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OVAR7ERLY GROUNDWATER MONITORING REPORT <br /> 399 East Yosemite Avenue Manteca Cahicrnia <br /> i 1 <br /> i 1.0 INTRODUCTION <br /> This report documents the results of groundwater monitoring conducted by Aegis <br /> Environmental, Inc (Aegis), from April through July 1992, at the Moore Petroleum, Inc <br /> ' (Moore Petroleum), service station located at 1399 East Yosemite Avenue in Manteca, <br /> California (Figure 1) The monitoring included the collection of monthly <br /> depth-to-groundwater measurements and quarterly groundwater samples from five <br /> monitoring wells, MW-113, MW-2, MW-3, MW-4, and MW-5, located on site (Figure 2) <br /> This report is based, in part, on information obtained by Aegis from Moore Petroleum and <br /> is subject to modification as newly acquired information may warrant <br /> 2 0 SITE DESCRIPTION <br /> The Yosemite Avenue Moore Petroleum service station is located on the northwest corner <br /> of the intersection of Northwoods and East Yosemite Avenues, in a commercial area of <br /> reastern Manteca The site is bounded on the north by a small shopping complex, on the <br /> west by a fast food restaurant, on the south by East Yosemite Avenue, and on the east <br /> by Northwoods Avenue Details of the site's current and former facilities, including <br /> previous and existing underground storage tanks (UST), were reported by Aegis in a <br /> "Problem Assessment Report, Including Quarterly Monitoring Report," dated <br /> 1� November 12, 1991 <br /> 30 BACKGROUND <br /> In August 1988, Earth Treatment Systems of Merced, California, drilled four soil borings <br /> 1 (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 wells MW-2 and MW-3 with 2-inch-diameter casing to an approximate depth <br /> of 36 5 feet each On September 26, 1989, three UST and associated product lines were <br /> Z� 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 /> ' S0-098B OMR <br />