HomeMy WebLinkAboutObservation of Excavation 12.02.2015HEPWORTH-PAWLAK GEOTECHNICAL
December 2. 2015
Woodbridge Mortgage Investment Fund 2. LLC
Attn: Rick Salvato
22 Center Street, Front Suite
Freehold, New :Jersey 07728
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Job No. 114 550A
Subject: Observation of Excavation, Proposed Residence. Lot D 38, Aspen Glen,
0180 Seeburg Circle, Garfield County, Colorado
Dear Mr. Salvato;
As requested. a representative of Hepworth-Pawlak Geotechnical, Inc. observed the
excavation at the subject site on November 30 and December l, 2015 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
January 9, 2015, Job No. 114 550A.
The proposed residence will consist of a two story wood frame structure over a
crawlspace with a slnlron-grade garage floor. Spread footings sized for an allowable soil
bearing pressure of 1,500 psf were used in the design.
At the time of our visit to the site, the foundation excavation had been cut in one level
from about 3 to S feet below the adjacent ground surface. Generally, the soils exposed in
the bottom of the excavation consisted of dense. slightly silty, sandy gravel with rounded
cobbles. However, very stiff, silty. sandy clay was observed in approximately 10% of the
excavation at the northeastern end. We recommended the clay soils be removed to
expose the gravel below. When observed on December I. the excavation had been
deepened about 1 ~ feet at the northeastern end. The clay soils had been excavated out to
expose the underlying gravel soils and that portion of the excavation was about 6~ feet
below adjacent ground surface. No free water was encountered in the excavation and the
soils were slightly moist
The soil conditions exposed in the excavation are consistent with those previously
encountered on the site and are suitable for support of spread footings designed for an
allowable bearing pressure of 2,500 psf as previously recommended. The bearing soils
should be protected from frost and concrete should not be placed on frozen soils. Other
recommendations presented in our previous repon which are applicable should also be
observed.
Parker 303-841-7119 • Colorndo Springs 719-633-5562 • S1lvcnhome 970-468-1989
Woodbridge Mortgage Investment Fund 2, LLC
December 2, 2015
Page 2
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 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.
Robyn C. Brown, P.E.
Revicwged by:J. ,~: :·~·E~·~~·> •. ,i:·ii,
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Riverstone Structural Concepts -Jake Tinunons (igke@Jiver~1onesc.com )
Job No I 14 SSOA
November 24, 2015
Mr. Pete Waaraniemi
353 Goose Lane
Carbondale, CO 81623
Re: Aspen-Glenn Duplex D-38
Mr. Waaraniemi:
This letter is intended to clarify the footing size at all party-walls in the above reverenced
project. The party-wall concrete footings should be a minimum 8" wider than the
supporting concrete stem wall. Therefore, the 1 '-2 1h " party-wall stem-wall should have a
minimum 1 '-10 Yi'' concrete footing under it. This footing should be 12" deep with (3)-
#4 bars running continuous at 3" from grade.
Please let me know if you have any additional questions.
Sincerely,
David Fulton
Senior Associate
Reviewed and approvidc by
Patrick Bird, P.E./S.E.
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