HomeMy WebLinkAboutSS Comments #1 9-8-2025From:Stacy Radford
To:Stacy Radford
Subject:FW: 25 IWC 22 - 69 Fitch Hill Road
Date:Wednesday, September 10, 2025 8:25:44 AM
From: David McKay <dmckay@boundariesllc.net>
Sent: Monday, September 8, 2025 7:10 PM
To: Stacy Radford <sradford@montville-ct.org>
Cc: John Faulise <jfaulise@boundariesllc.net>
Subject: RE: 25 IWC 22 - 69 Fitch Hill Road
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Good afternoon Stacy,
I looked through the revised documents and have a couple of comments/questions regarding thestormwater basins.
1. Using the provided as-built contours I estimated the storage volumes of the stormwater
basins. Stormwater Basin 2 (eastern basin) appears to meet or exceed the originally proposed
storage volume but I couldn’t reproduce the results for the volume of Stormwater Basin 1
from the PDF given the scale of the drawing. Could an analysis of the storage volume of the
as-built stormwater basins be provided to ensure that the design runoff storage volume has
been maintained?
2. The approved modified layout of Stormwater Basin 2 incorporated a sediment forebay on the
southeastern end to capture runoff from the paved laydown area that was added to the site
plan. This sediment forebay should still be constructed if the paved laydown area was built
per the plan. Additionally there is a riprap area shown on the southeastern end of Stormwater
Basin 2 inletting runoff into the basin without first entering a sediment forebay. During
comment response for the original site plan it was stated that all runoff from the entrance
driveway would be directed to the forebay. This end of the basin should be reconfigured to
allow for a sediment forebay to pre-treat the runoff from the entrance driveway and the paved
laydown area.
The field modifications increased the disturbance within the upland review area by approximately3,600 square feet for Stormwater Basin 1 and 970 square feet for Stormwater Basin 2 based on theas-built survey of the stormwater basins. Given the highly disturbed nature of the site prior to thestart of construction I agree with Bob Russo’s letter that the increased disturbance area likely won’tsignificantly impact the wetland system. My recollection is that the area in question was mostlydebris piles and scrub brush, so as long as the erosion and sedimentation controls have beenmaintained at the limits of disturbance I think that once dense vegetation has been established itshould be an improvement over what was there before the project. If mature wooded area was cleared for the modified stormwater basins it might be worth having Ianinvestigate the current field conditions immediately surrounding the stormwater basins. Please let me know if you would like this drafted into a more formal letter.
Thank you!Dave
David C. McKay, P.E.
Boundaries L.L.C.
179 Pachaug River Drive
P.O. Box 184
Griswold, CT 06351
Phone: 860-376-2006
Fax: 860-376-5899
Cell: 860-841-1059