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... <br /> <br />iii iiiiiiiiniu iii ~ <br />STATE OF COLORADO <br />*~`~`~~/w Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director G <br />DATE: September 28, 1987 <br />T0: Karen Hellner <br />~~ <br />FROM: Cathy Begej t-~ <br />RE: SECOND QUARTER; 1987 SURFACE WATER MONITORING, FOIDEL CREEK MINE, <br />C-82-056 <br />I have reviewed the surface water data submitted by Twentymile Coal Company <br />for compliance with the Hydrologic Monitoring Plan and analytical quality <br />assurance as I discussed with you earlier: There are three monitoring plans <br />in effect during the 1987 water year: <br />Exhibit 10 Foidel Creek Permit Application; Submitted 12/1/83, <br />Effective 6/21/83. <br />Exhibit 14 Foidel Creek Permit Application; Submitted 10/85, <br />Effective 12/22/86: <br />Exhibit 14R Revised Exhibit 14 from T:R: No: 3; Submitted <br />2/18/87; Effective 4/5/87: <br />The latter exhibit was used to ascertain compliance with the program: You <br />might send the operator these three plans to ensure that he understands his <br />commitments; as the First Quarter, 1987; data submittal showed some omissions. <br />The only outstanding omission I found in this submittal was a failure to <br />provide flow for the mine inflow discharge site, No. 109. I did see this data <br />during the last complete, so it has been collected: Please request that the <br />operator include it in the future: <br />I examined two facets of the analytical results: conductivity and mass balance <br />calculations. The operator appears to have been verifying field conductivity <br />values with laboratory evaluations on a random basis: Given historical <br />problems with field conductivity values and the rigors of field sampling, the <br />operator should be commended and encouraged to continue this practice. Major <br />discrepancies between the field and laboratory values show up approximately <br />ten percent of the time: Mass balance determinations on six random samples <br />showed a major surplus in cations on 6/16/87 during Colorado Mined Land <br />Reclamation bivision's hydrology inspection: This sampling was in excess of <br />that required by the HMP for this quarter: The operator should advise the <br />laboratory to re-analyze those samples; if this is not possible; I would <br />recommend that the operator eliminate this data from the data base, since it <br />was an "extra" sample: <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />