Laserfiche WebLink
Grand Junction Concrete Pipe Company <br />AN EQUAL OPPORTUNITY EMPLOYER <br />2311 River Road • P.O. Box 1849 • Grand Junction, Colorado 81502 <br />August 20, 2008 <br />Mr. Ken Jacobson <br />Chief, Colorado West Regulatory Branch <br />US Army Corps of Engineers <br />400 Rood Avenue, Room 142 <br />Grand Junction, CO 81501-2358 <br />RE: Soaring Eagle Gravel Pit <br />Dear Mr. Jacobson: <br />• 970/245-93.1 • FAX 970/243-6703 <br />.a$ <br />d <br />4. ?A <br />Before high water this spring, Grand Junction Pipe constructed an earthen dike along a <br />portion of the north side and along the west side of the excavated area of the Soaring <br />Eagle Gravel Pit to prevent runoff from entering the pit. The dike prevented the runoff <br />from entering the pit along a portion of the west side in a stockpile area this spring. <br />In order to continue mining along the east side of the pit, the Division of Reclamation, <br />Mining and Safety want a dike constructed to keep the 100-year flow event out of the pit <br />and to prevent capture by the river before the inlet structure is designed and built. Before <br />we can construct the remaining portion of the dike along the north side of the pit, the <br />Division wants a letter from the Corps stating they have no issues with the dike <br />construction. <br />The dike will be constructed 12 feet wide on top with 3 to 1 slopes and a height of 2 feet <br />above the 100-year event. Estimated height is three to five feet above the existing ground. <br />Western Water and Land conducted several HEC-RAS simulations to investigate the <br />influence of the dike on the stage elevations and found that the maximum increase would <br />be less than one foot during the 100-year event. See letter dated July 24, 2008 on the <br />Conceptual Design: Soaring Eagle Gravel Pit Fish Inlet and Outlet. <br />There are no wetland located within the area of proposed dike construction or where the <br />existing dike was constructed. These areas were cleared by Mike Klish of Westwater <br />Engineering and approved by the Corps during the original permitting process. These <br />studies are in the original permit file. <br />Enclosed is a map showing the location of the existing dike and the location of the <br />proposed dike.