HomeMy WebLinkAboutPermit 91-02-CUP - RHODE CAROL - CELLULAR ONE STATION CONDITIONAL USE91-2-cup 12228 51st place south
epic-5-91
91-1-cup
91-5-cup
cellular one
CONDITIONAL USE
6200 SOUTHCENTER BOULEVARD, TUKIVILA, WASHINGTON 98188
BACKGROUND
MEMORANDUM
TO: Planning Commission/Board of Architectural Review
FROM: Darren Wilson
DATE: June 20, 1991
SUBJECT: Cellular One 91- 2- CUP /91 -5 -DR Irrigation System
12228..51st Pl. South
PHONE N (206) 433.1800 Cary L. VanDusen, Mayor
Prior to the approval for 91 -2 -CUP & 91 -5 -DR on May 16, 1991, the Planning Commission
and Board of Architectural requested the availability of water for the proposed site. As
stated at the public hearing and referred to in attachment H in the staff report, a letter was
provided from the Public Works Department indicating that there is a water line available
for the proposed development. The water line would be used to irrigate the landscaping
around the one story cell base station.
The Public Works Director is requesting the Planning Commission to reconsider the
condition for an irrigation system for the landscaping around the Cellular One base station.
The attached memo from Ross Earnst describes the present water system. He explains that
the water system consists of undersized mains, substandard flow and inadequate pressure.
As a result, the Public Works Director recommends not allowing the connection to the
existing water system and waive the irrigation system. Condition #6 (Attachment B) by the
Planning Commission and Board of Architectural Review was to insert an irrigation system
only around the one story cell base station.
Page 2
RECOMMENDATION
ATTACHMENTS
A. Letter From Public Works Director (June 12, 1991)
B. Minutes from Public Hearing (May 16, 1991)
C. Landscape plan
Based upon the new information provided by Public Works, Planning Division . staff
recommend condition #6 be amended to read as follows:
The landscape plan be modified to contain native plant materials and the applicant provide
a three year maintenance agreement.
CITY OF TUKWILA
6200 SOUTHCENTER BOULEVARD, TUKW!LA, WASHINGTON 98188
May 20, 1991
Interstate Mobile Phone Company (Cellular One)
617 East Lake Avenue East, Suite 200
Seattle, WA 98119
RE: Notice of Decision by the Planning Commission and the Board of
Architectural Review File Numbers: 91 -2 -CUP and 91 -5 -DR
This is to confirm that the Planning Commission and Board of
Architectural Review (BAR) approved both applications as presented
on May 16, 1991. (The conditions are listed on Attachment A.
The BAR also adopted the findings and conclusions contained in the
Revised Staff Report dated May 10, 1991.
Any changes to the specific design approved by the Planning
Commission and BAR will require further Planning Commission and BAR
approval. Minor, incidental changes may be administratively
approved by the Director of Community Development.
The decision of the Planning Commission and BAR is not final until
the appeal period has elapsed, which is ten calendar days after the
above date of decision. Appeals must be filed in writing to the
City Clerk by 5:00 pm on the final day of the appeal period.
Where the final day of an appeal period falls on a weekend or
holiday the appeal period will be extended to 5:00 pm on the next
work day.
If you should have any question regarding this project, please feel
free to write or call.
Sincerely,
Darren Wilson
Assistant Planner
NOTICE OF DECISION
PHONE # 206) 433.1800 Cary L. l'anlhtarn, Mayor
DATE: May 17, 1991
NOTICE OF DECISION CONDITIONS
FILE: 91 -2 -CUP & 91 -5 -DR; CELLULAR ONE
The Planning Commission and Board of Architectural Review approved
the 91 -2 -CUP and 91 -5 -DR (Cellular One) application on May 16,
1991, with the following conditions.
1. They agreed with staff's (3) three recommendations.
A. The applicant shall provide a three foot barrier along the
front of the property which shall be set back 15 -feet from the
property.
B. The applicant shall provide two 2" (inch) caliper, large
stature trees in front of the barrier to minimize any visual
impacts. The applicant has that if the lease is terminated,
the site will return to its current state.
C. The applicant shall provide a sprinkler system for the
landscaping around the entire one story cell base station.
ADDITIONAL CONDITIONS ADOPTED BY THE PLANNING COMMISSION AND BOARD
OF ARCHITECTURAL REVIEW COMMITTEE;
1. Move the driveway-to the southerly portion of the property and
place a 3 -foot barrier, set back 15 -feet front the public
right -of -way with a chain across the front for maintenance use
only.
2. Place landscaping on both sides of the 3 -foot barrier.
3. Place a metal monopole instead of the proposed treated wooden
telephone pole.
HEARING DATE:
FILE NUMBER:
APPLICANT:
REQUEST:
LOCATION:
ACREAGE:
COMPREHENSIVE
PLAN DESIGNATION:
ZONING DISTRICT:
SEPA
DETERMINATION:
ATTACHMENTS:
CITY OF TUKWILA
6200 SOUTHCENTER BOULEVARD, TUtiWILA, WASHINGTON 98188
STAFF REPORT
TO THE PLANNING COMMISSION AND BOARD OF ARCHITECTURAL REVIEW
Revised May 10, 1991
May 16, 1991
91 -2 -CUP & 91 -5 -DR Cellular One
Interstate Mobile Phone Company
PHONE # 12061433.1800 Cary L. VanDuscn, Mayor
Planning Commission approval for (91 -2 -CUP) Conditional
Use and Design Review approval for (91 -5 -DR)
To construct a cellular radio base station with a 100 foot tall
monopole, and 2,500 square foot utility room.
12228 51st Place South
2,500 square feet
Heavy Industrial
M -2 Heavy Industry
A Determination of Non - significance was issued April 12,
1991.
A. Site & Grading Plan
B. Cross Sections
C. Adjacent Parcels Map
D. Landscape Plan
E. Photos of surrounding area will be presented at Public
Hearing
F. Color rendering of final product will be presented at
Public Hearing
G. Maintenance Agreement
H. Public Works letter
STAFF REPORT PAGE 2
91 -1 -CUP
VICINITY /SITE INFORMATION
4. Terrain: The site is flat.
BACKGROUND
FINDINGS
2. Existing Development: The site is vacant.
1. Project Description: To install a cell base site consisting of a 100 foot telephone
pole (tower) with 12 directional antennas, and 12 by 28 foot concrete shelter to
house electronic equipment and a 6 foot high chain link fence with perimeter
landscaping.
3. Surrounding Land Use: The site is located directly east of Burlington Northern
Railroad's right -of -way. Riverton Construction is located north of the site. Single
family residence are located north, south and west of the site.
The Interstate Mobile Phone Company is proposing to construct a cellular radio base
station (cell site). The height of the proposed structure is 100 feet. The structure would
be a treated wooden telephone pole with 12 directional antennas attached to the top of
the pole on an amps platform. The antennas would not exceed the top of the telephone
pole. A one story 12'x 28' electronic equipment vault would be constructed of concrete
with a washed aggregate finish. To provide security, the telephone pole and electronic
equipment vault will be enclosed with a 6' chainlink fence with 2' or 3' strand barbed .
wire on top. The vault and pole are alarmed and monitored 24 hours a day, 7 days a
week, by an operations center.
STAFF REPORT PAGE 3
91 -2 -CUP
The proposed Allentown site would be the second telecommunication tower located
within the City's boundaries. The first site was approved in March of 1990, this site is
located off of Longacres Way.
The Planning Commission continued the public hearing on April 25, 1991 to obtain
additional information they had requested. That additional information is incorporated
in this revised staff report.
DECISION CRITERIA: CONDITIONAL USE
The Conditional Use criteria are shown below in bold.
18.64.050: General Review Criteria.
(1) The proposed use will not be materially detrimental to the public welfare or
injurious to the property or improvements in the vicinity of the proposed use or
in the district in which the subject property is situated;
This site lies on an existing 15 -foot high embankment with some existing vegetation,
which will help to minimize the visual impacts of the site. Landscaping will be added to
the perimeter of the site to help buffer and screen the electronic equipment vault and
the base of the telephone pole. The proposed structure will be a treated wooden
telephone pole. Wooden telephone poles used for telephone service presently exist in
the area (see pictorial). The cellular telephone pole will be largely indistinguishable from
the existing telephone poles.
Cellular radio power density levels are regulated by government as a potential
environmental concern. Radio frequency emissions from the Allentown "cell site" facility
will be at 869 to 880 megahertz and 18 gigahertz for radio link transmissions will be
low power with less than 45 watts for cellular radios and 0.1 watts for the 18 gigahertz
radio link. As such, the radio frequency power density levels near the cellular telephone
pole (10 feet above ground below the telephone pole) will be extremely low several
magnitudes below existing maximum permissible human exposure standards.
The maximum cellular radio transmission radio frequency power density will be 1.3
microwatts per square centimeter at the telephone pole base while the maximum 18
gigahertz radio link radio frequency power density would be less than 0.0014
microwatts per square centimeter. By comparison the recommended maximum exposure
levels by the federal Communications Commission and (ANSI) American National
Standards Institute are 2,800 microwatts per square centimeter.
>�
STAFF REPORT PAGE 4
91 -2 -CUP
King County, for instance, has proposed a much more conservative standard of 200
microwatts per square centimeter which still exceeds the highest level emitted by the
proposed Allentown cell site by a factor of 154. These very low power levels and ultra
high frequencies at which the cell site transmissions occur also eliminate any potential for
interference to other electronic devices such as radio, telephone, VCR's, telephone and
medical devices such as pacemakers.
(2) The proposed use shall meet or exceed the performance standards that are
required in the district it will occupy;
Under the M -2 (Heavy Industrial) the required landscaping is 15 feet in the front yard
only. The applicant has included 15 feet of landscaping in the front and 5 feet around
the rest of the development. The applicant has provided a maintenance agreement with
the property owner, which states that the property owner will maintain the lawn area
which is not leased by Cellular One. Cellular One will maintain the landscaping in their
leased area on a quarterly basis. The owner has also agreed to let Cellular One erect a
six foot chainlink fence across the front line of the property.
The front yard setback for this zone is 25 feet. The applicant has a distance of 70 feet in
the front yard. The applicant has provided one parking stall for the service vehicle inside
the cell base station. In the event that the property is vacated, both the electronic
equipment, vault, and the telephone pole will be removed and the foundation for both
structures would be removed to a depth of two feet below grade.
With regard to water availability on the proposed property, the Public Works
Department has considered those connections to be vested and adequate for domestic
residential use. In turn, Cellular One will provide an underground sprinkler system to
their landscaping plan. In the event that the water system is inadequate, Cellular One
will provide vegetation that will grow with natural weather conditions.
(3) The proposed development shall be compatible generally with the surrounding
land uses in terms of traffic and pedestrian circulation, building and site design;
The proposed cell site is an unmanned facility. The major traffic will occur during
construction. The construction period should be 4- 5 weeks. The hours of construction
will range from 7:00 a.m. to 7:00p.m. Monday through Friday. Once the construction has
been completed, the site will be visited semi - monthly for maintenance by one individual.
There are no pedestrian facilities along 51st Place South. The surrounding land uses are
residential to the north, south and west, while on the east there is commercial uses. The
STAFF REPORT PAGE 5
91 -2 -CUP
treated wooden pole will blend in with the existing treated wooden poles for utility uses
adjacent to the development.
(4) The proposed use shall be in keeping with the goals and policies of the
Comprehensive Land Use Policy Plan;
There are no specific policies of the Tukwila Comprehensive Plan which address this type
of utility. Under the Comprehensive Policy Plan; Transportation/Utilities, Goal 3 Page
19, states " Assure a public service level consistent with the needs and desires of the
community."
(5) All measures have been taken to minimize the possible adverse impacts which the
proposed use may have on the area in which it is located;
The cellular telephone pole with be constructed of treated wood and will blend with the
existing wooden telephone poles in the area. The monopole and base station will be
located toward the rear of the parcel to locate it as far as possible from adjacent
residential uses. Behind the site (to the east) is an existing 15 -foot high embankment
with some existing vegetation which will help to minimize the visual impacts of the
wooden telephone pole.
In addition, landscaping will be placed around the perimeter of the site to mitigate the
visual impacts of the base of the telephone pole and the vault in the future. The small
(12'x28') one -story concrete electronic equipment vault includes an attractive exposed
aggregated finished.
CONCLUSIONS
1. Criteria 1: Due to the location and type of proposed use, this will not be
materially detrimental to the public welfare or injurious to the property or
improvements in the vicinity.
2. Criteria 2: The applicant has exceeded the requirements for the landscaping,
setbacks and the parking per City's standards. The applicant and owner have
provided a maintenance agreement for the landscaping. Public Works has
indicated that water is available at the proposed site. The applicant has stated tht
if the lease is terminated, the site will return to its present state.
STAFF REPORT
91 -2 -CUP
RECOMMENDATIONS
The Planning Division recommends approval with the following conditions:
1) The applicant shall provide a finished lawn around the entire site with a
sprinkler system;
PAGE 6
3. Criteria 3: Since the proposed facility is a unmanned, it should be compatible
with the surrounding land uses in terms of traffic and pedestrian circulation.
However, there is concern as to the quality of the appearance of the site. There
are opportunities to improve the cover around the site and add trees along the
street which would improve the appearance of the site. Some type of barrier may
be needed to minimize people from driving on to the lawn area.
4. Criteria 4: Since there are no applicable policies that deal with the specific
request, the request for a conditional use permit would not adversely affect the
implementation of the Comprehensive Land Use Policy Plan.
5. Criteria 5: The applicant has addressed all measures in minimizing any adverse
impacts for this area. The applicant has proposed a treated wooden telephone
pole to match the surrounding poles.
2) The applicant shall provide a three foot barrier along the front of the property
which shall be set back 15 feet from the property line;
3) The applicant shall provide two 2" caliper, large stature trees in front of the
barrier to minimize any visual impacts. The applicant has stated that if the lease
is terminated, the site will return to its present state.
STAFF REPORT PAGE 7
91 -2 -CUP
DESIGN CRITERIA - DESIGN REVIEW
Since the proposed site is located within 300 feet of a residential zone, Board of
Architectural Review approval is necessary.
18.60.050: General Review Criteria.
(1) Relationship of Structure to Site.
a. The site should be planned to accomplish a desirable transition with
streetscape and to provide for adequate landscaping and pedestrian
movements.
b. Parking and service areas should be located, designed and screened to
moderate the visual impact of large paved areas.
c. The height and scale of each building should be considered in relation to
the site.
The site will be located at the rear center of the parcel to locate it as far as possible
from adjacent residential uses. The cellular telephone pole will be constructed of treated
wood and will be virtually indistinguishable from existing telephone poles in the area. An
existing 15' high embankment with some vegetation is located directly behind to the east
of the site which will help to minimize the visual impacts of the wooden telephone pole.
The landscaping will be provided around the perimeter of the pole and vault to further
mitigate any visual impacts of the vault or the base of the pole. The exterior finish of
the concrete electronic equipment vault will be aggregated rock.
(2) Relationship of Structure and Site to Adjoining Area.
a. Harmony of texture, lines and masses is encouraged.
b. Appropriate landscape transition to adjoining properties should be
provided.
c. Public buildings and structures should be consistent with the established
neighborhood character.
d. Compatibility of vehicular pedestrian circulation patters and loading
facilities in terms of safety, efficiency and convenience should be
encouraged.
e. Compatibility of on -site vehicular circulation with street circulation should
be encouraged.
Please refer back to Criteria #3 of the Conditional Use.
STAFF REPORT PAGE 8
91 -2 -CUP
(3) Landscaping and Site Treatment
a. Where existing topographic patterns contribute to beauty and utility of a
development, they should be recognized, preserved and enhanced.
b. Grades of walks, parking spaces, terraces and other paved areas should
promote safety and provide an inviting and stable appearance.
c. Landscape treatment should enhance architectural features, strengthen
vistas and important axis, and provide shade.
d. In locations where plants will be susceptible to injury by pedestrian or
motor traffic, mitigating steps should be taken.
e. Where building sites limit planting, the placement of trees or shrubs in
paved areas is encouraged.
f. Screening of service yards, and other places which tend to be unsightly,
should be accomplished by use of walls, fencing, planting or combination.
g. In areas where general planting will not prosper, other materials such as
fences, walls and pavings of wood, brick, stone or gravel may be used.
h. Exterior lighting, when used, should enhance the building design and the
adjoining landscape. Lighting standards and fixtures should be of a design
and size compatible with the building and adjacent area. Lighting should
be shielded, and restrained in design. Excessive brightness and brilliant
colors should be avoided.
Please refer back to Criteria #2 of the Conditional Use.
(4) Building Design
a. Architectural style is not restricted, evaluation of a project should be based
on quality of its design and relationship to its surroundings.
b. buildings should be to appropriate scale and in harmony with permanent
neighboring developments.
c. Building components -such as windows, doors, eaves, and parapets should
have good proportions and relationship to one another. Building
components and ancillary parts shall be consistent with anticipated life of
the structure.
d. Colors should be harmonious, with bright or brilliant colors used only for
accent.
e. Mechanical equipment or other utility hardware on roof, ground or
buildings should be screened from view.
f. Exterior lighting should be part of the architectural concept. Fixtures,
standards, and all exposed accessories should be harmonious with building
design.
g. Monotony of design in single or multiple building projects should be
avoided. Variety of detail, form and sitting should be used to provide
visual interest.
