HomeMy WebLinkAboutBLDR-2-10-4776 Engr Soil evaluation 4-14-10.tif Aril 14 2010
April
Mr. Glenn Walter email. gwalter95 @aol.com
MY THREE SONS CONSTRUCTION
154 Greens Road
Granite Falls, NC 28630
RE: Report of Foundation Soil Evaluation
Lot 430 - 4005 Steve Ikerd Drive, NE
Permit #2 -10 -4776
Unifour Job Number 3535
Dear Mr. Walter:
As you requested, Unifour Engineering & Testing Laboratories, PC ( Unifour) was
retained to test and observe the shallow foundation soil for 4005 Steve Ikerd Drive, NE
located in Hickory, North Carolina. Unifour's scope did not include investigation of
deep subsurface conditions or the development of engineering recommendations for
foundation design.
Dynamic Cone Penetrometer (DCP) tests were performed in the soil adjacent to the
foundation footprint of the proposed structure at the bottom of footing elevation (BOF)
and as deep as 5 feet below BOF. The DCP test is performed by driving a 1Y2-inch
diameter steel cone into the soil using a 15 -pound weight falling 20 inches. The
number of blows required to drive the cone 1 3 / inches is designated as the Cone
Penetrometer Resistance and is recorded in units of 'blows per increment' or bpi. The
test procedure is described in ASTM Special Technical Publication STP -399. The
DCP test values were correlated to an estimated Standard Penetration Resistance (N-
value) based on the soil type, using procedures described in STP -399. The field data
and estimated N- values are presented in the attached Report of Dynamic Cone
Penetrometer Test forms.
The foundation soil encountered at and below the BOF at the test locations consisted
predominately of sandy silt. The estimated N- values indicated in the DCP tests were
generally greater than 7 blows per foot (bpf). However, soft soils were encountered
across the rear footing line of the house to depths of up to 4 feet below BOF.
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' Foundation Soil Evaluation -3535 April 14, 2010
4005 Steve Ikerd Drive, NE, Hickory, NC -Lot 430 Page 2
Due to the encounter of soft soils across the rear footing line, Unifour recommends
undercutting the footings per the attached sketch. Unifour recommends that the
undercut excavations should be backfilled with washed stone to the BOF elevation.
The washed stone should be placed in a maximum of 1 foot compacted lifts.
Unifour recommends that all footings should bear a minimum of 12 inches below
existing grades at the time of concrete placement. Unifour should be requested to re-
visit the job site during the modification process of the footings to verify adequate
bearing material has been exposed and that the washed stone has been placed in
compacted lifts.
l
Since bearing capacity of soil is partly a function of soil type and footing width, these
test results should be considered valid only for the locations and elevations noted at
the time of our testing.
I
We appreciate the opportunity to be of service to you on this phase of the project. If
we can provide any additional engineering or testing services please contact us.
i
Respectfully submitted,
UNIFOUR ENGINEERING & TESTING LABORATORIES, PC
By,
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385
Matthew D. Hard I Bobby L. Barnes, PE y L .
Project Engineer Principal Engineer i
Registered, NC 19385
Date:
Attachments: Report of DCP Test 04 -14 -10
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