Correspondence (683) •
Geo *OEngineers
February 19, 2001
Continental Dirt Contractors, Inc. F t L E C 0 P Y
1340 "M" Street S.E., Suite D
Auburn, Washington 98002
Attention: John Harper
Summary Completion Report
Keystone and Rockery Retaining Structures
Lowe's Hardware
Tigard, Oregon
File No. 6804 - 002 -01
GeoEngineers has provided on -call geotechnical monitoring and testing services during
construction of the Keystone and rockery retaining structures at the Lowe's Hardware
development in Tigard, Oregon. This letter summarizes our observations and test results during
construction.
A GeoEngineers representative observed subgrade preparation for the Keystone wall in May
and June 2000. Subgrade preparation for the Keystone wall included removal of unsuitable
organic soils and fill placement to raise site grades. In -place density tests were performed on all
compacted fill using a nuclear densometer. Based on our observations and test results, the wall
subgrade was prepared in accordance with the project specifications.
A GeoEngineers representative observed fill placement and general construction for the
Keystone retaining wall between June 14, 2000 and July 19, 2000. Based on our observations,
the wall was constructed in general accordance with the project plans and specifications. In -place
density tests were performed on the reinforced fill between the geogrids. Based on the test
results, the reinforced fill was prepared in accordance with the project specifications.
GeoEngineers observed subgrade preparation and construction of the rockery walls in the
northeast and southeast corners of the site between July 17, 2000 and November 10, 2000. Areas
of the wall that did not meet project plans and specifications were repaired. Based on our
observations, the rockery walls have been constructed in accordance with the project plans and
specifications.
GeoEngineers' services have been limited to earthwork construction observation and fill
compaction testing. Verification of site grades is not within our scope and should be verified by
the project surveyor.
GeoEngineers, Inc. •
7504 SW Bridgeport Road
Portland, OR 97224
Telephone (503) 624 -9274
Fax (503) 620 -5940
Printed on recycled paper.
I
Continental Dirt Contractors, Inc.
February 19, 2001
Page 2
We trust that this information meets your current needs. Please call if you have any questions
or if you need more information.
Yours very truly,
GeoEngineers, Inc.
oulas R. Schwarm, P.E. •
Associate
DRS:mln
Document ID: 680400201CR.doc
cc: Bill Crocker
Lowe's Hardware
G e o E n g i n e e r s File No. 6804 - 002 -01 -2130