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I I I I I I I I I I I I II ! I I I I I I Mr. Wayne Bethurum Page 4 The results of this analysis show that your proposed development will have a minor affect on the existing 100-year water surface elevations, In the worst case at cross-section 3 your development may cause a 2 inch rise in the existing 100-year water surface elevation. However, all of the proposed structures within the first phase of your development are planned to have top of foundations set at leas 1 foot above the 100-year water surface elevations. It should be pointed out that even under existing conditions storm water from an event similar to the July 31st flood will overtop Highway 138 at cross-section 3. Therefore your subdivision may not cause a rise in the water surface elevation but may slightly increase the amount of flow which would overtop the highway at this location. Wayne, Since your property is located in a floodplain and because the City of Sterling participates in the National Flood Insurance Program, your development must be in accordance with the Federal Emergency Management Agency's (FEMA) Regulations. A copy Part 60 of FEMA's criteria is enclosed with this letter for your use. As a reminder, mechanical equipment should be kept out of the crawl spaces and each crawl space should contain a sump pump that drains to adjacent ground outside of the structure's foundation. The structures should be adequately secured to the foundations to resist flotation. The sump pumps, foundations and anchors should be designed by your structural engineer. ICON Engineering has forwarded copies of this letter to the CWBC and the City of Sterling and hopes this analysis will help provide you with the necessary information to continue to make informed improvements to your property, Sincerely, neON ENGINEERING, INC %' ," ..... t- ' f I / di/ (~ Matthew J, Ursetta, P,E. Principal cc: Larry Lang Joe Kiolbasa Attachments