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IF, There are two agricultural wells on MacArthur Drive, 0.5 mi N of the Site, and 100 ft NE of the site. Both are downgradient of the site. There are two mobile home residences approximately 600 feet NE of the site. There is a residential subdivision 1.5 mi N on MacArthur. There is one residence to the south. The project applicant is proposing to develop a well (or wells) on the site for the provision of water for human consumption, fire protection, and wash -down use in the transfer and recycling facility. Condor Earth Technologies, Inc. has completed a Water Well Survey for a two-mile radius of the site. This survey is included in the appendix to this document. The Environmental Site Assessment of Assessor Parcel number 253-130-19 (EBA, 1993), completed by EBA Wastechnologies in February, 1993 cites a number of potential sources of ground water contamination in the vicinity of the site. There are two sites, RMC Lonestar Industries located at 30350 S. Tracy Boulevard and Teichert Aggregates' Tracy Rock Plant located at 29099 S. MacArthur Drive, undergoing investigation for toxic or hazardous substances releases. Both sites lie within a one mile radius of the project site. Both sites apparently have leaking underground storage tank problems. However, local ground water flows towards the north, away from the project site. The SF Royster Tire Disposal, a 52 -acre tire landfill located at 29425 MacArthur Drive, although not mentioned in the site assessment report, is considered to be a potential source of migrating contamination. ENVIRONMENTAL IMPACTS AND MITIGATION MEASURES I This section identifies and discusses the potentially significant environmental impacts to water resources which result from the development and operation of the Tracy Materials Recovery and Transfer Facility. The analysis has been formulated on the basis of available information, using reasonable projections of the worst case consequences. For the purposes of this section, an environmental impact is defined as a change in the status of the existing physical conditions that would be affected by the proposed action or alternative. The effects can be direct (primary), which are caused by the project and occur at the same time and place, or indirect (secondary), which are caused by the project and are later in time or farther removed in distance, but are still reasonably foreseeable. Specific, detailed mitigation measures are proposed and described for all potentially significant environmental impacts. Where there is no feasible mitigation identifiable, or where proposed mitigation measures do not reduce the impact to a level of less -than -significant, the impact is considered to be a significant, unavoidable, adverse impact. Significance Criteria The California Environmental Quality Act (CEQA), Supplementary Document G, states that "A project will normally have a significant effect on the environment if it will: conflict with adopted environmental plans and goals of the community where it is located; substantially degrade water quality; contaminate a public water supply; substantially degrade or deplete ground water resources; interfere substantially with ground water recharge; or cause substantial flooding, erosion, or siltation. Impacts would be considered significant if they could result in one or more of the following conditions: Degrade surface water quality, thereby affecting downstream use(s). I Degrade ground water quality such that other existing and proposed uses of the resource in the project area would be affected; or exceeclance of threshold criteria as set forth in water quality protection standards. Withdraw significant water quantities from an aquifer which is already in overdraft. ER -93-1 - 67 - (9-27-93) 1