HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
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SIP-20-2004 a2:91pm Frcm-K & A En~in8erlni, Ine
+54H8H358
T-735 P 002/007 F-952
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, K I A Engineering, rnc.
p ,0. Bal28624, E....... OR 17a
521 MIrtref St., Suite B. Eugene. OR .7.
(N1).... Voice
(141) 184-8368 FAX
8eptemfJer 28, 2G04
Hayden Homes
2464 SW Glacier Place. Suite 110
Redmond, OR 97758
SUbject Quality assurance. house foundation pad construotion
Jasper M6adows Subdlvlsion - ~ Addition
Springfield. Oregon
ProjIIcf: 74.04
PURPOSE AND SCOPE
As 1'8qU98t8d, K & A Engineering, Inc, has complet8d mDnJtorlng ttJe construction of IndMduaf foundation pads
at the subject new residentlal,Ul)4jM8Ion, 39 indMdual foundation pads were construcf8d at the site and
prepar8d ready tor 10nnJng new foundation."
Prior to construction, a Geotechnlcallnve$gation1 w~ made of the subdivision to develop specific
recommendattons for developing 1tI8 slt8J9f IISIdentI8I fOU~atI0nsf~' and UfJIltI8s.
The purpose Of our .1IVice8 was to provide monltOl' construotlon of foundation paos to asstJrB that c:onatruution
criteria outlined In the geotschnIcaJ Investigation was addressed. .
ThIs report documents foundation pad construction and makes recommendations for suitability for residential
foundaUon constructIOn. '
FOUNDAllON PAD EXCAYAnGN
GIIIBI'lI
l11e faunddon pads developed for this project are to &upport conventionally framed residantial81ructur88
supportlld by conventional cast-ln-pl8Ce conCRltB $prBad footings. Due to the slope or 1118 Sit molt of tile
foundation pads were constructed In two'or more benohes, B8par1ted In grade by approximately 1 to 2-feet
Found8dOII hill
l11e GeotechnJcallnv88tlgaUon (BoIre) had predicted that high plasticity silts or clays would underfle the site.
Excavatlon forb p1(18 conftnned that in most of Ihe foundation pads,1here was 1 to 3-feet of a gray, highly
pl., modaratllly stiff. and moist silt. In some loCations the gray siR contained a slgnlftcant amotmt of sub-
rounded Igneou8 cobble$, 11IIs si~ was artsn covered by 0.6-10 i.D-feet of damp, very low..(fenslty peaty siltS.
Weathered )'BIlOW-tan tuffaceous siltstone or sandstone was encountBr8d underneath the plastic sills.
1 BOIre ~ Inc.. Ge..',,{ Jcallrlv8dgallon for tie Jasper Meadows kcond Additioo, Springfield, Oreoon,
FtbrUaIy 16, 2003,
8 'd ZSL9'oN
S3WOH N30AVH Wdtt:Z 900Z 'g 'uer
Sep-20-2004 02:31pm From-K & A En'ln88rlnl, Inc
+541-GB4-835S
T-T35 P 009/007 F-952
K & A Enafneerlna, lAC.
The gray plastic 8I1t8 and gray plastic ~lIw w~h oabbles were deepest through the western portion of 1118
subdivision. IsoIat8d zones of gmy plastic sltt or plastic silt with cobbles Wire also encDUntered throughout tfle
central and eastern portions at the eubdMs/on.
Faundlliall hi! GOIIdrUcIIon
Because the depth and .ant of soYs vaned significantly across the subdlvlelon, ~ah pad was evaluated
IndlYldually to dstermlne the proper depth of excavation and Ule amount 01 select fiR to be placed in the
excavatlon.
For mam' of ~ foundation pacl8, the depth to weathered slRstone or sandstone was less than 2..feet and, In
these cases. the foundatiOn pads were excavated to bedrOCk, and gilded smooth, level, and free from loose
material6.ln ~ *" the baSe of tile excavation was in two benches separated in grade from 1 to 2-feet.
select aranular III was placed In the prepared mroavatton and brought 10 footing grade.
In those areas of deeper gray plastic sUI, the sifts war! removed to a minimum depth of 1 &-inche8 below fooUno
grade. The batlDms of the excavaUons were graded smooth, level, and free from loose mateflam. In moat
cases the base of tho mccavatfon was In two benGhes separated In grade from 1 to 2-fa8l Select granular no
was placed in tho ptttparad excavation and brooght to footing grade. '
In all C3$e$ whem peaty sots were encountefed, the peaty-siltS were completely remavOd frOm the foundation
area.
l>
SGltot 8rInUIar Fills
Select granular fills consisted of a sub-base matertaJ ancJ a baSe material. The SlJb..buc rnablrial was placed on
the prepared subgrade in the foundatlon pads and con9fst8d of a S-1nch mInUs weU.gradBd quany aggragatB.
The baee mat8rIaI was placed over the sub-J>ase mck and col18l8tBd at a 1 *'"'nph mil1US dense1lraded quarry
aggl1lg8l9. BaIh aggrt08t8S were produced at the Marse Bros. Quarry In Sprlngtleld.
l1J8 sub-baSG thiOkII8SS generally r&rKIecI from 6 to 12-jnch88. Base rock ranged from 4 to 12-1ncheS In
1hIc1m8ea, In a fuw aU88 (Jot8 33 through 39) the sub-base rock was elimInated and base rock was used
exclU9lv8Jy for1he uIect granufar flU.
The select granular fiUS WII'I weD compacted in 12-inch maximum lifts (loose) using a steel-wheeled vibratory
roller. WsIer was applied 88 necessary to maintain optlmum water content during compaction.
DenIIty af 8e11c18nnm1ar filii
SUb-base
The denstty of the sub-base was evatuatBd by InSpection of placement methods and fleld evaluation of water
content. The denslly was considered adequate If passes by the large vibratory 8tseI-drum roller did not IBM
visible markS In the sub-base agg~ at the edges of the drum and if the soH wal8r corrtsnt appeared to be
near optimum as determined In the ftBld. It
2 Squee2lna a smaIJ III1JOlJIlt at 11811n8r aaorealllB in the hand did not produce silJRificant free water and would f8Jl1aIn In a
rellliYely unIfonn bat wtJ10ut irnm8dIately faOlng apart.
Project 74.04 Jasper Meadows SUbdivision Phase II, Sprtngfield, OR Page 2 of 3
ClItnt Hayden Homes september 20, 2004
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