HomeMy WebLinkAbout09/10/2019 - HWG Stowmwater Review - - 1450 Osgood Street norsley W'Iften Group
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Sustainable, Ehvirontnental Solution's
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September 10, 2019
Ms. Monica Gregoire, Staff Planner
Planning Department
Town of North Andover
120 Main Street
North Andover, Massachusetts 01845
Ref: 1600 Osgood 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 Stormwater Management Report and
Permitting Plans for the proposed redevelopment of 1600 Osgood Street, North Andover, MA.
The plans were prepared for Hillwood Enterprises, L.P. (Applicant) by Langan Engineering &
Environmental Services, Inc. HW understands that the Applicant is proposing to redevelop a
167.8-acre site and will reconfigure the lot into three lots (A, B, and C) and a subdivision
roadway (Lot D). Lot B, approximately 110 acres is proposed to be redeveloped into an e-
commerce warehouse, storage and distribution facility along with parking, landscaping, and
other improvements. Lot C consisting of 30 acres, existing roof-mounted solar energy facilities
currently located on Building 70, as well as all existing ground-mounted solar energy facilities
will be relocated to this lot. Lot D, approximately 1.06 acres, is being proposed as a subdivision
roadway to provide street frontage and limited access for proposed Lot C.
The following documents and plans were received by HW:
• Stormwater Management Report for Proposed Redevelopment, 1600 Osgood Street, North
Andover, Massachusetts, prepared by Langan Engineering & Environmental Services, Inc.,
dated August 2019;
• Permit Site Plans — North Andover, Massachusetts, Proposed Redevelopment for Hillwood
Enterprises, L.P. and 1600 Osgood Street, LLC., Distribution Facility, prepared by Langan
Engineering & Environmental Services, Inc., dated August 8, 2019, which include:
o Cover Sheet CS001
o Master Legend & Notes CS002
o Alta/NSPS Land Title Survey VL101-VL113
o Lot Line Adjustment Factor VB201
o Site Plans Overall - VI I I CS 100-CS 108
o Site Details I —VI CS501-506
o Grading and Drainage Plans Overall —VII CG100-CG108
o Grading and Drainage Details 1-111 CG501-503
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Town of North Andover
September 10, 2019
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o Compensatory Storage Plans Overall — II CG800-802
o Utility Plans Overall —VI I CU 100-108
o Utility Details I CU501
o Soil Erosion and Sediment Control Plan Overall —VIII CE100-CE108
o Soil Erosion and Sediment Control Details I — 11 CE501-502
o Planting Plan Overall —VIII LP100-108
o Planting Plan Details 1-11 LP501-502
o Lighting Plan Overall —VIII LL100-108
o Lighting Details I LL501
o Architectural Site Plan G-100
o Overall Ground Floor G-101
o Overall Mezz Floor G-102
o Overall RSP Level 2 - 5 G-103-106
o Overall Roof Plan G-107
o Building Sections G-108
o Sections G-108a
o Building Elevations G-109-109a
o Enlarged Plans G-110
o Cover Sheet A-001
o Egress Plans — Levels 2 and 3 A-002 —A-003
o Demo— Elevation A-011
o Floor Plans Building 20 & 21 A-100
o Partial Floor Plan — Building 20 & 21 A-D A-210 - 213
o Elevations Building 20 & 21 A-300
o Elevations A-301
o Renderings A-500
• Preliminary Subdivision Plan, Distribution Facility, 1600 Osgood Street, Map 34, Lot 54 &
55, Town of North Andover, Essex County, Massachusetts, prepared by Langan
Engineering & Environmental Services, Inc., dated August 8, 2019, which include:
o Cover Sheet CS001
o Legend, Notes, Section & Profiles CS002
o Subdivision Plan VL100
o Layout, Grading & Utility Plan CS100
• Special Permit— Site Plan Review—Application for Lot A, dated August 9, 2019 (43 pages);
• Special Permit— Site Plan Review—Application for Lot B, dated August 9, 2019 (49 pages);
• Town of North Andover Planning Board Application for Large-Scale Ground-Mounted Solar
Energy System Site Plan Review and Setback Modification Special Permit, dated August 9,
2019 (44 pages);
• Application for Preliminary Subdivision Approval, 1600 Osgood Street LLC, prepared by
Smolak & Vaughn LLP, dated August 8, 2019; and
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• Preliminary Geotechnical Engineering Study for 1600 Osgood Street, North Andover,
Massachusetts, prepared by Langan Engineering & Environmental Services, Inc., dated
November 28, 2018.
