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<br />5357 <br /> <br />) <br /> <br />Water Quality <br /> <br />Currently, ACWW A disinfects its deep well sources using chlorination at the wellhead. Because <br />of elevated levels of iron and manganese however, ACWW A is considering having to treat water <br />pumped from the Arapahoe and Denver aquifers. Additionally, any waters pumped from the <br />Laramie-Fox Hills aquifer will have to be treated and blended because of temperature and <br />hardness levels. Representative water quality parameters for Arapahoe wells in this area include a <br />hardness of 54 mgIL (as CaCO,), iron of 0.37 mg/L, manganese of 0.02 mg/L and turbidity of <br />0.38 NTUs. The Laramie-Fox Hills water is considered to be soft, while the Arapahoe waters are <br />moderately hard. <br /> <br />It is also recognized that the alluvial groundwater sources will receive higher concentrations of <br />point and nonpoint source pollutants as upstream effluent discharges and urban runoff nonpoint <br />pollutant levels increase in the future. It is anticipated that nanofiltration of these waters could be <br />required at some time in the future. <br /> <br />The Authority is facing a number of significant increases in the cost of water treatment in the <br />future. These include the cost of nanofiltration of alluvial groundwater, iron and manganese <br />removal from deep aquifers and the costs associated with new well construction to maintain <br />production capacity and meet future demands. <br /> <br />Conservation and Non-potable Reuse Programs <br /> <br />) <br /> <br />All development in ACWWA's service area is required to comply with the Unifonn Plumbing <br />Code for water saving fixtures. All water uses within the district are metered and outdoor uses are <br />managed through landscaping practices and irrigation scheduling. <br /> <br />ACWW A has developed a non-potable water system to provide water for irrigation purposes <br />from reclaimed wastewater effluent and raw water pumped from shallow alluvial wells along <br />Cherry Creek. This "dual system" is described in the Draft Non-potable Water System Plan, <br />(Wright Water Engineers, 1999). The non-potable water system conserves higher quality raw <br />water sources for the potable system and reduces the demands placed on the deeper non-tributary <br />aquifers. <br /> <br />A water conservation plan is needed to address water efficiency and dry year conditions when the <br />alluvial water sources along Cherry Creek are unable to operate because of their junior water <br />rights status. <br /> <br />Cherry Creek Augmentation Plan <br /> <br />ACWW A and CWSD operate an Augmentation Plan that gives the Districts the right to reuse <br />return flows that reach the alluvial aquifer as effluent from municipal wastewater treatment or as <br />deep percolation or surface runoff from lawn watering and other outdoor uses. ACWW A's <br />Augmentation Plan recognizes a net rate of recoverable return flow as 42 percent of total well <br />withdrawals. <br /> <br />~ <br />