STAFF REPORT PAGE 9
91 -2 -CUP
The proposed electronic equipment vault has an attractive rock aggregate finish (see
attached photo). Air conditioning units are located at either end of the vault and are
painted complementary color to the rock aggregate finish. The building has a steel door
(for security) painted to match the air conditioning units.
(5) Miscellaneous Structures and Street Furniture
'- There will be no miscellaneous structures or street furniture associated with the proposed
site.
CONCLUSION
RECOMMENDATIONS
The design review criteria have been largely discussed in the Conditional Use section of
the staff report
Staff recommends approval as submitted, with the following conditions:
1) The applicant shall provide a finished lawn around the entire site with a
sprinkler system;
2) The applicant shall provide a three foot barrier along the front of the property
which shall be set back 15 feet from the property line;
3) The applicant shall provide two 2" caliper, large stature trees in front of the
barrier to minimize any visual impacts. The applicant has stated that if the lease
is terminated, the site will return to its present state.
CITY OF TUKWILA
6200 SOUTHCENTER BOULEVARD, TUKWILA. WASHINGTON 98188
HEARING DATE:
FILE NUMBER:
APPLICANT:
REQUEST:
LOCATION:
ACREAGE:
COMPREHENSIVE
PLAN DESIGNATION: M -2 Heavy Industrial
ZONING DISTRICT:
SEPA
DETERMINATION:
ATTACHMENTS:
M -2 Heavy Industrial
PHONE N (2061433-1800
STAFF REPORT
TO THE PLANNING COMMISSION
Prepared April 17, 1991
■
April 25, 1991
91 -2 -CUP
Interstate Mobile Phone Company
Conditional Use approval to construct a cellular radio base
station.
12560 51st Place South
2,500 square feet
A Determination of Nonsignificance was issued April 12,
1991. •
Gun L. VanUusv,
A. Site & Grading Plan
B. Cross Sections
C. Adjacent Parcels Map
D. Landscape Plan
E. Photos of surrounding area will be presented at Public
Hearing
F. Color rendering o final product will be presented at
Public Hearing
avur11:0 •
: •2•.` Its •
3/.01 MY MOW/ •• ••• 111•1_•!..•13)..
•44110., an no u,opullitit
1.4•1001010111:n1t:W.nr
at ..0.0.0.0,00.0n, p.,.•fik, a
n0ric. mann; 0 00. 1 3:Are
NOT■talf. na Or, Mr. /LS .
at.• .08/13 I. na_rnall• Ii�
<V tam .4. I.
OLINI 'tNIt
)(
rh iasinsmia
WIND INXINES IN MU
CALL WOK YOU 010
1-1100-424-1155
roiait
itft611
• \
woe
nit
S.
• 1 10'
a.
. .
sem
▪ str
124TH STREET
SITE PLAN
\ •
v‘
Ukttte*Ti kUUtht JAW tUhiii
•
•
•
fs"
•41
1131LNILMITIL
I. Mow. MIR MI =WI ••••111. IV MINIUM .11•1111
•••■•■ ••••••••• IM••••11•110. SEM •It•••••
••• ow... al.,.
•
•
liian
Kass [Wm.,
■ •I 14
a.... me WOO, „dint
=V .EV410, 0:71•• ••••••
.fillitkitr WAIL
a. 11MM ••••••••••• •I• ••••••• •••••• ••••••••• OM
01••■•• 41M 41.• 1•IM, ••• MEV
p. 01•1•11• •••• • MOM IV 11. 0•11•••. •••••■
▪ •■••• •• ••• •••••• VOW.% •••.
a. •_l••• VIM a tat OWN Oa •• PIM •••
a_NI INIS e. NM Ill. ••• •••• a OMR%
▪ MM. C1110 MO.& Mom. • ••••••••
S. 41 11•••• 1111••■"••Ii • IN •••
• ••• •••• 11•14 WO. • •04 MS.. moo
61••• len ••••• • Oa Mb ow aa•••••• .10
a • • fil• •••••• wei• •
,. MO 61 61114 ti • MD •••
00 •••• HI* •••■■
OWN ••• 01RL • MN .11 0 ••■• O.. a 4••■•••
vein 0q do. /V a.., wawa
.0110111. Ill,. ra•N•41■1 OK et NMI& Am im •••
10••••••.
II Won 10 in Of NAM mil *goon al.. 5 NI
O M.
•11, 0•11 • M••••• am. odds 1••■•
Alt41•11
I
t '4) I
•■••••••••••
Row ••••• am in* Wawa Wan
1
401 TO Cr nrn f0111:0115111t1104
-3. 1 I St
ar•••••• •• •
0•-•—•—tia
OUPWICIPI Of.LVIL
•••••■
•14••
•••••••—•••■••• •••••••=t
LitraIrra•r• 1••••••
••••••••• .•••• •••••••■
0 01Ans
LINK MCC MOM)
1.3.01( EMMY
••• 1•••••
.•••••
3-1001 011111011
.•••' ot•rm am./PICD EOM
•••• alinla LEASE MCA
■
\ 10070111C - 3
MICGM
PRELIMINARY
•
S o •
• • /0 •
Tr.1
0.
is •
• •• 4•• r ,
.1•4
vial/
SITE DETAIJ,
It100300111T
t0031001 COMO.
'flu
(0013111UCT
1
3.3. 11.0
LIMITS
11XCAVATIO11
3
telly=
s. Lilt
titil. MOWN Loll
ALLENTOWN SITE SE 109
SITE PLAN, GRADING & DETAILS
CELLULAR ONE
-
Hodges & Roth Engineering. Inc.r
(••••••• • 0.. ••••••••••• • ••••••••• • •••••••••••••
• SKIN, •••••••••• 1••••••••• 11•000.11.•••• •-••••••••••••11
. •
•TWILIT 11.I
, Piga 01411"10.1r, ;
ATTACHMENT A
, . an t, . .
,...__
111- 011
• YLjft
Noun% i}
.t.)
tt.
Wet 'dal
° "1
• .kia
ea. art •
rats* ennok.NROLFIRI
I onsauetials et erim
411
rural atm. 01111MAIIN
0116,11=101 IN WW1
----
.31=11AMA
'.to vas! Nam. I tilt.
iloo.
Matt tit VIM
1,41■11t:LI
•
V MCC
(IN
• tiliG aiar
r.•. 11.0
UON
14 (1
ATTACHMENT B
.: 14111r4r ,.. "
_ d
3
[ME
�
�l�t>�
0:1=1 REM
rimminzi
EMI NNW
PRP
a. 14th STREIT
s I2S% ■ STRUT_
I. lilted IThlr
U'
Oil
CEININIRINEW
EilERCIRIEM
CAM _RPM
MU ULM
PO Of 1 MEW
32
11111.41111114111101111111.
MINA
UMW =II
N II
\\M W
\
? ,\ . ..
2; \
• ..
•a 2 \
•
•
•
•
� A '
A 1 0 ; •
t
.. \ 1: \
•
..
Aj$W UT AO Ytitt
. r rilt W!Jh
SE 10 -23 -4
•
SW 11 -23 -4
'PROJECT AREA
0
13
C 0
•
• 110111
PRELIMINARY
NT
TI N MI OWE=
ALLENTOWN SITE SE 109
ADJACENT PARCELS MAP
CELLULAN ONE
Medps $ Roth Engln.Kteq, Ino
ttMR•n•• t••••ftN • hr<!tt • •.At•f t 1
- • +•tom. •aw. n.N..w• .t.n..•.w ..«..•.
ATTACHMENT C
• \
V I AISCSSIfiatS
1 -.
}
1 A !1W 'i 11i -. 1 {mil
•
PlantL.Den
am% eaaarlt 11.lpL
n.nt
8
O+
0i
MirOrT wnafr ay. I1 r -Ir us Mai ntw
t ies lnuta•
MI.a.1a choir n,, I I Mt. as
.aMtin •ut•arcp•
X11. ►.1. Wt Mamma .l I Site L•
ttaatt
I n..TT.t. mama., I TS,. 17 - 1t' LY . 11 , 111 an
a.w aaiart
.+� .t. •�•S.T•rtt+: • .-ra
7.�.iJ p_moan
Jnianung_sin >P
. -.Y monism r •.Tlea isd brim A ualldilf tiat�
Mart ems Ina UM O..un U tans n.Lf. T L a
A mops. NO ALL MOM a nu nom. we vas — at a ...It.
it A .Ml.. no •0••••• or ••• vows.* In.1tMt
I. •M Purr w Mom ewt. Wail Amu. nn • n tmiL Y a II.
TRIP MIL Ittea.a.ta In. 11111 .a an. flit
mu Mn a ALi. nat. som••• l- Laval a .1t•• n.S W.
