38A-050 (18) F, LP
STORMNN ATER MANAGEMENT PERMIT -
APPLICATION DECIS `I'V
City of Northampton
Department of Public Works
Project/ Site Name: The Village at Hospital Hill, South Campus �'-
Project Street or Location/Assessor ID: Prince a0d Earle Streets/ 38A - 50
Applicant Name: Hospital Hill Development, LLC c/o MassDevelopment
Applicant Address/Phone:1441 Main St., Springfield, MA 01103 /413-731-8848
Application Submission Date: 12/14/04, Extention-12/3/05
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 plansand information submitted with the application
and as amended by any conditions attached to this permit.
a. The Village at Hospital Hill, South Campus Site Development Plans, Sheets 1-34,
dated 12/09/2004 by Beals and Thomas, Inc.
b. Planning Board Application for Major Project Site Plan Approval for The Village
at Hospital Hill South Campus—Tier I Review, dated 12/10/2004, by Beals and
Thomas, Inc.
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c. "Response to Comments" Letter to Northampton Department of Public Works
from Beals and Thomas, Inc., dated 01/06/2005.
d. "Erosion and Sediment Control Plan," prepared by Beals and Thomas, Inc. dated
01/05/2005.
e. "Erosion and Sediment Control Details and Notes," prepared by Beals and
Thomas, Inc., dated 01/05/2005.
f. "The Village at Hospital Hill Northampton, Massachusetts Operation and
Maintenance Plan"prepared by Beals and Thomas, Inc. January 2005.
g. "Reconfigured Infiltration/Detention Sketch SKC-001,"prepared by Beals and
Thomas, Inc. dated 01/05/2005.
h. Reconfigured Infiltration/Detentioin Sketch SKC-002,"prepared by Beals and
Thomas, Inc. dated 01/05/2005.
i. Design Detail for"Infiltration Outlet Control Weir"
J. Design Detail for"Stormtech SC-740 Chamber System Inlet/Outlet Detail"
k. Design Detail for"Stormtech SC-740 Chamber System Typical Cross Section
Detail"
1. Design Detail for"Stormtech Alternate Inlet/Outlet Configuration"
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 Northampton
DPW to schedule the following inspections: Initial Inspection, Erosion Control
Inspection, Bury Inspection, and Final Inspection. The Northampton DPW may also
conduct random inspections to ensure effective control of erosion and sedimentation
during all phases of construction.
3. Annual Reports documenting the actions completed as required by the Operation,
Maintenance and Inspection Agreement shall be submitted to the Northampton
Department of Public Works by November 1St of each year.
4. 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, graditig, excavation, filling, and installation of
drainage structures on the lots specified 10 this permit.
Specific Permit Conditions:
1. The applicant must submit to the Northampton DPW, within 30 days of the issuance of
this permit, a complete package of revised and updated plans, stormwater management
calculations, and other supporting documentation that includes all changes made since the
applicant's submission of: 1) The Village,at Hospital Hill, South Campus Site
Development Plans, Sheets 1-34, dated 12/09/2004 by Beals and Thomas, Inc. and 2) the
Planning Board Application for Major Project Site Plan Approval for The Village at
Hospital Hill South Campus—Tier I Review, dated 12/10/2004, by Beals and Thomas,
Inc. The Northampton DPW shall confirm to the applicant in writing that all revisions
have been made to the satisfaction of the Northampton DPW.
Other information to be included in the revised documents noted above:
a. The revised Invert Schedule shall include complete and accurate information. The
applicant shall provide missing invert information for DMH-48, DMH-54, DMH-
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55, DMH 56, FE O1, CB 55, CB $6, CB-57. This 1>at may not be complete, and
the applicant shall make every effort to correct the accuracy of the information
submitted.
b. The revised stormwater management calculations shall include a more detailed
analysis of DP-4 which receives drainage flow discharged from Detention Basin 5
and the proposed underground Detention-05, through Wetland Area 3, and flows
either to the municipal drain line on Grove Street (vitreous clay,built 1932) or
crosses Grove Street to a wetland area and drainage ditch next to the railroad
tracks. The Northampton DPW is investigating the route of the pipes offsite and
will forward information to the applicant. Since proposed peak flows to DP-4 are
only a slight reduction from existing peak flows to EDP-4 (and an increase to
peak flows approved by the Definitive Subdivision Plan) and existing flows can
be problematic and have resulted in flooding and icing onto Grove Street, the
applicant shall analyze the capacity of the existing inlet and municipal drain line
to safely convey flows to the municipal system or offsite via another route. The
applicant must also include calculation assumptions for the flow through Wetland
Area 3 that appears to include Addlink 100, OCS-6, and Route 130 in the
drainage routing diagram.
