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III IIIIIIIIIIIII III <br />999 <br /> STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY _ <br /> <br />Oepanment of Natural Resources pF' CO <br />~; ro <br /> ~ <br />b <br />~ <br /> <br />1313 Sherman St., Room 215 ti <br />0 <br />~ <br />Denver, CO 80201 . <br />~,,,,~ , <br />Phone: 17071 866-3567 ' /e S6 <br />FA%:13031 832-81 06 <br /> HnY Humrr <br /> <br />September 28, 1993 Gnv~•mur <br /> Muharl8 Long <br /> Uim von f)ireaur <br />Mr. Larry Reschke <br />Roadside 6 Cameo Mine <br />Powderhorn Coal Co. <br />P. O. Hox 1430 <br />Palisade, CO 81526 <br />RE: Roadside & Cameo Hine C-81-041 <br />Surface Water Sampling of the Colorado River <br />Dear Mr. Reschke, <br />In the permit renewal 02 process, Powderhorn Coal Company agreed to continue <br />monitoring of the Colorado River. The information was to be included in the next <br />Annual Hydrologic Report. <br />The Division conferred with staff members ae to the sampling method in the <br />Colorado River. The general consensus seems to be what significance does the <br />Roadside and Cameo discharge inputs have to the Colorado River overall. In other <br />words, Powderhorn should be able to provide the Division with the volume of flow <br />of the river so we know what percentage of flow is being adding to the river. <br />This information is available from the USGS slightly upstream of the mine, <br />possibly the irrigation canal diversion. Other parameters we feel would be of <br />use to assess the impacts to the river are EC and pH. This data may be obtained <br />from USGS or other possible sources upstream of the mine would determine assess <br />impacts. <br />A consideration in all of this is the accuracy of measurement by the laboratory <br />or instrumentation. If the lab's accuracy ie +~- 108 but the additional salt <br />load to the river is <0.18 basically any sampling would be insignificant. <br />The Division requests from Powderhorn the low flow of the Colorado River, EC, and <br />pH, the source (USGS, CDOH), and the location of sampling to be included in the <br />next Annual Hydrologic Report. <br />If you have any questions or need additional information, please do not hesitate <br />to call. <br />Sincerely, <br />~. <br />Erica S. Crosby <br />Reclamation Specialist <br />m:\coal\esc\roadside\930928 <br />.. ~- .~, <br />