HomeMy WebLinkAboutPermit Field Test & Inspection Report 2008-9-8
,Sep 9 2008 317PM
No, 2775 P 2
.a
K & A Engineering, Inc.
.3327 Roanoke Ave., Eugene, OR 97408
(541) 684-9399 Voice
(541) 684.9358 FAX
I l'T1 9 i T1l' l' r.i n 9
September 8, 2008
Project: 151.06
Hayden Enterprises, Inc.,
2464 SW Glacier Drive #110
Redmond,OR97756
Subject: Jasper Meadows subdivision..Lot 244
Springfield, OR'. S t:"7
Foundation Soils I '\ (iJ ,/
L <? -/<1'6''l(
PURPOSE AND SCOPE
At your request, K & A Engineering, Inc, has completed a geotechnical investigation of the existing soils on the
subject property. Our understanding is that a wood-framed single-family residence supported by a cast-in.
place concrete spread footing'foundation is proposed for cDnstruction on this site.
The purpDse Df ourinvestigatiDn was to determine the SUitability of the sDils for construction of the propDsed
structure, and provide recommendatiDns for cDnstructiDn of the fDundatiDn. The scope Df our services is limited
to general suitability with respect to bearing capacity and expansive soils,
FOUNDATION PAD PREPARATION
The project site is located on a residential lot in the Jasper Meadows SUbdivision on the southwest corner of the
Mineral Way and South 57'" Place intersection, The lot has a very gentle(l to 4-percent) west-facing slope.
There is nD apparent slope movement hazard. The original ground surface was low lying and poorly drained.
. .
Based on the fDundation pad excavatron, native soils consist Df approximately 1 tD 2-feet of brown, dry, IDDse;
organic silt, over multicolored, damp, moderately stiff. plastic clay with inclusions of decomposed sandstone
There is a small amDunt Df fill Dn SDme areas Df the site as a resultDf it,being side-cast during the construction.
. of the subdivisiDn infrastructure. . .
r
F6undation support preparation involved constructing a level foundation pad on a subgrade consisting of,nati~e .
undisturbed soils. This required excavating and removing approximately 1 tD 2,5-feet of side-cast fill and;)
Drganic silt to reach gray plastic clay and decDmposed sandstone in the foundation pad area, After the
excavation and removal of. the unsuitable soils, approximately 2 to 4-feet of "pit-run" was placed, graded, and
compacted in the foundation pad area, The "pit-run" consists of well graded silty crushed quarry stone wifh
crushed rock up to approximately 3-inches, An approximately 4 to 10-inch lift of '1,-inch minus dense graded
crushed aggregate was thimplaced,graded, and compacted over the'''pit-run'' fill. This served 10 provide a
uniform surface for footing construction at the desired elevation. The fill materials were cDmpacted using a
vibratorysteeld rum 'rOller..
Sep 9 2008 n7PM
No. 2775 P 3
. K & A EnginBering, Inc.
We tested the in-~Iace density of the 'I,-inch minus dense graded crushed 'aggregate fill and have determined
that the average dry density exceeds 95-percent of maximum as determined by ASTM D698, The field test'
results are attached to this.report.
SUMMARY AND RECOMMENDATIONS
The project site, as prepared, is suitable to support the proposed foundations We recommend a design
allowable bearing capacity of 2,000-pounds per square foot '
The soils present a moderate shrinkjswellhazard. Foundation loads should bear on undisturbed native clay and
decomposed sandstone a minimum depth of 36-inches below final grade around the perimeter foundation. The
prepared foundation pad meets these recommendations,
Final grading around the foundation pad should raise the grade above the foundation using native or imported
sills and should slope away from the foundation. '
We recommend approval of the foundation pad, as constructed, by the building official.
Thank you lor the opportunity 10 be of service, Please call us if you have Questions or need further assistance.
R"';6,/~
Steve Schultz, EJT,
K ~ A Engineering, Inc,
Client: Hayden Enterprises Jasper Meadows~Lot 244, Sphnglield, OR
Project: 151.06
Page 2 of 2
September 8, 2008
Sep 9 2008. 317PM
No. 2775 P 4
" ..
Density of Soil and Soil-Aggregates In-Place
ASTM 02922 and 030.17
I Project: 151.06
Site Address; Jasper Meadows--Lot 244
I Permit No:
I Date: 9(5(2008
I Density TestType': DT.4
I Operator: SS
I Material Type; 3(4" H from Springfield QuariY
I MaximumOrv Oenstiy, pcf 130,0
1 Standardization and Reference Check ~ Density
(Standard Deviations) (S.D,) 0,35
I
I
It. Moisture,. 1
(S,D;)
1.46
Test No.
1
2
3.
Moist'
Density,
pet
131.1
129,6
138,6
Dry'
Density,
pel
127:5
124:9
1319
Water
Conten~ %
2.8
18
15
Compaction,
%
Remarks
98.1%
96,0%
.1010%
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Average: 99,1%
Std, Dev,; 3.58%
1 Direct Transmission (DT) (specify depth: in.) or Air Gap Backscatter (AGBj (Specifiy(T)ouchable or (U)ntouchable
mode
Test pertormed using Seaman Nuclear Corp model C,300, SN 21113
Client: Hayden Enterprises, Inc.
Project: 151.06
K & A Engineering, Inc.
9(8(2008