Correspondence 4410
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Monday, August 25, 2003 'Z O ON
William Y. & Nina K. Matsumoto
6,1 10856 SW Kable St. c�
Tigard, OR 97224
RE: Retaining Walls on Lot #2, Erickson Heights II, 10856 SW Kable St., Tigard.
This confirms that we received this morning a copy of a report dated Friday, August 22, 2003,
from GeoPacific Engineering titled "Summary of.Geotechnical Observation of Rockery Wall
Reconstruction and Pin Pile Placement, Lots 2, 3, and 8 - Erickson Heights, Tigard, Oregon."
The report discusses the removal of the lowest original retaining wall on Lot #2, its
replacement with an engineered wall approximately 8 feet high, and the removal or burial of
most of the two middle original walls. The report concludes that "based on our observations,
the walls were reconstructed in general accordance with our design and recommendations."
That design was spelled out in GeoPacific's May 27, 2003 report. Based on this final
assessment and acce e-by - the design engineer, we have issued a final approval of those
walls under p mil SIT2002- 00028. �\
The retaining walls -in- question have now been brought in under permit with corrections made
to them to the satisfaction of the responsible geotechnical engineer. Accordingly, the City
considers the walls to now be in compliance with the requirements of the Oregon One and Two
Family Dwelling Specialty Code.
For your files, I have included a copy of the GeoPacific report.
Thank you for your patience and your cooperation in resolving the issues pertaining to the
walls on this lot. Please let me know if you have any questions.
Sincerel
-
Albert Shields
Building Codes Enforcement Officer
cc: Randy Sebastian, Renaissance Development; Curtis Heintz, Curtis Heintz Excavation; Jim
Imbrie, GeoPacific Engineering; Jack Hoffman, Esq.; Property File.
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
08/25/2003 10:38 FAX 503 224 7324 DUNN CARNEY II003 /005
. GeoP
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; EnE hie.
arid Geotechnical Solutions
Investigation • Design • Construction Support
August 22, 2003
Project No. 03 -8207 � ` RECEIVED
Renaissance Homes, Inc.
W p v AUG 2 5 2003
1672 Willamette Falls Drive V
V CITY OF TIGARD
West Linn, OR 97068 BUILDING DIVISION
Fax (503) 656 -1601
SUBJECT: SUMMARY OF GEOTECHNICAL OBSERVATION OF ROCKERY WALL
RECONSTRUCTION AND PIN PILE PLACEMENT
LOTS 2, 3, AND 8 - ERICKSON HEIGHTS
TIGARD, OREGON
References: 1) GeoPacific Engineering Inc., Rock Walls and Slope Evaluation, Lot 3, Erickson Heights,
May 27, 2003.
2) GeoPacific Engineering Inc., Rock Walls and Slope Evaluation. Lot 8, Erickson Heights,
May 30, 2003.
3) Patrick B. Kelly Consulting Engineer, Summary of Findings from a Geotechnical Study of
the Lot 3. Swimming Pool at 10832 SW Kable Street, July 10, 2003.
This brief letter is to verify that GeoPacific has inspected the reconstruction of the lower rockery
walls on Lots 2 and 3 and pipe pile emplacement on Lot 8 at Erickson Heights In Tigard, Oregon.
The above Reference 1 presents our recommended design considered applicable to Lots 2 and 3
and Reference 2 presents our recommendations for lateral support of the uppermost and upper -
middle rockery walls on Lot 8 using 4 -Inch diameter pipe piles.
LOTS 2 AND 3:The lower rockery wall on Lots 2 and 3 was removed and constructed to a maximum
retained vertical height of approximately 8 feel on Lot 2 and 5 to B feet on Lot 3. Much of the upper
middle and all of the lower - middle wall on Lot 2 was removed/or burled. Where the wail on Lot 3 is
less than 7 feet tall, the new lower wall alignment is farther downslope and more than 6 feet
horizontal of rook fill was placed behind the wall even though only 3 feet horizontal was considered
necessary from the original design on the south facing portion of the reconstructed wall; therefore
the extra width at rock backfill on this wall Is considered to more than offset the reduced wall height,
from a slope stability perspective.
Approximately 6 feet horizontal of rock backfill consisting of 4a -0 and reject rock was placed and
compacted behind the newly constructed lower walls on Lots 2 and 3. Density tests on the reject
rock placed behind the wall on Lot 2 are attached.
The walls were inspected for materials used, subgrade bearing. keyway, and general conformance
with our design. Based on our observations, the walls were reconstructed in general accordance
with our design and recommendations.
