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~ • • III IIIIIIIIIIIII III <br />' ~~~°~~ STATE OF COLOiv~9v <br />.~ <br />8 ~ Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION ~ <br />DAVID C. SHELTON, Director <br />July 22, 1987 <br />Ms. Kathleen G. Welt <br />Environmental Specialist <br />Colorado Westmoreland, Inc. <br />P.O. Box 1299 <br />Paonia, Colorado 81428 <br />Re: Orchard Valley Mine - 1986 Annual Hydrology and Subsidence Report - <br />File No. C-83-038 <br />Dear Ms. Welt: <br />Jim Pendleton, Brent Anderson, and I have finished our review of the <br />Orchard Valley Mine Annual Report for hydrology and subsidence. With respect <br />to hydrology there were no significant changes in water quantity or quality as <br />compared to previous years data for the various surface and ground water sites <br />monitored. Brent and I were very pleased with the hydrologic data reported <br />and the effort put forth in compiling this information. We offer the <br />following recommendations for presentation of information in future AHR's. <br />Recommendations for Future Annual Hydrology Reports <br />1. Hydrologic data reported in table form should be supplemented by <br />graphical presentation of several years of record. You may choose to <br />plot several years of data already available plus the year of record or <br />begin with the year of record and leave a vacant space for future years <br />data. The end result will be a continuous graph of hydrologic <br />parameter(s) that will allow for an easy determination of variation from <br />year to year. <br />Because of the large number of hydrologic monitoring sites at the <br />Orchard Valley Mine Colorado Westmoreland, Inc. may wish to choose <br />representative sites of stream, spring, and ground water monitoring for <br />graphical presentation. <br />2. Graphical presentations should include the following parameters: flow or <br />water level, TDS, pH, and total iron. <br />3. Statistical analysis of the current hydrologic data set should be done to <br />provide minimum, maximum and mean value for the given year and historic <br />minimum, maximum and mean. Parameters included in the analysis should <br />include, but not be limited to, flow or water level, pH, TDS, and total <br />iron. Water quality parameters that have exceeded the material damage <br />standard either during the current year or past years should be included. <br />4. A hydrologic monitoring map locating all sites should be contained in the <br />AHR. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />