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Pip EL000 <br />~`` ]°° <br />a o <br />o ~ ~o <br />268bn . i~~ay~ <br />L. SCOtt TUGker, Executive Director <br />Apri125, 2002 <br />RECEIVEC <br />APR 2 6 2:~ <br />Division of Minerals and Geoid;- <br />Board of Directors <br /> Erica Crosby <br />Executive Committee: ~ <br />N Division of Minerals and Geology <br />corny Reynolds = <br />~ 1313 Sherman Street, Room 215 <br />Chaiman <br />Clry/County o6Denver g Denver, CO 80203 <br />Debra Vickrey p <br />Chairman Pro-Tem <br />Arapahoe County <br />~ <br />Subject: Review of Permit Amendment Application (AM-002) <br />Paul Danish ~ <br />~ Aggregate Industries Brighton Mine Permit No. M-1977-436 <br />' ' <br />Secretary <br />Boulder County <br />Gretchen Cerveny Dear Erica: <br />Treasurer e <br />ClryofWhea[Ritlge -' <br />w <br />Elaine Valente <br />b ~ <br />'" This letter is in res onse to our re vest for our comments concernin the <br />p Y q g <br />er al large <br />Mem <br />Adams County z above-referenced application. We appreciate the opportunity to review this case only as it <br />Members: < relates to the South Platte River. We have the following comments to offer: <br /> s <br />City of Broomfield ~ 1. The typical grouted boulder rtmdown for each off-site tributary needs to show <br />Steve Burkholtler <br />city or Lakewood ~ <br />~ <br />more detail, including crest elevations, toe elevations, and cross sections. <br />Ken Fellman According to the Urban Storm Drainage Criteria Manual, grouted boulder <br />CM of Arvatla <br />- <br />~ <br />structures are limited to 4:1 slopes. - - - - - - - - - <br />Stephanie Foote ° <br />Ciry/County of Denver _ <br />Nancy Heil <br />City of Westminster ~ 2. The open channels from the point at which the off-site tributaries enter the mine <br />B. H. Hoffmaster <br />~ site to the grouted boulder rundowns need to be designed and constructed during <br />Engineer the mining operation. <br />Michelle Lawrence e <br />Jefferson County 8 <br /> LL 3. The applicant has stated that the off-site tributary boulder rundowns into the <br />City of Aurora <br />i <br />K <br />n <br />M mining cells will be constmeted by the future operator of the reservoir (which is <br />at <br />ieen <br />acKenz <br />e <br />Ciry/County of Denver ^ <br />our understanding to be e ity of Thornton). This is unacceptable to the <br />W. Mlke Maxwell <br />l <br />D <br />C „ <br />q District. Since the a licant has chosen to interce t these tributaries rather than <br />PP P <br />oug <br />as <br />ounty <br />Jim McShane ~ channelize them to the South Platte River, as per the "Todd Creek and DFA <br />Town of <br />Columbine Valtey ~ 0052 Watersheds Outfall Systems Plan Alternatives Development and <br /> <br />Deborah Ortega i <br />~ <br />Evaluation Report" (OSP) dated November, 2001, it is imperative that adequate <br />Ciry/County of Denver ~ drainageway stability measures (i.e. boulder rundowns) be constructed during <br />Art Patton <br />Engineer <br />the mining phase to control upstream degradation and protect the Brantner Ditch <br /> and Riverdale Road from potential damage. <br />spr/bryan/min&geo <br />