Ira um mar.
I. ere ar to MIL 1T• to LW to MS 1O14• • NY dbl.
■•M• rum •••• relit all rn• a rum, •••• .a ems n
rinal, =mom. mmi W
OW all. M 4 Mry.oLl rryy..l
pm Wit A I a SOIL natal. Pa an SILO LLI a.IN.
- woos%
Lam my amLtto III OWnact + Mali '• LM
n ln.. NMI r Ma 5511 Mae amt I. i.T. •• w
mu Marae a nt. limits Oa PIML
I. A - r.RMM n/TA .n ILL csi ILl a is IiY ..NIYI
I Anna a . .MSO.MT.ols MiP a las Pales tw l w an. -
ta to M .an a .YOM. a.1 combs aw L. YLSO-
mum aa.7••••
I. tan yarn. M. was L.. OOa 1.51, slat e l 1
tIM sass a !AMP M lR Mahe Wa a ta MM Y t 1 -
I
a A .. _ ...r.. ML Tlnuta It L. IS 1Y.aoo . M -
Tt• as n • • mu S we .t.ss M �eia
as •Malal WM.
.In ntm n A tML tA.t4 In. t1Ja.a •
a nom a Yi *511 AM AMMO rmina .M
I. • ti_nn alarm IOWA li iiiIi + k� wimples
a a. a A taann awls. a lilt. mown 1.* ammonia.
me A• .1..s.. a a an •Ana ,la
I. its nil AMMO. PPM a oo .a.tn tMa ` i MN a PWnre r OM a .MWRI. A al l a w • OI A
AM am A•O t.n(N1a MA Pala ip 1e0. Ia /I.M
• iccan.a. APT ..nT.Mat Mar Mama .b.t.a NUL a I.LLTLT
Anus w a ri MS ninw u.wl M all Nana,.
Tres atk*ing tlwlsatlas
U.1 IT
1
•� LI 11 yy.�� Ytr s
wR•
�sc
PtV -�
11..E
;-- � �u
R
•
WAC 197.11 -970
DETERMINATION OF NONSIGNIFICANCE
Description of Proposal To install a 100 -foot treated wooden teleahone •ole which
will include 12 directional antennas mounted on an amp platform at the top of the
pole. In addition, installation of a 12' X 28' electronic equitment vault.
Proponent Interstate Mobile hone Comian C "11'lar On+4
Location of Proposal, including street address, if any 12560 51st Place South
Section 10, Twn 23, Rq 4.
Lead Agency: City of Tukwila File No. EPIC -5 -91
The lead agency for this proposal has determined that it does not have a probable
significant adverse impact on the environment. An environmental impact statement:
(EIS) is not required under RCM 43.21C.030(2)(c). This decision was made after
review of a completed environmental checklist and other information on file with the
lead agency. This information is available to the public on request.
a„ There is no comment period for this DNS
This DNS is issued under 197.11 - 340(2). Comments must be submitted by
. The lead agency will not act on this
proposal for 15 days from the date below.
responsible Official Rick Beeler
'osition /Title Planning Director
\ddress
late
6200 Southcenter Boulevard, Tuk+jlapllA198188
Signature
Phone 433.1846
'ou may appeal this determination to the City Clerk at City Hall, 6200 Southcenter
Boulevard, Tukwila, WA 98188 no later than 10 days from the above date by written
►ppeal stating the basis of the appeal for specific factual objections. You may be
. squired to bear some of the expenses for an appeal.
:opies of the procedures for SEPA appeals are available with the City Clerk and
Tanning Department.
M.ONS
•
CITY OF TUKWILA
COMMUNITY DEVELOPMENT DEPARTMENT
Carol Rohde
Cellular One
617 Eastlake Avenue East
Seattle, WA 98109
389 -5300
Environmental Checklist
Conditional Use Permit - 4 months
- 3 months
Permanent Site Construction - 4 -6 weeks
-a o
1
A. BACKGROUND
1. Name of proposed project, if applicable:
Allentown Cellular Communications Site
Permanent facility
2. Name of applicant:
Interstate Mobilephone Company
d /b /a Cellular One
3. Address and phone number of applicant and contact person:
4. Date checklist prepared:
January 1, 1991
5. Agency requesting checklist:
City of Tukwila, Community Development Department
6. Proposed timing or schedule (including phasing, if
applicable):
7. Do you have any plans for future additions, expansion, or
further activity related to or connected with this proposal?
If yes, explain.
No. This proposed permanant facility is to replace a
temporary communication facility at the same site.
8. List any environmental information you know about that has
been prepared, or will be prepared, directly related to this
proposal.
None known.
A soils analysis has been prepared by Rittenhouse Zeman
Associates. (See attached)
9. Do you know whether applications are pending for governmental
approvals of other proposals directly affecting the property
covered by your proposal? If yes, explain.
10. List any governmental approvals or permits that will be needed
for your proposal, if known.
Conditional Use Approval
n" °'tom ear d
FAA pending
2
11. Give brief, complete description of your proposal, including
the proposed uses and the size of the project and site. There
are several questions later in this checklist that ask you to
describe certain aspects of your proposal. You do not need to
repeat those answers on this page. (Lead agencies may modify
this form to include additional specific information on
project description.)
Install a 100' wooden telephone pole which will include 12
directional antennas mounted on an amps platform at the top of
the pole. The platform and antennas will not exceed the
height of the telephone pole. In addition, installation of a
12' X 28' electronic equipment vault. The approximate 2,500
square foot lease area (50'X50') will be cleared of
vegetation. A 6' high security fence with 2' of barbed wire
on top will surround the site. The cleared area inside the
fence will be finished with gravel. A landscape plan for
perimeter shrub plantings is provided with this application
and will screen the equipment vault and base of the telephone
pole.
12. Location of the proposal. Give sufficient information for a
person to understand the precise location of your proposed
project, including a street address, if any, and section,
township, and range, if known. If a proposal would occur over
a range of area, provide the range or boundaries of the
site(s). Provide a legal description, site plan, vicinity map,
and topographic map, if reasonably available. While you are
not required to duplicate maps or detailed plans submitted
with any permit applications related to this checklist.
Site lies northwest of 51st Place S and north of 124th Street.
It is located directly southwest of Northern Pacific Railroad
Company right -of -way. Site address is 12560 51st Place S,
Allentown, WA.
13. Does the proposal lie within an area designated on the City's
Comprehensive Land Use Policy Plan Map as environmentally
sensitive.
No.
B. ENVIRONMENTAL ELEMENTS
1. Earth
a. General description of the site (circle one). t , rolling,
hilly, steep slopes, mountainous, other
b. What is the steepest slope on the site (approximate percent
slope) ?
Less than 2% on site. Northeast of the site is an
approximately 15 foot high railroad embankment.
c. What general types of soils are found on the site (for
example, clay, sand, gravel, peat, muck)? If you know the
classification of agricultural soils, specify them and note
any prime farmland.
The soils at the site of the soils test boring consisted of
approximately 1 foot of topsoil underlain by approximately a
6 foot layer of medium stiff, sandy silt. Below the sandy
silt layer was generally a sand with some silt with silty sand
seams. This layer was very loose from approximately 7 to 11
feet, grading to medium dense to a depth of 16 feet to the
bottom of the boring at 33 1/2 feet.
d. Are there surface indications or history of unstable soils in
the immediate vicinity? If so, describe.
No surface indications of unstable soils are present.
e. Describe the purpose, type, and approximate quantities of any
filling or grading proposed. Indicate source of fill.
Some clearing will occur to remove grass and shrubs. Most of
the clearing will have occurred for the construction of the
temporary cell site consisting of a wooden telephone pole and
12'X 28' electronic equipment vault.
f. Could erosion occur as a result of clearing, construction, or
use? If so, generally describe.
A minimal area of approximately 2,500 square feet of area will
be cleared. A temporary erosion control fence will be added
around the southeast and northeast portions of the leased site
to filter silt and sediment. Storm water is expected to sheet
flow to an existing open ditch conveyance system to the
3
northeast side of the site, or to be absorbed into the ground.
The site is flat, and not susceptible to erosion by its
topography. If erosion occurs during construction, straw
bales or other erosion control materials will be placed at the
edge of the property line to filter out any sediments that
result from construction.
g. About what percent of the site will be covered with impervious
surfaces after project construction (for example, asphalt, or
buildings)?
