HomeMy WebLinkAboutMiscellaneous Field Test & Inspection Report 2008-6-26
.lun,26 2008 9. 02AM
No.2637 P 5/13
<~~.
-a
K & A Engineering, Inc.
3327. Roanoke Ave" Eugene, OR 97.408
(541) 684-9399 Voice
(541) 684-9358 FAX
pnginppring
Hayden Enterprises, Inc,
2464 SWGlacier Drive #110
Redmond, OR 97756
?
1-.11/ tI/
1.i( PA' N
)'1/
ulM/
'.
June 26, 2008
Project: 151.06 .
,
;,
Subject
Jasper Meadows subdivision--Lot 238
5734 Mineral Way-Springfield, OR
Foundation Soils
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 construction on this site,
:' \,
~~:.~':;'
The purpose of our investigation was to determine the suitability of the soils for construction of the prapo.sed
structure, and provide recommendations for construction of the foundation. The scope of 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 north side of Mineral
Way, The lot is mostly level and there are no apparent slope movement hazards. The original ground surface is
lowlying and is poorly drained,
"
Based on the foundation pad excavation, native soils consist of approximately 8 to 16,inches of dark ,
brown/black, moist, moderately stiff, organic silt, over gray/orange, wet, moderately stiff, plasUc clay mixed
with decomposed sandstone, .
Foundation preparation involved constructing a level foundation pad on a subgrade consisting of native
undisturbed soils, This required excavating and removing approximately 8 to 16-inches of dark brown organic
silt from the foundation pad area, After the excavation and removal'ofthe unsuitable soils, approximately 1,5 to
2,5-feet Of :Y.-inch minus dense graded crushed aggregate was placed, graded, and compacted on the
foundation pad. This served to provide a uniform surtace for footing construction at the desired elevation. The
fill materials were placed and then compacted using a vibratory steel drum roller.
We tested the in-place density of the %-inch minus dense graded crushed aggregate fill and have determined
that the average dry density exceeds 95-percent of maximum as determined by ASTM 0698 The field test
results are attached to this report, . -
i~ un 26 2008 9 02AM
No.2637 P.6/13
K & A Engineering, Inc,
SUMMARY AND RECOMMENDATIONS
The project site, as prepared, is suitable to support the proposed foundations, We recommend a design
allowable bearing capacity of 2,OOO-pou'nds per square foot. .
The soils present a moderate shrinK/swell hazard, Foundation loads should bear on undisturbed native silts 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
silts and should slope away from the foundation,
We recommend approval Of the foundation pad, as constructed, by the building official.
Thank you for the opportunity to be of service, Please call'us if you have questions or need further assistance,
Respect1ully,
~~
,--
Steve Schultz, E.I. T.
K & A Engineering, Inc,
Client: Hayden Enterprises Jasper Meadows-lot 238, Springfield, OR
Project: 151.06
Page 2 of 2
June 26, 2008
Jun.26. 2008 9:03AM
.
Density of Soli and Soli-Aggregates In-Place,
ASTM D2922 and D3017
Project: 151.06
Site Address: Jasper Meadows--Lot 238
Permit No:
Date: 6/25/2008
Densitv Test Tvpe ':IDT'6
Operator: I SS
Material Type:13/4" (-) from Springfield Quarry
Maximum Ory Oeristiy, pc11128.0
Standardization and Reterence Checklt. Density I
(Standard Deviations) (S.D,) 0,27
It. Moisture, I
(S.O:)
Moist Dry
Density, Density, Water Compaction,
Test No, pel pel Content. % % Remarks
1 143,6 135.0 6.4 I 105.4%
2 138,5 131.0 5.7 102.4% 1
3 134.0 128.4 4.4 I 100.3% I
I 1 I
I I I
I I
I I
I 1
1 i
I I
I I
I I
I I
I I
1 I.
I I
I I
I I
I I
1 I
I I
Average: 102.7%
Std, Dev,: 2,60%
No. 2637 P 7/13
0.6
I
1
, Direct Transmission (DT) (specify depth, in,) or Air Gap Backscatter (AGB) (specifiy(T)ouchable or (U)ntouchable
mode
Test performed using Seaman Nuclear Gorp model G-300, SN 21113
Client Hayden Enterprises, Inc.
Project 151.06
K & A Engineering, Ine,
6/26/2008