HomeMy WebLinkAboutObservation of Excavation 10.21.2021lc,IHrd;ffi,:Ëil**
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An Endoyr¡ Oqi,nod goreony
5020 County Roatl 154
Clenwootl Springs, CO 81601
phone: (970) 945-7988
lax: (970) 945-8454
email : kaglenwood@kurnarusa.com
wwwkumarusa..çg.rr
Ofifice l-ocations: Denver (HQ), Parker, Color¿do Springs, Fort Collins, Clenwood Springs, and Sunrnit County, Cìolorado
October 21,2021
Dan and Laurel Froedge
3355 Marble Terrace
Colorado Springs, Colorado 80906
daniel. froedge@hdrinc. com
Project No. I 7-7-462.01
Subject: Observation of Excavation, Proposed Residence, Lot74, Filing 7,Elk Springs,
1579 Elk Springs Drive, Garfield County, Colorado
Dan and Laurel:
As requested by Vance Hutchinson with Colorado Carpentry, a representative of Kumar &
Associates, Inc. observed the excavation at the subject site on October ll,202l 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 April 29,2021,
Project No. t 7-7-462.01.
The proposed residence is the same as that described in our previous report. Spread footings
placed on the basalt rock soils and sized for an allowable bearing pressure of 2,500 psf were
designed for the foundation support.
At the time of our visit to the site, the residence excavation had been cut in one main level from
2 to 5 feet below the adjacent ground surface and was all based on basalt rock soils. The garage
area was partly excavated and was cut down around 2 to 3 feet to the top of the basalt rock soils.
No free water was encountered in the excavation and the soils were slightly moist.
The basalt rock soils 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 2,500 psf. Loose disturbed soils should be removed in the footing areas to
expose the undisturbed natural basalt rock soils. The footings in the garage area can be designed
as frost free (less than the 3 feet frost depth) provided the footings are placed on the basalt rock
soils. The structural engineer should prove the appropriate details for the proposed footing depth
modification. 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 offoundation
movernent. We should be advised of any variations encountered in the excavation conditions for
Dan & Laurel Froedge
October 21,2OZl
Page2
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 cons¡lted.
Ifyou have any questions or need firrther assistance, please call our ofiñce.
Sincerely,
Kumar & Associates,
Steven L. Pawlak, P
Rev. by: DEH
SLP/kac
cc: VanceHutchinson(cocarpentrvfdmsn.com)
Kumar & Associates, lnc. 's Project No. 17.7.462.01