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Nevada NPDR";Pennits ~ I- rv CJl EPA has delegated the Nevada Division of Environmental Protection (NDEP) authority to issue NPDES Permits. Basic Management Industries (BMI) has eliminated industrial wastewater discharges to Las Vegas Wash. BMI now pipes wastewater to lined ponds where it evaporates. Two of the companies have been issued permits which allow discharge of cooling water to Las Vegas Wash with a limit of no more than 75 mgtL TDS greater than the water supply. Another Basic Management company has been issued a permit which allows discharge of surface storm water runoff. In the past, the Nevada Power Company (Company) discharged brackish cooling water from both the Clark and Sunrise Power Plants into Las Vegas Wash. Permits now prohibit such discharges and the Company treats and recycles water for further cooling before final disposition into lined evaporation ponds. The new recycling process has reduced the cooling water requirement by about 75 percent. The City of Las Vegas and Clark County Sanitation District (CCSD) were issued new discharge permits in January 1992. The City and County permits allow a flow of up to 66 and 90 million gallons per day (MGD), respectively, through January 1997. The permits include Waste Load Allocations (WLA) for total phosphorus and total ammonia, whole effluent toxicity testing, chlorine residual limits, and an ambient monitoring program in Las Vegas Wash and Las Vegas Bay. The WLA for total phosphorus applies from March through October and ammonia from April through September. The WLA do not apply to other periods of the year. In March 1994 the permits were revised to allocate part of the WLA to the City of Henderson. The City of Henderson was issued an NPDES permit in September 1992 to seasonally discharge up to 9.5 MGD to Las Vegas Wash from November through February. The Board of County Commissioners 'has approved an amendment to the Clark County 208 Plan which allows 'the City of Henderson to discharge up to 10 MGD on a year-round basis in addition to the seasonal 9.5 MGD discharge. In order for Henderson to discharge to Las Vegas Wash in the WLA period, permits were amended to adjust the WLA for each entity. A permit was issued to the City, of Henderson 7-1-94 with WLA, and other requirements similar to CCSD and the City of Las Vegas. Henderson will continue to use rapid infiltration basins and subsequent re-use. Henderson has an extensive re-use system, which NDEP encourages, including parks, cemeteries, a golf course and a green belt along the Boulder Highway. The CCSD plans to make direct discharge of part of Laughlin's wastewater effluent into the Colorado River and to make reuse of the remainder on local golf courses. The CCSD estimates that by the year 2000, 7,000 afty of treated effluent in Laughlin, a rapidly growing resort area located adjacent to the Colorado River, will ultimately be available, 2,000 afty will be reused, and 5,000 afty will be returned to the Colorado River for credit. An NPDES permit 5-6