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Revised.Preliminary Investigation and Evaluation Report'- May 1999 " OLYMPIAN-Jimco Truck Plaza ' 22502 South Highway 99, Ripon, California 1.0. INTRODUCTION At the request of Mr. Rusty Firenze of the OLYMPIAN OIL COMPANY, Advanced GeoEnvironmental, Inc.'(AGE) has prepared the enclosed Revised Preliminary Investigation and Evaluation Report (PIER) for the Jimco Truck Stop, located at 22502 South Highway 99, Ripon, California (the site). 1 The scope of work included: establishment of 16 soil probe borings;two hydro-punch water borings; collection and analysis of soil and ground water samples; installation of five ground water monitoring wells; and collection of ground water samples from eight wells and preparation of this report of findings. The location of the site with respect to its surroundings is illustrated in Figure 1. Buildings and boring locations on the site are illustrated in Figure 2. This report is prepared in accordance with San Joaquin County Public 'Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board guidelines for subsurface investigations of underground storage tank (UST) sites. 2.0 SITE BACKGROUND AND UNDERGROUND STORAGE TANK REMOVAL The site has been occupied by the Jimco Truck Stop for approximately 30 years. A restaurant, truck ' wash, repair facility, tire shop and several administrative offices are located on the property. The ; present fueling facility consists of nine fuel islands,'one UST and several above-ground storage tanks (ASTs). Three ground water monitoring wells from the Ripon Farm Service`underground storage ; tank investigation are located on the site, wells MW-6, MW-7 and MW-8 are.depicted on Figure 2. Three USTs and associated product distribution system were removed from the site between July and ' September 1998. Details of the UST removals, associated product distribution system and soil sampling were reported in the Underground Storage Tank Removal Report, dated 22 September 1998,prepared by Grayland Environmental. Approximately 1,150 tons of hydrocarbon-impacted soil were excavated from the former UST area, the former dispenser areas, the former piping areas and. the new UST location. Petroleum hydrocarbons in soil were detected in the north end of the former gasoline UST and throughout the dispenser locations. Table 1 depicts the analytical results from the UST removal. 3.0. PROCEDURES The field activities were performed in accordance with Central Valley Regional.Water Quality Advanced GcoEnvironmental,Inc.