RESPONSE Town of Plymouth Great Herring Pond Stormwater
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RESPONSE Town of Plymouth Great Herring Pond Stormwater Improvements Eagle Hill Drive – Priority Sites 1&2 Coastal Pollution Remediation Grant Program RFR ENV 17 CZM 04 June 2016 Prepared for Executive Office of Energy & Environmental Affairs Office of Coastal Zone Management Prepared by Town of Plymouth Department of Marine & Environmental Affairs Coastal Pollution Remediation Program June 2016 ENV 17 CZM 04 Town of Plymouth Great Herring Pond Stormwater Improvements Eagle Hill Drive – Priority Sites 1&2 Coastal Pollution Remediation Grant Program RFR ENV 17 CZM 04 TABLE OF CONTENTS Applicant Information Project Summary 1) The Problem 2) Project Goals 3) Project Approach 4) Operation and Maintenance Commitment 5) Benefits 6) Local Commitment 7) Project Budget 8) Disclosure 9) Supporting Materials/Attachments Attachment 1 Statement from Town Manager, Authorized Signatory Attachment 2 Letters of Support o Herring Ponds Watershed Association o Local Conservation Commission o Massachusetts Bays Program Attachment 3 Water Quality Data o Great Herring Pond Stormwater Monitoring Project Results, February 2016 o Town of Plymouth Pond and Lake Atlas, Final Report, June 2015 Attachment 4 Maps o Map 1, Locus Map & Receiving Waters o Map 2, Project Site Map, Current Conditions o Map 3, Project Site Map, Potential BMP Solutions Attachment 5 Educational Materials o HPWA Run, Herring Run Superhero Story o HPWA Spring 2016 Newsletter Coastal Pollution Remediation Program June 2016 ENV 17 CZM 04 Town of Plymouth COASTAL POLLUTANT REMEDIATION GRANT PROGRAM FY 2017 Request for Responses: ENV 17 CZM 04 Name of Applicant: Town of Plymouth Contact Information Name: Kim Tower Department: Department of Marine & Environmental Affairs Phone: (508) 747-1620 x198 Fax: (508) 830-4081 Email: [email protected] Address: 11 Lincoln Street, Plymouth MA 02360 Project Title: Great Herring Pond Stormwater Improvements Eagle Hill Drive – Priority Sites 1 & 2 Amount Requested: $59,910 Match Amount (at least 25% of TOTAL project cost): $18,080 Total Project Cost: $77,990 Project Summary (briefly describe the proposed project in one or two short paragraphs): The objective of this project is to assess stormwater retrofit options and design the selected suite of best management practices (BMPs) to treat and infiltrate stormwater to the maximum extent. A stormwater water quality assessment was completed in 2015 which indicated the two sites on Eagle Hill Drive as having the greatest impact on water quality. Currently, untreated stormwater discharges to Great Herring Pond via two outfalls on Eagle Hill Drive. Suspended sediment, nutrients, pathogens, hydrocarbons, and other contaminants associated with the runoff negatively impact water quality in the Pond and, as a result, the active herring run between the Pond and the Cape Cod Canal. Great Herring Pond water quality data was assessed in 2014 by the School of Marine Science and Technology and was found impaired when compared to MassDEP and regional standards. The surface water quality impairment is due to limited clarity, high nutrient levels and low dissolved oxygen. This project seeks to improve water quality in Great Herring Pond to protect the viability of the active herring run as well as provide a recreational resource to residents. Coastal Pollution Remediation Program June 2016 ENV 17 CZM 04 Town of Plymouth The Problem The project site (Eagle Hill Drive and Douglas Lane) on Great Herring Pond are located in the South Coastal Watershed with receiving waters of Buzzards Bay in the Buzzards Bay Coastal Watershed (see Attachment 4, Map 1). Great Herring Pond is a 427 acre pond connected to Buzzards Bay via the Cape Cod Canal and the Herring River. Great Herring Pond is spawning habitat for the active Bournedale Herring Run with herring traveling from Cape Cod Canal up Herring Brook to Great Herring Pond to spawn. Herring runs which might have once had hundreds of thousands of returning fish are now reported to have declines of 90% or more of the population. In 2006, the NOAA National Marine Fisheries Service designated both Blueback Herring and Alewives as Species of Concern. Below is a graph from MA Division of Marine Fisheries indicating the decline in herring over the last few decades and slight recovery over the past few years. Updates: 2014 - 278,134 up 10% 2015 - 239,169 down 14% Throughout the past several years there has been an increase in algae blooms and decrease in water clarity in Great Herring Pond and Little Herring Pond. In response to these concerns, the Herring Ponds Watershed Association (HPWA) was established in 2007 as a volunteer neighborhood association focusing on the health of the water and outreach/education. Beginning in 2008 the Town of Plymouth (the Town) began a partnership with the HPWA to assist in water quality sampling, stormwater remediation and