HomeMy WebLinkAboutMiscellaneous Correspondence 2000-7-13
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River Va11e~ Builders Inc 541 367 1638
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EngIneering. consuJt/ng . Testing
July 13, 2000
Mr. Greg Larkin
River Valley Builders, Inc.
P.O. Box 2041
Corvallis, Oregon 97339
Subject:
Pad Completion Letter
Amble.ide Meadows, Lot # 84
Sp,.jngfield, Oregon
PSI File No. 722-00154
Dear Mr. Larkin:
Professional Servicc Industries, Inc. (PSI) has completed a house pad subgrade evalualion at thc
above referenced lot. The foundation subgrade soils within the house pad area were visually
classified as brown, silty clay. The house pad area was probed with a ~ inch diameter soil probe
and apPeared fIrm at the time of our site visit. Moisture content tests were taken at various
locations throughout the house pad. The moisture contents rests ranged from 29 to 31 percent.
Based on previous testing perfonned on the soil type, the moisture content test taken is acceptable
for this type of potcntially cxpansivc soil.
The contractor then placed approximately 12 inches of 3 inch minus aggregate fill within the
north side of the lot and 4 inches of crushed aggregate, granular fill over the house pad area to
achieve final grade and compacted the material. A proofroU of the compacted granular fill was
performed using a loaded dump truck. No deflection was observed within the house pad area at
the time of our site visit The crushed aggregate, granular fill visually appeared to be well
compacted at the time of our site visit
Additionally, we recommend that finished grade adjacent to the exterior portion of the footings
and slabs be at least 2 feet higher than the expansive bearing soils. This is to provide a buffer
from environmental changes that could cause the expansive soils to dry and hydrate. It will be
imperative that the 2-foot buffer of landscape soil be compacted to a firm' condition to reduce the
infiltration of water at the surface.
During foundation construction, water should not be allowed to collect in foundation excavations,
on floor slab areas, or on prepared subgrades of the construction area either during or after
construction. Undercut or excavated areas should be sloped toward one corner to facilitate
removal of any collected rainwater, groundwater, or surface runoff.
Professional Service Indusfries. Inc. -1040A Shelley St.. Springfield, OR 974n. Phone 5411746.9649- Fax 541/746.7163
Au~ 04 00 10:46a
River Va11e~ Builders Inc 541 367 1638
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Ambleside Meadows
Lot #84
July 13.2000
Page 2 of2
Positive site drainage and foundation drains should be provided to reduce infiltration of surface
water around the perimeter of the house and beneath the floor slabs. The permanent grades
should be significanrly sloped away from the house building areas and surface drainage should be
collected and discharged such that water is not permitted to infiltrate the backfill and floor slab
areas of the residence.
All crawl spaces should be provided with a low-point crawl space drain 'connected to the storm
sewer or approved disposal system (outlet). All areas of the crawl space should be grado:d to
drain to the low-point drain. All crawl space areas should be covered with a visqueen moisture
barrier. The low-point drain should be lower than the elevation of the visqueen moisture barrier.
Based upon our observations, the house pad subgrade has been constructed in general accordance
with industry standards for lightly loaded (\,500 pounds per square foot or less) foundation loads
typical for this type of construction. If you have any questions regarding this report, please feel
free to contact us at 746-9649.
Respectfully Submitted,
PROFESSIONAL SERVICE INDUSTRIES, INC.
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1 EXl'IRES: 6~O ~.:.'.J
Brian Currier, E.!.T.
Staff Engineer
Troy Hull, P.E.
Project Engineer