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May 14, 1996 <br />Mr. Harry B. Ranney <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />Department of Natural Resources, Colorado <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />nr_~t=11~EQ <br />MAY 15 )yy6 <br />Division o~.Wlinerals & GuoWgy <br />RE: Adequacy Review, TR-29, Chimney Rock Mine, Permit No. C-81-023 <br />Deaz Mr. Ranney: <br />At the request of Mr. Mike Keegan, Kaiser Ventures, Inc. (Kaiser), the following information is <br />provided iri response to your (DMG) letter of April 16, 1996. A revised Exhibit 7, Sediment <br />Control Design Criteria, is enclosed which addresses your comments as discussed below. <br />DMG letter subparagraph l: <br />1. .Rule 4.05.6(I1)(f) requires the combined upstream and downstream slopes of the settled <br />embankment not be steeper than Sh:ly, with neither slope steeper than 2h:ly. Currently, <br />according to We as-built drawings in the permit document, Ponds 2,. 4, & 5 do not meet this <br />requirement. These may be approved if the Division is provided appropriate analysis that the <br />embankments aze stable. <br />Response: <br />Kaiser submits this relevant information showing that the embankments, as constructed, are stable: <br />a. Stability over time <br />The as-built drawings of 7-7-91 (Revisions 1) appazently depict the embankments as <br />originally constructed (some spillways were modified after construction and before July 7, <br />1491): No quarterly inspection reports provide an indication of slope instability (or <br />potential failure) to date. <br />b. Temporary structures <br />The embankments (sedimentation ponds) aze temporary structures and are not proposed <br />for retention in the reclamation plan. The structures aze nearing the end of their <br />functional purpose. Kaiser plans to submit a Phase II Bond Release Request for the <br />reclaimed lands during calendaz year 1996.. If approved, these ponds (as well as Pond 003' <br />and the Sediment Trap) would be removed. <br />. 5990 Greenwood Plaza Blvd. SuiEe 250.•`Egglewood, CO 80111 <br />(303)850-0930~~ Fax (303)721-9298 <br />