HomeMy WebLinkAboutObservation of Excavationl(+AHi'r*f;ffi:*ff xnHr;--''
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5020 CountY Road 1-54
Glenrvood Splings, C(} 81601
phoner (970) 945'7988
fax: (970) 945-8454
email : kagl enwcod@kumamsa.com
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Office L$cations: llenver (IIQ), Parkeri iblorado Springs, Fort Coilins, Gleilwoorl Springs, and Surnmit {)ounty.Colorado
March 12,2025
Carson Ruonavaara
995 County Road229
Silt, Colorado 81652
earsgnrry((rloutlE)k.eory
Subject:
Project No. 22-7-501.A
Observation of Excavation, Proposed Residence, Lot74, Springridge Reserve,
285 Hidden Valley Drive, Garfield County, Colorado
Carson:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on March 13,2025 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 8, 2022,Project No. 22-7-501' The current
observation was performed in accordance with our agreement for professional services with you
dated March 6,2025.
The proposed residence is similar to that described in our previous study and has been designed
to be supported on spread footings sized for the recommended allowable bearing pressure of
1,500 psf.
At the tirne of our visit to the site, the foundation excavation had been cut in multiple levels from
about I to l0 feet below the adjacent ground surface with grade steps of I to 2 feet down to the
south and west between levels. The soils exposed in the bottom of the excavation mainly
consisted of silty clayey sand to sandy silty clay which transitioned to sandstone bedrock at the
deepest cut, northeast side. No free water was encountered in the excavation and the soils were
sliglrtly 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 1,500 psf. There could be some post-construction differential settlement in
soil bearing areas mainly from wetting and precautions should be taken to keep the bearing soils
dry. Loose and disturbed soils should be removed in the footing areas to expose the undisturbed
natural soils. The bearing soils should be protected from frost and concrete should not be placed
on frozen soils. other recommendations presented in our previous report which are applicable
should also be observed.
The recommendations submitted in this letter arebased on our observation of the soils exposed
within the foundation excavation and the previous subsurface exploration at the site. Variations
Carson Ruonavaara
March 12,2025
Page2
in the subsurface conditions below the excavation could incvease the risk of foundation
movement. We should be advised of any variations encountered in the excavation conditions
forpossible changes to recommendations contained in this letter. Our services do not include
detemrining 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,
Steven L. Pawlak,
SLPlkac
1 n?2o
Kumar & Associates, lnc. o Project No, 22-7-501.4