HomeMy WebLinkAboutObservation of Excavation 08.29.221(-AKew & Associates,Inc. ®
Geotechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
An Employee Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
September 29, 2022
Victoria Stulgis
220 Harmony Lane
Carbondale, Colorado 81623
victoria.stulgis@gmail.com
Project No. 20-7-358
Subject: Observation of Excavation, Proposed Residence, 187 Harmony Lane, Missouri
Heights, Garfield County, Colorado
Dear Victoria,
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on September 29th, 2022 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 August 14th, 2020, Project No. 20-7-358. The current
observations were performed as additional services to and in accordance with our proposal for
geotechnical engineering services with you dated June 18th, 2020.
At the time of our visit to the site, the foundation excavation had been cut in multiple levels from
about 3 feet to about 10 feet below the adjacent ground surface with depth decreasing toward the
south. At all foundation levels the excavation exposed a cemented sandy clayey silt with basalt
cobbles and scattered boulders. 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 2,000 psf. Any loose and disturbed soils should be removed in the footing
areas to expose the undisturbed natural soils prior to the placement of concrete. 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 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.
Victoria Stulgis
September 29, 2022
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
David Noteboom, Staff Engineer
Reviewed by:
Daniel E. Hardin, P
DEH/kac
Kumar & Associates, Inc. 'e Project No. 20-7-358