and Piping Activities ' During the week of April 15 2002 ATC supervised the trenching P � p and plumbing activities to install the subsurface piping that directs extracted vapor from the wells to a nearby remediation compound ' and directs air generated by the blower to the air sparge wells ' Cal-West Concrete Cutting sawcut the asphalt/concrete surface of the site in the locations where the subsurface piping was going to be installed Land Technology Inc (LTI) removed the asphalt/concrete debris and excavated the trenches to the specifications contained in ATC's Interim Remediation Plan for the Farmer Property, 610 North Hunter Street, Stockton, California, dated October 24, 2001 The asphalt/concrete debris and excavated soil was transported under non- w lwordpro1625961reportsl1rp doc 4