Illinois Bureau of Water Environmental P.O. Box 19276 Protection Agency Springfield, IL 62794-9276 October 2004 IEPA/BOW/04-009 DUTCHMAN CREEK TMDL REPORT A D D 02 RAM Buncombe 2 0 D D A Vienna Printed on Recycled Paper THIS PAGE INTENTIONALLY LEFT BLANK v FINAL REPORT THIS PAGE INTENTIONALLY LEFT BLANK Parameter changes for developing TMDLs In May 2001, Illinois EPA entered into a contract with Camp Dresser & McKee Inc. to develop Total Maximum Daily Loads (TMDLs) for Dutchman Creek (ADD01), Dutchman Creek (ADD02) and Dutchman Lake. In the 1998 Section 303(d) List, Dutchman Creek (ADD01) was listed as impaired for the parameters of phosphorus and nitrogen; Dutchman Creek (ADD02) was listed for low dissolved oxygen (DO), flow alterations, and other habitat alterations; Dutchman Lake was listed for nitrogen, siltation, DO, total suspended solids (TSS), noxious aquatic plants, excessive algal growth, and chlorophyll-a. Illinois EPA has since determined that at this time TMDLs will only be developed for those parameters with numeric water quality standards. These numeric water quality standards will serve as the target endpoints for TMDL development and provide a greater degree of clarity and certainty about the TMDL and implementation plans. As a result, a TMDL will not be developed for Dutchman Creek (ADD01) at this time. TMDLs for Dutchman Creek (ADD02) and Dutchman Lake will only focus on low DO, for which a numeric water quality standard exists. Causes of impairment not based on numeric water quality standards will be assigned a lower priority for TMDL development. Pending the development of numeric water quality standards for these parameters, as may be proposed by the Agency and adopted by the Illinois Pollution Control Board, Illinois EPA will continue to work toward improving water quality throughout the state by promoting and administering existing programs and working toward creating new methods for treating these potential causes of impairment. v 1 FINAL REPORT Parameter changes for developing TMDLs THIS PAGE INTENTIONALLY LEFT BLANK 2 v FINAL REPORT Contents Executive Summary Section 1 Goals and Objectives for Dutchman Creek Watershed (ILADD01) 1.1 Total Maximum Daily Load (TMDL) Overview............................................. 1-1 1.2 TMDL Goals and Objectives for Dutchman Creek Watershed....................... 1-2 1.3 Report Overview.............................................................................................. 1-3 Section 2 Dutchman Creek Watershed Description 2.1 Dutchman Creek Watershed Overview ........................................................... 2-1 2.2 Stream Segment Site Reconnaissance of Dutchman Creek Watershed........... 2-1 2.3 Lake Segment Site Reconnaissance of Dutchman Creek Watershed .............. 2-2 Section 3 Public Participation and Involvement 3.1 Dutchman Creek Watershed Public Participation and Involvement................ 3-1 Section 4 Dutchman Creek Watershed Water Quality Standards 4.1 Illinois Water Quality Standards...................................................................... 4-1 4.2 Designated Uses............................................................................................... 4-1 4.3 Illinois Water Quality Standards...................................................................... 4-1 4.3.1 Phosphorus......................................................................................... 4-2 4.3.2 Dissolved Oxygen.............................................................................. 4-2 4.3.3 Parameters without Water Quality Standards.................................... 4-2 4.4 Pollution Sources............................................................................................. 4-2 4.4.1 Agriculture ......................................................................................... 4-3 4.4.2 Contaminated Sediments ................................................................... 4-3 4.4.3 Urban Runoff/Storm Sewers.............................................................. 4-3 Section 5 Dutchman Creek Watershed Data Review 5.1 Existing Data Review ...................................................................................... 5-1 5.1.1 Mapping Data.....................................................................................5-1 5.1.2 Topography Data............................................................................... 5-1 5.1.3 Flow Data........................................................................................... 5-2 5.1.4 Precipitation, Temperature, and Evaporation Data............................ 5-3 5.1.5 Water Quality Data ............................................................................ 