HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
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S,p-20-20D4 D2:Slpm Frcm-k & A Enflneerlnl. Inc
+541-B84-8S58
T-735 P 002/007 F-952
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.ngln"rlng
K I A Engineering, Inc.
P.O. BOI28624, EGgen.. OR 174O!
521 MIf'bt Il, Suite II. EuIflH. OR 17.
(&41) __ Voice
(141) .... FAX
September 21, 2fJ04
Hayden Homes
2464 5W Glacter Placo, Suite 110
Redmond, OR gn5fl
SUbject Quality assurance. house foundation pad construation
Jasper Meadows SubdMsion - 2nd AddlUon
SprlngfISkJ, Oregon
PmjeI:t: 74.04
PURPOSE AND SCOPE
As 1'8qU98ted. K & A Engineering, Inc, has complel8d mDnltoring the coostrucUon of IndMdual foundation pads
at the SUbJect new residantlalauoolVl8/on. 39 inDIVidual foundation pads WIt$ tgMftUCfBd at the site and
prepared ready for fonnIng new foundaUons.
Prior to construction. a Geotechnlcallnv~gaticn' was made of the subdivision to develop specific
l8Commsndatlons for developIng ttI8 slt810r JlsldentI8I foun,datlons,~, and UtIUtIa8.
The purpose Of our aBJVices was to provide monItOr constructlon of foundation padS to as&tJr8 that c:onatruution
crlt8r1a otJtIIned In the ge0f8c1m1caJ Investigation was addressed. '
1ht8 report documents foundatfon pad construction and makes reaamrnendations for suitability for re$kfentlal
foundation construcIIon.
fOUNDATlON PAD EXCAYAnGN
GIIIBI'II
The foundltion pads developed for this project are to BUpport conventionally framed residential atructul'88
supported by conventional cast-in-place conCl'fltB $pf'&ad footings. Due to 1he slope or 1118 Sb most of the
foundation pads WGI'8 constructed In two or more benohes, B8par1ted In grade by apprmcLo ,(hly 1 to 2-feet.
FountIIUGII SOill
1lIe aeoteclmlcaf lnve8tIQatIon (BoIre) had predicted that high plasticity slits or clays would underlie the site.
excavation for the padS conflrmed 1hat in most of the foundation pads, 1here was 1 to 3-feet of a gray, highly
plutlc, modsrat8ly stiff. and moist silt. In some locations the gray sift contained a slgnlffcant amount of sub-
rounded Ign80uB cobbJe$, 111Is silt was orten covered by 0.&.10 i.D-feet of damp, very lowoodenslty peaty siltS.
Weathered )'tIIlOW-tan tuffaceous siltstone or sandstone was encountGrud underneath the pIastIt silts.
1 BOfte AsaocIatBs. Ine" G~ 'J,41IolJca/ MdpllOll tor lie Jasper MeatJOWJ Seeond AdditiCll. SprtnQfl8Id. Oreaon.
FtbnIary 16, 2003.
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S8P-20-2004 02:31pm From-K & A En,ln88rlnl. Inc
+541-894-8358
T-735 P 0091007 F-9S2
K , A EJlgfneerlng, Inc:.
The gray plastic sIItB and gray plastic ~11te with cobbles were deepest through the westem portion 01 the
subdivision. loiAlw...d zones of gmy plastic silt Dr plastic silt wfth cobbles WlI1 a1SD encountered throughout the
central and eastern portions of the eubdMslon.
faumblliDD hd CoollruclloR
Because the depth and m4ent of solis varied significantly across the 9ubdlv~lQn. .,ach pad was evaluated
IndlYlduallY to determfne the proper depth of excavation and tile amount of select 1In to be placed in the
excavation.
For many of ~ foundatiOn pads, the depth to weathered slRstone or sandstone was less than 2..feet and. In
these casas. the foundation pads were excavated to bedrOCk, and gilded smooth, level, Bnd free from loose
materials, In ~ casas the base or the excavation was in two benches separDd in grade from 1 to 2.feet.
select Granular fill WU placed In the prepared ma:avatIon and brought to footing grade,
In those .,. of deeper aray plastic sUI, the sifts were I'8tTlOY8d to a minimum depth of 1 &-inche8 below footing
grade. Tho battDmB Of th9 excavatlons were graded smoottl, level, and me from loose materials. In most
cases the base of the exoavatIon was In two benches separated In grade tram 1 to 2-fael Select granular no
was placed in tha ~ 8XC8VldIon and brought to footing orade.
In aU cases where peaty slits were encountered, the peaty-slits were completely remavad frOm the foundallon
area.
IGIeot CIrImdar FilII
Select granular fills consisted of a sub-base material and a baSe material. The ~bue . I "I: rial was plaoed on
1M prepaIId subglade in the foundation pads and COMfstDd 01 a S-Inch rn!nuI waU.grBd8d quany ~rogate.
'Tbe bQe material was placed over the StJb-I>aSe rock and con8l8tBd of a 1 *lnph minus densel1raded quany
aggr&gate. Both aggreQ8t.eS were produced at the Morse Bros. Quany In Sprlngfleht
llJ& sub-base thiOIalIII generallY ranaed from 6 to 12-inch88. Base rock ranged from 4 to 12-inches In
1hIokne88. In a few aUlS (Iot8 33 through 39) tf1e sub-bae rock was eliminated and base rock was l.IS8d
exclUalv8ly for1he salect granular fill.
The select granular fiUs WII1 weO comnacted in 12-inch maximum lifts (loose) using 8 ste8i-Wheeled VIbratory
roller. Water was applied 88 necessary to maintain optImUm water content during compaction.
DenIIty cd 811cc1 0rInu1ar filii
SUb-base
The density of the sub-base was evatuatad by InSpection of placcmmt methods and fleld evaluation of water
content The denslly was considered adequate It passes by the large vibratory 8tsekJrum roller did not IBM ,
visible markS In the stlb-base 8gg~ at the edges of 1he drum BJ1d if the 80iI waler content appeared 10 be
near optimum 88 determined In the field.'
2 SqueezIna a smafI amount at lis liner IOQf8O'ld8 in (he hand did not produce siDJlfficantfree water and would I8Il'IaIn In a
relllively unIfonn btJI wtJKJUt imm8dIateIy failing apart.
Project 74.04 Jasper Meadows SUbdivision Phase II, Springfield, OR Page 2 of S
ClI8IJt Hayden Homes september 20, 2004
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S3~OH N30AVH ~d9v:6 9006 '9 'uer