HomeMy WebLinkAboutObservation of Excavation 10.20.20221(+A Kumw&Awoc1ate% BEng
Geofechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
Z 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
October 20, 2022
Domoplex, LLC
Attn: Slawek Wojciuch
2550 Highway 82, Unit 108A
Glenwood Springs, Colorado 81601
slaweWdomoplex.com
Project No. 21-7-48 LA
Subject: Excavation Observation, Proposed Residence, Lot 35, Filing 9, Grosbeak Place,
Elk Springs, Garfield County, Colorado
Dear Slawek:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on January 19, 2023 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 June 24, 2021, Project No. 21-7-481. The current
observation was performed in accordance with our agreement for geotechnical engineering
services with Domoplex, LLC dated January 18, 2023.
At the time of our visit to the site, the foundation excavation was not yet complete and had been
cut in 2 levels from about 11 feet to about 5 feet below the adjacent ground surface with depth
decreasing toward the south. At all foundation levels the excavation exposed dense basalt
gravel, cobbles, and boulders in a hard highly calcareous sandy silt matrix. No free water was
encountered in the excavation and the soils were slightly moist to very moist, probably from
snowmelt.
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 footing and
slab areas to expose the undisturbed natural soils prior to the placement of structural fill or
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.
Domoplex, LLC
October 20, 2022
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
David Noteboom, Staff Engineer
-
Reviewa '--
Steven
SLP/ka
Kumar & Associates, Inc. Project No. 21-7-481.A