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Gaglliano,Frigbieenng, Inc <br />359 E. Enterprise Dr. 08 <br />Pueblo 'West, CO 81007 <br />(719) 240-9425 <br />October h, 2008 <br />Client- Summit Brick & Tile, Co. <br />P O. Box 533 <br />Pueblo, CC 81002-0533 <br />(714) 542-8278. <br />Drainage Study for Access Permit <br />I P 6 b �A Q W CE <br />Property Address, Cherokee Clay Mine <br />Lot 44 Locke Mountain Ranch Filing No. 3 <br />Fremont County, Colorado <br />Dear Sirs. <br />As requested I have prepared a drainage study for the Cherokee Clay mine Access <br />Pennit. The purpow of this drainage study is to ensure that the concrete Pan fit the Access <br />of the Cherokee Clay Mine has adequate drainage capacity. As such, this drainage study <br />will address major sub - basins, upstream and onsite drainage oonditions, water quality <br />features, as well as the drainage capacity of the ooncrctc pan. <br />Three, major drainage sub-basiris (0, A1, and A2) have been determined for the site. <br />Sub-basin 0 is the offsite (upstream) drainage area for the mine access while Sub-basins <br />Al and A2 are the onsite drainage areas for the access. Runoff frorki Sub -basin O will he <br />routed to the concrete pan via, an existing roadside drainage swale, Th upstream <br />drainage swale must be sloped in such a manner as to ensure that the stormwater runoff <br />from Sub-basin 0 will flowno;rth and across the concrete pan, Runoff from Su"Osin <br />A2 will also be routed to the concrete pan.. Runoff from Sub-basin Al will be routed to <br />and detained behind an earthen bemi located just to the northeast of the mine. access. <br />This detained runoff wil.1 be released via a weir outlet j List downstream Of the concrete <br />pan. Two design points were determined for the access and are located at the concrete <br />pan and directl downstream of the access. 'See the enclosed map for basin and design <br />point locations,. <br />The existing surfacm of Sub 0 include both uedistuebed natural land as well as the <br />graveled surface of Country Road 84 (CR-84). The surfaces of Sub-basins Al and A2 <br />i nclude natural areas, stockpiles, and graveled/unpaved areas. Natural surfaces are <br />comprised of scattered boulders and cobbles, range grasses, as well as trees and shrubs. A <br />weighted average was taken for each sub-basin in order to determine the l 0 -Year and <br />10O.Year Rurtoff CoefficienfLs- <br />Two water quality features are proposed. First, the proposed weir outlet for the earthen <br />berm is to be plated with available onsite rock/gravel, in order to ensure the water quality <br />Chwoia%­ Clay h1im Access Pamnil . Drai SI pace I of 2 RL 06 <br />lWailtage.4jec) <br />