The permanent facilities will introduce approximately 350
square feet of impervious surface for the electronic equipment
vault and base of the wooden telephone pole. The balance of
the site will be covered with gravel, shrubs and grasses. The
property contains 10,005 square feet. The cellular facility
will add 350 additional square feet of impervious surface for
a total coverage of approximately 3.5% square feet of the
entire property.
h. Proposed measures to reduce or control erosion, or other
impacts to the earth, if any:
Typical erosion and sedimentation control measures (hay bail
or other appropriate materials and a temporary erosion control
fence on the northeast and southeast portions of the site)
will be implemented in accordance with City regulations for
the building permit.
2. Air
a. What types of emissions to the air would result from the
proposal (i.e., dust, automobile, odors, industrial wood
smoke) during construction and when the project is completed?
If any, generally describe and give approximate quantities if
known.
Light vehicular traffic during 4 to 6 weeks of construction.
Approximately one trip every other week (2 vehicle trips per
month) will be generated by the facility for maintenance
purposes.
b. Are there any off -site sources of emissions or odor that may
affect your proposal? If so, generally describe.
None known.
c. Proposed measures to reduce or control emissions or other
impacts to air, if any:
None.
3. Water
4
a. Surface
1) Is there any surface water body on or in the immediate
vicinity of the site (including year -round and seasonal
streams, saltwater, lakes, ponds, wetlands)? If yes, describe
type and provide names. If appropriate, state what stream or
river it flows into.
The Duwamish River is located approximately a quarter of a
mile north of the site. The site does not lie within a
floodway or floodplain of this river.
2) Will the project require any work over, in, or adjacent to
(within 200 feet) the described waters? If yes, please
describe and attach available plans.
No
3) Estimate the amount of fill and dredge material that would
be placed in or removed from surface water or wetlands and
indicate the area of the site that would be affected.
Indicate the source of fill material.
Not applicable
4) Will the proposal require surface water withdrawals or
diversions? Give general description, purpose, and
approximate quantities if known.
No.
5) Does the proposal lie within a 100 -year floodplain? If so,
note location on the site plan.
No
6) Does the proposal involve any discharges of waste
materials to surface waters? If so, describe the type of waste
and anticipated volume of discharge.
No. This is an unmanned site and requires no waste
disposal.
b. Ground
1) Will ground water be withdrawn, or will water be
discharged to ground water? Give general description, purpose,
and approximate quantities if known.
No
2) Describe waste material that will be discharged into the
ground from septic tanks or other sources, if any (for
example: Domestic Sewage; industrial, containing the following
5
chemicals...; agricultural; etc.). Describe the general size
of the system, the number of such systems, the number of
houses to be served (if applicable), or the number of animals
or humans the system(s) are expected to serve.
None. No waste material is produced by this proposal.
The site is unmanned, thus no water or sanitary sewage
service is required.
c. Water Runoff (including storm water):
1) Describe the source of runoff (including storm water) and
method of collection and disposal, if any (include quantities,
if known). Where will this water flow? Will this water flow
into other waters? If so, describe.
Negligible runoff will result from the addition of
approximately 350 square feet of impervious area around
the base of the permanent pole and under the electronic
equipment vault. There is an open ditch conveyance
system on the northeast side of the site which will
handle roof runoff.
2) Could waste materials enter ground or surface waters? If
so, generally describe.
No waste materials will be generated on the proposed
site.
d. Proposed measures to reduce or control surface, ground and
runoff water impacts, if any:
A temporary erosion fence will be installed during the
construction of the site. It will consist of a mesh
fence 1' into the ground and extending 3' above ground.
Granular rock will be placed on top of the mesh fencing
to help filter silt and sediment caused by water runoff.
There is an open ditch conveyance system on the northeast
side of the site which will handle roof runoff.
4. Plants
a. Check or circle type of vegetation found on the site:
deciduous tree: alder, maple, aspen, other
_X_ evergreen tree: fir, cedar, pine, other
X shrubs
_ X grass
pasture
crop or grain
wet soil plants: cattail, buttercup, bulirush, skunk
cabbage, other
water plants: water lily, eelgrass, milfoil, other
other types of vegetation
6
•
b. What kind and amount of vegetation will be removed or
altered?
The construction of the wooden telephone pole and
installation of the electronic equipment shelter will
require removal of grasses, berry vines and shrubs.
c. List threatened or endangered species known to be on or
near the site.
None known.
d. Proposed landscaping, use of native plants, or—other
measures to preserve or enhance vegetation on the site,
if any:
Landscaping will be placed around the perimeter of the
cellular facility to provide screening for the electronic
equipment vault and the base of the wooden telephone
pole.
5. Animals
a. Circle any birds and animals which have been observed on
or near the site or are known to be on or near the site:
birds: hawk, heron, eagle, nabi , other:
mammals: deer, bear, elk, beaver, other:
fish: bass, salmon, trout, herring, shellfish,
other dons, cats
b. List any threatened or endangered species known to be on
or near the site.
None known
c. Is the site part of a migration route? If so, explain.
Not known
d. Proposed measures to preserve or enhance wildlife, if
any:
Not applicable
6. Energy and Natural Resources
a. What kinds of energy (electrical, natural gas, wood
stove, solar) will be used to meet the completed
project's energy needs? Describe whether it will be used
or heating, manufacturing, etc.
Electrical. The telephone pole will require 20 -40 watt
service. There will initially be 12 directional antennas
7
located on the top of the pole. Electricity and
telephone service for electronic equipment will be
necessary.
b. Would your project affect the potential use of solar
energy impacts, if any:
No. The wooden telephone pole will not obstruct sunlight
from other structures.
c. What kinds of energy conservation features are included
in the plans of this proposal? List other proposed
measures to reduce or control energy impacts, if any:
None
7. Environmental Health
a. Are there any environmental health hazards, including
exposure to toxic chemicals, risk of fire and explosion,
spill, or hazardous waste, that could occur as a result
of this proposal? If so, describe.
No material that could cause fire or explosion are known.
Cellular radio power density levels are regulated by
government as a potential environmental concern. Radio
frequency emissions from the Allentown "cell site"
facility will be at 869 to 880 megahertz and 18 gigahertz
for the radio link transmissions to the mobile telephone
switching office in Seattle. The transmissions will be
low power with less than 45 watts for cellular radios and
0.1 watts for the 18 gigahertz radio link. As such, the
radio frequency power density levels near the cellular
telephone pole (10 feet above ground below the telephone
pole) will be extremely low and several magnitudes below
existing maximum permissible human exposure standards.
The maximum cellular radio transmission radio frequency
power density will be 1.3 microwatts per square
centimeter at the telephone pole base while the maximum
18 gigahertz radio link radio frequency power density
would be less than 0.0014 microwatts per square
centimeter. By comparison the recommended maximum
exposure levels by the Federal Communications Commission
and American National Standards Institute (ANSI) are
2,800 microwatts per square centimeter. King County, for
instance, has proposed a much more conservative standard
of 200 microwatts per square centimeter which still
exceeds the highest level emitted by the proposed
Allentown "cell site" by a factor of 154.
8
2
These very low power levels and ultra high frequencies at
which the "cell site" transmissions occur also eliminate
any potential for interference to other electronic
devices such as radio, television, VCR's, telephone and
medical devices such as pacemakers (which are internally
shielded by the manufacturers to withstand over 2,800
microwatts /sq. centimeter. This is born out by our
cellular telephone network which has experienced no
reported cases of interference to such devices. More
over, should any obscure circumstances result in
interference from the cell site transmissions the Federal
Communications Commission exercises absolute and
exclusive authority to require us to immediately correct
any such interference even if it means turning off the
offending transmitter.
1) Describe special emergency services that might be
required.
None required. Emergency services will be enhanced by
cellular phone service by providing emergency service
vehicles with mobile communications potential.
2) Proposed measures to reduce or control environmental
health hazards, if any:
None are anticipated to be necessary.
b. Noise
1) What types of noise exist in the area which may affect
your project (for example: traffic, equipment, operation,
other) .
None. The existing noises will not affect this project.
What types and levels of noise would be created by or
associated with the project on a short -term or a long-
term basis (for example: traffic, construction,
operation, other)? Indicate what hours noise would come
from the site.
There will be some traffic noise associated with the
installation of the cellular telephone pole and
electronic equipment vault which will occur during the
four to six week construction period. Minimal noise
impact shall be generated by the cell site and would
consist of twice monthly maintenance visits and sound
from the air conditioning units in the electronic
equipment vault.
3) Proposed measures to reduce or control noise impacts, if
any:
9
Hours of construction will be limited to between 7:00 AM
and 7:00 PM, Monday through Saturday.
8. Land and Shoreline Use
a. What is the current use of the site and adjacent
properties?
The property currently contains approximately 1/3 of an
existing house on the northern property line. The
remainder of the property is a vacant lot.
