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.,.. III IIIIIIIIIIIIIIII GREG LEWICKI AND ASSOCIATES 1645 Court Place Suite 309 Denver, Colorado 60202 ~303~629-9335 July 19, 1991 ~ ~ "' 1 ~,_.~ ~~~~~~~ Dave Berry ~~~ x ~ 1!~t3i Mined Land Reclamation Division 1313 Sherman Street 2nd Floor tined ~,inc Denver, CO 80203 Reclamation Divisiur Re NOVS N0. C-91-005, C-91-006 and C-91-007 Dear Dave: This letter is a response to the violations mentioned above. For Violation C-91-005, American Shield commits to revegetating the site according to the approved revegetation plan by October 30, 1991. For Violation C-91-005, the following material is submitted to demonstrate that the area that does not drain to the existing sediment pond will be controlled and will not cause damage to the waters downstream: The total area that does not drain to the sediment pond is 2.2 acres. Currently, 2.0 acres of the total drains to a series of hay bales anchored into the ground with 4' length rebar. Two rebar have been placed in each bale. Three rows of three bales each have been installed where the dam of the small sediment pond once stood. The attached sheet shows the 10 year - 24 hour peak flow calculation for this drainage area. The peak flow is l.7 cfs. The remaining 0.2 acres which does not drain to the hay bales is a result of the fact that the mine had stockpiled topsoil outside of the drainage area to the small pond. Once this stockpile was removed to reclaim the site, it left a small disturbed site which did not drain to the hay bales. In order to correct this problem, the company commits to channeling the runoff from the 0.2 acres to the drainage with the hay bales. Additional hay bales may be used if needed. We request that a three week extension be graated for this work, until Aug 16, 1991. The hay bales are firmly anchored in the drainage. The drainage