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-- III IIIIIIIIIIIIIIII DIVISION OF MINERALS AND GEOLOGY Dcparnnenl u( Naluml Retinurccs 141 1 Sherman $L, Room ? I i Denver, Colorado H0201 Phonr'. 151111 RL6-75h7 October 14, 1997 Mr. Michael G. Altavilla Seneca Coal Company P.O. Drawer D Hayden, CO 81639 RE: Seneca II Mine (C-80-005) 1996 Annual Hydrology Report & Annual Reclamation Report Deaz Mr. Altavilla, II~~~ DEPARTMEtYT OF NATURAL RESOURCES Roy Romer Governor larnr~$ Luchhrad E~etmive Dlrcua! Michael B Lang Divivun Direcun The Division received the 1996 Annual Hydrology Report (AHR.) and Annua! Reclamation Report (ARR) on March 3, 1997 and Apri14, 1997, respectively. The ARR was submitted and is in compliance with Rule 2.04.13. In Tab 13, Seneca is required to submit the as-built designs for stock tanks constructed during the reporting year. There appeaz to be a number of stock tanks that were constructed in 1996, and completed in 1997 that require as-built certifications. Please provide the Division a copy of the stock tank certifications constructed in 1996 and completed in 1997. The AHR was found to be adequate and well-written. The Division agrees with the conclusion and fords that the water data for 1996 substantiate the predictions in the Probable Hydrologic Consequences of the petntit. The Division has the following relevant comments regazding the AHR; The Division agrees with the interpretation of the groundwater levels and that they follow the predictions in the permit. It will be interesting to note how long it actually takes water with higher total dissolved solids to migrate downgradient in the Cow Creek alluvium and show up in well S69A. Currently, the TDS in S69A appears to be decreasing white that in the upgradient well, S46A, is increasing. STATE OF COLORADO 3. The PHC predicted TDS in Fish Creek below Cow Camp and Bond Creeks to maeimize at about 600 mg/I. This prediction held in 1996, as the water in Fish Creek below the confluence of these two tributazies ranged from 570 to X97 mg/I.