Report /� CedarvaNey Road
MAYES TESTING ENGINEERS, INC. Srite 110
Lynnwood, WA 98036
ph 425.742.9360
fax 425.745.1737
Tacoma Office
10029 S. Tacoma Way
August 10, 2011 Suite E-2
Tacoma, WA 98499
ph 253584.3720
City of Tigard fax 253584.3707
Rob Murchison Porthwrd Office
13125 SW Hall Blvd 7911 NE33rdDrive
Tigard, OR 5190
Rutland, OR 97211
ph 503281.7515
RE: FINAL SUMMARY REPORT fax 503281.75579
City of Tigard 10MG Reservoir Improvements and Pump Station
12475 SW Bull Mountain Road
Tigard, OR
Permit No.: BUP 2010 -00015
Project No. P10169
Gentlemen:
This is to certify that in accordance with Section 1701 of the State Building Code, we have
performed special inspection on the below listed items per our daily reports, copies of which have
been sent to you.
Reinforced Concrete
Adhesive Anchors
Structural Masonry
Screw Anchors
To the best of our knowledge all work inspected was performed in accordance with, or corrected to
conform to, the approved drawings or engineer approved changes and in conformance with the
applicable workmanship provisions of the State Building Code and Standards.
Respectfully,
MAYES TESTING ENGINEERS, INC.
Mark A. Galusha, P.E.
Branch Manager
Carlson Geotechnical Bend Office (541) 330 -9155 c� L So
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Eugene Office (541) 345 -0289 L 011/Tii
A Division of Carlson Testing, Inc. Salem Office (503) 589 -1252 GEOTECHNICAL
Phone: (503) 601 -8250 Tigard Office (503) 684 -3460
Fax: (503) 601 -8254
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Final Summary Letter
August 11, 2011
James W. Fowler Company
P.O. Box 489
Dallas, Oregon 97338
Final Summary Letter of
Geotechnical Construction Observation Services
SW 125th Avenue Improvements
SW 125th Avenue & SW Bull Mountain Road
Tigard, Oregon
CGT Project Number G1003490
Permit No.: Unavailable
INTRODUCTION
Carlson Geotechnical (CGT), a division of Carlson Testing, Inc. (CTI), provided geotechnical
consulting services during repair of a sewer line trench that had experienced on -going settlement
within SW 125 Avenue. In addition, our consulting services included observations and testing
during construction of the architectural wall near the south margin of the site. These services
were conducted on an on -call, part-time basis between May 3, 2010, and June 21, 2011. Our site
visits were scheduled by you.
At your request, CGT expanded our services to include third party observation /inspection services
during the installation of soil nails within the Pump and Vault Buildings. These services were
performed under the technical supervision of the Geotechnical Engineer -of- record for the soil nails
and these specific buildings, Geotechnical Resources, Inc. (GRI). GRI remains as Geotechnical
EoR for this portion of the project. These services were conducted on an on -call, part-time basis
between August 13, 2010, and November 1, 2010.
OBSERVATIONS
Copies of our field reports were forwarded to our client and members of the design and
construction team as the work progressed and are available in our office for your review. The
following is a summary of our observations and testing services:
• Architectural Wall Subgrade Soils: Based on our observations, the subgrade soils
prepared for the Architectural retaining wall at the south margin of the site were prepared in
general accordance with the project plans and the project geotechnical report.
Carlson Geotechnical • PO Box 23814, Tigard, Oregon 97281
SW 125th Avenue Improvements
Tigard, Oregon
CGT Project Number G1003490
August 11, 2011
• Structural Backfill: Based on our in -place density testing, the structural fill associated with
the architectural wall was placed and compacted in general accordance with our
recommendations.
• Sewer Trench Mitigation: As indicated in our field reports, the owner and construction
team elected to mitigate the soft utility trench backfill soils within SW 125 Avenue by
installing a reinforced granular mattress encompassing the trench backfill. This was
presented as one of three options for mitigating the soft trench backfill in our field report
dated May 3, 2010. The following summarizes our observations during construction of the
reinforced granular mattress at this part of the site:
o Subqrade Preparation. Based on our observations, the subgrades that we observed
within the granular mattress area were prepared in general accordance with our
recommendations.
o Geotextile Fabric & Geo -Grid Installation. Based on our observations, the geotextile
fabric and geo -grid reinforcement that we observed within the granular mattress area
were prepared in general accordance with our recommendations.
o Granular Mattress (Sub -base and Base Rock). Based on our observations, the granular
structural fill that we observed within the granular mattress area were prepared in
general accordance with our recommendations.
• Asphalt Pavement: Based on the results of our in -place density testing, the asphalt
evaluated within the SW 125 Avenue met required density.
• Soil Nails — Installation & Load Testing: Results of our observations during soil nail
installation and load testing were detailed in our field reports dated August 13, 2010,
through November 1, 2010. All observations and load test results were conveyed to the
Geotechnical Engineer -of- Record (EoR) for the soil nails, GRI.
Based on our observations, as documented in our field reports, and to the best of our knowledge,
within our scope of work, the above summaries accurately reflect our observations. Our services
were provided on an on -call, part-time basis, in which we relied on the contractor to contact our
office for the scheduling of our services. We cannot be held contractually responsible for those
items, if any, that we did not observe or test.
Should you have any questions regarding the recommendations or opinions presented in this
report, please contact us at (503) 601 -8250.
Carlson Geotechnical Page 2 of 3
SW 125th Avenue Improvements
Tigard, Oregon
CGT Project Number G1003490
August 11, 2011
Sincerely,
CARLSON GEOTECHNICAL
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K'le . Smetana, E.I.T. Brad M. Wilcox, P.E.
Geotechnical Project Manager Project Geotechnical Engineer
ksmetana a(.carlsontestinq.com bwilcox(a�carlsontestinq.com
Note: The observations of conditions at the times of our site visits were based solely on visual
methods. Our reports pertain to the locations observed at the times of our visits only. Information
contained herein is not to be reproduced, except in full, without prior authorization from this office.
The information contained in this report is provided subject to all terms and conditions of CGT's
General Conditions in effect at the time this report is prepared. No party other than those to whom
CGT has distributed this report shall be entitled to use or rely upon the information contained in this
document.
Distribution: James W. Fowler Construction, Dan Dean — Email: dand(a�iwfowler.com
James W. Fowler Construction, Mike MacMillan — Email: mikem a(�.iwfowler.com
James W. Fowler Construction, Tim Janesofsky — Email: timi a(�iwfowler.com
City of Tigard Public Works, Rob Murchison — Email: robm(a)tigard- or.gov
Murray Smith & Associates, Inc., Matt Hickey — Email: hickevmmsa-ep.com
Murray Smith & Associates, Inc., Daphne Marcyan — Email: marcyandmsa-ep.com
Ground Support, LLC, Chris Wolschlag — Email: chrisw(a)groundsupport.com
GRI, Scott Schlechter — Email: sschlechtergri.com
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Letter.doc
Carlson Geotechnical Page 3 of 3