HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
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SIP-2D-2004 a2:91pm Frcm-K & A Enlineerinl, Ine
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+541-884-8358 T-735 P 002/007 F-952
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.ngln.errng
K I A Engineering, Inc.
, P.O. 8u28624, EDgene. OR 87402
521 MIrIr8I St., Soite B, !age... OR 17.
(141) ...... Voice
(141) 184-8361 fAX
1&II_1f 28,1104
Project: 74.04
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Hayden Homes
2464 SW Glacier Place. Suite 110
Redmond, OR g7756 '
Subject Quality assurance. house foundation pad construotion
Jasper M&adows SubdMsion - ~ Addltlon
Springfield. Oregon
PURPOSE AND SCOPE
As I'8qU98led, K & A Engineering, Inc. has complet8d monftor1ng the construction of Individual foundation pads
at the subject new residantlBl.UbdM81on. 39 imflYidL181 foundation pads W8ft constructsd at the site and
prepared ready for forming new foundaUons.
PrIOr to construotion, a G9OteChnlcallnvm!gation' was made of the subdivision to develop specific
f1ICom.I.~.. Jattons for developing 1118 slt810r rlllldent181 fou~atIons,~. and UUUtl8s.
Tlle purpose of our IllVices was to provkle monItOr constructlon of foundation paas to assure 1hat c:onmmtion
cl1t8r1a outlined In the ge0t8chn1ca1lnvestlgation was adclr88aed. .
11lls report documents foundatlon pad construction and makes recommendatiOns tor suitabIlity for reskfent/!/
foundation construction.
FOUNDAllON PAD EXCAYAnGN
Gill_
The foundltion pads developed for this project are to BUpport conventionally framed lISid.,ntial aInJctur8a
tuppotted by conventional cast-ln-place concrotB SprBad fOOCings. Due to the slope or the SItS most or tile
foundation pads were constructed In two or mOf'Q benohes, separated In grade by approximately 1 to 2.flIet
FoundadoII hill
11Ie Geotectlnlcallnv88tlgaUon (BoIr1) had predicted that hIgh Plasticity silts or clays would underfle the site.
excavation for 1ha pacl8 conftnned that in most of the foundation pads, 1here was 1 to 3-feet of a gray, highly
plutlc, modBraI8Iy stiff. and moist silt. In some locations the gray siR contained a slgnlftcant amount of sub-
rounded Ign8ou8 cobbles, ThIs silt was often covered by 0.6-10 1.o-1eet of damp, vel}' Iow-denslly peaty siltS,
Weathered yaIow-tan tuffaceous siltstone or sandstone was encounl8nKl underneath the plastic sills.
1 BOfre AstocIafIIs. Inc., G80IeChnIcaJ lnvesIgdon for lie Jasper Meadows Seeond Addition, Sprtngfteld, Oreoon,
fIbruary 16, 2003.
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Sep-20-2004 02:31pm From-K & A En'lnaarin" Inc.
+S-il-GB4-me
T-tS5 P.ODS/007 F-952
K & A Ellalneerfng, Inc.
The gray plastic sib and gray plastic tlllte with cobbles were deepest through the westsm portion a11he
subdivision. IsoIat8d zones of gray plastic sltt or plastic sltt with cobbles Will also encountered throughout 1tIe
central and eastern portions of the eubdlvlslon.
fUlDluUoa Pad GontlrucllOR
Because the depth and ..nt of soYs varied significantly across the subdlv"lQn, .,aah pad was evaluated
IndMduaUy to detlrmlne the proper depth of excavation and tile amount 01 select fin to be placed in the
excavation.
For mam' Qf ~ foundatiOn pads, the depth to weathered slRstone or sandstone was less than 2..feet and, In
th8&8 cases. the foundation pads were excavated to bedmCk, and gradtd smooth, level, and frBe from loose
matertal6. In ~ C8$8$ the ba86 or the excavation was in two benches separated in grade from 1 to 2..feel
seJect aranular fill WI8 placed In the prepared excavation and brought to footing gnKle,
In those arus of dMper gray plastic sUI, the sifts were removed to a minimum depth of 1 &-inch88 below fooUno
gmIe. The batlDma Of the excavations were graded smooth, revel, and free from loose matfJrials. In most
cues the base of tho mccavatIon was In two benches separateclln grade from 1 to 2-f88l 8eIect granular fin
W88 placed in the pttIfJat'Qd axcavatlon and brtl\l(Jht to footing arade.
In aU cases wher8 peaty slits WGI1l encountered, the peaty-slits were complelely remavad frOm the foundation
area.
hItOt Granular FilII
Select granular fills consisted 01 a sub-base material and a baSe rnatet1aI. The SlJb..bue mablriaI was placed on
1M pt8p8I8d subgrade in the foundatton pads and con_d or a S-lnch minus weU.graded quatty aggragatB.
The bQe material was placed over the stJb-l)ase rock and conslstBd of a 1 *Inch minus denselIracled quarry
aggregate. Both aggregatea were produced at the Morse Bros. Quany In Sprlngftetd.
lJJ8 sub-baSe ttiOJCnIU generallY ranged from 6 to 12-inches. Base rock ranged from 4 to 12..tnches In
1hIckne8a. In a fvw aues (Iot8 33 through 39) the sub-base rock was elimInated and base rock was used
exclustveJy for the iBlect granular flU.
The &elect granular filla were well compacted in 12-inch maximum lifts (loose) using a steel-wheeled VIbratory
roller. Water was applied 18 rMlCBSSary to maintain opllmUm water content during compactIOn.
DenIIty or 8c11cl....1ar RIll
SIJb..IJa$e
The density of the sub-base was evaJuatBd by InSpection Of placement methods and fleld evaluaUon of water
content. The denslly wag considered adaquate If passes by the large vibratory ataekIrum roller did not I8aVe
visible markS In the stlb-base aggrega1B at the edges of the drum BJ1d if the soil wamr cormmt appeared to be
near optimum as d8termIned In the field.'
2 Sqll862lna a small amount of lJellner IOQl8O'ate in fie hand dld oot produce silJllibnt free water and would remain In a
relllively uniform ~ wifIout in1n'IedIately failing apart.
Project 74.04 Jasper Meadows Subdivision PhaSe II, Springfield, OR
ClI6IIt Hayden Homes
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