HomeMy WebLinkAboutObservation of Excavation 10.11.20221(+AKumar ni Associates, Ms.®
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 Locafions: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
October 11, 2022
Jake McKittrick
997 Brush Creek Lane
Glenwood Springs, Colorado 81601
j ake@flywateroutdoors. com
Project No. 21-7-647
Subject: Observation of Excavation, Proposed Residence, Lot 14, Spring Ridge Reserve,
144 Spring View Drive, Garfield County, Colorado
Gentlemen:
As requested by Levi Troyer, a representative of Kumar & Associates, Inc. observed the
excavation at the subject site on October 10, 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 December 2, 2021, Project No. 21-7-647.
The proposed residence is similar to that described in our previous report and will be above
crawlspace in the living area with a slab -on -grade garage floor. Spread footings placed on the
natural soils and sized for an allowable bearing pressure of 1,500 psf were designed for the
foundation support.
At the time of our visit to the site, the foundation excavation had been cut in 3 levels from about
2%Z to 5%2 feet below the adjacent ground surface. The soils exposed in the bottom of the
excavation consisted of very stiff to stiff sandy silty clay. No free water was encountered in the
excavation and the soils were slightly moist to moist in deeper cut areas.
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 1,500 psf with a settlement risk mainly if the bearing soils are wetted. Loose
disturbed soils in the footing areas should be moistened and compacted or removed to expose the
undisturbed natural soils. Other recommendations presented in our previous report which are
applicable, especially those to keep the bearing soils dry, 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
Jake McKittrick
October 11, 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 & Associates,
z
S
Steven L. Pawlak, E.
SLP/kac
cc: Dutchman Con
verC&msn.com)
Kumar & Associates, Inc. Project No. 21-7-647