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Colowyo Coal Company, L.P. <br />573 t State Highway 13 <br />Meeker, Colorado 81641 <br />(970)824-1532 <br />(970) 824-1598 FAX <br />C. CRELLIN SCOTT <br />SR. ENVIItONMENTAL ENGINEER <br />March 28, 2003 <br />Mr. Byron Walker, P. E. <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />~~/~ Kennecott <br />®~ Energ-y <br />COIOQ~OCOG~CO111~0flyL.rP~ C) <br />RECEIVED <br />APR 0 12003 <br />Bluisian of Minerals an/ f~lEp(~ <br />RE: Response to the CDMG Letter Dated March 11, 2003„Regarding the Blast Event of <br />February 16, 2003. Permit No. C-81-019. <br />Dear Mr. Walker: <br />Thank you for your letter dated March 11, 2003, requesting a review of the Division's <br />reconstruction of the blast event dated February 16, 2003. Colowyo has completed a thorough <br />review of the blast reconstruction for accuracy, completeness, and assumptions relating to this <br />specific blast event. <br />The reconstruction was completed using the Division's spreadsheet, to verify calculations. In <br />addition, assumptions relating to pattern spacing, materials, delays, and other pertinent <br />information were reviewed for accuracy and correctness. <br />Colowyo's review of the reconstruction is attached, see "Blast Reconstruction Comments." A <br />table has been provided for an overview of the different interpretations of the blast record and <br />analysis. Following the table are the specific comments addressing the different elements of <br />the blast event. <br />In summary, Colowyo has a slightly different interpretation of the reconstruction using the scaled <br />distance equation for reconstruction and has provided those differences herein. <br />As in our last correspondence, Colowyo hopes that the State finds leniency in this matter, <br />acknowledging that performance compliance was achieved at the Ott's ranch house. If we can <br />provide you with more information regarding this incident please contact me at (970) 824-1532. <br />Sincerely, <br />~ ~~~~~ <br />C. Crellin Scott <br />Sr. Environmental Engineer <br />C: file w/attachment <br />