Hearings Officer Packet - 05/12/1983 - City of Beaverton . ''F' °Cii174�' 7�tfJMtkitileffiSIM
1640 HEARING OFFICER DECISION
5/83 City of Beaverton
'""' M 2-83
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• BEFORE THE HEARINGS OFFICER
FOR THE CITY OF TIGARD
IN THE MATTER OF THE APPLICATION )
FOR A SENSITIVE LANDS PERMIT TO No,
CONSTRUCT A SANITARY SEWER TRUNK )
LINE WITHIN THE 100-YEAR FLOOD )
PLAIN RUNNING PARALLEL WITH ) M 2-83
SUMMER CREEK; City of Beaverton, )
Applicant. )
The above-entitled matter came before the Hearings
Officer at the regularly scheduled meeting of May 12 , 1983 , at
the Durham Treatment Plant, in Tigard, Oregon, at which time
testimony, evidence and the Planning Department' s staff report
were received; and
The Hearings Officer adopts the findings and conclusions
contained within the staff report, a copy of which is attached
hereto and incorporated by reference herein and marked Exhibit "A" ;
therefore
IT IS HEREBY ORDERED
• M 2-83 is approved subject to the following conditions:
1. Upon completion of the project the channel shall be
restored to its original cross section and stabilized with rip rap
material as required by the City' s Engineering Division to prevent
erosion.
2. Prior to commencement of any site work, written veri-
fication shall be filed with the City from USA stating the capacity
I, of the pump station, how many households are served currently and
Page 1 - M 2-83
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how many households will ultimately be served by the Weir Trunk
Line.
`Xis_
DATED this , day of May, 1983.
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HEARINGS OFFICER
APPROVED] � ,
77_771 /.i
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BETE_ ON l NW ,--
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Page 2 - M 2-83
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STAFF REPORT
AGENDA ITEM 2.2
CITY OF TIGARD HEARINGS OFFICER
May 12, 1983 - 7:00 P.M.
DURHAM WASTE TREATMENT PLANT - CONFERENCE ROOM
Corner of S.W. Durham and S.W. Hall. Blvd.
Tigard, Oregon
A. FINDINGS OF FACTS
GENERAL INFORMATION
• CASE: M 2-83 Sensitive Lands Permit - City of Beaverton NPO # 7
• REQUEST: For a Sensitive lands permit to construct a sanitary sewer trunk
line within the 100 year floodplain running generally parallel
with Summer Creek. Approximately 500 lineal feet of sewer line
is within the Tigard Corporate limits.
RECOMMENDATION: Based on staff analysis of the technical information
supplied by the applicant and site inspection, staff
recommends Hearings Officer approval with the
conditions listed at the conclusion of this staff
report.
APPLICANT: City of Beaverton OWNER: Richard & Dolores Galbraith
4950 S.W. Hall Blvd. c/o Ann F. Norris, ET AL
Beaverton, Oregon 97005 6870 Portland, Avenue
West Linn, Oregon 97068
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LOCATION: West of SW 130th, south of SW Scholia Ferry Road,
(Washington County Tax Map 1S1 33D Tax lot 200. )
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LOT AREA: 11.84 acres
• COMPREHENSIVE PLAN DESIGNATION: Medium Density Residential
ZONING DESIGNATION: A-12
NPO COMMENT: No written comment had been received from NPO # 7 at the
writing of this report.
PUBLIC NOTICES MAILED: Notices were mailed to 26 surrounding property
owners on May 2, 1983. No written responses were
received.
BACKGROUND/PREVIOUS ACTION: On August 10, 1981 the City Council approved
a Comprehensive Plan change from R-7 to
A-12PD.
VICINITY INFORMATION: The property to the north is designated medium
density on the City 's Comprehensive Plan,
however, the property is primarily vacant.
't'"I' Summer Lake is to the east. The property to the
south is designated medium density on the
Comprehensive Plan, hut is undeveloped at this
time.
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SITE INFORMATION: The property is vacant and slopes towards Summer
• Creek. The area adjacent to the creek is
characterized by alder trees and thick undergrowth.
The remainder of the property is field grass. Summer
Creek bisects the property. The applicant proposes to
lay the sewer lineft-of Summer Creek.
elC it,
B. APPLICABLE LAND USE POLICIES AND STAFF ANALYSIS
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COMPREHENSIVE PLAN POLICIES:
2.1.1 The City shall maintain an ongoing citizen involvement program
and shall assure that citizens will be provided an opportunity
to be involved in all phases of the planning process.
