HomeMy WebLinkAboutB15-0469_B15-0469 Geotech Report_1453844940.pdf I1 pworth•Pawlak Oeotechnkal, In_
5020 County Road 154
GeOtech Glen volxl Springs,Colorado 81601
Phone:970.945-7988
HEPWORTH-PAWL4K GEOTECHNICAL. Fax:970-945.8454
em.iil:hpgeoghpgeotcch.com
January 22, 2016
Shaeffer Hyde Construction
Attn: Jeff Kissane
P. O. Box 373
Vail, Colorado 81658
JeffK@shaefferhyde.com
Job No. 116 006A
Subject: Observation of Excavation, Proposed Garage Remodel and Addition,
Billingsley Residence, Lot 3, Block 3, Filing 7, Vail Village, 1170
Ptarmigan Road, Vail, Colorado
Dear Jeff:
As requested, a representative of Hepworth-Pawlak Geotechnical observed the excavation
at the subject site on January 19, 2006 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 as part of our agreement
for professional services to Shaeffer Hyde Construction dated January 12, 2016.
We previously conducted a subsoil study for design of foundations for the existing
residence at the site and presented our findings in a report dated August 2, 1999,Job No.
199 239. The existing residence is about 15 years old and is founded on a spread footing
foundation.
The garage area on the south side of the residence will be remodeled and an addition
attached to the south side of the garage. The addition will be a single story of wood
frame construction with a slab-on-grade floor. The addition has been designed to be
supported on spread footings using an allowable soil bearing pressure of 3,000 psf based
on recommendations provided in our previous report.
At the time of our site visit, the foundation excavation for the addition had been cut in
two levels from about 8 to 9 feet below the adjacent ground surface. The step in grade
between the levels was about 1 foot. The excavation subgrade was at footing bearing
elevation of the existing garage. The soils exposed in the bottom of the excavation
consisted of relatively dense, clayey sandy gravel and cobbles. No free water was
encountered in the excavation and the soils were moist to very moist.
Parker 303-841-7119 • Colorado Springs 719-633-5562 • Silverthorne 970-468-1989
Shaeffer Hyde Construction
January 22, 2016
Page 2
The soil conditions exposed in the excavation are consistent with those previously
encountered on the site and suitable for support of spread footings designed for the
recommended allowable bearing pressure of 3,000 psf. There could be some differential
settlement with respect to the existing structure which should be considered in the design.
Loose and disturbed soils should be removed in the footing areas to expose the
undisturbed natural soils and the subgrade compacted. The bearing soils should be
protected from frost and concrete should not be placed on frozen soils. 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 subsurface exploration 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 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,
HEPWORTH—PAWLAK GEOTECHNICAL, INC.
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