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~~ w, CAM <br />~~ Banks and Gesso, LL~ <br />~~ <br />Januarys, 2007 ~N 1 12001 <br />m-2oo~-0~~ <br />720 Kipling St.,Suite117 <br />Lakewood, Colorado 80215 <br />(303)274-4277 <br />Fax (303) 274-8329 <br />www. ban ksandgesso.com <br />Division of Reclamation, <br />Rick Wenzel Mining and Safaty ~ <br />Colorado Division of Reclamation, Mining, and Safety , <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Grand River Park Project, Addendum to Janua 3 Adequacy Response <br />Dear Mr. Wenzel: <br />Based on our meeting concerning the Grand River Park Project Regular 112 <br />permit application on January 5, 2007, this memo is intended to clarify proposed <br />specifications for drainage features on the M-2006-046 site. <br />As noted during review of the January 3, 2007, second adequacy response, <br />water management plans for the site have been revised to eliminate certain <br />physical elements that are redundant or counterproductive. ~ Regarding the <br />justification for modifications to the former clarification basin and spillways, <br />please note the following: <br />1. Clarification of Comment 10. <br />The consulting engineer's (Mr. Ramsay M. McDermid, P.E.) discussion of <br />the dimensions of the "clarification basin" was composed early in the <br />preparation for the applicant's January 3, 2007, adequacy submittal. Most <br />recently, in December 2006, following the drafting of the Water <br />Management Plan, the consulting engineer informed Banks and Gesso, <br />LLC, of a revised es±imate for the.basin dimensions at.the northern end of <br />mining Phase 1 B. <br />The new scheme to implement water quality functions prior to pumping <br />eliminates the need for sediment release in a large, slow-flow pond. The <br />re-drawn "regulating pond" has a 750,000 gallon storage requirement, in <br />accordance with water management needs. Mr. McDermid provides other <br />details of the regulating pond in the Water Management Plan, submitted in <br />response to Comment 21f. <br />`~ The dimensions-cited by Mr. McDermind in his narrative for,;Comment 24 <br />_ are•superceded and specifically defined by a more recent size estimate.in• <br />the applicant's response to Comment 10. <br />