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WASTE DISCHARGE REQUIRE_ .11TS ORDER NO. 5 LINNE ESTATES,LLC LINNE ESTATES WASTEWATER TREATMENT SYSTEM SAN JOAQUIN COUNTY 29. All portions of the development and wastewater treatment facility are outside of the 100-year flood zone. 30. Stormwater that falls on the site is collected and discharged to a stormwater storage pond. 31. The site lies within the San Joaquin Delta Hydrologic Unit, as depicted on interagency hydrologic maps prepared by the Department of Water Resources in August 1986. 32. According to the Soil Conservation Service's Soil Survey of San Joaquin County, surface soil at the wastewater treatment facility consists of Stomar clay loam alluvium derived from sedimentary rocks. 33. The topography of the site and surrounding area is fairly level. Elevation of the site is approximately 110 feet above mean sea level. Basin Plan, Beneficial Uses, and Regulatory Considerations 34. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Edition, (hereafter Basin Plan) designates beneficial uses, establishes water quality objectives, contains implementation plans and policies for protecting waters of the basin, and incorporates by reference plans and policies adopted by the State Water Resources Control Board. Pursuant to Section 13263(a) of the CWC, waste discharge requirements must implement the Basin Plan. 35. Surface water drainage from the site is to the San Joaquin Delta. 36. The Basin Plan establishes numerical and narrative water quality objectives for surface water and groundwater within the basin. Numerical water quality objectives are maximum limits directly applicable to the protection of designated beneficial uses of the water. The Basin Plan requires that the Regional Board, on a case-by-case basis, follow specified procedures to determine maximum numerical limitations that apply the narrative objectives when it adopts waste discharge requirements. 37. The Basin Plan includes a water quality objective for Chemical Constituents that, at a minimum, requires waters designated as domestic or municipal supply to meet the maximum contaminant levels (MCLs) specified in the following provisions of Title 22, California Code of Regulations: Tables 64431-A (Inorganic Chemicals) and 64431-B (Fluoride) of Section 64431, Table 64444-A (Organic Chemicals) of Section 64444, Table 64449-A (Secondary Maximum Contaminant Levels-Consumer Acceptance Limits) of Section 64449, and 64449-B (Secondary Maximum Contaminant Levels-Ranges) of Section 64449. The Basin Plan's incorporation of these provisions by reference is prospective, and includes future changes to the incorporated provisions as the changes take effect. The Basin Plan recognizes that that the Regional Board may apply limits more stringent than MCLs to ensure that waters do not contain chemical constituents in concentrations that adversely affect beneficial uses. W:\SUWbrimTlSa Jwquintlimc Fsutm\innc WDR rl.dm