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1.0 BACKGROUND In June 1996, under contract to Rajappan and Meyer, Inc. (R&M), Michael Brandman Associates completed an Initial Site Assessment (ISA) for the State Route (SR) 99/Jack Tone Road Reconstruction Project in the City of Ripon, California (Figure 1). The ISA concluded that the site required a Preliminary Site Investigation (PSI) of potential soil contamination in the vicinity of the interchange. Subsequently, R&M contracted URS Greiner, Inc. (URSG) to complete the PSI. This document outlines the approach URSG will use to perform the PSI soil sampling. 2.0 PROPOSED APPROACH AND SAMPLING 2.1 Objectives The objectives of the PSI are to determine whether: • subsurface contamination due to leaking underground storage tanks (USTs) exists at the Nelson Ready Mix site; • creosote contamination of the Southern Pacific Railroad (SPRR) track bed exists at 0 to 6 inches below ground surface (bgs); • surficial soils adjacent to the interchange have been contaminated by lead emissions from vehicle exhausts; and • pesticide contamination exists in surficial soils to the northeast and southwest of the interchange due to prior agricultural practices. 2.2 Soil Borings One 500-gallon gasoline UST and one approximately 4,000 gallon diesel UST were originally operated at the Nelson Ready Mix site (Figure 1). Based on a August 24, 1997 URSG phone interview with the property owner, Mr. Russell Nelson, the gasoline UST was abandoned in place over 10 years ago, and the diesel tank was removed in 1995. A phone call on August 24, 1997, to Mr. Ron Rowe of the San Joaquin County Department of Environmental Health (SJCDEH), revealed that SJCDEH had detected diesel contamination in the UST excavation pit, but no further investigation of this contamination has occurred. Mr. Rowe also mentioned that an abandoned septic system existed at the site, and the contents of the 500-gallon UST had never been confirmed. In addition, soils in the vicinity of the gasoline UST and septic system had not been investigated. According to the ISA, the approximate depth to groundwater at the Nelson site is 20 to 30 feet, and the approximate PSI Soil Sampling Plan Page 1 SR99/Jack Tone Koad Interchange Project