HomeMy WebLinkAboutSD-23-07 - Supplemental - 0600 Spear Street (55)The Stormwater Section has reviewed the 600 Spear Street Narrative provided by Trudell Consulting
Engineers. We would like to offer the following comments:
1. Sheet C3-03: Pipe from DMH 5 to Gravel Wetland 4 conflicts with solar field fence. Please ensure
clear access to entire length of pipe for future maintenance.
TCE Response: This pipe has been realigned to avoid conflict with the solar field fence.
See updated C3-03 Stormwater Utility Plan in the revised plan set.
City follow-up comment: No updated sheet C3-03 was received. On C2-00, C2-03, C4-02 and
others, the pipe was still shown in conflict.
2. Sheet C8-402:
a. Gravel wetland detail: 6” perforated subdrain is called out as wrapped in fabric. Please
remove fabric detail to minimize clogging.
b. Perforated riser detail: please provide justification for fabric around perforated riser.
TCE Response: Fabric has been removed from both the subdrain and riser details. See
updated Sheet C8-402, attached.
City follow-up comment: The Gravel Wetland – Typical Section detail on C8-402 still has a note
to wrap the 6” underdrain in fabric.
3. EPSC: please consider using the footprints of the gravel wetlands as temporary sediment basins
during construction.
TCE Response: Sheet C5-01 has been updated to include use of the gravel wetland
footprints as temporary sediment basins during construction.
City follow-up comment: The callout provided is very vague. Notes/details should be provided to
make it clear to the contractor that the footprint of the gravel wetland can be used as a
temporary sediment basin during construction and then reconstructed into a gravel wetland
once the contributing drainage area is stabilized. The Vermont Standards and Specifications for
Erosion Prevention & Sediment Control also provide additional details on Temporary Sediment
Basins.