HomeMy WebLinkAboutObservation of Excavation 5.8.12.pdfIIi:PWORTH . PAWLAK GEOTECHNICM. May 8,2012 Ken and Debbie Roberts P.O. Box 2466 Glenwood Springs, Colorado 81612 Job No. 111 054A Subject: Observation of Excavation, Proposed Residence,
Lot GV-7, Filing 2, Aspen Glen, Bald Eagle Way, Garfield County, Colorado Dear Mr. and Mrs. Roberts: As requested by Ken Melby, a representative of Hepworth-Pawlak Geotechnical, Inc.
observed the excavation at the subject site on May 7, 2012 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 April 12, 2011, Job No.
III 054A. The residence is designed for spread footings placed on the natural, dense granular soils and sized for an allowable bearing pressure of 3,000 pst: The residence foundation
will initially be built and followed by the garage. At the time of our visit to the site, the foundation excavation for the residence area had been cut in one level fi'om about 4 to
10 feet below the adjacent ground surface. The downhill, east end was being excavated down in the patio area. The soils exposed in the bottom of the basement area excavation consisted
of relatively dense, sandy gravel and cobbles. No fi'ee water was encountered in the excavation and the soils were slightly moist to moist. The granular soils exposed in the excavation
are consistent with those previously encountered on the site and suitable for SUppOlt of spread footings designed for the reconunended allowable bearing pressure of 3,000 pst: Loose
disturbed soils should be removed in the footing areas to expose the undisturbed natural soils. A foundation drain is recommended to prevent potential hydrostatic loading on basement
walls that include the north, west and south sides. The subdrain can daylight to the east or discharge into the natural gravel soils. Other recommendations presented in our previous
report which are applicable should also be observed. The reconU11endations submitted in this letter are based on our observation ofthe soils exposed within the foundation excavation
and the previous subsurface exploration at the
Ken and Debbie Roberts May 8, 2012 Page 2 site. V ariat ions 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. lfthe client is conccrned about MOBC, then a professional in this special field of practice should
be consulted. lfyou have any questions or need further assistance, please call our office. Sinccrely, HEPWORTH -PA WLAK ~~~~ Steven L. Pawlak, P SLP/ksw cc: KLM Construction (k:lmdJ,yctQPJ).,cn!i£{~m
t!Jlck.Y)m) KUltz and Associates -Attn: Brian KlUtz, PE Job No. III 054A ~ech
