HomeMy WebLinkAboutB13-0242 REV1 soils report corrections requiredQ
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August 16, 2013 D
McCord Construction Q 2 ,'j Q1
Attn: Tom McCord
P. O. Box 4195
TOWN OF VAILEagle, Colorado 81631
1_'l,it;(,.,I;tl uc[itt;l ;, 1
Job No. 1 l 1 289B
Subject: Obscrvation of Excavation, Proposed Deck and Bathroom Additions to
Williams Residence, Lot 7, Block 1, Vail Village 151 Filing, 302 Mill
Creek Circle, Vail, Colorado
Dear Tom:
As requested, a representative of Hepworth-Pawlak Geoteclinical observed the
excavations at the subject site on August 14, 2013 to evaluate the soils exposed for
faundation support. Tlie findings ofour observations and recommendations for the
foundation design are presented in this report. The services were performed in
accordance with our agree nent for professional engineering services to McCord
Construction, dated August 14, 2013. We previously conducted a subsoil study for
design of foundations at the site and presented our findings in a report dated October 18,
2011, Job No. 11 t 289A.
A deck attached to the north side ofthe residence and a single story bathroom attached to
the west side ofthe residence are planned. The deck will be founded on isolated footing
pads and tlie bathroom addition founded on continuous spread footings. The footings
were sized using an allowable soil bearing pressure of 3,000 psf. Our subsoil study report
recoirunended an allowable soil bearing pressure of 2,500 psf for the foundation design.
At the time of our site visit, the foundation excavations for the three deck footing pads
and the batlu•ooin addition had each been cut in one level about 4 feet below the adjacent
ground surface. The soils exposed in the bottom of the excavatians consisted ofrelatively
dense, silty sandy-avel and cobbles with smat( boulders. "The results of a gradation
analysis performed on a sa nple ofthe natural coarse granular soils (minus 5.inch
fraction) obtained from the site are presented on Figure 1. No fi•ee water was encountered
in the excavations and the soils were slightly moist to moist.
The soil conditions exposed in the excavation are consistent with those previously
encountered on the site. It should be feasible to use an allowable soil bearing pressure of
3,000 psf to size the footings with some increased risk of settlement. The settlement
could be differential with respect to the existing building vhich should be considered in
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DIAMETER OF PARTICLES tN MIWMETERS
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FWE MEDrtIM CONLSE FINE COpFlSE
Gravel 57 Sand 29 % Silt and Clay 14 9b
Semple of: Siliy Sandy Gravel with Cobbles From: Bottom of Bathroom Additian Excavation
112ssa P I'1 GRADATION TEST RESULTS FIGURE 1HEPWORTHPAWLAKGEO7ECHNiCAL
McCord Construction
r'ugust 16, 2013
Page 2
the design. Loose and disturbed soils should be removed in the footing areas to expose
the undisturbed natural coarse granular soils. Other recommendations presented in our
previous report which are applicable s}lvuld also be observed.
The recommendations submitted in ttUs letter are based on our observation ofthe soils
exposed within the foundation excavations and the previous subsurface exploration at the
site. Variations in the subsurface conditions below the excavations 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. Ifthe client is
concerned about MOBC, then a protessional in this special field of practice should be
consulted.
If you have any questions or need fiu-ther assistance, please call our office.
Sincerely,
HEPWORTH— P WLAK GEOT CFjNICAL, iNC.
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David A. Young, P,n; 32•2i6 :
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attachment Figure 1, Gf tkS est Results
tob No. t 1 t 2s96
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