HomeMy WebLinkAboutNotes Internal Reviewers 9/9/2021Memorandum City of Springfield
Date:
To:
From:
Subject:
September 9,2021
Drew Larson, Planner
Clayton McEachern, Civil Engineer
81 l-21-000221-TYPI McCarthy ADU 255 496 pl
I have reviewed the materials provided with the subject application. The recommended
findings and conditions outlined below are provided for your use in preparing the
land-use decision.
SANITARY SEWER
Finding: Section 4.3-105.4 of the SDC requires that sanitary sewers shall be installed to
serve each new development and to connect developments to existing mains.
Additionally, installation of sanitary sewers shall provide sufficient access for
maintenance activities. No information for the sewer connection for the proposed ADU
is submitted.
Finding: The existing lot has a sanitary sewer service main along the northern and
eastern property boundaries and has access to either line as needed.
Condition: For final site plan the applicant will submit a utility plan that shows how
sanitary sewer service and water service will be provided to the proposed ADU, in
compliance with City of Springfield and Springfield Utility Board requirements for
installation and separation of these services.
STORMWATER MANAGEMENT
Finding: Section 4.3-110.B of the SDC requires that the Approval Authority shall grant
development approval only where adequate public andlor private stormwater
management systems provisions have been made as determined by the Public Works
Director, consistent with the Engineering Design Standards and Procedures Manual
(EDSPM).
Finding: Section 4.3-110.C of the SDC states that a stormwater management system shall
accommodate potential run-off from its entire upstream drainage area, whether inside or
outside of the development.
Finding: Section 4.3-l lO.D of the SDC requires that run-off from a development shall be
directed to an approved stormwater management system with sufficient capacity to
accept the discharge.
Finding: Section 4.3-110.E of the SDC requires new developments to employ drainage
management practices, which minimize the amount and rate of surface water run-off into
receiving streams, and which promote water quality.
Finding: NO stormwater calculations or conveyance method is shown for the existing
home or proposed ADU.
Finding: The existing public stormwater system, to which the applicant proposes
connection, has limited capacity. The applicant has not turned in hydrologic stormwater
calculations, consistent with the City's EDSPM, showing that the proposed detention
pond will limit the peak stormwater discharge rates to the pre-developed 2-year storm
event for both the 2 and 25-year post-developed storm event, thereby limiting the flow
into the existing system.
Condition: prior to final site plan approval, the applicant will show that construction of
the ADU will not compromise the existing drainage management from the existing home.
WATER QUALITY
Finding: The only increase in impervious area on the site consists of residential rooftop
only and no treatment is required.
PUBLIC STREETS. SIDEWALKS & IMPROVEMENT AGREEMENTS
Finding: Section 4.2-105.G.2 of the Springfield Development Code requires that
whenever a proposed land division or development will increase traffic on the City street
system and that development has any unimproved street frontage abutting a fully
improved street, that street frontage shall be fully improved to City specifications. The
south 49th Place Cul-De-Sac in front of the existing home is fully improved.
UTILITIES. EASEMENTS AND RIGHTSIF WAY
Finding: The existing lot has a sewer main along the eastern and western property
boundary. Both of these lines have a 7' easement over them into this property. The
proposed location of the ADU is encroaching on both this easements.
Condition: prior to final site plan approval, the applicant will locate the ADU, and all
required stormwater management system other than discharge pipes to the ROW of South
49th place out of these easements. This includes all elements of the building, including
the roofeaves.
Condition: prior to final site plan approval, the applicant will submit a drainage plan for
the ADU showing how stormwater runoff from the proposed ADU will be mitigated on
site if possible, or provide proof that onsite mitigation is not possible (NOTE: typically
this is done with some type of infiltration facility, proof that onsite soils are not suitable
for infiltration is required to show it isn't feasible). This only needs to be shown for the
ADU, not the existing home.
OTHER
NOTE: The intent of this list is to give a developer insight about requirements related to
public improvements before they develop their property.
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 surface area, transportation trip
rates, and plumbing fixture units. Some exceptions apply to Springfield Urban Growth
areas.) [Springfield Code Chapter II, Article l1]
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.
OTHER CITY PERMITS:
Encroachment Permit or Sewer Hookup Permit (working within righrof-way or public
easements) example: new tap to the public storm or sanitary sewer, or adjusting a
manhole. This may be required for sewer service to the ADU.
Land & Drainage Alteration Permits (LDAP). [Contact the Springfield Public Works
D epartmen t @ 7 26 - 5 8 49 for appropriate applications/requirementsl