Stormwater Management Design Peer 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.
1. Standard 1 states that no new stormwater conveyances may cause erosion in wetlands of
the Commonwealth.
a. The Applicant will utilize existing discharge points from the site and create no new
discharges. The Applicant has not demonstrated that there is sufficient outlet
protection at the existing culvert locations to withstand projected velocities from the
2-year storm event. HW recommends that the Applicant provide these calculations
and if necessary, calculations for the sizing of riprap aprons.
2. Standard 2 requires that post-development runoff does not exceed pre-development runoff
off-site. For a redevelopment project per MassDEP this standard must be met to the
maximum extent practicable.
a. Based on review of the Hydraflow Report and drawings, HW has the following
comments:
• Pond D-1 does not reflect infiltration basin D-1 on Sheet GC103. The 10"
overflow pipe on the drawing has an invert of 41.51, whereas in Hydraflow it
is listed at 41.55'. The length of the 10" pipe also does not reflect the length
in the model. The model shows an 8" outlet structure at elevation 41.25 and
a weir at elevation 42.5' marked as inactive which are not shown on Sheet
GC103. HW recommends that the Applicant reconcile the model with the
drawings.
• Pond A-1.2 does not reflect raingarden A-1.2 on Sheet CG 106. The
drawings show a 4" underdrain at elevation 47.50 with a zero percent slope,
whereas the model shows an 8" pipe at elevation 47.50 with a 2% slope.
• Pond A-1.4 does not reflect extended dry detention basin A-1.4 on Sheet
CG 105. The drawing shows a 4" orifice at elevation 40' and a 4" underdrain
at invert elevation 47.5'. The model shows a 4" orifice at elevation 41, 8-
inch orifice at elevation 39'.
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• Pond A-1.5 does not reflect raingarden A-15 on Sheet CG 106. The
drawings show a 4" underdrain at elevation 41.0 with a zero percent slope,
whereas the model shows an 8" pipe with a 1% slope.
• Sheet CG 107 labels the wet pond as "A-S", which should be labeled "A-2".
• The emergency spillway invert elevation is not labeled for Pond B-1 on
Sheet CG 108. The leader for the outlet structure (OCS B-1) has a conflict
with the wetland limit lines, which blocks the invert elevation for the (2) 24"
pipes.
• Pond C-2, Sheet CG 105 indicates that the top of the pond is at elevation
39.70', whereas the model shows 39.50'. The leader for OCS C-2 and
associated orifices and pipes do not match what is in the Hydraflow model.
HW recommends that the Applicant reconcile the model with the drawings.
b. The Applicant provides flared end sections and outlet protection for all pipes
discharging into ponds or raingardens; however, calculations and associated size of
the stone has not been provided. HW recommends that the Applicant provide the
size of the stone and supporting calculations.
c. The Applicant provided sizing calculations for Grass Swale A-1.2 and indicates that
the swale should be 2-feet deep with 1-foot of freeboard; however, the swale is
modeled as 1-foot deep. HW recommends that the Applicant revise the model to
accurately reflect the design.
d. In both the existing condition and proposed condition subcatchment areas, potential
run-on to the project area from adjacent properties of the parcel is not captured in the
calculations. HW recommends that the Applicant extend the watershed boundaries
beyond the limit of work and property lines to quantify potential run-on to the project.
e. The Applicant has not included test pit information including groundwater elevation
and infiltration rates under each of the proposed infiltration systems in the
Stormwater Management Report. On page 12 of the Stormwater Management
Report, the Applicant indicates that additional testing will be required to confirm
groundwater elevation and infiltration rates. HW recommends that if the Board
approves this Applicant, they include a condition that requires the Applicant to
provide estimated seasonal high groundwater elevation and infiltration rates in the
proposed location of the infiltration systems for the Board to review, prior to
construction of these practices.
3. Standard 3 requires that the annual recharge from post-development shall approximate
annual recharge from pre-development conditions.
a. The Applicant indicates that an Activity Use Limitation (AUL)for portions of the site
prohibits groundwater recharge. Therefore, recharge in areas where an AUL exists
has been compensated for through infiltration practices located in areas outside of
the AUL. Proposed practices within the AUL have been lined to prevent infiltration.
