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CCBWQA Monitoring Report 2018

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CCBWQA Monitoring Report 2018 Cherry Creek Basin Water Quality Monitoring Report Water Year 2018 SUBMITTED TO: PREPARED BY: Cherry Creek Basin Water Quality Authority Clifton Larson Allen LLP Solitude Lake Management 8390 East Crescent Parkway, Suite 300 7000 N Broadway Ste. 108 Greenwood Village, CO 80111-2814 Denver, CO 80221 CCBWQA WY 2018 Annual Report TABLE OF CONTENTS EXECUTIVE SUMMARY .................................................................................................................................................. Executive Summary ..............................................................................................................................................1 Reservior Highlights .............................................................................................................................................1 Watershed Highlights ...........................................................................................................................................6 Pollution Reduction Facility (PRF) Highlights .......................................................................................................9 Groundwater Highlights .......................................................................................................................................9 Water Balance Highlights .................................................................................................................................. 11 Nutrient Balance Highlights .............................................................................................................................. 12 Recommendations and Conclusions ................................................................................................................. 13 Acronyms/Abbreviations .....................................................................................................................................6 1.0 INTRODUCTION ............................................................................................................................... 15 2.0 MONITORING PROGRAM ................................................................................................................. 16 2.1 Sampling Program Objectives ........................................................................................................ 16 2.2 Sampling Program Description....................................................................................................... 17 3.0 WATERSHED MONITORING RESULTS ................................................................................................ 27 3.1 Precipitation ................................................................................................................................... 28 3.2 Stream Flows .................................................................................................................................. 30 3.3 Cherry Creek Water Quality ........................................................................................................... 34 3.4 Cottonwood Creek Water Quality .................................................................................................. 40 3.5 Pollutant Reduction Facilities ......................................................................................................... 42 3.6 Groundwater .................................................................................................................................. 45 4.0 RESERVOIR MONITORING RESULTS .................................................................................................. 53 4.1 USACE Reservoir Flushing Exercise ................................................................................................ 53 4.2 Transparency .................................................................................................................................. 53 4.3 Chlorophyll-α .................................................................................................................................. 57 4.4 Temperature .................................................................................................................................. 59 4.5 Dissolved Oxygen ........................................................................................................................... 62 4.6 pH ................................................................................................................................................... 63 Page | i CCBWQA WY 2018 Annual Report 4.7 Oxidation Reduction POtential ...................................................................................................... 63 4.8 Conductivity ................................................................................................................................... 64 4.9 Total Phosphorus ........................................................................................................................... 65 4.10 Dissolved and Soluble Reactive Phosphorus .................................................................................. 68 4.11 Total Nitrogen ................................................................................................................................ 70 4.12 Total Inorganic Nitrogen (TIN) ....................................................................................................... 72 4.13 Limiting Nutrient ............................................................................................................................ 74 4.14 Trophic State Analysis .................................................................................................................... 75 4.12 Plankton Samples .......................................................................................................................... 76 5.0 WATER BALANCE ............................................................................................................................. 82 6.0 FLOW WEIGHTED NUTRIENT CONCENTRATIONS ............................................................................... 85 7.0 NUTRIENT BALANCE ......................................................................................................................... 88 7.1 Surface Water Loads ...................................................................................................................... 88 7.2 Precipitation Loads ......................................................................................................................... 89 7.3 Alluvial Groundwater Loads ........................................................................................................... 90 8.0 NUTRIENT MASS BALANCES ............................................................................................................. 90 9.0 2018 RECOMMENDATIONS AND CONCLUSIONS ................................................................................ 93 Recommendations and Conclusions ................................................................................................................. 93 References ........................................................................................................................................................ 94 Appendices ........................................................................................................................................................ 97 LIST OF TABLES Table 1. Reservoir Sampling Sites, Parameters, and Frequency ............................................................................ 20 Table 2. Precipitation Site Sampling Parameters ................................................................................................... 20 Table 3. Stream and Groundwater Sampling Sites, Parameters, and Frequency .................................................. 21 Table 4. Analytical Laboratories ............................................................................................................................. 23 Table 5. Total Phosphorus and Total Nitrogen at CC-10 during Base Flow and Storm Events, WY 2018. ............. 38 Table 6. Water Quality in Piney Creek and Cherry Creek, April, June and September WY 2018. ........................... 40 Page | ii CCBWQA WY 2018 Annual Report Table 7. TN and TP at CT-2 During Base Flow and Storm Events, WY 2018. .......................................................... 41 Table 8. Pollutant Reduction Analysis of the Cottonwood PRFs in WY 2018 ......................................................... 43 Table 9. Pollutant Reduction Analysis of the Cottonwood Creek “Perimeter Pond” Wetland PRF in WY 2018. ... 43 Table 10. Pollutant Reduction Analysis of the Peoria St. Wetland PRF in WY 2018. ............................................. 44 Table 11. Pollutant Reduction Analysis of the McMurdo Gulch in WY 2018. ........................................................ 44 Table 12. Impact of Chlorophyll-a Concentrations on Perceived Water Quality ................................................... 59 Table 13. Trophic State Indices for Cherry Creek Reservoir WY 2018. ................................................................... 75 Table 14. Comparison of Cherry Creek Reservoir Monitoring Data to Trophic State Criteria WY 2018. ................ 75 Table 15. Cherry Creek Reservoir WY 2018 Water Balance .................................................................................. 84 Table 16. Flow-Weighted Nutrient Concentrations for Surface
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