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Well Destruction Results Report r+ Moore Petroleum Bulk Plant,5491 `F'Street,Banta,California `� Page 5 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. V May 24, 2007—Apex submitted a response letter to the SJCEHD, providing justification for the current onsite ozone system. 1�1 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 SJCEHD's concerns. June 29, 2007—Apex issued a letter to the SJCEHD, suggesting that additional sampling be performed in the area around CPT-2 to confirm the presence of weed oil 30 feet bgs. Apex also recommended that proposed well MW-15 be installed to the original depth of 20 feet bgs. October 31, 2007—Apex advanced and sampled 13 soil vapor points at the subject site. Results of the soil vapor survey are documented in Apex's Soil Vapor Survey Results Report, dated December 12, 2007. March 12, 2008 —The SJCEHD issued a letter requesting a fate analysis of proposed sample analyte list(dinitro amyl phenol (DAP), dinitro butyl phenol (DBP), 2-sec, 4-butyl dinitrophenol (dinoseb), and pentachlorophenol (PCP). The SJCEHD also approved the installation of well MW-15 to the originally proposed depth of 20 feet bgs. May 6, 2008 —The SJCEHD issued a letter approving Apex's Sample Reduction Request Letter, dated January 23, 2008. The SJCEHD approved the following groundwater monitoring frequency: quarterly sampling of MW-3, MW-7, MW-8, MW-10, MW-11, VEW-2, and RW-2; semi-annual sampling of MW-4A and MW-12; and annual sampling of MW-2, MW-5, MW-6, MW-9, MW-13, MW-14, MW-16 and MW-17. August 18, 2008 —Apex installed monitoring well MW-15 to a total depth of 20 feet bgs. Apex submitted the results of the installation in a results report on December 8, 2008. April 30, 2009—Apex submitted a letter to the SJCEHD requesting that the analytical suite for r groundwater samples be reduced to include only total petroleum hydrocarbons as gasoline r r