MAHANOY CREEK WATERSHED TMDL Columbia, Northumberland and Schuylkill Counties
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MAHANOY CREEK WATERSHED TMDL Columbia, Northumberland and Schuylkill Counties Prepared for: Pennsylvania Department of Environmental Protection March 13, 2007 TABLE OF CONTENTS INTRODUCTION........................................................................................................................................... 1 LOCATION .................................................................................................................................................... 2 SEGMENTS ADDRESSED IN THIS TMDL................................................................................................... 3 CLEAN WATER ACT REQUIREMENTS....................................................................................................... 3 SECTION 303(D) LISTING PROCESS ......................................................................................................... 4 BASIC STEPS FOR DETERMINING A TMDL ..............................................................................................5 WATERSHED BACKGROUND..................................................................................................................... 5 Permits in the Mahanoy Creek Watershed ................................................................................. 6 TMDL ENDPOINTS....................................................................................................................................... 7 TMDL ELEMENTS (WLA, LA, MOS)............................................................................................................. 7 TMDL ALLOCATIONS SUMMARY ............................................................................................................... 8 RECOMMENDATIONS ............................................................................................................................... 14 PUBLIC PARTICIPATION ........................................................................................................................... 25 REFERENCES............................................................................................................................................ 26 Commenter: Citizens for Pennsylvania’s Future....................................................................80 TABLES Table 1. Mahanoy Creek Segments Addressed .......................................................................... 1 Table 2. NPDES permits associated with mining permits requiring waste load allocations (WLAs) in the Mahanoy Creek Watershed .................................................................................... 6 Table 3. NPDES permits not associated with mining permits requiring waste load allocations (WLAs) in the Mahanoy Creek Watershed .................................................................................... 7 Table 3. Applicable Water Quality Criteria................................................................................ 7 Table 5. Mahanoy Creek Watershed Summary Table................................................................... 8 ATTACHMENTS Attachment A. Mahanoy Creek Watershed Maps.......................................................................27 Attachment B. Excerpts Justifying Changes Between the 1996, 1998, Draft 2000 and Draft 2002 Section 303(d) Lists ...................................................................................31 Attachment C. AMD Methodology and the pH Method.............................................................33 Attachment D. TMDLs By Segment...........................................................................................36 Attachment E. Flow Adjusted Concentration Method…………………………………………55 Attachment F. Water Quality Data Used in TMDL Calculations...............................................57 Attachment G. Iterative Aluminum Reductions for Gilberton Pump Discharge ........................77 Attachment H. Comment and Response .....................................................................................79 i TMDL1 Mahanoy Creek Watershed Columbia, Northumberland and Schuylkill Counties, Pennsylvania INTRODUCTION This Total Maximum Daily Load (TMDL) calculation has been prepared for segments in the Mahanoy Creek Watershed (Attachment A). It was done to address the impairments noted on the 1996, 1998, and draft 2002 Pennsylvania Section 303(d) lists and the 2000 305(b) report required under the Clean Water Act. The TMDL covers five segments on these lists (Table 1). High levels of metals, and in some areas depressed pH, caused these impairments. All impairments resulted from acid drainage from coal mining. The TMDL addresses the three primary metals (iron, manganese, and aluminum) associated