Agenda 01/10/2008 •
SPOKANE VALLEY PLANNING COMMISSION AGENDA
COUNCIL CHAMBERS -CITY HALL 11707 F. SPRAGUE AVENUE
JANUARY 10, 2008
6:00 To 9:00 PM
I. CALL TO ORDER
II. PLEDGE OF ALLEGIANCE
III. ROLL CALL
IV. APPROVAL OF AGENDA
V. APPROVAL OF MINUTES:
VI. PUBLIC COMMENT
VII. COMMISSION REPORTS
VIII. ADMINISTRATIVE REPORT
IX. COMMISSION BUSINESS
OLD BUSINESS-
NEW BUSINESS-STUDY SESSION, REGIONAL STORMWATER MANUAL
X. FOR THE GOOD OF THE ORDER
XI. ADJOURNMENT
COMMISSIONERS CITY STAFF
IAN ROBERTSON, CHAIR KATHY MCCLUNG, CD DIRECTOR
FRED BEAULAC, VICE-CHAIR GREG MCCORMICK, PLANNING MGR, AICP
JOHN G. CARROLL SCOTT KUHTA, LONG RANGE PLANNER, AICP
CRAIG EGGLESTON MIKE BASINGER, ASSOCIATE PLANNER, AICP
GAIL KOGLE CARY DRISKELL, DEPUTY CITY ATTORNEY
MARCIA SANDS DEANNA GRIFFITH
ART SHARPE WWW.SPOKANEVALLEY.ORG
,-�,r Spokane Regional
SPOKANE Cou'u
Stormwater Manual
SPOKANE _��`� - .. • r
IF '-' ‘i ' -'' 41.--- "---'71-7,..._:1- - ,, ..e,:!;.--._,' -
, .,u----
;s a.r .
I
4e
Stlitiene\ftl•
John Hohman,P.E.Senior Engineer
Valley Gloria Mantz,P.E.Development Engineer
Is Stormwater Management
T`1 Really Necessary in the
K6
spoREGa Valley?
•tet•
SPOKANE . my :: 144
pr;N
.y
Spokane'
,,Valley
1
: .- Valley Flooding
-
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?,, ,i'''.- fir'+ ' T. .F;' t - t,Vi;i^}4V.
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at,: .
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Spokan <;A _
_Malley
4
Background
SpoicK Cowry
0 Stormwater runoff flows into
drywells and swales
SPOKANE
p, i Valley soils are typically very porous
which allows quick infiltration
m Concern for contamination of the
aquifer which supplies our drinking
water
Spokane'
Valley
2
Typical Drywell
-- Installation
SPOKARE Co ,r
SPOKANE
1 ,, \1111 .-r.. icy.? 4 ; ____ry f ,y'
-
-:.±.1 ,:. ",moi-_„ ,'3_ x.,'2.1 -r. Z"*
rni.r
I ____...`:•.-.__L 1—�•_ Tr.;.. iii;is X.::..-,ad.1M -
jUalley
•
Typical Swale
SPoKARE Couru
„. r------ -
-AIL ..,
_,,.,. ...._ ,,,, .,i
,,,. .i,....,.„ :.,
. _ ;t.._ .,
3.
SPOIGINE - "$
u7.
IP 11
,,
•
I
°kane
jUalley • t 1 111100 -; a
6 , Spokane Regional
A ' �-r- Stormwater Manual
SPO�Cowr,
n The SRSM is a technical document used
to design stormwater facilities
SPOKANE
1,,,-,,,,i The SRSM establishes standards to
protect water quality, prevent flooding,
and protect natural drainage systems
n Meets criteria from Ecology's Stormwater
Management Manual for Eastern
Washington for discharges to
groundwater and surface waters
Wine
,,Valley
4,74 4 t, Why Update our Standards?
SPOKANE Caw
:i Better Organization
Existing document is difficult to use
SPOKANE Several amendments
I`�^��1 M. Outdated Methodology in the existing
.44 standards
' """ m Include Examples
tit Eastern Washington Manual (EWM)
Created by WA Dept. of Ecology
/\ n Spokane Valley Needs Equivalent
Spokane Manual
,,Valley
4
• r:: Why an Equivalent Manual?
