HomeMy WebLinkAbout2019-09-17 Stormwater Peer Review 9/17/2019 Town of North Andover Mail-505 Sutton Street(Multi-Family)-Peer Review Responses
......_..__ r
Nogk AND,OVER
MassachusOs ' Monica Gregoire<mgregoire@northandoverma.gov>
505 Sutton Street (Multi-Family) -Peer Review Responses
Janet Bernardo <jbernardo@horsleywitten.com> Mon, Sep 16,2019 at 9:37 AM
To: Monica Gregoire <mgregoire@northandoverma.gov>
Cc: Peter Ellison <pellison@theengineeringcorp.com>, Jean Enright<jenright@northandoverma.gov>, Amy Maxner
<amaxner@northandoverma.gov>,John Borges! <jborgesl@northandoverma.gov>, Renee Bourdeau
<rbourdeau@horsleywitten.com>
Good morning Monica,
The Applicant's response was acceptable.We have no further comments.
[Quoted text hidden)
https:flmall.google.camlmal€ful0?i k=daddl 872e7&view=pt&search=all&permmsgid=msg-f%3A1644839394G10780929&simpl=msg-f%3A16448393946... Ill
Horsley Witten Group
Sustainable Environmental Solutions
- 1
284 Washlnpton Street•Suite 801 Boston,ILIA 02108
857-263-8193•homleywillen com a
July 1, 2019
I'
Ms. Monica Gregoire, Staff Planner
Planning Department
Town of North Andover
120 Main Street
North Andover, Massachusetts 01845
Ref: Stormwater Peer Review
505 Sutton Street
Town of North Andover
Dear Ms. Gregoire and Board Members:
The Horsley Witten Group, Inc. (HW) is pleased to provide the North Andover Planning Board
with this letter report summarizing our initial review of the Drainage Report and Permitting Plans
for the proposed Multifamily Development at 505 Sutton Street, North Andover, MA (Applicant).
The plans were prepared for the Sutton Street Redevelopment, LLC (Applicant) by The Morin-
Cameron Group, Inc. HW understands that the Applicant is proposing to construct three
multifamily residential buildings, surface and underground parking, landscaping improvements,
a stormwater management system and new utility infrastructure. The project proposes to
redevelop a 5.10-acre lot that currently contains an existing commercial building with associated
parking, drainage, and utility infrastructure. The south and eastern portions of the site are
currently undeveloped. There are no wetlands on-site, however at the south side of the site
there is a buffer zone that is associated with an isolated wetland that is located off-site.
The following documents and plans were received by HW:
• Special Permit Cover Letter, prepared by Sutton Street Redevelopment, LLC, dated May 30,
2019;
• Memorandum in Support of Special Permit Applications, dated May 30, 2019;
• Common Driveway Special Permit Application;
• Planning Board Application for Special Permit;
• Drainage Report (222 pages)for the Multifamily Site Development located at 505 Sutton
Street, prepared by The Morin-Cameron Group, Inc., dated May 16, 2019, which includes:
o Drainage report narrative which includes an executive summary, existing site
description, proposed site description, stormwater management(existing watershed
characteristics, proposed watershed characteristics, hydrologic analysis &
stormwater management standards) and conclusion;
o Figures which include an ortho map, USGS locus map, SCS soil map, FEMA flood
map, pre-development watershed plan and post-development watershed plan;
o Stormwater Management Report Checklist;
HorsleyWitten.com ()HorsleyWMenGroup Horsley Witten Croup, Inc.
