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<br />Table 2 shows the consumption data for Broomfield since 1992. The largest <br />customer class, approximately 60%, is single family residential. The total of all <br />residential classes is approximately 69% of the total consumption. The <br />combined Commercial and Industrial classes amount to 15% of the total. <br />Irrigation consumption has almost doubled since 1992, The combined Irrigation <br />and City Park classes account for 14% of the total consumption, Based on this <br />break down, Broomfield's water conservation efforts will focus primarily on <br />residential use. The city is developing a non-potable reuse program to address <br />the irrigation/city park use to reduce the peak day demand on the drinking <br />(potable) water system, A voluntary water audit program will address the <br />commercial/industrial use, The city views these conservation programs as <br />valuable tools to reduce peak day demand on the potable water system. This <br />will defer capital expenditures for expansion of the water treatment plant, and <br />have other beneficial effects Le, defer the need to purchase additional water. <br /> <br />3,0 Historv and Future Water Supplv Considerations <br /> <br />Great Western Reservoir is located in Sections 6 and 7 of Jefferson County <br />(Figure 1), The reservoir was built in 1904 on the Walnut Creek channel for <br />storage of irrigation water for local agriculture, When Broomfield became <br />established as a residential community in the late 1950's the reservoir was <br />developed as a water supply, and was purchased by the City of Broomfield in <br />1962. The current storage capacity of. the reservoir is 3250 acre-feet, and it <br />covers about 150 surface acres when full. The maximum depth is 62 feet. The <br />reservoir is owned and operated by the City as a drinking water storage facility <br />only, <br /> <br />The proximity of Great Western Reservoir to Rocky Flats, and its geographic <br />position "downhill, downstream, and downwind" have been a source of concern <br />to Broomfield's residents for many years, In order to alleviate public fears about <br />the drinking water supply, Broomfield has sought the best possible protection <br />against comrollable sources ot conlamlnallon, Public accesslOthe reservoir <br />site is restricted, Broomfield has advocated stringent water-quality standards for <br />Great Western Reservoir. In 1981, the Colorado Water Quality Control <br />Commission (WQCC) classified Great Western Reservoir for water supply use <br />only, In 1984, the City requested and the WQCC adopted additional <br />classifications and water quality standards to provide an additional layer of <br />protection to Broomfield's water supply. Under the current operating regime, the <br />water quality in Great Western Reservoir meets all of the applicable numeric <br />, standards; however, the proximity of Rocky Flats to Great Western Reservoir, <br />and controversy surrounding the clean-up of Rocky Flats, continue to raise <br />doubts about the future and continued safety of Great Western Reservoir as a <br />drinking water supply, <br /> <br />8 <br />