HomeMy WebLinkAboutObservation of Excavation 9.15.20221(+AandIncGeotechnical and Materials Engineers 5020 County Road 154
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 15, 2022
Tara and Dennis Booth
P.O. Box 4338
Gypsum, Colorado 81637
tarakaybooth14 &gmail.com
Project No. 22-7-113
Subject: Observation of Excavation, Proposed Residence, Lot 3, Highline Ranch
Subdivision, Mustang Mesa Trail, Garfield County, Colorado
Tara and Dennis:
As requested by Jose Gonzales, a representative of Kumar & Associates, Inc. observed the
excavation at the subject site on September 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. We previously conducted a subsoil study for design of foundations at
the site and presented our findings in a report dated March 2, 2022, Project No. 22-7-113.
The proposed building is essentially the same as described in our previous report and will be
supported by spread footings placed on the natural soils with a slab -on -grade floor.
At the time of our visit to the site, the foundation excavation had been cut in one level from 1
to 4 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of very stiff sandy clay. 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 and minimum dead load pressure of 800 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, especially those to keep
the bearing soils dry and to allow for potential slab movement on the building interior, 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.
Tara and Dennis Booth
September 15, 2022
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
Steven L. Pawh P.
SLP/kac
cc: J. Caliber Constrd
(j ose(&caliberconstruction. com)
Kumar & Associates, Inc.' Project No. 22-7-113