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The Loantaka Brook Watershed Report EPA Grant Number: X-97267701

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The Loantaka Brook Watershed Report EPA Grant Number: X-97267701 The Loantaka Brook Watershed Report EPA Grant Number: X-97267701 Algal blooms on Kitchell Pond, Courtesy of Google Earth website, 2005 aerial Submitted by: Ten Towns Great Swamp Watershed Committee 2 Ridgedale Avenue Suite 200 Cedar Knolls, NJ 07927 (973) 984-2000 [email protected] DUNS # 141565049 501(3)© - DLN:17053097012018 Fed Tax ID Number 22-3575281 Prepared by: Princeton Hydro, LLC Suite 1, 1108 Old York Rd. P.O. Box 720, Ringoes, NJ 08551 (908) 237-5660 [email protected] Loantaka Brook Watershed Ten Towns Great Swamp Watershed Management Committee July 2009 Table of Contents Executive Summary –......................................................................................................... 7 1.0 Introduction........................................................................................................... 10 1.1 Project Location................................................................................................ 13 1.2 Project Strategies.............................................................................................. 14 2.0 Pollutant Loading and Hydrologic Analyses (Task 1.1)....................................... 16 2.1 Modeling Methodology.................................................................................... 16 2.2 Subwatershed Determination and Land Use / Land Cover Classification........ 18 2.3 Subwatershed Hydrologic and Pollutant Loading ............................................ 19 2.3.1 Hydrologic Loading.................................................................................. 20 2.3.2 Mean Annual Nitrogen Loading ............................................................... 26 2.3.3 Mean Annual Phosphorus Loading........................................................... 36 2.3.4 Mean Annual Sediment Load ................................................................... 43 3.0 Pollutant Model Calibration - Mean Monthly Concentrations ............................. 46 4.0 Subwatershed Management Ranking Matrix........................................................ 49 5.0 Stormwater Infrastructure Inventory (TASK 1.3) .................................................. 52 5.1 Municipal Stormwater Plans, Ordinances and Mitigation Lists and Green Building Designs............................................................................................... 53 5.2 Stormwater Infrastructure Recommendations for Loantaka Brook.................. 54 5.2.1 Retrofit the Stormwater Controls for Kitchell Pond................................. 55 5.2.2 Construct a Bioretention Basin for the Seton Hackney Stables................ 55 5.2.3 Construct a Bioretention Basin for the Woodland Elementary School .... 56 5.2.4 Madison Avenue –Parson Village Detention Basin.................................. 56 5.2.5 Retrofit of the Village Drive Detention Basin .......................................... 58 5.2.6 Village Drive Ravine Recommendations.................................................. 59 5.2.7 Crum-Foster Drainage Retrofit................................................................. 60 5.3 Streambank Stabilization North of Woodland Avenue .................................... 63 6.0 Preliminary Design of an Off-Line Created Wetland........................................... 68 6.1 Wetland Project Background ............................................................................ 68 6.2 Wetland Project Objective ................................................................................ 69 6.3 Wetland Project Location ................................................................................. 69 6.4 Constructed Treatment Wetland Design........................................................... 70 6.4.1 Wetland Sizing and Configuration............................................................ 71 6.4.2 Treatment Wetland Hydraulics................................................................. 72 6.4.3 Treatment Mechanisms............................................................................. 74 6.4.4 Phosphorus Removal ................................................................................ 75 6.4.5 Operation and Maintenance...................................................................... 76 6.4.6 Design Summary....................................................................................... 76 6.4.7 Cost Estimate ............................................................................................ 77 6.4.8 Permit Requirements................................................................................. 77 7.0 Monitoring Water Quality and Biological Community Data ............................... 79 7.1 Water Quality Monitoring Methodology.......................................................... 80 7.2 In-situ Analysis Results .................................................................................... 82 7.2.1 Temperature .............................................................................................. 82 Princeton Hydro, LLC Project Number 0341.010 2 Loantaka Brook Watershed Ten Towns Great Swamp Watershed Management Committee July 2009 7.2.2 Dissolved Oxygen..................................................................................... 84 7.2.3 Specific Conductance................................................................................86 7.2.4 pH.............................................................................................................. 89 7.3 Nutrient Data Results and Discussion............................................................... 90 7.3.1 Phosphorus (Total and Soluble Reactive Phosphorus) ............................. 92 7.3.2 Nitrogen (Total Kjeldahl Nitrogen, Ammonia, Nitrate) ........................... 97 7.3.3 Total Kjeldahl Nitrogen (TKN) ................................................................ 97 7.3.4 Ammonia (NH3-N).................................................................................. 100 7.3.5 Nitrate (NO3-N) ...................................................................................... 103 7.4 Solids (Total Suspended Solids and Total Dissolved Solids)......................... 105 7.4.1 Total Suspended Solids (TSS) ................................................................ 105 7.4.2 Total Dissolved Solids (TDS)................................................................. 108 8.0 Biological Monitoring - Macroinvertebrate Community Assessment................ 111 8.1 Macroinvertebrate Methodology.................................................................... 111 8.2 Macroinvertebrate Results.............................................................................. 113 8.2.1 Primrose Brook....................................................................................... 114 8.2.2 Passaic River – Out................................................................................. 115 8.2.3 Passaic River – In.................................................................................... 116 8.2.4 Black Brook............................................................................................ 117 8.2.5 Great Brook............................................................................................. 118 8.2.6 Loantaka Brook....................................................................................... 119 9.0 Visual Habitat Assessment ................................................................................. 121 9.1 Visual Assessment Methodology.................................................................... 121 9.2 Visual Assessment Summary Results............................................................. 122 9.2.1 Primrose Brook....................................................................................... 122 9.2.2 Passaic - In.............................................................................................. 125 9.2.3 Black Brook............................................................................................ 126 9.2.4 Loantaka Brook....................................................................................... 126 9.2.5 Great Brook............................................................................................. 127 9.2.6 Passaic Out.............................................................................................. 128 10.0 Stream Discharge and Development of Ratings Curves..................................... 129 10.1 Stream Discharge Methodology ..................................................................... 129 10.2 Discharge Results............................................................................................ 130 11.0 References........................................................................................................... 132 Appendix I ...................................................................................................................... 133 Appendix II ..................................................................................................................... 139 Appendix III.................................................................................................................... 142 TABLES Table 2.1: Loantaka Brook Watershed Land Use and Area Table 4.1: Subwatershed Ranking Matrices Table 5.1: Loantaka Brook Stormwater Mitigation Projects Table 5.2: Outfall Size & Conditions North of Woodland Ave Table 6.1: Summary of Wetland Sizing and Volume Calculations Table 7.1: Ammonia Standards Princeton
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