HomeMy WebLinkAboutB15-0053_B15-0053 Geotech Letter_1440082920.pdf~ech
HEPWORTH-PA\'rLAK GEOlECHNIC1\l
August 19, 2015
Jim and Carol Schmidt
3901 South Gilpin Street
Cherry Hills Village, Colorado 80113
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Job No. 113 405A
Subjecl; Observation of Excavation, Proposed Pier Footings South of Garage,
t:nit B, 401 Beaver Dam Cirde, Lot 2, Block 4, Vail Valley Third Filing,
Vail, Colorado
Dear Mr, and l\.frs. Schmidt:
As requested by Shaeffer-Hyde Constroction, a representative of Hepworth-Pawlak
Geotechnical, Inc. observed the excavarion at the subject site on August 18, 2015 to
evaluate the soils exposed for foundation support. The findings of our observations and
recommendations for the foundation design are presented in thi'> report, We previously
conducted a subsoil study for design of foundation-; at the site, report dated November 29,
20 I 3 and ob5erved rhe excavation for Unit B residence. report dated June 18. 2015. Joh
No. 113 405A. The current observation was performed in addition to and in accordance
with our proposal for services with you dated October 18. 2013.
Three pier footings are proposed along the south side of the L'nit B garage. Spread
footings placed on the natural granular soils and sized for an allowahle bearing pressure
of 3,000 p-.f were designed for the building support.
At the time of our visit to the site, the pier excavations had each been cut in one level
from 4 to 6 feet below the adjacent ground surface. The soils exposed in the bottom of
the excavations consisted of silty clayey sandy gravel with cobbles which had been
compacted. No water seepage wa<> encountered in the excavation and the soils Y.ere
moisL
The relatively dense granular soils exposed in the excavations are consistent with those
previously encountered on the site and suitable for support of spread footings designed
for the recommended alJowahle bearing pressure of 3,000 psf. Surface water should be
kept out of the excavations and any S-Oftencd soils and mud removed before concrete
placement. Other recommendations presented in our previous report which are applicat:ilc
should also be observed.
The recommendation-. submitted in this letter are bused on our ob,ervation of the <;oil-;
exposed within the foundation exca\:atinn and the previous limited subsurface exploration
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Jim and Carol Schmidt
August 19, 2015
Page 2
at the site. Variation" in the sub•rnrface conditions below the excavation could increa-;e
the risk of foundation movement. We should be advi~d of any variations encountered in
the excavation conditions for possible changes to recommendution'i contained in this
leuer. Our services do not include detennining 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
con~ultcd.
If you have any questions or need further assistance, plea\C call our office.
Sincerely.
HEPWORTH-PAWLAK GEOTECHNICAL, INC.
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