HomeMy WebLinkAboutPermit Field Test & Inspection Report 2001-12-19
09:41
'C503 388 6480
PW SI:lU.t's
12/19/01
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FO:~D ~,_\lESS III FASSBE\l):~, I\lC.
lAND SURVEYING. CONSTRUCTION SUPERVISION. WATER ~IGHTS EXAMINATIONS
CIVil ENGINEERING. GEOTECHNICAL. ENVIRONMENTAL
December 19, 2001
. , .
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Mr. Ed Lannoye
c/o Grassroots Development
Joy of Bookkeeping
P,O, Box 195 ,
Springfield, Oregon 974n
RE: Subgrade EVIlluatfon and Compaction Assessment
levi Landing - lot 75
Springfield. Oregon
'On December 18,2001, a F9pfesentstive fl..m Ford-Ness-Fassbender, Inc. observed and hand-
probed the building pad subgrade on the above referenced residential building lot to assess the
subgrsde bearing capacity and shrlnk/swetl potential of the soi', and evaluated the compactj~
of the overlying aggregate cover.
II
Lot 7& - Pennlt No.
The building pad had been over-excaV8ted to remove surface vegetation and to elCpOSe a
clayey silt/silty clay subgr8de soil, The soil subgrade had a moderate shrink/swell POtential and
Is suitable for an allowable bearing capacity up to 1,500 pst. The subgrade has been covered
with approximately 5,5-inches of compacted crushed aggregate to protect the subgrade during
wet weather construction and stabilize the soli moisture content to mitigate the POtential for soil
shrink/swell,
The approximately 5,5-inch thick layer of %--0 crushed aggregate from Springfield Quarry is wet
from recent heavy rains and the sou1hwest comer has standing water. Based on digging
through the aggregate and acceSSing a simple weight to volum~ relation, the aggregate was
detennined to be compacted to at least 95% of its 133,5 pcf maximum dry density provided by
Springfield Quarry and based on AASHTO Method T-99, The subgrade and compacted flll on
this lot is suitable for conventionall8sidential construction We recommend that peri, ~.I' ~!~::.,r
footings be reinforced with at least two No, 4 steel reinforcing bars,
We I9COmmend that heavy equipment, such 85 concrete trucks, dump.tnJcks and ILlmber
delivery trucks not be allowed on the building pad area due to the wet conditions. Sfanaing
water should be made to drain of the pad al8a and future landscape soil shall slope to direct
surface water away from all foundations, and water should not POnd adja ~ ~"..Ii to footings,