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Confirmation Soil Vapor Survey Workplan Moore Petroleum Bulk Plant,5491 F Street,Banta,California Page 4 August 16, 2004—In a.letter, the SJCEHD directed an addendum be made to the Workplan for a Limited Subsurface Site Investigation (dated January 14, 2004)in order to define the vertical . extent of contamination. Apex submitted a Workplan Addendum Letter for a Limited Subsurface Investigation, dated June 2, 2004. September 2004—Apex installed and tested an SVE system with activated carbon adsorption as the control device. In addition, Apex installed an ozone generator system for eventual ozone sparging. Results from the SVE system startup were reported to the District in the letter Source Test Report, dated November 11, 2005. December 6 and 8, 2004—Apex supervised the drilling of nine ozone sparge wells (OS-2 through OS-10). Results of the ozone well installations are reported in Apex's Interim Results Report for Ozone Sparge Wells, dated March 4, 2005. The ozone system began full-time operation on February 17, 2005. October 31, 2005 —Apex supervised the installation of four groundwater monitoring wells (MW-13, MW-14, MW-16, and MW-17). Drilling and installation of MW-15 has been postponed until the receipt of Union Pacific Railroad's right-of-entry agreement. Results of the monitoring well installations reported are in Apex's Limited Subsurface Site Investigation Results Report, dated March 30, 2006. December 19,2006—Apex installed and started operation of a new ozone sparging system(H20 Engineering). April 11, 2007—The SJCEHD issued a letter approving the reduction of groundwater sampling in wells MW-5 and MW-6 to an annual basis. The SJCEHD also requested a site conceptual model (SCM), soil vapor survey workplan, ozone efficiency letter, and TPHmo definition letter be prepared. May 9, 2007—Apex submitted a Soil Vapor Survey Workplan to investigate the presence or absence of fugitive soil vapors in the shallow subsurface. May 16, 2007—Apex submitted a letter to the SJCEHD for defining.the suspected TPHmo plume discovered in borings CPT-1 and CPT-2. Apex suggested additional testing of the Rhodes water well for TPHd, TPHmo, and total petroleum hydrocarbons as kerosene (TPHk). Apex also suggested installing MW-15 to a depth of 100 feet below ground surface(bgs). The SJCEHD approved the additional testing but requested additional information before approving the installation change to well MW-15. May 24, 2007 Apex submitted a response letter to the SJCEHD providing justification for the current onsite ozone system. June 25, 2007—The SJCEHD issued a letter requesting clarification of the soil vapor survey on May 9, 2007. Apex submitted a Soil Vapor Survey Workplan Clarification, dated July 24, 2007, to address the SJECHD concerns.