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e~c services Consuttin9 in Water Resources, Oams, and ConsfNCfion March 12, 2007 Mr. Steve Witte, PE Division Engineer Colorado Division of Water Resources Water Division 2 310 East Abriendo, Suite B Pueblo, CO 81004 Re: Administrative Approval for Proposed Wash Water Usage Pine Ridge Pit (Leadville) -ACA Products, Inc. Deaz Mr. Witte: Per a recent phone discussion with Kalsoum Abbasi, please fmd below a request for administrative approval for the temporary use of water to wash gravel at ACA Products' Pine Ridge Pit near Leadville, just southwest of the Town of Malta, Colorado. More specifically, the water will be used for the initial fill of the sediment pond (approx. 10 ac-ft); evaporation from the pond (conservatively assumed to be I ft over 2 acres, or 2 ac-ft); and wash water contained within the aggregate that leaves the site (assumed to be 4% by weight on 20,000 tons, or approx. 0.6 ac- ft); for a total of approximately 13 ac-ft required. The water will be delivered to the site via a diversion off of Half Moon Creek through the Templeton Ditch. ACA Products (ACA) has leased 90 ac-ft of water from The Pueblo Board of Water Works (Pueblo) to be delivered between June 1 and July 15`s. The balance between anticipated consumptive use and water available for delivery is intended to cover ditch losses. Attached please fmd a letter from Pueblo accepting ACA's proposal to lease the water. Pueblo does not have a water right on Half Moon Creek and intends to replace water taken through the Templeton Ditch dlrectly to the Arkansas River. The Colorado Water Conservation Board holds a 7 cfs minimum in-stream flow right on Half Moon Creek to the confluence with Lake Fork Creek that will have to be kept whole. As noted below in Figure 1 and Table 1, mean daily dischazge at USGS Gaging Station 07083000 HALFMOON CREEK NEAR MALTA, CO (approximately 1 mile upstream of the Templeton diversion) for the period of June 1 through July 15 ranges from 79 to 144 cfs. The period of record is 60-61 years from 1945-2006. This would indicate that for the 6-week time period of interest, the minimum in-stream flow right should not be affected by ACA's diversion. This diversion is only intended to be made in years of plentiful water supply; the water source and request to the State for adnunistrative approval will be evaluated and made separately for each yeaz of the intended use. P rn t`ession al Engineering and Con struclion Services, LLC 702 Gregg Drive PO Box 5073 Buena Vista, CO 81211 p. (719) 395-8270 front.o lfice®pce ser v.com f'. (7191 395-8!03 a3