North - single family home
South - single family home
West - single family home
East - Northern Pacific Railroad right -of -way
b. Has the site been used for agriculture? If so, describe.
No
c. Describe any structures on the site.
The southern 1/3 of an existing single family home.
d. Will any structures be demolished? If so, what?
No
e. What is the current zoning classification of the site?
M -2 (Heavy Industrial)
f. If applicable, what is the current comprehensive plan
designation of the site?
Heavy industrial
g. If applicable, what is the current shoreline master
program designation of the site?
Not applicable
h. Has any part of the site been classified as an
"environmentally sensitive" area? If so, specify.
No
None. This site will be unmanned. Semi - monthly
maintenance visits will involve one person.
•..
i. Approximately how many people would reside or work in the
completed project?
10
Approximately how many people would the completed project
displace?
None
k. Proposed measures to avoid or reduce displacement
impacts, if any:
None
1. Proposed measures to ensure the proposal is compatible
with existing and projected land uses and plans, if any:
The immediate surrounding land uses to the west, north
and south are single family residential houses. However,
approximately 100 feet to the northwest on 51st Place S
is a construction company (see photos) . Along the eastern
side of the site is located the Northern Pacific Railroad
Trucking Company (see photos). The pole and equipment
vault would be compatible with these uses. Wooden
telephone poles presently exist in the immediate area of
the site. The cellular telephone pole would be
compatible with these existing poles. The site will be
located at the rear of the property as far away from the
single family residences as possible. An existing 15'
high embankment will be located along the eastern side of
the site and further help to minimize the visual impact
of the site. Landscaping will be added to the perimeter
of the site to help buffer and screen the electronic
equipment vault and base of the telephone pole.
9. Housing
a. Approximately how many units would be provided, if any?
Indicate whether high, middle, or low- income housing.
Not applicable
b. Approximately how many units, if any, would be
eliminated? Indicate whether high, middle, or low- income
housing.
Not applicable
c. Proposed measures to reduce or control housing impacts,
if any:
Not applicable
10. Aesthetics
a. What is the tallest height of any proposed structure(s),
not including antennas; what is the principal exterior
building material(s) proposed?
11
The height of the temporary telephone pole will not
exceed 100'. The telephone pole will be treated wood.
Located at the top of the wooden telephone pole will
initially be 12 directional antennas which will not
exceed the top of the pole. The equipment vault will be
under 10 feet.
b. What views in the immediate vicinity would be altered or
obstructed.
None.
c. Proposed measures to reduce or control aesthetic impacts,
if any:
The structures will be setback from the road and as far
from any residences as possible. Vegetative screening
will be provided around the perimeter of the cell site
(just outside the proposed security fence). This
screening will conceal the fence, vault and base of the
telephone pole.
11. Light and Glare
a. What type of light or glare will the proposal produce?
What time of day would it mainly occur?
The height of the pole has been filed with the FAA and no
determination has been received. The telephone pole will
not be lighted unless required by state or federal
agencies. No other light will be generated by the
proposal.
b. Could light or glare from the finished project be a
safety hazard or interfere with views?
No
c. What existing off -site sources of light or glare may
affect your proposal?
None
d. Proposed measures to reduce of control light and glare
impacts, if any:
None are anticipated to be necessary
12
12. Recreation
a. What designated and informal recreational opportunities
are in the immediate vicinity?
Not applicable
b. Would the proposed project displace any existing
recreational uses? If so, describe.
No
None
c. Proposed measures to reduce or control impacts on
recreation, including recreation opportunities to be
provided by the project or applicant, if any:
13. Historic and Cultural Preservation
a. Are there any places or objects listed on, or proposed
for, national, state, or local preservation registers
known to be on or next to the site? If so, generally
describe.
None known
•
b. Generally describe any landmarks or evidence of historic
archaeological, scientific, or cultural importance known
to be on or next to the site.
None known
c. Proposed measures to reduce or control impacts, if any:
Not applicable
14. Transportation
a. Identify public streets and highways serving the site,
and describe proposed access to the existing street
system. Show on site plans, if any.
51st Place S, S 124th Street and S 122nd Street serve the
site. I -5 and Martin Luther King Jr. Way S serve the
area surrounding the site.
b. Is site currently served by public transit? If not, what
is the approximate distance to the nearest transit stop?
Not applicable
c. How many parking spaces would the completed project have?
How many would the project eliminate?
The project will provide one parking space for the semi-
monthly maintenance visits. These maintenance visits
will require one car to be parked in the proposed parking
area with no adverse impacts.
13
d. Will the proposal require any new roads or streets, or
improvements to existing roads or streets, not including
driveways? If so, generally describe (indicate whether
public or private).
g.
b.
No
e. Will the project use (or occur in the immediate vicinity
of) water, rail, or air transportation? If so, generally
describe.
The site will not require these transportation means.
There is an existing Northern Pacific Railroad right -of-
way to the east of the site.
f. How many vehicular trips per day would be generated by
the completed project? If known, indicate when peak
volumes would occur.
One vehicle semi - monthly.
Proposed measures to reduce or control transportation
impacts, if any:
None will be required as a result
proposed construction.
15. Public Services
a. Would the project result in an increased need for public
services (for example: fire protection, police
protection, health care, schools, other)? If so,
generally describe.
No. The electronic equipment vault is unmanned with self -
extinguishing fire protection (halon system). The
equipment shelter and pole are alarmed and monitored 24
hours a day 7 days a week by an operations center.
Proposed measures to reduce or control direct impacts on
public services, if any.
None are anticipated to be necessary.
of low impact by
16. Utilities
a. Cir - tilities currently available at the
natural gas,
telephone, sanitary sewer, septic system, o her.
b. Describe the utilities that are proposed for the project,
the utility providing the service, and the general
14
construction activities on the site or in the immediate
vicinity which might be needed.
Electricity - Puget Power
Telephone - U. S. West Communications
C. SIGNATURE
The above answers are true and complete to the best of my
knowledge. I understand that the lei agency is relying on them to
make its decision.
Signature: Lim 4
Date Submitted: ///2/9/
2.0
ALP 9208 -N
LOGPERIODIC REFLECTOR ANTENNA
92 Degrees 8 dBd
10
Features:
❑ Broadbanded. (800 -900 MHz)
❑ Low backlobe radiation. Front to back
ratio better than 30 dB.
Low intermodulation products.
❑ Low wind -load.
Li Low weight.
❑ Small size.
❑ Rugged design.
Please see the following pages including radiation
patterns for ALP 9208 -N.
Electrical Specifications:
Frequency range: 806 -896 MHz
Impedance:
Connector:
VSWR:
Polarization:
Gain:
Front to back ratio:
Intermodulation: (2 x 25 W)
Power Rating:
H- Plane: -3 dB
E- Plane: -3 dB
Lightning Protection:
TYPICAL VSWR
50 Ohm
N female
Typ. 1,3:1 max 1,5:1
Vertical
8 dBd
>30 dB
IM5 - 107 dBm
500 W
92°
28°
DC Grounded
FREQUENCY (MHz)
800 820 840 860 880 900
Mechanical Specifications:
Overall height:
Width:
Depth:
Weight including brackets:
Rated wind velocity:
Wind Area (CxA/Front):
Lateral thrust at rated wind:
Worst case
Materials:
Radiating elements:
Element housing:
Reflector:
Mounting Hardware
clamps:
bolts:
25.2 in. (640 mm)
12.2 in. (310 mm)
11.8 in. (300 mm)
15.7 lbs (7.1 Kg)
113 mph (180 Km /h)
2.5 sq.ft (0.25 sq.m)
248 N
Aluminum
Grey PVC
Aluminum
Hot dip galvanized steel
Stainless steel
RADIO SIGNAL STRENGTH COMPARISON
leviBi
SIGNAL STRENGTH
(MICROWATTS PER SQUARE CENTIMETER)
American National
Standards Institute
Safety Standard
New Home
Microwave
RZA
Via;
RITTENHOUSE -ZEMAN & ASSOCIATES, INC.
Geotechnical & Environmental Consultants
1400 140th Avenue N.E.
Bellevue, Washington 98005 -4594
(206) 746- 8020 /FAX (206) 746 -6364
3 January 1990 W -7341
Cellular One
101 Elliott Avenue, Suite 435
Seattle, Washington 98109
Attention: Mr. Dave Ruggi, Project Manager
Subject: Limited Geotechnical Engineering Study
Proposed Communications Tower, Allentown Site
Tukwila, Washington
i 94
Gentlemen:
This letter presents the results of our Subsurface Exploration and Limited Geotechnical
Engineering Study conducted at the above referenced project. This scope of work is
limited to design recommendations for drilled piers for the tower, and foundation support
for the modular building, per our proposal, P -3329.
