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III IIIIIIIIIIIII III ~ ~ STATE OF COLORADO MINED LAND RECLAMATION DIVISION of ~o~ Department of Natural Resources ~~,_. ~ C-1-- \ Nr3 ~ $ 1313 Sherman SL, Room 215 Denver CO 80203 ~ i1 , 303 866-3567 '+ra7e++ FA%:303 832-8106 Roy Romer, Gwemor Mmnael B. Long, Division Director TO: Shawn Smith, Reclamation Specialist FROM: Jeff Martin DATE: July 15, 1992 SUBJECT: Ground water hydrology at Seneca II, Peabody C-80-005 Seneca II Hvdrolooic Environment The geohydrology of the Seneca II mine is extremely complex due to lenticular sedimentary rock formations which have been folded and irregularly thickened coal seams due to differential compaction during deposition. The permit area is virtually bisected by the Tow Creek anticline, a ground water recharge area. Water entering recharge areas on the west side of the anticline moves westward and northwestward to the Hayden syncline structural low. Ground water flow on the east side of the anticline moves southward and southeastward initially along the plunging axis of the Twentymile Park syncline and eventually into the Hayden syncline. A portion of the latter mentioned ground water flow enters the Trout Creek aquifer several miles downgradient from the permit area and may resurface in Trout Creek. Surface water falling on the west and east sides of the Tow Creek anticline moves laterally to the topographically low basins of Grassy Creek and Fish Creek respectively. Peabody Monitoring at Seneca II Peabody Coals Inc. monitors a total of 43 wells in and around the Seneca II mine, 20 of which are used to determine water quality on a biannual basis (two wells had insufficient flows for sampling). Each well is monitored in full compliance with Peabody's monitoring plan. Peabody compares ground water quality at the mine site to both irrigation and livestock standards as set by the Colorado Department of Health. Ground water in the area surrounding Seneca II is not being pumped for either irrigation or stock watering. Only well GW-S5-TC, the Seneca II shop well is used for domestic purposes and as is later discussed, is not impacted by mining activities.