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i ~ Western Mobile Apyregate • Asr/ult • Concrete February 14, 1997 III IIIIIIIII IIII III -,~r~C~~•J~D FEB 181997 Mr. Gary Curtis Enviromental Protection Specialist Colorado Division of Minerals & Geology 1313 Sherman Street ,Room 215 Denver, Colorado 80203-2273 Dear Gary: Corporate • Cen[ral5ervicee 1590 W Ihh Ave. Denver, Colorado 60104 303.657.4334 Fax J03.657. 4339 In response to Allen Sorenson's Memo of January 29th 1997 regarding the drainage at the Deer Creek Quarry site, DMG permit # M-79-214, please consider our following response. The Quarry has been at this location for some time and has not changed appreciably since the middle to late 1980's. It is our opinion that there have been major 10 year storm events at the quarry since this time. The site has been visited a number of times by our people, the land owners along with the DMG staff. There has not been any major erosion or sedimentation observed other than the minor soil slippage below the old scale location. This slippage occurred during a wet two month period just prior to the Lachell site investigation. In addition, there has been an infilling of the sediment pond over a 5 to 10 year period of time at the entrance. Under the current conditions on the site we would hope that it is realized that time and experience are the best indicators of what is to be expected in regards to drainage and sedimentation on the site as it exists today. We feel that the site is generally stable even though there has been some infilling of some of the sediment structures and isolated erosion as a result of the dormancy of our activities. The proposed improvements presented will allow the upgrading of the drainage and sediment control features. We ask that the existing sized channel provided under the January 14,1997 packet be allowed. Should we be required to install the increased sized channel as indicated in Allen's Memo we will have to remove a larger pars of the entrance road possibly resulting in inaccessibility of the site. We have reviewed and revised the previous drainage and sediment control submittal based on Allen"s Memo and our conference call of February 12th, 1997 with you, Allen Sorenson and Carl Mount. We hope that it best depicts our plans to reduce or eliminate the drainage and sediment impacts to Wildcat Gulch. Should you have any questions as to the plan, please feel free to contact our offices inc rely, .. John Hickman Land and Resources Manager cc: Mike Sheahan 8 Dean Massey ,Jc'~°rr ~vtC7~ tc~i-4-rYa,,, ~uA4w n7~,~~ j~Pd c r ~-.~ ~ ,t ~ r. A Reolanr! Group company ~-~~'