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The Sear-Brown Group reviewed the 1-25 Corridor Master Drainage Plan <br />Godding Hollotiv and Tri-Town Basins South Weld Counry report and verified that <br />the hydrologic values derived within the report appear to be representative of the <br />Tri-Town Basin. From the table of hydrologic values above, the following <br />conclusions can be drawn: <br />1. The existing condition 100 year hydrology will yield the greatest amount <br />of storm water runoff that the regional detention pond will experience. <br />2. Basins 62 and 91 are mostly developed today. These basins will contribute <br />the majority of undetained storm water runoff that enters the regional <br />detention pond now and in the future. <br />3. As basins 61, 63, 92, 93, and 94 develop and utilize the current localized <br />detention pond release criteria, hydrologic contributions to the regional <br />detention pond will be reduced. <br />C. Field Investigations <br />On July 29, 1999, Kevin Gingery and Russell Dahlgren visited the Tri-Town Basin <br />to observe the basin topography, basin hydrologic features, locations and <br />conditions of existing crossings and drainageway structures, and locations of <br />adjacent residential and commercial buildings. The existing storm drainage <br />infrastructure, as noted within Figure 5 on the following page, was observed to be <br />in place as documented by Anderson Consulting Engineers, Inc., clear of debris, <br />and available to receive what storm water runoff they were capable of handling. <br />The basin topography slopes as indicated within Figure 2. Between Weld County <br />Road 13 and the communities of Frederick, Evanston, and Firestone, the <br />abandoned Union Pacific Railroad embankment exists. The railroad tracks have <br />been removed, but large quantities of earthen embankment remain. The existing <br />Tri-Town Drainageway is located between the railroad embank.ment and the <br />residential homes. The Tri-Town Drainageway varies in shape, depth, and side <br />slopes along the communities of Frederick, Evanston, and Firestone. Upstream <br />(south) of Frederick, the Tri-Town Drainagway is not well defined as it traverses <br />existin� farm land upstream to State Highway 52. The Tri-Town Drainageway <br />does no� continue upstream of State Highway 52. It appears from the preliminary <br />design presented later in this report that excess earthen soil is available from the <br />proposed regional detention pond site to construct the regional detention pond <br />embankment. Other construction materials such as riprap and concrete will need <br />to be imported to the project site. <br />13 <br />