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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -4- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY <br /> <br /> 15. 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. <br />16. The beneficial uses of the San Joaquin River (between Sack Dam and the mouth of the Merced River) are municipal and domestic supply; agricultural supply; industrial process supply; water contact recreation; non-contact water recreation; warm freshwater habitat; migration of aquatic organisms; spawning, reproduction and/or early development; and wildlife habitat. 17. The site receives an average of 16.5 inches per year of precipitation as determined from Rainfall Depth Duration Frequency data provided by the State Department of Water Resources for the Linn Ranch Station about two miles north of the site. The 100-year, 24-hour precipitation event for this station is 3.3 inches. The estimated mean Class A pan evaporation rate is about 65 inches per year. 18. Storm water run-on is diverted around the site by means of a perimeter berm and outboard ditch within a 100-foot setback from the site boundary. Some landfill runoff is also captured in the ditch. Storm water discharge locations at the site include two outfalls from the landfill perimeter ditch to the wetlands mitigation area and (via culvert) South Paddy Creek, one on the eastern side of the site near the NE corner of future Module 11, and the other on the western side of the site near the NW corner of existing Module 1. Two other (inactive) culverts along the perimeter ditch are planned as future storm water discharge locations as the landfill is developed. See Attachment B: Site Map. Storm water discharges to South Paddy Creek are monitored under the General Industrial Storm Water Permit. 19. Runoff from existing landfill modules and undeveloped areas of the unit is directed via onsite ditches to an interim sedimentation basin (ISB) in the northeast part of the site. Water collected in module excavation areas and other low spots is pumped into ISB drainage system. See Finding 54. The ISB includes an overflow pipe that, during periods of heavy precipitation, discharges via culvert to the outboard drainage ditch. The remaining water in the ISB dissipates through percolation, evaporation, and/or use in site operations (e.g., dust control). 20. All landfill drainage facilities, including overside drains, perimeter ditches, culverts, and the ISB were designed to handle a 24-hour, 100-year storm event. See Finding 53.