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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2003-XXXX • 16 SPX CORPORATION MARLEY COOLING TOWER COMPANY SAN JOAQUIN COUNTY 2. Any proposed change in sludge use or disposal practice from a previously approved practice shall be reported to the Executive Officer and EPA Regional Administrator at least 90 days in advance of the change. E. Receiving Water Limitations: Receiving Water Limitations are based upon water quality objectives contained in the Basin Plan. As such, they are a required part of this permit. A receiving water condition not in conformance with the limitation is not necessarily a violation of this Order. The Regional Board may require an investigation to determine cause and culpability prior to asserting a violation has occurred. The discharge shall not cause the following in the receiving water: 1. Concentrations of dissolved oxygen to fall below 7.0 mg/L (ppm). The monthly median of the mean daily dissolved oxygen concentration at this location shall not fall below 85 percent of saturation in the main water mass, and the 95`h percentile concentration shall not fall below 75 percent of saturation. 2. Any individual pesticide or combination of pesticides to be present in concentrations that adversely affect beneficial uses, and total identifiable persistent chlorinated hydrocarbon pesticides to be present in the water column at concentrations detectable within the accuracy of analytical methods approved by the Environmental Protection Agency or the Executive Officer. 3. Oils, greases, waxes, or other materials to form a visible film or coating on the water surface or on the stream bottom. 4. Oils, greases, waxes, floating material (liquids, solids, foams, and scums) or suspended material to create a nuisance or adversely affect beneficial uses. 5. Aesthetically undesirable discoloration. 6. Fungi, slimes, or other objectionable growths. 7. The turbidity to increase as follows: a. More than 1 Nephelometric Turbidity Units (NTUs) where natural turbidity is between 0 and 5 NTUs. b. More than 20 percent where natural turbidity is between 5 and 50 NT-Us. C. More than 10 NTUs where natural turbidity is between 50 and 100 NTUs.