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3.0 WATER QUALITY GOALS AND PROTECTION STANDARDS 3.1 Site Water Quality Goals and Protection Standards Site-specific numeric water quality goats are necessary to formulate final remedial objectives for the site Additionally, numeric water quality goals and protection standards are necessary to formalize creation of a Water Quality Limited Zone (WQLZ) within the context of State Water Resources Control Board resolutions Creation of a WQLZ is considered in thus document because remediation and investigative data obtained for the subject site suggest residual impact levels will remain after efficient use of the best available technologies has been exhausted It is well known that in most cases efficient use of physical remediation technolo- gies will not completely remove or reduce hydrocarbon impact within a reasonable period of time Since petroleum hydrocarbon impact is restricted to groundwater, and the nearest ' surface water (Yosemite Lake) is located at a significant distance from the site, only ground- water is considered here Guidance for developing water quality goals and protection standards was obtained from the Water Quality Control Plan, Central Valley Region, Sacramento and San Joaquin River Basins (Regional Water Quality Control Board - Central Valley Region, December 9, 1994), A Compilation of Water Quality Goals (Marshack, 1993), and State Board Resolu- tions 68-16, 88-63, and 92-49 (as amended on April 21, 1994) San Francisco Regional Water Quality Control Board Order 95-016 was also used for reference, a copy is presented as Appendix B The development of site-specific water quality goals and protection standards begins with identification of beneficial uses The existing and potential beneficial uses of groundwater underlying the site include + • municipal and domestic water supply, • agricultural supply, and • industrial process and service supply Comprehensive water quality standards are meant to protect the relevant beneficial uses of ground and surface water, water quality goals are used as benchmarks for water restoration To develop water quality goals and standards, it is recognized that working to restore or • 3201337B/1918REV 9 August 31, 1995