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%W CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 91-217 WASTE DISCHARGE REQUIREMENTS FOR BROWN SAND INC. MOSSDALE ASSOCIATES, LTD. MOSSDALE RANCH AGGREGATE SAND EXCAVATION AND PLANT SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1 . Brown Sand Inc. and Mossdale Associates Ltd. (hereafter Discharger) submitted a Report of Waste Discharge, dated 8 August 1991, for a new aggregate sand excavation and processing plant. The site is on Assessor's Parcel Nos. 293-030-001 and 293-030-008 and is owned by Mossdale Associates, Ltd. The site will be operated by Brown Sand Inc. 2. The Discharger proposes to discharge up to 3.6 million gallons per day of wastewater from sand washing operations to a sedimentation/recycle pond. A coagulant and flocculant will be added to the discharge to increase the settleability of the fines in the pond. 3. The excavation and plant are in portions of Sections 3, 4, 9, and 10, T2S, R6E, MDB&M with surface water drainage to the San Joaquin River, as shown on Attachment A, incorporated herein and made part of this Order. 4. The beneficial uses of the San Joaquin River are municipal , industrial , and agricultural supply; stock watering; navigation; recreation; esthetic enjoyment; and preservation and enhancement of fish, wildlife, and other aquatic resources. 5. The beneficial uses of the ground water are municipal , industrial , and agricultural supply. SITE OPERATION 6. The Discharger will be excavating and anticipated 400,000 cubic yards per year of near surface sand deposits from approximately 185.5 acres of the 303 acre site. The property lies within a MRZ-2 classification assigned by the California Department of Geology due to the significant aggregate deposits present. The surface soils and sediments which lie above the water table will excavated using a five-yard loader, an excavator and a caterpillar tractor. Excavated material will be loaded into rubber-tired scrapers and delivered to the plant. Below the water table a bucket type dredge will be utilized to excavate sands to a depth of 55-60 below ground surface. The dredge will float on the surface of the dredge pond and deliver the dredged sand to a washing and screening plant via a floating conveyor belt or a slurry pipeline. No dewatering of the excavation site will be necessary.