HomeMy WebLinkAboutSP-20-020 - Supplemental - 0064 Aiken Street (89)The Stormwater Section has reviewed the “South Village Communities, LLC Lots 4A &4B” plans prepared by Civil Engineering Associates, Inc., dated 3/16/2020. We would like to offer the
following comments:
This project is located in the Bartlett Brook watershed. This watershed is listed as stormwater impaired by the State of Vermont Department of Environmental Conservation (DEC).
As the project proposes to create more than one-half acre of impervious surface, the project is subject to the requirements of section 12.03 of the LDRs.
According to the 2017 VSMM, grass channels are not identified as an acceptable practice for meeting WQTS. Are the treatment ponds fully constructed at this time? Are they constructed
to the 2017 standards? The applicant is requested to provide further clarification regarding the previously permitted treatment practices. Is the grass channel installed? Please provide
an updated Hydrology Plan.
It is requested that the applicant include a condition requiring the regular maintenance of all stormwater treatment and conveyance infrastructure.
The applicant is asked to provide clarification on the elevation of the Recreation Path at the location of the discharge pipe for CB#1 (invert 362.2’). Will the path be impacted by the
discharge of the pipe? Based on limited contour information and elevations given on C2.0, it appears that it will flood the path.
The cover letter references a proposed soccer field. Is this area being constructed within this phase of work? If so, please ask the applicant to include more details regarding the field
location, parking and stormwater related impacts.
On the EPSC Plan, the Stabilized Construction Entrance appears to be at the side of the property for trucks entering the site, not leaving. Additionally, the note reads that the contractor
can install a stabilized construction entrance “or sweep Aiken Street daily”. It is requested that the applicant correct these notes in the ESPC Plan C3.0 to require a Stabilized Construction
Entrance at any point that construction vehicles will be leaving the site.
The applicant is requested to include a note regarding the erosion matting that includes “only woven and interlinked products are approved for use in temporary RECP applications.” As
per Vermont DEC regulations.
The applicant is requested to provide further detail regarding the outlet of any possible parking garage drainage/ sumps and roof drainage.
Has the applicant completed a downstream analysis for the 25-year storm event in accordance with §12.03.E(3) of the City’s Land Development Regulations? Please provide details with the
application.
There is a note on the EPSC Notes and Details that requires: Limit the amount of disturbed earth to two acres or less at any one time. But on the EPSC Plan C3.0 Note 4 reads: Maximum
Allowable Concurrent Earth Disturbance Area- 5.0 Acres. Please clarify.