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Fourth Quarter 2004 Remediation Status Report Moore Petroleum Bulk Plant,5491 F Street,Banta,California Page 2 May 31, 1995 -An air sparge system was installed and started. The air sparge system operated intermittently through August 30, 1995, at which time its operation began to coincide with the operation of the R.S.I. system. The air sparge system consisted of a one horsepower electric motor which powers a 10-cubic feet per minute (cfm) oil-less compressor. The compressor injected air through an air sparge point located midway between V-EW-1 and MW-1. April 29, 1997 - Apex received permission from the San Joaquin County Environmental Health Division(SJCEHD) to shut down the air sparge and vapor extraction system due to low influent soil vapor concentrations to the vapor extraction system. As of April 29, 1997, the remediation system had extracted a total of 1,730 pounds of total petroleum hydrocarbons, as gasoline (TPHg), and 19.9 pounds of benzene. August 6, 1999 - Apex submitted a workplan titled, Workplan for Limited Subsurface Investigation, proposing the installation of four additional groundwater monitoring wells (MW- 4A, MW-7, MW-8, and MW-9). During installation, well MW-8 was installed with the screen and filter pack extending well into the unsaturated zone for possible future use as a vapor extraction well. In addition, underground piping was installed from well MW-8 (VEW-3) to the former remediation compound (Figure 2). November 17, 2000-Apex submitted the workplan titled, Workplan for Interim Remediation & fourth Quarter 2000 Groundwater Monitoring Report, proposing the installation of three recovery wells and one vapor extraction well, using the three recovery wells for a pumping test. SJCEHD responded and only wanted one recovery well installed for the pumping test and depending on the results, more recovery wells could be installed. January 8, 2001 - Apex supervised the installation of one vapor extraction well (VEW-2) and one groundwater recovery well (RW-2). Results of the well installation are documented in the report titled,Results Report for Limited Subsurface Investigation and First Quarter 2001 Groundwater Monitoring Report, dated March 9, 2001. March 2001 - Apex performed a pumping test utilizing well RW-2. The results of the pumping test were reported in Apex's Second Quarter 2001 Monitoring Report and Interim Remediation Plan, dated June 1, 2001. August 24, 2001 -Apex over drilled and reinstalled well MW-7 as a vapor extraction well. On September 12, 2001, Apex personnel installed the remediation piping connecting wells MW-7 (newly designated VEW-4/MW-7), VEW-2, and VEW-3 (VEW-3/MW-8) to the remediation compound. June 2002 - Construction and assembly of the vapor extraction system was completed. The official start-up of the system was on June 17, 2002 as reported in the Source Test Results Report, dated July 31, 2002, and a Remediation Status Report, dated October 4, 2002.