SPUME COW!
■ State manual is for entire Eastern
Washington, not specific enough for
SPOKANEour Region
State Manual does not have guidance
X11„ for Conveyance Systems (pipes,
,t > >ttt
channels, etc)
m State Manual does not have examples
State Manual is difficult to use
City is required to adopt State manual
Spokane or an equivalent document
jUalley
L. . SRSM Background
SPOKANE COUNry
Developed by:
• City of Spokane Valley
SPOKANE I • Spokane County
• City of Spokane
,t ,t ,1 1
All three jurisdictions will adopt
e identical document
One manual for the entire region
Sane� will be beneficial for development
.Malley community
5
fit. I RSM Chronology
SPOK NT Cou'ui
Sept. 2003 - First Discussion of SRSM
PI Jan. — Oct. 2004 - Manual Rewrite by Spokane
SPOK�NE� County
p -.q Oct. 2004—June 2005 - Regional Group Meets
to go over Draft Manual
I July — Sept. 2005 - Public Participation Period
' ' ''"' el Oct. 2005-April 2006 -Additional Concerns
Raised by Regional Group
April 2006 — June 2007 - Technical Writer
Review and Edits
July 2005 — Oct. 2007 - Work with Ecology on
Equivalency
Spokane
�Ualley
;; ,. SRSM Leading the Way
ag
SPOK(N COt'Y
R In WA, only WSDOT has an equivalent
manual thus far.
1 oKaivEI ei Other jurisdictions are using our manual.
Central Oregon is in the process of
adopting a manual very similar to ours:
,,',';;`,'„ "Pioneering work was done in the State of
Washington resulting in the Eastern
Washington Stormwater Manual, and then
in the development of the Spokane
Regional Stormwater Manual. The
Spokane Regional Manual was the
s ��� starting point for COSM (Central Oregon
.valley Stormwater Manual)"
6
Public Participation
SPOKANE C011,6
6 public workshops at various locations
around the Spokane area
I Posting on the Spokane County & Spokane
sPOFiaNE Valley website
Newspaper notices in the Spokesman
lh� Review and Valley Herald
" ' Email distribution to neighborhood
representatives, engineers, developers,
etc.
Media releases
m Articles in the Spokesman Review
n Review by Washington State Department of
Spokane Community, Trade & Economic
1Ualley Development (CTED)
Applicable Regulations
sroKA E Cou,„
Underground Injection Control
POKaNE (UIC) Rule, Chapter 173-218
/ 1 WAC
Eastern Washington National
Pollutant Discharge Elimination
System (NPDES) Phase II
Municipal Stormwater Permit
1ne
Ualley
7
SPOKANE COugy
SPOKANE UNDERGROUND
INJECTION CONTROL
PROGRAM
(UIC)
SOlane
��lley
tria
UIC
SroKARECowry
UIC wells are used to dispose of
fluids underground. Examples
"F;01'<: '1\7 E include drywells, drainfields and
trenches with perforated pipe.
UIC wells have the potential to
contaminate groundwater.
The UIC program protects
groundwater quality by regulating
Spokan/�� the disposal of fluids into the
jUalley subsurface.
8
h , UIC Requirements
Seomg Cou c'
Two main requirements:
' POK N ' 1 . All owners must register wells
/P.1 with Ecology
2. All wells must meet the non-
endangerment standard:
➢ UIC well must be constructed,
operated, maintained, and
Spokanee decommissioned in a manner
��alley that protect water quality
What does w:JIC mean?
SPOKANE CO Nfl'
For existing drywells, owner (< 50
drywells) must:
SPOKANE
• Register existing wells by Feb
2009
• Complete a well assessment by
Feb 2011
• Any well found to pose a high
threat to groundwater must be
Spokane e' retrofitted or abandoned.
jUalley
9
What does UIC mean?
SPOKARE Ox
For owners of more 50 drywells.
(City owns 7,000+ drywells):
SPOKa\E
IrAl • Register existing wells by Feb
2011
• Complete a well assessment by
Feb 2013
• Any well found to pose a high
threat to groundwater must be
Spokane retrofitted or abandoned.
j�alley
What does UIC mean?
