2981 Pilot Knob Rd - ITCO Allied Engrg. Test Co.fjoo /Hatt Ta /I/PA-44 8' GG�j
ITCO ALLIED ENGINEERING COMPANY
AN ALLIANCE OF INSTANT TESTING COMPANY AND ALLIED TEST DRILLING
Jobsite and Laboratory Testing, Geotechnica/ Services, Commercial. Residential and Municipal
7125 West 126'" Street, Suite 500, Savage, Minnesota 55378
Telephone: 952 - 890 -7366 Fax: 952 - 890 -5883
September 24, 2010
Attn: Tony
2981 Pilot Knob Road
Eagan, Minnesota 55121
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Cell: 612 - 968 -0100
RE: 2981 Pilot Knob Road
Eagan, Dakota County, Minnesota
As requested, a site visit was made on September 24, 2010 at 10:17 A.M, to evaluate and test soils
for an addition to a residential structure. Our surficial geology reference indicates that the site is
located within a region of a Demoines Lobe Deposit. These soils consisting primarily of, sand,
loamy sand and gravel, with a coarser texture near lobe edge. We would classify these materials
as Class 1 (Group 1) — unified soil symbol: SW -SP (sands, gravelly sands with fines). This
material would be expected to provide, good drainage characteristics, low frost heave potential, and
a low level of expansion.
It is our understanding that a shallow foundation design has been proposed for the new
construction, similar to that of the existing residence, which was built in 1953. It is also our
understanding that the residence has not suffered any settlement or structural defects based of the
foundation design, relative to frost or other soil related issues. We would therefore anticipate
acceptable soils for construction, when determined to be within allowable limits of moisture and
consolidation.
At the time of the inspection, a limited excavation had been completed to a depth of approximately
30" from top of foundation, at the front or east side of the residence. To investigate the subgrade
soils, a 1 518 inch diameter fluted hand auger probe was put down to a depth of approximately 4
feet, at the low point of the excavation within the northeast. The probe indicated a moist, uniform,
well- consolidated medium sand at depth.
The load bearing capacity of the soils were evaluated with a dynamic cone penetrometer conducted
near the northeast corner of the excavation. The dynamic cone penetrometer (DCP), employs a
eight kilogram (17.6 pound) hammer to drive a 20 millimeter diameter conical point into the soil, with
the penetration recorded in millimeters per blow. From the DCP readings, a per blow, penetration
average was recorded and a N -value derived. This N -value is an empirical relationship we have
established to equate the dynamic cone data to the more familiar blows per foot (BPF) standard
penetration soil boring test.
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DCP Depth
755 MM (29.T)
In our opinion, the observed and tested sub -grade soils are acceptable, and would be expected to
meet an assumed minimum bearing capacity requirement 2000 PSF for the proposed construction.
Our observations and subsequent soil evaluation on this date is limited in scope to soil conditions
observed within the completed excavation, and to the depths achieved by a shallow probe and a
dynamic cone penetrometer test. Therefore, we are unable to assess sub -grade soils at depths,
which may be encountered by soil borings conducted as part of a standard subsurface geotechnical
investigation.
Sincerely,
Itco Allied Engineering Company
Gary Sta dish
Senior Inspector
Dynamic Cone Penetrometer Test
Per Blow Avq. 1 N -Value
28.5 MM / N —11
Reviewed By:
4 4 -
CC: - City of Eagan Building Inspections
#701 - 1 1 #605 — 3141 #610 — 1#304 — (1) DCP / #612 — 26 1/2
Estimated Load
3750 PSF
Robert P. Sullentrop, P.E.
Minnesota Reg. # 17823
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