HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
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$1P-20-20D4 ~2:9Ipm Frcm-K & A En.ineerln(. Ine
+541-884-USB
I T-735 P 002/007 F-952
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K I A Engineering, Inc.
P.O. 80128624, Elgen.. OR 87402
521 Mertcef St., Suite B, !ugeDe, OR 17402
(&41) &14-" Voice
(141) 184-" FAX
September 21, 2004
Hayden Homes
2464 SW Glacier PIaQIl, Sutte 110
Redmond, OR gn5S
Subject: Quality assurance - house foundation pad tonstruotion
Jasper Meadows SubdMsion - 2nd Addition
Sprlngfl8lCl, Orvgon
Project: 74.04
PURPOSE AND SCOPE
As 1'8QU98t8d, K & A Engineering. Inc, haS complet8tl mOnftor1ng the construction of Individual foundation pads .
at the subject new residantlalsUbdMlIon. 39 indMdual foundation pads were constructad at the site and
prepal'8d ready for fmmlng new foundaUon$.
Poor to construction. a Geotechnlcallnve3tlgation1 was made of the subdivision to develop specific
f8Commsndatlons for developlng UI8 slt810r rlsIdentIaJ toun,dations,~. and UUUtIas.
The purpose Of our IIIVices was to provide monItOr construction of foundation padS to as&tn'8 that c:orwtruution
cl1t8rla outlined In the ge0t8ctm1caJ Investigation was addreSSed. .
11lIs repor1 documents foundatlon pad construction and makes' reoornmendations for sullablllty for resldentl!l
foundation Cw'u.'JL Jdlon.
FOUNDAllON PAD EXCAVAnoN
GIIIII'II
~ foundation pads d6veIoped for this project are to support conventionally framed residential alnJctu1'88
supported by conwntlonal cast-ln-pl8Ce conCRlte spr&ad footings. Due to 1he slope Df 1118 Sft most or till
foundation pads we" constructed In two or more benohas, separated In grade by approximately 1 to 2-f8et.
FoundIdoa SOill
1l1e Geotechnical lnVeetIgaUon (Boh) had predicted that high Plasticity lilts or clays would underlie the site.
Excavatlon for 1tI8 plaa conflnned that in most of the foundation pads, 1here was 1 to 3-feet of a gray. highly
plastic, modllrately stiff. and moist sill In some locations the gray sI~ contained a slgnlftcant amount of sub-
rounded Ign80uI cobble$. 111Is silt was artsn covered by 0.6-10 to-feet of damp, very 1ow..(feJ1s1ty peaty siltS.
Weathered ydow-tan tuffaceous siltstone or sandstone was encounterud underneath the plastic sills.
1 BOIre AMocIaI8s, Ine,. G8OleChnfcallllvestlgatJDl1 for fie Jasper Meadows Geeond Addiffan, SprfnQrleId, OIlGOll,
February 1 ~ 2003.
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$ep-20-2004 02:31pm Frum-K & A Enllneerlnl. Inc
+541-6B4-9358
T-T35 P 009/007 F-9S2
K & A Enatneerlng, Inc.
The gray plasK slits and gray plastic -a1lt8 w~h cobbles were deepest through the western portion 011he
subdivision. Isolated lDne8 of gray plastic sltt or prastic silt with cobbles WBF8 also encountered throughout tile
central and eastern portions at the eubdMslon,
FalDldlliDll ..... COdatructloR
Because the c1epth and extent Of soils vaned Significantly across the 8ubdlv"lon, .ch pad was 8'la/uated
IndlYlduallY to detlrmlna the proper depth of excavation and the amount 01 &elect 1In to be placed in the
excavation.
For marw of ~ foundatiOn pacl8. the depUl to weathered slRstone or sandstone was less than 2..feet and, In
ltIeso casas, the foundatiOn pads wers excavated to bedrOCk, and gl1d8d smooth, level. and frBe from /008&
materfals. In ~ cases the base or the excavation was in tWo benches separated in grade from 1 to j!.f8et
Select granular fill wu placed In the prepared excavation and brought 10 footlng grade,
In those areas of deeper 0l'8Y Plastic sIl, the sifts ware removed to a minimum depth of 1 &-inch88 belOw fooUno
grade. The bottolTB of the excavations were grBded smootl'l, level, and free from loose mate~als. In most
eases 1he base of the exaavatlon was In two benahes separated In grade from 1 to 2-f8Bt. Select granular no
was placed in the pttIpal'Qd axcavatlon and brooght 10 footing grade.
In aU case$ where peaty sDtl were encountered, the peaty-silts were completely removQd fmm the foundation
area.
SlIGer CII1md8r FilII
Select granular fills consisted Of a sub-base mater1aJ ami a baSe material. The SlJb..buu mablriaf was placed on
1h8 prepared subgrade in the foundation pads and con9l8tBd or a S-Inch mInUS weU-arad8d quany aoorGgata.
The bQe materlaf was placed over the sub-l>ase rock and COnsf8tBd of a 1 ~J1fh minus dense1Jraded quarry
aggnagate. Both aggregates were produced at the MOl1e Bros. Quany In SprlngtleId.
llJa aub-bas8 thiOJaIus generally ranged from 6 to 12-jnches, Base rock ranged from 4 to 120inches In
1hIckneaa. In a fvw Goes (Iot8 33 through 39) the sub-bue rock was elimInated and base rock was used
exclUsively for the ssIect granUlar flU.
The select Granular fins were wen comJ)&cted in 12-inch maximum lifts (loose) using a steel-wheeled vibratory
roller. Water was applied 88 ntC88Sary to maintain optImUm water content during compaction.
Denllly or 8c1cclOnnm. filla
SlJb.base
'Ole denstty of the sut>-base was evaluated by InSpection at placement methods and fleld evaluatton of water
content. The density was considered adequate If passes by'the large vibratory 8tsel-drum roller did not I8ave
VIsIble marIeS In the StJb-base aggmgm at the edges of the drum and if the 80iI water cont8nt appeared to be
near optimum as determined In the field. a
2 Squeezing a small amount of lie _ aaareaa18 in the hand did not produce significant free wBt8r and would r8I1'IaIn In a
rellliYely unrrorm ~ wttmut in1mecIateIy failing apart.
Project 74.04 Jasper Meadows Subdivision PhaSe II, Sprtflgfield, OR Page 2 of 3
ClIeIIt Hayden Homes september 201 2004
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