HomeMy WebLinkAboutObservation of Excavation 05-.11-2018H.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), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
May 11, 2018
Gruenefeldt Construction
Attn: Dan Gruenefeldt
P.O. Box 1910
Basalt, Colorado 8162I
clan @ gruenefelclt.com
Project No. 18-7-343
Subject:Observafion of Excavation, Proposed Residence, Lot E3, Aspen Equestrian
Estates, 30 Equestrian Way, Garfield County, Colorado
Dear Mr. Gruenefeldt
As requested, a representative of H-P/Kumar observed the excavation at the subject site on May
I 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. Hepworth-Pawlak
Geotechnical, Ini. previou'sly conducted a subsoil study for design of foundations at the site and
presented our findings in a report datecl July 25, 2013, Project No. 113 223A.
The proposed residence will be one story wood frame construction over crawlspace with an
attached garage. Ground floor will be slab-on-grade. The foundation will consist of an insulated
shallow thickened edge slab bearing on sandy clay soils imposing a maximum soil bearing
pressure of 1,500 psf.
At the time of our visit to the site, the foundation excavation had been cut in one level from2r/z
to 3Vz feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of sandy silty 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. The sandy clay soils are' suitable for support of spread footings designed for 1,500
psf with some risk of long term settlement as described in the previous subsoil study. Loose and
disturbed soils should be removed in the footing areas to expose the undisturbed firm soils.
Geotechnical Engineering I Engineering Geology
Materials Testing I Environmental
Gruenefeldt Construction
May 11, 2018
Page2
Other recommendations presented in our previous repolt 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 limited 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.
If you have any questions or need ftrrther assistance, please call our office.
Sincerely,
H-P \KU
Louis E. Eller
Reviewed by:
Daniel E. Hardin, P
LEF,|kac
H.PÈKUÍVIAR Project No. 18-7-343