SPOKANECOWY
New drywells:
01(-kN I Must be registered 30 days prior
to installation
Must be designed, constructed
and maintained per the EWM or
an equivalent manual
Spokane
jValley
10
What are we doing to
&
'NM comply with UIC
Sower
et Worked to develop the SRSM
•POKANE1 Staff has made an inventory of
P 'I 2/3 of the City. Expect to
1h complete registration by 2009
m Development Engineering
informs engineer/developer of
registration requirements during
Sclan, permitting process
jValley
What else is needed for
q}�k UIC?
■
SPOKA[I COUt1tY
M Begin well assessment after
registration is completed.
so�;E Well assessment will identify
' drywells that need to be retrofitted or
,, ,>>,,, abandoned.
i Need to develop a public outreach
program to inform business owners
of UIC requirements for existing
/ . drywells
StioljValley
11
Questions?
S'OKAt Cam
SPOKANE' rip`
FM. •
L r
vu
Spokaanne
\alley
SPOKANE COY
SPOKANE
► ���
NPDES PII
'' „),” PERMIT
Spoliane
\alley
12
4,:', 4 ,, NPDES Phase II Perms
SPOKAK Cowry
Stormwater is the main contributor
to degraded water quality in urban
POK-1\EI settings.
/'-`1et imv
, surfacesDevlopmenthat increasecreates thepervolume
,, ,,, ,,\ and peak flow of runoff.
Sources of stormwater
contamination include land use
activities, operation and
maintenance activities, illicit
/� discharges and spills, and vehicular
Spokane traffic conditions.
j`alley
0.:24ku NPDES Phase II Permit
Se0KARE Cowry
...
_ , . „< ., ," ,.
: erruno may contain
POK •
ANE i or mobilize high levels of
/►— 1 contaminants,such as sediment,
�/;: suspended solids,nutrients
(phosphorous and nitrogen), iiiir
,\ , '' '' ' X heavy metals and other toxic '11„
,i- pollutants,pathogens,toxins,
oxygen demanding substances
(organic material)and floatables"
USEPA 1992,Environmental Impacts of Stormwater A National Profile
Spokane
Valley
13
gym . PDES Phase e II Permit
N
SrooARE Coin
National Pollutant Discharge Elimination
System (NPDES) - Federal Clean Water Act
SPOKANEPermit authorizes discharges to surface
and ground waters of the State
tit Permit regulates Phase II Communities,
which:
Own and operate a Municipal Storm Sewer
System
Discharge to surface waters
Are located in urbanized areas
Have a population greater than 1,000 and less
Spokane
than 100,000
,jUalley
Permit Coverage
Spowte Cowry
According to Ecology, the following
municipalities meet the established
SPOKANE criteria:
Cities and Towns: Asotin, Clarkston, East
Wenatchee, Ellensburg, Liberty Lake,
Kennewick, Millwood, Moses Lake, Pasco,
Pullman, Richland, Selah, Spokane, Spokane
Valley, Sunnyside, Union Gap, Walla Walla,
Wenatchee, West Richland, Yakima
Counties: Asotin County, Benton County,
Chelan County, Douglas County, Franklin
Spo e County, Spokane County, Walla Walla County,
�Ualley Yakima County
14
Requirements
1
Permit q
d�- /t SPOKANE cowry
P. Permit requires the development of a Stormwater
Management Program (SWMP)that involves the
following components:
SPOKANE 1. Public education and outreach program
r:q1
2. Public involvement/participation program
3. Illicit discharge detection and elimination program
4. Construction site stormwater runoff program
�i 5. Post construction stormwater management program
6. Pollution prevention/good housekeeping program
mi In addition to the above,the permit also requires:
1. Compliance with approved total maximum daily load
(TMDL)or water cleanup plan
2. Evaluation and assessment of project compliance
Spokane
jUalley
Public Education &
Outreach
sPoKAE cou<\uy
Develop a Public Education and
Outreach Program that
SPOK'�NE
1. Identifies target audiences
2. Informs public about the importance of
,';;,„ protecting/improving water quality,
eliminating illicit discharge, etc
3. Informs public and businesses about
preventing illicit discharges
4. Informs engineers, developers,
Spokane contractors, review staff about
jMalley technical standards and BMPs
15
Public Involvement and
. „Y% � Participation
SP°KmC&INN p
141 Develop a Public Involvement
SPOKANE
and Participation program that:
'1 1. Provides ongoing opportunities
for public participation
