HomeMy WebLinkAboutMiscellaneous Field Test & Inspection Report 2000-5-4
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,n~;lInformation
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Engineering . Consulting . Testing
May 4, 2000
Mr. Greg Larkin
River Valley Builders, Inc.
P.O. Box2041
Corvallis, Oregon 97339
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Subject:
Pad Completion Letter
Ambleside Meadows, Lot # 100
Springfield, Oregon
PSI File No. 722-00154
Dear Mr. Larkin:
Professional Service Industries, Inc. (PSI) has completed a house pad subgrade evaluation at the
above referenced lot. The foundation subgrade soils within the house pad area were visually
classified as silty clay. The house pad area was probed with a Y, 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 tests ranged from 30 to 34 percent. Based on
previous testing perfonned on the soil type, the moisture content test taken is acceptable for this
type of potentially expansive soil.
The contractor then placed approximately 4 to 8 inches of 3 inch open aggregate till and 2 to 4
inches of crushed aggregate, granular fill over the house pad area to achieve final grade and
compacted the material. A proofroll of the compacted granular fill was performed using a loaded
dump truck. Minimal deflection and rutting was observed within the house pad area at the time
of our site visit. The crusbed aggregate, granular fill visually appeared to be well compacted at
.the time of our site visit.
Additionally, we recommend that tinished 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 iil foundation excavations,
on floor slab areas, or on prepared sub grades of the construction area eithet during or after
construction. Undercut or excavated areas should be sloped toward one. comer to facilitate
removal of any collected rainwater, groundwater, or surface runoff.
Professional Service Industries, Inc.. 1D40A Shelley St.. Springfield, OR 97477. Phone 541n46.9649. Fax 541/746.7163
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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 significantly sloped away from the house building areas and surface drainage should be
collectcd 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 stann
sewer or approved disposal system (outlet). All areas of the crawl space should be graded 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 (],OOO 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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Brian Currier, E.IT
Staff Engineer
E)(PIRES: 6/30 B I
Troy Hull, P.E.
Project Engineer
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