Cal. Code Regs. tit. 23 § 3956
Exemptions to regionwide, hydrologic unit, and hydrologic area prohibitions may be granted as specified in Chapter 4.1 of the Water Quality Control Plan. Most exemptions are based on a finding by the Regional Board Executive Officer if so delegated, that the discharge will not result in exceeding the water quality objectives or unreasonably affect the water for its beneficial uses. The Lahontan Regional Water Quality Control Board (Regional Board) will base this determination on an analysis of the criteria contained in State Water Resources Control Board Resolution No. 68-16, the Statement of Policy with Respect to Maintaining High Quality Waters in California.
This amendment applies to the Mojave Hydrologic Unit for surface water that is tributary to the West Fork Mojave River or Deep Creek (Prohibition 1), the Silverwood Lake, Deep Creek, and Grass Valley watersheds (Prohibition 2), and surface waters upstream of the Lower Narrows (Prohibition 4). Language was added to Prohibitions 1 and 2 that exempts storm water discharges unless such discharges create a contition of pollution or nuisance. Prohibition 2 now applies to discharge of waste to land or water.
Cal. Code Regs. Tit. 23, § 3956