HomeMy WebLinkAboutPermit Field Test & Inspection Report 2008-3-10
Mar.l1 2008 4:07PM
No 2428 P 5/7
K & A Engineering, Inc.
3327 Roanoke Ave., Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
~ n gin (>> e'r i n 9
March 10, 2008
Project: 151.06
Hayden Enterprises, Inc,
2464 SW Glacier Drive #110
Redmond, OR 97756
SUbJect. Jasper Meadows subdlvision--Lot 204 618(0 - ( II.., 01 ('./
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 sOlis for construction of the proposed
structure, and provide recommendations for construction of the foundation The scope of our servIces IS limited
to general SUitability with respect to beanng capacity and expansive sOils .
FOUNDATION PAD PREPARATION
The project site IS located on a resldentJallot on the north Side of Cinder St In the new "Jasper Meadows"
subdivision, The lot is level and there are no apparent slope movement hazards The lot IS In a traditionally low-
lying area that is being raised to an elevation even with the surrounding subdIvIsion The lot has recently been
used as a stockpile location for unsuitable soils excavated during the construction of nearby foundation pads.
Based on the foundation pad excavation, soils consist of approximately 1 to 1,5-feet of dark brown, loose,
organic silts, over gray/tan, wet, mOderately stiff, plastic silt and decomposed sandstone,
Foundation preparation involved constructing a level foundation pad on natIve undisturbed SOIls at an adequate
elevation, The stockpile of unsuitable soil for use as foundation support or structural fIll was first removed from
the site and hauled away, Then, approximately 1.5 to 2,5-feet of loose organic Silts, plastiC Silt, and
decomposed sandstone was removed from the foundation pad area. After the excavation and removal of the
stockpile, native unsuitable soils, and soils required to reach the desired elevation, approximately 8 to 18-inches
of o/4-mch minus and 1 1f2-inch minus dense graded crushed aggregate was placed, graded, and compacted
over the subgrade(two different aggregate sizes were mixed). This served to provide a uniform surface for
footing construction, The fill materials were compacted uSing a Vibratory steel drum roller, We inspected the
foundation pad excavation, prior to placement of the granular fills.
Mar 11. 2008 4:07PM
No, 2428 p, 6/7
K & A Engineering, Inc.
We tested the In-place density of the crushed aggregate fill and have determined that the average dry density IS
an acceptable percentage of maxImum as determmed by ASTM D1557(moditied proctor) for 1 Y2-inch minus
dense graded crushed aggregate The field test results are attached to thi~ report, It should be noted that the
standard for 11h-inch minus dense grad~d crushed aggregate IS higher than that for %-Inch minus dense
graded crushed aggregate, and therefo~e more conservative, whIch 1$ why It was used
SUMMARY AND RECOMMENDATIONS
The project site, as prepared, is suitable to support the proposed foundatIOns, We recommend a design
allowable bearing capacity of 2,SOO-pounds per square foot
The soils present a moderate shrink/swell hazard, Foundation loads should bear on undisturbed native Silts a
minimum depth of 30-inches below final grade around the perimeter foundation. The prepared foundation pad
meets these reqUIrements,
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 b~ of selVice. Please call us if you have questions or need further assistance.
Respectfully,
Steve Schultz, E.l.l
K & A Engineering, Inc.
EXPIRES ~
Client' Hayden Enterprises Jasper Meadows-Lot 204, Springfield, OR
Project: 151,06
Page 2 of 2
March 10, 2008
Mar.l1 2008 4,08PM
No. 2428 P. 7/7
Density of Soil and Soil-Aggregates In-Place
ASTM D2922 and 03017
Project' 151.06
Site Address: Jasper MeadowsuLot 204
Permit No:
Date: 3/10/2008
Density Test Type': DT.6
Operator: 5S .._
Material Type: 1 1I2-inch minUs and 3/4-Inch minus dense graded crushed aggregate mixed
Maximum Dry Denstiv. pcf 1440
Standardization and Reference Check ,:\ Density
(Standard DeViations) (S.D.)
083
,:\ Moisture,
(S.D:)
1.00
Moist Dry
Density, Density, Water Compaction.
Test No. pet pef Content. % % Remarks
1 134,8 128,6 48 893%
2 137,5 131,6 45 914%
3 142,1 1361 44 94.5%
4 1397 1330 50 92.4%
I
I
I
I
I
I I
I I
Average 91 9%
Std Dev 216%
, Direct Transmission (D1) (specify depth, In,) or Air Gap Backscatter (AGB) (speclflY(f)ouchable or (U)ntouchable mode
T est performed usmg Seaman Nuclear Corp model C-300. SN 21113
Chent Hayden Enterprises, Inc.
Project' 151,06
K .& A Engineering, Inc.
3/10/2008