HomeMy WebLinkAboutComments Miscellaneous 6/11/2008
:
City of Springfield, OR
Memo
To: Steve Hopkins
From: Don Moore
cc:
Date: June 11, 2008
Re: SH R2008-00005
Steve, Here are my comments for the subject Flood Plain Overlay application.
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Preliminary elevation certificate indicates that the site grades adjacent to the existing home are already
between 25 inches and 3!j inches above the Base Flood Elevation for the site. We have to apply flood
zone requirements to the proposed project unless the applicant applies to FEMA for a Letter Of Map
Amendment (LOMA) to essentially exempt this site from the FEMA designated flood plain. It does not
physically remove the site from the FIRM map, but exempts it by a letter of concurrence from FEMA.
The property Owner must apply for a LOMA with appropriate documenta~ion from the surveyor.
Without the LOMA, the replacement manufactured home must comply with the flood hazard
requirements of the Oregon Manufactured Dwelling and Park Specialty Code. In a flood hazard area,
new and replacement manufactured homes must meet the criteria in Section 3 -2.4.1 of that code
(copy attached).
Although manufactured.homes in floodDlains are (apparently) not required to be anchored to
professionally designed foundation support, as they are in floodwavs, I would recommend that tie-
downs be installed, even without an engineered design.
The new manufactured home must provide a crawl space grade at least as high as the lowest adjacent
exterior grade. As an alternative, the home can be pit-set (where .the level of the crawl area is
excavated below the adjacent grade) only when a method for adequate drainage from the crawl space
is approve by the building official. Possibly, a dry well could be designed for that purpose if the Public
Works Department approves.
The floor level of the home must maintain the required 18 inches clearance above the BFE, and a final
elevation certificate must be provided to this office prior to completion and final approval for the project
unless a LOMA is provided and the home is not pit ~et.
Pemnits for the manufactured home placement must be obtained from this office prior to moving the
home onto the site,
Lane County must verify if the existing septic system is suitable to service the new manufactured home.
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