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Executive Summary The Remediation, Closure and Technical Services (RCTS) Branch of the California Integrated Waste Management Board(CIWMB)was requested by the San Joaquin County Local Enforcement Agency(LEA)to perform a site investigation of the Santa Fe Road Disposal Site (Site). The investigation included a Phase I, Office Investigation, and a Phase II, Field Investigation. The objective of the investigation was to 1) verify ownership of all parcels of property involved 2) to determine the horizontal and vertical extent(volume estimate) of the waste by intrusive investigation, 3)to characterize the waste via sampling of the wastes and soil and conducting a laboratory analysis of the samples and 4) to determine the conditions of the Site with regard to applicable California Code of Regulations, Title 27, Sections 20530, 20650, and 20820 for: Site Security, Cover, and Drainage and Erosion Control, respectively. CIWMB RCTS staff working with its contractor Ninyo and Moore developed a Work Plan, which detailed the trenching and sampling requirements. The investigation occurred October 21- 24, 2002. Seventy trenches were dug to determine the volume of waste within the Site and samples were taken from each trench. The samples were provided to xce em a ora ory for ana ysis. T e data from trenc ing, sampling and laboratory analysis was compiled and evaluated. This report contains the data and its evaluation and includes the Findings and Recommendations for each parcel of property involved, as well as a Finding and Recommendation for the overall Site. Waste areas were identified on all properties Delta(Lynch), Waller(McAnaly), Beard, and Beard(Lane). Maps depicting the waste areas for debris and bum ash are located in Aendix ®H. Based upon data developed from trenching activities the approximate volume of waste was estimated at 130,000 cubic yards. The southern most property belonging to Beard contained small amounts of waste (less than 3000 cubic yards. The Delta and Waller properties appear to have a continuous disposal area that may underlie Santa Fe Road(Aerial photos and site historical documents suggest that the Snyder Sanitary Dump predates the construction of Santa Fe Road). The Beard(Lane)property contains a well-defined mass of waste adjacent to the railroad berm and buried disposal area that is shared with the Delta property. Trenching also verified the site's history as a sand mining quarry. Trench data indicates that large portions of the quarry were filled with native soils,presumably excavation soils from mining. Characterization of soil and waste samples from trenching indicates that some "hot spots"exist (Arsenic was detected at 120,000 mg/kg in one sample). In general the waste is non-hazardous in nature and statistical analysis of chemical constituency data supports that the majority of samples analyzed contained levels below designated thresholds: lead content, a primary concern for waste classification, was analyzed at less than 1000 mg/kg total threshold concentration limit(TTLC) value and also below the established 350 mg/kg standard set for disposal. Based upon the results of the investigation,the RCTS staff concludes that the properties and overall site conditions for Cover, Drainage and Erosion Control fail to meet State Minimum Standards. All properties were monitored for gas during the trenching activities. Instruments were used to detect combustible gas conditions (GMI Gas Surveyor 422) and the presence of organic vapors (Photo-ionization Detector). No significant levels of gas were found during trenching activities. Three of the four properties failed the Standard for Site Security. Therefore, the overall site conditions indicate that the Santa Fe Road Disposal Site poses a threat to public health and safety, and the environment.