HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
\1)1 S O;('1icL Jl
S,p-2D-20D4 a2:91pm Frcm-K & A Eniineerlni, Ine
+541-884-8358
T-795 P 002/007 F-952
a
'nglnPlrlng
J( I A Engineering, Inc.
, P.O. Bu28624, Elgene. OR 87a
521 MarbI Il, Suite B. Eugene. OR 17.
(&41) I84-8S8I Voice
(141) 1184-_ FAX
September 21( 2004
Hayden Homes
2464 5W Glacier PlaCo, SUIte 110
Redmond, OR gn58
Subject: Quality assurance. house foundaUon pad tonstruation
Jasper Meadows Subdivision - ~ AddlUon
Sprtngfl8ICI, Oregon
Project: '14.04
PURPOSE AND SCOPE
As 1'8QU98t8d, K & A Engineer1ng. Inc, has complet8cl monftDrtng the coostructlon Of IndMdual foundation pads
at the SUbJect new residentlal.UbC!IVI8Ion. 39 incflVidL181 foundation pads we,. construc:t8d at the site and
prepal'8d ready for 10nnIng new foundaUons.
Prior to construction, a Geotechnlcallnvmtgation' was made or the subdivision to develop speclftc
r&commsndatfons for developlng 1118 Bite lor IBSkltntlal tounpatlonSr~, and UUlItles.
The purpose Of our allVices was to provide monitor corlStrucUon at foundation paas to assure 1hat COMtruation
criteria outlined In the goof8chn1caJ Investigation WI! addre8aed. .
ThIs report documents foundation pad construction and makes recommendatiOns far suitability for residential
foundation constructIOn.
fOUNDAllON PAD EXCAVAnON
GIIIII'IJ
The faundltion pads d6veIoped for this project Bnl to support conventionally framed residllntial atructul88
supportdd by conventional cast-ln-place conCI'GtB sprBad footings. Due to the slope or 1118 SItS most of 1Il8
foundation pads were con&tructed In two or mof1 benahes. 88parated In grade by appraxL. l(~dy 1 to 2-feet.
FoundIdoII hill
11Ie aeotechnJcallnv88tklatlon (BoIre) had predicted that high plasticity sills or clays would underlie the site.
Excavatlon for 1tI8 padS confirmed that in most of the foundation pads, there was 1 to 3-feet of a gray. highly
plude, modll_ atIff. and moist sill In some locations the gray siR contained a sJgnlftcant amolmt of sub-
rounded Ign8oU8 cob*, 111Is silt was ensn covered by 0.&.10 i.D-feet of damp, very Iow..(tenslty peaty siltS.
Weathered ,VIIBow-1an tuffaceous siltstone or sandstone was encounl8red ul1demeath the plastic sills.
\ Boire ~s. Ine,. G8OI8ChnlcallnY8slgallon for lie Jasper Meadows Seeond Addition, Sprtngfteld. Oraoon.
ftbruary 16, 2003.
8 'd l8L9'oN
S3~OH N30AVH ~dH:l 900l 'g 'UBr
$1P-ZO-2004 02:31pm From-K & A En,lneerlnl, Ine
+S4HB4-Q35S
T-735 P 009/007 F-952
K & A Enafneerfng, Inc:.
The gray pfastic slits and gray plastic "ite with oobblts were ~pest through rile westem portion 011fl8
subdivision. IsoIat8d zones of gray plastic sltt or plastic sift with cobbles WfIrt also encountel'8d throughout the
central and eastern portions ar the eubdMslon.
fa....1iDa hd GOIIatruclloR
Because the depth and 148nt of soDs varJed significantly across the 8ubdlv~n, .,aoh pad was evaluated
IndMdually to determine the proper depth of excavation and the amount 01 &elect fin to be placed in the
m<caVatIon.
For many of 1110 foundation pad8. the depth to weathered slRstone or sandstone was less than .2.feet and, In
IIlese cases, the foundation pads were excavated to belllOCk, and graded smooth, JeveI, and free from loose
materials. In ~ cases 1h8 base of the excavation was in two benches separated m grade from 1 to 2.feet.
Select aranular fill \VIS placed In the prepared excavation and brought to footing grade.
In those .. of deeper araY plastic sUI, the sifts were removed to a minimum depth of 1 &-inch08 billow fooUng
grade. The battolt1$ of the excavations ~ grBded smootft, fevel, and tree frum loose materials. In most
cases the base of the excavation W89 In two bem;has separated In grade from 1 to 2-fael Select granular fin
was placed in the pt&parQd 8XCavatIon and brooghUD footing grade.
In aU Ci$e$ Well peaty slItS were encountered, the peaty-sIlts were completely remavtd fn:tm the foundation
area.
S8IeIt 8rImdar FilII
Select granular fills consisted of a sub-base material and a baSe material. The SCJb.obue I !~~ lriaf was plaoed on
1M pr8P8f1d subgrade in the foundation pads and consIat8d or 8 S-Inch minus waU.grad8d quany aooraoatB.
'Ibe bQe material was placed over the stJb.i>ase rock and con8l8t8d of a 11klnfh minus dense-oraded quany
aggr&gat9. Both aggr&Q8te8 Wire produced at the Morse Bros. Quany In SprlngtJeld.
ll1A aub-basG ttioknesI generally ranged tram 6 to 12-inches. Base rock ranged from 4 to 12-i1ches In
1hIC1cnNa. In a fvw aues (Jots 33 through 39) ttJe sub-bue rock was eliminated and base I'Otk was used
excluS!V8Iy forthe u/8ct grwtufar fill.
The select granular fiUs W8\'I weD compacted in 12-inch maximum lifts (loose) using a Bt8eI-whe8led Vibratory
roller. Water was applied IS necessary to maintain opllmum water content during compaction.
Denllty or 8c1cct Innmlar filla
SUb-base
The density of the sub-baSe was evaluated by InSpection of placement melflods and fleld evaluation of water
content The denslly was considered adaquate It passes by the large vibratory stseI-drum roller did not Iuve
Visible markS In the sub-base aggregm lit the edges of the drum Bnd if the 80iI water content appeared 10 be
near optimum as d8tennJned In the field. e
2 SqUH2lng a small amount or 118 liner aaareaall in the hand did not produce sillJlifieant free wat8r and would f8Il'IaIn In a
rellliYely uniform ball wtfKJut immaclatlly faOlng apart.
Project 74.04 Jasper Meadows Subdivision Phase II, Springfield, OR Page 2 of 3
Client Hayden Homes september 20, 2004
t 'd lU9'oN
S3~OH N30AVH ~d9t:l gOal 'g 'uer