HomeMy WebLinkAboutObservation of Partial Excavation 08.10.18H.PVKUMAR 5020 County Road 154
Glenwood Springs, C0 81001
Phone: (970) 945-7988
Fax (970) 945-8454
Email: hpkglenwood@kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
August 10,2018
McK Company, Inc.
Attn: Earl McKenihan
11 South Painted Horse Circle
New Castle, Colorado 81647
earl@mckcompanv.net
Project No. 18-7-375.01
Subject:Observation of Partial Excavation, I.at26, Filing 4, Oak Meadows, 0008
Haystack Road, Garfield County, Colorado
Dear Earl
As requested, a representative of H-P/I(umar observed the excavation at the subject site on
August 10, 2018 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations for the foundation design are presented in this report. We
previously conducted a subsoil study for design of foundations at the site and presented our
findings in a report dated July 2,2018, Project No. 18-7-375.
At the time of our visit to the site, the foundation excavation was partially complete and had been
cut in one level from about I to 5 feet below the adjacent ground surface. The soils exposed in
the bottom of the excavation consisted of gravel and cobbles with scattered boulders in a sandy
silt matrix material in the southwest portion of the excavation and very clayey sand with
scattered gravel in the middle and northeastern part of the excavation. No free water was
encountered in the excavation and the soils were slightly moist to moist.
A one foot deep pit was dug in the northern part of the excavation through the very clayey sand
down to clayey sandy gravel and cobble soils. We recommended that the foundation bearing
level be extended down to the clayey sandy gravel soils to achieve more uniform bearing
conditions.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and suitable for support of spread footings designed for the recommended allowable
bearing pressure of 2,000 psf bearing on the undisturbed native gravel and cobble soils. Loose
and disturbed soils and the finer grained very clayey sand soils should be removed in the footing
areas to expose the undisturbed natural granular soils. Other recommendations presented in our
previous report which are applicable should also be observed.
Gêotêchnlcâl Engine€rlng I Engineering Geology
Materials Testing I Envircnmental
McK Company, Inc
August 10,2018
Page2
The recommendations submitted in this letter are based on our observation of the soils exposed
within the partial foundation excavation and the previous subsurface exploration at the site.
Variations in the subsurface conditions below the excavation could increase the risk of
foundation movement. We should be advised of any variations encountered in the excavation
conditions for possible changes to recommendations contained in this letter. Our services do not
include determining the presence, prevention or possibility of mold or other biological
contaminants (MOBC) developing in the future. If the client is concerned about MOBC, then a
professional in this special field of practice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
H-P* KUMAR'pdM*n
Robert L. Duran, E. I.
Reviewed by:
Steven L.
RLDlkac
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H-P*KUMAR Project No. 1 8-7-375.01