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Preliminary Investigation And Evaluation Report - December 1998 Mel Bokides Petroleum -'Manteca . 983 Moffat Boulevard, Manteca, California 1.0. INTRODUCTION At"-the request of Mr.Nick Bokides of Mel Bokides Petroleum(MBP),Advanced GeoEnvirorimerital, Inc. (AGE) has prepared this Preliminary Investigation and Evaluation Report (PIER) for the ' property located at 983 Moffat Boulevard, Manteca, California (site). The purpose of this site assessment is to evaluate the lateral and vertical extent.of petroleum hydrocarbon impacts to soil and groundwater at the site. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. Approximately 100 cubic yards of additional hydrocarbon-impacted soil were excavated in September, all soil generated from the tank'removal was disposal of soil at a licenced landfill, and six soil probe borings were advanced at the site in December 1998. ' This report is prepared in accordance with guidelines established by the Central Valley Regional Water Quality Control Board(CVRWQCB)and by the San Joaquin County Public Health Services- Environmental Health Division (PHS-EHD) related .the subsurface investigation of the former underground storage tank (UST) system on.the site. 2.0. BACKGROUND ' . The site is located in a business/agricultural area of eastern Manteca, California, in San Joaquin County (Figure 1). The property currently is being constructed as a gasoline station. The site is ' located at the intersection of Moffat Boulevard and Cowell Avenue, in an area of low topographic relief, at an elevation of approximately 48 feet above mean sea level (Manteca Quadrangle; 7.5- Minute USGS Topographic Series, 1968, photo revised 1976). 2.1. UNDER GROUND STORAGE TANK REMOVAL 000- On 10 September 1998, four USTs, Including.two 3,000-gallongasoline-USTs one 4 gallon gasoline UST and one 12,000-gallon diesel UST, and two dispenser islands and associated product lines were removed from the site. These tanks were in operation at the site for approximately twenty years. The locations of these features are depicted on Figure 2. During the removal of the USTs and fueling system, approximately 350 cubic yards of soil were removed from two UST excavations and four dispenser excavations:Excavated soil was stockpiled 1 on the eastern end of the site. Soil samples were collected from the stockpiled soil and submitted for laboratory analysis. ; Advanced Geo£nvironmental,Inc.