LOT 8: Below the uppermost and upper - middle row of four tiers of rockery walls on Lot 8,
approximately fifty- eight, 15 foot long, 4 -inch diameter pipe plies were driven using a Movax SP40
7312 SW Durham Road Tel (503) 6534445
Portland, Oregon 97224 Fax (503) 598 -0706
d SOLE- ass_ £OS I 4 � utaaeuT2u3 oi4tvedoe9 1.4dLi:2 E002 ae 2n61
G•8/25/2003 10:39 FAX 503 224 7324 DUNN CARNEY a004/005
e GEOPACIFIC ENGINEERING, INC.
Project No. 03.8207
Lot S - Erickson Heights Rook Walls
(4,000 lb) vibratory hammer attached to a trackhoe. The pipe piles were slightly battered (angled) in
the downslope direction and the lower row of pipes were lagged with pressure - treated board and
backfilled with concrete to the lower face of the boulders. Pile installation was observed by our
representative. The first 3 to 7 feet drove with little resistance; therefore the plies were lengthened
to feet from the original design of 10 feet. In our opinion, the pipe pile placement was
constructed in general accordance with our design.
ADDITIONAL COMMENTS: The homeowner on Lot 4 requested that we revisit her walls to observe
groundwater seepage in the slope. Upon our visit, we did observe some water at the base of the
keyway on the lower wall, but it appeared to be corning from the neighbor's irrigation system and not
a natural spring.
We have also reviewed the report by Patrick B. Kelly Associates (Reference 3 above). Mr. Kelly's
work was to focus on the soil support beneath and around the swimming pool on Lot 3. Evaluation
of swimming pool support was not a part of our work scope. At the City of Tigard's request, we
have been asked to comment on the likelihood of filling after November 1999 around the pool. One
of Mr. Kelly's conclusions Is that vegetation present in a photograph proved it unlikely that additional
filling was performed after original development grading. Based on our discussions with Curtis
Hientz, on the proposed grading per Harris McMonagle's plan, and on our understanding of why the
rockery walls and terraced pool area were constructed specifically for the pool, it seems . unlikely that
there was no additional filling in the pool shortly before of home and pool construction in the fall of
2000..
LIMITATIONS: The homeowners should be aware that severely uncontrolled and concentrated
runoff, leaking water pipes, or other sources of potential localized slope saturation may reduce
portions the wall Factor -of- Safety and could cause movement of any type of retaining wall. Some
minor soil deformations may occur around the newly placed walls before the lateral soil forces are
transferred and resisted by the walls.
Within the limitations of scope, schedule and budget, GeoPacific attempted to execute our services
In accordance with generally accepted professional principles and practices in the fields of
geotechnical engineering and engineering geology at the time the report was prepared. No warranty
Is expressed or implied.
Sincerely,
GEOPACIFIC ENGINEERING, INC. ¢ co"
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ct 14743 \
OREGON
,
James D. Imbrie, P E. C.E.G. J4, s t�4,7
Principal C3eotechnical Engineer t) pee-
Attachment. Field Density Test Summary
Page 2
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08/25/2003 10:39 FAX 503 224 7324 DUNN CARNEY VI 005/005
summary 41 nem ,Jens1ty _Leas rage i or r
R
Summary of Field Soil Density Tests
Project: Erickson Heights Lots 14, 6 & 840
Job number OR 03 -8207
Client: Renaissance Development Summary Coding and Explanation
Date Test El e v GP. Max Field Dry Comp Comp Test
of Test location density moist density spec result
test number (ft) ( (%) (pcf) (To) ( %) status
Lot 2 Rockery wall fill
5/16/03 RWl above wall east exact +2 125,8 8.0 116.1 90 92 Passed
Rockery wall fin - - _ - - - -
5 /16 /03 RW2 Lot 2 above wall @ east end I � 125.8 7.9 115.4 90 92 ' Passed
Lot 2 Rockery wall fill 1 ME
5/16/03 RW3 +2 9.4 118.6 90 94 Passed
above wall @ west end
5/16/03 RW4
Lot 2 Rockery wall fill 125.8 &9 117.8 90 94 Passed
above wall @ west end
Go back to the task select pale Fos Eric on Heights Lots 1-4.6 & 8 - 10
Go back to dzgproject select.page
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http: //192. 168. 0, 1 /go opacific/admin/vievti►_soil , . suimnary.pl 8/22/2003
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December 31, 2002 L - "-"
FIB OPY CITY OF py MG A RD
Renaissance Homes, Inc. OREGON
1672 Willamette Falls Dr.
West Linn, OR 97068
Re: Rockery Wall Construction with Associated Fill
Dear Mr. Hunt,
The rock retaining walls and associated fill for Lots 2, 4 -6 & 8 -10 have been reviewed
and approved per the design by Carlson Geotechnical and your agreement with them to
monitor placement of the walls and the compaction of the soils on a continuous basis.
