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• <br />;- <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenl of Natural Resources <br />1313 Sherman 51.. Room 215 <br />Denver, Colorado BO203 <br />Phone: 1303) 8fifi-3567 <br />FAX: 13031 832 81 06 <br />• <br />STATE OF <br />Interoff/ice Memo <br />To: Janet Binns ~l <br />From: Kent Gorh< 1 `" <br />CC: Dan Hernandez <br />RE: 1996 and 1997 Annual Hydrology Reports <br />Mine No. 1 and Eckman Park <br />#C-81-071 <br />~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames S Lochhead <br />E%eCUlrve Dlrprl0! <br />MichaelB Long <br />Dimsion Director <br />I have completed my review of the 1996 and 1997 Annual Hydrology Report for Mine No. 1 and <br />Eckman Pazk. <br />Generally, the operator completed the required monitoring in accordance with the approved plan. <br />Report data was clearly presented and complete. However, one minor issue was noted. It appears that <br />negative reported values (which indicate below the detection limit) are being figured into the average <br />calculation. While it is appropriate to report that analysis returned a parameter value which is assumed <br />less than the detection limit for that parameter, these values should not be included in the calculation of <br />the average and standazd deviation. For an example, see Table 45A under iron, copper, and <br />molybdenum. Please correct this problem in future reports. <br />Bedrock Water Ouality <br />Wadge overburden waters are degraded due to the migration of spoil water downdip of reclaimed pit <br />areas. (See well 006-82-74C) However, we1194M001 shows no changes in quality similaz to those <br />expected by migrating spoil waters. Therefore, it would appear that ground water movement is to the <br />northeast at this location, moving generally parallel to the reclaimed pit area. <br />Bedrock Water Ouantity <br />Water levels in well 94M001 were 3-4 feet below those of previous years, even with heavy fall <br />precipitation. This would support the theory of a limited, updip rechazge area for this well. <br />Surface Water Ouality <br />Water quality upstream of the mine is affected by spoil springs, which is predicted in the probable <br />hydrologic consequence section of the permit. Discharge of spoil spring water through the sediment <br />ponds A, D, and F continue to affect the overall quality of surface waters in the immediate area. EC <br />values downstream of the Foidel/Middle Creek confluence with Trout Creek were historically 300-400 <br />unil3os/cm but are now 500-600 umhos/cm during low flow periods. A portion of this increase is due <br />to spoil springs associated with the Mine No. 1, Mine No.2 ,and Eckman Park operations. TDS levels <br />III IIIIIIIIIIIIIIII <br />COLU1tAD0 <br />