All owners of record within 250 feet of this site received
riltice of the hearing in the mail. A public notice was printed
in the Ti`^,.i Times on May 2, 1983. In addition, NPO # 7 was
notified of th? application.
2.1.3 The City shall ensure that information on land use planning
• issues is available in an understandable form for all inti_rested
citizens.
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All interested parties are given 10 days at a minimum to comment
on land use planning issues and are encouraged to do so. In
addition, the planning staff is available to answer specific
concerns or questions indiviaivals may have concerning a land use
application.
3.2. 1 The City Shall prohibit any land form alterations or development
in the 100-year floodplain which would result in any rise in
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elevation of the 100-year floodplain.
3.2.2 The City shall:
a. Prohibit land form alternations and development in the
floodway, except alterations may he allowed which preserve
or enhance the function and maintenance of the zero-foot
rise floodway; and
b. Prohibit land form alterations or development in the
floodplain outside the zero-foot rise floodway except as
follows:
1. Land form alterations shall be allowed which preserve
or enhance the function of the zero-foot rise floodway.
3.2.3 Where land form alterations and development are allowed within
the 100-year floodplain outside the zero-foot rise floodway, the
City shall require:
The streamflow capacity of the zero-foot rise floodway be
maintained;
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b. Engineered drawings and documentation showing that there
will be no detrimental upstream or downstream changes in
the floodplain area, and that the criteria set forth in the
Sensitive Land section of the code have been met (See FIS
September 1971) ;
The City Engineer has reviewed the applicant's proposal and finds
that the installation of the sewer line will not raise the 100 year
floodplain elevation. The City Engineer also finds that installation
of the sewer line will enhance the function and maintenance of the
zero foot rise floodway. In addition, the City Engineer finds that
the stream flow capacity of the zero foot rise floodway will be
maintained.
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12.5.1 The City shall provide for the location of community facilities
in a manner which accords with:
a. The applicable policies in this plan;
b. The locational criteria applicable to the scale and
standards of the use.
(3) Site Characteristics
(a) The use shall be allowed provided:
(i) The unique natural features , if any, can be
incorporated into the design of the
facilities or arrangement of land uses ;
The applicant's proposal conforms to all applicable planning policies
and location criteria.
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APPLICABLE TIGARD MUNICIPAL CODE PROVISIONS:
18.57.010 Statement of intent. Sensitive lands are lands potentially
unsuitable for development because of location within the
one-hundred-year floodplain, within a natural drainageway,
or on sleep slopes. Sensitive land areas are designated as
such in order to give recognition to the need to protect
the public health, safety and welfare of the community
through the regulation and control of lands within
floo_dplains, drainageways, and steeply-sloping land areas,
and to thereby mitigate potential financial burdens arising
from flood damage loss and to preserve natural drainageways
from encroaching uses which threaten to affect. adversely
the property rights of the citizenry of the community,
public safety, and the public health by natural conditions
arising from upstream or downstream flood levels. City
actions under this chapter will recogr.ize the rights of
riparian owners to be free to act on the part of the city,
its commissions, respresentatives and agents, and
landowners and occupiers.
STAFF REPORT M 2-83 Page 3
Immmw
The floodplain district has for its purpose the
preservation of natural water storage areas within the
floodplain district by discouraging or prohibiting
imcompatible uses. (Ord. 79-73 Section 1 (part) , 1979:
Ord. 79-46 Section 1 (part) , 1979: Ord. 74-50A Section 1
(part), 1974).
18.57.020. Definitions. In this chapter the following words and
phrases shall be construed to have the specific meanings
assigned to them as follows:
(6) "Floodplain" means the relatively flat area or
lowlands adjoining the channel of a river, stream,
watercourse or other body of water which has been or
may be covered by floodwater within the area of
applicability defined by the floodplain district .
(7) "Floodplain district" means those areas within the
city of Tigard inundated by the one-hundred-year
regulatory flood.
