HomeMy WebLinkAboutPermit Field Test & Inspection Report 2004-9-20
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SIP-20-20D4 ~2:9Ipm Frcm-K & A Enllneerlnl, Inc
+541-884-9358
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K I A Engineering, 'nc.
P.O. 80128624, E....... OR 87a
521 MI. Il, Suite B. !up.., OR 17.
(541) I84-8a8I Voice
(141) 184-8368 FAX
September 28, _
Hayden Homes
2464 5W Glacler Piece. SUb 110
Redmond, OR 97758
Subject: Quality assurance. house foundation pad construotion
Jasper Meadows SubdMsion - 2nd Addition
Sprfngfl8ICI, Oregon
PrajeId: 74.OC
PURPOSE AND SCOPE
AsI'8quested. K & A Engineering, Inc, has complet8d monrtortng the consbuctlon of Individual foundation pads
at 1he subject new residentlalaU!K!M8Ion. 39 individual foundation pads Wlrt construcl8d at the site and
prepared ready for fonnJng new foundaUon$.
Prior to construotion, a Geotechnlcallnverigation1 was made of the subdivision to develop specific
f8Commsndatlons for developing tile site for I'Isident181 fou~atlons,~. and UlBltl8s.
ltt8 purpose Of our IIBJVices was to provide monitOl' construction of foundation paas to as&llr8 that conatruotion
crftetla outlined In the geotechnical Investigation was addr8Saed. .
1111s report documents foundatlon pad construction and makes recommendatiOns for suitability for resldentllll
foundation construdIon.
FOUNDA'OON PAD EXCAYAnON
GBllBI'II
The foundation pads developed for this project an: to IiUpport conventionally framed residential atnICtul'88
supported by conventional cast..jn-place conCRlte spread footings. Due to 1he slope or tI18 SIt8 most or till
foundation pads were constructed In two or more benches, separated In grade by appraxilTJlltely 1 to 2-fllet.
FeundIdOD saill
ll1e Geotechnlcallnve8tlgatlon (Bofre) had predicted 1hat high plasticity slits or clays would underUe the site.
Excavation forb pad8 confirmed that in most of the foundation pads, there was 1 to 3-feet of a gray, hlgtdy
plutic, moderallly BtIff. and moist slll In some Ioc:ations the gray sI~ contained a significant amount: of sub-
rounded Ign8OU8 cobbJe$, This silt was orten covered by 0.&.10 1.Q..feet of damp, very low--denslty peaty siltS.
Weathered ydow-tan tuffaceous siltstone or sandstone was encountonKl underneath the plastic sills.
1 BOIre AsaOcIatBs. Ine" G~,:",,_[ .nIcaIlnvesIgaIlon for tie Jasper Mladowe Second AdditiCII, Sprlngfteld, Oreoon.
FtbnJary , 6, 2003.
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K & A Engineering, Inc.
The gray plastic slits and gray plastic -ullta with oobbles were deepest through the westem portion 01 the
subdivision. IsoIatBd zones of gray plastic sltt or plastic silt wtth cobbles wtIl1 also encountered throughout 1he
cerrtJal and eaatem portions at the eubdlvlsfan.
Faundllian Pad ConllrlclloR
Because 1he depth and extent of soDs vaned significantly across the subdlv~lQnJ .,ach pad was evaluated
IndMduaOy to determine the proper depth of excavation and tile amount 01 &elect nn to be placed in the
excavation. '
For many t1f tho foundatiOn pad8. the depth to weathered slftstone or sandstone was Jess than 2..feet and, In
Iheso cases. the foundatiOn pads were excavated to bedrOCk, anCf graded smooth, level, and free from loose
materials. In ~ C8$8S the base or the excavation was in two benches separal8d in grade from 1 to 2.feet
select aranular fill wu placed In the prepared excavation and brought to footing grade.
In those areas of deeper aray p1astlc sit, the silts wars removed to a minimum depth of 1 &-inche8 below fooUnu
grade. The battolTl$ 01 th9 excavatlons were grnded smooth, level, and free from Iaose matBrlals. In most
cases 1he base of the mccavatJon W88 In two benches separated In grade from 1 to 2-f8el Select granular fin
was placed in the ~ axcavatlon and brooght 1D footing grade.
In all cases where peaty slits were encountered, the peaty-slits were completely remavad frOm the foundallon
area.
SGItOt CIr8nuIar FilIi
Select granular fills consisted of a sub-base matertal and a baSe material. The SlJb..bua mabnjaf was placed on
11\8 prepared subgrade in the foundation pads and consrstBd of a a-tnch mlnUc weU.gradld quany aggragat8.
'The baGe material was plac84 over the stJb.i>ase rock anti consl81Bd of a 1 ~nch minus dense-oraded quarry
aggregal9. Bo1h aggr1Q8teS were produced at the Marse Bros. Quany In Sprlng1leId.
1110 stJb..basG tf1iCkneIS generallY ranged from 6 to 12-inches. Base rock ranged from 4 to 12-1nches In
1hIckneas, In a fvw aoes (Iot8 33 through 39) tf1e sub-ba8e rock was eliminated and base rock was used
exctuslv8ly for1he uIect granular flU.
The select granular fiUS were well compacted in 12-inch maximum lifts (loose) using a steel-wheeled v1~ ~t J
roller. Water wu applied 88 necessary to maintain optlmUm water content during compaction.
DenIIty or ..... Onnmlar RIll
SUb-base
The densfty of the sub-base was evalUated by InSpection of placement metI10ds and fleld evaluaUon of water
content. The denslly was considered adequate If passes by the large vibratory stsel-drum roller did not f8ave
visible markS In the stJb.base aggrqm at the edges of the drum Bnd if the 80iI wal8r contBnt appeared to be
near optimum 88 d8tennIned In the field. a
2 Squeezing a small amount of 118 ftn8r IOlJJ8Uall in the hand did not produce silJflfficant flte water and would r&maIn In a
relllMly uniform ~ .out 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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