HomeMy WebLinkAboutObservation of Excavation 12.05.18H-PryKUMAR 5020 County Road 154
Glenwood Springs, C0 81601
Phone: (970) 945-7988
Fax (970) 945-8454
Email : hpkglenwood@kumarusa.com
Geotechnical Engineering I Engineering Geology
Materials Testing I Environmental
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
Decernber 5,2018
Sanchez Drywall,Inc.
Attn: Lupe Sanchez
P.O. Box 209
Silt, Colorado 81652
lupessanchez@hotmail. com
Project No. 18-7-715
Subject:Observation of Excavation, Proposed Residence, Lot 15, Block 7, Battlement
Creek Village, 0410 Meadow Creek Drive, Garfield County, Colorado
Gentlemen:
As requested, a representative of H-PÆ(umar observed the excavation at the subject site on
November 29,2Ol8 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations for the foundation design are presented in this report.
Hepworth-Pawlak Geotechnical (now H-P/I(umar) previously conducted a subsoil study for
design of foundations at the site and presented our findings in a report dated January 16,2007,
Job No. 1061042. The current observation was conducted according to our agreement for
services with SanchezDrywall, dated November 28,2018.
The proposed residence will be similar to that described in the previous study report but will
have a structural floor above crawlspace and slab-on-grade in the gdrage. Spread footings placed
on the natural soils and sized for an allowable bearing pressure of 1,200 psf with a settlement
risk were designed for the foundation support.
At the time of our visit to the site, the foundation excavation had been cut in 6levels from I to 5
feet below the adjacent ground surface. The excavation was generally stepped down to the north
with the ground surface slope. The soils exposed in the bottom of the excavation consisted of
sandy to very sand silt. No free water was encountered in the excavation and the soils were
slightly moist. The excavation had been covered and was not frozen.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and can be used for support of spread footings designed for the recommended
allowable bearing pressure of 1,200 psf with a risk of differential settlement and building
distress. Loose disturbed soils in the footing areas should be moistened and compacted. The
bearing soils should be protected from frost and concrete should not be placed on frozen soils.
Other recoÍrmendations presented in our previous report which are applicable, especially those
to keep the bearing soils dry, including no perimeter foundatjon drain, should also be observed.
Sanchez Drywall, Inc.
December 5,2018
Page2
The recommendations submitted in this letter are based on our observation of the soils êxposed
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. If the client is concemed 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,
H*P*KUMAR
Steven L. Paw
SLP/kac
H-P=KUMAR Project No. 18-7-715