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//PAPEX . , E N V I R.0 E C H N C , 7844 Madison Avenue,Suite 10b 'Fir Oaks,CA 95628 1.800.2423249 • Ph.916335.0200 • Fax 916.535.0207 January 28, 1998 Mr. Jerry Moore Moore Petroleum, Inc. 5491 «F„ Street " Banta, California 95304 Subject: First Quarter 1998 Groundwater Monitoring Report- { Moore Petroleum,-Inc. 5491"F". Street, Banta, California' Apex Project No. ERA02.004 Dear Mr. Moore; . Apex Envirotech; Inc. (Apex), is pleased to provide Moore Petroleum Inc. (Moore Petroleum' this report documenting the results of the quarterly groundwater monitoring conducted on " i January 16 1998 at the.sub'ect site i reel The monitoring included collection of depth-to- s ry J {F gu ) g groundwater,measurements from monitoring wells MW-1 through MW-5, and groundwater samples from monitoring wells MW-1 and MW-4 located on site (Figure 2). This report is based, in part, on information obtained from Moore Petroleum, and is subject to modification as newly acquired information may warrant. f BACKGROUND . Apex began work on the 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 a"Quarterly Groundwater Monitoring Report," dated- April 18, 1991, submitted to Moore Petroleum 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 consists of an internal combustion engine with catalytic converters mounted on the