I
Town of North Andover
July 1, 2019
Page 2of5
o Existing conditions HydroCAD model results for the 1" and the 2-,10-, 25-and 100-
year storms;
o Proposed conditions HydroCAD model results for the 1" and the 2-,10-,25- and 100-
year storms;
o Supplemental Stormwater Management Calculations
o Construction Phase Best Management Practices
o Long Term Best Management Practices O&M Plan
o Test Boring Logs
o Illicit Discharge Compliance Statement
o TSS Removal Calculations
• Multifamily Site Development Plans, 505 Sutton Street, North Andover, Massachusetts,
prepared by The Morin-Cameron Group, Inc., dated May 16, 2019, which include:
o Cover Sheet C.1
o Existing Conditions Plan C.2
o Site Preparation and Erosion Control Plan C.3
o Site Layout Plan C.4
o Grading & Drainage Plan C.5
o Utility Plan C.6
o Soil Test Pit Logs Plan C.7
o Construction Details 1 C.8
o Construction Details 11 CA
a Construction Details III C.10
o Construction Details IV CA I
o Construction Details V C.12
o Construction Details VI C.13
o Planting Plan L1.1
o Site Lighting Plan L1.2
o Exterior Elevations Building 1 P.14— P.15
o Exterior Elevations Building 2 P.25— P.26
o Exterior Elevations Building 3 P.35— P.36
Stormwater Management Design Deer Review
HW offers the following overall comments concerning the stormwater management design as
per the Massachusetts Stormwater Handbook (MSH) dated February 2008, the North Andover
Stormwater Management and Erosion Control Regulations (Stormwater Regulations) adopted
February 5, 2011, and the North Andover Stormwater Management and Erosion Control Bylaw
(Bylaw).
The comments below correlate with the MSH standards and where the more stringent Town
requirements are applicable additional comments are noted. More than 50% of the proposed
development can be considered redevelopment. The area that is currently pervious must be
treated as new development.
HAProjects120t3118065 N Andover On-Cai11IF065EI 505 Sutton S1ree€1ReportA190701_tst Peer Revivw 5115 Sutton Street.doex
i
i
Town of North Andover
July 1, 2019
Page 3 of 5
i
I
1. Standard 9 states that no new stormwater conveyances (e.g. outfalls) may discharge
untreated stormwater directly to or cause erosion in wetlands or waters of the
Commonwealth.
a. The Applicant has analyzed the existing and proposed stormwater discharge rates
from the project site at the property boundaries. At the south property boundary, the
development discharges stormwater overland towards an isolated vegetated
wetland. The flow is not significant towards this resource area and erosion is not
anticipated.
b. The Applicant will also be discharging a majority of the proposed flow towards the
municipal drainage system in Sutton Street. To verify that the outlet of the municipal
system will not cause erosion in waters of the Commonwealth HW recommends that
the Applicant provide a narrative describing where the municipal system currently
outlets and document that no erosion is currently occurring.
2. Standard 2 requires that stormwater management systems shall be designed so that post-
development peak discharge rates do not exceed pre-development peak discharge rates.
a. The Applicant has provided clear documentation to illustrate that the post-
development peak discharge rates do not exceed pre-development rates. However,
the bottom of the stone for each subsurface system listed on Sheet C.12 does not all
correlate with the bottom of the stone elevations provided in the HydroCAD modeling
calculations. HW recommends that the Applicant revisit the plan and calculations for
Infiltration Systems #2, #3, and#4, as well as Detention System #1.
b. For clarity HW recommends that the Applicant list the Retain-It chamber size on
Sheet C.12 for each of the individual systems and verify that the correlating details
are provided on Sheet C.13.
c. The Applicant has conducted soil evaluations within each of the subsurface systems
and has provided the soil logs on Sheet G7. HW requests that the surface elevations
of the test pits within the infiltration systems be added to the test logs.When
responding to comment 2.a. above HW recommends that the Applicant verify that it
Is providing adequate separation to groundwater from the bottom of the stone,
specifically for Infiltration Systems#3 and #4.
d. The Applicant has regraded the entire site including along the western, southern, and
eastern property boundaries. Under existing conditions, the stormwater flows within
the site boundaries towards#19 Surry Drive (west boundary) and #946 Osgood
Street(east boundary). Under proposed conditions the site sheet flows towards
additional abutting properties, including #25, 435, #43, #51, and 459 Surrey Drive.
