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?. - <br />III IIIIIIIIIIIIIIII <br />~ Twent}rmile Coal Company <br />April 11, 1996 <br />Mr. Kent Gorham <br />Environmental Protection Specialist <br />29515 Routt County Road p27 <br />Oak Creek, CO 80467 <br />Phone (303) 879-3800 <br />~ry.z,,-~-sr..~~.. <br />R1=r~niFD <br />ApR ~ 6 1ss6 <br />Division of Minerals & Geology 41visl0ti of Minorale & 4t~olci~Y <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: 1994 Annual Hydrology Renort Review Response. Foidel Creek Mine. # C-82-056 <br />Dear Mr. Gorham: <br />The following are responses to issues and comments regarding the above-referenced report as per your <br />letter of 31 July 1995. <br />1993 AHR Review. Outstandiu Ig sues <br />Please review your file for the Division's letter of December 19, 1994 concerning the conversion of <br />pressure readings to depth for the 1993 data and respond as appropriate. <br />Response: From review of the referenced document and previous documents referenced therein, it <br />appears that submitted data for pressurized well readings was misreported in some instances in the 1993 <br />AHR. In the event that a pressure reading is recorded, the appropriate handling of the data is to multiply <br />the pressure reading (psi) by 2.31 (ft/psi) to obtain the height of the static water level above the datum <br />point (ft). This height is entered in the database as a negative number which when subtracted from the <br />datum, as is the convention for all well level readings, provides a static water level above the datum <br />elevation. <br />Revised Figures 1 and 2 for Appendix B of the 1993 AHR are provided with this submittal along with <br />Tables IA, 8A, and 8B. The tables provide water level and elevation data for welts GWB-1, GWB-2 and <br />GWB-2R and comprise the data used to create the revised Figures. The tables are to be inserted behind <br />Tables 1 and 8 respectively in Appendix B of the 1993 AHR. Data is provided for the period October <br />1992 through December 1993 as the original figures covered this time frame. <br />Erroneous pressure conversion data was also evident for wells FBR-11-A and 001-83-107. As the <br />erroneous data had been utilized in creating the plots for both the 1994 and 1995 AHR's, corrected Figures <br />are provided for all three reports. For well 001-83-107, Figure 4 (footnoted I:\SPREADSH\AHR\TCC\ <br />TCCFIG4.RV2) should replace the original Figure 4 submitted with the 1993 AHR.. Figure 16 (footnoted <br />I:\SPREADSH\AI-IR\TCC\ TCCFIG4.REV) should replace the original Figure 16 submitted with the 1994 <br />AHR. Lastly, Figure l6 (header WL183107 Chart 3) should replace the original Figure l6 submitted with <br />i:~documrn/ W vVoidel.ckltccalv.ltr <br />