38A-104 (10) r< STORMWATER MANAGEMENT PERMIT
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City of Northampton APPLICATION DECISION
Department of Public Works
Project/ Site Name: Village Hill (Phase 2)
Project Street or Location/Assessor ID: Former State Hospita ro ert North Campus),
Vill
Applicant Name: TCB Hospital Hill, LLC c/o The Community Builders
Applicant Address/Phone: 95 Berkley Street, Boston MA 02116-6240/413-731-9790
Owner Name: Hospital Hill Development LLC c/o MassDevelopment
Owner Address/Phone: 33 Andrews Parkway Devens MA 01432/978-784-2917
Application Submission Date: 4/4/2007
THE FOLLOWING ACTION BY THE NORTHAMPTON DEPARTMENT OF PUBLIC
WORKS HAS BEEN TAKEN ON THIS APPLICATION BASED ON INFORMATION
PRESENTED:
Disapproval of the Stormwater Management Permit Application based on a
determination within seven days of the receipt of the application that the
application is administratively incomplete (see attached documentation).
Approval of the Stormwater Management Permit Application.
X Approval of the Stormwater Management Permit Application subject to any
conditions, modifications or restrictions required by the Department of
Public Works (see below)
Disapproval of the Stormwater Management Permit Application based upon
a determination that the proposed plan, as submitted, does not meet the
purposes set forth in the Northampton Stormwater Management.
Standard Permit Conditions:
1. All clearing, grading, drainage, construction, and development shall be conducted in
strict accordance with the following plans and information submitted with the application
and as amended by any conditions attached to this permit:
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a. Village Hill, Northampton, Massa0husetts, Definitive Subdivision Plan, Sheets
0.1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.01 i3.1, 4.1, 4.2, 4.3, 4.4, 5.1, 5.2, 5.4, 5.5, 6.0, 7.1,
7.2, 7.3, 7.4 Revised 4/4/2007, Sheet 3.2 revised 5/31/2007, Sheet 5.3 revised
6/7/2007, and Sheet 5.6 dated 6/12/2007, by Berkshire Design Group, Inc.,
stamped by Mark B. Darnold, P.E., Berkshire Design Group, Inc.
b. Stormwater Drainage Report Booklet for Village Hill, Northampton,
Massachusetts, dated 4/4/2007, stamped by Marc S. D'Urso, P.E., Berkshire
Design Group, Inc.
c. Stormwater Drainage Report for Musante Drive (South), dated 6/7/2007, stamped
by Mark B. Darnold, P.E., Berkshire Design Group, Inc.
d. Additional Test Pits (104 & 105), dated 6/13/2007, performed and submitted by
Marc S. D'Urso, P.E., Berkshire Design Group, Inc.
e. Revised Stormwater Drainage Calculations, dated 6/12/2007, stamped by Mark B.
Darnold, P.E., Berkshire Design Group, Inc.
2. The Northampton Department of Public Works (DPW) or its authorized representative
shall be provided access to the property to conduct inspections before, during, and after
construction activities as necessary. The applicant shall arrange with the DPW to
schedule the following inspections: Initial Inspection, Erosion Control Inspection, Bury
Inspection, and Final Inspection. The DPW may also conduct random inspections to
ensure effective control of erosion and sedimentation during_all_phase_s___o_feonstruction.
3. At the completion of the work, including construction of stormwater management
facilities and landscaping, the applicant shall submit a statement to the DPW from a
professional engineer of record in the Commonwealth of Massachusetts certifying that
the materials and construction of the stormwater management system was constructed in
accordance with the approved plans and will function as designed. All changes to the
approved stormwater facilities shall be documented by a professional engineer of record
in the Commonwealth of Massachusetts and approved by the DPW prior to submission of
the certification statement described above.
4. Annual Reports that are stamped by a Registered Professional Engineer documenting the
actions completed as required by the Operation, Maintenance and Inspection Agreement
shall be submitted to the Northampton Department of Public Works by October 1" of
each year.
5. If construction of the proposed stormwater system has not started within five years of the
issue date of this permit, then the permit will expire and a new permit will be required.
Construction is defined as clearing, grading, excavation, filling, and installation of
drainage structures on the lots specified in this permit.
