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March 29, 2018 C� TZA Water Engineers <br /> a Lamp Rynearson Company <br /> 12596 W. Bayaud Ave.,Ste.330 <br /> Lakewood,Colorado 80228 <br /> Colorado Division of Reclamation Mining& Safety [P]303.971.0030 <br /> c/o Eric Scott tza4wateccom <br /> 1313 Sherman Street, Room 215 <br /> Denver,Colorado 80203 <br /> Re: Technical Revision to Permit No.M-2017-022 <br /> Dear Eric Scott: <br /> We request a Technical Revision to Permit No. M-2017-022 which was issued for a mining project in <br /> Huerfano County with two objectives: 1) provide gravel for road construction and 2) excavate for a <br /> water storage reservoir. There are two revisions being requested: a) increased excavation due to over- <br /> excavation of the reservoir area and b)extension of the drainage Swale to better control surface runoff. <br /> Originally, we had intended there be no over-excavation of the reservoir footprint, and had estimated <br /> 163,000 CY of total excavation. We now find it prudent to over-excavate in the area where the <br /> reservoir embankment will be constructed, and the total excavation is now revised upward to 193,000 <br /> CY. This revision involves no change in the finished contours of the reservoir, its footprint, or its <br /> embankment. <br /> Originally, we had designed the drainage Swale that runs along the west side of the planned reservoir <br /> to terminate approximately 300 feet north of the existing irrigation ditch. Drainage water at that point <br /> would return to the existing grade and could enter the irrigation ditch. It was decided that it would be <br /> more prudent to extend the drainage Swale south and across the irrigation ditch (placing the irrigation <br /> ditch in a pipe under the drainage Swale). The landowner has consented to this revision. The attached <br /> Map 5 incorporates the extended drainage Swale and would supersede Map 5 in the original <br /> application. The attached Map 4 incorporates an expansion of the spoils and stockpile area to north of <br /> the existing irrigation ditch and would supersede Map 4 in the original application. <br /> These revisions will not increase the Affected Area, will not require an increase in equipment or <br /> manpower,and will not change the remediation and revegetation procedures. <br /> Please contact me if you have any questions or concerns. <br /> Sincerely, <br /> Joht/Faint. <br /> John C. Faux, P.E. <br /> Senior Project Engineer <br /> attachment <br /> LAMP RYNEARSON COMPANIES <br /> LLL <br /> LAMPRYNEARSON ��, TZAW..Ranpn.ars LARKIN AQUATICS <br /> LAMP RYNEARSON <br />