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HEPWORTH-PAWLAK GEOTECHNICAL
May 13, 2015
Kelly West
2410 Howard Drive
Rifle, Colorado 81650
lilaulicldscrviccs@umnil.com
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Job No . 1 t 5 056A
Subject: Observation of Excavation, Proposed Residence, Lot 25, Sun Meadow
Estates, South Meadow Drive, Garfield County, Colorado
Gentlemen:
As requested, a representative of Hepworth-Pawlak Geotechnical, Inc. observed the
excavation at the subject site on May 11, 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 March 9,
2015, Job No. 115 056A.
The proposed residence is essential I y the same as that described in our previous report.
Spread footings placed on the natural soils and sized for an allowable bearing pressure of
1,500 psfwere designed for the foundation support. The residence area will be above
crawlspace and the garage will have a slab-on-grade floor.
At the time of our visit to the site, the foundation excavation had been cut in one level
from 2 to 4 feet below the adjacent ground surface. The soils exposed in the bottom of
the excavation consisted of silty sandy clay. Results of swell -consolidation testing
performed on a sample taken from the site, shown on Figure 1, indicate the soils have low
to moderate compressibility potential under conditions ofloading and wetting. No free
water was encountered in the excavation and the soils were slightly moist to moist. The
perimeter footings and interior pads had been formed at the time of our site visit.
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 1,500 psf. Loose disturbed soils in the
footing areas should be moistened and compacted or removed to expose the undisturbed
natural soils. Other recommendations presented in our previous report which are
applicable, especially those to keep the bearing soils dry, 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
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KeJlyWest
May 13, 2015
Page2
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
Jetter. Our services do not include determining the presence, prevention or possibiJity of
mold or other biological contaminants (MOBC) developing in the future. lfthe client is
concerned about MOBC, then a professional in this special field of pr actice should be
consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
HEPWORTH -PAWLAK GEOTECHNICAL, INC.
SLP/ksw
Attachment:
Job No. II S OS6A
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