Correspondence •
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CONSULTING�-
ENGINEERS
11 August 1995
Tim R. Froelich, P E
Principal
Faramarz Dindar- AzimT, P.E Ms. Janette Herman
Associate Northwest Landscape Industries
Steven J Entenman, PE 16075 SW Upper Boones Ferry Road
Associate
Douglas B. Schwarz, P E Tigard, OR 97224
Associate
Corina Mann RE: Structural Review of the 12' x 56' Modular Jobsite Office (circa 1983)
Design Engineer 16075 SW Upper Boones Ferry Road
Aaron Johnson
CADD
LuAnn Hawley
Office Manager Dear Ms. Herman:
Further to your request, we have completed our review of the pre - manufactured building
used as a mobile jobsite office located in the yard at NW Landscape Industries. It is our
understanding that there are no existing drawings or other documentation.
We visited the structure twice, as you know, to gather the appropriate information needed
to complete our structural review. We have included in this letter report, a description of
the basic structural systems, a synopsis of our review findings and a basic conclusion
statement regarding the mobile office building.
We base all our comments in this letter report on our site observations. Our structural
review was founded on the following criteria:
Roof Live Load = 25 psf
Floor Live Load = 50 psf
Wind Velocity = 80 mph, Exposure B
1 Seismic Zone = 3
CALIFORNIA OBSERVATIONS
1990 The Alameda
San Jose, California 95120
408 985 -1848 The existing mobile office structure is a 12' wide x 56' long pre - manufactured building.
Tr z designation on the unit includes a VIN 30R5OFMIC27N, with a Commercial Coach
CENTRAL OREGON
141 SE 3rd marking. -
Bend, Oregon 97709 -
503 383 -1828
Basic wood frame construction (2 x 4 studs at 16" o /c) was used for the wall framing.
MAIN OFFICE Plywood sheathing was installed at the exterior walls and roof. Roof framing was noted to
L O 325 s we BoonOes regon Ferl Road
97035 be pre - fabricated trusses at 16" o/c and directly align with the studs in the sidewalls below.
FAX 503 630 -068 Typical metal siding and roof panels clad the exterior. See Figure 1 included at the end of
this letter report.
The floor framing system includes two main stringers running the length of the structure
that are supported by CMU blocks at 8 feet center to center. Three holddown bands and
screw anchors are located along each stringer to stabilize the structure for lateral loading.
Floor joists span from stringer to stringer supporting the plywood floor decking.
SYNOPSIS OF OUR REVIEW FINDINGS AND CONCLUSION
A gravity load and lateral load analysis was performed on the office structure based on the
above mentioned design criteria. Our finding indicate the existing structure to be adequate
for the use for which it is intended. Refer to the structural calculations included at the end
of this letter report.
The roof is framed with light roof trusses typical in residential construction excepting for
the chords were noted to be 2 x 2 members. We did not have the opportunity to survey all
the connections, members, and details required to analyze the truss design which was
outside the scope of our review. It is our understanding that the structure has been in use
for at least 12 years and has been loaded with typical snow loads during that time. We did
not observe any evidence of structural distress from under- design or over -load. On that
basis, it is our opinion that the existing roof framing is adequate and will continue to be
satisfactory for the useful life of the structure.
As noted above, we have found the structure of the building to be satisfactory for the
design required by the current Uniform Building Code. We foresee that the building
structure will continue to perform as intended.
We trust that the information and continent included herein is satisfactory for your present
needs. If you have any questions or if we can be of additional service, please do not
hesitate to contact our office.
Very truly yours,
FROELICH CONSULTING ENGINEERS
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-, RF & RES
October 29, 1993
Randy Russell Design
9200 S.E. Rodlun Road
Gresham, Oregon 97080
Re: Conference Room Addition
Northwest Landscaping
16075 S.W. Upper Boones Ferry Rd.
6290B- 056 -000
Gentlemen:
This is a Fire and Life Safety Plan Review and is based
on the 1991 editions of the Uniform Fire Code (UFC) and
those sections of the Uniform Building Code (UBC) and
Uniform Mechanical Code (UMC) specifically referencing
the fire department, and other local ordinances and
regulations.
Plans are conditionally approved subject to Tigard
Building Department requirements and the following
items:
1. The tenant space number must be prominently
displayed on the street front where it is readily
visible to drivers and officers of responding fire
apparatus and other emergency vehicles. UFC Sec.
10.208 .
2. Not less than one (1) approved fire
extinguisher(s) with a rating of not less than ( *)
shall be provided for each ( * *) square foot of
floor area or fraction thereof. The travel
distance to an extinguisher from any portion of
the building, shall not exceed 75 feet. UFC Sec.
10.303
( *) - 2A10B: C - Light and Ordinary Hazard
4A10B:C - Extra Hazard
( * *) 3,000 - Light Hazard
1,500 - Ordinary Hazard
1,000 - Extra Hazard
"Working" Smoke Detectors Save Lives
Randy Russell Design
October 29, 1993
Page 2
Note: Where flammable or combustible liquids are
used, "B" ratings of extinguishers may need to be
higher and travel distances shorter. See
requirements in National Fire Protection
Association Standard 10 -1.
Approval of submitted plans is not an approval of
omissions or oversights by this office or of non-
compliance with any applicable regulations of local
government.
If I can be of any further assistance to you, please
feel free to contact me at 5224609.
, Sincerely,
•U3(31/41
Bradley N. Wanamaker
Deputy Fire Marshal
BNW:kw
cc: City of Tigard Building Department
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September 17, 1993
Mr. Victor Adonri
City of Tigard
Community Development Department
13125 SW Hall Blvd.
Tigard, Oregon 97223
Dear Victor,
Northwest Landscaping Industries (NLI) seeks to erect a
20 foot by 27 foot addition to serve as a conference room. At
present the lunch room is utilized for employee meetings and
conferences. This is not convenient or comfortable, therefore, NLI
proposes the addition to meet its employee and business needs.
It is maintained that this is a minor modification for the
following reasons:
1) It is a commercial activity and does not affect
residential density or development.
2) Does not affect ratio or types of dwelling units.
3) It is an internal company change and will not require
additional on -site parking, which there exists an
abundance of at present.
4) The addition is designed to match the existing structure,
being of the same construction and appearance.
5) The addition matches the height of the existing structure
with an uninterrupted roof line.
6) No changes in the type and location of accessways and
parking areas will be required.
7) The function of the addition is internal to the company
and requires no increase in vehicular traffic.
8) The floor area of the existing structure is 22,400 square
feet and - the floor area of the addition is 562 square
feet, less than 10% of the existing area and less than
5,000 square feet.
•
Page Two
In general, the addition matches the existing building and is
screened from the street by a cedar fence, trees and landscaping.
The construction of the addition does not require the removal of
trees or the demolition of any existing structure.
For thesest reasons we ask that this proposal be considered a
minor modification.
Sincerely,
Randy Russell
Representing NLI
RJR /kh
cc: Diedra Conway