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<br />lead to exposure of the pier piling or caissons, Evaluating the scour potential can lead to <br />recommendations for preventing additional erosion protection for existing structures, For new <br />bridges, it is important to determine scour depth for design of the foundation system, <br />Methods used for determining scour include the Federal Highway Administration's Hydraulic <br />Engineering Circular No, 18 (Evaluating Scour at Bridges) and No, 20 ( Stream Stability at <br />Highway Structures), These methods are cunently the state-of-the-art for scour analysis at <br />bridges, <br /> <br />As an example of our bridge scour analysis capabilities, we are recently worked for CDOT on <br />an analysis of the Saint Vrain Creek as it crosses under 1-25 near Longmont High <br />floodwaters created unstable banks that allow the creek to approach the bridge at a sharp <br />angle, Resulting turbulence created scour holes that in places have removed as much as ten <br />feet of depth of the original channel bottom, This has exposed the pier caps, and in the case of <br />the frontage road bridge, actually lead to the failure of one entire pier of the multi-span bridge, <br />Our hydraulic analysis resulted in design measures that will return the creek to the original <br />configuration and provide protection of the existing bridges, As a part of this study, we are <br />working with CDOT to size three new bridges to eventually replace the existing north bound, <br />south bound bridges and the frontage road bridge along the 1-25 conidoL <br /> <br />Several examples of our floodplain analysis projects are presented throughout this submittal. <br />As can be seen, ICON Engineering has a great deal of experience in completing submittals to <br />FEMA. Through our experience gained on these projects, we have noted several key issues <br />that need to be properly addressed in a timely manner in order to facilitate the completion of <br />map revisions, Our approach is geared towards addressing these issues, <br /> <br />We feel we are particularly well qualified to complete Floodplain Analysis. Our experience <br />on drainage projects has ranged from a few hours of consulting, to multi-year contracts, Our <br />FEMA Map Revisions experience is without doubt the most extensive in the western United <br />States, We are recognized leaders in the design of channel stabilization projects and have <br />extensive experience in the preparation of hydraulic and hydrologic analyses conforming to <br />local Drainage Criteria, A partial list of current and recently completed projects follows: <br /> <br />E. Sub-Consultants: <br /> <br />All work completed under this contract will be completed by ICON Engineering using full <br />time personnel. No subconsultants are proposed, <br /> <br />F. Location: <br /> <br />All work for this project will be completed by our Colorado based firm using long term <br />Colorado residents, All fees generated from this project will stay in Colorado, The team will <br />complete assignments in the field, and will utilize ICON Engineering, Inc,'s Denver area <br />office as the primary work location, <br /> <br />6 <br />