This agreement is a condition of approval of the plan review and is included as part of
• the permit document package.
Carlson Geotechnical shall submit daily field reports regarding drainage, wall base
compaction, drainage, fill compaction, and fill slopes. At the end of construction on each
lot, they must also submit a final summary report that verifies the compliance with their
design and the acceptance of all supported fill at each retaining wall. This will assure
the owners, developer and the City of Tigard that the terraced slope and its component
elements are now and will be stable in the future.
A City of Tigard Building Inspector will also make regular periodic visits once you have
commenced work. Please notify Albert Shields as you begin work on each lot. His
phone number. is 503 - 718 -2426.
The fees for these permits reflect only those pertaining to issuing each permit, and do
not include any investigation or penalty fees. This will be addressed under separate
cover by Albert Shields who does our uniform code enforcement.
It is important to note that there is still an open enforcement case at each of these lots,
and there will be no final approval by the City until those cases are resolved, and all fees
paid, lot by lot or en masse. 1�
Sincerely, /OSZ -C&
Darrel "Hap" Watkins -; G
Inspection Supervisor
J o (o
Cc Robert Wood, Renaissance Homes, Inc. t O 6 3/3
Albert Shields, Codes Enforcement Officer (�
Owners of individual properties 1 D‘ D
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
. / c 57,1,61Cc_
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Tuesday, November 05, 2002
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Robert D. Wbod,:VP df Can trete:4 h FILE COPY
Renaissance Properties
1672 SW Willamette Falls Dr.
West Linn, OR 97068
RE Erickson Heights II, Retaining Walls and Fill, Lots #2 -10.
Dear Robert:
Thank you for your cooperation in taking steps to resolve the issues concerning the rockery
retaining walls and fill on Lots #2 - 10 at Erickson Heights II. Permit applications and plans
regarding the subject walls and fill have been received by the City of Tigard. The lot
numbers, street addresses, and permit numbers are listed on the attached exhibit.
The City recognizes this submission as meeting the timeline requirement set forth in the
September 24, 2002 Notice of Violation letter sent to Renaissance but, as you know, the
application and plans do not resolve or propose corrections regarding the issues raised about
this site in that September 24 letter from the City, the September 17 report from Kleinfelder,
Inc., or the October 21' report from Carlson. We will accept these plans as a pro -forma
submission pending receipt of revised and updated plans upon which we will conduct a formal
plan review.
Please submit plans revised to address and correct the issues and concerns raised in the above
letter and reports.
We have not yet assigned a permit number to the application for lot #7, 10690 SW Kable. The
two rockery walls on that lot were included in the original plans for the subdivision. If
corrective work on those walls is required before the design engineer, Carlson, can verify the
adequacy of their construction and issue a final acceptance letter, please let us know and we
will issue a permit on this property. If Carlson is able to approve these walls as having been
constructed in accordance with their original plans and will issue a final acceptance letter on
them, specific for this lot, please forward that letter to us.
Please note that the City's September 24 letter provided 30 days for submission of the permit
applications and a total of 90 days or 60 days additional for completion of all corrections,
including plan review, construction, inspection, and approval. As of today, November 5 52
days remain of that 90 day period, which ends at close of business on Friday, December 27,
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
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2002. Plea §e nqte fuitj,er teat final inspection approval will require submission of a final
acceptance fetter rrom xhe'desigri etlg`mter(s).
Sincerely,
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Gary Lampella, Building Official
cc: Steve Hunt, Hap Watkins, Albert Shields
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ERICKSON JJEIGHTS II, I ET. ,INING WALLS AND FILL
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Lot No. Permit No. Street Address
2 SIT2002 -00028 10856 SW Kable St.
3 SIT2002 -00029 10832 SW Kable St.
4 SIT2002 -00030 10810 SW Kable St.
5 SIT2002 -00027 10788 SW Kable St.
6 SIT2002 -00031 10722 SW Kable St.
7 SIT2002 -000XX 10690 SW Kable St.
8 SIT2002 -00032 10652 SW Kable St.
9 SIT2002 -00033 10630 SW Kable St.
10 SIT2002 -00034 10600 SW Kable St.