HomeMy WebLinkAboutComments PWE 4/1/2009
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Memorandum
City of Springfield
Date: April I, 2009
To: . Lissa Davis; Urban Planner
From: Eric Walter, Civil Engineer
Subject: DRC2009-00010, Copeland MDS
I have reviewed the materials provided with the subject application. The recommended
[mdings and conditions outlined below are provided for your use in processing permit.
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WATEROUALITY
Finding: Section 3.03.3.B of the city's EDSPM states all public and private development.
and redevelopment projects shall employ a system of one or more post-developed BMPs
that in combination are 'designed to achieve at least a 70 percent reduction:in the total
suspended solids in the runoff generated by that development. Section 3.03.4.E of the
manual requires a minimum of 50 percent of the. non-building rooftop imp'ervious area on
a site shall be treated for stormwater quality improvement using vegetative methods.
Finding: To meet the requirements of the City's MS4 permit, the Springfield
Development Code, and the City's EDSPM, the applicant has proposed a private
vegetative water quality swale at north end of property to treat the runoff, from the new
pavement area. The bioswale is being proposed to drain to a inlet at the north least corner
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of property, then piped to the 39 Street curb and gutter system.
Finding: The vegetation proposed for use in the swales will serve as the primary pollutant
removal mechanism for the stormwater runoff, .and will remove suspended solids and .
pollutants through the processes of sedimentation and filtration. Satisfactory pollutant
removal will occur only when the vegetation has been fully established.
Finding: A swale detail was provided; however the detailed drawing and all pertinent
detailed information does not show conformance with the City of Springfield
Engineering Design Standards and Portland Standards. The swale detail does not include
geometry (side slopes, bottom width, longitudinal slope, etc.) as wel( as .vegetative and
seed mix. requirements.
Condition: Prior to City approval, the applicant shall submit a complete water quality
bioswale detail showing'conformance with code. Detail shall include swale:geometry as ,
well as proposed seed mix for the private vegetative water quality swale. TIie seed mix
shall meet the requirements of the City's interim design standards as require~ in Section
3.02 of the EDSPM. The City of Portland stormwater management manual'!llay be
referenced for design. .
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Condition: To ensure a fully functioning water quality system and meet objectives of
Springfield's MS4 permit, the Springfield Development Code and the EDSPM, the
proposed private vegetative water quality swaleshall be fully vegetated with all
vegetation species established prior to City approval. Alternatively, if this condition
cannot be met, the applicant shall provide and maintain additional interim erosion
control/water quality measures acceptable to the Public Works Department that will
suffice until such time as the swale vegetation becomes fully established.
PUBLIC STREETS. SIDEWALKS & IMPROVEMENT AGREEMENTS
Findil1g: Applicant is not proposing street improvements and are not requireq as part of
this application. '
UTILITIES. EASEMENTS AND RIGHTS OF WAY'
Finding: Proposed pavement addition does not appear to require new easements or effect
existing'easements and/or right-of-way.
FEES AND PERMITS
SYSTEMS DEVELOPMENT CHARGE: '
Pay applicable Systems Development Charges when building permits are issued for
developments within the City limits or within the Springfield Urban Growth Boundary.
(The cost relates to the amount of increase 'in impervious surfac~ area, transportation trip
rates, and plumbing fixture units, Some exceptions apply to Springfield Urban Growth
areas.) [Springfield Code Chapter II, Article 11]
Systems Development Charges (SDC's) will apply to the construction of buildings and
site improvements within the subject site. The Charges will be based upon the rates in
effect at the time of permit submittal for buildings or site improvements on each portion
or phase of the development:
PUBLIC INFRASTRUCTURE FEES:
It is the responsibility of the private developer to fund the public infrastructure.
OTHER CITY PERMITS:
Encroachment Permit or Sewer Hookup Permit (working within right-of-way or public
easements) example: new tap to the public storm or sanitary sewer, or adjusting a
manhole. [The current rate is $139.50 for processing plus applicable fees and deposits]
Land & Drainage Alteration Permits (LDAP)." [Contact the Springfield Public Works
Department @ 726-5849 for appropriate applications/requirements]
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