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.~ WF~C • III IIIIIIIIIIIII III 999 1880 SOUTH AL81ON STREET • SUITE 500 • DENVER, COLORADO 80222 • (303) 757.8513 Mr. Mark Klune General Manager Valco, Inc. P. 0. Box 857 Pueblo, Colorado 81002 June 10, 198 '~~'C~I ~~ SUN 2 i 1999 R~C~MATIp~ D1DSIpIV WRC File: 1664/2 R Re: Pueblo East Pit Drainage Investigation Dear Mr. Klune: As outlined in our March 30, 1988 Proposal, on April 29, 1988, WRC completed afield investigation to assess the conditions related to the arroyo draining into the above referenced pit. The pit is located just south of U. S. Highway 50 approximately one mile east of its intersection with Colorado Highway 96 (see attached location map on Exhibit 1). Valco was interested in determining whether diverting the runoff from the arroyo into the abandoned Booth-Orchard Canal was a feasible alternative and estimating the amount of work required to do so. The purpose of the investigation was to determine: (1) the dimensions of the existing highway and railroad crossing structures upstream from the site, (2) the condition and cross section of the existing Booth-Orchard Canal which lies along the northern boundary of the pit area, and (3) hydrologic parameters necessary to estimate the peak flow from the 5-, 10-, 25-, 50-, and 100-year frequency storms using SCS Method TR-55. Survey information and photographs were obtained during our site visit. Results of the April 29, 1988 investigation follow: (1) The arroyo, which bisects the pit, crosses beneath Highway 50 through a 10 feet x 10 feet reinforced concrete box culvert. The top of the highway is 22 feet above the upstream flowline of the culvert. Two reinforced concrete box culverts, a double 7 feet x 5 feet, and a single 5 feet x 4 feet exist beneath the old railway bed just upstream from the 10 feet x 10 feet box culvert. The old railway bed is 14.5 feet above the upstream flowline of the culverts. CONSULTING ENGINEERS