HomeMy WebLinkAbout08/09/2022 - Stormwater Review Letter - - TOWN' OF NORTH ANDOVER
DIVISION OF PUBLIC WORKS
384 OSGOOD STREET
NORTH ANDOVER, M,ASSACHUSETTS 0 1,845-2909
JIM STANFORD
DIRECTOR
Telephone (97e.S' -0950
,,lohn.]. Borges PE 68'5
Pax (978) 688-9573
Director of err
August 9, 2022
Ms. Jean Enright
Planning Director
Town of North, Andover,
120 Main Street
North Andover, M,A 01845
RE: RCG J Wiley, LLC — 93 Elm Street/1 Elm Court
Special Permit - Site Plan Application
Dear Jean,
As requested, the engineering department has reviewed the proposed site plan application
including, the plan set: "Site Plan Set for 93 Elm Street and 1 Elm Court, prepared by Civil Deslign
Group, LLC dated May 27, 20122)), for the proposed site and drainage improvements located at 93
E,lm Street and 1 Elm Court.
We offer the following comments, on the proposed site plan application:
1. The drainage pipe after the first bend behind the 1 Elm Court homes is identified as "l 5
feet of pipe to bend sloped at, 0.015 ft/ft It appears the length of this pipe is closer to 45
feet. This label shall be corrected and inverts updated if necessary.
2. The Applicant shall confirm the existing DMH that the new 18" HDPE is tying into is,
sufficient in size to allow the connection of an additional 18" diameter pipe.
3. The Applicant shall work with the DPW to confirm the extent of existing drain pipe that
needs to be replaced within Water Street. If additional lengths need, to be replaced this
work will need to be completed before any of the sump pumps can be tied in and activated.
4. Per the Unilock permeable paver detail, the minimum subbase material shall be a 6-inch
layer of permeable stone base AS,TM No. 57 above a 16-inc,h, minimum layer of permeable
open graded crushed/angular stone AS No. 2. The proposed perm eabile paver detail
shall be revised to reflect the minimum subbase layer thicknesses per the manufacturer.
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08/09/22
5. The Applicant shall confirm during construction that the sidewalk along both Water Street
and Elm Street are constructed to meet ADA requirements as necessary including the
driveway aprons.
6. The Applicant shall submit a long-term operation and maintenance plan that includes all
manufacturer required maintenance activities for the permeable pavers including but not
limited to the following:
A. Paver cleaning; Clean Permeable Concrete Pavers as needed to remove
staining, dirt, debris, etc.
1. Clean per manufacturers recommendations.
B. Maintenance: Permeable Joint Aggregate Material.
1. Annually inspect Permeable Joint Aggregate material for areas clogged
with debris.
Z. Vacuum or sweep as necessary to restore surface infiltration.
3. Remove debris by vacuuming or sweeping Permeable Joint Aggregate
a. Replenish removed Permeable Joint Aggregate material with clean
aggregate material flush to paver lip.
b. Sweep excess material from paver surface
The Long-Term O&M Plan shall also include at a minimum an annual inspection of the
proposed drainage system and cleanouts on-site and if necessary perform the immediate
repairs/maintenance identified during the annual inspection.
7. Per the Massachusetts Stormwater Handbook, signs indicating porous pavement/pavers
shall be installed and the use of sand during winter months shall not be allowed along with
minimizing the use of salt. Signs shall be installed as part of the construction and this
maintenance information shall be included in the long-term O&M Plan along with any
additional maintenance items identified in the Massachusetts Stormwater Handbook.
8. Any work within the Town Right of Way including sidewalk work shall require a Street
Opening Permit from the DPW prior to the start of any work.
If you have any questions please do not hesitate to call.
Sincerely,
John J. Borgesi, P.E.
Assistant DPW Director/Town Engineer
Cc file
TOWN OF NORTH ANDOVER
DIVISION OF PUBLIC WORKS
384 OSOOOD STREET NORTH ANDOVER., MASSACHUSETTS 01.845-2909