HomeMy WebLinkAboutObservation of Excavation 10.18.2016H-P=KUMAR
Geotechnical Engineering 1 Engineering Geology
Materials Testing 1 Environmental
5020 County Road 154
Glenwood Springs, CO 81601
Phone: (970) 9454988
Fax: (970) 945-8454
Email: hpkglenwood@kumarusa.com
October 18, 2016
Luis Arreola
698 Bristlecone Way
Silt, Colorado 81652
(a rreo 1 a20 0 6 (a -gma i 1. coin)
Office Locations: Parker, Glenwood Springs, and Silverthome, Colorado
Project No. 16-7-479
Subject: Observation of Excavation, Proposed Residence, Lot 30, Sun Meadow Estates,
South Meadow Court, Garfield County, Colorado
Dear Mr. Arreola:
As requested, a representative of H-P/Kumar observed the excavation at the subject site on
September 27, 2016 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 conducted a subsoil study for
design of foundations at the site and presented our findings in a report dated February 15, 2016,
Job No. 116 019A.
At the time of our visit to the site, the foundation excavation had been cut in multiple levels from
4 to 6 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of natural very stiff, silty sandy 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 and suitable for support of spread footings placed on at least 3 feet of compacted
structural fill and designed for the recommended allowable bearing pressure of 3,000 psf and a
minimum dead load of 800 psf. Loose and disturbed soils should be removed in the footing
areas to expose the undisturbed natural soils. Density testing of structural fill placed below
footing grade was performed and the test results are attached. 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 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. Our services do not
Luis Arreola October 18, 2016
October 18, 2016
Page 2
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 -P- KUMr4R
-•
F
Daniel E. Hardin, P.E.
`t�4�NAL
DEH/ljf
attachments Figure 1 — Laboratory Proctor Compaction Test Report
Figure 1 A — Particle Size Distribution Report
Earthwork Compaction Testing Report
H -P KUMAR
Project No, 16-7-479