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`';r <br />~r <br />~~~ I~~I~~!~~IIII II~ <br />ST~~ ~`E OF COLORADO ~ <br />MINED LAND RECLAMATION DIVI~IOR <br />Department of Natural Resources of ~D~ <br />e <br />~~`°,~ <br /> <br />7373 Sherman S;.. Room 275 <br />nver <br />D <br />CO 80203 % <br />N r.<~ .~ <br />~~----~~ <br />'7 <br />1: <br />: <br />~ <br />, <br />e <br />303 a66-3567 . <br />~, <br />~c <br />~• 'rsr 6~• <br />FAX~303 832-8106 <br />Ro+ RamC <br />Goverro <br />Fretl R Banu <br />DATE: May 4, 1990 Dn•ttron Drrp~or <br />T0: Tom Gillis <br />FROM: Dan t4athews / <br />RE: Powderhorn Coal Company (C-81-041) Report - Evaluation of Test Dlot <br />Vegetation on Coal Waste Piles: Roadside Mine ppr7~, i <br />General <br />I have reviewed the above report prepared by Western Resource De7relopment <br />Corporation for Powderhorn Coal Company and viewed the refuse pile <br />reveaetation and test plots during my April inspection. The 7969 report was <br />based on soil and vegetation studies performed in the summer of 1988. The <br />purpose of the investigations was, in part, to respond to Certain concerns <br />raised by the Division in regard to Drevious test plot evaluations performed <br />in 1986. <br />The overall objective of the test plot study is to evaluate the effect of <br />various cover soil depths, in combination with slope aspect, to determine the <br />cover soil depth necessary to meet reveaetation success standards on coal <br />waste disposal areas at the Roadside and Cameo Mines. It is anticipated that <br />Powderhorn will be submitting a technical revision application to allow for <br />replacement of less than 4 feet of cover soil for both the Roadside and Camec <br />waste disposal areas in the future. <br />Vegetation Observations <br />The table below provides a brief synopsis of the relationship between cover <br />soil depth and vegetation parameters of concern. For purposes of comparison, <br />Shadscale Saltbush reference area values are as follows: <br />Reference Area Yalues <br />Total Vegetation Cover 31 .6a <br />Herbaceous Production 193 lb/ac <br />Cheatarass Cover 10.6 <br />Cheatarass Production 108 lb/ac <br />Woody Density Standard 800 stems/acre <br />