HomeMy WebLinkAbout- Consultant Review - 1600 OSGOOD STREET 10/10/2019 Horsley Wiften Croup
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October 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 second 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 in response to our September 10,
2019 initial peer review letter:
• Stormwater Management Report for Proposed Redevelopment, 1600 Osgood Street, North
Andover, Massachusetts, prepared by Langan Engineering & Environmental Services, Inc.,
dated August 2019 and revised October 3, 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 and revised October 4,
2019, which include:
o Grading and Drainage Plans I —VI CG101-CG108
o Drainage Structure Reference Sheet I — III CG201-CG
o Grading and Drainage Details I — III CG501-503
o Compensatory Storage Plans Overall — II CG800-802
o Soil Erosion and Sediment Control Plan (Phase 1) 1 — III CE101-CE103
o Soil Erosion and Sediment Control Plan (Phase 2) 1 — III CE201-CE203
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Town of North Andover
October 10, 2019
Page 2 of 7
o Soil Erosion and Sediment Control Plan (Phase 3) 1 — III CE301-CE303
o Soil Erosion and Sediment Control Details I — II CE501-502
• Preliminary Geotechnical Engineering Study for 1600 Osgood Street, North Andover,
Massachusetts, prepared by Langan Engineering & Environmental Services, Inc., dated
November 28, 2018;
• Memorandum Re: Stormwater Review of 1600 Osgood Street, North Andover,
Massachusetts, prepared by Langan Engineering & Environmental Services, Inc., dated
October 3, 2019.
Stormwater Management Design Peer Review
The comments below correlate to our initial peer review letter dated September 10, 2019.
Follow up comments are provided in bold font:
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.
The Applicant has provided images of the proposed discharge locations, three
existing concrete bulk heads and one existing 42-inch RCP that discharged
directly into the Merrimack River. The Applicant has demonstrated that no
erosion is currently exhibited at the outfall locations, and that the proposed
stormwater management system will reduce peak runoff rates for the 2-year
storm event at these outfalls. No further comment is needed.
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 CG103. The 10"
overflow pipe on the drawing has an invert of 41.5', 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.
The Applicant has revised Sheet CG 103 and Sheet CG203 to specify
an invert of 41.55' for the 10" overflow pipe, consistent with
Hydraflow. No further comment is needed.
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Town of North Andover
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• Pond A-1.2 does not reflect raingarden A-1.2 on Sheet CG106. 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.
The Applicant has revised both the plan and the model to feature an
8" outlet pipe at elevation with a 5.7% slope. No further comment is
needed.
• Pond A-1.4 does not reflect extended dry detention basin A-1.4 on Sheet
CG106. 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'.
The Applicant has revised the plan to reflect the outlet dimensions
and elevations featured in the Hydraflow model. No further comment
is needed.
• Pond A-1.5 does not reflect raingarden A-15 on Sheet CG106. 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.
The Applicant has revised the plan to reflect the 8" pipe of the model.
No further comment is needed.
• Sheet CG107 labels the wet pond as "A-S", which should be labeled "A-2".
The Applicant has revised the plan with wet pond A-2 relabeled. No
further comment is needed.
• The emergency spillway invert elevation is not labeled for Pond B-1 on
Sheet CG108. 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.
The Applicant has revised the plans to include the invert elevation for
the emergency spillway and has adjusted the label for OCS B-1 to
avoid text conflicts. No further comment is needed.
• Pond C-2, Sheet CG105 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.
The Hydraflow model has been revised such that Pond C-2 now has a
top elevation of 39.70', consistent with Sheet CG105. No further
comment is needed.
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.
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Town of North Andover
October 10, 2019
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The Applicant has provided two details, "Performed Scour Hole for Pipes
Larger than 24"" and "Stone Pipe ends For Pipes 24" and Less in Dia." on
Sheet CG502. The details provide dimensions for splash pads and stone sizing
for various outlet pipe diameters. No further comment is needed.
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.
The Applicant has adjusted Swale A-2.2 to be modeled as 1-foot deep with 1-
foot of freeboard and has revised the report. No further comment is needed.
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.
The Applicant has indicated that stormwater runoff generated from Osgood
Street are captured by curbing and catch basins placed along site entrances.
As such, the Applicant did not identify these areas as contributing factors to
the drainage area and has maintained the original drainage area used. No
further comment is needed.
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.
No further comment is needed.
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.
No further comment is needed.
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
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Town of North Andover
October 10, 2019
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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.
No further comment is needed.
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.
No further comment is needed.
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.
No further comment is needed.
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.
No further comment is needed.
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.
No further comment is needed.
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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Town of North Andover
October 10, 2019
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The Applicant has separated the erosion and sediment control plans into three
phases (CG 100, 200, and 300 series). Phase 1 pertains to initial construction
staging and site demolition; Phase 2 pertains to mass earthwork, retaining wall
construction and pad preparation; and Phase 3 pertains to utility installation,
building construction, paving, and Landscaping. The Applicant has indicated
that this phasing is meant to allow the contractor flexibility to proceed with
each phase according to the overall project schedule. No further comment is
needed.
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.
The Applicant has provided a BMP and Snow Storage Location Map
("Stormwater Management Features") in the Stormwater Management Report
and has indicated that the property owner will sign the plan as a condition of
its approval. No further comment is needed.
b. HW requests that the Applicant clarify how solid waste will be removed from the
property. Is there a need for dumpsters?
The Applicant has indicated that a trash compactor will be installed at the
proposed loading bay along the northwestern face of existing building 20 on
Lot A. Further, the Applicant has stated that Lot B will manage all solid waste
from the proposed distribution facility internally. Both Lots will coordinate with
waste disposal services to transport waste offsite, in accordance with
municipal and state regulations. No further comment is needed.
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.
The Applicant has included illicit discharge compliance statements for Lots A
and B and has noted that final signatures will be included as a condition of the
project's approval. HW recommends that the Board require the Applicant to
provide a signed illicit discharge compliance statement prior to any earth
disturbance on-site. No further comment is needed.
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.
The Applicant has indicated that the sump pump will be used to elevate
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Town of North Andover
October 10, 2019
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stormwater runoff from the subcatchment that contributes to the truck well.
The Applicant has set the proposed truck well drainage structure at an
elevation that prevents stormwater from reaching the retention system through
gravity conveyance alone. No further comment is needed.
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.
The Applicant has indicated that abutter information is located on Sheet
VL101: "ALTA/NSPS Land Title Survey." No further comment is needed.
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
The Applicant has included a volume discharge comparison in Table 3 of
Section 2.6 in the revised Stormwater Management Report. No further
comment is needed.
Conclusions
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.
yp r Y
Renee L Bourdeau, PE Janet Carter Bernardo, P.E.
Senior Project Manager Senior Project Manager
CC: Conservation Administrator
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