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Leaf Engineering, Inc. <br />2607 W.10'"Street <br />Greeley, CO 80634 <br />Forrest Leaf, P.E. <br />December 19, 2002 <br />Revised June 16, 2003 <br />Mr. Kevin Rein <br />State Engineer's Office <br />1313 Sherman Street, Room 818 <br />Denver, Colorado 80203 <br />{970)-351-0210 Phone <br />(970}392-0306 Fax <br />forrest_leafQa gwest.net <br />Re: Request for Temporary Substitute Supply Plan (TSSP) for Hall-Irwin <br />Corporation's Nissen pit Neaz Kersey, Colorado <br />Deaz Kevin: <br />This letter is a request for a TSSP for Hall-Irwin Corporation's Proposed Nissen aggregate mine <br />in Ule 51/2 of Section 12, 4N, 65W, east of Greeley. All applicable fees have been paid via the <br />December 19, 2002 original submission. This letter has been revised pursuant to comments <br />received by Wright Water Engineers, Inc.. <br />Description of Mining Operations. <br />Mining operations at the Nissen mine will produce SOO,000 tons of product annually. A future <br />concrete batch plant will produce 100,000 cubic yards of concrete annually. Figure I, enclosed, <br />shows the location of the Nissen aggregate mine. This mine will be lined with a bentonite slurry <br />wall in late 2003 or eazly 2004. Mining will not commence until the slurry wall is constructed. <br />Consumptive Use <br />The consumptive use attributed to the Nissen aggregate mine is evaporation from limited open <br />water surfaces from de-watering trenches as the aggregate will be dry mined. In addition to the <br />aggregate production, water will be required for a concrete batch plant hatching concrete, gravel <br />washing and on-site dust suppression. The water used in the batch pant, and dust suppression <br />will be produced from alluvial well #ISS1F, as shown in Figure 1. All of this use is considered <br />100 percent consumptive. Table 1 presents the water consumption for the aggregate mining site. <br />Water Rights • Hydrology • Hydraulics • Water Quality <br />E:\LgflFlalflGrevel PicsGSau[h Platte\Rein Revised Nissen Pit TSSP Request Letteudoc <br />