HomeMy WebLinkAboutObservation of Excavation 10.18.20221(+AGeotedmical and Materials Engineers 5020 County Road 154
and 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 Summit County, Colorado
October 18, 2022
Uriel Payan
332 Meadow Lane
Glenwood Springs, Colorado 81601
payanbuilders(ci)hotmail. com
Project No. 19-7-541
Subject: Observation of Excavations, Proposed Additions to Existing Residence,
332 Meadow Lane, Lot 33, Westbank Filing 3, Garfield County, Colorado
Dear Uriel,
As requested, the undersigned representative of Kumar & Associates, Inc. observed the
excavations for additions at the subject site on October 18, 2022 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 performed in accordance with our
agreement for professional engineering services to Uriel Payan, dated September 12, 2019.
The proposed additions will be single story structures with a footprint of approximately 27 by
30 feet on the east side of the house and 6 by 17 feet on the west side of the house. The ground
floor will be structural over crawlspace or slab -on -grade. Cut depths are between 3 and 4%2 feet.
The soils exposed in the excavations consisted of medium dense, silty sandy gravel with cobbles.
No free water was encountered in the excavations and the soils were slightly moist.
Considering the conditions exposed in the excavation and the nature of the proposed
construction, spread footing foundations placed on the undisturbed natural granular soils
designed for an allowable soil bearing pressure of 3,000 psf should be adequate for support of
the proposed additions. The footings should be a minimum width of 16 inches for continuous
walls and 2 feet for columns. Loose and disturbed soils in footing areas should be removed and
the bearing level extended down to the undisturbed natural soils. A perimeter foundation drain
should not be needed. Structural fill placed within floor slab areas can consist of the on -site soils
compacted to at least 95% of standard Proctor density at a moisture content near optimum.
Backfill placed around the structure should be compacted and the surface graded to prevent
ponding within at least 10 feet of the building.
The recommendations submitted in this letter are based on our observation of the soils exposed
within the excavations and do not include subsurface exploration to evaluate the subsurface
conditions within the loaded depth of foundation influence. This study is based on the
assumption that soils beneath the footings have equal or better support than those exposed. The
risk of foundation movement may be greater than indicated in this report because of possible
Uriel Payan
October 18, 2022
Page 2
variations in the subsurface conditions. It is possible the data obtained by subsurface exploration
could change the 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. 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,
Daniel E. Hardin, P.E.
Rev. by: SLP
DEH/kac
cc:
Brian Kurtz (kurtzen ig'neer(d�yahoo.com)
Kumar & Associates, Inc. w Project No.19-7-541