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Mr. Philip Solseng, P.E. -Change Order No. 3 -Modifications to the Approved Construction Documents <br />October 22, 2007 <br />Page 2 of 2 <br />Replacing three feet of course drain aggregate in the downstream blanket drain with a total of six <br />feet of fine filter aggregate. This modification was originally proposed in the design submittal. <br />4. The cast-in-place intake structure will be modified to a pre-cast structure to accelerate the <br />construction schedule. <br />Based on our review of the Change Order as presented in your letter dated October 17, 2007, we <br />find that the proposed changes and modifications acceptable and approved effective as of the date of this <br />letter with the following comment: <br />This office is not in favor of using sandstone for riprap protection along the upstream slope of the <br />dam. However, the prevailing winds aze away from the upstream slope and the addition of the <br />riprap is an improvement over the existing conditions (no erosion protection). The owner should <br />be made awaze that the use of this material may require increased maintenance to ensure that the <br />upstream slope is adequately protected. <br />Please inform the general contractor of this change to the approved construction documents. All <br />revisions to the approved plans and specifications as a result of this design change should be made on the <br />construction documents prior to submitting the "As-Constructed" documents to our office at the <br />completion of the project. <br />If you have any questions concerning this matter, please do not hesitate to contact Paul Perri in our <br />Denver office at (303) 866-3585 ext. 8274. We look forward to our continual work with you on this <br />construction project and to achieving a successful completion of this modification project. <br />Sincerely, <br />~~~~~~~- <br />~Jack G. Byers, P.E. <br />Deputy State Engineer <br />xc: Wayne Schieldt, Division Engineer <br />Mazk Haynes, Chief of Dam Safety <br />Paul Perri, Design Review Engineer <br />Jason Wazd, Dam Safety Engineer <br />Phil Schmidt, Mountain Coal Company, L.L.C <br />Willy Kistler, Minnesota Canal and Reservoir Co. <br />Jim Norfleet, Consulting Engineer for the Minnesota Canal and Reservoir Co. <br />H:VNOnument\07oct 12monumnetC02.doc <br />