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-- = • ~ I1IIIIIIIIIIIIIIIII~` <br />STATE OF COLORADO <br />MINED LAND RECLAMATION DIVISION <br />Departmern of Natural Resources <br />13!3 Sherman SI . Hoorn 275 <br />Denver. C060203 <br />303 8663567 <br />Fn x. 303 332 6106 <br />January 18, 1990 <br />Mr. Mark Klune, General Manager <br />Valco, Inc. <br />Pueblo Concrete Division <br />P. O. Box 857 <br />Pueblo, CO 81002 <br />Re: Valco West Pit, Permit No. M-77-573, Amendment No. ? <br />Dear Mr. Klune: <br />pG CI;~L <br />,W: , 6~ .'. p9 <br />tier . n. <br />(~ ri) <br />t,_' <br />~ /P ]6 <br />Rov Rnrner <br />Go.ernor <br />Fretl R Ranid. <br />Drvis~on D:rec~or <br />The Division is currently reviewing your application fora technical revision <br />to Permit No. M-77-573. The revision pertains to the chance of size for the <br />post-mining lake approved for Area 4, Stage 4. Valco, Inc. requests <br />permission to create two lakes: one lake in Stage 4, and one lake in Stases 5, <br />6, 7, and 11. A dike will be constructed in the far east end of Stage 4, <br />thereby seoaratina_ the two lakes. The currently approved post-mining land <br />form is one large lake covering Stages 4, 5, 6, 7, and 11. <br />During our review of the technical revision, a number of questions and <br />comments were developed. The followino_ items must be addressed before we can <br />approve the revision: <br />X. A description of the materials used to construct the dike. <br />/ 2. A representative cross section of the dike. <br />N~ 3. Please demonstrate the factor of safety to be achieved when the dike is <br />completed. This demonstration should include a slope stability analysis, <br />ore pa red by a oualified professional, experienced in stability <br />determinations. <br />Q .A' A statement of the design specifications for the compaction and density <br />to be achieved durin_o construction of the dike. The Division recommends <br />a minimum density of 95A of the Proctor Maximum. <br />~~~~u~~' S. A description, design, and cross section of a spillway or outlet <br />(~~.~-~^ sufficient to dewater the lake during a 100-year flood event. <br />d d}"`"- <br />ao-U. A statement that the design and construction of the dike has been <br />inspected and certified by a qualified registered professional engineer. <br />Certification of the constructed dike shall be forwarded to the Division <br />immediately followino construction. <br />