HomeMy WebLinkAboutObservation of Excavation 10.01.2018H-PKUMAR
Geotechnical Engineering j Engineering Geology
Materials Testing 1 Environmental
5020 County Road 154
Glenwood Springs, CO 81601
Phone: (970) 945-7988
Fax: (970) 945-8454
Email: hpkglenwood@kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
October 1, 2018
Lukasz Lowisz
P.O. Box 1423
Carbondale, Colorado 81623
lukaszlIc@outiook.com
Project No. 18-7-397.01
Subject: Observation of Excavation, Proposed Residence, Lot 3, Springs Ridge Place, 27
Springridge Court, Garfield County, Colorado
Dear Lukasz,
As requested, a representative of H-P/Kumar observed the excavation at the subject site on
October 1, 2018 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations for the foundation design are presented in this report. The
services were performed in accordance with our agreement for professional engineering services
to you dated June 7, 2018.
We previously conducted a subsoil study for design of foundations at the site and presented our
findings in a report dated July 18, 2018, Job No. 18-7-397. Hepworth-Pawlak Geotechnical
(now H-P/Kumar) previously performed a subsoil study for a different proposed residence at the
site and submitted the findings in a report dated July 31, 2003, Job No. 103 455.
At the time of our visit to the site, the foundation excavation had been cut in one level from 11/2
to 5 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of stiff, sandy, slightly silty clay through most of the excavation with some topsoil
exposed in the area of the garage excavation. To complete the foundation excavation, the
excavation in the garage area needs to be deepened by 1/2 to 1 foot to expose natural clay
subsoils. No free water was encountered in the excavation and the soils were slightly moist to
moist.
The soil conditions exposed in the excavation, excluding the topsoil in the garage area, are
consistent with those previously encountered on the site and are suitable for support of spread
footings designed for the recommended allowable bearing pressure of 1,500 psf. Loose and
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 should also be
observed.
Lukasz Lowisz
October 1, 2018
Page 2
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.
If you have any questions or need further assistance, please call our office.
Sincerely,
H-PKU MAR
Peff/4eiz
James H. Parsons, E.I.
Reviewed by:
Daniel E. Hardin
JHP/kac
Project No. 18-7-397.01