Correspondence 7070 SW Fir Loop, Suite 100
TM RIPPEY Tigard, Oregon .97223
/ 11SZIPC. CONSULTING ENGINEERS Phone: (503) 443 -3900 • .
(503) 443 -3700
August 16, 1999
City of Tigard
Attention: Bob Poskin
13125 SW Hall Boulevard
Tigard, Oregon 97223
Re: Medak Office Building
Project Number: 99020
Permit Number: 99 -00324
Dear Bob: •
The following is in response to building plan review dated July 30, 1999.
Site Work:
1. A geotechnical report is being provided by Geotechnical Resources, Inc., see
attached.
2. This item was discussed by you and Jack Medak and it is our understanding that it has
been resolved.
3. The required fire flow test is being provided by the mechanical engineer.
4. A building survey and plans have been provided to the fire department.
Energy Code:
1. The energy compliance forms are being completed by the mechanical engineer.
Fire and Life Safety:
1. A draft stop has been added per OSSC Section 708.3.1.2.2. See revised drawing
Sheets 2 of 4 and S2 of 2.
•
Medak Office Building
• Project Number: 99020
. Permit Number: 99 -00324
August 16, 1999
Page 2
2. Additional ventilation of the attic has been provided. See revised Sheet S2.
Structural:
1. The 3 1/8 x 12 glu -lam at the ridge is not required. This condition was revised to a
ridge board condition.
2. Per our discussion with you, truss drawings and calculations will be provided prior
to construction of the roof and will be reviewed by our office..
•
3. Drawing S2 is revised to show the correct edge nailing.
4. Detail 3/S2 has been added to Sheet S2. Regarding the 1/2" plywood nailed to the
bottom chord of the trusses, this was revised to blocking panels between the trusses
per Detail 6/S1. Also, the CMSTI14 strap is shown on Sheet S2 per.Keynote 3 and
on Detail 6/S 1.
Erosion Control:
1. Permit is to be provided by the civil. engineer.
If you have any further questions or require additional information, please do not hesitate to call.
Sincerely,
Cii212/CTCArt.-Snu.ci..
Ralph Turnbaugh, P.E.
Project Manager .` P '%
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Enclosures
MINION
cc: Jim Hine, Colamette Construction 20 ■■ NZ■
Jack Medak, Medak Realty � °M TUR
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. .. -.. • -
AUG -19 -99 08: FROM= Geotechnical Resources ID= 503E449034 PAGE 1/1
Geotechnical Resources Incorporated
Consulting Engineers, Geologists, a nd Environmental Scientists
August 16, 1999 xxuoutTirmtemaqmkutavtew
Medak Realty FILE copy 4029NE Sandy Boulevard
Portland, OR 97212
Attention: Jack Medak
SUBJECT REVIEW OF LIQUEFACTION POTENTIAL, KING CITY OFFICE BUILDING, 11725 SW
QUEEN ELI7ABETA DRIVE, KING CITY, OREGON
At your request, Geotechnical Resources, Inc. (GRI) has reviewed the potential for seismically induced liquefaction of
the soils beneath the above - referenced site. The purpose of this review is to meet the intent of the City of Tigard
Building Department's Building plan review process.
Based on a review of the available geologic information, we anticipate the site is mantled with soil of the Willamette
Silt Formation, which is underlain at relatively shallow depth by Columbia River Basalt. We anticipate the
groundwater level at this site will be found at depths that range from 10 to 15 R We also anticipate the groundwater
will approach the ground surface during periods of extended precipitation.
The Oregon Department of Geology and Mineral Industries (DOGAMI) produced a map entitled, "Relative
Earthquake Hazard Map of the Portland Metro Region, Clackamas, Multnomah, and Washington Counties, 1997." A
review of this map indicates that the risk of liquefaction is considered high, with a total of 20 ft most susceptible to
liquefaction. Assuming a conservative value of liquefaction- induced volumetric strain of 3 %, the resulting
liquefaction-induced total settlement would be on the order of 0.6 ft. In our opinion, differential settlement could
approach half the total settlement_ We anticipate the majority of these settlements will occur after the end of strong
shaking, allowing ample time for occupants to exit the structure. We recommend that you review these findings with
your structural engineer
This review is based entirely on work performed by others on nearby sites. It was the intent of this review to provide a
sense of magnitude of the probable liquefaction - induced settlement Significant limitations are inherent in a study of
this type and additional investigations must be conducted if a better understanding of the associated risk is desired.
Sincerely,
GEOTECHNICAL RESOURCES, INC.
PRRs
riG I
8230
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David D. Driscoll, P.E.
Principal
cc: Jim Hirte / Colamette Construction
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