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Appendix 2 - Centennial Water and Sanitation District (Centennial) District Boundary! Service Area The Centennial Water and Sanitation District (Centennial) provides water supplies to the Highlands Ranch community in northern Douglas County along C-470 from Santa Fe Drive to Quebec Street. The service area includes primarily residential development and associated light commercial business uses with a developing office park in the northwest part of the community. The current service area includes 4,200 acres of development with an additional 4,700 acres of zoned development that will be built out by about the year 2010. Centennial provides potable water service to areas outside Highlands Ranch (Extended Service Area) that are served by the Northern Douglas County Water and Sanitation District. This service contract is a permanent obligation. The Highlands Ranch Conservation Area lies to the south of the Highlands Ranch developed areas and extends to U.S. Highway 85. This area will see very little development although Centennial has appropriated and adjudicated the non-tributary groundwater resources underlying the Conservation Area for its use. Centennial has developed both surface water supplies and the tributary/ nontributary groundwater resources underlying the service area. Raw surface water is pumped from diversion facilities along the South Platte River to McLellan Reservoir and is then pumped to the Joseph B. Blake Water Treatment Facility for treatment and distribution. Groundwater resources are developed across an extensive wellfield throughout the Highlands Ranch service area. All wastewater is collected and treated at the Marcy Gulch Wastewater Treatment Plant and discharged to the South Platte River. Return flows are used to augment surface water diversions. There is therefore a nonpotable reuse program at Centennial when wastewater discharges are used to augment diversions in accordance with the district's augmentation plan. Centennial is currently developing 6400 acre-feet of off-channel storage from a previously developed gravel pits below Chatfield Reservoir to store and divert additional South Platte water. Since 1992, Centennial has been conducting an active aquifer storage and recovery program through a number of its nontributary wells using treated water from the Denver Water distribution system. At this time, Centennial has been recharging the Denver, Arapahoe and Laramie-Fox Hills aquifers.