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J. E. STOVER & ASSOCIATES <br />2768 COMPASS DRIVE, SUITE 101 <br />GRAND JUNCTION, COLORADO 81506 <br />PHONE: (970) 245-4101, FAX 242-7908 <br />hnNE 6NGINEPRING <br />MIIVE RECLAMA710N <br />November 2, 1999 <br />Dan T. Mathews <br />Division of Minerals and Geology <br />2148 Broadway, #CS <br />Grand Junction, CO 81503 <br />Re: Powderhorn Coal Company <br />Roadside Portals (Permit No. C-81-041) <br />Annual Hydrology Reports 1997 and 1998 <br />NOV CV-99-013 <br />Deaz Mr. Mathews: <br />iii iiiiiiiiiiiii iii <br />999 <br />C[Vn, FNGINEBtQdG <br />CONSC. ALINAGEf~9+Nr <br />~~~:~I` .... <br />"'' NOV - 4 1999 <br />' :i <br />,, <br />OIIt,OF Ar11.hERA~S 8 GF OGY <br />GRANlS JUN~C71.~ ' <br />The DMG's letter dated October 18, 1999 transmitted its adequacy review of the 1997 and 1998 <br />Annual Hydrology Reports (AHR). An enforcement action was taken due to the extent of missing <br />data. On behalf of Powderhom Coal Company, following are its responses to the DMG's adequacy <br />review: <br />1997 AHR <br />1) The DMG indicates field parameters were not included in the monitoring data for U17. <br />piezometers 02 and 04. Data page GD-12 submitted with the 1997 AHR did include field <br />parameters except temperature. Enclosed is an updated page GD-12 which includes all <br />required monitoring data for the U'IZ, piezometers for the 1997, 1998 and 1999 water years. <br />Monitoring of the Rollins wells includes quarterly depth to water, annual field and the Gst of <br />parameters in permit Table 18-3. The field parameters were missing in the 1997 report. <br />However, the 1998 AHR summarized the monitoring data for all four wells from June 1997 <br />to present on pages GE-1 ~J GE-4. These summary sheets provided the field parameters for <br />the 1997 water year. The page numbering got a little mixed up with the 1998 AHR. Pages <br />GE-1 ~J GE-4 should be numbered GE-6 ~ GE-9. Data page GE-1 presents the quarterly <br />depth to water for all four wells. Enclosed are updated data pages GE-1 and GE-6 ~J GE-9. <br />These data pages provide complete monitoring data for the Rollins wells for the period June <br />1997 through the 1999 water yeaz. <br />2) Enclosed is a revised data page GC-5 on which the date on column four was changed from <br />11/15/97 to 11/15/96. <br />