HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
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SIP-20-2004 DZ:Slpm Frcm-K & A Enilneerin., Inc
+54H84-9358
T-795 P 002/007 F-952
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K a A Engineering, Inc.
P.O. Bal28624, E....... OR 87.
521 MIf'bt 11., Illite B. Ea..... OR .7.
(&41) 184 .. Voice
(141) 184-8868 FAX
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Hayden Homes
2464 5W Glacier Place, SlfIte 110
Redmond, OR 97756
Subject: Quality assurance - house foundation pad construotion
Jasper M$8dows SubdMsion - 2nd Addition
Springl\8ld1 Oregon
PmjecI: 74.04
PURPOSE AND SCOPE
As 1'8qU98t8d. K & A Engineering. Inc, has complel8d mOnltoring the construction of IndMdual foundation pads
at the subject new residentlalSUbdMSIon. 39 inDIVidual foundation pads were constructBd at the site and
prepared ready for forming new foundations.
Prior to construction. a Geotechnlcallnvestlgation1 was made of the subdivision to develop specific
tecommsndattons for developing 1tIe site for IIs1dentl8l fou~atlonsr ~, and uuutIas.
The purpose Of our IIfVic8s was to provide monitOl' constructlon of foundation padS to asstn1 that CONtnwtion
crltet1a outlined In the geo18ctm1caJ Investigation was addressed. .
11118 report documents foundaUon pad construction and makes recommendations for suitability for residential
foundation construcfIon.
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FOUNDA11ON PAD EXCAYADON
Gill.
The foundation pads devetoped for this project are to BUpport cOIIVGntIonally framed rnidllntial structunIa
supported by conventional cast-ln-pI8ee conCrotB $,"ad footings. Due to the slope or Ih8 SI8 most or the
foundation pads WlI1 con&tructed In two or moro benohas, separated In grade by appl'm:/. ;ddy 1 to 2-f8et.
FoundIdOa hill
1be Qeotecl'lnlcallnv88tklatlon (Bofre) had predicted that high plasticity sills or clays would underlie the site.
eccavatlon for 1118 pada confirmed that in most of the foundation pads, 1I1ere was 1 to 3-feet t;If a gray. highly
plastic, modllralflly stiff. and moist silt. In some locations the gray ell contained a significant amount of sub-
rounded IgnBou8 cobbles, Thls silt was anan covered by 0.&.10 1.().feet of damp, very low..(fenslty peaty siltS.
Weathered )'IIIlOW-tan ~us siltstone or sandstone was encountered underneath the plastic silts.
1 BOiRl AsaocIatBs, Inc.. Gs ;..",~:., lcaIlBYesIgaIlon for 1m Jasper Meadows kcond AdditiCII, Sprfngfleld, Oreoon.
FtbnIIry 16, 2003.
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$8P-~O-2004 02:31pm From-K & A En,ln88rln.. Ine
+541-694-9358
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T-735 P OD91007 F-952
K & A EnafneerlnG, Ioc:.
The gray plastic sills and gray plastic JIIt8 wfth oobblts were deepest through rITe western portion 01 the
subdivision. IsoIat8d zones of gray plastic sltt or plastic silt with cobbles were also ellCount8l1d throughoUt 1f1e
central and eastern portions or the eubdMslon.
FaundlliaD Pad Gonatrucllon
Because the depth and .ant of solis varied significantly across the subdlvlflon, ~h pad was evaluated
IndlYldually to d8tlrmlna the proper depth of excavation and the amount 01 &elect fin to be placed in Ule
mccavatlon.
For many of th~ foundation pad8. the depth to weathered slRstone or sandstone was less than 2.feet and, In
these cases. the foundation pads were excavated to bedtOCk, and grldad smooth, level, and free from lOose
materfals. In ~ casH the baSe or the excavation was in two benches ssparated in grade from 1 to 2.feet
Select aranular fill WU placed In the prepared excavation and brought to footing arndt:,
In those al!aS of dMper gray plastic sUI, the sifts weAl removed to a minimum depth of 1 &-inche8 bBlow footing
grade. The bottalTl$ 01 the eavatIons were graded smootn, level, and free from loose materials. In most
cases the base of the excavation was In two benahas separated In grade from 1 to 2-fael Select granular no
was placed in the ~ axcavatlon and brooght 10 footing grade.
In aU case$ whenl peaty sllta were encountered, the peaty-silts were completely remavad frOm the foundallon
area.
...
....., Grlmdar Fills
Select granular fills conslst8d 01 a BUb-base mater1al and a baSe material. The 8IJb..base . .1 Ii!.. : rial was placed on
1h8 pl'8plfld subgrade in the foundatton pads and con9fBtBd 01 a S-1nch minus weU.grad8d quarry aggragatB.
The _8 matet1al was placed over the sulJ-llase rock anti consI81Bd of a 11k1nph minus del1SfJ..graded quarry
aggr&gat9. Both aooreoates wart produced at the Morse Bros. Quany In Sprlngtleld.
l11a atJb.bac8 thIaknesI generally ranged from 610 12-inch88. Base rock ranged from 4 to 12-inches In
1hIckneaa. In a few aues (lots 33 through 39) tf1e sub-ba8e rock was elimInated and base rock was used
exclUslV8ly for the aslect granular flU.
The select granular fiUS were well compacted in 12.inch maximum lifts (loose) using a steel-wheeled VIbratOry
roller. Water was applied 88 necessary to maintain optimum water content during compaction.
DenIIty cd ScI8Cl8Rmll.. filla
SUb-base
The density of the Bub-base was evaluated by InSpBCtlon of placement melI10ds and field evalua1ton of water
content. The density was considered adequate If passes by the large vibratory stael-drum roller did not leave
VIslbIe markS In the sub-base agg~ at th8 edges of the drum BJ1d if the eoA water cont8nt appeared 10 be
near opttmum as d8l8ImIned In the ftald. e
2 SqUH2lng a small amount of 118_ lIQDr8DlIlJ in the hand did not produce silJllificant free water and WOlJld f8I1'IaIn In a
rellliYely uniform biI wtf10ut immediately failing apart.
Project 74.04 Jasper Meadows Subdivision Phase II, Springfield, OR Page 2 Of 3
Client Hayden Homes ' september 20, 2004
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