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iii iii'iiiiiiiiiii • <br />CLIMA3~ MOLYBDENUM COMPANY <br />A SuESidlery al P~eipe Dodpe Corppre[ion <br />August 14, 2000 <br />Via Hand Delivery ~~~~~~~© <br />Mr. Allen Sorenson AUG 15 2000 <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology Division of Minerals and Cealagy <br />1313 Sherman S[reet, Room 215 <br />Denver, Colorado 80203 <br />Henderson Ooeraeions <br />ao. eox se <br />Empire, Colorado 80438 <br />(3031 569-3221 <br />Fax !3031569-2830 <br />RE: 2-Dam Decent Grouting and 3-Dam Seepwater Management, Henderson Mill, <br />Technical Revision TR-09. Permit No. M-77-342 <br />Deat Mr. Sorenson: <br />This letter and other submittals are being provided to the Division of Minerals and <br />Geology (Division) per the requirements of the April 27, 2000 conditional approval <br />granted by the Division for the above mentioned technical revision. Please find enclosed <br />a construction summary of the 3-Dam decant grouting prgject from Denver Grouting, as <br />well as a materials testing report from Inter-Mountain Engineering regarding the actual <br />grout used. Also included is a letter report from Mr. Chris Hatton of URS addressing [he <br />Division's concerns regarding possible 3-Dam stability issues from the decant line <br />penetration. These three items fulfill Stipulations No. 3 and 4 from the Division's <br />conditional approval letter. However, it should be noted that some of the compressive <br />strength test results on the grout did not meet our specification. We are currently <br />addressing this concern with Denver Grouting but were unable to resolve it before this <br />submittal was due to the Division. Henderson will respond to the Division with more <br />information regarding this matter by September 30. <br />Please feel free to call if you have any questions or are in need of any further information. <br />I can be reached at (303) 569-3221 ext. 2214. <br />Very tnlly yours, <br />~/v - - - <br />Erich Bower <br />Environmental Engineer <br />Enclosures <br />Cc: Anne Beierle -Climax <br />Mike Ley -Climax <br />Ricld Wagner-Climax <br />