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NORTH AMERICA <br />Materials <br />September 3, 2002 <br />RECE~v,~,u~~ <br />SEP Nttnsre~6 dpeola9~ <br />pivisaa~ <br />Mr. Tom Schreiner Permit #• - o Confidental2: <br />Division of Minerals and Geology Class: Type-Seq.: <br />1313 Sherman St., Room 215 From: To: <br />Doc. Nam 1 <br />Denver, CO 80203 Doc. Date ('rf no date s m <br />RE: River Valley Resoarce, F5na1 Adequacy Answers, FYIe Number M-2001-090 <br />Deaz Tom: <br />This letter is a response to your letters of January 14, 2002 and August 20, 2002. This letter <br />contains the answers to your final adequacy review comments. <br />Exhibit D -Mining Plan <br />3. We anticipate accepting approximately 10,000 cubic yards per yeaz of clean, inert fill <br />which will be used to backfill the slopes of the pit. The fill will arrive intenninently <br />and the maximum volume of imported fill to be stockpiled at any one time is 4,000 <br />cubic yards. <br />Exhibit E -Reclamation PIan <br />18. The Swale to be relocated functions as a wastewater irrigation ditch as the rancher <br />flood irrigates the hay fields and pasture. Some of the Swale has been dug and <br />redirected over time to facilitate the flow. The consumption of the irrigated <br />meadowland by the mining operation will result in less wastewater flows in the <br />Swale. <br />Attached with this letter is a typical cross section of the relocated Swale. It has been sized as <br />the same azea as the estimated average size of the present Swale. The relocated• Swale will be <br />constructed of native compacted soil with a gravel bottom. <br />With less acres irrigated and only athree-month irrigation season, the Swale conveys water for <br />a short time. Therefore we propose to use the upland area Bass mixture as described in <br />Exhibit E of our application. The maximum slopes on the relocated swail will be 3 to 1. <br />LAFARGE WEST, INC. <br />1590 W. 12th Ave., Denver, Colorado 902043470 <br />Office: R03) 657-0000 Fac p03) fi57~339 <br />wra.e.n uqm wwr <br />