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800 W.8th Street <br /> Pueblo,Colorado 8 <br /> (719)582-558-5588 <br /> www.j esi k.u s <br /> INTRODUCTION <br /> This surface water management report was prepared to provide a plan to keep surface water quality <br /> and quantity leaving the site at levels at least what historical records show prior to the proposed <br /> development. <br /> Historically, drainage systems have been viewed with various perspectives. During different time <br /> periods and in different locations, drainage has been considered a vital natural resource, a <br /> convenient cleansing mechanism, a flooding concern, and a nuisance wastewater. Generally, <br /> climate, topography, geology, scientific knowledge, engineering and construction capabilities, <br /> societal values, religious beliefs, and other factors have influenced the local perspective of <br /> drainage.For as long as humans have been building, these factors have guided and constrained the <br /> development drainage solutions. <br /> Ancient drainage systems constructed by several civilizations, most notably the Indus, Minoan, <br /> Persians,Egyptians,Etruscan,Hittites, Greeks, and Chinese were well-planned.Preceding, during, <br /> and shortly after the Roman Empire significant drainage technological advances were introduced. <br /> Drainage in the early parts of the twentieth century was firmly established as a vital public works <br /> system. Engineers continued to improve design concepts and methods. During the second half of <br /> the twentieth century regulatory elements were promulgated in the United States, Europe, and <br /> other locations addressing drainage issues. Extensive monitoring efforts vastly improved the <br /> understanding of drainage quantity and quality characteristics. Computer modeling tools advanced <br /> the methods used to design and analyze drainage systems. Regulations, monitoring, computer <br /> modeling, and environmental concerns have altered the perspective of drainage from a public <br /> health and nuisance flooding concern during the first half of the twentieth century into a public <br /> health and nuisance flooding with additional concerns for ecosystem protection and sustainability. <br /> The stormwater management facilities, flows, and characteristics for this project were developed <br /> and designed using Fremont County and State of Colorado Regulations, state of the art computer <br /> software, and current engineering principles and practices in the area. <br /> EXECUTIVE SUMMARY <br /> Pre-development and post-development stormwater runoff rates were determined in this analysis <br /> using Fremont County drainage regulations. The site is divided into 3 areas: offsite stormwater, <br /> operations (adit, plant, and maintenance), and the laydown/stockpile areas. <br /> A detention pond will be constructed at the north side of the stockpile areas to detain water for <br /> up to about 8-hours and reduce stormwater release rates from the entire project to pre- <br /> development rates. There will not be an increase in 10-year and 100-year stormwater release <br /> rates from this project. <br /> N <br /> Three (3) stormwater channels are proposed for the project. The Offsite Stormwater Diversion o <br /> Channel will direct water running towards the project around the tailings and operations area and <br /> co <br /> into a natural drainage. This channel will be a permanent channel to divert water from the FTSF. <br /> Dawson Mine Surface Water <br />