HW recommends that the Applicant clarify whether the abutting property owners will
receive more stormwater under proposed conditions than they do under existing
conditions.
3. Standard 3 requires that the annual recharge from post-development shall approximate
annual recharge from pre-development conditions.
a. In Appendix D of the Drainage Report, the Applicant has provided calculations to
demonstrate that the infiltration systems are sized to capture and recharge the
groundwater recharge volume for HSG C generated from the new impervious area.
I1:\Projecls120t3118065 h'AndoverOwCaIR19005i1 505 Sutton S1rwt Rvpnr1s\1 907O1_Ist Pcer Review SUS Sutton Strca.ducx
Town of North Andover
July 1, 2019
Page 4 of 5
HW recommends that the Applicant revise the calculations for the provided recharge
volume as needed in response to comment 1.a. above.
4. Standard 4 requires that the stormwater system be designed to remove 80% Total
Suspended Solids (TSS) and to treat 0.5-inch of volume from the impervious area for water
quality.
a. TSS removal calculations are provided in Appendix I of the Drainage Report
including the TSS removal provided by the pretreatment practices prior to the
infiltration systems. HW recommends that the Applicant verify that the pretreatment
provides the 44% TSS removal in accordance with Standard 6 and adjust the design
as applicable.
5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant Loads
(LUHPPL).
a. The proposed development of 136 residential units is not considered a LUHPPL
therefore, Standard 5 is not applicable to this project.
6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone 11 or
an Interim Wellhead Protection Area of a public water supply.
a. A portion of the project site lies within the North Andover Watershed Protection
District, therefore Standard 6 is applicable. HW recommends that the Applicant verify
that the design complies with the requirements of Standard 6 as described in the
Massachusetts Stormwater Handbook, Chapter 1, Volume 1, page 15.
7. Standard 7 is related to projects considered Redevelopment.
a. The proposed development is considered a new development with an increase of
Impervious area, therefore Standard 7 is not applicable.
8. Standard 8 requires a plan to control construction related impacts including erosion,
sedimentation or other pollutant sources.
a. The Applicant has provided erosion control notes on Sheet CA, erosion control
locations on Sheet C.3, and details on Sheet CA HW recommends that the
Applicant verify that the contractor will use straw bales and not hay bales.
b. HW recommends that the Applicant include a note on the plans stating that soil
stockpiles must be kept outside of the 100-foot buffer zone.
9. Standard 9 requires a long-term operation and maintenance plan shall be developed and
implemented to ensure that stormwater management systems function as designed.
a. The Applicant has provided a long-term O&M Plan in the Drainage Report. The O&M
Plan should be a standalone document and include a simple sketch to clearly
indicate the location of all stormwater practices to be inspected as well as locations
for snow storage. HW recommends that the Applicant include a simple sketch that
will be provided to the property owner.
b. HW recommends that the property owner sign the O&M Plan in accordance with the
North Andover Stormwater Regulations.
11:%PrgjecIA12N 1311M65 N Andover On-Call\t 8065H 505 Sutton StreeAReports1190701_t st Pecr Review 505 Sutton Str,i&doex
i
I
Town of North Andover
July 1, 2019
Page 5 of 5
10. Standard 10 requires that an Illicit Discharge Compliance Statement be provided.
a. � The Applicant provided an Illicit Discharge Compliance Statement to be signed by
the engineer in Appendix H of the Drainage'Report. HW recommends that the illicit
discharge statement be signed by the property owner prior to land disturbance.
11, Miscellaneous Comments;
a. HW recommends that the Applicant evaluate the volume of stormwater runoff in
accordance with Section 7.2.B.f of the North Andover Stormwater Regulations. It
appears that the volume of stormwater discharging from the site at Design Point 1 in
Sutton Street increases over existing conditions, HW recommends that the Applicant
confirm that the municipal system has the capacity for the additional volume.
