North Common DPW PB CommentsMEMORANDUM
TO: Debin Bruce, Chair, Planning Bo
FR: David K. Veleta, P.E., City Engi eer,
DA: January 9, 2018
RE: File: 0 Olander Drive — 3 -Story Apartment Building — Major Site Plan
Map ID: 31C-017
CC: file
The Department of Public Works has reviewed the above referenced application for the following items:
Traffic: Utilities:
x Volume & Impact on City Street
x Roadway Capacity
x Adequacy of City Road Construction
x Site Distances
x Parking
x Driveway Openings
x Sanitary Sewer
x Water
x Drainage Into City Stormwater System
x Capacity of Stormwater Line
x Northampton Stormwater Permit
NPDES Phase II Compliance
x Other:
The Department of Public Works has the following comments:
No Concerns, project will not have an impact on any items reviewed
Traffic Study is required
Roadway does not have adequate capacity to handle the additional traffic
Roadway is not adequately constructed to handle proposed increase in traffic
Site Distances are not adequate for proposed project
Parking spaces do not meet minimum requirements
Parking spaces are too close to driveway opening
Driveway openings are not adequate for proposed use
Sanitary Sewer line is not adequately sized for proposed use
Sewer line connection is not properly shown
Water line is not adequately sized for proposed use
Water line connection is not properly shown
City stormwater system is not adequate to handle increase in drainage
Stormwater system does not meet minimum requirements for reduction of Total
Suspended Solids (TSS)
x Northampton Stormwater Management Permit has not been approved or conditions for
approved permit have not been met
x Other Comments:
General
• These review comments are based on plans dated December 8, 2017 with revisions on
sheets L.5 and L.6 dated December 26, 2017. The cover page is stamped by Mark
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Darnold, P.E. and Peter Wells, RLA.
Based on the comments below and any conditions required by a Planning permit
approval, the applicant shall submit revised final construction plans, signed and sealed by
a Massachusetts registered P.E. on all applicable plan sheets, to the DPW for review and
approval at least 15 days prior to the issuance of any City building or construction
permits.
If the hearing is continued, the DPW reserves the right to make additional comments to
revised plan submissions.
The application indicates that "an estimate of the daily peak and hour vehicle trips for this
specific project has been provided." This information was not received. Please provide.
Sheet L.2 — Existing Conditions Plan
• The shading of specimen trees does not appear to be complete. Please revise as
appropriate.
• Sheet L.5 (revised 12/26/17) indicates 13 trees that are 20" DBH or greater and 2
potential other trees that are proposed for removal. Please identify which trees are
proposed to be removed.
• This plan sheet should also include any other demolition and erosion control measures
locations and notes that are required for the project.
Sheet L.3 — Site Plan
• Crosswalk markings shall be installed across the terminus of Olander Drive connecting
the existing handicap access ramps. The markings shall be Street Print Duratherm to
match existing crosswalks at Village Hill.
• Several existing significant trees are within close proximity to the proposed building and
construction footprint. The applicant shall confer with the Tree Warden prior to
construction to ensure that these trees will be properly protected for the duration of
construction. If these trees are compromised by construction, additional tree replacements
may be required.
• A Tracking Pad detail is shown on Sheet 1.7, but no location is shown on the plans. Please
indicate the location of the tracking pad, which should be at the private drive project
entrance at the end of Olander Drive.
Sheet LA — Grading and Utilities
• The plan provides a 20 -foot wide drive entrance for a future co -housing project to the
east, but no information on the access grading is provided. The applicant needs to show
how the access drive grading will work with this future project.
• An 8 -inch water line with shutoff valve is proposed just prior to reducing to 6 -inch and
entering the building. It is assumed that fire protection is required for the building, and no
domestic water line is shown. The size and type of domestic service shall be shown on
the plans. It shall branch off the 6 -inch line and be provided with a shutoff valve outside
the building.
• An 8 -inch sewer stub is shown to the east of SMH#11 with a clean out at the property
line. This sewer stub is presumably for the future co -housing project, but no information
is provided on that project. Rather than running this line cross-country, the preferred
location for this future sewer connection would be at the north side of the entrance drive
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to the co -housing project connected to an additional sewer manhole installed on the sewer
main of the current project. The applicant shall provide additional information regarding
the feasibility of the preferred alternative and the basis for the proposed service location.
A drainage easement for an 18 -inch pipe and stormwater treatment chamber is proposed
through the adjacent eastern property to the existing detention basin. The development of
the eastern parcel will likely require a connection to this system upstream of the treatment
chamber. Please indicate where and how the eastern parcel will be connected to this
drainage system or explain why no connection is required.
Re -grading of a walking path along and over the westerly property boundary is proposed.
The proposed grades appear to be at a 2:1 slope. Please indicate and provide details for
erosion protection and armoring for proposed slopes greater than 3:1.
An area along the frontage of Ford Crossing is defined as a proposed separate parcel. It is
our understanding that an ANR subdivision of this area into four building lots may
forthcoming. The applicant should note that there is a gap in the sewer main from the
terminal manhole at the existing curb cut on Ford Crossing (which includes an 8 -inch
sewer stub into the curb cut) and the terminal sewer manhole on Olander Drive.
Development of this parcel as multiple lots will likely require an extension of the sewer
main in Ford Crossing.
Sheets L.6 -L.9 — Details
The Rain Garden detail, 6/L.8, needs further clarification.
o A "6 -inch perforated drain pipe/tie into CB" for the round inlet structure is called
out. Is this correct? The plans indicate solid 12 and 15 -inch HDPE connecting
Inlets #1-3. Please revise the detail and plan as appropriate.
o Specifications for the 24 -inch planting media and mulch shall be provided.
o Test pits to determine the soil characteristics underlying the proposed rain gardens
is required in order to verify their functionality.
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