2. Makes SWMP available to the
public
$45kan
�Ualley
Public Involvement &
Participation
SvoKARE Cowry
.417
SPOKANE ,,�
Storm drain stenciling is one way the community can
Spokane participate in the stormwater program
jValley
16
Illicit Discharge, Detection
and Elimination
SPOKANE GOUTY
ei Develop an Illicit Discharge, Detection, and
Elimination Program by
1. Developing a map of the MS4(Staff has
SPOKANE completed this task)
^ 7' 2. Adopting a mechanism that prohibits illicit
discharges and authorize enforcement action
\-171
; 3. Developing an ongoing program to detect and
I>>11 address non-stormwater discharges to the
MS4, including spills, illicit connections and
illegal dumping
4. Informing staff, businesses, and general public
of hazards related with illegal discharges and
improper waste disposal
5. Training related staff
Spokane
Val ley The City is already doing these :";ems at leas:partially
Illicit Discharge and
��j Elimination
SPOKARECOURIY
SPOKANE — — 1
IFN •
•
•
SliQ Discharge of wash water from a car wash to stormdrain
do,Ualley
17
Construction Site
=- Fy Stormwater Runoff Control
SPOKAII Couvr
Develop and enforce a program to reduce
pollutants in runoff to MS4 from construction
activities.
I. Adopt a mechanism that requires erosion and
SPOKANE sediment control and authorize enforcement action
., 2. All construction operators shall prepare ESC Plan
and apply BMPs in accordance with Permit(SRSM
Manual provides guidance for compliance)
3. Adopt procedures for review of ESC plan
4. Adopt procedures for site inspection and
enforcement of ESC measures
5. All new construction sites that trigger regulatory
threshold shall be inspected at least once by
qualified staff.
6. Provide information to construction site operators
about related training
7. Adopt procedures to consider information provided
Spokane by the public
_Malley The City is already doing these items at least partially
Construction Site
Stormwater Runoff Control
SPOKA[\T Cowry
SPOKANE
Poorly maintained BMPs can result in significant
quantities of sediment discharged to storm drains
Valley
18
0 . Post-Construction
Stormwater Management
Slum Gamy
A Develop and enforce a program to reduce pollutants in
runoff from new development and redeveloment projects
1. Applies to all projects(even Capital projects)that trigger
i the regulatory threshold
SPOKANE 2. Adopt a mechanism that requires treatment,flow control,
IP and source control BMPs
3. Adopt requirements to ensure long term maintenance of
:41
the BMPs
4. Document how the required BMPs protect water quality to
> > the maximum extent possible unless a manual equivalent
to EWM is adopted
5. Adopt procedures for site plan review for required B1i1Ps
6. Adopt procedures for site inspection and enforcement of
post-construction BMPs
7. Provide training to staff involved in permitting,planning,
reviewing,inspection and enforcement
8. Keep records of all projects that trigger regulatory
/ threshold
Spokane 9. Provide training information to design professionals
,,Malley
The City is already doing these items at least partially
Post-Construction
-- Stormwater parti.-____ gementally
SPOKANE Cwry
•r, f
SPOKANE Qiol ,
te
SpokI
ane Lack of flood control can lead to flooding and erosion
,,Malley
19
Post-Construction
4 ; ,`A ' Stormwater Management
SPOKAK COU'tIY
_1
/- -
SPOKANE . .
-Wil
r:41
�,.�„� .ec F� 11
*Ole Swales help reduce stormwater runoff and provide water
jVdlley quality treatment
Pollution Prevention and
,: Good Housekeeping for
SpoKAEc Municipal Operations
et Develop and implement an operation and
maintenance (O&M) program that:
1. Includes appropriate source control BMPs in
SPOKANE accordance with EWA or equivalent manual.O&M
Plan shall:
Irla Develop inspection and maintenance procedures and
schedules for stormwater BMPs
r. Implement BMPs to treat pollutants from streets,
maintenance areas,and waste transfer stations
n Establish procedures for properly disposing waste
removed from MS4
El Identify ways to incorporate BMPs into new and
existing projects
2. Includes a schedule of inspections and establish
record keeping requirements.
