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Lake Lashaway Management Plan

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Lake Lashaway Management Plan Lake Lashaway Management Plan North Brookfield and East Brookfield, Massachusetts PREPARED FOR Mr. Jake Cabrera, Co-President Lake Lashaway Community Association 63 Shore Road North Brookfield, MA 01535 PREPARED BY ESS Group, Inc. 100 Fifth Avenue, 5th Floor Waltham, Massachusetts 02451 ESS Project No. L198-000 January 29, 2019 www.essgroup.com TABLE OF CONTENTS SECTION PAGE 1.0 INTRODUCTION ..................................................................................................................................... 1 2.0 METHODS AND APPROACH ................................................................................................................ 1 2.1 Review of Existing Information ......................................................................................................... 1 2.2 Aquatic Plant Assessment ................................................................................................................ 1 2.3 Bathymetric Survey .......................................................................................................................... 1 2.4 Fish and Wildlife Assessment ........................................................................................................... 1 2.5 Water Quality Assessment ............................................................................................................... 2 2.5.1 Surface Water ......................................................................................................................... 2 2.5.2 Ground Water Quality Assessment ......................................................................................... 2 2.6 Sediment Assessment ...................................................................................................................... 3 2.7 Hydraulic Budget and Nutrient Modeling .......................................................................................... 3 3.0 RESULTS ................................................................................................................................................ 5 3.1 Review of Existing Information ......................................................................................................... 5 3.2 Aquatic Plant Assessment ................................................................................................................ 6 3.3 Bathymetric Survey .......................................................................................................................... 6 3.4 Fish and Wildlife Assessment ........................................................................................................... 7 3.5 Water Quality Assessment ............................................................................................................... 7 2.5.1 Surface Water ......................................................................................................................... 7 2.5.2 Ground Water Quality Assessment ......................................................................................... 9 3.6 Sediment Assessment .................................................................................................................... 10 3.7 Nutrient Loading Assessment......................................................................................................... 11 4.0 MANAGEMENT FEASIBILITY ASSESSMENT AND RECOMMENDATIONS ..................................... 14 4.2.1 Watershed Level Options ...................................................................................................... 15 4.2.1.1 Agricultural Best Management Practices – Recommended ........................................ 15 4.2.1.2 Bank and Slope Stabilization – Not Recommended ................................................... 15 4.2.1.3 Behavioral Modifications - Recommended .................................................................. 15 4.2.1.4 Detention or Infiltration Basin Use and Maintenance – Recommended – Long Term 16 4.2.1.5 Increased Street Sweeping and Catch Basin Cleaning - Recommended ................... 17 4.2.1.6 Maintenance and Upgrade of On-site Disposal Systems – Not a Priority ................... 17 4.2.1.7 Provision of Sanitary Sewers – Not Recommended ................................................... 18 4.2.1.8 Stormwater or Wastewater Diversion – Not Recommended ....................................... 18 4.2.1.9 Zoning and Land Use Planning – Not Recommended ................................................ 18 4.2.1.10 Treatment of Runoff or Stream Flows – Recommended – Short Term .................... 19 4.2.2 Watershed Level Recommendations ................................................................................ 19 4.3.1 In-lake Level Options ............................................................................................................ 20 4.3.1.1 Aeration and/or Destratification – Not Recommended ................................................ 20 4.3.1.2 Biocidal Chemical Treatment (Herbicides) - Recommended ...................................... 20 4.3.1.3 Bottom Sealing – Not Recommended ......................................................................... 21 4.3.1.4 Dredging – Not Recommended ................................................................................... 22 4.3.1.5 Macrophyte Harvesting – Not Recommended ............................................................ 22 4.3.1.6 Hydroraking and Rotovation - Not Recommended ..................................................... 23 4.3.1.7 Hypolimnetic Withdrawal – Not Recommended .......................................................... 24 4.3.1.8 In-Lake Sediment Nutrient Inactivation – Not Recommended .................................... 24 4.3.1.9 Water Level Control (Drawdown) – Recommended .................................................... 24 4.3.1.10 Biological Controls – Not Recommeded .......................................................................... 25 4.3.2 In-Lake Level Recommendations ......................................................................................... 26 5.0 Available Grants and Funding ........................................................................................................ 26 6.0 REFERENCES ...................................................................................................................................... 28 © 2019 ESS Group, Inc. – This document or any part may not be reproduced or transmitted in any form or by any means, electronic, or mechanical, including photocopying, microfilming, and recording without the express written consent of ESS Group, Inc. All rights reserved. TABLES Table 1 Aquatic Macrophytes Documented on August 6, 2018 Table 2 Wildlife Documented on August 6, 2018 Table 3 Results of Dry Weather Water Quality Sampling Table 4 Water Quality Profiles August 6, 2018 Table 5 Results of Groundwater Sampling, September 20, 2018 Table 6 Results of Sediment Analysis, September 20, 2018 Table 7 Summary of Lake Lashaway Hydrology Table 8 Summary of Lake Lashaway Nutrient Loading Models Table 9 Average Annual Nutrient Load by Land Use within the Lake Lashaway Watershed Table 10 Potential Grant and Funding Opportunities for Management of Water Quality, Vegetation, and Wildlife FIGURES Figure 1 Aquatic Vegetation Cover Figure 2 Aquatic Vegetation Biomass Figure 3 Fanwort Cover Figure 4 Variable-leaf Milfoil Cover Figure 5 Brittle Naiad Cover Figure 6 Bathymetric Map Figure 7 Groundwater Seepage Meter Segment Figure 8 Land Use 1985 Figure 9 Land Use 2005 APPENDICES Appendix A Hydraulic and Nutrient Model Output 3 1.0 INTRODUCTION Lake Lashaway is a 293-acre waterbody located in North Brookfield and East Brookfield, Massachusetts. The warmwater lake is located in the Chicopee Watershed in Worcester County (D FW 2011). The Lake Lashaway Community Association (LLCA) commissioned this report to identify underlying causes of extensive growths of aquatic weeds and algal blooms within the lake. Lake Lashaway has been drawn down annually to help manage weed growth. However, drawdown alone has not been sufficient to prevent the spread of non-native weeds and does not have a significant positive effect on the water quality within the lake. As such, the lake routinely experiences algal blooms Field boat on Lake Lashaway for initial and occasionally is closed due to excessive bacteria at the town water quality and biological surveys on beach. August 6, 2018. 2.0 METHODS AND APPROACH The field studies and data evaluation supporting analysis of Lake Lashaway were conducted from August through October 2018. They included a review of existing information and studies, GIS mapping, field data collection, data analysis, and lake modeling. The methods and approach specific to each task are described in the following sections. 2.1 Review of Existing Information Existing information regarding many physical, chemical, and biological aspects of Lake Lashaway were available prior to the onset of this study. Existing information provided from the LLCA and other available on-line sources was used to help describe past and present recreational use, community use, and ecological conditions. 2.2 Aquatic Plant Assessment On August 6, 2018, ESS scientists conducted aquatic plant mapping to assess the current condition of the pond with respect to water quality, aquatic plant, and algae growth. ESS scientists mapped the locations of all native and non-native aquatic plant species at 53 regularly spaced sampling
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