18.57.040 Uses and activities allowed with a special use permit. The
following uses and activities are allowed only by special
use permit granted by the planning commission and based on
the standards set forth in Section 18.57.060:
(2) Within the floodplain/greenways only:
(A) Any temporary structure which by its nature
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cannot be readily removed from the floodplain
area during periods of flooding, and which would
impede or interfere with the flow of the
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floodwaters within the district ;
(S) Any changes in the topography or terrain which
would change the flow of waters during flooding
periods, or which would increase the flood hazard
or alter the direction or velocity of the
floodwater flew. (Ord. 79-73 Section 1 (part) ,
1979: Ord. 79 -46 Section 1 (part), 1979: Ord.
74-50A Section 1 (Part), 1974).
18.57.060 Special use permits. In accordance with the procedures and
requirements set forth in Chapter 18.84 of this code, an
application for a special use permit filed as by said
chapter stated may be approved or denied by the Hearings
Officer following a public hearing.
All applications for specail use permits shall be supported
/ by the following information to enable the Hearings Officer
to determine whether the proposed use is located in the
floodplain or drainageways district and if so, whether the
proposal, if approved, will conform to the purposes and
guidelines as set forth in this chapter.
STAFF REPORT M 2-83 Page 4
(1) Floodplain:
(A) Plans drawn to scale, submitted in triplicate as
prepared by a registered professinal engineer with
experience in hydraulic and geohydrologic engineering and
processes, showing the nature, location, dimensions,
elevations and topography of the site; the location of
existing and proposed structures located upon the site,
existing and proposed areas to be filled or otherwise
modifed, and the relationship of these to the location of
the stream channel, and proposed methods for controlling
erosiot .
(B) Any documentation, pl,otographs, water marks, and
similar evidence offered in support of the claim that the
site or area in question lies above high water as defined
by the regulatory flood.
The applicant's proposal will temporarily change the topography of
the 100 year floodplain- during the construction. The applicant ,
however, proposes to restore the topography to its original cross
section upon completion of the project. The applicant has submitted
sufficient information to reach a decision on the request.
18.57.070 Standards. (a) Application for a special use permit in
floodplain areas shall be granted or denied in accordance
with the following standards;
(1) No structure, fill, excavation, storage or other use
shall be permitted which alone or in combination with
existing or proposed uses would reduce the capacity of
the floodplain area or raise either the flood surface
elevation or flow rates, or adversely affect flow
direction on upstream or downstream properties, or
create a present or foreseeable hazard to public
health, safety and general welfare.
(2) The applicant must obtain the permit required by the
state of Oregon under ORS Chapter 541 for removal or
filling of waterways, or demonstrate that the
provisions of this statute do .got apply.
The applicant 's narrative (attached) addresses standards required for
action on Sensitive Lands Permit to allow fill and excavation within
the 100 year floodplain and the zero foot floodway. The City
Engineer has reviewed the applicant 's narrative and finds that the
proposal will not adversely impact runoff, erosion, ground stability,
water quality, groundwater level, flow rates, or flooding.
STAFF ANALYSIS AND CONCLUSIONS
After review of the technical data sumbitted by the applicant, it is the
opinion of the City Engineer and planning staff that the proposal will not
adversely impact runoff, erosion, ground stability, water quality,
groundwater levels, flow rates, or flooding. Further, it is staff 's
STAFF REPORT M 2-83 Page 5
opinion that the applicant 's proposal does not violate the intent of the
Sensitive Land Ordinance.
Staff recommends approval of Sensitive Lands Permit M 2-83 with conditions
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as follows:
1. Upon completion of the project the channel shall be restored to its
original cross section and stabilized with rip rap material as
required by the City's Engineering Division to prevent erosion.
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2. Prior to commencement of any site work, written verification shall be
filed with the City from USA stating the capacity of the pump
station, how many households are served currently and how many
households will ultimately be served by the Weir Trunk Line.
PREPARED BY: APPROVED BY:
I, lOfc T ..577//f-?
Eliz/—th A. Newton -William A. Monahan
Associate Planner Director of Planning & Development
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11111 STAFF REPORT M 2-83 Page 6
BEAVERTON April 21, 1983
City of Tigard
P.O. Box 23397
Tigard, OR 97223
Re: Weir Sanitary Sewer Trunk L. I.D.
Dear Gentlemen:
Enclosed is an application for permit duly accomplished and the required fee
in the amount of $500.00, The purpose of this application is to construct a
sanitary sewer trunk line which would run generally parallel with Summer
Creek. The project begins at the end of unified sewerage agency's line locat-
ed approximately 1400 feet south of the intersection of S.W. 130th P.od Scholls
Ferry Rd. It extends west and north with total sewer line of 25,000 lineal
feet to serge the the southwest corner of Beaverton.
