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Mansfield Development August 7, 1984 Pape -3- to whether this is adequate for the weather patterns orhich exist in this area of Colorado. The O:,ering, Wurth a Associates report (Reference 2) concludes that "The williams Canyon basin may be slightly imparted durinc, the mining of the amendment area from the standpoint of peak storm runoff." They also indicate that "The impact of. this minino on the overall drainage basin in concluded tc be negli- aible." Based on our review, it appears that the primary area of concert. in relationship to the Cave of the winds property will be the deposition of sediment and silt which i.s washed from the ruarry area during a large storm event. This type cf deposition could affect or r?sult in road maintenance for the scenic drive of Cave of the Winds in williams Canyon. Significant silt/sediment deposition could also affect (destroy) ~~egetation in the stream channels. Since previous application i review, it is not known what proposed Phase 4) area will Conditions in Williams Canyon. basin and similar facilities operation also. formation was unavailable for our impact the northeast corner (now have on siltation and/or drainage It is our hope that a siltation are proposed for this area of Rockfall/Spillage: Spillage of quarried rock has occurred at the Snyder Ouarry in the past. This spillage is documented in a report key Mark A. Heifner dated July 11, 1989 (Reference 4). In this report it is concluded that rock spillage occurred probably in late 1987 or. early 1988, from the Phase 1 area of the Snyder puatry. This report concludes that it is estimated that about 100 to 7.00 tons of rock was spilled from the quarry by a bulldozer. One rock, which is estimated by Mark Heifner to weigh between 5 and 10 tons, is reported to be located about 50 feet on the Cage of the Winds property. All of the other rocks •and resulting damage to the slope below the Phase 1 area of the puatry are reported to be within Castle Concrete property. Review of the map of the spill- age and location of isolated rocks, prepared by Mark Heifner, indicates that the damaged slope has been mapped within 20 feet of the Cave of the Winds property. It i5 GCI's understanding tF.at the west permit boundary property lines in the area of the spill were located by inspection of aerial photographs and topographic maps. It i.s not known whether the property corner which exists along the west permit boundary was located and used to plot the slope damage and spillage. If this property corner was not staked and located, then a).1 information was plotted by review of aerial photographs and :h'J ..,w::2-~. _-v ' CV4J ! L".~11I '-!7i ~. I~~ N -~.. _- .-~ ~-