HomeMy WebLinkAboutObservation of Excavation 04.23.19'UAilk & A ate, Inc. 5020 County Road 154
Geotechnical andd Materials Engineers Glenwood Springs, CO 81601
and Environmental Scientists phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
An Employes O m9d Compmy www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
April 23, 2019
Gruenefeldt Construction
Attn: Dan Gruenefeldt
P.O. Box 1910
Basalt, Colorado 81621
dan(a,,gruenefeldt.com
Project No. 18-7-752
Subject: Observation of Excavation, Proposed Residence, Lot E18, Aspen Equestrian Estates, 29
Equestrian Way, Garfield County, Colorado
Dear Dan:
As requested, the undersigned representative of Kumar & Associates, Inc. observed the excavation at
the subject site on April 23, 2019 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 January 14, 2019, Project No. 18-7-752.
At the time of our visit to the site, the foundation excavation had been cut in one level from 2%2 to 3'/2
feet below the adjacent ground surface. The soils exposed in the bottom of the excavation consisted of
natural silty sandy gravel with cobbles on the eastern third of the building area and 3/ -inch road base
fill on the western two-thirds of the excavation. The road base fill was well -compacted and was up to
about 1 foot thick and overlies the natural gravel soils. No free water was encountered in the
excavation and the surface soils were slightly moist to moist.
The natural gravel and structural fill soils exposed in the excavation are consistent with those expected
on the site and suitable for support of spread footings designed for the recommended allowable
bearing pressure of 1,200 psf. Other recommendations 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 (MOBC) developing in the future.
Gruenefeldt Construction
April 23, 2019
Page 2
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,
Kumar & Associates, Inc.
Daniel E. Hardin, P.
Rev. by: SLP
DEH/kac
0 24443 Z;
Kumar & Associates, Inc. Project No. 18-7-752