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r OUARfERLY GROUNDWATER MONROFVN0 AND <br /> MON1`11DRIM WELL INSTALLATION REpoFrr <br /> 1399 East Yosemite Avenue Manteca,California <br /> 1.0 INTRODUCTION <br /> This report documents the results of quarterly groundwater monitoring conducted by <br /> Aegis Environmental, Inc (Aegis), at the Moore Petroleum, Inc (Moore Petroleum), <br /> service station located at 1399 East Yosemite Avenue in Manteca, California (Figure 1) <br /> The monitoring included the collection of depth-to-groundwater measurements and <br /> groundwater samples from the monitoring wells located on site (Figure 2) This report is <br /> based, in part, on information obtained by Aegis from Moore Petroleum and is subject to <br /> modification as newly acquired information may warrant <br /> 2.0 SITE DESCRIPTION <br /> The Yosemite Avenue Moore Petroleum Exxon service station is located on the northwest <br /> comer of the intersection of Northwoods Drive and East Yosemite Avenue, in a <br /> commercial area of eastern Manteca The site is bounded on the north by a small <br /> shopping complex, on the west by a fast food restaurant, on the south by East Yosemite <br /> Avenue, and on the east by Northwoods Drive Details of the site's current and former <br /> facilities, including previous and existing underground storage tanks (UST), were reported <br /> to Moore Petroleum by Aegis in a "Problem Assessment Report, Including Quarterly <br /> . Monitoring 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 Ines 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 /> 5IM98FOMA 1- <br />