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A, Preliminary_ Investigation and Evaluation Report ! . BOB'S MUFFLER SHOP 466 Moffat Road,Manteca, California 1.0. , INTRODUCTION AND SCOPE OF WORK At the request of Mr. Tom Barbour,Advanced GeoEnvironmental, Inc. (AGE) has prepared this 'Preliminary Investigation and Evaluation Report (PIER) for Bob's Muffler Shop located at 466 Moffat Road, Manteca, California(site). The location of the site is illustrated in Figure 1; a site plan is shown in Figure 2. The scope of work included the.advancement of four soil probe borings to evaluate the Iateral and vertical extent of petroleum hydrocarbons in soil and ground water. This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD)and the Central Valley Regional Water Quality Control Board for investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The site is located south of Yosemite Avenue in southern San Joaquin County, in the'city of . Manteca. The site is located in an area of low topographic.relief. The site is within the northwest quarter of Section 4, Township 2 South, Range 7 East, Manteca Quadrangle. Review of depth to ground water maps published by the San Joaquin County Flood Control and Water Conservation District dating Fall 1997 indicates that ground water depths may have been as low as 25 feet below surface grade (bsg) near the site (Fall 1997). AGE has been informed that three underground storage tanks (USTs) were removed from the site in 1988, one 10,000-gallon regular gasoline UST (Tank No. 1), one 8,000-gallon unleaded gasoline UST (Tank No. 2) and one 550-gallon waste oil UST (Tank No. 3). During the UST removals, soil samples were collected from beneath the ends of each UST. The laboratory results'of analyses of samples indicate a petroleum hydrocarbon impact to soil in the former UST area. At the request of Mr. Tom Barbour, on behalf of Ms. Amelia Barbour,Advanced GeoEnvironmental, Inc. performed a preliminary site assessment to investigate the unauthorized release of petroleum hydrocarbons to soil and ground water at 466 Moffat Road, Manteca (site). 3.0. PROCEDURES Tasks and procedures for this investigation were completed by AGE personnel-, or under the • direction of AGE personnel, and were conducted under the supervision of a California Registered Advanced GeoEnvironmentai,Inc.