HomeMy WebLinkAboutObservation of Excavation 05.20.2022K+AGeotechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
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phone: (970) 945-7988 1 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
May 20, 2022
Chris Shaw Construction
Attn: Chris Shaw
P.O. Box 2724
Glenwood Springs, Colorado 81602
cshaw8102 cr,hotmail.com
Project No. 22-7-334
Subject: Observation of Excavation, Proposed Residence, Lot 20, Filing 6, Elk Springs,
301 Wood Nymph, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on May 13, 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.
Hepworth-Pawlak Geotechnical (now Kumar & Associates) previously conducted a subsoil
study for design of foundations at the site and presented the findings in a report dated April 12,
2006, Job No. 106 291.
The proposed residence will be a 2-story wood -frame structure above crawlspace with a
slab -on -grade garage. Spread footings placed on the natural soils and sized for the recommended
allowable bearing pressure of 2,500 psf were designed for the building support.
At the time of our visit to the site, the foundation excavation had been cut in 2 levels from
roughly 3 to 7 feet below the adjacent ground surface. The soils exposed in the bottom of the
excavation mainly consisted of basalt cobbles and boulders in a calcareous sandy silt matrix.
The excavation bottom was irregular with some loose disturbed material due to the 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 2,500 psf. Loose disturbed soils in the footing areas should be removed and
can be replaced with compacted road base to design bearing levels if desired. Other
recommendations presented in the 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
Chris Shaw Construction
May 20, 2022
Page 2
(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 & Associ-`-- i--
Steven L. Pawlak.
SLP/kac
Kumar & Associates, Inc. Project No. 22-7-334