HomeMy WebLinkAboutObservation of Excavation Open Hole Report 11.08.16H-P~KUMAR
Geotechnlcal Engineering I Engineering Geology
Materials Testing I Envlronmenlal
5020 County Road 154
Glenwood Springs, CO 81601
Phone: (970) 945-7988
Fax; (970) 945-8454
Email: hpkglenwoodOkumarusa.com
Office Locations: Parker, Glenwood Springs, and Sllverthome, Colorado
November 8, 2016
WRW Log Works
Attn: Whit Whitaker
102 Deer Valley Drive
New Castle, Colorado 81647
wrw3@hotmail .com
Project No. 16-7-376.01
Subject: Observation of Excavation, Proposed Indoor Riding Arena. 893 County Road
102, Garfield County, Colorado
Dear Mr. Whitaker:
As requested, the undersigned representative of H-P/Kumar observed the excavation at the
subject site on November 7, 2016 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 observed four pit excavations at the site to provide recommendations for
design of foundations at the site and presented our findings in a report dated October 5, 2016,
Job No. 16-7-376.
At the time of our visit to the site, 42 pad excavations had been cut in multiple levels from 3 to 7
feet below the adjacent ground surface. The proposed column pads range in size from 6' x 12' to
nbout 3!h foot square. The soils exposed in the bottom of the excavations consisted of medium
stiff sandy silty clay. No free water was encountered in the pad excavations and the soils were
slightly moist to moist.
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 1,500 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. The bearing soils should be protected from frost and
concrete should not be placed on frozen soils. Other recommendations presented in our previous
report which arc applicable should also be observed.
WRW Log Works
November 8, 2016
Page2
The recommendations submitted in this letter are based on our observation of the soils exposed
within the foundation excavation and the previous limited 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
Rev.by: SLP
DEH/ksw
H-P li: KUMAR Project No. 16-7-376.01