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<br />R~chartl D. Lamm <br />Governor <br />DATE <br />999 <br />DEPARTMENT OF NATURAL RESOURCES <br />Dantl H. Getches. Executive Director <br />MINED LAND RECLAMATION DI\ <br />DAVID C. SHELTO N, Director <br />May 19, 1986 <br />Hydra <br />T0: Jeff Deckler ;- <br />FROM: Dale Plume <br />RE: REVISED REVIEW OF COAL RIDGE N0. 1 MINE AHR (1985) <br />The following is a list of questions relating to observations concerning <br />anomalous data and missing data in the 1985 Annual Hydrology Report. <br />1. We11 OW-4L is missing field parameters for 8/22/85, where are these? <br />2. OW-4L is missing bicarbonate and alkalinity measurements for <br />12/18/85, where are these? <br />3. OW-4L has metals arsenic, cadmium, iron, manganese, and molybdenum <br />that exceed various regulatory standards, please explain. <br />4. OW-4L and other wells may have detection limits set too high for <br />parameters such as molybdenum, arsenic, mercury, and cadmium, etc., <br />please correct. <br />5. OW-4L has high SOq levels sometimes exceeding baseline, please <br />explain. <br />6. OW-8 water quality gets poorer (TDS, SOq), exceeding PDWS <br />regulatory parameters in 9/25 - 12/18/85 sampling periods; levels <br />double to triple previous periods, please explain. <br />7. Well OW-11 seems to be affected by river stage; consequently, is <br />probably affected by downward leaching and upward remobilization of <br />salts (NaCI), and may indicate an area of poor irrigation <br />potential; please verify if this is correct. <br />8. Well OW-14 may be indicating dispersal of SOq (from Mancos <br />Shale?) in rock tunnel spoil (tailings) that is being used to pave <br />roads. Additionally, an extremely high nitrate content is present <br />in samples (from blast residue?); could this also be caused by use <br />of spoil for roadbase? This may be from fertilizer residue, <br />however, used in agricultural applications on fields near the <br />mine. Please determine if this is occurring and what steps will be <br />taken to correct it. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />