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` WASTE DISCHARGE REQI.__ EMENTS ORDER NO. <br /> KNIFE RIVER CORPORATION DBA KRC AGGREGATES °I <br /> AGGREGATE MINE AND WASTEWATER SYSTEM 8 <br /> SAN JOAQUIN COUNTY <br /> 10. The addition of chemicals to the aggregate processing operation is prohibited. <br /> 11. Surfacing of wastewater in the septic tank or septic tank leachfield is prohibited:. <br /> B. Discharge Specifications: <br /> L The average monthly discharge flow to the ponds shall not exceed 3.0 million gallons per <br /> day. Ip <br /> 2. Objectionable odors originating at this facility shall not be perceivable beyond ttic limits <br /> of the wastewater treatment area. <br /> 3. As a means of discerning compliance with Discharge Specification No. B.2, the,ldissolved <br /> oxygen content shall not be less than 1.0 mg/l in any pond at any time, as measured at a <br /> point at as far as practical from the pond inlet and within one foot of the water. <br /> 4. Water or process wastewater shall be usedfor dust control or onsite irrigation in�a <br /> manner that will not cause runoff to uncontrolled areas. <br /> 5. The discharge shall remain within the designated disposal area at all times. Wastewater i <br /> shall not be discharged to areas not identified in Attachment B. I� <br /> 6. The wastewater treatment ponds.shall not have a pH of less than 6.5 or greater than 8.5. <br /> Ip <br /> 7. The Discharger shall operate all systems and equipment to maximize treatment of the <br /> wastewater and optimize the quality of the discharge. <br /> 8. The ponds shall be managed to prevent breeding of mosquitoes. In particular, <br /> a: An erasion control program should assure that small coves and irregularities are not <br /> created around the perimeter of the water surface. <br /> b. Weeds shall be minimized through control of water depth, harvesting, or he 1bicides. <br /> c.. -Dead algae, vegetation, and debris shall'not accumulate on the water surface. <br /> 9.t The ' <br /> Dischar ers wastewaters stem shall be designed,g y geed;constructed, operated, and <br /> maintained to prevent inundation or washout due to floods with a 100-year return <br /> frequency. <br /> 10. All stockpiled products shall be managed to prevent erosion of sediment to surface water. <br /> drainage courses. <br /> ' <br /> 11. Newly constructed or rehabilitated levees or berms shall be designed and construlcted <br /> under the direct supervision of California Registered Civil Engineer or Engineering k <br /> Geologist. <br /> 12. The freeboatd in all ponds shall never be less than two feet as measured vertically from <br /> the water surface to the lowest point of overflow. <br /> i <br /> ---- I l <br />