HomeMy WebLinkAboutPermit Field Test & Inspection Report 2002-5-14
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FORD," ~ESS ~FASS 3E~-=>E {, I \Ie.
LAND SURVEYING. CONSTRUCTION SUPERVISION. WATER RIC...TS EXAMINATIONS
CIVIL ENGINEERING. GEOTECHNICAL. ENVIRONMENTAL
May 14. 2002
Cathy & Patrick Gilman
cloGrassroots Development
1135 CaI Young Road
Eugene, Oregon 97401
RE:
Subgrade Evaluation
Gilman Residence - 572 So. 67th
Lot 3 - East Hay.n Subdivision
springfield, Oregon
On May 9, 2002 a geotechnical engineer from Ford-Ness-Fassbender, Inc. observed and hand-
probed the abOVe referenced I'88ldentlal building lot to B&SeSS the subgrade for foundation
bearing capacity and shrink/eweD potential of the soil.
Lot 3 - Eut Haven Subdivision
There are no apparent geologic hazards on the building lot. The buildIng lot is overlain by dark
brown 1i1ty clay with abundant organics near the surface, Fill 18 located within the f1ret 20 feet
off the curbJlne of 61th, however the fill is not expected to affect the building pad area. Any cuts
in this 'HI for access should be laid back to at least a 2:1 slope (horizontal'vertical) end protected
from erosion.
We recommend that the building lot be overexC8vsled 16- to 24-inches to remove the soft
organic 6011 near the surface. A sman drainage runs north and south through the center of the
lot. Some trees have been removed from the building site end all roots should be grubbed out
and dISturbed soil recompacted or removed and backfilled With granular material. The subgrade
eoII that will be exposed is moderately ex,... ...ive and has an aIJowabIe beal1ng ~padty up to
1.500 psf. Near surface seepage ta anticipated at the site, a footing drain consisting of 3-inch
diameter perfolilted pipe encased in 1 cubic foot per foot of drain rock wrapped with filter fabric,
or a suitable molded footing drain. should be Installed adjacent to all up slope footings.
Subgrade soilS Will soften with ';0' '.. ...5ure to rainfall; the foundation ehoul4 be poured within 3 to
5 d$y& after c.........Jng the subgrade or be protected with 2. to 4-inches of compacted crushed
aggregate. Timely pouring of the foundations or covering with aggregete wlll mitigate the
shrink/swell potential of the 8011 by minimizing soil moisture fluctuations. No heavy eQuipment
should be allowed on the building pad after eubgrade exposure.
Sincerely,
Ford-Hess-Fassbender Inc.