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~~ <br />t-J f <br />/w •~y; , ~ <br />~- <br />:.. /~~ <br />`~ <br />~~~~ <br />srn,eo~co~o=moo =.; ..~~.~.....:~ ;... . <br />OEPARTMENTOFNATURAIRESOURCES <br />D. Monte Pastoe. E.ec ut~ve D~rettor <br />~1INED LAND RECLAMATION <br />a23 Centennial Budding, t373 Sherman Street <br />Denver, Coloratlo 80203 Tel. (303) 666-3567 <br />David C. Shelton <br />Director <br />January 7, 1982 <br />TO: hfike Savage <br />FROFf: Jim Pendleton <br />RE: Utah Internat' War' Supplemental Submittals Concerning <br />Overburden Sweu. Factor and Ash [taste Disposal Plans <br />Pursuant to your request, I have reviewed the supplemental materials <br />submitted by Utah International, referenced above. Z forward the <br />following comments For your consideration. <br />Overburden Swell Factor <br />The applicant presents a justification for its assumed overburden swell <br />factor of 25`;, 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 unwarranted. <br />She applicant will 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 known 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 />', <br />Utility taste Disposal <br />The applicant has failed to respond to the concerns expressed in my memo <br />to you dated :/ovember 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. Their 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 thicknesses and an apparent <br />average coal thickness. Further, their permit application projects an <br />annual utility waste volume (page 4-28), <br />