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IPA, <br /> E11;244 Pyrites Way•Gold River(A 95670 <br /> E v°i R 0 T E C N ,I. `C Phone 91 b:851.0174 Fox 91'5 85,1.0177'• loll Free 18Q0.242.5249' <br /> November 12, 2009 <br /> Mr.Nuel Henderson <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, 3ra floor _ <br /> Stockton,•California 95201 <br /> Subject: Confirmation Soil Vapor Survey Workplan <br /> Moore Petroleum Bulk.Plant <br /> 5491 F Street,Banta, California <br /> Apex Project No. ERA02.004 <br /> Dear Mr. Henderson: <br /> Apex Envirotech, Inc. (Apex)has been authorized by Moore Petroleum(Moore)to provide this <br /> soil vapor survey(SVS)workplan to confirm the results of the previous SVS conducted on <br /> October 31, 2007. 'This workplan was.prepared in response to the San'Joaquin County <br /> Environmental Health Division (SJCEHD)letter dated July 2,2009 (Appendix A). All fieldwork <br /> will be conducted in accordance with the Apex standard operating procedures (SOP), 'included as <br /> Appendix B. <br /> BACKGROUND <br /> January 14, 1994—Apex began work on this project with groundwater monitoring. Prior to <br /> Apex,work conducted at the site included,subsurface investigations and groundwater monitoring <br /> by Earth Treatment Systems, Inc. of Manteca, California; Delta Environmental.Consultants„Inca <br /> of Rancho Cordova, California; Nations:Groundwater Associates of Sacramento,California;and <br /> Aegis Environmental,Inc. (Aegis)of Roseville, California. Site.details may be found in Aegis's <br /> Quarterly Groundwater Monitoring Report, dated April 18, 1991, which was submitted to <br /> Moore. <br /> May 5, 1995—A soil vapor extraction(SVE) system consisting of an RS:I. SAVE®system was <br /> installed at the subject site. The SVE,systein'was installed per San Joaquin Valley Unified Air <br /> Pollution Control District(District)permit:conditions. The SVE system corisisted`of an internal <br /> combustion engine with catalytic converters mounted on.the exhaust.- The SVE system was <br /> configured to allow soil vapors to be extracted from either vapor well•VEW-1 and/or monitoring <br /> well MW-l L. The SVE system was started on May 5, 1995,' and operated through October 4, <br />