For purposes of this application the total work within the City of Tigard
corporate limits is approximately 500 lineal feet of sewer line.
If you need further information, please call me at 644-2191, extension 241.
Very truly yours,
cp
I `/ 9-66,e/c)
M.L. "Bob4amola, P.E.
Project Engineer
• 0421-BT-L:dwh:29
Enclosure (1)
City of Beaverton • 4950 S.W. Hall Boulevard • Beaverton, Oregon 97005 • (503)644-2191
Statement on Project Purpe;e
Scope of Work and Conformance With
City of Tigard Floodplain and Drainageway Regulations
Related to Sensitive Lands Forms Permit Application for the Weir Trunk
Sanitary Sewer Local Improvement District, Beaverton, Washington County,
Oregon.
Applicant: City of Beaverton
I. Project Purpose
The Weir Trunk Local Improvement District is part of Unified Sewerage
Agency's Scholls Trunk Sewer plan. The Weir Trunk Sewer is designed to
serve approximately 970 acres of mainly residential zone properties in
the southwest area of Beaverton.
To serve these properties by gravity sewer, all lines must be located in
valleys or ravines and to generally parallel the natural ground drainage
ways. Engineering studies and design will be done by private consult-
ants. Construction of the project will be inspected and administered by
the City Engineering staff. When completed, all sections of lines that
are outside the City of Beaverton corporate limits will be owned and
maintained by the Unified Sewerage Agency and those lines that are in
the City of Beaverton corporate limits will be owned and maintained by
the City of Beaverton.
II. Scope of Project:
The project begins at the end of Unified Sewerage Agency's line located
approximately 1400 feet south of the intersection of S.W. 130th and
Scholls Ferry Road. It extends west and north following The Creek
Alignment with total sewer line of approximately 25,000 lineal feet.
The sewer lines will he reinforced concrete sewer pipe with sizes that
vary from 27" to 8" in diameter. All lines will be installed at a
minimum depth of 6 feet from existing ground.
For purposes of this application the total work within The City of
Tigard Corporate Limits is approximately 500 lineal feet of 27" se,
line.
III. Conformance with Washington County Flood Plain Di strict_ Regulations
The Weir Trunk Sewer will be constructed by the use of conventional
trenching and backfilling methods. The minimum workable trench width
will be specified. Any excess excavated material resulting from the
volume of earth displaced by the sewer pipes, manholes and bedding
materials will be removed and disposed of at a predetermined area
outside the flood plain. It will be specified in the contract that
contractor is required to maintain the surface of the backfilled trench
contractor is required to maintain thy, surface of the backfilled trench
at the same level as the existing ground adjecent to the trench.
Therefore, construction of the line will in na way alter the floodway,
floodway fringe and thus the physical character and capacity of the
flood plain as it exists will be preserved.
One of the considerations we have in mind for the design of the system
is the protection of properties from damage as a result of the design
location of the sewer, construction activities and timing of construc-
tion.
As stated previously, The Trunk Sanitary Sewer will generally parallel
the creek channel at a distance, which will alluw majority of
construction operations to proceed without causing damage or disturbance
to existing channel slopes or bend. Where the creek crosses the
channel , the channel will be restored to its original cross section and
stabilized with rip rip material as necessary to prevent subsequent
erosion. Also, the construction activities will be strictly limited to
the confines of the temporary construction easements.
IV. Drainage Impact due to future development.
The City of Beaverton development code requires detention facilities in
every development (see enclosed section of that code).
This requirement would maintain the amount of storm runoff the same as
it existed before development.
StofPur:BT:pta:28
Enclosure (1)
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RESOLUTION NO.
A RESOLUTION ESTABLISHING THE WEIR TRUNK
SANITARY SEWER IMPROVEMENT DISTRICT.
WHEREAS, pursuant to Resolution No. 2434 the City declared its
intention to establish the sewer improvement district and construct
the improvements referred to therein; and
WHEREAS, notice of said intention was given as required by BC
3 . 02. 015-. 020 , and a public hearing was held on March 21, 1983 , for
the purpose of giving all interested persons an opporunity to be
heardton the proposed improvements; and
WHEREAS, it appearing to the Council that the District should
be established; and
WHEREAS, the property within the District will be benefited to
the extent of the probable amount of the respective assessments to
be levied ; now, therefore,
BE IT RESOLVED BY THE COUNCIL OF THE CITY OF EEAVERTON,
OREGON:
Section 1. Establishment of the District.
