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I)'Li-1J-t)~ Tilt 1i~Ci riM r•r'b !s!~ ~ I C' . <br />.,d•.n ' I`~`'U T~ N: D .t, r;ld >;;:1. 3087 <br />4 III IIIIIIIIIIIII III <br />~~ SR1K EConsulting <br />=~' <br />r <br />December 19, 2000 <br />SRK Project No. 54202 <br />Dtviston of Minerals and Geology <br />1313 Sherman Street, Roorn 215 <br />Denver, CO 80203 <br />Attn.: Thmnas A Shreiucr <br />90,7 <br />F. 02/ i 3 <br />Sletl¢n Robertson entl Kneen (U.S ), Inc. <br />71]5 Wesl Jetleson Avenue <br />Swk 3000 <br />Lakewood. Coloiada <br />902]5 USA <br />a~mail: denver$srN com <br />URS' help'/IwwwsN pam <br />Tel: ]07.985.17]7 <br />Faa~ 707.985.9967 <br />RC: Longmmu Distel Operation, ADI-3, Adequacy Letter Response, Permit No. M-89- <br />029 <br />Dear Mr. Shreiner: <br />SRK Consulting, on behalf of Camus Colorado, Inc. (Aggregate Industries) is providing this <br />response to your adequacy review comments dated November 29, 2000 regarding the above <br />ret'erecced amendment application. Each of the Division of Mining and Geology (DMG) <br />comments is addressed individually as follows: <br />6.4.7 Exhibit G -Water Infot7rtation <br />]. Additional hydrologic assessment will be completed to evaluate groundwater inflow into <br />proposed mine areas to facilitate the final sizing of the (low control structures included in the <br />re~;lamation plan. Data will be collected and used from the current de-watering activities on <br />the Digelow tract, and estimates of alluvia] aquifer permeability will be developed to <br />formulate an analytical and/or a numerical groundwater tlow model. 'this model will be used <br />to predict groundwater inflow into the areas [o be reclaimed and to estimate the influence on <br />ac,uifer water levels in the vicinity during mine de-watering activities. This attalys{s will be <br />completed and findings submitted to DMG by January 24, 2000. <br />2. Sr:u the response to comment # 1. II should be noted that [here has been no impact realized to <br />water supply wells installed m the alluvial aquifer from existing mine de-watering activities <br />in the vicinity. Also, note that the response to comment # 7 contains additional "water <br />information" as it pertains to permitted vipiniry water supply wells. <br />6.4.1(] F'xhibit J-Vegetation Information <br />3. Lt response to DMG's request a Noxious Weed Control Platt is attached and to be included <br />within the subject amendment application. <br />G.4.1 l Exhibit L -Reclamation Costs <br />4. The total volume of soil listed in Table i3.1 (Reclamation Costs) is i,i91,713 cubic yards. <br />"Iltis volume includes volulttes to re-grade pit highwalis aitd pit bottoms, as well as placement <br />cf topsoil. As indicated in Note #3 on Table 13.1, the total volume does not include <br />placement of overhurden into permanent stockpile areas. The placement of soil into <br />pemtanent stockpile areas is considered a mine operations cost. Therefore, the estimated <br />volume of soil to be placed into the permanent stockpile areas (i.e., 665,337 cubic yards) is <br />rot included in the volumes used to estimate reclamation costs in Table 13.1. However, [his <br />'. Grown Om<ay In. ~ Norio Amarican Otllces: <br />nnso-alla I EIMo 7]5.757 <t 51 <br />Nerln Amenca fan Collins 970 407.8302 <br />i SaaWern ANica I Rono 775.B2B.6B00 <br />?L\GKnc111Pmjcei155202tUMGRcv2espf.rt.doe ~ Snom nmarlca ~ Tucson 92o 5as.7BeB <br />i Un,led Kingdom 1 Vancouver 60a.fiBr 419fi <br />