Conclusions
HW recommends that the Planning Board require that the Applicant address these comments
as part of the Board's review process. The Applicant is advised that provision of these
comments does not relieve him/her of the responsibility to comply with all Town of North
Andover Codes and By-Laws, Commonwealth of Massachusetts laws, and federal regulations
as applicable to this project. Please contact Janet Bernardo at 774-413-2999 ext 202 or at
jernardo@horsieywitten.com if you have any questions regarding these comments.
Sincerely,
HORSLEY WITTBN GROUP, INC.
111
Janet Carter Bernardo, P.E.
Senior Project Manager
CC: Amy Maxner, Conservation Administrator
HAProjecls1201S\18065 n'Andover On-CAM806511 505 Suitor%Sueet\Relwrts1190701_Ist Peer Review S05 Sutlon street.doex
it
Horsley p Witten Group
F 't
Sustainable Envir-onmental Solutions
204 Washington Street•Suite 801•8oston,MA02t08
857.263-8193•horsleywitten.cam
August 19, 2019
Ms. Monica Gregoire, Staff Planner
Planning Department
Town of North Andover
120 Main Street
North Andover, Massachusetts 01845
Ref: 2nd Stormwater Peer Review
505 Sutton Street
Town of North Andover
Dear Ms. Gregoire and Board Members:
The Horsley Witten Group, Inc. (HW) is pleased to provide the North Andover Planning Board
with this letter report summarizing our second review of the Drainage Report and Permitting
Plans for the proposed Multifamily Development at 505 Sutton Street, North Andover, MA
(Applicant). The plans were prepared for the Sutton Street Redevelopment, LLC (Applicant) by
The Morin-Cameron Group, Inc. HW understands that the Applicant is proposing to construct
three multifamily residential buildings and associated surface and underground parking,
landscaping improvements, a stormwater management system and new utility infrastructure on
a 5.10-acre parcel. The south and eastern portions of the site are currently undeveloped. There
are no wetlands on-site, however at the south side of the site there is a buffer zone that is
associated with an isolated wetland that is located off-site.
The following documents and plans were received by HW in response to our July 1, 2019 initial
peer review:
• Stormwater Response Letter, Application for Site Plan Approval, 505 Sutton Street/Sutton
Street Redevelopment, LLC, prepared by The Morin-Cameron Group, Inc., dated August 13,
2019;
• Response to TEC Comments, Application for Site Plan Approval, 505 Sutton Street/Sutton
Street Redevelopment, LLC, prepared by The Morin-Cameron Group, Inc., dated August 13,
2019;
• Proposed Conditions HydroCAD model results for the 1" and the 2-,10-, 25- and 100-year
storms, printed August 13, 2019;
• Supplemental Stormwater Management Calculations, regarding Standard 3, revised August
13, 2019;
• Proposed Gravity Sewer Calculations, prepared by The Morin-Cameron Group, Inc., dated
July 26, 2019;
• Stormwater Management Key Plan, prepared by The Morin-Cameron Group, Inc., dated
August 13, 2019;
I
i
Hors leyWitlen.com 91(fr;HorsleyWittenGroup IM Horsley Witten Group, Inc.