Authorization to proceed with this study was granted by Mr. Dave Ruggi of Cellular One
on 18 December 1990. This report has been prepared for the exclusive use of Cellular
One, and their agents, for specific application to this project, in accordance with
generally accepted geotechnical engineering practices.
SITE AND PROJECT DESCRIPTION
The site is presently a vacant lot located between 12224 and 12234 51st Place South,
Tukwila, Washington as shown on the Site Vicinity Map, Figure 1. To the eat of the site
is approximately a 4 to 10 foot high embankment with trailer parkin j located on top of
the embankment. The site was generally vegetated with weeds with some bushes.
Along the fence line located at the eastern property line were blackberry bushes. We
understand that at this time a 100 foot wooden monopole is to built on the site, with a
small equipment building.
Cellular One
3 January 1991
W -7341
Page 2
SUBSURFACE CONDITIONS
One test boring was advanced a total depth of 33 -1/2 feet on 2 January 1991. The
location of the boring is approximately as shown on the attached Site and Exploration
Plan, Figure 2. Drilling was performed using a hollow stem auger and samples were
obtained by using the Standard Penetration Test Procedure as determined by ASTM:D
1586. The samples collected were taken to our laboratory for visual classification. The
log for this boring is presented at the end of this letter report. The soils at the boring
location consisted of approximately 1 foot of topsoil underlain by approximately a 6 foot
layer of medium stiff, sandy silt. Below the sandy silt layer was generally a sand with
some silt with silty sand seams. This layer was very . loose from approximately 7 to 11
feet, grading to medium dense to a depth of 16 feet then grading to dense from 16 feet
to the bottom of the boring at 33 - feet. Groundwater, at the time of exploration, was
observed to be at approximately 7 feet. Groundwater levels may vary with changes in
precipitation, season, site usage, and other factors.
CONCLUSIONS AND RECOMMENDATIONS
The proposed project presently consists of a 100 -foot wooden tower located just south
of an existing residence at 12224 51st Place South in Tukwila, Washington. The
subsurface conditions disclosed by our borings are adequate for supporting tower
foundations and a small equipment building. We recommend utilizing an allowable
bearing pressure of 1500 pounds per square foot (psf) for foundations bearing directly
upon the undisturbed, native medium stiff sandy silt to silty sand. A minimum
embedment of 18 inches below ground surface is recommended for frost protection.
We understand that the foundation for the tower may consist of a drilled pier in order to
provide uplift and horizontal resistance. We recommend that the drilled piers be
embedded at least 10 feet below ground surface. For vertical loading, the
recommended value for bearing capacity is 0.9 D /B, in tons per •square foot (tsf) for
piers embedded from 10 to 17 feet deep, where D is the embedment depth (in feet)
below 10 feet and B is the diameter of the pier in feet. For piers embedded below 17 feet
a bearing capacity of 1.8 D/B tsf may be utilized. The ultimate end bearing capacity for
the pier embedded below 17 feet Is 17 tsf for piers embedded at least 8 pier diameters
below 17 feet.
Cellular One W -7341
3 January 1991 Page 3
For frictional resistance, acting both downward and in uplift, we recommend using an
allowable skin friction of 0.03 tsf for the upper 10 feet, 0.07 tsf from 10 to 17 feet deep
and 0.13 tsf from 17 to 35 feet. The frictional resistance applies to that portion of the pier
embedded below 3 feet. Due to the water table, the pier should be designed to
withstand hydrostatic uplift pressure from 7 feet below ground surface.
For lateral pressures, we assume the pier would be relatively rigid and would act as a
pole. Interaction between a pole and the soil is complex and may be modelled by elastic
methods. The passive pressure approach presented herein is more straight forward and
is conservative by neglecting redistribution of vertical stress and shear at the pier bottom
and below the point of fixity, which would likewise serve to resist lateral loads. We
therefore recommend using an allowable passive pressure of 175 pounds per cubic foot
(pcf), expressed as an equivalent fluid weight, acting over 2 pile diameters wide and 8
pile diameters deep, neglecting the uppermost 3 feet of embedment below the ground
surface. According to NAVFAC Design Manual 7 -2, a lateral deflection equal to about
0.02 times the pier length would be required to mobilize the allowable passive pressure
presented above. Higher deflections would mobilize higher passive pressure. A factor
of safety with respect to ultimate available passive pressure is greater than 1.5, which is
commonly applied to transient or seismic Toads.
Due to the relatively shallow water table and the loose nature of the upper sands, we
anticipate a drilled pier hole would be highly susceptible to caving. The hole would also
be susceptible to bottom disturbance from the high water table in the sand. For these
reasons, we anticipate that the pier hole will need to be cased for the majority of its
depth. No more than about 1 inch of sloughed material should remain in the hole prior
to concrete placement. Water or an appropriate slurry mix should be maintained within
the casing to prevent bottom heave. The concrete would need to be tremieFI to prevent
segregation. We recommend we be contacted to review any, altdrnative construction
methods proposed by the contractor.
Cellular One
3 January 1991
We trust this letter is sufficient for your current needs. We will be able to r =view the final
pier design using the above parameters or to refine these estimates base • on specific
pier diameters and lengths, as well as provide construction observation s= rvices and to
answer any questions you may have.
Respectfully submitted,
RITTENHOUSE -ZEMAN & ASSOCIATES, INC.
Larry A. Boge, P.E.
4-
Project En • ineer in -\
'J ames S. Dransfi Id P.E.
Associate
Enclosure: Figure 1 - Site and Vicinity Map
Figure 2 - Site and Exploration Plan
Boring Log B -1
W -7341
Page 4
N I
:
H 1ST
ST I a
ST' v1
. e
11 S
1 14TH
• ASS `2
ILL,s S 4
fL
$ r
S 1n x
HAZEL
FOUNTAIN ST
•
LEO
SI O11
.. 0
S 1n PR
N
Q _ 4
AVDN
S .
7 CA 1-- i- •
WA LACE
S Z t P �
S
C CI
L.
11901 S
JUNIPER
'P (5 9'I• 121ST ST
C Ul
Sr
10 tp
PREN
NTIC
a
9� '
T
p 0
L4 9L
S c •. "
L LP
112111 ST
i
S 116TH ST
ST
5 >♦8TU_ _ T
.f in ,Y f
N
I >
120TH S 4
(A ,1 ../''''^ '^
.,
H
> 1 J •T.1
S 12111
N A
174TH
rn
i • tD , ST S $
H ZEL
'Cl S EASTWOOD iA
D6 FOUNTAIN
T
ST
S11B'H PL
0
1 D S.
S. 110TH S
T.
1D s
S 11STH ST
S 1 6TH
ST
s
lP1
I'
9
0 � A v/ ;4.
V
to =
.'•
4
N
5•
5
„ '
1�
T tN
7lTlr N :1
SS130111 r.
4 ' ! $ ,
I •A
Q,Q S
S 114TH
11STHU1
S
F 5
S v
S
1 H
1741/14 SI >
PL SCI
TUN
q x
RD
L A HG ST ON
t325,
sr I7.sT ,
SI 4
113TH
ST '
S //s
5 II TN
.
I
Q
12
S 12216
In
o
117TH •-
EI•
S
UI
11TSN
T•
S 130 ' 101 ST
0 _�S I S e
2 IS ST)l
Iy7D STS I 133
SW
O •
R s'
R 1
II
.
"MAWS
1 170TH 'PARK .0414
U . 'E ' 4? S
S
ST
15 a
118TH-
•' 177700
ST S
, (( nrll,)S
124TH
I
I G IT
all
I
: f Nr 0
H H ST Nr
m A 70T
SSV
I
123N ST
123RD PL
lib. IR
a
N
Alf
STm
c s BONG v S
-1
S
m
, D S GA LEI
7C
Z : rei; YT sr. .
'n 1 S VICIOUS
I
IL. W �� �
111111N11
I I
CO 4 J 1 07TH
U'
116TH
STN sT
1 22 "
ST
SITE
A•LlHG roN
' ARP - _
•
U7
i
•
I.
S14611i ST
a
rS
A
I '
•
RUGGL S
CRESTON
S
BA
T In k •. S
� ST
• .: S 124'$ ST
IP
S
144 II N•. 111
ST
S : (1N
1761
ST
9
h1 \ 0 2, � "r
• ILA 'c.
r of \ \(
4 �.
b,
N SI 1' '. , �
� .v>. • ER.
l In 8 n
J .:7 .000.::-:
p.
I WI 5
AL
N
c.;\
Egli k I In ` • t
m
ST AIL SVNNYCH 4F
0
V
?Ij lNK� fir`.
144
+i
•
ao
. X,-7;45- 4 0
PL
N ST
ANLJ
�.
• • )
.
