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MRY. 5.2000 f3:36RM DIViMINERRLS&GEOLOGY N0.709 P.2~3 • • STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Deparonent of Na¢I21 Rnources 7373 Sherman 5r., Room 215 Denver, (;,ulorad0 80203 Phone: (303)Bfifi•3567 FAX. f3031 832.8106 DATE: May 4, 2000 T0: Gregg Squire FROM: Allen 5orcnsoa ~~ RE: Adequacy Response Dated May 2, 2000, Mobile Pre-Mix Concrete Inc., Riverbend Pit, File No. M-00.016 DIVISION O F MINERALS GEOLOG 8111 Owem Governor Gre¢ E. Welcher Eu[ulve Director Mj[hael 9. Lang Diririan D'vecmr The following application adequacy items are limited to the portions of the application adequacy rrsponse dated May 2, 20001abeled "Response to Mr. Allen Sorenson Comments Submitted oh April 13, 2000." 1. In order to obtain 20 percent liner replacement cost bonding, the Applicant has provided dgsign drawings and specifications for the installation of the pit liner along with a quality assurante/quality control plan. These documents will be binding under the terms of the permit. The followipg additional specifications, statements, and modifications must be provided for the Division to approve the liner plan and accept the proposed 20 percent liner bond. • The Division will require a statement that the plans and specifications, once approved, could not be altered without consent by the Division • The moisture content specification should be changed to no mare than 1 percent dry of optimum for the clay/shale core (zone 1) material. Lower permeability will result if the material is compacted slightly wet of optimum. • The applicant must provide a specification for maximum loose lift thiclmess fot placement of zone 1 and zone 2 materials, • The applicant must prov#dc specifications for gradation and plasticity of zone 1 material. 2, The Applicant status the protective measures recommended by the Urban Drainage and Flood Control District will be mployed to stabilize the areas between the pit and the river. These protective measures will allow the Operator to mine within 200 feet of the river and within 100 feet during the low flow seas n. The Urban Drainage and Flood Control District recommendations are contained in the publi oa '"I'echttical Review Guidelines for Gravel Mining Activities; ' December 1987. The A ]icant must describe which of the recommended protective measures will be employed and where hey will be instaUcd. The Applicant must further provide a cost estimate for the installation of the protective measures. The Division must bond far their installation to assure that the riverside crtns will be adequately stabilized in the event of pernut revocation and bond forfeiture.