outreach efforts. A recent stormwater outfall study completed in 2015 around Great Herring Pond prioritized stormwater sites based on nutrient and suspended solid loads to the pond. As part of this grant application, the Town is focusing on the two outfalls with the highest impacts to the pond, both located on Eagle Hill Drive with stormwater runoff from Eagle Hill Drive and Douglas Lane (see Attachment 4, Map 2). The current stormwater system was installed in 1965 and is comprised of a series of catch basins which transport untreated to two 15” outfalls located directly in Great Herring Pond. The two outfalls are located off of Eagle Hill Drive which is a public road. There are currently town owned stormwater structures off of Douglas Lane which contribute to the outfalls on Eagle Hill Drive. Douglas Lane is currently maintained by the Town and is on the list for public roads acceptance list for Town Meeting. The Town has up-to-date information indicating surface water quality impairment on Great Herring Pond as well as direct stormwater pollution from the outfalls described in this project. The surface water quality impairment is due to limited clarity, high nutrient levels and low dissolved oxygen. In addition, high bacteria levels and total suspended solids have been documented. Below are brief results of these studies; 2015 Stormwater Outfall Assessment in Great Herring Pond, 2014 Plymouth Pond and Lake Atlas Study, 2011-2013 Historical Stormwater Data. Coastal Pollution Remediation Program June 2016 ENV 17 CZM 04 Town of Plymouth 2015 Stormwater Outfall Assessment in Great Herring Pond In the Fall and Winter of 2015, the Town funded an intensive stormwater assessment on six municipal outfalls located around Great Herring Pond. The stormwater assessment was performed by the School of Marine Science and Technology (SMAST) throughout three storm events. Sampling consisted of measuring runoff flow and collected water quality samples throughout the length of the storm. The Technical Memorandum Great Herring Pond Stormwater Monitoring Project Results (see Attachment 3) indicated the two outfalls on the proposed project site at Eagle Hill Drive (R7 and R10) have the greatest pollutant load impact on the pond. The goal of the assessment was to prioritize sites for stormwater remediation efforts to improve water quality in Great Herring Pond. The graphs below are excerpts from the attached Technical Memorandum and demonstrate the impact of total nitrogen, total phosphorus and total suspended solids from each of the six sites during three storm events. Clearly R7 has the largest pollutant load with R10 as the second load. 2014 Plymouth Pond and Lake Atlas Study In 2014 the Town received grant funding from the Massachusetts Environmental Trust to collaborate with SMAST to conduct water sample collection, cover laboratory fees, compile and analyze data with final report on 39 ponds. DMEA staff conducted a press release which brought in over 50 new volunteers for this program. Great Herring Pond was 1 of the 39 ponds sampled in 2014. In addition, the SMAST Watershed Scientist reviewed previous data (2008-2014) collected on this pond to determine whether the pond meets surface water quality standards and regional standards. As indicated in Appendix B25 of the Town of Plymouth Pond and Lake Atlas June 2015 (see Attachment 3) Great Herring Pond is impaired. The impairment is based on consistently limited clarity and high nutrient and chlorophyll concentrations. The dissolved oxygen profiles generally have deep concentrations above the MassDEP regulatory limit, although in some instances in waters deeper than 8m and 9m the concentrations were below the minimum limit. 2011-2013 Historical Stormwater Data In addition to the Stormwater Assessment completed in 2015, stormwater samples were collected at the project site outfalls during 5 separate storm events. Both sites indicate high total phosphorus and total nitrogen levels as well as E-coli levels ranging from 75- 7,400 colonies/100ml. Coastal Pollution Remediation Program June 2016 ENV 17 CZM 04 Town of Plymouth Total Total Total Suspended Nitrogen Phosphorus E-coli Solids Date Location (mg/L) (mg/L) (/100mL) (mg/L) 7/8/2011 R-7 0.302 0.2 75 11/23/2011 R-7 1.492 0.1 375 5/16/2012 R-7 0.862 0.1 >400 11/8/2012 R-10 0.09 0.19 4300 24 11/8/2012 R-7 0.1 0.17 7400 11 11/27/2013 R-7 0.362 0.087 100 18 Project Goals Suspended sediment, nutrients, pathogens, hydrocarbons, and other contaminants associated with the runoff negatively impact water quality in the Pond and, as a result, the active herring run between the Pond and the Cape Cod Canal. This Project seeks to improve water quality in Great Herring Pond in an effort to maintain and improve habitat for the threatened herring run. In order to preserve and protect water quality in this valuable natural resource, pollutant loading entering the pond via stormwater runoff needs to be reduced to the maximum extent practical.