711 H
/VG
115TH
ern
1439
Pt
J
0
0
0
SE
0
•
° -Y
S 1351! '347. 4 •
S 174TH ST JR W O I
• I BLAtIFl.. - =f 7- /
I
i' .. . ) " °11‘--
� t EARLI
\ RIVE'
W
I
.3
to
N
•
T1
>
4r,, 4
ST
SI
14,
132ND ST ` ^ ••r
( J
ti C
v ° li b
ti
ST
i
Ill
T
SUN
TOWs,„
•
PL
•
NY
et
•
OI .•
NV
2ND
a
1 2NO
SF
JR HS
I It
"IAuI
I•
PIL
IT (*NT . \ \�
OA IIK% 1
W.O. W -7341
BY LAB
DATE JAN 1991
SCALE N.T.S.
to
a
U1
N
TTra s -li i n
1
V
"
RITTENHOUSE -ZEMAN &
ASSOCIATES, INC.
Geotechnical & Environmental
Consultants
1400 140th Avenue N.E.
Bellevue, WA 98005
N
co
SI
NW
2
4i
NM 5
7%
CELLULAR ONE - ALLENTOWN
SEATTLE, WASHINGTON
VICINITY MAP
FIGURE 1
RZA
APPROXIMATE
PROPERTY
LINE
'-- 120'
12224 51st PLACE SOUTH
LEGEND
W W -7341
BY LAB
DATE JAN 1991
SCALE N.T.S.
—75'
EXISTING
FENCE
B -1 NUMBER AND APPROXIMATE LOCATION
• OF BORING
,
CELLULAR ONE - ALLENTOWN
SEATTLE, WASHINGTON
SITE & EXPLORATION PLAN
FIGURE 2
RITTENHOUSE -ZEMAN & RZA
ASSOCIATES, INC.
Geotechnical & Environmental . WV V
Consultants : NOV
1400140th Avenue ME.
' Bellevue, WA 98005
Topsoil, roots and organics
-
-10
•
- 15
_
-20
-25
-30
I
4�
i
7a
_
—
—
--
—
--- --
—4
--
----
--
_-
- -
i
- - °°
---
Medium stiff, brown, mist to wet, sandy SILT
--
. -...
__._..
. .... ._._
.____
___
___
_._._.
_._.
Very loose, brownish -gray, saturated, SAND with
some silt
____
I
__
—
_
�-
--
_
--
- —
Medium dense, gray, saturated, SAND with some
silt
'—"'
""-'
�__
__
_�
__
"—
....—
—' `
__._
"-
—.
'"—'
—_
_._.__
.__-
- Dense, gray, saturated SAND with some silt to
silty SAND
_
_
- -..
.—
_
_ _.
_
_
___
•
---
- --
;
-
- --
Total depth 33' feet.
- Completed 2 January 1991.
35
40
•
RZA
r RITTENHOUSE -ZEMAN & ASSOC., INC.
� � Geotechnical / Environmental Consultants
SOIL DESCRIPTION
SAMPLING
I 2' OD SPLIT SPOON SAMPLE
]E 3' OD SHELBY SAMPLE
® 2.5' ID RING SAMPLE
B BULK SAMPLE
CIF SAMPLE NOT RECOVERED
N
o. m
IN g
2
0..
2
h
GROUND WATER
WATER LEVEL
AT TIME OF DRILLING
BORING NUMBER B W O. W -7341
PROJECT NAME Cellular One, Allentown
1 o - O
o 3
SEAL
DATE
STANDARD PENETRATION RESISTANCE
• BLOWS PER FOOT
(140 lb. hammer. 30 Inch drop)
0 10 20 30 40
OBSERVATION
WELL TIP
LABORATORY TESTS
• % WATER CONTENT
NP NON PLASTIC
•-1 -- LIQUID LIMIT
6 "— NATURAL WATER
CONTENT
PLASTIC LIMIT
50
BURIED UTILITIES IN AREA
CALLI BEFORE YOU DIG
1-800-424-5555
EiNCIWARKNOlnE:
32.60 = NOAA BENCHMARK #D 460 (SET BY NGS).
VERTICAL BRASS DISK 13 SOUTHWEST OF
THE SOUTHWEST RAIL OF THE NORTHEASTERLY
MOST "CHICAGO,MILWAUKEE, ST. PAUL &
PACIFIC RAILROAD" TRACK AND IN THE
NORTHEAST. FACE OF THE 2ND CONCRETE
PIER SOUTHWEST OF THE NORTHEAST END
OF THE 50TH AVE. S. OVERPASS,
\ •\
\
\
\ \
POWER POLE
\)‘
\
\ SET PK
\ EL=II.37
\ \
\
\
\
111 IIlI \
tP
c O cik
Vt.
Ili \
\ •
\-o
14"CEDAR
DRAINAGE
NTS
.
;"J
,
• , ••• •,
•';
•
0 • 0,0
I
1000
tise '
T T"
• • e 43 •
• 3 * ..
0' 42 •
• 4
c p ° 41
s
40
. ,
0 0
• 7
0
9. as
• 9
40 37
9 09
lb
. to
3 tp 3 • 5 •
• 11
34 •
• It
39 •
. 13 I .
1 32 •
• 14 i
e , 31 •
• ss
7•
• 16 '#
,of 9 .
t 7 t
2a 2,
4 `VI
4 I 8 ,..4
0 ,3
41. , .. L7 .
A-
/9
7.S
-7
LI
22 2.1
AS
24
• ("
t•s.
44 ,
MANZ=
t
EllaiiMileti
0' 42 •
ILIEVIACM111
40
IIIIIIMPAPRZ
MEP,
. ,
0 0
I , • 39 •
.„ ,i 33 •
4. 4t, 17 •
9
3t. •
IMP
I I
. la ,19 ,
gt 3 3 •
/3
32 .
111111P"Srriw°
3. .
•15 O
2
• 14
Ca In
7•
28
; 16 ,00
e.. .,
0 za 3
2. le 4 .
• 0.6° as 4
0
/9
7.S
Eo
-
t ,
. :7 44 2
2 0
t
• 3
0' 42 •
• 4 AO 0
40
i s - --
1) 40 •
6 41
01 39 8
EMI
.„ ,i 33 •
4 64$
0 3 •
E/ •
36 •
/ 35 •
•
• 11 Is 34 I
' a t
. 14
' /3 .
2
' 1
31 '
.... Is
3° '
' 10
2.9
0 za 3
2. le 4 .
• 0.6° as 4
0
/9
7.S
Eo
-
‘1
1S
ZS
ill 1 4 1 44 '
t z
Mil
4a
• 4 OM=
min
40
71114
122111111M13
EMI
37
' 9
WE
111:11ENIIIIM
IIIIKOMMI
. 13
SI •
. 14
PA 3 ' '
12101111
30
, 16
MUM
=MIME
io4
4
3 • tc
e 2 • '. 1 . 4
s 4' I , 0
9 • ' r e ■ • a b 3
' 9 .0 , ' S s , , A 4 1 • . ,5 3
3 I 9,? /4
4 . I , 3
*4 .' -
7 0 a 2
7 g
Q 0 /0
,, i £ . 0 - L
• En IIIIII
212111121 IIE 7 w IIMl
111MZ
1 • I 111101 EEila
IE
17 3
4 1 1 ' 1 1 I 3
I MM= 31111: 111
c.c. 1.11.01 .37
IL9.011 1 2.8
17.
le • 127... gP r,..
•
iklJi
FOR THE PURPOSE OF
ASSISTING - IN LOCATING YOUR
',PROPERTY AND NOT GUARANTEED
TO SHOW ACCURATE NEASURTENTS
19
iamtplitylipIpjilililliquittlyirtkump 1 ip
i ',kit
nimio isiewitzvempcee
;
ITURIM)111
tuans
4414.. •;
111 •. -
AFfItie
KING . COUNTY
'-.,DEPT.' •OF • ASS
\;
£4L6•f /. ah •3. tee SEATTLE
'sef�o-f•/sE N = _ 1317.
THIS YAP': IS rORt THE PURPOSE :OP
1 : A8S3ST1RO.TNLOCATIN O' Y O U R
PROPERTY ARD'18 NOT GUARANTEED
TO SHOT AOOURA1
•
.'� v .NM•LZ -3o6 -oi
1 1317.31
N- ' — .�- 1 sso- ee•sori
ff• ' 9e
ICI¢1
I 11.1lILI'IIppl�lll�TW!1l ll,111l
h�l � Tl /:1
13
� 6� 4
Xn.No.eo
sow. /3.23.4'
.Tao, UN6s7DN 4.5
heillanw
7T -L. J.Ns
%/6 2/e /O Ski./0 C�1
we.!•q•H