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City of Tigard, Oregon • 13125 SW Hall Blvd. • Tigard, OR 97223
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Zach Phillips
Pacific Telecom Services
1001 SE Water Ave, Suite 430
Portland, OR 97214
RE: Burnham Business & Storage Park Cellular Tower Minor Modification Request
Case File No. MMD2007 -00023
Dear Mr. Phillips:
This letter is in response to your request for a Minor Modification ( 1D2007- 00023) of the approved
site development plans (SDR98- 00010). There are two tax parcels within the Burnham Business &
Storage Park because the site crosses a tax map (8900 & 9500 SW Burnham Street, WCTM 2S102AD,
Tax Lot 2200 and WCTM 2S102DB, Tax Lot 200). The proposed generator is located on tax lot 200.
The original approval in 1998 was to construct a 100 foot wireless communications tower. All related
equipment for this tower was approved to be located within an adjacent storage unit. The tower is
enclosed within a six-foot high chain link fence. You have requested a Minor Modification to install a
40kw diesel back-up generator within the fenced area.
The site is located near sensitive lands associated with Fanno Creek. The applicant provided information
in the original land use approval that the lease area is above the 100 -year floodplain elevation. A service
provider letter from Clean Water Services has been provided that states no impact will be caused by the
proposed generator on nearby wetlands.
A noise study for the same type of generator at a Tacoma, WA site was provided by the applicant. The
study showed the generator to create 64 dBA at 23 feet. The proposed location of the generator is just
over 23 feet from the property line. The generator will operate for regularly scheduled maintenance and
during power failures. Since the site is located in a commercial zone adjacent to Fanno Creek Park, there
are no noise - sensitive units close to the site. Noise limits from the Tigard Municipal Code (TMC
7.40.160) are 60 dB between 9 pm and 7 am the following day and 75 dB any other time. If
maintenance is scheduled between 7 am and 9 pm, then the standards will be met. Noise generated
during power failures is exempt under TMC 7.40.180 for emergency equipment.
Analysis of Modification Request:
Section 18.360.060 of the Tigard Development Code Site Development Review chapter, states; "any
modification which is not within the description of a major modification as provided in section
18.360.050 shall be considered a minor modification."
Section 18.360.050 states that the Director shall determine that a major modification(s) has resulted if
one (1) or more of the changes listed below have been proposed:
1. An increase in dwelling unit density or lot coverage for residential development. The
proposal does not involve residential property. Therefore, this standard does not apply.
2. A change in the ratio or number of different types of dwelling units. This criterion is
not applicable as this request does not involve a residential development.
Page 1 of 3
Phone: 503.639.4171 • Fax: 503.684.7297 • www.tigard or.gov • TTY Relay: 503.684.2772
3. A change that requires additional on -site parking in accordance with Chapter 18.765.
Addition of a generator requires no additional on -site parking. This criterion is not
applicable.
4. A change in the type of commercial or industrial structures as defined by the
Uniform Building Code. No change in the structural occupancy type of the buildings is
proposed. Therefore, this criterion is not applicable.
5. An increase in the height of the building(s) by more than 20 percent. This criterion is
not applicable because no changes to the buildings are proposed with this application. The
total height of the generator is 5 feet, eight inches. This is far below the height of the
existing tower or adjacent building. This criterion has been met.
6. A change in the type and location of accessways and parking areas where off -site
traffic would be affected. The accessways are located on the northeast side of the site,
while the generator will be on the southwest side of the site within a fenced area.
Accessways and parking areas will not be affected by the proposed change.
7. An increase in vehicular traffic to and from the site and the increase can be expected
to exceed 100 vehicles per day. This addition of the generator will not create additional
vehicle trips to and from the site. Therefore, this criterion is satisfied.
8. An increase in the floor areas proposed for a non - residential use by more than ten
percent excluding expansions under 5,000 square feet. The applicant is not proposing
an expansion to the building floor area with this application. This standard does not apply.
