Laserfiche WebLink
~~ <br />~; t. <br />:i 3 <br />~~~' <br />STGTE OE COLC x%.00 od .~<opp ~<V~I i".e ~~o~ <br />DEPARTMENI'OF NaTU RaL RESOURCES . <br />D. Monte Pascoe. E.ec ut~ve Director <br />11II\'ED LA\D RCCLA~ZATION <br />423 Centennial Building. 1313 Sherman Street <br />Denver, Colorado 80203 7e 1. (303) 866-3567 <br />David C. Shelton <br />January 7, 1982 DireDtof <br />TO: F1ike Savage \ \ (~ <br />FROI.1: ~ Jim Pendleton <br />RE: Utah Znternat'~nar' Supplemental Submittals Concerning <br />Overburden Swe Factor and Ash f:'aste Disposal Plans <br />Pursuant to your request, I have reviewed the supplemental materials <br />subrv tted by Utah International, referenced above. I forward the <br />following comments For your consideration. <br />Overburden Swe1I Factor <br />The applicant presents a justification for its assumed overburden swell <br />factor of 25 e, based upon a comparison of dragline bucket capacity <br />versus the average volume excavated per swing 'of each dragline. Fortun- <br />ately, this method assumes the "rated struck bucket size" capacity - <br />will be achieved on.average by the dragline and excavating material. <br />This assumption appears to be uncrarranted. <br />The applicant wi1I have to verify their assumed overburden swell factor <br />through more traditional and reliable methods. Survey and comparison of <br />a representative reclaimed previously-mined portion of the Trapper mine <br />could accomplish this task, since pre-Wining topography and coal <br />quantities extracted should be knoern by the company. Failing such a <br />demonstration, I recommend that we stipulate the performance of this <br />'exercise annually for several years following issuance of the permanent <br />program permit. <br />t .: <br />Utility Haste Disposal _ <br />The applicant has failed to respond to the concerns expressed in my memo <br />to you dated :JOVember 9, 1981. However, utilizing information presented <br />within the applicant's proposed justification for overburden swell factors <br />allows us to perform some relatively simple projections. :heir document <br />presents volumes of overburden excavated on a monthly basis for an <br />operational period of 34 months. Their original permit application (page <br />3-49) lists minimum and maximum overburden thicF:nesses and an apparent <br />average coal thickness. Further, their permit application projects an <br />annual utility waste volume (page •1-28). <br />