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Stockton Cineplex Site Work plan for Preliminary Risk Assessment and Contaminant Mitigation Page: 2 chemical and toxic nature of potential contaminates of concern will be determined and the behavior of the contaminants in the air, soil, and groundwater estimated. The extent of the migration of potential contaminates is partially a function of the concentration and magnitude of the release. Potential receptors in the vicinity of the Stockton Cineplex will be identified and the possible impact of contaminates of concern evaluated. The potential migration of contaminates through vapor migration, soil leaching, and groundwater ingestion and transport will be evaluated. Potential exposure routes that could allow for contamination to impact health and the environment will be identified. Acceptable contaminant concentrations in source areas that would not pose a threat to health and safety at points of possible exposure will be estimated. The impact of the potential exposures will be calculated in terms of risk, based on type and lengths of possible exposures and established regulation and policy. . The risk assessment evaluates the projected risk against acceptable levels of risk as established by government and health and safety organizations. Vapor exposure risks are based on exposures levels (PEL / TLV) established by Occupational Health and Safety Organizations and state and federal law. Dermal and ingestion exposure levels are based on toxicity risks for specific contaminants. Groundwater exposure levels are based on maximum contaminate levels and water quality goals established by state and federal law. 1.1 Site Description and History A Phase I Environmental Assessment of the Stockton Cineplex site by M.J. Kloberdanz & Associates disclosed that the city block bound by East Miner Avenue to the north, North Hunter Street to the East, Channel Street to the south, and North Dorado Street to the west has historically been occupied by automobile repair service facilities and garages, laundering facilities, and print shops, from the 1900s to the 1980s. Historical use of underground tanks at several locations, evidence of former automotive service businesses, the presence of printing and dye facilities, and a coal yard were documented A Sanborn fire insurance map, dated 1917, also indicates the presence of underground tanks along North Hunter Street, Channel Avenue, and North El Dorado Street. A 450- gallon gasoline UST is depicted along North Hunter Street (approximately 75 feet north of East Channel Avenue), a 450-gallon gasoline UST is depicted along East Channel Avenue, (approximately 75 feet west of North Hunter Street, a 400-gallon gasoline UST is depicted along North El Dorado Street, (approximately 70 feet north of East Channel Street), and a 400-gallon gasoline UST is depicted along North El Dorado Street, (approximately 130 feet south of East Miner Avenue). Laundries that may have been involved dry cleaning solvents were also located on the site (Figure 3). M.J. Kloberdanz & Associates inspected the property and noted other locations of possible concern including plates in the sidewalk labeled gas and capped pipes in traffic boxes. In order to extend the level of due diligence, soil and groundwater sampling in various locations was conducted. A Geoprobe"`, direct push technology, was used to obtain soil and water samples to help determine if contaminants,