Specific Permit Conditions:
1. Prior to issuance of a Building Permit, the applicant shall record an executed Stormwater
Operation, Maintenance, and Inspection Agreement that is binding on all subsequent
owners of land served by the private stormwater management facility by recording it in
the land records of the Registry of Deeds. This agreement shall be approved by the
Northampton DPW and signed by the owner and the Mayor of Northampton. Section 22-
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85 of the Northampton Stormwater Management Ordinance provides additional guidance
for the requirements of this agreement.
2. This project will be required to submit one or more Notice of Intent (NOI) to the U.S.
EPA for coverage under the NPDES Stormwater Construction General Permit. A copy of
the final NOI and Stormwater Pollution Prevention Plan (SWPPP) shall be submitted to
the Northampton DPW prior to the start of construction and prior to issuance of a
building permit.
3. The plans and specifications approved by this Permit include roadways and conceptual
impervious surface areas for site development. During the Site Plan approval, 40R site
approval, or any other permitting for each lot, the applicant must submit documentation
to the Northampton DPW of the proposed drainage system for the site, the impervious
surface footprint of the site, and a revised summary of impervious surface areas built,
proposed, and available for future construction for the sub-watershed drainage area where
the proposed lot development is taking place. At certain stages (to be agreed on by the
applicant and the DPW) of the build-out of the lots, the applicant shall be required to
submit revised drainage calculations that reflect the actual construction that has been
completed and confirms the remaining capacity of the Detention Basins in each Sub-
Watershed area. If the overall size of the impervious surface footprint proposed for each
— ---_---_--_ _sub-watershed-as defined-in-the-drainage calculations-is-greater-thanthe-area-specified-in---
the
n-the approved drainage calculations or if the drainage system is changed in a substantive
way, the applicant shall be required to submit revised plans and drainage calculations and
may be required to submit a new application for a Northampton Stormwater Management
Permit for the proposed site plan.
4. The Existing Conditions Plan Sheet 1.2 shows a Sediment Forebay in Detention Basin 1.
The DPW has commented in the review of As-Built plans for this Detention Basin to the
applicant that this forebay does not appear to be constructed. Due to the level of the
permanent pond in the Detention Basin, it is apparent that the forebay would not function
according to the original design. Prior to issuance of a building permit, the applicant shall
design and construct a forebay that meets the approval of the DPW. The forebay will
function to allow sediment to settle out and provide an efficient means to conduct routine
maintenance to remove sediment from the basin without having to drain the entire basin.
5. Following the excavation of existing pavement for the construction of Musante Drive, the
contractor must take steps to reduce compaction of the soils in the area of the proposed
Water Quality Swales. The proposed Water Quality Swales must be constructed and
stabilized prior to receiving drainage flows from the roadway and shall be fenced or
otherwise protected during construction of the roadway to prevent heavy equipment from
compacting the underlying soil and prevent sediment washing into the swales.
6. All stormwater systems shall be constructed as proposed and stabilized prior to receiving
drainage flows.
7. Within 60 days of the issuance of this permit, the applicant shall submit a revised
Musante Drive Plan and Profile, Sheet 5.3 specifying a clean out for each perforated pipe
proposed in the Water Quality Swales at the opposite end to the proposed overflow inlets.
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8. The plans show a proposed Drainage Easement on Lot 13-A for proposed Detention
Basin 3. Additional drainage easements may be necessary for the proposed Water Quality
Swales on 38A-087. The Water Quality Swales shall be required to be maintained by the
property owners and must be included in the Stormwater Operation, Maintenance, and
Inspection Agreement as described above. The DPW must review and approve all
proposed Drainage Easements prior to recording at the land records of the Registry of
Deeds.
9. The proposed Stormwater Outfall shown on Drainage Outfall Plan & Profile, Sheet 5.6
specifies 1:1 slopes on the sides of the outfall structure as well as 2:1 slopes above the
proposed headwall. The applicant shall modify the design as much as is feasible to reduce
the pitch of these slopes per approval of the Northampton Conservation Commission and
the DPW.
10. If the design of the proposed Stormwater Outfall changes during the Northampton
Conservation Commission approval of Notice of Intent, the applicant shall submit the
revised design to the DPW for approval as an amendment to this permit.
11. Within 60 days of the issuance of this permit, the applicant shall submit documentation
that all structures in the proposed stormwater collection system have been sized to
adequately collect and convey runoff from the 25-year storm event.
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1 Signature of City Engineer 1 Dates /
t
cc. Planning Board c/o Office of Planning and Development
Building Department
Conservation Commission c/o Office of Planning and Development
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