HomeMy WebLinkAboutObservation of Excavation 08.13.2019i
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August 13, 2019
Santiago Mussi Tiscornia
1501 Walz Avenue
Glenwood Springs, Colorado 81601
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Subject:
Dear Santiago:
Project No. 19-7-190
Observation of Excavation, Lot 6, Ranch at Roaring Fork, TBD Surrey Street,
Garfield County, Colorado
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on August 13, 2019 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 conducted a subsoil study for design of foundations at the site and
presented our findings in a report dated March 29, 20:19, Project No. 19-7-190.
The proposed residence is designed to be founded on spread footings bearing on dense gravel or
structural fill above the gravel designed for an allowable soil bearing pressure of 2,000 psf.
Al the time of our visit to the site, the foundation excavation had been cut in multiple levels from
1 to 5 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of silty sandy gravel and cobbles with small boulders. Up to 1 foot of free water was
observed in the lower cut areas of the excavation. The upper soils were slightly moist to wet
with depth.
The dense gravel soils exposed in the excavation are consistent with those previously
encountered on the site and suitable for support of spread footings and structural fill designed for
the recommended allowable bearing pressure of 2,000 psf. tip to about 1 foot of '4 to 1'/2-inch
size screened rock can be placed in areas of the excavation to elevate bearing level above the
ground water. Any softened soils and mud should be removed before placement of screened
rock. The surface of the structural fill should then be compacted with a flat plate vibratory
compactor. 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
Santiago Mussi Tiscornia
August 13, 2019
Page 2
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
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,
Kumar & Associates, Inc.
ArraW 9
Robert L. Duran, E. I.
Reviewed by:
2
Steven L. Pawlak, I' E
RLD/kac
Kumar & Associates, Inc.
Project No. 19-7-190