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Golder Associates <br /> aCONSULTING GEOTECHNICAL AND MINING ENGINEERS RECEIVED <br /> September 14, 1984 SEP 18 1984 <br /> MINED LAND RECLAMATION DIVISION <br /> Mined Land Reclamation Division <br /> Colo. Dept. of Natural Resources <br /> 1313 Sherman Street <br /> Denver, Colorado 80203 <br /> Attention: Mr. Jim Herron <br /> Reclamation Specialist <br /> Reference: File No. C-017-81 <br /> Technical Revision - Disposal of Coal Processing Waste <br /> at the Rock Tunnel Waste Disposal Area <br /> Mid-Continent Resources, Inc. <br /> Gentlemen: <br /> Enclosed please find the revisions and additions to our design of the <br /> rock tunnel waste disposal facility. With reference to your letter of <br /> August 23, 1984 to Mr. Doug Bowman of Mid-Continent Resources concern- <br /> ing the above-referenced project, we have addressed stipulations No. 10 <br /> and 11 . Stipulation No. 10 has been addressed by showing on the con- <br /> struction drawings the route of the natural subdrain existing below the <br /> pile as observed prior to construction, and inclusion of calculations <br /> in the report to show that this natural subdrain is adequate to handle <br /> the anticipated flow from the sump. Stipulation No. 11 has been ad- <br /> dressed by sloping the top of the pile, during construction, to the <br /> south into the hillslope. Directing runoff in this manner increases <br /> the runoff flow to be carried by the east runoff collection ditch; <br /> calculations to be included in the report call for this ditch to be <br /> enlarged from that in the original design. These changes are also <br /> included in the construction drawings. <br /> We have provided only the sheets to be added or substituted into the <br /> report. Your existing report copies should be updated according to the <br /> following: <br /> 1 ) Substitute new sheets 9a through 11 for old sheets 9 through <br /> 11 , showing calculations for the road and east runoff collec- <br /> tion ditches; <br /> 2) Substitute new sheets 1 through 3, showing calculations for <br /> the drainage sump, for old sheet 1 ; <br /> 3) Substitute new construction drawing sheets 2, 3, and 4 of 5 <br /> for old ones. <br /> GOLDER ASSOCIATES,INC -17301 W COLFAX AVENUE,SUITE 275,GOLDEN(DENVER),COLORADO 80401 U S A -TELEPHONE(303)278-8662 <br /> OFFICES IN CANADA-UNITED STATES-UNITED KINGDOM-AUSTRALIA <br />