2. During the Tier II Site Plan approval for each lot, the applicant must submit
documentation to the Northampton DPW;of the drainage system and the impervious
surface footprint of the site. If the size of the impervious surface footprint proposed for
the Tier 11 Site Plan Approval is greater than the area specified for the Tier I Site Plan
Approval or if the drainage system is changed in a substantive way, the applicant shall be
required to submit a new application for a Northampton Stormwater Management Permit
for the proposed site plan.
3. The drainage from the proposed 45,000 sq. ft. building on Lot 12A has not been
discussed or included in the drainage calculations. The applicant will be required to
submit a separate application for a Northampton Stormwater Management Permit for this
building.
4. The Letter to the Northampton Department of Public Works from Beals and Thomas, Inc.
dated 01/21/2004 regarding DPW comments on the Phase I Definitive Subdivision Plan
states: "Demolition plans will be submitted during the site plan review process." During
recent meetings the applicant has stated that this information will not be submitted,
therefore the applicant shall be required to notify the Northampton DPW that appropriate
measures have been taken to remove and/or plug all existing drainage systems as they are
encountered during site development.
5. The applicant shall submit a revision of the documents: "Reconfigured
Infiltration/Detention Sketch SKC-001 and SKC-002," prepared by Beals and Thomas,
Inc. dated 01/05/2005, that provides two Clean-Out/ Inspection Ports for each subsurface
infiltration and detention basin—one located adjacent to the inlet and one located
adjacent to the outlet of each basin.
6. The applicant shall submit a signed and completed MA DEP Form 11 –Soil Suitability
Assessment for On-Site Sewage Disposal for each test pit previously conducted to ensure
that a Certified Soil Evaluator has determined the information submitted. The applicant
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shall conduct one additional test pit in the location of the proposed subsurface Detention
Basin 05 to determine ground water elevation and estimated seasonal high groundwater
elevation. A signed and completed DEP Form 11 shall be submitted to the Northampton
DPW to document this test pit.
7. Before the development site is graded, the areas where the proposed subsurface
infiltration basins will be constructed shall be fenced to prevent heavy equipment from
compacting the underlying soil.
S. The applicant must 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 signed by the applicant and approved by the
Northampton DPW. Section 22-85 of the Northampton Stormwater Management
Ordinance provides additional guidance for the requirements of this agreement. The
Northampton DPW will supply a template to the applicant for this agreement.
a. The Operation, Maintenance, and Inspection Agreement shall include
requirements that the applicant provide documentation that the three subsurface
infiltration basins and one subsurface detention basin continue to function as
designed. Regular inspection and maintenance of the infiltration systems shall be
included in the Stormwater Operation, Maintenance, and Inspection Agreement.
In order to inspect the infiltration systems, two observation wells shall be installed
in each basin to determine how quickly the infiltration basins drain after a storm.
The observation wells should be perforated PVC pipe, 4-6"diameter, extending to
the bottom of the bed where they are connected to a foot plate. The observation
wells should be capped and locked to prevent vandalism or tampering. Ponded
water inside the infiltration basin (as visible from the observation well) after 48
hours or several days can indicate that the bottom of the basin is clogged. The
owner is required to repair, replace, or reconstruct the infiltration system if it fails
to operate as designed. A system fails to operate as designed when water is
standing 48 hours or longer following a storm event greater than 1 inch over 24
hours.
9. The Erosion & Sediment Control Plan submitted by the applicant provides a good initial
framework for the entire site construction!. Additional details and adjustments to this plan
shall be provided to the Northampton DPW as individual sites are developed. The
applicant shall provide the following:
a. Each site development 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. Each site will be required to prepare and implement a Stormwater
Pollution Prevention Plan (SWPPP). Copies of both the NOI and SWPPP for each
site shall be submitted to the Northampton DPW prior to issuance of a building
permit. The SWPPP for each site shall be reviewed by the Northampton DPW and
may need to be amended to the satisfaction of the Northampton DPW.
b. The applicant shall remove the proposed use of haybale check dams around
existing and proposed drain inlets'',in the "Erosion Control and Sedimentation
Notes" on Sheet 2-Erosion and Sedimentation Details and Notes and replace with
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the proposed use of siltsacks/filter bags, gravel check dams, or other appropriate
measures to better protect drain inlets.
Signature of City Engineer Date
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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