HomeMy WebLinkAboutRe: soils test/boat hse ITCO ALLIED ENGINEERING CO.
AN ALLIANCE OF INSTANT TESTING COMPANY AND ALLIED TEST DRILLING
Jobsite and Laboratory Testing, Geotechnical Services, Commercial, Residential and Municipal
7125 West 126th Street, Suite #500 - Savage, MN 55378
Telephone: (952)890-7366 Fax: (952)890-5883
May 30, 2013
Attention: Sven Phone: 612-267-2670
Stonewood Development sven@stonewood.com
7407 Wayzata Boulevard
Minneapolis, Minnesota 55426
RE: 2789 Pheasant Road
Orono, Hennepin County, Minnesota
As requested, a site visit was made on May 30, 2013 at 9:42 A.M, to evaluate and test soils for the
construction of a boathouse at a lakeside residential lot.
At the time of the inspection, an excavation had been completed adjacent to the lake shoreline.
Configured as upper and lower footing lines with bulkheads, placed at an elevation to provide
acceptable frost protection. Soils within the excavation consisted of a sandy clay, with saturated
surface soils and standing water. The contractor was making preparations to draw down the water
with a pumping operation during the inspection.
To assess the strength of the soils, a 5/8�h inch diameter smooth probe was used to penetrate the
base of the proposed footing lines. With full body weight applied, the probes indicated penetration
consistent with cohesive soils of acceptable consolidation.
Additional testing was conducted with a dynamic cone penetrometer to assess the relative load
bearing capacity of the subgrade soil. 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.
Test#1 — Upper Footing Line (Near Mid-point)
DCP Depth Per Blow AvQ. / N-Value Estimated Load
425 MM (16.7") 29.5 MM / N -10.75 3688 PSF
Test# 2 — Lower Footing Line (Near Mid-point)
DCP Depth Per Blow Avq. / N-Value Estimated Load
290 MM (11.4") 20.0 MM / N — 19 Exceeds 4000 PSF
Based on our observations and tests, we would anticipate acceptable soils for construction, meeting
or exceeding an assumed minimum bearing capacity of 2000 PSF. 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 shallow probes and dynamic cone
penetrometer tests.
Sincerely,
Itco Allied Engineering Company Reviewed By:
. �� ��� �_�-
Gary Standish Gordon J. Kopacek, P.E.
Senior Inspector Minnesota Reg. # 7254
CC: City of Orono Building Inspections
#701 - 1 / #605— 1 3/4/#610 — '/4 / #304 (2) DCP / #612 —47.5