HomeMy WebLinkAboutObservation of Excavation 09.30.2019l{3rlmmmiffü'*
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5020 C.ounty Road 154
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phone: (970) 945-7988
fàx: (970) 945-8454
enraiI : kaglenrvood@kumarusa.com
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Of-lìce l-ocations: Denver (HQ), Parker, Color¿do Springs, I¡ort Collins, Clcnivood Springs, ancl Surnmit {lounty, Colorado
September 30,2019
J & M Construction
Attn: Marcus Renova & Sylvia Aguilar
200 West 20th Street, Trailer D6
Rifle, Colorado 81650
(sylviaaguilar2@aol.com)
Project No. 19-7-543
Subject:Observation of Excavation, Proposed Residence, Lot 4, Native Springs, 14 Native
Springs Drive, Garfield County, Colorado
Dear Marcus & Sylvia:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on September 16,2019 to evaluate the soils exposed for foundation support. The
findings of our observations and recommendations for the foundation design are presented in this
report. H-P Geotech (now Kumar & Associates) previously conducted a subsoil study for design
of foundations at the site and presented the findings in a report dated April 28,2016,Job No.
11ó 0984.
The proposed house will be two stories of wood frame construction over a crawlspace. The
attached garage will have a slab-on-grade floor. Foundations were designed for an allowable soil
bearing pressure of 1,200 psf as recommended in the previous subsoil study report with a risk of
foundation differential settlement.
At the time of our visit to the site, the foundation excavation had been cut in one level from 2 to
3 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of medium stiff, slightly clayey sand and silt. No free water was encountered in the
excavation and the soils were 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 allowabie
bearing pressure of 1,200 psf with the foundation settlement risk. Loose and disturbed soils
should be removed in the footing areas to expose the undisturbed natural soils. Other
recommendations presented in the 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
J & M Construction
September 30,2019
Page2
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 aprofessional in
this special field ofpractice should be consulted.
If you have any questions or need further assistance, please call our office.
Sinberely,
Kumar & Associates, Inc.
Daniel E. Hardin, P
Rev. by: SLP
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cc: Carlos ernpiredrywallinc@comcast.net
Kumar & Associates, lnc. o Project No. f9.7.543