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III IIIIIIIIIIIIIIII <br />999 <br />E\H1BIT 14 <br />• HYDROLOGIC MONITORING PLAN -FOIDEL CREEK LIFE OF MINE PERMIT <br />~.;.: <br />T++•entymile Coal Company will conduct a comprehensive program of hydrologic monitoring throughout the period <br />of underground mining operations. This monitoring program is designed to detect changes in hydrologic balance <br />and to define the effects of mining and subsidence on bedrock, alluvial and stream hydrologic s}•stems. Monitoring <br />data collected from the Foidel Creek Mine and adjacent areas will be permanently recorded and filed at the <br />company offices. This data will be reported to the Division of Minerals R Geolog}• (DMG) in the form of an <br />annual report as required. Reporting of effluent water quality will be made in the Discharge Monitoring Reports <br />and ++ill be submitted [o the Colorado Department of Public Health and Environment, Water Quality Control <br />Division and to [he DMG in accordance with the NPDES Permits. The Annual Hydrologic Monitoring Report will <br />be submitted to DMG by February 28 of each year. It will interpret the previous water year's data and long tens <br />trends for the potentially affected area. <br />The plan for hydrologic monitoring consists of nine basic components: <br />1. Bedrock ground water monitoring <br />2. Alluvial ground water monitoring <br />3. Surface water monitoring <br />4. Effluent monitoring (NPDES sites) <br />5. Sprang monitoring <br />6. Mine discharge monitoring <br />7. Mine inflow monitoring <br />8. Mine discharge impact monitoring <br />Designated monitoring sites are listed in Table 1, Hydrologic Monitoring Sites and are located on Map 13A, <br />'tilvdrologic Monitoring Plan. Frequency for monitoring is also shown in Table A. The parameter lists for the <br />~, ianous monitoring components are shown in Table B, Hydrologic Monitoring Parameter List. <br />Measurement of field parameters (temperature, specific conductance and pH) will be taken using standard <br />instrumentation, which will be periodically calibrated to ensure accuracy. Water quality samples will be preserved <br />according to accepted procedures and samples will be delivered to the laboratory within the accepted holding times. <br />All water samples will be analyzed by a qualified laboratory using standard EPA measurement methods and ASTM <br />test procedures. <br />Bedrock and Alluvial Ground Water Monitoring <br />Ground water monitoring will be conducted to detect the effects of mining on ground water quality and quantih•. <br />Ground water will be monitored in [he Foidel Creek Mine Permit Area with [he bedrock and alluvial wells listed in <br />Table A, Hydrologic Monitoring Sites. The locations of the wells are depicted on Map 13A, Hydrologic <br />Monitoring Plan. <br />Bedrock and alluvial ground water monitoring will consist of water level measurements, field water quality <br />readings and periodic collection of water quality samples from the selected bedrock and alluvial monitoring wells. <br />Bedrock aquifers to be monitored will be the Wadge Overburden, the Twentymile Sandstone and the Trout Creek <br />Sandstone. Alluvial aquifers to be monitored are located along Fish, Foidel, Middle, and Trout Creeks. Additional <br />data from well transects at the AVF areas of Foidel and Fish Creek have been previously submitted in the permit <br />application for Colorado Yampa Coal Company's Mine 3, Permit C-84-062, and the information is presented in <br />Exhibit 42b. <br />"•lost of the bedrock wells are scheduled to be monitored on a semiannual basis for both water IeveUfield readings <br />~ ` .d full suite analyses. Alluvial wells, except 008-AV-l, are sampled monthly for water level and field parameters <br />TR99-32 Exhl4.l APPROVETi rt° C' g ~0~0 1/03/00 <br />