HomeMy WebLinkAbout08/12/2022 - Response to Stormwater Review Letter - - IVIL E S I GN RO UP LLC 21 High Street,Suite 8207
45
) North Andover,MA 01845
7945400
ENGINEERING. LAND USE. PLANNING. PERMITTING. Tel 978. .
www.cdgengineeringng.com
August 12, 2022
via email
Ms. Jean Enright
Planning Director
Town of North Andover
120 Main Street
North Andover, MA 01845
Re: RCG J Wiley, LLC
93 Elm Street & 1 Elm Court
North Andover, MA 01845
Response to Comments
Dear Ms. Enright:
On behalf of the applicant, RCG, LLC, Civil Design Group, LLC (CDG) is in receipt of the peer review
letter issued by the Town Engineer dated 08/09/2022. In coordination with the development team,
CDG's responses are provided in bold below the original comments and supporting plans and
documentation are enclosed herein:
1. The drainage pipe after the first bend behind the 1 Elm Court homes is identified as "15
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.
CDG Response: The pipe length text has been revised to reflect a 45 lineal foot. The
inverts and slope were correct.
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.
CDG Response: Acknowledged: Based on the 90 degree entry angle as
compared to the existing pipe penetrations, it appears that the manhole can
accommodate the proposed connection. However, the contractor shall expose
the manhole and verify that it's in good condition and of sufficient size at
time of construction.
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.
CDG Response: Acknowledged. The Applicant shall coordinate with DPW's office
prior to construction to discuss the same.
Lise s:dbdVi§iais i iii i ii i s�bi 4� i::t fli iiJi(Ji III d
IVIL E S I GN RO UP LLC 21 High Street,Suite 8207
45
) North Andover,MA 01845
7945400
ENGINEERING. LAND USE. PLANNING. PERMITTING. Tel 978. .
www.cdgengineeringng.com
4. Per the Unilock permeable paver detail, the minimum subbase material shall be a 6-
inch layer of permeable stone base ASTM No. 57 above a 16-inch minimum layer of
permeable open graded crushed/angular stone ASTM No. 2. The proposed permeable
paver detail shall be revised to reflect the minimum subbase layer thicknesses per the
manufacturer.
CDG Response: The permeable paver detail has been revised accordingly.
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.
CDG Response: Acknowledged.
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:
• Paver cleaning: Clean Permeable Concrete Pavers as needed to
remove staining, dirt, debris, etc.
• Clean per manufacturers recommendations.
• Maintenance: Permeable Joint Aggregate Material.
• Annually inspect Permeable Joint Aggregate material for areas
clogged with debris.
2. 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.
CDG Response: An Operation and Maintenance Plan has been prepared and
includes the requested items above.
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.
iii miii(Jeii 4 iii di�11( d Lise st dbdVi§iais i iii i ii i° bi 4� i Yl t 'Ji III d
IVIL E S I GN RO UP LLC 21 High Street,Suite 8207
45
) North Andover,MA 01845
7945400
ENGINEERING. LAND USE. PLANNING. PERMITTING. Tel 978. .
www.cdgengineeringng.com
CDG Response: Signs have been added to plan set and same has been added to the
Operation and Maintenance Plan.
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.
CDG Response: Acknowledged.
We trust the responses provided above and the enclosed plans sufficiently address the comments issued
by the Town Engineer. Please feel free to contact our office if you have any questions or require further
clarification.
Sincerely,
CIVIL DESIGN GROUP, LLC
Philip R. Henry, P.E.
Principal
cc. Mr.David Steinbergh,RCG
Mr.Brian Vaughan,Esq.
Enclosures
Lise st dbdVi§iais i iii i ii i° bi 4� i 1 l t fli iiJi(Ji III d