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/, <br />CORDILLERAN'~ -. <br />October 12, 2006 <br />Of.T Z 3 ~~.. <br />Division c~ .e..c:a ^~ ~n <br />Mining anc Safety <br />Mr. Steve Shuey <br />Colorado Division of Reclamation, Mining & Safety <br />Grand Junction Field Office <br />101 South Third Street, Room 301 <br />826 21 % Road <br />Grand Junction, CO 81505 <br />T: 970.263.7800 <br />F: 970.263.7456 <br />RECEIVED <br />OCT 1 2 2006 <br />GRAND JUNCTION FIELD OFFICE <br />DMSION OF <br />RECLAMATION MINING & SAFETY <br />Grand Junction, CO 81501 <br />Subject: N rth Clear Creek Construction Materials Ine, File No. M-2006-039, New 110c <br />Applicatiort~Second Adequacy Review R eSPo~r Sc~ <br />Dear Steve: <br />Thank you for your correspondence dated October 11, 2006, indicating the remaining issues <br />that must be addressed prior to the DRMS decision date. The following responses and <br />supporting documentation are provided to satisfy any remaining issues. <br />Exhibit C -Mining Plan <br />5. Please adjust the working bench and slope details to correspond with final slope <br />configuration necessary to satisfy the corrections required in item no. 11 below. <br />Based on the topography of the site, it is estimated that the approximate depth of material to be <br />mined is 80 to 100 feet. The material will be removed down to a horizontal surface which follows <br />the elevation contours of the toe of the slope. This site will be an open face mine, not a pit mine. <br />A dozer will push down the high wall material creating terraces as a safety break making the <br />slope more stable and reducing the need for reclaiming a large high wall. Each terrace will <br />measure approximately 30 feet wide and 15 feet high. The top high wall will be maintained on a <br />2h to 1 v slope during mining activities to prevent raveling. Mining and surface activities will not <br />extend to the up-gradient boundary of the permitted area; therefore, a buffer will exist to further <br />ensure that off-site impact does not occur. <br />8. Topsoil required for reclamation may not be used to create a diversion berm as this <br />could lead to erosional loss of this resource (see Rule 3.1.9(1)). Please indicate the <br />approximate depth of the sediment control ponds <br />Topsoil will not be used to create a diversion berm. It will be stockpiled on-site and protected by <br />implementing Best Management Practices discussed in the Stormwater Management Plan that <br />has been prepared for this site. <br />The sediment control ponds were sized to retain runoff generated by a 10-year, 24-hour, 1.9" <br />storm event. Each pond was designed to measure 30' x 30' x 4' deep. Based on the availab/e <br />information for this site, the basin locations are expected to be undertain by relatively coarse- <br />grained and permeable materials, meaning that runoff waters retained in the ponds are <br />expected to drain into the underlying soil quickly. <br />Cordilleran Compliance Services, Inc. <br />Grand Junction, CO • Denver, CO • Casper, WY • Laramie, WY • Lander, VVY <br />Environmental Consulting Engineers and Scientists <br />