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OTETRATECH <br />Mr. Mike Refer <br />April 27, 2012 <br />Page 2 <br />elevations 5035 and 5039. The final managed water surface elevation in the wetlands mitigation <br />area is dependent on the final grading as needed for the required acreage in the 404 permit. The <br />final water surface elevation will be lower than the minimum ground surface elevation of the <br />subject property. <br />The Agridrain will be connected to a wetwell with a capacity of 8,000 gallons with a depth of 10 <br />feet. The wetwell will have a submersible pump with a 1000 gpm pump rate. The total <br />anticipated head required for the pump is approximately 10 feet. A ten -inch force main, <br />approximately 700 feet in length, will convey flow from the wetwell to First Creek diversion <br />structure. The preliminary design is attached. <br />Aggregate Industries will coordinate with Xcel Energy on a high pressure gas line crossing and <br />access to the Fulton Ditch prescriptive easement.. <br />Please call Jeff Butson at 303-772-5282 if you any questions or comments. <br />Sincerely, <br />TETRA TECH <br />*JeBP.E., CFM <br />Gary Linden, P.G. <br />Attachments: Preliminary Design Plans C-101 through C-104 <br />P 123514'1133-23514-120030m\Letter to DBMS docx <br />