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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDERNO. 5-0.1-145 r - WASTE DISCHARGE REQUIREMENTS } EOR : KNIFE RIVER CORPORATION DBA KRC AGGREGATES r AGGREGATE MINEAND WASTEWATER SYSTEM SAN JOAQUIN COUNTY The California Regional.Water Quality Control Board, Central Valley Regi finds that: on(hereafter.Board),. I. Knife River Corporation dba KRC Aggregates (Discliarg�er) submitted a Report of Waste Discharge(RWD), dated 2 March 2001, to treat and dispose of industrial wastewater generated.at the KRC Aggregates Plant, an aggregate mining and washing facility. Additional information was submitted on 19 March 2001. 2. The Discharger owns and operates an aggregate mining and processing facility that discharges wastewater from sand and gravel washing operations to a settiing/recyclizig pond system. Most of the washwater is recycled, however, approximately 1,000 gallons per minute (1.4 mgd) may be fresh well water depending on product specifications. 3. The KRC Aggregate plant is located at 24717 E. Brandt Road, Clements. The facility is in Sections 29, 30, and 31, T4N,R9E, MDB&M as shown on Attachment A, which is attached hereto and made part of the Order by reference. 4. The property and aggregate washing equipment is owned and operated by the Discharger. The facility is on Assessor's Parcel Numbers 23-19-01 and-02; 23-16-02 and-03; and 23-27-09. a 5. The facility was constructed in 1986 and was operating in early 1988; it has operated consistently since then. 1 6. Waste Discharge Requirements Order No. 94-300, adopted by the Board on 28 October �I 1994, prescribes requirements for discharge of wastewater at KRC Aggregate, Inc.'s facility to recycling, evaporation, and percolation ponds on a 100 acre mining and processing property. Order No. 94-300 is neither adequate nor consistent with current plans and policies of the Board. 7. Processing equipment consists of wash screens and drums, crusher, vibratory screens, and a gold recovery circuit. Gold recovery is performed using gravimetric methods; no chemical methods of recovery(amalgamation or cyanide leach) are employed. 8. The processing facility and surrounding quarry areas occupy approximately 1,048 acres. The mine is being developed in phases as shown in the table below: 3 Projected Scheduled Phase Development of Mine Phase I Completed Phase IA Not mined, excavation, schedule indefinite Phase R Completed(graded, planted, and opened to drain)