A. Nature -t -he 7moroverent . The Council ^erebv esta-
blishes the Weir Trunk Sanitary Sewer Improvement District for the
' purposes of constructing main line sanitary sewers beginning at the
terminus of the Unified Sewerage Agency (USA) line at S.W. 130th
Street approximately 1 , 400 feet south of S.W. Old Scholls Ferry
Road, this point being referred to as point "A" , and extending
north and west following two primary drainage basins , one of these
basins dividing into three sub-basins, and further to acquire
- ight-of-way , 311 in accordance with the specifications of the City
RISO►,UTION NO. `/ ���
of Beaverton and USA with the work to be perf 'rmed by contract
with others.
B. Description of Lines. The actual alignment and length
of lines constructed will be determined upon final engineering.
The preliminaryscope of the project is described as follows:
P
Line I of the project includes the main line from point "A"
going west to a point referred to as point "B" approximately 400
feet south of Old Scholls Ferry Road and includes the section
extending north from the main line intersecting Old .7chclls Ferry
Road at a point referred as point "C" approximately 400 feet west
of the intersection of New Scholls Ferry Road.
Line II extends west and north from point "3" approximately
1, 600 feet, then divides into three sub-basins , the first extending
west approximately 3 , 300 feet , the second extending west °A
approximately 6 ,800 feet, and the third extending north and west
approximately 5 , 000 feet.
Line III extends north and west from point "C" approximately
5 , 700 feet.
Section 2. Estimate of Cost . The City Engineer has esti-
' mated that the total cost and expense of the improvement, which
shall include the actual expense of construction , engineering,
advertising , publication and mailing of notices, legal fees,
expense of apportioning the assessment and levying the liens and
all other necessary expenses , will be $1 , 330 , 000. The USA will
fund un to 50% of the actual costs attributable to rine I , up to 25%
of the actual costs attributable to Line II , and up to 25% of the
actual costs attributable to Line III . All costs not funded by USA
RESOLUTION NO. f - page 2
6t011" 'AP
will be assessed to the benefited properties as descried below.
This section does not guarantee USA funding, but only describes the
• maximuca, potential funding .
Section 3. Benefited Properties. The Council will assess
and impose a lien upon all the real property benefited by the
improvements for the total final costs of said improvements. The
. real property to be benefited by said improvements is determined to
be all of the real property shown on the attached Exhibit A.
Section 4. Method of Assessment of Cost . The actual costs
and expenses assessed against the real property benefited by the
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improvement shall be apportioned amongst the various parcels and
tracts .of land included in the district as follows:
A. All properties in the District will be assessed for Line
I. Only the properties benefited by the Line II lines will he
• assessed for those costs, and only the properties benefited by the
Line III line will be assessed for thoses costs. The assessments
• for each line will be calculated individually, then the assessments
resulting from each line will be totaled to arrive at the total
assessment for each parcel.
• B. The method of calculation of assessment for each line
• will be to multiply the acreage of the parcel, times a factor
representing the relative sewage production per acre of that
parcel, times the actual costs of line installed by this L. I .D.
required to serve the parcel. The product of the three factors
shall represent the relative share of the assessment for. a parcel
for a line compared to all other properties benefited by that ling.
C. The acreage to be used is the portion of the `ntal
?E$OLUTION NO. .,;"2 - page 3
rilirilir. . 0,
acreage of a parcel that can be served by a line to be constructed •
by this District.
D. The relative sewage production per acre shall be based on
current use, and if any parcel has no current use then by current
zoning at the time the District is formed, except when a use is
located on a property such that the remainder of the parcel can be
used at a different production rate without causing the removal of
the existing use, then the portion occupied by the current use will
be calculated P.s per its production rate, and the remainder of the
parcel by its zoning. For the purpose of these calculations a
zoning of R-7 (Beaverton Development Code) will be used' as the
:minimum density zoning.
v. The actual cogts of a line required to serve a parcel
shall be calculated as follows:
1. Parcels upstream of a line will be responsible for
the actual costs of the entire line or portion thereof required to .
