HomeMy WebLinkAboutRussoCSSReportCLA Engineers, Inc.
Civil • Structural • Survey
317 MAIN STREET • NORWICH, CT 06360 • (860) 886-1966 • (860) 886-9165 FAX
July 27,2017
Liz Burdick
Wetlands Agent/Zoning Enforcement Officer
Town of Montville
310 Norwich-New London Tpk.
Uncasville, CT 06382
RE: DW Holdings
23 Pequot Rd
CLA-5781 Y
Dear Ms. Burdick:
CLA has reviewed the material submitted by the applicant for the referenced
project, including the site plans (Prepared by BSC Group) and the wetland application
permit document (also prepared by BSC Group). CLA notes that the proposed basin is
intended to improve the water quality discharge from the site to Oxoboxo Brook. CLA
visited the site on July 25, 2017. CLA has the following comments regarding this
application.
1. The 100 Year Flood Plain shown on the plan does not match the attached FEMA
mapping. The applicant has indicated that the property is in a Flood Hazard Area,
but doesn't it on the plan.
2. The applicant should provide a post-construction operation and management plan
for the storm water basin.
3. No existing soils data for the basin bottom have been provided. This may be
problematic due to the developed state of the site. The applicant should provide a
soil specification for a two foot thickness of appropriate fill in the area proposed
for infiltration.
4. A benchmark tied into NAVD 88 must be shown on the plan.
5. Have the proposed holding tanks been investigated for buoyancy? The 7 foot
depth of the tanks puts them well below the underdrainge.
6. The two properties should be combined.
7. Will there be times for reverse flow into the proposed underdrain system?
8. The slope of the infiltration basin requires a guiderailing along the right-of-way
line.
Based on our review, CLA feels that the application is lacking sufficient detail with
regard to E&S and Storm water treatment.
Please call me with any questions
Very truly yours,
Robert C. Russo, CSS
~-(cf2Y-~-
ThJ~as L. Cummings, P.E.
MAP SCALE 1" =500'
50
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500
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1000
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I METER
~[ PANEL0353G ]
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FLOOD INSURANCE RATE MAP
NEW LONDON COUNTY,
CONNECTICUT
ALL JURISDICTIONS
PANEL 353 OF 554
(SEE MAP INDEX FOR FIRM PANEL LAYOUT)
NUIofBER ~~
090099 Cl353 G
Notice to User: The Map Number shown belcm
should be used when placing map orders; ,the
Community Humber shown above should be
used on insurance applications tor the subject,
community.
MAP NUMBER
09011C0353G
EFFECTIVE DATE
JULY 18, 2011
I
This is an official copy of a FXJrtion of the above referenced flood map. It
was extracted using F-MIT On-Une. This map does not reflect changes
or amendments 'Nhich may have been made subsequent to the date on the
.n' k Ititle block. For the latest product information about National Flood Insurance riC e Program nood maps check the FEMA Flood Map Store at www.msc.fema.gov