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Upper Merrimack and Pemigewasset River Study Field Program Draft Data Report, New England District US Army Corps of Engineers

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Upper Merrimack and Pemigewasset River Study Field Program Draft Data Report, New England District US Army Corps of Engineers Upper Merrimack and Pemigewasset River Study Field Program 2009‐2012 DRAFT Data Report New England District – US Army Corps of Engineers September 2012 Contents Section 1 Background 1.1 Upper Merrimack and Pemigewasset River Study ............................................. 1-1 1.2 Sampling Program Overview ................................................................................. 1-2 1.2.1 Data Quality Objectives ............................................................................ 1-3 1.2.2 Study Area .................................................................................................. 1-3 1.2.3 Program Components ............................................................................... 1-6 1.2.3.1 Impoundment Studies .................................................................. 1-6 1.2.3.2 Continuous Dissolved Oxygen Monitoring .............................. 1-6 1.2.3.3 Low and High Flow Water Quality Surveys ............................. 1-7 1.2.3.4 Sediment Sampling ....................................................................... 1-8 1.3 Data Report Overview ............................................................................................. 1-8 Section 2 Impoundment Studies 2.1 Impoundment Survey 1 – June 2009 ...................................................................... 2-4 2.1.1 Event Summary ......................................................................................... 2-4 2.1.2 Precipitation and Streamflow Conditions ............................................. 2-5 2.1.3 QAPP and Field Sampling Plan Deviations .......................................... 2-7 2.2 Impoundment Survey 2 – July 2009 ....................................................................... 2-8 2.2.1 Event Summary ......................................................................................... 2-8 2.2.2 Precipitation and Streamflow Conditions ............................................. 2-9 2.2.3 QAPP and Field Sampling Plan Deviations ........................................ 2-11 2.3 Impoundment Survey 3 – August 2009 ............................................................... 2-12 2.3.1 Event Summary ....................................................................................... 2-12 2.3.2 Precipitation and Streamflow Conditions ........................................... 2-13 2.3.3 QAPP and Field Sampling Plan Deviations ........................................ 2-15 2.4 Impoundment Survey 4 – September 2009 ......................................................... 2-17 2.4.1 Event Summary ....................................................................................... 2-17 2.4.2 Precipitation and Streamflow Conditions ........................................... 2-18 2.4.3 QAPP and Field Sampling Plan Deviations ........................................ 2-20 2.5 Impoundment Survey 5 – October 2009 .............................................................. 2-21 2.5.1 Event Summary ....................................................................................... 2-21 2.5.2 Precipitation and Streamflow Conditions ........................................... 2-21 2.5.3 QAPP and Field Sampling Plan Deviations ........................................ 2-24 2.6 Impoundment Studies Data Summary ................................................................ 2-26 2.6.1 Dissolved Oxygen and Temperature Profiles ..................................... 2-26 2.6.2 Water Quality Sampling Results ........................................................... 2-26 Section 3 Continuous Monitoring 3.1 Dissolved Oxygen and Temperature Water Quality Standards ........................ 3-4 3.2 Summary of Streamflow Conditions ..................................................................... 3-4 3.3 QA/QC Procedures .................................................................................................. 3-6 i Document Code Table of Contents Upper Merrimack and Pemigewasset River Study Monitoring Report 3.4 Continuous Monitoring Results ............................................................................. 3-7 3.4.1 Impoundments .......................................................................................... 3-7 3.4.2 Downstream of Dams ............................................................................... 3-9 3.4.3 Upstream and Downstream of WWTPs ............................................... 3-10 Section 4 Low Flow and High Flow Water Quality Surveys 4.1 Low Flow Event #1 ................................................................................................... 4-5 4.1.1 Precipitation and Streamflow Conditions ............................................. 4-9 4.1.2 QAPP and Field Sampling Plan Deviations ........................................ 4-14 4.2 Low Flow Event #2 ................................................................................................ 4-18 4.2.1 Precipitation and Streamflow Conditions ........................................... 4-22 4.2.2 QAPP and Field Sampling Plan Deviations ........................................ 4-27 4.3 High Flow Event #1 ............................................................................................... 4-18 4.2.1 Precipitation and Streamflow Conditions ........................................... 4-22 4.2.2 QAPP and Field Sampling Plan Deviations ........................................ 4-27 4.4 Low Flow Data Summary and Observations ..................................................... 4-30 4.4.1 Carbonaceous Biological Oxygen Demand ................................ 4-30 4.4.2 Chlorophyll-a .................................................................................. 4-30 4.4.3 Dissolved Oxygen and Temperature ........................................... 4-31 4.4.4 Nitrogen ........................................................................................... 4-42 4.4.5 Phosphorus ...................................................................................... 4-43 4.4.6 pH ..................................................................................................... 4-46 4.4.7 Bacteria ............................................................................................. 4-46 4.5 High Flow Data Summary and Observations .................................................... 4-30 4.5.1 Carbonaceous Biological Oxygen Demand ................................ 4-30 4.5.2 Chlorophyll-a .................................................................................. 4-30 4.5.3 Dissolved Oxygen and Temperature ........................................... 4-31 4.5.4 Nitrogen ........................................................................................... 4-42 4.5.5 Phosphorus ...................................................................................... 4-43 4.5.6 pH ..................................................................................................... 4-46 4.5.7 Bacteria ............................................................................................. 4-46 Section 5 Sediment Flux Sampling 5.1 Description of Field Activities ................................................................................ 5-3 5.2 Data Summary and Observations .......................................................................... 5-3 5.2.1 Sediment Nutrient Flux ............................................................................ 5-3 5.2.2 Sediment Oxygen Demand ...................................................................... 5-6 5.2.3 Grain Size Distribution ............................................................................. 5-7 Appendices Appendix A: Sampling Station Detail Maps Appendix B: Data Plots Appendix C: Data Tables Appendix D: Data Validation and Usability Reports ii Table of Contents Table of Contents Upper Merrimack and Pemigewasset River Study Monitoring Report Appendix E: Sediment Oxygen Demand Report Appendix F: Sediment Nutrient Flux Report Appendix G: Water Quality Laboratory Reports Appendix H: Streamflow Calculations Appendix I: Field Documentation Appendix J: Other Sampling Data iii Table of Contents List of Tables and Figures Upper Merrimack and Pemigewasset River Study Monitoring Report Tables Table 1-1: Key Tributaries to the Upper Merrimack and Pemigewasset Rivers ........... 1-4 Table 1-2: Status of Program Components ......................................................................... 1-6 Table 1-3: Sampling Constituents and Field Measurements ........................................... 1-8 Table 2-1: Impoundment Survey #1 Samples .................................................................... 2-4 Table 2-2: Precipitation Totals for Impoundment Survey #1 .......................................... 2-5 Table 2-3: Missed Chlorophyll-a Hold Times for Impoundment Survey #1 ................ 2-7 Table 2-4: Impoundment Survey #2 Samples .................................................................... 2-8 Table 2-5: Precipitation Totals for Impoundment Survey #2 .......................................... 2-9 Table 2-6: Missed Chlorophyll-a Hold Times for Impoundment Survey #2 .............. 2-11 Table 2-7: Impoundment Survey #3 Samples .................................................................. 2-12 Table 2-8: Precipitation Totals for Impoundment Survey #3 ........................................ 2-13 Table 2-9: Missed Chlorophyll-a Hold Times for Impoundment Survey #3 .............. 2-16 Table 2-10: Impoundment Survey
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