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... <br />!!v11D-CONTINENT RESOURCES, INC. <br />625 PLAINFIELO ROAD -SUITE 220 <br />WILLOWBROO K, ILLINOIS 60521 <br />MID-CONTINENT RESOURCES, INC. <br />PRODUCERS OF THE FAMOUS COAL BASIN COKING COAL <br />BOX 158 <br />CARBONDALE, COLORADO 81623 <br />June 17, 1987 <br />TELEPHONE <br />(3031963-2581 <br />TWX <br />910 929 6894 <br />TLX <br />46-0724 <br />Ms_ Candace Thompson "~'" '~ ~ - _ <br />-~-: <br />Hydrologist ~ ? - - <br />Mined Land Reclamation <br />113 Sherman Stryeet, Room 4~3 .il;' ;; :.' ;?~~ <br />Denver, C^ 30i;.f..~-tc7'> <br />.. a ...-. ~_.. . ` ~...~ 1 <br />Re: TR-U8, Sutey Expansion, File No_ C-$1-Q17 _ ..°"~a <br />Dear Ms. Thompson: <br />The following discussion is in r-espouse to your <br />adequacy review litter dated May 13, 2987. <br />The location of the new pond, intake, vegetation <br />reference area and topsail piles have been accurately shown <br />on Map 2 of ?. <br />Cutoff collars will not be used far the new sediment <br />pond because we are planning to use the existing 48" CMR <br />that now runs under the road for the diversion ditch. In <br />other words, the new pond will be built around this culvert. <br />This culvert has been in existence for several years and has <br />shown that it does not leak around the outside of the pipe. <br />The snow runoff index used in the USLE was obtained <br />from the boob:, "Applied Hydrology and Sedimentology for <br />Disturbed Areas", 1981, Barfield, Warner and Haan, page 31b. <br />This factor .takes into account the effect of spring thaws. <br />The factor PD_~., i s precipitation i n i nches from December to <br />May. F used precipitation data for the last 14 years to <br />obtain our PD_,.,_ Due to our sometimes large spring runoff, <br />all new ponds and ditches in Coal Basin will be designed <br />with this factor. <br />From Map 2 of ~, Drainage Area III is shown as an <br />outslope of the final pile configuration. As you will note, <br />all runoff from this area will flow down the slope to the <br />West Collection Ditch. The 1% arrow was drawn in the wrong <br />direction for Areas VI and VII. It should be drawn to the <br />west and has been changed on Map ~ of Z. Runoff Area VI <br />will flow down the outslope to the edge of Runoff Area VII. <br />Then runoff from both areas will flow westward to the West <br />Collection Ditch. Therefore, no new runoff will flow t^ the <br />East Collection Ditch and the existing ponds. <br />• <br />~~-.. - - <br />~ r <br />.. .: t <br />~, w. _ <br />