HomeMy WebLinkAboutObservation of Excavation 09.15.2020I(-i{tffiffiffiffiff'il*"
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502û County Road 154
Glenwoocl Springs, C{f 81601
phone: (970) 945*7988
fax: {970) 945-8454
er:rai i : kaglenwood@kumarusa.com
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Ofiìce Lcc¿tions: Denver (I{Q), Parkei Colorado Springs, Fort Collins, Clenwoud Springs, and Summit Co¿urç Colorado
September 15,2OZA
Larry Mauldin
352 Dragonroot
New Castle, Colorado 81647
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Project No. 20-7-530
Subject:Observation of Excav¿tion, Froposed Residence, Lot 5" Rapids sn the Cotrorado,
TBD Rapids View Lane, Garfield County, Colorado
Dear Lany:
As requested, a r€pres€ntative of Kuurar & Associates, Inc. observed the excavation at the
subject site on September 14,2A20 to evaluate the soils exposed for foundation suppod. The
findings of our obseniations and recornmendations for the foundation design are presented in this
report. H-P Geotechnical (now Ku¡nar & Assosiates) previously arnducted a subsoil study for
design of foundations at the site and presented the {indings in a report dated March 31,2$A4,
JobNo. 1û3 198.
The proposed residence will be ¿ 1 to 2 story wood ftame structure wtth, a slab-on-grade ground
floor. We assume foundations were designed for the i,000 psf, as provided in the previous
subsoil study.
At the time of our visit to the site, the foundation excavation had been cut in one level about
3k feetbelow the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of loose to rnedium dense silty sand. The results of a percent finer than the No. 200
sieve gradation analysis indicate the sandy soil has 13% silt and a moisture content of 4.5%. No
free water wâs encountered in the excavation and the soils were slightly 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 1,000 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. Other recomrnendations 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
movement. We should be advised of any variations encountered in the excavation conditions ft¡r
Larry Mauldin
September 1.5,2020
Page2
possible changes to recommendations contained in this ietter. Our services do not include
determining the presence, prevention or possibility of mold or other biological contaminants
(MOBC) developing in the futr¡re. 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,
Kum¡r & Associates, Inc,
Daniel E. Hardin, P
DEH/kac
cc: BradJordan
Kumar & AssociatEs, lne. o Project No.20.7.530