Correspondence (511) 1. From 09/07/2007 15:44 #010 P.006 /011
09/06/2007 09:25 FAX GEODESIGN 7,n2 1p2 — o(21) r� 002
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September 6, 2007
Pacific Northwest Properties y
P.O. Box 2206
Beaverton, OR 97075
Attention: Mr. Paul Gram
Letter of Compliance
Geotechnical Engineering Construction
Tigard Triangle Commons, Building 1
Tigard, Oregon
GeoDesign Project: PNWP -30-05
Permit No. BUP- 200600206
This letter provides GeoDesign, Inc.'s summary comments on the geotechnical construction
observation services completed for Building 1 at the Tigard Triangle Commons project in Tigard,
Oregon. We previously completed a geotechnical evaluation of the site. Our study was
performed in two phases, with the results provided in our September 28, 2001' and July 19,
2005 reports.
GeoDesign observed the mass grading operations, which included site cuts and fills and retaining
wall (building stem walls) construction. We observed all foundation and floor slab subgrades
prior to concrete placement. Crushed rock material for floor slab support, utility trench and
• retaining wall backfill were evaluated by completing in -place density testing. ACS Testing, Inc.
performed an evaluation of the parking lot subgrade and aggregate base rock by proofrolling
• with a loaded dump truck. They also evaluated asphalt compaction for the parking lot. Based on
field reports provided to our office, the subgrade, aggregate base rock and asphalt compaction
for the parking lot were prepared in accordance with project specifications.
Members of our geotechnical staff observed geotechnical - related tasks identified above on a part-
time and on -call basis. The results of our site visits were summarized in daily field reports, which
have been provided to the design and construction team members. Areas where test results
indicated inadequate relative compaction were reworked and re- compacted until the specified
' Geotechnlcal Engineering Services, Bradford Office Building, Tigard, Oregon, dated September 28.2001, GeoDesign
Project PNWP -30-01
z Report of Geotechnicol Engineering Services, Tigard Triangle Commons, Tigard, Oregon, dated July 19, 2005, GeoDesign
• Project PNWP -30.02
; From: 09/07/2007 15:44 #010 P.007/011
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compaction was achieved. Within the limits of work observed and reported during the requested
site visits, the above- referenced tasks were completed in general accordance with the plans and
specifications and the geotechnical recommendations.
000
We appreciate the opportunity to work with you on this project. Please call if you have questions
concerning the information provided.
Sincerely,
GeoDesign, Inc. 44v*1Pti,
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Ls toff McDevitt, P.E
Project Engineer • .P y 11; 4:. C17/ P 411 •'
. EXPIRES: "1131 j0&
George .. "-' ers, RE, G.E.
Principa Engineer
cc: Mr. Randy Peterson, P &C Construction (via fax only) .
SPM:GPS:kes
Two copies submitted
Docurnent ID: PNWP -30-05 -090607- geoloc-BLD1.doc
@ 2007 GeoDesign, Inc All rights reserved.
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