The Applicant has provided enough groundwater recharge to meet Standard 3.
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September 10, 2019
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4. Standard 4 requires that the stormwater system be designed to remove 80% Total
Suspended Solids (TSS) and to treat 0.5-inches of volume from the impervious area for
water quality.
a. The site is considered a Land Use of Higher Potential Pollutant Load (Standard 5),
therefore the Applicant is required to treat 1.0-inches of the impervious area for water
quality. The Applicant has elected to treat 1.0-inch for the parking areas and 0.5-inch
for rooftops. The Applicant has provided practices to manage the water quality
volume to meet the requirements under Standard 4.
b. TSS calculations are provided in the Stormwater Management Report and indicate
that all proposed BMPs meet the 80% reduction in TSS except for Pond A-1.4 (72%).
Since the project is a redevelopment, the Applicant needs to meet this standard to
the maximum extent practicable. Based on review of the information presented, it
appears that the Applicant has met the requirement to the maximum extent
practicable.
5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant Loads
(LUHPPL).
a. The Applicant has stated that because the project will generate more than 1,000
vehicle trips per day for both Lot A and Lot B, the site is considered a high pollutant
load generator. Therefore, the Applicant has increased the WQv (Standard 4)for the
parking associated with Lots A and B from 0.5 inches to 1.0 inches. Further, any
proposed rain gardens within the AUL zone have been lined to prevent infiltration.
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. The project site does not discharge into a critical area therefore Standard 6 is not
applicable to this project.
7. Standard 7 is related to projects considered Redevelopment.
a. The project site is considered a redevelopment. Therefore the Applicant is required
to meet the following Stormwater Management Standards only to the maximum
extent practicable: Standard 2, Standard 3, and the pretreatment and structural best
management practice requirements of Standards 4, 5, and 6. Existing stormwater
discharges shall comply with Standard 1 only to the maximum extent practicable. A
redevelopment project shall also comply with all other requirements of the
Stormwater Management Standards and improve existing conditions.
Once the Applicant addresses the comments in this letter, HW believes that the
proposed project will comply with Standard 7.
8. Standard 8 requires a plan to control construction related impacts including erosion,
sedimentation or other pollutant sources.
a. HW recommends that the Applicant include a construction sequence on the Plan
Set, specifically noting the methods to control erosion as required in Section 8.2 of
the North Andover Stormwater Management and Erosion Control Regulations.
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9. Standard 9 requires a Long-Term Operation and Maintenance (O & M) Plan to be provided.
a. The Applicant has provided an O&M Plan with a Log Form and budget. HW
recommends that the Applicant provide a BMP Location Map (with snow storage
locations) and that the O&M Plan be signed by the property owner.
b. HW requests that the Applicant clarify how solid waste will be removed from the
property. Is there a need for dumpsters?
10. Standard 10 requires an Illicit Discharge Compliance Statement to be provided.
a. The Applicant provided an Illicit Discharge Compliance Statement as Appendix I in
the Stormwater Management Report; however, the owner, address, telephone
number and signature are missing. HW recommends that the Applicant provide a
complete illicit discharge statement signed by the property owner prior to any land
disturbance.
11. Miscellaneous Comments:
a. Sheet CG103 shows a sump pump at MH4 which ultimately discharges to the closed
storm drain network. It is unclear what the sump pump will be used for. HW
recommends that the Applicant provide additional information on the use of the sump
pump and the nature of the water to be pumped to the storm drain network.
b. In accordance with Town Regulations, the Applicant should include the names of the
abutters on the plan set. HW recommends that the Applicant include the abutters
names per Section 7.1 d) of the North Andover Stormwater Management and
Erosion Control Regulations.
c. In accordance with Town Regulations, the Applicant should compare total volume of
discharge at each control point for the design storms. HW recommends that the
Applicant include the total volume pre- and post-development per Section 7.2.B.f of
the North Andover Stormwater Management and Erosion Control Regulations
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 Renee Bourdeau at 774-413-2900 ext. 402 or at
rourdeau@horsleywitten.com if you have any questions regarding these comments.
Sincerely,
HORSLEY WITTEN GROUP, INC.
,a
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Renee L Bourdeau, PE Janet Carter Bernardo, P.E.
Senior Project Manager Senior Project Manager
CC: Conservation Administrator
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