HomeMy WebLinkAboutObservation of Excavation H-P- „KU mAR5020 County Road 154
Glenwood Springs, CO 81601
Geotechnical Engineering I Engineering Geology Phone: (970)945-7988
Materials Testing I Environmental Fax: (970)945-8454
Email: hpkglenwood@kumarusa.com
Office Locations: Denver(HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
October 1, 2018
West Lupine, LLC
Attn: Rich Laws
8931 East Wesley Avenue
Vail, Colorado 80231
rlaws@liveberkely.com
Project No. 18-7-315
Subject: Observation of Excavation, Proposed Duplex Residence, Lot 7 Bighorn
Subdivision, 3796 Lupine Drive, Vail Colorado
Dear Rich,
As requested, a representative of H-P/Kumar observed the excavation at the subject site on
September 26, 2018 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations for the foundation design are presented in this report. The
services were performed in accordance with our agreement for professional engineering services
to West Lupine, LLC, dated May 2, 2018.
Previous subsoil studies have been performed at the lot by Hepworth-Pawlak Geotechnical (now
H-P/Kumar). The studies include a subsoil study for foundation design dated July 10, 2008 and
a supplemental subsoil study for foundation design dated August 1, 2008,Job No. 408 200A.
We have also been provided a geologic hazards evaluation for the subject Lot 7 by Ninyo &
Moore dated May 18, 2018, Project No. 501489001.
At the time of our visit to the site, the foundation excavation had been cut in 2 levels from 5 to
13 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of about 5 feet of relatively dense, man-placed sand and gravel structural fill. The
compressible sand and silt soils appear to have been removed from within the building footprint.
No free water was encountered in the excavation and the soils were slightly moist to moist. An
intercept drain had been installed around the uphill side of the excavation. No water was
observed flowing from the drain.
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 2,000 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. Any water seepage into the excavation should be
collected and diverted away from the footing areas and any softened soils and mud removed
West Lupine, LLC
October 1, 2018
Page 2
before concrete placement. 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. 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,
H-Pb KUMAR
dfmes H. Parsons, E.I.
Reviewed by: ����� ,
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Daniel E. Hardin, P. 24443 z;
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Cc: Greg Cummings 'an - ' '@.mail.com
H-P-AKUMAR
Project No. 18-7-315