Town of North Andover
August 19, 2019
Page 2of6
• Senior Center 2019 Snapshot Daily Traffic, dated July 19, 2019;
• Traffic Peer Review#11, 505 Sutton Street, prepared by TEC, dated August 12, 2019;
• Supplemental Memorandum, Proposed Adult Community Center, 477 Sutton Street, North
Andover, MA, prepared by Vanesse & Associates, dated August 1, 2019;
• Supplemental Information, Proposed Adult Community Center, 477 Sutton Street, North
Andover, MA, prepared by Vanesse & Associates, dated August 1, 2019;
• Multifamily Site Development Plans, 505 Sutton Street, North Andover, Massachusetts,
prepared by The Morin-Cameron Group, Inc., dated May 16, 2019, revised August 13, 2019,
which include:
o Cover Sheet C.1
o Existing Conditions Plan C.2
o Site Preparation and Erosion Control Plan C.3
o Site Layout Plan CA
o Grading & Drainage Plan C.5
o Utility Plan C.6
o Soil Test Pit Logs Plan C.7
o Construction Details 1 C.8
o Construction Details 11 C.9
o Construction Details III C.10
o Construction Details IV CA I
o Construction Details V C.12
o Construction Details VI C.13
Stormwater Management Design Peer Review
The comments below correlate to our initial review letter dated July 1, 2019. Follow up
comments are provided in bold font:
1. Standard 9 states that no new stormwater conveyances (e.g. outfalls) may discharge
untreated stormwater directly to or cause erosion in wetlands or waters of the
Commonwealth.
a. The Applicant has analyzed the existing and proposed stormwater discharge rates
from the project site at the property boundaries. At the south property boundary, the
development discharges stormwater overland towards an isolated vegetated
wetland. The flow is not significant towards this resource area and erosion is not
anticipated.
The Applicant has responded that the Site does not drain towards the offsite
wetland in either the existing or proposed condition. There is an existing berm
along the edge of the property that directs the water towards the east property
line, away from the edge of the isolated vegetated wetland. WW recommends
that the Applicant note the berm on the site plans with a statement that the
berm will remain as existing.
II:lProj�cls12p1311 RUGS i�'Ando�er On-Cail118UC;5[l SUS Sutton StreetlRepurtc119U819_Zttd Pe4 Re`icu•SOS Sutton Strezt.docx
i
Town of North Andover
August 19, 2019
Page 3 of 6
b. The Applicant will also be discharging a majority of the proposed flow towards the
municipal drainage system in Sutton Street. To verify that the outlet of the municipal
system will not cause erosion in waters of the Commonwealth HW recommends that
the Applicant provide a narrative describing where the municipal system currently
outlets and document that no erosion is currently occurring.
The Applicant has responded that the municipal system outlets off the south
side of Osgood Street. A field visit conducted by The Morin-Cameron Group,
Inc. identified this area as densely vegetated. No outlet structure was identified
and there was no sign of erosion or scour at the record outlet locations. The
field crew followed the topography to the nearest wetland and did not observe
any erosion in or upstream of the wetlands.
2. Standard 2 requires that stormwater management systems shall be designed so that post-
development peak discharge rates do not exceed pre-development peak discharge rates.
a. The Applicant has provided clear documentation to illustrate that the post-
development peak discharge rates do not exceed pre-development rates. However,
the bottom of the stone for each subsurface system listed on Sheet C.12 does not all
correlate with the bottom of the stone elevations provided in the HydroCAD modeling
calculations. HW recommends that the Applicant revisit the plan and calculations for
Infiltration Systems#2, #3, and #4, as well as Detention System #1.
The Applicant has revised the locations and elevations of the subsurface
stormwater practices to demonstrate compliance with the 2 feet separation to
groundwater. For clarity HW recommends that the Applicant properly label 4P
in the HydroCAD model as Detention System #1 and 5P as Infiltration System
#4.
b. For clarity HW recommends that the Applicant list the Retain-It chamber size on
Sheet C.12 for each of the individual systems and verify that the correlating details
are provided on Sheet C.13.
The Applicant has listed the Retain It dimensions and total number of units for
the five subsurface systems on Sheet C.12. The heights listed include 2.67',
3.17', 4.17', and 4.67 . The Details provided on Sheet CA 3 indicate the heights
to be 3'8" and 4'8". It appears that the Retain It Chambers comes in variable
heights, HW recommends that the Applicant confirm that the heights proposed
for the various systems are available as noted.
c. The Applicant has conducted soil evaluations within each of the subsurface systems
and has provided the soil logs on Sheet C.7. HW requests that the surface elevations
of the test pits within the infiltration systems be added to the test logs. When
responding to comment 2.a, above HW recommends that the Applicant verify that it
is providing adequate separation to groundwater from the bottom of the stone,
specifically for Infiltration Systems#3 and #4.
