HomeMy WebLinkAboutObservation of Excavation 10.20.2020tcrt#ffiffi$å*.*
An Emdoycc Ovrtncd Compony
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email : kaglenwood@kumarusa.com
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Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
October 2A,2020
Gould Construction
Attn: Dave Hillbrand
6874HiSway 82
Glenwood Springs, Colorado 81601
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Project No. 16-7-342
Subject: Observation of Excavation, Proposed Phase 3 Mini-Storage Facility,1097 County
Road 116, Across from Glenwood Springs Airport, Glenwood Springs, Colorado
Gentlemen
As requested, a representative of Kumar & Associates observed the excavation at the subject site
on October 20,2020 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations for the foundation design are presented in this report. The
services were perlormed in accordance with our agfeement for professional engineering services
to Gould Construction, dated August 19,2016.
The proposed mini-storage facility will consist of three single-story multi-unit buildings
extending south from the existing building supported on thickened-edge, reinforced slab-on-
grade foundations. The foundations have been designed assuming an allowable soil bearing
pressure of 1,500 psf.
At the time of our site visit, the building areas had been cut down and backfilled to the proposed
bearing level. The underlying soils exposed in the excavations consisted of relatively dense, silty
sandy gravel and cobbles. Class 6 road base had been placed and compacted to fine grade the
foundation and pavement areas. No free water was observed in the excavations and the soils
were slightly moist to moist.
Considering the conditions exposed in the excavations and the nature of the proposed
construction, reinforced slab foundations placed on the undisturbed natural or suitably
compacted gtanular soils designed for an allowable bearing pressure of 1,500 psf should be
adequate for support ofthe proposed buildings. Loose disturbed soils in foundation areas should
be removed or compacted. Continuous foundation thickened edges should be reinforced with
longitudinal and hansverse steel. 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 soil bearing observations 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
Gould Consfuction
October 20,2020
Page2
conditions fbr possible changes to recommendation contained in this letter. Our scrvices do not
include detei:nining the presence, prevention or possibility of mold or other biological
contaminants (MOBC) developing in the future. If the client is concemed about MOBC, then a
professional in this special fìeld of practice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
James H. Parsons, Ë.1.
Reviewed by:
Steven L. Paw
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cc: Mark Gould
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Kumar & Associates, lnc. o'Project No. 16.7.342