Conservation Commission (linked)

CLA Engineers, Inc.
Civil * Structural ¢ Survey
317 MAIN STREET * NORWICH, CT O6360 e (860) 886-1986 e (860) 886-9165 FAX
Re: Inland Wetland Application #23-09:
295, 313 Willetts Avenue, 16, 18 Boston Post Road
Proposed Woodspring Suites Hotel
1) The phasing and grading plan should include temporary ESC measures for the demolition phase of
the project prior to construction of temporary sediment trap #1 while the buildings and pavement are
being removed.
The Erosion Control plan, sheet 3, and the E & S Narrative on sheet 10 have been revised to
show E & S prior to demolition.
2) Include the recommended timing / season for completion of final grading, topsoil application and
seeding of the stormwater basins in the construction sequence.
Note 20 in the narrative has been added to address this.
3) Include organic matter percent in topsoil specification for basins.
Sheet 9 has been revised to show the percent of organic matter, and that it must be well rotted
compost.
4) Identify on the grading plan how the driveway run-off will reach the rain gardens at Boston Post Road
and Willets Avenue entrances. Are curb-cuts and drainage swales required to convey the run-off?
Sheets 2 and 3 call for no curbing on the west side of the drive and sheet 3 shows the
grading to drain to the rain garden.
5) Include elevations for the stormwater detention galleries on Sheets 4 and 10 and depth above seasonal
water level. ,
The galleries have been changed to 4 rows of 24 inch galleries to provide an absolute minimum
of 2 feet between the bottom of the galleries and the highest point of ground water.
6) Incorporate a planted vegetative buffer between edge of pavement and the downgradient wetland area
and identify limits of mowing on final plans.
Please see sheet 13
Requests from Wade Thomas:
e I shifted the outlet for basin 1 further away from the forebay, see sheet 4.
e The first row of the galleries has been isolated for cleaning, see sheets 4 and 10
artlett, PE, CPSWQ.
LEED Accredited Professional