1. WENDELL PARK STORMWATER IMPROVEMENTS
Spring 2018

2. Project Background
604(b) Water Quality Management Planning Grant Awarded to the Town in to identify potential locations which could be retrofitted with stormwater best management practices (BMPs) that will remediate polluted runoff.
Began with 15 initial sites and narrowed down to 3 for further investigation and preliminary design including Wendell Park, Sumner Street, and Lafayette Street
Further investigation at these sites included a survey to understand the layout of the existing infrastructure as well as test pits to determine groundwater elevations and soil types
Using this information conceptual designs were developed to be used when construction funding could be made available
The Town, in coordination with NepWRA, applied for construction grants to have these designs built and in 2016 an application to construct the design for Wendell Park was approved allowing the Town to move forward with the completion of the design

3. Project Overview – Area Drainage

4. Project Overview - Watershed

5. Project Overview Existing stormwater controls:
21 bypass pipes which channel water directly from the roadway into the stream

6. Project Design
Install precast concrete tree filter boxes and catch basins in each of Wendell Park’s 6 drainage areas (0.20 – 0.30 acres) in order to collect and treat the stormwater runoff 2 1 3 4 5 6

7. Project Design – Tree Filter Boxes
Tree Filter Box located at Lincoln Street and Brook Road in Milton installed in 2009 along with 5 other boxes in the vicinity of Kelly Field

8. Project Design – Tree Filter Boxes

9. Project Scope
Expected to begin this spring and be completed by the end of May
Install 6 Tree Filter Boxes & 6 Catch Basins
All new structures will be connected to existing bypass pipes
The installation of these structures is expected to reduce pollution into the brook by the following amount:
Total Suspended Solids (TSS) by 2600lbs per year
Phosphates (TP) by 8.4lbs per year
Nitrates (TN) by 21.4lbs per year
Fecal Coliform (FC) by 258 billion colonies per year
Broken down by structure below:
Roadway shoulders will be built up with loam and seed to help establish the gutter and direct water into new structures
Dead vegetation and debris will be removed from the brook to allow for better flow

10. QUESTIONS?