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' QUAR TU LY GROUNOWATER MONFrURNO AND <br /> MONMUNQ WELL INSTALLATION REPORT <br /> 1399 East Yosemite Avenue Manteca,CalRomia <br /> 1.0 INTRODUCTION <br /> ' This report documents the installation of monitoring well MW-6 and the results of quarterly <br /> groundwater monitoring conducted by Aegis Environmental, Inc. (Aegis), at the Moore <br /> ' Petroleum, Inc. (Moore Petroleum), service station located at 1399 East Yosemite Avenue <br /> in Manteca, California (Figure 1) The monitoring included the collection of <br /> depth-to-groundwater measurements and groundwater samples from the monitoring wells, <br /> ' located on site (Figure 2). This report is based, in part, on information obtained by Aegis <br /> from Moore Petroleum and is subject to modification as newly acquired information may <br /> warrant <br /> ' 2.0 SITE DESCRIPTION <br /> The Yosemite Avenue Moore Petroleum Exxon service station is located on the northwest <br /> corner of the intersection of Northwoods and East Yosemite Avenues, in a commercial <br /> ' area of eastern Manteca. The site is bounded on the north by a small shopping complex, <br /> on the west by a fast food restaurant, on the south by East Yosemite Avenue, and on the <br /> ' east by Northwoods Avenue Details of the site's current and former facilites, including <br /> previous and existing underground storage tanks (UST), were reported to Moore <br /> Petroleum by Aegis in a "Problem Assessment Report, Including Quarterly Monitoring <br /> Report," dated November 12, 1991 <br /> ' 3.0 BACKGROUND <br /> In August 1988, Earth Treatment Systems of Merced, California, drilled four soil borings <br /> (SB-1 through SB-4) on site. One boring (SB-4) was completed as a 2-inch-diameter <br /> monitoring well MW-1, to approximately 36 5 feet below surface <br /> In April 1989, Delta Environmental Consultants, Inc , of Rancho Cordova, California, drilled <br /> and installed 2-inch diameter wells MW-2 and MW-3, to an approximate depth of 36.5 feet <br /> each <br /> On September 26, 1989, three UST and associated product Imes were removed. <br /> ' In June 1990, Nations Groundwater Associates of Sacramento, California, supervised the <br /> abandonment of MW-1 The well had been damaged during the removal of the UST in <br /> September 1989 Monitoring well MW-1A was then drilled and installed approximately <br /> 10 feet east of the former location of MW-1, and was completed as a 2-inch-diameter well <br /> to a depth of approximately 36.5 feet <br /> 110 <br /> 90-ME QMR <br />