Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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LAKE POCOTOPAUGLAKE AND WATERSHEDRESTORATION EVALUATIONPrepared for:Town of East Hampton20 East High StreetEast Hampton, ConnecticutPrepared by:ENSR International2 Technology Park DriveWestford, Massachusetts 01886
TABLE OF CONTENTSLAYPERSON’S SYNOPSIS .......................................................................................................... i1.0 EXECUTIVE SUMMARY ........................................................................................................12.0 INTRODUCTION ....................................................................................................................33.0 BACKGROUND INFORMATION ............................................................................................53.1 Previous Studies and Major Event Chronology..................................................................53.2 Watershed Features.........................................................................................................113.3 Lake Features ..................................................................................................................154.0 METHODS AND APPROACH ..............................................................................................174.1 Quality Control and Quality Assurance ............................................................................174.2 Hydrology .........................................................................................................................194.3 Water Quality....................................................................................................................204.4 Nutrient Loading ...............................................................................................................254.5 Biological Characterization...............................................................................................255.0 HYDROLOGIC INPUTS.......................................................................................................275.1 Precipitation......................................................................................................................275.2 Groundwater.....................................................................................................................275.3 Surface Water ..................................................................................................................276.0 WATER QUALITY................................................................................................................296.1 In-Lake Water Quality.......................................................................................................296.2 Tributary and Storm Drain Water Quality .........................................................................396.3 In-Lake Biology.................................................................................................................496.3.1 Phytoplankton ............................................................................................................496.3.2 Chlorophyll a..............................................................................................................646.3.3 Zooplankton ...............................................................................................................657.0 RELATIONSHIPS AND TRENDS........................................................................................707.1 Precipitation......................................................................................................................707.2 Secchi Disk Transparency, Total Phosphorus and Chlorophyll a ....................................708.0 PHOSPHORUS LOADING ..................................................................................................838.1 Loading Sources ..............................................................................................................838.4 Tributary and Storm Drain Loading ..................................................................................858.5 Loading Summary ............................................................................................................879.0 DIAGNOSTIC SUMMARY ...................................................................................................8910.0 MANAGEMENT NEEDS AND OBJECTIVES ..................................................................9211.0 POTENTIAL MANAGEMENT OPTIONS ...........................................................................9311.1 Reducing Non-Algal Turbidity.........................................................................................9311.2 Reducing Total Phosphorus and Sediment Loading from the Watershed .....................9411.2.1 Source Controls ........................................................................................................9411.2.2 Transport Mitigation .................................................................................................97
Page 4 and 5: 11.3 Prevent algal blooms from occu
Page 6 and 7: LAYPERSON’S SYNOPSISLake Pocotopa
Page 8 and 9: The stocking of walleye in Lake Poc
Page 10 and 11: Lake Pocotopaug Restoration Evaluat
Page 12 and 13: Period Covered 1988• Pollution fr
Page 14 and 15: Recommendations included• Algacid
Page 16 and 17: Major EventDecember 1999 - Fish kil
Page 18 and 19: Table 5. Land Use from the CT DEP G
Page 22 and 23: Figure 4. Lake Pocotopaug Bathymetr
Page 24 and 25: Table 6. QA/QC on Water Quality Dat
Page 26 and 27: Soils - USDA at MAGIC UCONN Geograp
Page 28 and 29: Table 8. Water Quality Variables Me
Page 32 and 33: Phytoplankton samples were collecte
Page 34 and 35: where many measurements would have
Page 36 and 37: Figure 7. 2001 Temperature and Diss
Page 38 and 39: Table 10 continued. 2001 Lake Pocot
Page 40 and 41: phytoplankton biomass (Wetzel 1983)
Page 42 and 43: Figure 9. Annual June, July and Aug
Page 44 and 45: elow 7:1 occurred on September 22,
Page 46 and 47: Table 12. 2001 Dry and Wet Weather
Page 48 and 49: Table 12 continued. 2001 Dry and We
Page 50 and 51: Table 12 continued. 2001 Dry and We
Page 52 and 53:
Table 12 continued. 2001 Dry and We
Page 54 and 55:
Table 12 continued. 2001 Dry and We
Page 56 and 57:
were identified to genus and enumer
Page 58 and 59:
Table 13 continued. 2001 Phytoplank
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Figure 10. 2001 Phytoplankton Bioma
Page 70 and 71:
The late summer bloom of blue-green
Page 72 and 73:
Table 15. 2001 Zooplankton DensityZ
Page 74 and 75:
Table 16. 2001 Zooplankton BiomassZ
Page 76 and 77:
7.0 RELATIONSHIPS AND TRENDS7.1 Pre
Page 78 and 79:
Figure 13. 1991-2001 Surface Water
Page 80 and 81:
Figure 15. 2001 Surface and Mid-dep
Page 82 and 83:
Figure 16. 1991-2001 Chlorophyll a
Page 84 and 85:
Figure 18. 2001 Chlorophyll a vs. S
Page 86 and 87:
Figure 20. 1991-2001 July and Augus
Page 88 and 89:
Table 17. Empirical Model Calculati
Page 90 and 91:
Table 18. Total Phosphorus Loading
Page 92 and 93:
Table 19. Wet Weather Loading Summa
Page 94 and 95:
With the best possible treatment of
Page 96 and 97:
water quality should focus on input
Page 98 and 99:
10.0 MANAGEMENT NEEDS AND OBJECTIVE
Page 100 and 101:
11.2 Reducing Total Phosphorus and
Page 102 and 103:
undeveloped forest land, an opportu
Page 104 and 105:
Figure 22. Buffer Strips for Pollut
Page 106 and 107:
Figure 23. Catch Basin with Sump an
Page 108 and 109:
early spring to capture what appear
Page 110 and 111:
Figure 26. Infiltration Systems.Lak
Page 112 and 113:
Figure 27. Constructed Treatment We
Page 114 and 115:
Chemical TreatmentIn-stream chemica
Page 116 and 117:
TABLE 21. MANAGEMENT OPTIONS FOR CO
Page 118 and 119:
TABLE 21 continued. MANAGEMENT OPTI
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
12.0 ADDITIONAL DATA NEEDSManagemen
Page 132 and 133:
13.0 RECOMMENDED MANAGEMENT PROGRAM
Page 134 and 135:
this point, but as a rough guide, a
Page 136 and 137:
14.0 REFERENCESAd Hoc Lake Advisory
Page 138 and 139:
Scheuler T.R., P.A. Kumble, & M.A.
Page 140 and 141:
Appendix B:Supplemental Tables and
Page 142:
Appendix D:Educational MaterialsLak
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