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APEX - 5330 Primrose Drive,Suite 100•Fair Oaks,CA 95628 <br /> Phone:916.535.0200 9 Fax:916.535.0207 <br /> E N 11 I R 0 T E C H INC .- <br /> httpltwww.apexenvirotech.com <br /> April 26, 2002 <br /> Ms. Dot Lofstrom <br /> San Joaquin County Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, California 95201 <br /> Subject: First Quarter 2002 Groundwater Monitoring Report <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 provide this <br /> report regarding quarterly groundwater monitoring conducted on February 11, 2002. The <br /> monitoring included collection of depth-to-water measurements and groundwater samples from <br /> monitoring wells MW-1 through`MW-5, MW-7 through MW-12; recovery well RW-2, and <br /> vapor extraction well VEW-2, at the subject site(Figures 1 and 2). In addition,the domestic well <br /> at 5451 F Street was sampled monthly during the quarter. MW-6 could not be located and was <br /> not sampled this quarter. <br /> BACKGROUND <br /> Apex began work on this project with the groundwater monitoring conducted on January 14, <br /> 1994. Prior to Apex; work conducted at the site_ included subsurface investigations and <br /> groundwater monitoring by Earth Treatment Systems, Inc.,,of Manteca, California; Delta <br /> Environmental Consultants, Inc., of Rancho Cordova, California; Nations_ Groundwater <br /> Associates of Sacramento, California; and Aegis Environmental, Inc. (Aegis), of Roseville, <br /> California. Site details may be found in the Quarterly Groundwater Monitoring Report, dated <br /> April 18, 1991, submitted to Moore by Aegis. <br /> On May 5, 1995, a soil vapor extraction system consisting of.an R.S.I. SAVE system was <br /> installed at the subject site. The vapor extraction system was installed per San Joaquin Valley <br /> Unified Air Pollution Control District (SJVUAPCD) Permit conditions. The vapor extraction <br /> system consisted of an internal combustion engine with catalytic converters mounted on the <br /> exhaust. The system was configured such that soil vapors could be extracted from either vapor <br />