Shamokin Creek Watershed TMDL Prepared for: Bureau of Watershed Conservation Pennsylvania Department of Environmental Protection Prepared by: Pottsville District Mining Office Bureau of District Mining Operations, Pa. DEP In Cooperation with The Susquehanna River Basin Commission March 2, 2001 TABLE OF CONTENTS ACKNOWLEDGEMENTS ............................................................................................................ 1 INTRODUCTION........................................................................................................................... 2 DIRECTIONS TO THE SHAMOKIN CREEK WATERSHED.................................................... 3 SEGMENTS ADDRESSED IN THIS TMDL................................................................................ 3 WATERSHED BACKGROUND................................................................................................... 4 TMDL ENDPOINTS ...................................................................................................................... 7 COMPUTATIONAL METHODOLOGY ...................................................................................... 8 HYDROLOGY................................................................................................................................ 9 TMDLS BY SEGMENT...............................................................................................................10 Mid Valley Discharge ............................................................................................................... 11 Margin of Safety.................................................................................................................... 12 Seasonal Variation................................................................................................................. 12 Critical Conditions ................................................................................................................ 12 North Branch Shamokin Creek ................................................................................................. 12 Margin of Safety.................................................................................................................... 14 Seasonal Variation................................................................................................................. 14 Critical Conditions ................................................................................................................ 14 Shamokin Creek Between NB1 and SC1.................................................................................. 14 Margin of Safety.................................................................................................................... 16 Seasonal Variation................................................................................................................. 16 Critical Conditions ................................................................................................................ 16 Locust Creek ............................................................................................................................. 16 Excelsior Mine Strip Pit Overflow Discharge........................................................................... 16 Margin of Safety.................................................................................................................... 17 Seasonal Variation................................................................................................................. 17 Critical Conditions ................................................................................................................ 18 Corbin Water Level Tunnel Discharge ..................................................................................... 18 Margin of Safety.................................................................................................................... 19 Seasonal Variation................................................................................................................. 19 Critical Conditions ................................................................................................................ 19 Scott Ridge Mine Tunnel Discharge ......................................................................................... 19 Margin of Safety.................................................................................................................... 20 Seasonal Variation................................................................................................................. 21 Critical Conditions ................................................................................................................ 21 Colbert Mine Breach Discharge................................................................................................ 21 Margin of Safety.................................................................................................................... 22 Seasonal Variation................................................................................................................. 22 Critical Conditions ................................................................................................................ 22 Maysville Mine Borehole Discharge......................................................................................... 22 Margin of Safety.................................................................................................................... 24 Seasonal Variation................................................................................................................. 24 Critical Conditions ................................................................................................................ 24 Quaker Run Above QR1 ...........................................................................................................24 Margin of Safety.................................................................................................................... 26 i Seasonal Variation................................................................................................................. 26 Critical Conditions ................................................................................................................ 27 Big Mountain Discharge ........................................................................................................... 27 Margin of Safety.................................................................................................................... 28 Seasonal Variation................................................................................................................. 28 Critical Conditions ................................................................................................................ 28 Shamokin Creek Between SC1 and SC2................................................................................... 28 Margin of Safety.................................................................................................................... 30 Seasonal Variation................................................................................................................. 30 Critical Conditions ................................................................................................................ 30 Royal Oak Discharge ................................................................................................................ 30 Margin of Safety.................................................................................................................... 31 Seasonal Variation................................................................................................................. 31 Critical Conditions ................................................................................................................ 31 Henry Clay Stirling Slope Discharge........................................................................................ 32 Margin of Safety.................................................................................................................... 33 Seasonal Variation................................................................................................................. 33 Critical Conditions ................................................................................................................ 33 Carbon Run Above CAR1......................................................................................................... 33 Margin of Safety.................................................................................................................... 35 Seasonal Variation................................................................................................................. 35 Critical Conditions ................................................................................................................ 35 Coal Creek Above CLR1 ..........................................................................................................35 Shamokin Creek Between SC2 and SC3................................................................................... 36 Margin of Safety.................................................................................................................... 37 Seasonal Variation................................................................................................................. 37 Critical