HomeMy WebLinkAboutObservation of ExcavationI (+rt *ffififfifft:;llrlfd**
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
email : kaglenwood@kumarusa.com
www,kumarusg.com
An Emdoycc Orncd CamPcrnY
Office Locations: Denver (HQ), Parkel Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
September 18,2025
Dave Cardiff Construction
Attn: Dave Cardiff
506 Mesa Verde
Carbondale, Colorado 81623
daveca rd iffconstruction @q ma i L com
Project No. 21-7-643.4
Subject:Observation of Excavation, Proposed Residence, 382 River Bend Way, Lot 91,
lronbridge PUD, Phase 1, Garfield County, Colorado
Dear Dave:
As requested, a representative of Kumar & Associates, lnc. observed the excavation at the
subject site on September 17,2A25 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 Sepiember 8,2021, Project Na.21-7-643'
The proposed residence will be a two-story wood frame structure with a walkout lower level.
At the time of our visit to the site, the main part of the foundation excavation had been cut in one
levelfrom 2Yzto I feet below the adjacent ground surface. The upper {garage) level had not been
excavated. A pit had been dug adjacent to the upper level. The pit profile consisted of 5 feet of
clay overlying dense gravel soils. The soils exposed in the bottom of the lower excavation
consisted of relatively dense, slightly silty sandy gravel with cobbles. 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 placed on the gravel soils and designed for
the recommended allowable bearing pressure ol 2,5AA psf. Existin g clay soils and any loose and
disturbed soils should be removed in the footing areas to expose the undisturbed natural gravel
soils. Structural fill placed below proposed footing grade should consist of T+-inch road base and
be compacted to at least 98% of the maximum standard Proctor density. 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
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. lf the client is concerned about MOBC, then a professional in
this special field of practice should be consulted.
Dave Cardiff Construction
September 22,2025
lf you have any questions or need further assistance, please call our office
Sincerely,
Kumar & Associates,
Daniel E. Hardin, P
Rev. by: RLD
DEHlkac
Project No. 21-7-643.A
Page 2
24M3
?
Kumar & Associates, lnc.@