HomeMy WebLinkAboutObservation of Excavation 02.18.2020It+A
Kumar& olab , !no."
Geotechnical and Matedals Engineers
and Errvironrnental Scientists
An Employee Owned Company
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@jk un-iarusa.com
www.kumarusa.com
Office L,ocafions: Denver (i -IQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
February 18, 2020
Edna Montanez
170 Mel Ray Road
Glenwood Springs, Colorado 81601
montanczcdna330(glnail.corn
Subject:
Dear Edna:
Project No. 18-7-330
Observation of Excavation, Proposed Apartment Building, 170 Mel Ray Road,
Glenwood Springs, Colorado
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on September 16, 2019 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 May 31, 2018, Project No. 18-7-330.
At the time of our visit to the site, the foundation excavation had been cut in one level about
3 feet below the adjacent ground surface. Three interior pad footings had been dug 1 foot deeper
near the middle of the building area. All footings were formed and the exterior footings
consisted of rectangular pads with spaces in between them. The soils exposed in the bottom of
the excavation consisted of stiff sandy silty clay. Results of swell -consolidation testing
performed on a sample taken from the site, shown on Figure 1, indicate the soils are moderately
compressible under conditions of loading and wetting. No free water was encountered in the
excavation and the soils were slightly 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 2,500 psf with a minimum dead load of 800 psf as previously recommended.
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 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
Edna Montanez
February 18, 2020
Page 2
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,
Kumar & Associates, Inc.
;ifr%c.
Daniel E. Hardin, .E.0 24443 z,
Rev. by: SLP 7 l r ��
DEH/kac ` Sja►-A-Le
Attachment Figure 1 — Swell -Consolidation Test Results
cc: Kurtz & Associates — Brian Kurtz kurtzengineer{cvvahoo.com
Kumar & Associates, Inc. Project No. 18-7-330