HomeMy WebLinkAboutObservation of Excavation 08.06.2019K-Fit
Kum A Asseciess. Inc.
Gent/admiral and Materials Engineers
and Enviranraanlal Scientists
An Employee Owned Company
502e c r€raty iZoaa 154
Glen ooci prr , CO 81 601
phone: (9 r ()) 945-7988
fax: (9370} 94 5-8454
kag t r clt d@kumarusa.com
w> ;z,.k,raarusa.con
Office Locations: DKuver (HQ), Parker, Colorado Springs, Con Collins, Glenwood Springs, and. Sorntnit County, Colorado
August 6, 2019
Domoplex, LLC
Attn: Slawek Wojciuch
2550 Highway 82
Unit 108A
Glenwood Springs, Colorado 81601
sla wek@do mops ex. com
Subject:
Gentlemen:
Project No. 19-7-465
Observation of Excavation, Proposed Residence, Lot 45, Four Mile Ranch, 136
Maroon Drive, Garfield County, Colorado
As requested, a representative of Ktunar & Associates, Inc. observed the excavation at the
subject site on August 1, 2019 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 September 29, 2006, Job No. 106 0745.
At the time of our visit to the site, the foundation excavation had been cut in 3 levels up to 7 feet
below the adjacent ground surface. The soils exposed in the bottom of the excavation consisted
of very stiff, silty clay in most of the excavation with stiff, sandy clay exposed in the area of the
slab -on -grade garage. Results of swell -consolidation testing performed on samples taken from
the site, shown on Figure 1, indicate the soils are slightly compressible under conditions of
loading and possess a minor swell potential when wetted. No free water was encountered in the
excavation and the soils were slightly moist to moist.
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 2,000 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. 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 of foundation
movement. We should be advised of any variations encountered in the excavation conditions for
Domoplex, LLC
August 6, 2019
Page 2
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,
Kumar & Associates, Inc.
James H. Parsons, E.L
Reviewed by:
24443 •;—_
Daniel E. Hardin, P • s'A Q •1='
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Attachment: Figure 1 - '44-nsolidation Test Results
Kumar & Associates, Inc. Project No. 19-7-465
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SAMPLE OF: Silty Clay
FROM: Footing Grade in Northwest Corner
WC = 9.4 %, DD = 115 pcf
EXPANSION UNDER CONSTANT
PRESSURE UPON WETTING
0 APPLIED PRESSURE — KSF 10 100
19-7-465
Kumar & Associates
SWELL —CONSOLIDATION TEST RESULT
Fig. 1