Changes Summary and UpdateAs requested in the 1/23/2020 Conservation Commission meeting, and per my 3/6/2020 e-mail, we are providing the following updates regarding the subject project.
The soil tests have been completed, the stormwater basin designs were revised to incorporate underdrain and to avoid existing large trees, and the flood storage compensation area was
reshaped based on updated survey information.
Attached please find the soils report. We are also sending separately a ShareFile link to an updated set of NOI drawings reflecting those changes.
The following table summarizes the changes since the 12/24/2019 NOI submittal:
What Changed
Original NOI Submittal
Updated 3/20/2020
Comments
Soil Test Report for Bioretention Ponds
Not included
Included
Please see attached
I-91 Bioretention Pond Design
No underdrain
Existing trees not mapped.
Underdrain added.
Existing trees surveyed, avoided where possible.
See updated NOI plans
Route 5 Bioretention Pond Design
No underdrain
Underdrain added.
See updated NOI plans
Flood Storage Compensation Area
Designed based on available survey; survey update was in progress.
Design revised based on updated survey.
See updated NOI plans
Landscaping
Minimal landscaping proposed.
Additional landscaping proposed and shown on dedicated landscaping sheet.
See updated NOI plans
Impacts & Mitigation
Original NOI Submittal
Updated 3/20/2020
Comments
Wetlands (BVW) Impact (s.f.)
174 Perm.
8,688 Temp.
174 Perm.
8,688 Temp.
No Change
Wetlands (BVW) Creation (s.f.)
215
215
No Change
BLSF (s.f.)
24,695
33,688
Increased due to base mapping updates
Flood Storage Impact (c.y.)
1,640
1,874
Increased due to base mapping updates
Flood Storage Creation (c.y.)
1,793
1,897
Increased by adding a retaining wall