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ehi r`y1Gi.'.Ild i I !`il t,,1_1 Ii <br /> ////7APIEX 04 AN —7 PM 4' 201244 Pyrites Way•.GoldRiver,CA.95670 <br /> E N V I R 0 T E C H , I N C . Phone 916.851.0174• Fax 916.851.0177 Toll Free 1.800.242.5249 <br /> June 2, 2004 <br /> ell <br /> Ms. Dc;t Lofstrom <br /> San Joaquin County Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, California 95201 - <br /> Subject: Workplan Addendum Letter for a Limited Subsurface Site Investigation <br /> Moore Petroleum Bulk Plant <br /> 5491 F Street, Banta, California <br /> Apex Project# ERA02.004 " <br /> Dear Ms. Lofstrom: <br /> Apex Envirotech, Inc. (Apex) has been authorized by Moore Petroleum (Moore) to submit this <br /> Workplan.Addendum in response to the San Joaquin County Environmental Health Department <br /> (SJCEHD) letter dated May 12, 2004 regarding the above referenced site (Figure l). <br /> This Workplan Addendum has been developed, in part, on the basis of information provided to <br /> Apex by Moore and obtained in f le.reviews and is subject to modification as newly acquired <br /> information may warrant. <br /> BACKGROUND <br /> On January 14, 1994 Apex began monitoring groundwater at the above site. Prior to Apex, work <br /> conducted at the site included subsurface investigations and groundwater.monitoring by Earth <br /> Treatment Systems, Inc., of Manteca, California; Delta Environmental Consultants, Inc., of <br /> Rancho Cordova, California; Nations Groundwater Associates of Sacramento, California; and <br /> Aegis Environmental, Inc. (Aegis), of Roseville, California. Site details may be found in the <br /> report titled, Quarterly Groundwater Monitoring Report, dated April 18, 1991, submitted to <br /> Jerry Moore by Aegis. <br /> On May 5, 1995, a soil vapor extraction (SVE) system consisting of an R.S.I. SAVE system was <br /> installed at the subject site. The SVE system was installed per San Joaquin Valley Unified Air <br /> Pollution Control District (SJVUAPCD) permit conditions. The SVE system consisted of an <br /> internal combustion engine with catalytic converters mounted on the exhaust. The system was <br /> configured such that soil vapors could be extracted from either vapor well VEW-1 and/or <br /> i i <br />