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WASTE DISCHARGE REQUIREMLNTS ORDER NO.R5-2003-0178 _6_ MORADA PRODUCE COMPANY LINDEN PACKING SHED SAN JOAQUIN COUNTY i 31. The land application areas are located outside the 100-year flood zone. 32. The average annual total precipitation for this area of San Joaquin County is 15.28 inches. The 100-year annual total precipitation for this area is 26.65 inches. The peak monthly 100-year precipitation of 5.82 inches occurs in January. 33. Soil borings were drilled at the facility in September 2001 for a geotechnical investigation and in November 2001 as part of the RWD preparation. The boring logs describe subsurface soil as sand, silt, and clay mixtures. The deepest borings were drilled in November 2001 to 46.5 feet below the ground surface. No groundwater was encountered in any of the borings. 34. Surface soil in the land application area consists of Hollenbeck Silty Clay. The surface soil possesses a low infiltration rate(0.06 to 0.2 in/hr). BASIN PLAN, BENEFICIAL USES,AND REGULATORY CONSIDERATIONS 35. 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 California Water Code,waste discharge requirements must implement the Basin Plan. 36. Surface water drainage is to Mormon Slough, a tributary of the Calaveras River. 37. The beneficial uses of the Calaveras River(from New Hogan Reservoir to the Sacramento San Joaquin Delta) are municipal and domestic supply; agricultural supply; industrial process and service supply; water contact recreation; non-contact water recreation; warm freshwater habitat; cold freshwater habitat; migration of aquatic organisms; spawning, reproduction, and/or early development; and wildlife habitat. 38. The beneficial uses of underlying groundwater are municipal and domestic supply, agricultural supply, industrial service supply, and industrial process supply. 39. State Water Resources Control Board (State Board)Resolution No. 68-16 requires that the Regional Board, in regulating the discharge of waste,must maintain high quality waters of the state until it is demonstrated that any change in quality will be consistent with maximum benefit to the people of the State, will not unreasonably affect beneficial uses, and will not result in water quality less than that described in the State Board's policies (e.g., quality that exceeds water quality objectives). Resolution 68-16 also requires that the discharge be required to meet waste discharge requirements which will result in the Best Practicable Treatment or Control (BPTC) of the discharge to assure that pollution or nuisance will not occur and the highest water quality consistent with the maximum benefit to the people of the State be maintained. 40. The Regional Board has considered antidegradation pursuant to State Board Resolution No. 68-16 and finds that not enough data exists to determine whether this discharge is consistent with those