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Mansfield Development August 7, 1989 Page -2- Manitou Sprinos, and especially Cave of the ~~7inds. Their analy- sis concludes that "From this analysis it can be seen that t!ie Cave of the Winds is the most likely place to be affzct.ed and the people most affected will b? the vital to~ar.ists." They- also con- r_iude that "[chat will be .r,vs*_ visible will be the wills at the back of the benches. These walls cannot be revegetated and therefore the potential exists that the visua], impact will be rather significant because of high contrast and large size, not to mention a rather different pattern and texture to the view from what is usually pereeived as forested hillsides." Although the application for the Snyder Quarry contains discus- sion about possible staining of the limestone benches to reduce the visual impact, the Snyder Quarry application does not indi- cate that this is part of the revegetation/reclamation plan. Basically, they indicate that, "studies and information gathering has begun to determine whether the visible walls ran be stained economically...". They also indicate that "Tests are planned to determine whether the staining can be applied here at a low cost with comparable benefit." Staining of the back walls of the benches •NOUId be a benefit to the Cave o: the winds to reduce the visual impact of the quarry. Accelerating the revegetationi reclamation program, for example by planting more :nature trees, irrigation, or other methods, could also reduce the visual impacts of the operation. Another method of reducing the visual impacts would be reforestation of the quarry area. M3intainirg the concurrent reclamation/revegetation program as the plan proposes would be critical to the reduction of visual impacts. The back walls and quarry disturbances in the northern portion of the ouarry facility will have permanent visual impacts on the Cave of the Winds facility. Hydrology and Drainage: The proposed amendment area lies within the willi:~ms Canyon drainage basin. Therefore, drainage flowing across disturbed land in the amendment area will ultimately drain into Williams Canyon and through the Cave of the Winds property. Th~a plan for controlling surface drainage and siltation from the amendment area is contained in a report prepared by Obeying, wurth and Associatesr dated June, 1989 (Reference 2). This re~>ort indi- cates that drainage and siltation will be controlled by a silt retention facility, silt fences, and berming within t:he ouarry amendment area. The silt facility has been sized for a 10-year design storm. The 25-year storm was used to size the ~>ilt basin outlet structure and the two access road culvert crossings of the natural drainage. The 100-year storm was used for sizing of t;1e emergency feature of the spillway for the silt retention basin (sedi*~er.t basin). The sediment hasin will, therefore, pass (wi.ti~out necessarily desilting the water) the 25-year and 1J0- year storms. Although it has been indicated that t!~e 10-year storm design is the "industry standard", there is some :lobate as