with acid mine drainage (AMD) and pH. Table 1. Mahanoy Creek Segments Addressed State Water Plan (SWP) Subbasin: 06-B Susquehanna River EPA DEP Segment Stream Designated Data 305(b) Year Miles Stream Source ID Name Use Source Cause Code Code 1996 52.2 Not 17556 Mahanoy WWF 305(b) RE Metals placed on Creek Report GIS 1998 26.07 2227 17556 Mahanoy WWF SWMP AMD Metals Creek 1998 27.59 2228 17556 Mahanoy WWF SWMP AMD Metals Creek 2000 26.1 2227 17556 Mahanoy WWF SWMP AMD Metals Creek 2000 27.6 2228 17556 Mahanoy WWF SWMP AMD Metals Creek 2002 11.1 20000808- 17556 Mahanoy WWF SWAP AMD Metals 1500- Creek MAF 2002 21.6 20000810- 17556 Mahanoy WWF SWAP AMD Metals 1530- Creek MAF 2002 6.6 20010629- 17556 Mahanoy WWF SWAP AMD Metals 1230- Creek MAF 2002 12.8 20010820- 17556 Mahanoy WWF SWAP AMD Metals, 1200- Creek pH MAF 2002 2.3 20010820- 17556 Mahanoy WWF SWAP AMD Water/Flow 1201- Creek Variability, MAF pH 1 Pennsylvania’s 1996 and 1998 Section 303(d) lists were approved by the U.S. Environmental Protection Agency (USEPA). The 2000 Section 303(d) list was not required by USEPA. The 1996 Section 303(d) list provides the basis for measuring progress under the 1996 lawsuit settlement of American Littoral Society and Public Interest Group of Pennsylvania v. EPA. 1 State Water Plan (SWP) Subbasin: 06-B Susquehanna River EPA DEP Segment Stream Designated Data 305(b) Year Miles Stream Source ID Name Use Source Cause Code Code 2002 2 20010820- 17556 Mahanoy WWF SWAP AMD Water/ 1501- Creek Flow MAF Variability 2002 7.7 2227 17556 Mahanoy WWF SWAP AMD Metals Creek 1996 5 Not 17683 Shenandoah CWF 305(b) RE Metals placed on Creek Report GIS 1998 4.66 2240 17683 Shenandoah CWF SWMP AMD Metals Creek 2000 4.67 2240 17683 Shenandoah CWF SWMP AMD Metals Creek 2002 4.7 2240 17683 Shenandoah CWF SWAP AMD Metals Creek 1996 Not currently on 303(d) List Unt. Mahanoy Creek 1998 Not currently on 303(d) List Unt. Mahanoy Creek 2000 Not currently on 303(d) List Unt. Mahanoy Creek 2002 2.3 20010629- 17673 Unt. CWF SWAP AMD Metals, 0930- Mahanoy Siltation MAF Creek 1996 5.8 Not 17639 Zerbe Run CWF 305(b) RE Metals placed on Report GIS 1998 4.82 7087 17639 Zerbe Run CWF SWMP AMD Metals 2000 4.83 7087 17639 Zerbe Run CWF SWMP AMD Metals 2002 7.7 20000809- 17639 Zerbe Run CWF SWAP AMD Metals, 1430- pH MAF Attachment B includes a justification of differences between the 1996, 1998, draft 2000 and draft 2002 303(d) lists. WWF = Warm Water Fishes CWF = Cold Water Fishes RE = Resource Extraction AMD = Abandoned Mine Drainage SWMP = Surface Water Monitoring Program SWAP = Surface Water Assessment Program LOCATION The Mahanoy Creek Watershed is approximately 157 square miles in area. It is located in portions of Columbia, Northumberland and Schuylkill Counties, with its mouth located about 10 miles south of Sunbury, Pennsylvania. Mahanoy Creek flows 50 miles west from its headwaters near Mahanoy City, Schuylkill County, to its confluence with the Susquehanna 2 River, near Herndon, Northumberland County. Mahanoy Creek can be accessed from Interstate 81 by traveling west on State Route 901. SEGMENTS ADDRESSED IN THIS TMDL The Mahanoy Creek Watershed is affected by pollution from AMD. This pollution has caused high levels of metals in Mahanoy Creek, Shenandoah Creek, an unnamed tributary to Mahanoy Creek near Lavelle and Zerbe Run. Low pH affects Zerbe Run and Mahanoy Creek upstream of Gordon. There are numerous seeps, boreholes and tunnel discharges entering Mahanoy Creek throughout most of the watershed. The unnamed tributary to Mahanoy Creek is affected by AMD from a discharge in its headwaters. Zerbe Run is mostly affected by AMD discharges from the North Franklin Mine. Shenandoah Creek receives AMD from the abandoned Weston and Hammond Mines. CLEAN WATER ACT REQUIREMENTS Section 303(d) of the 1972 Clean Water Act requires states, territories, and authorized tribes to establish water quality standards. The water quality standards identify the uses for each waterbody and the scientific criteria needed to support that use. Uses can include designations for drinking water supply, contact recreation (swimming), and aquatic life support. Minimum goals set by the Clean Water Act require that all waters be “fishable” and “swimmable.” Additionally, the federal Clean Water Act and the U.S. Environmental Protection Agency’s (USEPA) implementing regulations (40 CFR 130) require: • States to develop lists of impaired waters for which current pollution controls are not stringent enough to meet water quality standards (the list is used to determine which streams need TMDLs); • States to establish priority rankings for waters on the lists based on severity of pollution and the designated use of the waterbody; states must also identify those waters for which TMDLs will be developed and a schedule for development; • States to submit