HomeMy WebLinkAboutObservation of Excavation 08.24.20221(+AGeotechnical 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 Employoo Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
August 24, 2022
Peak 3 Construction + Development
Attn: Bryant Ragan
310 Market Street
Basalt, Colorado 81621
bryant(c�peak3 aspen.com
Project No. 21-7-571.A
Subject: Observation of Excavation, Proposed Residence, Lot 7, Coryell Ranch, Coryell
Ranch Road, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on August 22, 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 3, 2021, Project No. 21-7-571. The current
observation was performed in accordance with our professional services agreement with Peak 3
Construction + Development dated March 28, 2022.
The proposed residence will be above crawlspace in living areas with slab -on -grade floor in the
garage and supported on spread footings sized for the recommended allowable bearing pressure
of 3,000 psf.
At the time of our visit to the site, the foundation excavation had been cut in one level from 2 to
3 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of relatively dense, silty sandy gravel and cobbles with scattered boulders and had been
compacted. No free water was encountered in the excavation and the soils were slightly moist to
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 3,000 psf. 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 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
Peak 3 Construction + Development
August 24, 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 & Assc
Steven L. Pawl,
SLP/kac
Kumar & Associates, Inc. Project No. 21-7-571.A