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J W. W. Wheeler and Associates, Inc. <br />1 Water Resources Engineers <br />August 6, 2001 <br />Mr. Bryce Romig <br />Climax Molybdenum Company, Climax Mine <br />Highway 91/Fremont Pass <br />Climax, CO 80429 <br />Re: #1051.18c Climax Mine <br />Robinson Lake Seepwater <br />Return System <br />Final Certification <br />Dear Bryce: <br />The purpose of this letter is to certify that the modifications made to the <br />Robinson Lake seepwater collection and return system were completed in general <br />conformance with the drawings and specifications. The project design was <br />reviewed and accepted by the Colorado Division of Minerals and Geology as part of <br />the Environmental Protection Plan TR -07, Climax Mine Reclamation Permit Number <br />M -77 -493. The construction of the modifications were substantially completed in <br />the fall of 2000 by Schmueser and Associates. The undersigned conducted <br />periodic site inspections during the construction of the project and Climax personnel <br />performed daily inspections. <br />Minor adjustments were made to the design of the project as construction <br />progressed and site conditions dictated. These modifications are reflected on the <br />enclosed As- Constructed drawing set (11"x 17 "). The most significant <br />modifications to the project included the following: <br />1. Due to unstable, saturated soils located along the back side of the new <br />pond, the decision was made to install riprap slope protection over the entire <br />back side of the pond. The original design called for riprap only in the inflow <br />channel. <br />3700 South Inca Street Englewood, Colorado 80110 (303) 761 -4130 FAX (303) 761 -2802 <br />