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~~' , of ~oLo ~~~ I IIIIIIIIIIIIII ~~ ~_ _- :e~," ~ 999 COLORADO ~~'~ Richard D. Lamm Governor October 25, 1982 DEPARTMENT * Igg6 ~ OF 1°IEALTH Frank A. Traylor. M.D. Executive Director Rode Orel] DEC 1 1982 Environmental Supervisor Perms Resources Corporation MINED LAND RECLAMATION P.0. Box 2679 Colo. Dept. of Natural Resources Colorado Springs, Colorado 80901 RE: Chimney Rock Coal Permit C-11,240 - Modification Dear Mr. Orell: In accordance with our telephone conversation last week, I am writing to brief you of the following: Our modeling of the permit as submitted (haul roads controlled by watering) shows that the ambient air quality standards will. be exceeded by 40 ug/m3. Additional studies based upon using chemical adhesives on the haul roads to control emissions re- sults in an impact of 140 ug/m3. These values are to be com- _ pared to the 24-hour particulate standard (150 ug/m3) assuming the background concentration to be 75 ug/m3. An extensive evaluation of the operations to be covered by the permit suggest that chemical control of the haul roads would be the most efficient and cost effective method to keep concentration levels below the standard. We would, therefore, like to include haul road stabilization by chemicals as a condition to be observed on the permit. This, of course, would be con- tingent upon your approval and would become part of your control plan to reduce emissions. Enclosed are some figures on the costs and coverages of various chemical stabilizers to help you with your decision concerning controls. Please let me know if this meets with your approval so I can conclude the processing of this permit. An additional extension of ten (1'0) days may be necessary to make this revision. 'Ro,l ll.~.c~ vtr s..~,: s / / l20"!~ ERJI '/S ~~3 firRr ~jeav.c ~'OO~33~~_u5oa 4210 EAST 11TH AVENUE DENVER,COLORADO 80220 PHONE (303) 320-8333