HomeMy WebLinkAboutObservation of Excavation 08.12.24I (J-rt Hiffifi'ffi:ffinlriri*'"
An EmployeE Owned ComPonY
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email : kaglenwood@kumarusa.com
www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
August 12,2024
Justin Mahaffey
2865 County Road 309
Parachute, Colorado 8 1635
imahaff ev (d,terrae D. co m
Project No.24-7 -297
Subject Observation of Excavation, Proposed Shop Building, 2865 County Road 309,
Garfield County, Colorado
Dear Justin:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on August 8,2024,to evaluate the soils exposed for foundation support. The
findings of our observations and recommendations for the foundation design are presented in this
report. These services were performed as supplemental to our agreement for geotechnical
engineering services to you dated May 10,2024. We previously conducted a subsoil study for
design of foundations at the site and presented our findings in a report dated May 3I,2024,
Project No. 24-7 -297 .
The proposed shop building will be a single-story, steel frame and metal skin structure. The
building has been designed to be supported on a monolithic slab-on-grade with thickened edges
sized for an allolvable bearing pressllre of 1,500 psf.
At the time of our visit to the site, the foundation excavation had been cut in 1 level from I to 2
feet belor,v the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of stiff, sandy silt. No free r,vater \,vas encountered in the excavation and the soils r,vere
slightly moist to moist.
The soil conditions exposed in the excavation are consistent r,vith those previously enconntered
on the site and suitable for support of spread footings (or monolithic slab) designed for the
recommended alloi,vable bearing pressure of 1,500 psf. Loose disturbed soils should be removed
Justin Mahaffey
August 12,2024
Page2
in the foundation areas and the exposed soils moistened and compacted. Other recommendations
presented in our previous report which are applicable should also be observed.
The recommendations submitted in this letter arebased on our observation of the soils exposed
within the foundation excavation and the previous subsurface exploration at the site. Vmiations
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 recommsndations 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. If the client is concarled about MOBC, the,lr a professional in
this special field of prac'tice should be consulted.
If you have any questions or need further assistance, please cali our office.
Sincerelyo
Kumar & Associates, lnc.
James H. Parsons, P.E.
Reviewedby: SLP
rHP/ljf
Kumar & Associates, lnc. 6 Project No. 24-7-297