The Applicant has provided the existing surface elevations of the test pits on
Sheet C.7 as requested.
d. The Applicant has regraded the entire site including along the western, southern, and
eastern property boundaries. Under existing conditions, the stormwater flows within
1
ILTrojecls120 1 811 8 0 6 5 N Andover On-C:aIN 806511 505 Sutton St reel\Reports1190819 2nd I'ce+ Revim SOS Sutton&rcet.duux
Town of North Andover
August 19, 2019
Page 4of6
the site boundaries towards 419 Surry Drive (west boundary) and #946 Osgood
Street (east boundary). Under proposed conditions the site sheet flows towards
additional abutting properties, including #25, #35, #43, #51, and #59 Surrey Drive.
HW recommends that the Applicant clarify whether the abutting property owners will
receive more stormwater under proposed conditions than they do under existing
conditions.
The Applicant has stated that the intent of the grading along the property
boundaries is to direct all water back towards design point 3 or the catch
basins in the parking area. The Applicant stated further, that Sheet C.4 has
been revised to add flow arrows. However, HW was not able to locate the flow
arrows. HW recommends that the Applicant add a note for the contractor to
grade the areas adjacent to the property boundaries to direct runoff into the
parking lot.
The Applicant also notes, that#51 and #59 Surrey Drive receive no stormwater
during existing or proposed conditions due to the existing berm described in
response 1.a. Due to the reduced tributary area, #25, #35, &##43 Surrey Drive
will receive less runoff. The grades along this area of the site promote sheet
flow from vegetated areas only. HW is satisfied that the Applicant will not be
directing more stormwater onto the adjacent properties than under existing
conditions.
3. Standard 3 requires that the annual recharge from past-development shalt approximate
annual recharge from pre-development conditions.
a. In Appendix D of the Drainage Report, the Applicant has provided calculations to
demonstrate that the infiltration systems are sized to capture and recharge the
groundwater recharge volume for HSG C generated from the new impervious area.
HW recommends that the Applicant revise the calculations for the provided recharge
volume as needed in response to comment 1.a. above.
The Applicant has provided the groundwater recharge calculations as
requested.
4. Standard 4 requires that the stormwater system be designed to remove 80% Total
Suspended Solids (TSS) and to treat 0.5-inch of volume from the impervious area for water
quality.
a. TSS removal calculations are provided in Appendix I of the Drainage Report
including the TSS removal provided by the pretreatment practices prior to the
infiltration systems. HW recommends that the Applicant verify that the pretreatment
provides the 44% TSS removal in accordance with Standard 6 and adjust the design
as applicable.
The Applicant is infiltrating clean roof runoff or has provided at least 44% TSS
removal prior to infiltration.
5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant Loads
(LUHPPL). ,
H:Trojcc(NU0 I 8\18065 N Andover Opt-Ca11118065H 505 Sutton Street\Reports1190819 ?nd Peer Review 505 Sutton Street.doex
1
E
Town of North Andover
August 19, 2019
Page 5 of 6
i
a. The proposed development of 136 residential units is not considered a LUHPPL
therefore, Standard 5 is not applicable to this project.
No further comment is needed.
6. Standard&is related to projects with stormwater discharging Into a critical area, a Zone 11 or
an Interim Wellhead Protection Area of a public water supply.
i
a. A portion of the project site lies within the North Andover Watershed Protection
District, therefore Standard 6 is applicable. HW recommends that the Applicant verify
that the design complies with the requirements of Standard 6 as described in the
Massachusetts Stormwater Handbook, Chapter 1, Volume 1, page 15.
