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September 30. 2013 � � � � � �
McCord Construction D
Attn: Tom McCord �'��"��
OCT 1 1 L�;�_�
P. O. Box 4195
Eagle, Colorado 81631 TOWN OF VAIL
iliccurcl�;u n�t i-uetic�n�ci!hutma i l.c����i�
Jab No. 1 1 1 289R
Subject: Observation of Excavation, Proposed Basement Addition to Williams
Residence, Lot 7, Block 1, Vail Village ls` Filing, 302 Mill Creek Circle,
Vail, Colorado
Dear Tom:
As requested, a representative of Hepwoith-Pawlak Geotechnical observed the excavation
at the subject site on September 25, 2013 to evaluate the soils exposed for foundation
suppoit. The findings ofour observations and recommendations for the foundation
design are presented in this report. The services were supplemental to agreement 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. 1 1 1 289A. We also
recently observed the foundation excavation for deck piers and bathroom addition to the
residence and submitted our findings in a report dated August 16, 2013, Job No. 1 1 1
289B
The basement addition will be supported on spread footings and have a slab-on-�•ade
floor. The footu�gs were sized using an allowable soil bearing pressure of 2,500 psf as
recoinmended.
At the time ofour site visit, the foundation excavation for the basement was complete
except for the northeast portion. The excavation had been cut in one level about 5%z to 6
feet below the existing spread footing elevation which was about 9 to 9Yz feet below
adjacent exterior ground surface. The soils exposed in the bottom of the excavation
consisted of relatively dense, sitty sandy gravel and cobbles with small boulders. No free
water was encountered 'u� the excavation and the soils were generally moist.
The soil conditions exposed in the excavation are consistent with those previously
encountered on the site and suitable to support an allowable soil bearing pressure of 2,500
psf. There could be some differential settlement with respect to the existing building
which should be considered in the design. Loose and disturbed soils should be removed
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McCord Construction
September 30, 201;
Page 2
in the footing areas to expose the undistui•bed natural coarse granular soils. 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.
If you have any questions or need further assistance, please call our office.
Sincerely,
HEPWORTH — P AI� �Oy�rIICAL, INC.
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