HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
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$1P-20-2004 D2:91pm From-K & A Enlineerln., Ine
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+541-B84-9358
T-7!5 P DD2/00T F-952
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K I A Engineering, Inc.
P,O. Bal28624, E....... OR 17402
521 MarIref IL, Baile B. Eugene. OR 174G2
(141) ..... Voice
(141 J 1B4-8a&8 fAX
leptember 21, 2G04
Hayden Homes
2464 SW Glacier Placa. Suite 110
Redmond, OR gn58
Subject: Quality assurance. house foundallon pad construotion
Jasper Meadows SubdMsion - ~ Addition
Springfield, Oregon
Project: 74.04
PURPOSE AND SCOPE
As reqU88t8d. K & A Engineering, Inc. has completed mDnItorIng the construction of Individual foundation pads
at the subject new residentlBl'UbC!MSIon. 39 indMdual foundation pads were canstrucl8d at the site and
prepared ready tor forming naw foundaUOf1$.
PrIOr to construction. a Geotechnlcallnve~gatiDn1 was made or the subdivision to develop specific
fBCommrmdatlons for developing ttIe site for rllldent181 foun,datlons,~. and UUIltI8s.
Tlle purpose of our 'BJVices was to provide monItOr construction of foundation padS to assure 1hat construatian
cl1t8rla outlined In the geotachnlcaJ Investigation was addreSaed, .
11118 report documents foundation pad constructiOn and makes recommendations tar suitability for resldentfsl
foundation construcIIon,
fOUNDAllON PAD EXCAVAnoN
Gllln
The foundation pads developed for this project are to IiUpport conventionally framed r8Sicblntial81ructur88
tuppotbld by conventlonal cast-ln-pl8Ce cancl'GtD spread faolings. Due to the slope or tf18 SIt8 most of tile
foundation pAds were constructed In two or more benches, B8par1ted In grade by approxi I, ,I(~ dy 1 to 2.feel
FoundedGII hile
1l1e aeotechnlcaf lnv88tIgaUon (Boh) had predicted that hIgh Plasticity slits or clays would unde~1e the site.
excavation for the paLl8 confirmed that in most of the foundation pads, there was 1 to 3-feet of a gray, highly
plutic, modllratlly attrf. and moist silt. In some locations the gray sift contaIJ1ed a significant amount of sub-
rounded igneous cobbles. This silt was eftsn covered by O.&.to 1.().feet of damp, very low--d8ns1ty peaty siltS.
Weathered YBIloW-tan tuffaceous siltstOne or sandstone was encountenld underneath the plastic sills.
1 BOfre AsiOcIatBs, Ine" G",~:,~"," lnvedgaIJon for IJe Jasper Meadows hcond Additicrl, Springfield, Oreoon.
ftbruary 16, 2003,
8 'd UL9'oN
S3~OH N30AVH ~dH:Z 900Z '9 'uer
$ep-20-2004 02:31pm From-K & A EnllnBerinl, Inc
+5~1-GB4-m8
T-T35 P 009/007 F-9S2
K & A Engineering, Inc.
The gray plas& slits and gray plastic tlllte w~h oobblGs were deepest through the western portion of the
subdivision. IsoIat8d zones of amy plastic sltt or plastic sin with cobbles WfllI also encountered throughout 1f1e
central and easrem porllons of the eubdMsIon.
FalDldltiDII hd GonllrUctIoR
Because 1he depth and IXtent of soDs varied significantly across the Bubdlv~lon, ~ch pad was evaluated
IndMdually to determine the proper delrth of excavation and tlle amount 01 &elect fin to be placed in the
mccavatIon.
for many (If th~ fDUfldation pacl8. the depth to weatheRld slRstone or sandstone was less than 2.feet and, In
theso cases. the foundation pads were excavated to balltOCk, and gradid smooth, level, and free from lOose
materfals. In ~ casas the base or the excavation was in two benches separated in grade from 1 to ~.feet
StJect aranular fill wu placed In 1he prepared mccavation and brought 10 footing grada.
In those area of deeper gray plastic sUI, the sifts wars removed to a minimum depth of 1 &-inche8 below fooUno
grade. The batlDlTl$ of th9 excavations were gJBded smootfl, level, and free from loose mat8~8ls. In moat
cases the base of 1he eavatfon was In two benches ssparatBd In arade from 1 to 2-f8et. SeIact granular fin
was placed in the pttIpaI'Qd 8XCavatIon and bl'O\l{Jht to footing grade.
,
In aU cases where peaty slits were encountered, the peaty-silts were completely remavad frOm the foundation
I
area.
s.... Grlmdar Fills
Select granular fills consisted of a sub-base mater1aJ and a DaSe material. The SlJb..bue mablliaI was placed on
1he prepared subgrade in the foundation pads and con9IstDd of a S-1nch mInUs weU.grad8d quatty QQOraQata.
The bQe matertal was placed over the stJb-t>ase rack am:! consl8tBd at a 1 *'Inch minus denae.graded quarry
aggfIg8tB. Both aggmoates were produced at the Morse Bros. Quarry In Sprlnghe!d.
lll& SlJb..bas8 thiokneSI generally ranged fiom'6 to 12-;nche8. Base rock ranged from 4 to 12-1nches In
1hIckn888, In I fvw aU88 (Jot8 33 through 39) tf1e sub-ba8e rock was elimInated and base rock was used
excluslv8fy for1he uIect granular fill.
The select granular fills wtl1 well compacted in 12-inch maximum lifts (loose) using a st8el-Wheeled vlbratory
roller. Water was applied 88 rtecasary to maintain optImUm water contant during compaction.
DenIIty of Select Bnmular filla
SUb-base
The denstty of the sub-base was evaIUatsd by InSpection of placement methods and field evaluaUon of water
content. The denslly was considered adequate If passes by the large vibratory 8tsel-drum roller did not I8ave
VisIble markS In the sub-base agg~ at the edges of the drum BJ1d if the soil water content appeared to be
near optimum as determined In the field. a
"
2 Squeezing a small amount of lie liner IOIJl1UIdB in the hand did oot produce siDRibnt free water and would rII1'I8In In a
rellliYely uniform ~ witIaut in1mtdIa&ely failing apart. ,
PrOject 74.04 Jasper Meadows Subdivision Phase II, Springfield, OR Page 2 of S
Client Hayden Homes september 20; 2004
t 'd l8LS'oN
S3~OH N30AVH ~d9t:l 900l 'g 'uer