HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
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SIP-20-20D4 D2:91pm Fram-K & A Enllneerlnl, Inc
+541-884-9358
T-735 P 002/00T F-952
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fngln'erlng
K I A Engineering, Inc.
P.O. 811128624, Eugene, OR 8740!
521 MIrIreI St., Suite II. EageN. OR 17.
(&41) .... VoIc.
(141) 184-" FAX
8uptembar 21, ..
Hayden Homes
2464 SW Glacier Place. SUIte 110
Redmond, OR Q7756
Subject: Quality assurance - house foundation pad construotion
Jasper M6adows Subdivision - 2,'111 Addltlon
Springfl8ld. Oregon
Project: 74.04
PURPOSE AND SCOPE
As I'8qU98l8d. K & A Engineering, Inc, has completed mOnftor1ng the coostructJon of Indlvlduaf foundatfon pads
at the SUbject new resid8ntlalaUbaMaIon. 39 inDIVidual foundatIOn pads W8t8 construct8d at the site and
prepared ready for forming naw foundaUons.
Prior to construction. a G9OteChnlcallnvmlgation' was made of the subdivision to develop specific
f8Commandatlons for developing the site for 1Is1dent181 fou~ationsr~' anu utilities.
The purpose Of our aBJVices was to provide monitOr construction of foundatlon padS to asstIr8 that conatruation
cl1terla outlined In the geotlchnlcallnvestlgation was addresaed. .
11lIs report documents foundation pad construction and makes recommendationa tor suitability for residential
foundation c..,".'Ib don.
..
FOUNDA11ON PAD EXCAVAnON
GIIIBI'II
The foundltion pads dovetoped for this project are to support convenUonal/y framed l!Sidllntial 8buctut88
supported by conventional cast-ln-pIace conCrotB $pr&ad footings. Due to 1he slope of tile Sb most of the
foundation pads were constructed In two or more benches. separated In grade by approximately 1 to 2-fllet.
FoundIdOa SOill
llIe GeotechnlcallnV8stlgaUon (Bon) had predicted that high p1uticlty sills or clays would underlie the site.
Excavation forb pada conflrmed that in most at lhe fOUlldatlon pads, there was 1 to 3-feet of a gray, highly
plutlc, modBralBIy stiff, and moist silt. In some locations the gray 811 contained a slgnlftcant amount 01 sub-
rounded IgneouS cobble$, ThIs silt was anan covered by O.6-to i.D-feet of damp, very low.-d8ns1ty peaty siltS.
Weathered YBBow-tan tuffaceous siJtstone or sandstone was encountered underneath tf1s plastic slll8.
1 Bolte ~ Inc., Ga. t: .!dlcallnv8dgallon for fie Jasper Meadows Seeond AdditiCll, Sprfngfleld, Oreaon,
FtbnJary 16. 2003.
8 'd l8L9'oN
S3~OH N30AVH ~dH:l 900l '9 'uer
~.p-20-2004 02:31pm From-K & A En,lneerln.. Ine
+5.4HB4-Q36e
T-735 P.OD9/007 F-952
K & " Elalneering, Inc.
The gray plask 8IIIB and gray plastic tlllt8 with oobblea were deepest through the western portion 011he
subdivision. IsoIat8d zones of gmy plastic silt or plastic silt with cobbles well also encountered throughoUt 1he
central and eastern portions at the wbdMslon,
faundlliDB hd C.melloR '
Because the depth and lIXtent of soDs vaned significantly across the Bubdlvl3lQn, ~Dh pad was evaluated
IndIVIduallY to detIrmIns the proper depth of excavation and the amount 01 select fin to be placed in the
excavation.
For manY of ~ foundatiOn pacl8, the depth to weathered slftstone or sandstone was lass than 2.feet and, rn
Ihe88 cases. the foundation pads were excavated to badrOCk, and graded smooth, level, and free from loose
matertals. In ~ cases 1he base or the excavation was in two benches separated in grade from 1 to 2-teet
setect aranular fiI WI8 placed In the prepared mccavatIon and brought 10 footing grade.
In those areas of deeper gray plastic sRI, the silts war! removed to a minimum depth of 1 &-inche8 beloW fooling
grade. The bottoms of the exoavaUons were graded smoottt, level, and free from loose matfJ~als. In most
cues the baSe of tho mccavatfon was In two benahes separated In grade from 1 to 2-faet. 8efect granular no
was placed in the pt&pal'(Id a>roava1lon and broooht to footing grade.
In all cases where peaty sIIt8 were encountered, the peaty-silts were completely remavad frOm the foundallon
area.
0-
IGIeIICIrMUIIr FilII
Select granular fills CDl'lslsted of a sub-base material and a baSe material. The scbobue mal1IriaI was placed on
the prepared subgrade in the foundation pads and con9Istad 01' a S-1nch mInUs weU.grad8d quany 19Q11gata.
The bQe material was placed over the stJb-l>ase rock and consl8tBd of a 1 *'~ minus den881Jl'8ded quany
aggrlg8t9. Both aggregates were produced at the Marse Bros. Quany In Sprlngt/eld.
1ha aub-baa ttioIfn8sI generally ranged from 6 to 12-;nch88. Base rock ranged from 4 to 12-1nches In
1hfcIcnN8, In a fuw aues (Iot8 33 through 39) ttJe sub-ba8e rock was eliminated and base rock was used
exclualV8ty for the uIect granular fill.
The select granular fins ware weD compacted in 12.inch ma>dmum lifts (loose) using 8 steel-Whee!ed VIbratory
roller. Water wu applied 88 necessary to maintain opflmUm water content during compaction.
DenIIty af 811ecl8mlll1ar filla
Sub-base
The density of 1h8 su~base was evaluated by InSpection of placement methodS' and fleld evalua1ton of water
content. The denslly was considered Idaquate If passes by the large vibratory stael-drum roller did not IBM
visible markS In 1118 sub-base 8gg~ at the edges of 1he drum BJ1d if the soil wal9r corrtBnt appeared 10 be
_ optl~ as determined In the field. e
2 SqueezIng a small amalpIt of lie liner lOGl1laal8 in the hand did not produce aiunificant free water and would r&maIn In a
relaliYely uniform bat wit1aut irnmedIateIy failing apart. .
PrOject 74.04 Jasper Meadows SUbdivision Phase II, Spr1f1gfie1d, OR Page 2 of 3
Client Hayden Homes septamb8l' 201 2004
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