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Oslo <br />General Shale <br />Building The American Dreanr <br />March 1, 2017 <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St. Room 215 <br />Denver, CO 80203 <br />Attention: Mr. Peter S. Hays <br />Subject: Technical Revision to Hogback Mine M-1980-245 for Weed Control Program <br />Dear Mr. Hays: <br />General Shale Brick, Inc. (General Shale) is respectfully submitting a technical revision and fee <br />for a weed control plan for Hogback Mine. <br />General Shale has identified some or all of the following weed species: <br />Common mullein Houndstongue Musk Thistle <br />Diffuse knapweed Bull Thistle Scotch Thistle <br />Russian knapweed Canada Thistle <br />General Shale will utilize a contractor to spray the weeds. The contractor will be asked to use <br />herbicides that are not toxic to humans or animals. The herbicide used will depend on which weeds <br />are present. The mines will be sprayed on an as needed basis and!or every other year if there weeds <br />are present. If necessary the weeds will be mowed prior to the application of the herbicide. <br />Mowing, depending on the weed species present, may be used as a treatment in addition to the <br />weed spraying. <br />If you have any questions please feel free to contact me at (303) 783-3058. <br />Sincerely, <br />General Shale Brick, Inc. <br />j�;;�� <br />Jason E. McGraw F.E. <br />Mine Supervisor <br />