`1' serve that parcel.
2. Parcels situated such that a line passes through the
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parcel will be responsible for the line from the downstream end of
:he line to the upstream point where it exits the parcel.
• 3. Parcels situated between the upstream and
'•• downstream ends of a line will he responsible for the line from the
downstream end of the line to a point on the line intersected Ly a
) gradient drawn from the corner of the parcel most distant from
, 2oint "A" , that gradient going downhill towards the line in a
iirection perpendicular to the topographic contours until it
Intersects the line.
it -tLSOLUTION NO. e: s/ '-/,'- - pace 4
Section 5. The City Recorder shall file a copy of this
Resolution in accordance with BC 3.02.095.
Adopted by the Council this „„7,(4f day of March, 1983 .
Ayes: a. Nays:
ATTEST: APPROVED:
z/Z L7119: 1'
MARY ,E. CX DER, City Record r J A R. NELSON, Mayor
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,:317,;T: OF ??a 'r aOY . 39. CERTIFICATION
"' IOII
CITY 07 3EAVEPTON. ;.
r. � � r>_ � _ i' Recorder for
• City t3.crton, ':ial.;::ir.-ton CJ':n�4
Y, UreSon,
certify t-`,2th' - :2nt Is
-s _�::r.:.. a c::R copy of
of 7.:13 C'f'_c131 records
of 1% "f E3a:'szt:.n. 0 eQ31.
:a :.=:3 �♦ �.I.a cz • r•r/ .3c4.-!" i9
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PESOLUTION NO. `,1 "1 ''
---- page 5
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I Sears, PROJECT
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provided in connection with fills.
D. Control of Excessive Runoff .
1. Where a one-half acre or larger site is involved, the
site drainage design shell provide for retention of storm waters by
use of impoundments that constitute an approved drainage device to
limit the amount of run-off to a rate not to exceed one-half inch
per hour for the entire site. Flat-roof buildings shall provide
rooftop catchments of three to three and one-half inches with a
maximum runoff of the entire roof area limited to one-half inch per
hour .
2. On sites of I as than one-half acre where flat-roof
buildings are constructed, the requirements of subsection D1 above,
as they apply to roofs, shall apply.
1 9 .05 . 140 Additional Safety Precautions. If at any stage of
work on an excavation or fill the city engineer determines by
inspection that the nature of the formation is such that further
\ work as authorized by an existing permit is likely to endanger
property or a public way, the city engineer may require reasonable
safety precautions as a condition to allowing further work to be
done. Safety precautions may include , but shall not be limited
to, specifying a flatter exposed slope, construction of addit*N a1
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drainage facilities , berms, terracing, compaction or cribbing.
9.05 . 145 Protection or Adjacent Public Property. No person
/ I shall excavate on land sufficiently close to the property line to
endanger an adjoining public street , sidewalk , alley or other
public property, without supporting and protecting them from
settling , cracking , or other damage that might result from the
3
6 '1 '52
Beaverton Code
property on which the excavation or fill is located or other person
or agent in control of the property, on receipt of notice in
• writing from the city engineer, shall, within one hundred eighty
days from the date of the notice, repair or reconstruct the
excavation or fill so that it will conform to the requirements of
this ordinance or otherwise repair, reconstruct, strengthen or
eliminate the excavation or fill in a manner satisfactory to the
city engineer so that it will no longer constitute a menace or
danger . A shorter period of time may be upecified by the city
engineer if an imminent and immediate hazard is found to exist. A
person receiving notice from the city engineer mai• .'rpeal from the
notice in the manner provided by BC 2. 05. 056 H to G.
9 .05 . 135 Drainage Reauirements.
A. Drainage generally. All graded sites shall be developed to
provide control of storm and surface waters . Adequate provisions
shall be made to prevent storm or surface waters from damaging the
face of an excavation or the sloping Face of a fill. All drainage
provisions shall be subject to the approval of the building
official and the city engineer and shall be designed to carry storm
and surface waters to the nearest practical street , storm drain, or
natural water course, approved by the city engineer as a safe place
to deposit and receive such waters .
B. Building Pad. Building pads on graded sites shall be
sloped at a minimum of two percent to the street or an approved
drainage device.
C. Subdrainage. When the build' ng official r.r the city
engineer considers it necessary, adequate subdrainage shall be