HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
S,p-2D-2DD4 a2:Slpm Frcm-K & A Enllneerlnl. Ine
+541-B84-9350
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1-735 P 002/00T F-952
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K I A Engineering, Inc.
P.O. 80128624, E8gene. OR 17a
521 Markel St., Suite II, Eapn. OR 17.
(141) ...... Voice
(141) 114-" FAX
September 21, 28D4
Hayden Homes
2464 SW Glacier Place, SUb 110
Redmond, OR gn58
SUbject: Quality 88SU11l1C1 - house foundation pad construation
Jasper M6adows SubdMsion - ~ Addition
Sprfngfl8ld, Oregon
PrajecI: 74.04
PURPOSE AND SCOPE
As J'8qU88t8d, K & A Engineering. Inc, has complet8cl monitoring the construction of IndMdual foundation pads
at the SUbject new residentlalsUfK!MaIon. 39 incflVidlJ8/ foundatIOn pads W8t1 construc:f8d at the site and
prepared ready for 1mmfng new foundaUons.
Prior to COflstruotion, a Geotechnlcallnvestlgation' was made of the subdivision to develop specific
recommandaUons for d8veloprng ttI8 site for IISIdentI8I fou~atlonsr~' and uuutl8s.
1118 purpose of our lSlI'Vices was to provide monflOl' construction of foundation paas to assure that conatruation
criteria outIIneclln the geotachnIcaJ Investigation was addressed. .
11lls report documents foundatlon pad construction and makes recornmendations for suitability for residential
foundaUan c....IOIIL JCtIon.
FOUNDA11ON PAD EXCAVAnON
GIIIII'II
The foundltion pads devefoped for this project an: to support conventionally framed residllntial structur8a
tupportlld by cotlV8ntlonal cast-ln-place conCI'GtB spnIad faotirigs. Due to 1he slope or tile Sh most of the
foundation pads wtl1 constructed In two or more benches, separated In grade by appl'DXimalely 1 to Nut.
Found8doa hill
The Geotectmlcallnve8tklatlon (BoIre) had predJc1e(l that high plasticity sills or clays would underUa the site.
Excavation for 1118 padS conflnned 1hat in most of !he foundation pads. 1Ilere was 1 to 3-feet of a gray, highly
plastic, modllral8ly stiff. and moist silt. In some locations the gray sI~ contained a significant amount of sub-
roundeCllgneOU8 CObbles. This silt was ofIBn covered by 0.6-10 to-feet of damp, very low..tfenslty peaty sIltS.
Weathered )'BloW-tan tuffaoeous siltstone or sandstone was encountered underneath the plastic slll8.
1 BOlte ~ Inc., G80luChnlcal ~on for tie Jasper Meadows Second Additicrt, Sprtngftsld, 0I10OI1.
FtbrUIry 16. 2003.
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K & A Enafneerlng, 104:.
The gray plastic sills and gray plastic ,11t8 with OQbb~B Wefi deepest through rhe westem portion 01 the
subdivision. IsoIat8d zones of gray plastic sltt Dr plastic slK with cobbles WIre also 8ncOUnt~ throughout the
central and eastern portions at the subdMslon.
Faunalilllr Pad GonatruclloR
Because 1he depth and 8l4ent of solis varied significantly across the subdlvl~IQn, .,soh pad was evaluated
IndIVIdually to detlrmlns the proper depth of excavation and tile amount of select fin to be placed in the
excavation.
For many of ~ foundation pad8, the depth to weathered slRstone or sandstone was less than 2.feet and, In
these cases, the foundation pads were excavated to bedrOCk, aner grldad smooth, JeveI. and free from loose
matvmls. In ~ casas the baSe or the excavation was in two benches separated in grade from 1 to 2.feet.
select granular fill wu placed In the prepared m<<:aVation and brought to footing grade.
In those at8a of deeper gray plastic sI, the sifts were removed to a minimum depth of 1 &-inch88 below footing
grade. The batlDrrB of the excavations were grBded SmootI'l, level, and free from loose materials. In most
cases the base of the excavation was In two benches separated In grade from 1 to 2-faBt. Select granular nn
was placed in the pt6pat'(Id axcavatlon and brwght to footing grade.
In aU cases whenl peaty slits were encountered, the peaty-silts were completely ret'I1OIJtd fn)m the foundation
area.
SGIeOt 8rInUIar FilII
Select granular fills consisted of a sub-base material and a baSe material. The stJb..bue matlnaf was placed on
1M prepared subgrade in the foundation pads and con_d of a S-lnch mInus waU.grad8d quany agoregatB.
'Ibe ~8 material was placed over the sub-f)ase rock and consl8tBd of a1 *'nFh minllS del188..graded quarry
aggrsgate. Bath acmriQ8t8S Wire produced at the Morse Bros. Quany In Sprlng1leld.
11Ia stJb.baco thiftJtnesI generallY ranged tram 6 to 12-inchss. Base rock ranged from 4 to 12-inches In
1hfo1cne88. In a tvw aU88 (Jot8 33 thrOUGh 39) 1f1e sub-ba8e rock was elimInated and base rock was used
exckJ91v81y forthe ;sIect granufar fill. '
The select granular fiRs were weD compacted in 12.inch maximum lifts (loose) using 8 steet-wheeled Ylbratory
roller. Water was applied 88 neceasary to maintain optimum water content during compaction.
DenIIty or llIecl..... filla
Sub-base
The density of Ute sub-baSe was evaluated by InSpection of placlVllent maIhods and fleld evaluaUon of water
content The densily was considered adequate It passes by the large vibratory stael-drum roller did not leave
visible markS In the stlb-base Bgg~ at the edges of the drum II1d if the soil water corrtBnt appearud to be
near optimum 88 d8IennJned In the ftBld. e
2 Squeezing a small amount of lie nner aaanlaaa in the hand did not produce significant free water and would remain In a
rellliYely uniform ball wit1aut immediately tafllng apart.
Project 74.04 Jasper Meadows Subdivision Phase II, Springfield, OR Page 2 Of 3
Client: Hayden Homes september 201 2004
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