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Former Discovery Chevr� January 27, 1998 <br /> Tract California Additionalubsurface Investigation Work Plan <br /> The scope of work described in this work plan is intended to comply with the State of <br /> California Water Resources Control Board's Leaking Underground Fuel Tanks (LUFT) <br /> Manual, and the Regional Water Quality Control Board's Tri-Regional Board Staff <br /> Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites. <br /> Horizon Environmental Inc. Field Methods and Procedures are included in Appendix B of <br /> this Work Plan. <br /> SITE DESCRIPTION AND BACKGROUND <br /> The subject site is a former automobile dealership located at 1615 11th Street in Tracy, <br /> California. The site is located adjacent to the Southern Pacific railroad tracks, and <br /> approximately 0.2 mile north of the Lower Main Canal (Figure 1). The elevation of the site <br /> is approximately 44 feet above mean sea level (MSL). The site is owned by Thomas Nokes <br /> and was formerly occupied by Discovery Chevrolet and most recently by Tracy Chevrolet. <br /> Currently the site is unoccupied. Site facilities include an auto showroom, a sales office, and <br /> service bays. We understand from information provided in previous reports that two 500- <br /> gallon gasoline (USTs were removed from a common excavation at the site in April 1993, <br /> and that no USTs are known to remain at the site (GeoStrategies Inc., December 7, 1994, <br /> Preliminary Environmental Investigation and Evaluation Report for Former Discovery <br /> Chevrolet, 1615 11th Street, Tracy, California). Locations of these facilities and other <br /> pertinent site features are shown on the Site Plan (Figure 2). <br /> GeoStrategies (December 7, 1994) indicated that when the two gasoline USTs were <br /> removed, four soil samples were collected from the base of the excavation at depths of <br /> approximately 9 to 10 feet. These samples were found to contain total petroleum <br /> hydrocarbons as gasoline (TPHg) at concentrations ranging from 920 to 4,400 parts per <br /> million (ppm), as shown on Table I from the GeoStrategies report, included in Appendix C. <br /> Groundwater was not encountered in the tank excavation. In addition, a sample was <br /> 3001-13.wp 2 HORIZON ENVIRONMENTAL INC. <br />