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growth related issues such as wastewater and water quality. The plan will be passed on to the 1999 legislative session. o N C) 0) Expansions of the CCSD and CL V wastewater treatment facilities are underway in accordance with approved 201 facilities plans. Industrial pre-treatment permits are being required by the CCSD for reverse osmosis treatment of shallow groundwater and on-site treated gray water to be used by the Mirage/Treasure Island development in its landscaping and decorative water features. This represents a new beneficial use of shallow saline ground water which is pumped for dewatering around building foundations. Local government entities within urban Clark County are also participants in the NPDES Stormwater Quality Management Committee to identify and implement measures to meet State stormwater permitting requirements. Future 208 amendments are expected to address gray water issues and shallow ground water issues, to update population projects, and to incorporate BMPs identified in the stormwater permit for the Las Vegas area entities. In June 1998, the State Environmental Commission adopted revised water quality standards for the Las Vegas Wash and Lake Mead. The revision were based on data collected from 1991 through 1996 and include changes to total dissolved solids (TDS) requirements to maintain higher quality (RMHQs). RMHQs are established when the existing water quality is better than the criteria necessary to protect the beneficial uses. For the upper Las Vegas Wash, the TDS RMHQ was lowered from 2,300 mg/I to 1,900 mg/l; and for the lower Las Vegas Wash, the TDS RMHQ was lowered from 2,600 mg/l to 2,400 mg/l. The lower TDS concentrations seen in the Las V egas Wash in recent years most likely results from dilution of the saline groundwater which discharges to the Wash by the increasing, but relatively low TDS flows discharged from the wastewater treatment plants. Facilities Plans The City of Henderson recently completed a Facility Plan which defines various stages of wastewater treatment expansion to address growth and potential changes in regulatory requirements. The existing Water Reclamation Facility was upgraded to 20 MGD in 1998 and will be expanded to 30 MGD by 2002. The Facility will have the capability of discharging to the Las Vegas Wash on a year-round basis. However, the City will continue to encourage the use of reclaimed water and will continue to use the existing rapid infiltration basins as a means of disposal. The CCSD is nearing completion of expanding its treatment facilities to a capacity of 110 MGD. The expanded facility will continue to use biological nutrient removal processes to remove phosphorus and nitrogen. Advanced treatment consists of additional filters and ultraviolet light disinfection. The capacity of the City of Las Vegas' treatment plant is 66 MGD. The treatment plant provides secondary treatment, phosphorus removal, and nitrification to remove ammonia. The treatment facility treats the flows of both the Cities of Las Vegas and North Las Vegas. Construction permit applications are pending for expansion to 91 MGD. 4-23 &J