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<br />~II'I~II~II~'I~I II~ <br />C c~~us <br />"`~ Yampa Valley <br />November 10, 1993 <br />Kent Gorham <br />Reclamation Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />303-879-3800 <br />RECEIVED <br />NOV 15 1993 <br />Ci:•rcr^ ct i.~,ner~lg ~ i=uclonv <br />Re: Decrease in Freguencv of Accelerated Water Level Monitoring, <br />Select Fish Creek AVF Alluvial and Shallow Groundwater Wells; <br />Permit C-82-056, Foidel Creek Mine <br />Dear Mr. Gorham; <br />The attached information on well levels is being provided in <br />conjunction with TCC's plan for decreased monitoring frequency for <br />the wells currently being monitored on an accelerated schedule. <br />As noted in our previous telephone conversation, the monitoring <br />plan for the FCAVF wells recommends accelerated sampling at a daily <br />interval for wells affected by drastic changes in water level. In <br />the event no such changes in water level are observed, then the <br />normal schedule outlined in Exhibit 14 applies. TCC wishes to <br />stress that the footnote on the Exhibit 14 page RECOMMENDS daily <br />sampling, rather than requires daily sampling. <br />As can be seen from the attached well level information, only well <br />GWB-2 has exhibited a drastic change in water level. Daily <br />monitoring of this well commenced on October 18 and has been <br />conducted on a daily basis since that time. In addition, TCC has <br />also monitored wells GWA-6, GWAP-7, GWAP-5, GWB-1, GWA-2, and GWAP- <br />4 on a daily basis since that time as a voluntary measure to gain <br />a better understanding of this hydrologic system. Wells GWAP-7 and <br />GWB-1 have also displayed minor dewatering effects, but this would <br />be expected during localized dewatering of the shallow bedrock <br />aquifer. In the case of GWAP-7, the slight decline in water <br />elevations observed is likely the result of the localized <br />dewatering of the shallow bedrock unit which feeds the immediately <br />adjacent seep FCS-1. At this time the levels in well GWAP-7 have <br />stabilized. <br />Well GWB-1 has also shown a slight decline in water levels, but <br />this decline is of such a slow rate that an increase in sampling <br />interval would not be expected to significantly affect the tracking <br />of water level fluctuations in this well. <br />