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COLORA DO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />April 15, 2015 <br />Mrs. Connie Davis <br />Aggregate Industries - WCR, Inc. <br />1687 Cole Blvd., Ste. 300 <br />Lakewood, CO 80401 <br />Re: Aggregate Industries - WCR, Inc., Platte Valley Operationjile No. M- 1989 -120 <br />Technical Revision No. 4 (TR -04) Adequacy Review <br />Mrs. Davis, <br />The Division of Reclamation, Mining and Safety (Division /DRMS) has reviewed the content of <br />the technical revision (TR -04) for the Platte Valley Operation, File No. M- 1989 -120, and submits <br />the following comments. The Division is required to make an approval or denial'decision no <br />later than April 17, 2015 therefore; a response to the following adequacy review concerns <br />should be submitted to the Division as soon as possible. <br />1. The Division accepts the Operators plan to repair the flood erosion feature on the east side <br />of the South Platte River. The Operator committed to providing the Division a copy of the <br />Army Corps of Engineers Nationwide Permit 3 (NWP) when issued and provide notice to the <br />Division of the completed erosion repair work. <br />2. The Operator states completion of the riverbank project will re- establish AI's pre -flood land <br />extent and thus the minimum 100 -feet off -set from the South Platte River to Phase 2 of the <br />Platte Valley site. In order to provide additional protection between Phase 2 and the South <br />Platte River, Al proposes to stabilize the pit side of Phase 2 by backfilling to grade <br />approximately 840 lineal feet along the west boundary to establish a total 200 -foot off -set <br />from the South Platte River. <br />Please confirm the backfilling of Phase 2 to establish a 200 feet offset from the South Platte <br />River is the intermittent backfilling operation the Operator committed to completing by <br />April 2004 in Item #17 of the Response to Adequacy Review Comments, dated December 1, <br />2003, for Amendment application AM -01. <br />COt0 <br />I w� of <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http: / /mining.state.co.us <br />John W. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director 1876 *' <br />