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iiiiiiiiiiiiiiuhi • • <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenl of Natural Resources <br />1713 Sherman 51., Room 215 Ily~~~ <br />Dem~er, Colorado 80203 I <br />Phone: 13071 866-3567 <br />FAY: 13031 83_'-8106 <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Ro}' Romer <br />Governur <br />lame. S Lochhead <br />Execulrve DurUUr <br />Michael B. Long <br />TO: Erica Crosby 3 October 1997 o~s~nn Director <br />FROM: Jim Burnell <br />SUBJ: Review of Sen a II Annual Hydrology Report <br />The Division has reviewed Seneca Coal Company's Annual Hydrology Report for the 1996 <br />water year. In general, we find the report adequate and well-written. The Division agrees with <br />the conclusion and finds that [he water data for 1996 substantiate the predictions in the Probable <br />Hydrologic Consequences of the permit. <br />Several particulazly relevant comments follow. <br />We agree with the interpretation of the groundwater levels and find that they follow the <br />predictions in the permit. <br />A question arose in reviewing water quality data from Spoil Spring #5. In the text, it is stated <br />that the spring water had an electrical conductivity of 6130 umhos/cm'- while the data in the <br />appendix (page B-117) indicate an electrical conductivity of--3800 umhos/cmz. It is possible <br />that we have somehow misinterpreted the tables and or the text, so please clarify. It appears that <br />an explanation of the salinity of the water from that spring could possibly be its origin from the <br />the Wadge coal seam. <br />It will be interesting to note how long it actually takes water with higher total dissolved solids to <br />migrate downgradient in the Cow Creek alluvium and show up in well S69A. Currently, the <br />TDS in S69A appeazs to be decreasing while that in the upgradient well - S46A - is increasing. <br />The PHC predicted TDS in Fish Creek below Cow Camp and Bond Creeks to maximize at about <br />600 mg/I. This prediction held in 1996, as the water in Fish Creek below the confluence of these <br />two tributaries ranged from 570 to 590 mg/I. <br />These are the only comments that azise from review of the document. <br />«, [.PK <br />