HomeMy WebLinkAboutExcavation Observation BLDG Q 10.26.2023K+Aand
Kumr & �.Geotechnical and Materials Engineers 5020 County Road 154
Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
An Employee Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Sununit County, Colorado
October 26, 2023
Rudd Construction
Attn: Eric Rudd
0132 Park Avenue
Basalt, Colorado 81621
eric(i ,ruddconstruction.com
Project No. 17-7-858.A
Subject: Observation of Exploratory Pits, Proposed Buildings U and R, Cattle Creek
Center, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the pits excavated at the
subject sites on September 22, 2023 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 provided recommendations for design of foundations at the site in a report
dated February 7, 2018, Project No. 17-7-858.
Buildings U and R are located on the upper bench to the south of Cattle Creek. The upper bench
was constructed by cutting on the uphill side and filling on the downhill side. The building area
was constructed to existing grade in 2000. The fill was placed for future building support. Strip
footings placed on the natural soils or existing fill and sized for an allowable bearing pressure of
1,500 psf were designed for the foundation support.
At the time of our visit to the site, the pit excavations had been dug with one pit excavated south
of the southwest corner of the existing Building V (for Building U) and one pit excavated north
of existing Building Q (for Building R). The soils exposed in the pits excavations consisted of
about 1 foot of fill overlying silty clayey sand and gravel with scattered cobbles. We expect that
the proposed footing grades will be in the natural soils at these sites. The near surface soils were
slightly moist.
The soil conditions exposed in the excavation are consistent with those previously encountered
at the site and similar to those expected at footing grade. The soils should be suitable for support
of spread footings designed for the assumed allowable bearing pressure of 1,500 psf. Loose
disturbed soils in the footing areas should be moistened and compacted. 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
at the ground surface and the previous review of bearing soils at the site. Variations in the
subsurface conditions below the excavation could increase the risk of foundation movement.
We should be contacted to observe the completed footing excavations at the time of construction.
Rudd Construction
October 26, 2023
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates,
Daniel E. Hardin, P.
DEH/kac
Kumar & Associates, Inc. ® Project No.17-7-858.A