HomeMy WebLinkAboutObservation of ExcavationEngineeringo Inc.
CIVILiGEOTECHMCAL
April 5,2021
Brett Leable
Hammerhead Operations
727 Cotnty Road 120
Glenwood Springs, CO 81601
Brett@Hammerheadop s. corn
970-401-3743
RE: Open Hole Otlservation
Swimming Pool
2932 Coung Road 115
Glenwood Springs, CO 81601
Garfield County
Project No. 20-3418
Dear Brett:
At the request of Ryan Ivy, on February 4,9, and25,2020, we visited the consttuction site for the
in-ground swimming pool, on your property at2932 County Road 115, Glenwood Springs, CO 81601,
Garfield County, Colorado. The purpose of our site visits was to obsele the soils exposed in the
foundation excavations for the proposed in-ground swimming pool and compal'e them with the findings
and recommendations of the Soil's and Foundation Investigation, under the same project number, dated
Jdy 22.2020.
The excavation consisted ofone bench, about 30 feet long and 9.5 feet below the elevation ofthe
existing patio. The excavation was widened by five feet on the outside perimeter for the placernent of the
structural fill. The soil exposed in the bottom and sides of the foundation excavation consisted of reddish-
brown, clay with sparse gravel. Strucfural fiIl improved with Tensar Geogrid was constructed. The
structural fill consisted of an initial, 6-inch layer of minus 3-inch road base, covered with Triaxial Tensar
Geogrid followed by additional layers of a 12-inch layer of minus 3-inch road base and geogrid layers
until the desired elevation was achieved, which was total depth of 3 feet under most of the swimming
pool excavation with a thicker layer of structural fill on the westetn portion of the excavation. The final
layer of the structural fill was proof rolled. Soft spots were not observed or reported. The soil exposed in
the excqvation is suitable for the recommended bearing capacity of 2000 psf.
We recommend cornpliance with the recommendations of the above-named soil report during the
remainder of the construction, specifically with the sections on drainage, grading and irrigation. The
perimeter drain was constructed just below the top of the structural fill.
This report has been prepared according to locally accepted Professional Geotechnical
Engineering standards for similar methods of testing and soil conditions at this time. The findings and
recommendation stated above are based on the soil conditions observed in the cornpleted foundation
excavation only. We al'e not responsible for technical interpretation by others of the data presented in this
report. There is no other wananty either expressed or implied. If you have any questions, please do not
hesitate to call.
Sincerely,
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P.O. Box 724,Eagle CO 81631 Tel: 970-390-0307 www.LKPEngineering.com