The Applicant has stated that the requirements of the District have been
reviewed with North Andover Planning staff and the project is not within the
North Andover Watershed Protection District.
7. Standard 71s related to projects considered Redevelopment,
a. The proposed development is considered a new development with an increase of
impervious area, therefore Standard 7 is not applicable.
No further comment is needed.
8. Standard&requires a plan to control construction related impacts including erosion,
sedimentation or other pollutant sources.
a. The Applicant has provided erosion control notes on Sheet C.1, erosion control
locations on Sheet C.3, and details on Sheet CA HW recommends that the
Applicant verify that the contractor will use straw bales and not hay bales.
The Applicant has revised the hay bales to specify 12-inch mulch sock.
b. HW recommends that the Applicant include a note on the plans stating that soil
stockpiles must be kept outside of the 100-foot buffer zone.
The Applicant has revised the Construction Sequence and Erosion and
Sedimentation Control notes on Sheet CA as requested.
9. Standard 9 requires a long-term operation and maintenance plan shall be developed and
implemented to ensure that stormwater management systems function as designed.
a. The Applicant has provided a long-term O&M Plan in the Drainage Report. The O&M
Plan should be a standalone document and include a simple sketch to clearly
indicate the location of all stormwater practices to be inspected as well as locations
for snow storage. HW recommends that the Applicant include a simple sketch that
will be provided to the property owner.
The Applicant has added a Stormwater Management Key Plan, which has been
added to the long-term O&M Plan.
b. HW recommends that the property owner sign the O&M Plan in accordance with the
North Andover Stormwater Regulations.
H:IPruiccis12018\IS065 N''Andover Oil-Ca[AI806SH 505 Sullen Stcu Repoi-1, 1908t9_2nd Peer Rovien'505 Sullen Slro2IAoe x
i
i
Town of North Andover
August 19, 2019
Page 6of6
The Applicant has stated that the O&M Plan will be signed prior to
construction. The Planning Board may choose to list this as a condition of
approval.
10. Standard 10 requires that an Illicit Discharge Compliance Statement be provided,
a. The Applicant provided an Illicit Discharge Compliance Statement to be signed by
the engineer in Appendix H of the Drainage Report. HW recommends that the illicit
discharge statement be signed by the property owner prior to land disturbance.
The Applicant has stated that the Illicit Discharge Statement will be signed
prior to construction. The planning Board may choose to list this as a
condition of approval.
11. Miscellaneous Comments:
a. HW recommends that the Applicant evaluate the volume of stormwater runoff in
accordance with Section 7.2.B.f of the North Andover Stormwater Regulations. It
appears that the volume of stormwater discharging from the site at Design Point 1 in
Sutton Street increases over existing conditions. HW recommends that the Applicant
confirm that the municipal system has the capacity for the additional volume.
The Applicant has provided adequate reasoning and calculations to illustrate
that the stormwater discharge to Sutton Street will not negatively impact the
municipal stormwater system.
Conclusions
HW recommends that the Planning Board require that the Applicant address the remaining
minor comments as part of the Board's review process. The Applicant is advised that provision
of these comments does not relieve himlher of the responsibility to comply with all Town of
North Andover Codes and By-Laws, Commonwealth of Massachusetts laws, and federal
regulations as applicable to this project. Please contact Janet Bernardo at 774-413-2999 ext
202 or at jernardo@horsleywitten.com if you have any questions regarding these comments.
Sincerely,
HORSLEY WITTEN GROUP, INC.
Rill
Janet Carter Bernardo, P.E. Maria Pozimski
Senior Project Manager Staff Planner
CC: Amy Maxner, Conservation Administrator
H:\Pcvjec(.1201 N 8065 N1 Aiidove�-On-Cal I\1800511505 Salton StreetlRcparts\1908I9_2nd Peer Rzview 505 SIMOLl Street. L)CX