L ONG C REEK W ATERSHED M ANAGEMENT D ISTRICT 2010 – 2011 L ONG C REEK U PDATE January 30, 2012 Presented by Tamara Lee Pinard LCWMD Executive Director CCSWCD Stormwater Program Manager
Agenda 1. Welcome David Russell, Board Vice President 2. Water Quality & Project Overview Tamara Lee Pinard, Executive Director 3. Financial Overview Curtis Bohlen, Treasurer 4. Maine DEP Perspective Don Witherill, Division of Watershed Management 5. Coffee, Social Hour, Meet the Experts
Long Creek Governing Board Dan Bacon, Board President Gerard Jalbert David Russell, Board VP John O’Hara Curtis Bohlen, Treasurer Ed Palmer David Thomes, Secretary Adam Pitcher John Branscom Tom Raymond Brian Goldberg Doug Roncarati Craig Gorris Steve Tibbetts Jim Hughes
Long Creek Technical Advisory Committee Luci Benedict, USM Jeff Dennis, MDEP Fred Dillon, South Portland Zach Henderson, Woodard & Curran Ryan Hodgman, MDOT Tom Raymond, ecomaine Robyn Saunders, GZA Geoenvironmental
Colonel Westbrook Business Park Jetport Sable Oaks Golf Course Maine Mall
Watershed Statistics Total Watershed Acreage = 2240 (3.5 sq miles) Total Impervious Acreage = 739 (33%) Total Miles of Streams ~ 10 miles
What is the big picture problem? Long Creek and its tributaries do not meet state water quality standards
What is the big picture problem?
Urbanization is Hard on Streams • Vegetation along the stream is removed
Urbanization is Hard on Streams • Vegetation along the stream is removed • Impervious surfaces heat and speed water to the stream
Urbanization is Hard on Streams • Vegetation along the stream is removed • Impervious surfaces heat and speed water to the stream • Streams channelize, floodplains fill
Urbanization is Hard on Streams • Vegetation along the stream is removed • Impervious surfaces heat and speed water to the stream • Streams channelize, floodplains fill • Increased pollutant load
Long Creek is Impaired • Stream flow has been altered
Long Creek is Impaired • Stream flow has been altered • Lack of woody debris
Long Creek is Impaired • Stream flow has been altered • Lack of woody debris • Dissolved oxygen is low
Long Creek is Impaired • Stream flow has been altered • Lack of woody debris • Dissolved oxygen is low • High levels of toxic substances
Long Creek is Impaired • Stream flow has been altered • Lack of woody debris • Dissolved oxygen is low • High levels of toxic substances • High levels of chloride
Sondes Monitoring sites permanent & rotating Blanchette Brook Main Stem North Branch South Branch
Consistently does not meet standards Frequently does not meet standards Occasionally does not meet standards Meets standards
Dissolved Oxygen Blanchette Brook North Branch Main Stem South Branch
Dissolved Oxygen: Blanchette Brook
Dissolved Oxygen: Main Stem, Site 5
Dissolved Oxygen: Main Stem, Site 2
Chloride Blanchette Brook North Branch Main Stem South Branch
Chloride during Spring Runoff 2500 700 Groundwater Inflow Spring Melt Late Spring Rain 600 2000 First Flush Specific Conductivity 500 Specific Conductance (us/cm) Chloride Chloride (mg/L) 1500 400 300 1000 End of Storm 230 µg/L 200 500 100 Site 03 (North Branch) 0 0 Spring 2011 03/18/11 04/07/11 04/27/11 05/17/11 06/06/11 06/26/11 07/16/11 08/05/11
Metals Blanchette Brook North Branch Main Stem South Branch
Nutrients Blanchette Brook North Branch Main Stem South Branch
PAHs (Polycyclic Aromatic Hydrocarbons) • Detected two PAH chemicals commonly associated with coal tar sealants
Macroinvertebrates Blanchette Brook North Branch Main Stem South Branch
Monitoring Summary The data collected during 2010 and 2011 suggest the following: – Temperature and dissolved oxygen are major stressors in the upper portion of the watershed. – Chloride is a major stressor in the south and north branches. – Metals and nutrients are stressors throughout the watershed. – Water quantity is a known issue throughout the watershed and is being analyzed further.
Educational Partners • Service learning projects with Unity College (Dr. Lois Ongley). • Street Dust and stream sediment core sampling/evaluation with University of Southern Maine (Dr. Luci Benedict).