5-4 5.1.5.1 Dutchman Lake Water Quality Data................................ 5-4 5.1.5.1.1 DO................................................................. 5-5 5.1.5.1.2 Total Phosphorous........................................ 5-6 5.1.5.1.3 Chlorophyll "a"............................................. 5-6 5.1.5.1.4 Tributary Data............................................... 5-7 5.1.5.2 Dutchman Creek Water Quality Data.............................. 5-7 5.1.5.2.1 DO and Total Organic Carbon...................... 5-7 v i FINAL REPORT Table of Contents Development of Total Maximum Daily Loads and Implementation Plans for Target Watersheds Final Report Dutchman Creek Watershed (ILADD01) 5.1.6 Land Use............................................................................................ 5-8 5.1.7 Point Sources, Dairies, and Animal Confinement Operations........... 5-9 5.1.8 Soil Data...........................................................................................5-10 5.1.9 Cropping Practices........................................................................... 5-10 5.1.10 Reservoir Characteristics ................................................................. 5-11 5.1.11 Septic Systems ................................................................................. 5-11 5.1.12 Aerial Photography.......................................................................... 5-11 Section 6 Methodologies and Models to Complete TMDLs for the Dutchman Creek Watershed 6.1 Set Endpoints for TMDLs................................................................................ 6-1 6.2 Methodologies and Models to Assess TMDL Endpoints ................................ 6-1 6.2.1 Watershed Models............................................................................. 6-2 6.2.1.1 Watershed Model Recommendation................................ 6-5 6.2.2 Receiving Water Quality Models....................................................... 6-5 6.2.2.1 Receiving Water Model Recommendation...................... 6-6 6.2.3 Dutchman Lake TMDL...................................................................... 6-7 6.2.4 Stream TMDL for the Dutchman Creek Watershed.......................... 6-7 6.2.5 Calibration and Validation of Models................................................ 6-7 6.2.6 Seasonal Variation............................................................................. 6-8 6.2.7 Allocation........................................................................................... 6-8 6.2.8 Implementation and Monitoring ........................................................ 6-9 Section 7 Model Development for Dutchman Lake 7.1 Basis for DO TMDL ........................................................................................ 7-1 7.2 Model Overview.............................................................................................. 7-1 7.3 Model Development and Inputs....................................................................... 7-2 7.3.1 Watershed Delineation....................................................................... 7-2 7.3.2 GWLF Inputs..................................................................................... 7-2 7.3.2.1 Transport Data File .......................................................... 7-3 7.3.2.1.1 Land Use....................................................... 7-3 7.3.2.1.2 Land Use Area .............................................. 7-4 7.3.2.1.3 Curve Number.............................................. 7-4 7.3.2.1.4 KLSCP.......................................................... 7-4 7.3.2.1.5 Erosivity Coefficient..................................... 7-7 7.3.2.1.6 Evapotranspiration (ET) Cover Coefficient .................................................... 7-7 7.3.2.1.7 Recession Constant....................................... 7-7 7.3.2.1.8 Seepage Constant.......................................... 7-7 7.3.2.1.9 Sediment Delivery Ratio............................... 7-7 7.3.2.2 Nutrient Data File ............................................................ 7-8 ii v FINAL REPORT Table of Contents Development of Total Maximum Daily Loads and Implementation Plans for Target Watersheds Final Report Dutchman Creek Watershed (ILADD01) 7.3.2.3 Weather Data File ............................................................ 7-9 7.3.3 BATHTUB Inputs.............................................................................. 7-9 7.3.3.1 Global Inputs.................................................................. 7-10 7.3.3.2 Reservoir Segment Inputs.............................................. 7-10 7.3.3.3 Tributary Inputs............................................................. 7-10 7.4 Model Calibration and Verification..............................................................