HomeMy WebLinkAboutObservation of Excavation 05.30.18H-PVKUMAR
Geotechnlcal Englneedng I Engineering Geology
Materials Tesüng I Environmental
5020 County Road 1S4
Glenwood Springs, CO 81601
Phone: (970) 945-7988
Fax {970) 94S-84S4
Email: hpkglenwood@kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
May 30,2018
Ed & Michelle Buchman
P.O. Box 1400
Ca¡bondale, Colorado 81623
ed.buchmilr@gmail.com
Project No. l7-7-807
Subject: Observation of Excavation, Proposed Residence, Lot 13, Rock Creek Subdivision,
574 Crystal River Road, Garfîeld County, Colorado
DearMr. & Mrs. Buchman:
As requested, the undersigned representative of H-P/Kumar observed the excavation at the
subject site on May 24,2018 to evaluate the soils exposed for foundation support. The findings
of our observations and recommendations for the foundation design are presented in this report.
We previously conducted a subsoil study for design of foundations at the site and presented our
findings in a report dated December 12,20t7, Project No. 17-7-807.
Atthe time of our visit to the site, the foundation excavatiorl had been cut in multiple levels from
2 to 7 feet below the adjacent $ound surface. The soils exposed in the bottom of the excavation
mainly consisted of natural, slightly silty sandy gravel with cobbles and occasional boulders. No
free water was encountered in the excavation and the soils were slightly moist to moist.
The natural soil 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. The northwest corner of the house site adjacent to the garage was
subexcavated a few feet while we were on-site to remove clay and fill soils down to the natural
gravel soils. Any loose and disturbed soils should be removed in the footing areas to expose the
undisturbed natural gravel soils. Other reconìmendations 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
Ed & Michelle Buchman
May 31,2018
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
H.PtKUMAR
û
tr
rA ?.4Daniel E. Hardin, P.E.çh,/,r
Rev. by: SLP
DEII/ksw
cc:Tenalink structures - Attn: Keith Brand keith e.tçlnalinkstructures.coEq
Tim Hagman, Architect tim @ haernanarçhi tects.com
H-P*KUMAR
Project No. 17-7-8O7