What issues are we addressing? • Implement non-structural measures – Chlorides, Metals, Nutrients • Treat 150 impervious acres – Volume of water (stream flow), metals, nutrients, dissolved oxygen, temperature • Implement 10 stream habitat mitigation sites – Dissolved oxygen, temperature, in-stream habitat, fish passage
Goal: Meet Water Quality Standards by 2020 • Implement non-structural measures – Vacuum sweeping, catch basin cleaning – Operation & Maintenance Plans – Targeted education – Land use planning & standards promoting LID • Treat 150 impervious acres – 26.33 acres treated (18%) • Implement 10 stream habitat mitigation sites – 2 completed (20%)
Non-structural - Sweeping
Non-structural – Catch Basin Cleaning
Non-structural – Site/BMP Inspections • 115 site inspections completed • Reports will go out to landowners in February
Non-structural measures – Winter Maintenance • Observe snow storage and revise plans • Potentially group properties into salt usage areas
What Projects Have We Completed? E-24 – Philbrook Avenue E-02 – Maine Mall Road C-11 – Darling Avenue A1-03 – Mall Plaza
Philbrook Avenue Retrofits Impervious Cover Treated: 2.12 acres Project Cost: $435,104
Maine Mall Road Porous Asphalt Impervious Cover Treated: 2.5 acres Project Cost: $368,122
Darling Avenue, South Portland Impervious Cover Treated: 7.21 acres Project Cost: $564,189 Before After After 1” rain
Darling Avenue, South Portland Conveyance Soil Filter Before After
Mall Plaza Phase I Priority Retrofit Impervious Cover Treated: 11 acres Project Cost: $700,818 Under Construction
Completed Soil Media Filter Soil Media Filter - After a 3.75” rainstorm
Mall Plaza Phase II Priority Retrofit Impervious Cover Treated: 3.5 acres Project Cost: $287,617
Blanchette Brook, Westbrook
Blanchette Brook, Westbrook
Blanchette Brook, Westbrook
Blanchette Brook, Westbrook
2012: Thomas Drive, Westbrook $410,000 budget for design & construction Proposed treatment: 15 of 33 acres
2013: Catchment C-08 – North Branch $400K budget for design & construction Proposed treatment: 16 of 30 acres impervious
2014: Catchment E-24 – South Branch $600K budget for design & construction Proposed treatment: 35 of 66 acres impervious
2015: Catchment A1-14 & A1-03 MDOT to complete design & construction Budget: $400K Proposed treatment: 9.4 of 20 impervious acres along Maine Mall Road
2015: Sections 2 & 6 Stream Restoration Budget: $500K Proposed project: • Section 2 - Enhance streamside plantings & explore in-stream restoration • Section 6 - “Chop & drop” trees to create bug and fish habitat
2016: Section 7 Stream Restoration Budget: $500K Proposed project: • Address parking lot discharge & related Mallside eroded bank • Restore floodplain next to retention basin
2017: Section 4 Stream Restoration Budget: $600K Proposed project: Cornerbrook Remove detention basin and restore the floodplain along this stretch stream
2018: Sections 10, 5 & 8 Stream Restoration Budget: $600K Proposed project: Retrofit culvert for fish passage, address eroding stream banks associated with high stream volumes and stormwater outfalls North Branch
2019: Catchment E-34 – South Branch Budget:$600K Proposed treatment: up to 48 acres Proposed project: Retrofit existing dry detention basin in cooperation with redevelopment of TJ Maxx shopping plaza
2020: Section 9 Stream Restoration Clark’s Pond Parkway Budget: $600K Proposed project: Culvert retrofitted to restore fish passage
Landowner Obligations • Pay Assessments on time – Budget for next fiscal year mailed Feb 1 – Next year’s assessments mailed April 1 – Fiscal Year - July 1 – June 30 – Invoicing biannually - January & July • Provide easements for BMPs in Plan
Landowner Obligations – talk to us! Tell us when you have plans to … • Construct new impervious • Redevelop • Sell your property • Resurface pavement • Change contractors for winter maintenance or landscaping
Landowner Obligations • Implement Operation & Maintenance Plans – Maintenance of BMPs (if you installed it, you maintain it) – Winter maintenance – Landscaping – Vacuum sweeping – Catch basin cleaning – Inspection of BMPs
Areas for Exploration – Coal Tar Sealants • Coal tar-based sealcoat produces 30 times more PAH s than no sealcoat. • PAHs may harm fish and, under some conditions, pose a risk of cancer to humans.
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