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~. <br />DEPARTMENT OF NATURAL RESOURCES <br />D Monie Pascoe E.ecuo~e Dneno~ <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON Director <br />Ricnard D Lamm <br />Go+ernor <br />T0: <br />FROM: <br />RE: <br />M E M O R A N D U M <br />January 1983 <br />Mike Savage <br />Jim Pendleton - <br />H-G's Request Red ce Frequency of Overburden Fill <br />spec 'on & Certification <br />Pursuant to your request, 1 have reviewed the request submitted by <br />Morrison-Knudsen Company, Inc., regarding modification of the inspection <br />and certification schedule for the permanent overburden spoil fill at the <br />Hayden Gulch open pit coal mine. The letter also presents the results of <br />a quarterly inspection of the fill conducted during December of 1982. At <br />the time of this inpection the fill was noted as being completely <br />constructed and reclaimed. <br />In consideriny the company's request to amend the inspection and <br />verification frequency for the fill I have examined our Spetember, 1982 <br />aerial photography of the H-G spoil pile area. I did not discern any <br />slope failures or obvious instability problems. However, the <br />northeastern facial slope continues to appear quite steep. I believe it <br />appropriate to continue surveillance of that particular portion of the <br />fill for the next several years. <br />I recommend that we approve the operator's request with the <br />following condition: The fill should be inspected in March and June of <br />this year on the original quarterly basis. This will provide inspection <br />and certification on a quarterly basis through the normal wet season of <br />next spring. Follov+in9 completion of the June, 1983 inspection and <br />certification, if no stability problems have been discerned, the operator <br />Inay commence inspecting the fill on an annual basis. The inspection <br />would be performed and certified each June, following the annual wet <br />season. (You may prefer to amend this date to fall, if it allows better <br />vegetative examination.) <br />cc: Brian Munson <br />423 Centers ni;J Dwli li nrl 1313 Shen n: u. Gln:ul IL iiv.:r +:r ,Irn,~r lip 8(.I'LUa tea ! 411:4 BFifi-fi ~ifi7 <br />