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p~y ~ECEI~~~~ IIIIIIIIIIIIIIIIIII FEB 1~ 1990 Ms. Kathy Begej Colorado Mined Land Reclamation Division Department of Natural Resources 1313 Sherman Street 215 Centennial Building Denver, CO 80203 Dear Ms. Begej: tsoo 5oum nle Flagetefl. Arizona g5ppt teoz~ naszsa r The following is a summarization of our discussion of January 26, 1990 concerning what additional monitors would be necessary to further define baseline and during mining hydrologic conditions at Peabody's Seneca II-W and Yoast properties. Seneca II-W 1. Baseline water flow and quality in the C05 pond '>w ~ (Figure 1) drainage ai the point of the proposed pond ' - is requested. If true alluvium exists within a } mile distance downstream of the pond, an alluvial monitoring well within the § mile reach is requested. P~soor cw~ cowv~Nr w.,e..o owi.i.~ ~ltlveo I_anln ~iECLAINATION ~IVISEOv February 9, 1990 I ~ ~ 2. Since baseline flow and quality data in the 009 and 010 (Figure 1) pond drainages has previously been '~' obtained, it will suffice for the permit application. "' However, if true alluvium exists within a } mile distance downstream of the ponds, alluvial monitoring wells within these § mile reaches are requested. 3. A stream monitoring station on Sage Creek below the 009 pond confluence is requested. 4. In the II-W South area, overburden, coal, and untlerburden monitoring wells for the potential Wadge, Sage Creek, and Wolf Creek pits are requested. Water level, water chemistry, and aquifer characteristics for one well completed in each unit in each of the proposed mining areas was recommended as an approach to determining the significance of these units as aquifers and the potential for vertical leakance between the units. Concerns regarding downgradient