HomeMy WebLinkAboutFile Documents.395 Thunderbowl Ln.0153.2017 (54).ARBK H-p Ku MAR 5020 County Road 154
ti 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 2, 2017
Aspen Extreme,LLC
400 North Michigan Avenue
Suite 900
Chicago, Illinois 60611 Project No. 17-7-734
Subject: Additional Geotechnical Recommendations For Expected Deeper Excavation Cut
Depths, 395 Thunderbowl Lane, Lot 7, Block A, Aspen Highlands Village,
Aspen, Colorado
Gentlemen:
As requested by Roger Hall of David Johnston Architects, we are providing additional
geotechnical recommendations based on the reported proposed excavation depths of up to 18
feet. H-P Geotech (now H-P Kumar) previously conducted a subsoil study for design of �� it
foundations at the site and presented the findings in a report dated June 8, 2016,Job No. 1 ,#
100A. 1/16/18
We understand that the proposed cut depths are 18+feet. The previous subsoil study anticipatedASPEN
cut depths of 8 to 12 feet. We expect that subsurface conditions will be similar to those BUILDING DEPARTMENT
previously encountered at the site. It is possible that harder rock and groundwater seepage
conditions could be encountered with depth.
In general, the previous soils report can be used for design and construction of the proposed
residence. Based on the deeper than expected excavation cut depths, we recommend that
foundation retaining walls taller than 12 feet be designed for a uniform lateral earth pressure in
psf of 23H, where H is the retaining wall height in feet. For example, for a 15 foot high
foundation retaining wall, the lateral earth pressure would be 345 psf for the entire retained
height of the wall. Other recommendations presented in our previous report which are applicable
should also be observed.
If you have any questions or need further assistance,please call our office.
Sincerely,
H-PiM -
KUAR c,c
•
24443 z;
Daniel E. Hardin,P.E.
DEH/kac ` SS'---
cc: David Johnston Architects—c Attn: Roger Hall roger@djarchitects.com