HomeMy WebLinkAboutObservation of Excavation 06.10.2021I(+'THffiffi*F'-"
An Emfloyec olnnsd Compony
5020 Counry Road 154
Glenwood Springs, CO 8ló01
phone: (970) 945-7988
fax: (970) 945-8454
email : kaglenwood@kumarusa.com
wwwkumarusa.com
Office l¡cations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit Counç Colo¡ado
June 10,2021
Tate Fairbanks
P.O. Box 2251
Glenwood Springs, Colorado 81602
tateúDtatecivjl.coru
Project No. 20-7-396.4
Subject: Observation of Excavation, Proposed Steel Building, 1001 Bruce Road (County
Road 240), Northeast of City Market, New Castle, Colorado
Dear Tate:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on June 8, 2t2l to evaluate the soils exposed for foundation support. The findings of
our observations and reçommendations 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 September 22,2020, Project No. 20-7-396.
The proposed building will be a steel-frame, steel-skin building with a fooçrint of ap'proximately
120 by 50 feet. Ground floor will be slab-on-grade.
At the time of our visit to the site, the ground surface had been previously filled to level with
onsite gravel material as compacted structural fill. A representative of Kumar & Associates
observed the means and methods of strucfural fill compaction. The foundation excavation had
been cut in 2 levels from 3 to 4 feet below the adjacent ground surface. The soils exposed in the
bottom of the excavation consisted of dense, slightly silty sandy gravel with cobbles and small
boulders. The southwest corner of the excavation is bearing on the compacted structural fill. No
organics or debris were encountered in the foundation excavation. No free water was
encountered in the excavation 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 recoûrmended allowable
bearing pressure of 3,000 psf. Loose disturbed soils should be removed in the footing areas to
expose the undisturbed natural soils. Other recommendations presented in our previous report
which are applicable should also be observed.
The recommendations submitted in this letter are based on our observation of the soils exposed
within the foundation excavation and the previous subsurface exploration at the site. Variations
in the subsurfaee 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
Tate Fairbanks
June 10,2021
Page2
determining the presence, prevention or possihility of mokl or other biological contaminants
(MOBC) developing in the future. If the client is conçerned 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,
Kumar & Associates,
James H. Parsons,
Reviewed by:
Daniel E. Hardin, P.E.
JHP/kac
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Kumar & Associates, lnc.'Ë'Project No. 20-7-396.4