HomeMy WebLinkAboutPermit Building 1999-5-27
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BRAUNSM
INTERTEC,
A Division oft.... ~., Infonnation
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Engineering. Consulting. Testing
PSI has acquired the Oreg,on assets of Braun Intertec, Inc,
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Project No. 704-95124
Report No. 2598-059-001
May 27, 1999
Mr. M~les Breadner
Breadner, Parker & Associates, LLC
2046 N. W. Marshall, Street
Portland, Oregon ,97209
Dear Mr. Breadner:
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I · SpecifiC APPRoVAL.. 5Y A ~CE:N5e:o
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Re:, Geotechnical Cons,ultation Services, Ambleside Subdivision Phase II, Springfield, Oregon,
" We confirtn our site visit of M~y 25, 1999, to me~t with Mr. Glen: Ling arid to review the site
conditions for the Ambleside Subdivision Phase II'project. Emphasis of our observations was placed
on Lots 8' and 58.
At the time of our site visit of May 25, 1999, the concrete foundation for Lot 8 was being placed. A
crushed rock base, had been placed throughout the pad area. The excavated soil had been placed just
outside of the pad area.' The soils on these lots are clay soils and should be prevented from drying out
',prior to placement of footings, sidewalks, concrete slabs, and other supported features. This appeared
to be the proced~i:e being use,d by the building contractors. the placement of a crushed rock wearing
surface,3 t06 inches in depth over the building paq will prevent construction traffic from disturbing
the upper sensitive clay soils during wet weather and also help prevent the clay soils from significantly
, changing moisture content during the drier months.
After visiting the project site, we met with Mr. Donald Moore, the conStruction representative for the
City of Springfield Development Services Department, ~egarding the re~uirements of a site spe~ific
geotechnical study being conducted for each lot. The geotechnical ,conditions throughout the
Ambleside Subdivision Phase II project can be considered similar as long as the building contractors
'are using similar COIl$truction procedures (including excavating to below, the surface d'ried out day soil
estimated to be 4 to 6 inches thick),and immediately placing a crushed rock wearing surface blankek--
on the : firm clay soils. In our opinion, if this procedure is followed, a site specific geotechnical stuay
for each lot. will not be necessary. However, we do suggest that if the building inspector observes any
unusual or questionable site conditions, we should be contacted.
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The placement of structural fills to bring any lot to a higher' building elevation must be monitored to
confirm the adequate compacti'on of the fill. We also recommend that all crawl space or subsurface
areas be provided with a lowpoint drain. The perimeter foundation drain should be placed below the
perimeter footing in the crushed rock wearing surface pad to prevent the infiltration of storm water
Professional Service Industries,lnc,. 6032 North Cutter Circle, Suite 480' Portland, OR 97217. Phone,503/289-1778' Fax 503/289-1918
. Breadner Parker & Assoc.
Project No. 704-95124 :'
Report No. 2598-059-001
May 27, 1999
Page 2
under the foundation and into the crawl space area. The upper native soils can be used for 1 to 2 feet
of fill placed over the foundation backfill, thus prov~ding a seal to the backfill. The final grade should
slope away (downgrade) from the foundation. All drains should be connected to the storm drain
system but in no case to the downspout roof drains unless a backflow valve is provided.
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Please refer to the Geotechnical Evaluation ReportS (Project No. EBXX-98-0208) issued by Braun
Intertec Corporation dated April 25, 1999, prepared for the City of Springfield Department of Public
works regarding the previously placed structural fill on a number of the lots in Phase II.
Numerous surface piles of previously excavated loose material had been placed on the .surface of the
lots throughout Phase II of the project. This will require removal or structural compaction of the fill
materials prior to the pla~ement of any buildmg features' requiring support.
General
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Services performed by the geotechnical and materials engineer for this project have been conducted
with that level of care and skill ordinarily exercised by members of the profession currently practicing
in this area under similar budget and time restraints. 1'l'0 warranty, expressed or implied, is made.
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We appreciate the opportunity to be of service at this time. Should you have any questions regarding
the above or require further assistance, please do not hesitate to contact me at (503) 978-4703 or (800)
783-6985.
Charles R. Lane, PE
Senior Enginee~
,Sincerely., .,
crl:pas
c: Mr. 'Donald Moore, City of Springfield
Mr. Glen Ling
PSI, Inc. - Springfield Office
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