HomeMy WebLinkAboutObservation of Excavation 04.21.2023t(tlffi"*"5û20 Counfy Roacl 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email ; kaglenrvood(@kurnanls¿r.com
rvww. k urnaru sâ.comAn Ênployco Ownod Compony
Office Locations: Denver (HQ), Parker, Coloraclo Springs, Fort Collins, Clenwoocl Springs, and Surnmit County, Colorado
Apnl2l,2023
David and Rhonda Jenson
901 Hidden Valley Drive
Glenwood Springs, Colorado 81601
David2832 3 5l@qrnail.com
Project No.23-7-241
Subject: Observation of Excavation, Proposed Residenceo Lot22, Spring Ridge Reserve,
Hidden Valley Drive, Garfield County, Colorado
Dear Mr. and Mrs. Jenson:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on April 14, 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.
Hepworth-Pawlak Geotechnical (now Kumar & Associates, Inc.) previously conducted a subsoil
study for design of foundations at the site and presented the findings in a report dated May 10,
2013, Job No. 113 126A.
The current proposed construction is similar to that proposed at the time of the 2013 report. We
understand the proposed residence is to be founded on spread footings bearing on the natural
clay soils and sized for an allowable bearing pressure of 1,500 psf,
At the time of our visit to the site, the foundation excavation had been cut in multiple levels from
2 to 10 feet below the adjacent ground surface. The soils exposed in the bottom of the
excavation consisted of hard, silty sandy clay. 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 1,500 psf. Loose and disturbed soils should be rernoved in the footing areas
to expose the undisturbed natural soils. Other reçommendations 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
moveme,nt. 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 presenceo prevention or possibility of mold or other biological contaminants
(MOBC) developing in the future. If the client is concemed about MOBC, then a professional in
this special field of practice should be consulted.
David and Rhonda Jenson
April2l,2023
Page2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Aesociates,
Robert L. Duran,
Rev. by: DEH
RLD/kac
cc: Boulder Construction Services, LLC - Matt Jurmu (matt,jurmu@foutdercs.
Kumar & Associates, lnc. d Pro¡ect No.23-7-241