HomeMy WebLinkAboutB15-0197_B15-0197 Geotech Report_1445462400.pdfHEPWORTH· PAWLAK GEOTECHNICAL
October 2, 2015
Ashton-Hirst Construction, Inc.
Attn: Phill Hirst
P.O. Box 5102
Frisco, Colorado 80443
ashtonhirstconstruction@gmail.com
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Job No. 114 438A
Subject: Observation of Excavation, Proposed East Addition, 4193 Spruce Way,
Lot 12, Block 9, Bighorn Subdivision Third Filing, Vail, Colorado
Gentlemen:
As requested, a representative of Hepworth-Pawlak Geotechnical, Inc. observed the
excavation at the subject site on September 29, 2015 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 observed a distressed
retaining wall at the site and presented our findings in a report dated October 22, 2014,
Job No. 114 438A. The current observation was conducted in addition to and in
accordance with our agreement for services with Ashton-Hirst Construction dated
October 7, 2014.
The addition will be attached to the east end of the existing residence. Spread footings
placed on the natural granular soils and sized for an assumed allowable bearing pressure
of 2,500 psf were designed for the foundation support.
At the time of our visit to the site, the foundation excavation had been cut in 2 levels from
3 to 10 feet below the adjacent ground surface. The soils exposed in the bottom of the
excavation consisted of silty sandy gravel with cobbles. The footing forms were in-place
and the existing footings were exposed at the southwest corner of the addition. The
results of a gradation analysis performed on a sample of the natural gravel (minus 3 inch
fraction) obtained from the site are presented on Figure 1. No free water was encountered
in the excavation and the soils were slightly moist to moist.
The soil conditions exposed in the excavation appear consistent with those expected on
the site and suitable for support of spread footings designed for the assumed allowable
bearing pressure of 2,500 psf. Loose disturbed soils in the footing areas should be
moistened and compacted. 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 limited observation at the site.
Parker 303-841~7119 • Colorado Srrings 719 633 5562 • S1lverrhome 970-468-1989
Ashton-Hirst Construction. Inc.
October 2, 2015
Page2
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.
Steven L. Pawlak, P.E.
SLP/ksw
Attachment:
Job No .. 114 438A
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HYDROMETER ANALYSIS SIEVE ANALYSIS
I TIME READINGS I 24 HR 7HR US STANDARD SERIES I
O 45 MIN 15 MIN 60MIN19MIN 4 MIN. 1 MIN #200 #100 #50 #30 #16 #8 #4
10
20
30
40
50
60
70
80
90
100
.001 .002 .005 009 019
ClAYlOSil.T
GRAVEL 55 %
.
037 074 150 300 600 118 2 36 4 75
DIAMETER OF PARTICLES IN MILLIMETERS
I FltE I ~ I COAASE I
SANO 35 %
CLEAR SQUARE OPENINGS I
3/8' 314· 1 1/'Z' 3' 5' ll 8' 100
.
.
.
9 5 190 37 5
12 5
76.2 152 203
127
GR.Al/El I n;nro ES
FltE I ~ .
SILT ANO CLAY 10 %
90
80
70
60
50
40
30
20
10
0
LIQUID LIMIT % PLASTICITY INDEX %
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SAMPLE OF: Silty Sandy Gravel FROM: Bottom of Excavation-East Addition, 9/25/15
114 438A ~ GRADATION TEST RESULTS Figure 1
Hepworth-Pawlak Geotedmlc:al
10/9/2015 Gmail -Spruce Way residence
Phillip Ashton-Hirst <ashtonhirstconstruction@gmail.com>
Spruce Way residence
1 message
Hannes Spaeh <hspaeh@monroe-newell.com>
To: "ashtonhirstconstruction@gmail.com" <ashtonhirstconstruction@gmail.com>
Cc: Catherine Ashton-Hirst <Catherine@ashtonhirstarchitecture.com>
Tue, Sep 29, 2015 at 1 :00 PM
Phil: I have reviewed the form system you want to use. Nudura is structurally acceptable. The icf series is ok
and the one series may work well where ledgers are to be connected to the walls.
Thank you,
Hannes Spaeh, P .E.
Monroe & Newell Engineers, Inc.
ph: 970-949-7768
https://mail.google.com/mail/u/O/?ui=2&ik=9b93037d07&view=pt&search=inbox&th=1501a79fee0034e9&siml=1501a79fee0034e9 1/1