41-053 Westhampton Road Special Permit PB-Common Driveway-4-25-07~~~, L E
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City of Northampton
Department of Public Works
STORMWATER MANAGEMENT PERMIT
APPLICATION DECISION
Project /Site Name: Walker -Common Driveway
Project Street or Location /Assessor ID: Westhampton Rd. /Map 4"l, Parcels 053, 054 071
Applicant Narne: William R. Walker
Applicant Address/Phone: 1253 Westhampton Road, Florence, MA / 413-586-1241
Owner Name: William R. Walker (Lots 1&2) & Scott Walker (Lot 3)
Owner Address/Phone: 1253 Westhampton Road, Florence, MA / 413-586-1241
Application Submission Date: 3/21/2007
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:
a. Site Plan For Common Driveway, Northampton, MA prepared for William R.
Walker, Sheets 1 & 2 dated 4/3/2007, stamped by Richard P. Weise, P.E.,
Heritage Surveys, Inc.
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b. Drainage Calculations (Common Driveway Project), dated 3/20/2007 and revised
4/10/2007, stamped by Richard P. Weisse, P.E., Heritage Surveys, Inc.
c. Operation and Maintenance Plan, Stormwater System -Swale and Infiltration
Area, Westhampton Road-Route 66, Assessor's Map 41, Parcels 53 & 54,
Northampton, MA, dated March 20, 2007, prepared by Heritage Surveys, Inc.
d. Stormwater Management Permit Application and attached documentation
including Erosion Control and Vegetative Cover Specifications, signed by
William Walker 3/14/2007.
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 phases of construction.
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 fiinction as designed. All changes to the
approved stormwater facilities shall be documented by a professional engineer of record
m 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 1st 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 speci.:fied in this permit.
Specific Permit Conditions:
Prior to issuance of a Building Permit and prior to the start of construction of the
proposed common driveway, 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, signed by the owner, and signed by the Mayor of Northampton.
Section 22-85 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
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the final NOI and Stormwater Pollution Prevention Plan (SWPPP)-shall be submitted to
the Northampton DPW prior to the start of construction.
3. If construction of the proposed common driveway begins prior to the completion or the
reconstructed drainage infrastructure as part of the Route 66 Reconstruction project, the
applicant must submit to the DPW for approval a temporary plan to ensure the safe
discharge of drainage flows to the existing drain inlet and culvert under Westhampton
Road.
4. The bottom of the common drive adjacent to Westhampton Road shall be graded so that
as much runoff as is feasible from the drive will sheet flow off the roadway to the paved
drainage ditch proposed as part of the Route 66 Reconstruction Project.
5. The proposed use of M2.02.0 Rip Rap is inappropriate for use in the proposed swales and
infiltration areas as shown in the details on Plan Sheet 2. Prior to that start of
construction, the applicant shall propose to the DPW for approval a more appropriate rip
rap material.
6. Within 60 days of the issuance of this permit and prior to the start of construction, the
applicant shall submit to the Northampton DPW for approval revised site plans showing
the following:
- a. The detail-for the proposed impervious barrier within the check-dams (Sheet 2)
shall berevised to show the impervious barrier extending from 2 inches below the
top of the check dam to 6 inches below the 12-inch gravel base of the drainage
swale.
b. The details for the proposed 2' Wide Stone Lined Drainage Swale and the Rip-
Rap Infiltration Area (Sheet 2) shall be revised to specify that the 12" Compacted
Gravel Base be lightly compacted or not compacted at all to avoid compaction of
the underlying soils and promote better infiltration of the systems.
c. The proposed 6" overflow pipe from the Infiltration Basin at the bottom of the
common drive shall be revised to a 4' diameter catch basin to be used as an outlet
control structure with a 6-inch orifice at elevation 362.5 and a rim at elevation
362.9 with an outlet pipe sized to safely convey the peak flow of the 100 year
design storm down to the drainage system on Westhampton Road.
7. The Site Plan (Sheet 1) specifies the area that will be cleared (Proposed Limits of
Disturbance/Lawn) and the proposed layout of driveways and houses for Lots 1,2 & 3.
Any expansion of the cleared area beyond the Proposed Limits of Disturbance/Lawn or
increase in the driveway, house, or any impervious surlace areas as specified on the Plans
shall require. an amendment to the Stormwater Management Permit approved by the
Northampton DPW.
8. All stormwater systems shall be installed as proposed and stabilized prior to receiving
drainage flows and within 4 months of the installation of the common drive or start of
building construction.
9. Prior to issuance of any certificate of occupancy, the common driveway shall be
constructed as proposed and conditioned by this permit, and all land adjacent to the
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common driveway shall be stabilized and vegetation established. Disturbed areas of each
lot outside the common driveway will be stabilized and vegetated within four (4) months
of a final certificate of occupancy for said lot.
10. A DPW Driveway Permit is required for this project and as a requirement of this permit,
if the driveway grade is greater than 3%, the first 100 feet of the driveway must be paved.
The DPW has reviewed this change and does not believe that it would significantly alter
the drainage calculation. The proposed common driveway beyond the first 100 feet must
be gravel as specified in the plan. If at some point in the future the common drive is
paved beyond the first 100 feet, a new Stormwater Management Permit must be applied
for and approved by the DPW.
9~ /~ D'
Signature of City Eng eer ate
cc: Planning-Board c/o Office of Planning and IDevelopmeiit""
Building Department
Conservation Commission c/o Office of Planning and Development
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