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Results Report and First Quarter 2001 Groundwater Monitoring Report Moore Petroleum Bulk Plant,5491 F Street,Banta,California Page 3 i Apex submitted the Workplan for Limited Subsurface Investigation dated August 6, 1999, proposing the installation of four additional groundwater monitoring wells. Apex submitted the Workplan for Limited Subsurface Investigation dated April 27, 2000, proposing the installation of three additional groundwater monitoring wells and one deep soil boring. f On July 25 and 26, 2000 Apex personnel supervised the installation of three groundwater monitoring wells (MW-10, MW-11, and MW-12). The results of all soil and water sampling were documented in the report entitled Results Report for Limited Subsurface Investigation and Third Quarter 2000 Groundwater Monitoring Report dated August 25, 2000. 3 Apex submitted the Workplan for Interim Remediation & 4'h Quarter 2000 Groundwater .Monitoring Report dated November 17, 2000, proposing the installation of three remediation wells (RW) and one vapor extraction well (VEW), using the three RW wells for a pumping test. San Joaquin County Environmental Health responded and only wanted one remediation well installed for the pumping test and depending on the results, more RW's could be installed. i SUBSURFACE INVESTIGATION Well Installation r On January 8, 2001, Apex advanced two soil borings for the purpose of installing an interim remediation system at the site (Figure 3). VEW-2 was drilled as a four-inch diameter well to a depth of 20 feet below grade surface (bgs) with 15 feet of screen. RW-2 was drilled as a six-inch diameter well to a depth of 30 feet bgs with 20 feet of screen. The borings were drilled and constructed by Woodward Drilling, Inc. of Rio Vista, California according to the Apex Standard 1 Operating Procedure (SOP) included as Appendix A. Well construction details are included in Appendix B. a i s r �