HomeMy WebLinkAboutObservation of Excavation 12.10.18H-PryKUMAR 5020 County Road 154
Glenwood Springs, CO 81601
Phone: (970) 945-7988
Fax: (970) 945-8454
Email: hpkglenwood@kumarusa.com
Office Locations: Denver (HQ), Parkq Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
Decernber 10,2018
Burkholder Homes,Inc.
Attn: Todd Burkholder
P.O. Box 400
Carbondale, Colorado 81623
to dd &lþurkho I d erhome-s i nq. ço¡l
Project No. 18-7-722
Subject: Observation of Excavation, Proposed Katchuk Residence Addition, Lot GV-l,
Aspen Glen,0012 Primrose Lane, Garñeld Couhty, Colorado
Gentlemen:
As requested, a representative of H-P/I(umar obserued the excavation at the subject site on
December 4,2018 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations for the foundation design are presented in this report.
Hepworth-Pawlak Geotechnical (now H-P/Kumar) previously evaluated the bearing soils for
design of foundations of the residence at the site and presented the findings in a report dated
October 15,2001, Job No. 101 689.
The addition will be attached to the west side of the building and be supported on ship footings
sized for an assumed allowable bearing pressr¡re of 2,000 psf.
At the time of our visit to the site, the foundation excavation had been cut in one level from 5 to
7 feetbelow the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of slightly silty sand with gravel and scattered cobbles. The bearing soils had been
covered with construction blankets, were not frozen and appeared medium dense. No free water
was encountered in the excavation and the soils were slightly moist to moist.
The soil conditions exposed in the excavation appear generally consistent with those previously
encountered on the site and suitable for support of spread footings designed for the assumed
allowable bearing pressure of 2,000 psf, Loose and disturbed soils should be removed in the
footing areas to expose the undisturbed natural soils. The bearing soils should be protected from
frost and concrete should not be placed on frozen soils. Other recommendations 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 limited information presented in the previous report.
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
Geotechnical Êngineeting I Erqineering Geology
Materials Tost¡rç I Envircnmental
Burkholder Homes, Inc.
Decernber 10,2018
Page2
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 ofpractice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
H*P*KUMAR
Steven L. Pawlak,
SLP/kac
,
e
1 Sä1t
i{.PVI(UMAR Froiect î"år:. 1 8" 7 -222