HomeMy WebLinkAboutSoils Report 06.12.13.pdfHEPWORTH -PAWLAK GEOTECHNICAL
June 12, 2013
Rick Blomquist
5 Cambria Road East
Palm Beach Gardens, Florida 33418
Subject:
Gentlemen:
Hepworth-l'awlak ()eon -clinical, Inc.
5020 Connry Road ( 54
Glcmvood Springs, Colorado 81601
Phone: 970-945-79&
Fox: 970-945-8454
email: hpge 4'hp,.» tech.corn
Job No. 112364A
Observation of Excavation, Proposed Residence, Lot C10, Aspen Glen,
540 Diamond A Ranch Road, Garfield County, Colorado
As requested by Ken Smith of Woodstone, Inc, a representative of Hepworth-Pawlak
Geotechnical, Inc. observed the excavation at the subject site on June 12, 2013 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 October 22, 2012, Job No. 112 364A.
The proposed residence is similar to that assumed in our previous report and will be
above crawlspace with slab -on -grade floor in the garage. Spread footings placed on the
natural gravel soils and sized for an allowable bearing pressure of 3,000 psf were
designed for the foundation support based on our previous study report.
At the time of our visit to the site, the foundation excavation had been cut in one level
from 11/2 to 31/2 feet below the adjacent ground surface. There was a soil island in the
garage area at the northeast portion. The soils exposed in the bottom of the excavation
consisted of relatively dense, clayey (in shallow cut areas) to slightly silty sandy gravel
and cobbles with scattered small boulders and localized slightly silty sand layers. No free
water was encountered in the excavation and the soils were slightly moist. The water
service line was being installed in the northwest corner 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 3,000 psf. Loose disturbed soils should be
moistened and compacted in the footing areas. The stockpiled on-site soils can be used a
structural backfill when the oversized rock (plus 3 to 5 -inch size depending on its use) has
been removed. 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
Parker 303-841-7119 • Colorado Springs 719-63.3-5562 • SiIverrhornc 970-468-1989
Rick Blomquist
June 12, 2013
Page 2
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 GEO NICAL, INC.
Steven L. Pawlak, P.E
SLP/ljg
cc: Woodstone, Inc — Attn: ' = math (ken(Mwoodstoneiuc. net)
Kurtz & Associates — Attn: Brian Kurtz (kurtzengineer@,yahoo.com)
Warren Palmer Architect (palmerarch n,gmail.com)
Joh No. 112 364A
Gtech