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I supply well at the former Time Oil facility was abandoned in 1984. No other water wells were identified within a 2-mile radius of the Facility. Potential Receptors. Potential human receptors include those that may be exposed to petroleum hydrocarbons under the current or reasonably likely future land and water use scenarios. The following potential receptors were identified: (1) occupational workers; (2) construction workers; and (3) excavation workers. Occupational workers are assumed to be exposed to surface soil (0 to 2 feet bgs). Construction and excavation workers are assumed to be exposed to soil from 0 to 15 feet bgs and groundwater. Potentially Complete Exposure Pathways. Potentially complete exposure pathways are listed below. • Current and Future Direct Contact of Soil.- This pathway is complete for current or future excavation and/or construction workers at the Facility because residual petroleum hydrocarbons may be present in near surface soil (i.e., upper 3 to 4 feet), and near subsurface utilities in the AST 3302 area. If AST 3302 was removed in the future, residual hydrocarbons could be present in the near surface soil in the AST footprint. However, workers at the Facility are trained in the appropriate handling of petroleum hydrocarbons and standard operating procedures to mitigate the current potential risk presented by the potentially present residual hydrocarbons. • Direct Contact of Groundwater.- Direct contact of groundwater during construction and/or excavation activities is possible at the Facility. Therefore, this pathway is considered potentially complete for construction and excavation workers under current or future land use. Incomplete Exposure Pathways. Incomplete pathways are discussed below. • Vapor Intrusion into Buildin4s This pathway is not considered complete for current or future workers because: (1) Facility buildings are located upgradient and outside of the extent of petroleum hydrocarbon concentrations in soil and groundwater; and (2) hydrogeologic conditions are not expected to change in the future. • Terrestrial Receptors. Dissolved-phase petroleum hydrocarbons in soil that may be accessible to terrestrial receptors are limited to the AST 3302 area at the Facility. The Facility is an active bulk terminal and does not provide suitable habitat for terrestrial receptors. Therefore this pathway is incomplete. • Aquatic Receptors. The nearest surface water body is an un-named canal located approximately 1/4 mile to the west and hydraulically up-and cross-gradient of the Facility. Therefore this pathway is incomplete. • Agricultural or Domestic Groundwater Use. One agricultural irrigation water well (No. 01N06E08R002M) was identified approximately 1.5 miles to the southeast at a private property along the northern side of Charter Way. Water level data were collected from the well until 1994 and the current status of the well is unknown. The nearest municipal water well was Revised Cleanup Plan Page 15 NuStar Stockton Terminal-Stockton,California November 7,2012 1014-12