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///APEX 1844 Madison Avenue,Suite 106 • Fair Oaks,CA 95628 E N V 1 R 0 T E C H , I N C . 1.800.242.5249 • Ph.916.53S.0200 • Fax 916.535.0201 October 9, 2001 Ms. Dot Lofstrom San Joaquin County Environmental Health Division P. O. Box 2009 Stockton, California 95201 Subject: Third Quarter 2001 Groundwater Monitoring Report Moore Petroleum Bulk Plant ,Q 5491 F Street, Banta, California Apex Project#ERA02.004 Dear Ms. Lofstrom: Apex Envirotech, Inc. (Apex), has been authorized by Moore Petroleum (Moore) to provide this report regarding quarterly groundwater monitoring conducted on July 17, 2001. The monitoring included collection of depth-to-water measurements and groundwater samples from monitoring wells MW-1, MW-2, MW-3, MW-4A, MW-5, MW-7 through MW-12, and vapor extraction well VEW-2, at the subject site (Figures 1 and 2). In addition,the domestic well at 5451 F Street was sampled. Recovery well RW-1 was not sampled and MW-6 could not be located and was not sampled this quarter. BACKGROUND Apex began work on this project with the groundwater monitoring conducted on January 14, 1994. Prior to Apex, work conducted at the site included subsurface investigations and groundwater monitoring by Earth Treatment Systems, Inc., of Manteca, California; Delta Environmental Consultants, Inc., of Rancho Cordova, California; Nations Groundwater Associates of Sacramento, California; and Aegis Environmental, Inc. (Aegis), of Roseville, California. Site details may be found in the Quarterly Groundwater Monitoring Report, dated April 18, 1991, submitted to Moore by Aegis. On May 5, 1995, a soil vapor extraction system consisting of an R.S.I. SAVE, system was installed at the subject site. The vapor extraction system was installed per San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) Permit conditions. The vapor extraction system consisted of an internal combustion engine with catalytic converters mounted on the exhaust. The system was configured such that soil vapors could be extracted from either vapor