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i_ ~~~ I~~I~~I~~II~~ I~~ ~ Twentymile Coal Company April l 1, 1996 Mr. Kent Gorham Environmental Protection Specialist Division of Minerals & Geology 1313 Sherman Street, Room 2I5 Denver, CO 80203 29515 Routt County Road p27 Oak Creek, CO 80467 Phone (303) 879-3800 R~~~IVFp •.; ;: ApR 161996 DlWelan m Minorals 8 Gaoio~y RE: 1994 Annual Hydrology Report Review Response, Foidel Creek Mine, # C-82-056 Dear Mr. Gorham: The following are responses to issues and comments regarding the above-referenced report as per your letter of 31 July 1995. 1993 AHR Review. Outstanding Issues Please review your file for the Division's letter of December l9, 1994 concerning the conversion of pressure readings to depth for the 1993 data and respond as appropriate. Response: From review of the referenced document and previous documents referenced therein, it appears that submitted data for pressurized well readings was misreported in some instances in the 1993 AHR. In the event that a pressure reading is recorded, the appropriate handling of the data is to multiply the pressure reading (psi) by 2.31 (ft/psi) to obtain the height of the static water level above the datum point (ft). This height is entered in the database as a negative number which when subtracted from the datum, as is the convention for all well level readings, provides a static water level above the datum elevation. Revised Figures l and 2 for Appendix B of the 1993 AHR are provided with this submittal along with Tables IA, 8A, and 8B. The tables provide water level and elevation data for wells GWB-I, GWB-2 and GWB-2R and comprise the data used to create the revised Figures. The tables are to be inserted behind Tables 1 and 8 respectively in Appendix B of the 1993 AHR. Data is provided for the period October 1992 through December 1993 as the original figures covered this time frame. Errotieous pressure conversion data was also evident for wells FBR-I 1-A and 001-83-107. As the erroneous data had been utilized in creating the plots for both the 1994 and 1995 AHR's, corrected Figures are provided for all three reports. For well 001-83-(07, Figure 4 (footnoted 1:\SPREADSH\AHR\TCC\ TCCFIG4.RV2) should replace the original Figure 4 submitted with the 1993 AHR.. Figure 16 (footnoted I:\SPREADSHWiR\TCC\ TCCFIG4.REV) should replace the original Figure 16 submitted with the 1994 AHR. Lastly, Figure 16 (header WL183107 Chart 3) should replace the original Figure 16 submitted with is\JocumentV7hrVoidel. ekVucalv.I V