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• Walker to File <br />March I, 1999 <br />Page 2 of 2 Pages <br />Rule -1.06.1~(~1)(c)(iii): (Jre~uired by the Division, n wrilten inlerpretcrlinn of l6re da[cr unc/ <br />rdenlrJrccrlion ojrninrng related impnets to the hydrologic ba(crnce. <br />The report is incompliance with this rule. The Division i-eyuired no written interpretation of the <br />data, but graphs of field static water levels, pH, and specific conductance for the past ~ years (pages <br />77 through 86j and a summary of impacts (page ~3) are provided in the report. CEC reports no <br />adverse affect on the overall hydrologic balance of the Keenesburg Mine. <br />The average static water level in SMW Z appears to be recovering. This well is located in an area <br />of spoil backfi l 1, approximately 400 feet east of the south end of B Pit. The static water table at this <br />point would not be expected to fully recover until backfill of B Pit is complete. AMW 2, adjacent <br />to and down gradient of A Pit, also in an area of spoil backfill, remained dry during 1998 (report, <br />page 52). <br />Well AMW 1 is located at the northern boundary of B Pit. There has been a persistent rise in specific <br />conductance (see Enclosure 1). No baseline information was found for this well, but the base lines <br />for DH 96, another down-gradient well, ranged betvveen1700 and 2100. Other alluvial wells had <br />• values as high as 7000 (Permit, Appendix J). Total dissolved solids concentrations ranged from <br />1500 to 7000+, making the ground water mostly unsuitable even for irrigation (Permit, page 50). <br />DH 96 is the most down-gradient and most northerly of [he monitoring wells. All parameters <br />appear to be within historic ranges with no deviant trends. <br />Probable hydraulic consequences of mining are described in Appendix I of the Permit (pages 46 <br />through 48). In summary, ground water sources are not expected to be affected, and existing <br />quantities of water passing through the leasehold, once the water levels have recovered, should not <br />be significantly altered. Degradation of water quality is not expected. No trends or information <br />contradict these predictions. <br />1 Enclosure, as stated <br />CC: Dan Hernandez <br />C:\w pdoc s\ah rrvw 98.028. doc <br />• <br />