9. A reduction in the area reserved for common open space and /or usable open space
that reduces the open space area below the minimum required by the code or
reduces the open space areas by more than ten percent. There are no areas reserved for
common open space for this development. This standard does not apply.
10. A reduction of project amenities (recreational facilities, screening; and /or,
landscaping provisions) below the minimum established by the code or by more than
ten percent where specified in the site plan. The proposed generator will be located
within a fenced, gravel area. No landscaping will be reduced by the installation. Portions of
the existing arborvitae screen need to be replaced. The applicant has proposed to replace
the dead plantings.
11. A modification to the conditions imposed at the time of Site Development Review
approval that is not the subject of criteria (B). 1 through 10 above this subsection.
The original site plan was approved through a Site Development Review in 1993 (SDR 98-
00010). Staff has reviewed this decision. There were no conditions imposed at the time of
approval.
This request is determined to be a minor modification to an existing site. The Director's designee has
determined that the proposed minor modification of this existing site will continue to promote the
general welfare of the City and will not be significantly detrimental, or injurious to surrounding
properties, provided that development which occurs after this decision complies with all applicable loca_,
state, and federal laws and the conditions below:
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CONDITIONS OF APPROVAL
PRIOR TO FINAL INSPECTION, THE FOLLOWING CONDITIONS SHALL BE
SATISFIED: (The staff contact shall be Cheryl Caines in the Planning Division (503) 639- 4171.)
1. Replace existing, dead arborvitae plantings which provide screening around the fenced area
within which the generator is located.
2. Scheduled maintenance for the generator shall only be performed after 7 a.m. PST and before 9
p.m. PST.
This request for Minor Modification approval is hereby granted.
If you need additional information or have any questions, please feel free to call me at (503) 639 -4171
ext. 2437.
Sincerely,
Cheryl Caines
Associate Planner
Page 3 of 3
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i ' ALL GROUNDING TO BE #2 AWG SOLID, BARE TINNED COPPER UNLESS OTHERWISE NOTED.
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b; N ( d � j 1. GROUND SUPPORT LEG OF GENERATOR TANK WITH 2 HOLE BOLTED GROUND LUG AND I TT ADDRESS I
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j ADDITIONAL NOTES:
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y' '� J. PROVIDE NEW CONDUITS TO NEW GENERATOR PER MANUFACTURER'S RECOMMENDATION
N i is I v"; „.;, ) N OVERALL AND • "" -, 7P 4. ALL PENETRATIONS INTO EQUIPMENT SHELTER TO BE PATCHED AND MADE WEATHER TIGHT.
ii ENLARGED SITE
`".. <A1 - .....• ' ii 5. VERIFY ALL UTILITIES PRIOR TO DIGGING. PLANS
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OVERALL SITE PLAN SPAM I' - 50' I 1 ENLARGED SITE PLAN scut 'v - '' 1 I w -I.B •10 o I
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City of Tigard, Oregon • 13125 SW Hall Blvd. • Tigard, OR 97223
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July 20, 2007
RE: EMERGENCY GENERATOR INSTALLATION l GAR
Project Information
Building Permit: BUP2007 -00348 Construction Type: VB
Address: 8900 SW Burnham Rd. Occupancy Type: B
Area: NA Stories: NA
The plan review was performed under the State of Oregon Structural Specialty
Code (OSSC) 2007 edition; 2007 Oregon Fire Code
1) Need to check generator start up at final inspection.
Approved Plans: 1 set of approved plans, bearing the City of Tigard approval
stamp, shall be maintained on the jobsite. The plans shall be available to the
Building Division inspectors throughout all phases of construction. (106.3.1
OSSC)
.espectfully,
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Wan Nelson
Senior Plans Examiner
Phone: 503.639.4171 • Fax: 503.684.7297 • www.tigard- or.gov • TTY Relay: 503.684.2772