3. Develop an employee training program for all
�� employees who work in construction,operations,or
�jmaintenance
Valley
20
Pollution Prevention and Good
. .., >. Housekeeping for Municipal
SPOKARECouo Operations
SPOKANE Tis ' 1
'ti. _
I 'I. III•„
4 i718ii
O„k e Pollutants in the stormwater system can be minimized by a street
Ualley sweeping and vactoring program
4 54
'11.; QUESTIONS?
SPOKAK COMFY
e sr• _
SPOKANE ;
,1 „1111 w
>MiIley
ne -a- - -yam �h�9r
-
21
PSR
'fir)ot
SPOKANE Cowry
SPOKANEIF :11 SPOKANE REGIONAL
STORMWATER
MANUAL (SRSM)
S.,.,k/�%
U 11ey
• SRSM Contents
SPOKANE Cou'UX
Chapter 1 Introduction
Chapter 2 Presents 8 Basic Requirements (BR) &
SPOKANEI Establishes Regulatory Thresholds
Chapter 3 Requirements for Drainage Submittal
(BR#1)
' ' " Chapter 4 Geotechnical requirements (BR#2)
Chapter 5 Hydrologic analysis
Chapter 6 Water quality treatment(BR#3)
Spokan�
.Malley
22
h
t' SRSM Contents
SPo,' Cony
Chapter 7 Flow Control (BR#4)
SPOKANE Chapter 8 Conveyance Systems (BR#5)
IPP- 4 I
��11��, Chapter 9 Erosion and Sediment Control (BR#6)
Chapter 10 Controlling Sources of Pollutants (BR#7)
Chapter 11 Maintenance Requirements (BR#8)
Spokane Appendices Design Examples
Walley
Y. , Changes with SRSM
SPOI:f+tE COUVY
Chapter 2 New Threshold Now Also Applies to:
'Projects Proposing UIC facilities
!sAll projects disturbing one acre or more
SPOKANE -All projects adding 5,000 square feet of
FNimpervious area. This threshold applies to the
total amount of new impervious surfaces added at
full build-out.
Chapter 4 'Removed references to pre-approved soils.
p Drywell disposal requires at least minimal level of
geotechnical work.
-Spokane 200 Method for drywell disposal.
Already in use.
Cha ter 5 'Rainfall intensities are calculated differently.
p Stormwater facilities are about 15-20 percent
Spokane smaller
Valley
23
• Changes with SRSM
SpoKANT Cows
Chapter 6 Continues the use of the new treatment method
p developed in 2005.This method has been approved by
EPA.
nAll projects proposing drywells are required to provide
"'1
SPOKANE treatment(UIC compliance).
nAll projects proposing drywells must register with
Ecology(UIC Compliance).
nDischarges to surface waters may require treatment for
, �,`` , metals and phosphorus.
,:1,, s.Projects with high traffic or that transfer oil/other
petroleum product require oil water separators.
nNew Treatment BMPs
*Bio-infiltration swales(only option currently)
*Biofiltration Channels
*Vegetated Buffer Strips
*Wetlands(must be approved by Ecology)
/\SiMane
4Ualley
: 1rt Changes with SRSM
,; gig.
SPOKANE Cowry
Chapter 8 sUpdated sizing methods to be consistent with
p WSDOT
Chapter 9 NProvides specific guidance for elements required
by the permit.
SPOKANE
IF -.11 Chapter 10 MThis entire Chapter is new and is required by the
permit. It requires that BMPs be implemented to
�1h1 prevent pollutants from entering stormwater to
, protect water quality of surface water and
' ' ' '>> grounwater.BMPs are for street maintenance such
as street sweeping and catchbasin cleaning.
•
SOokan
/e\
d'Ualley
24
50.
0 Commercial Project
Exam le
SPOT Coat p
1 ..
_
Existing Conditions include a — - Cr
building,paved parking area and _ - -- -`-"- -" -
gravel parking areas wM
Permit application to pave a
RIM'II! - -- ;"- .�
SPOKANE r r
portion of the gravel areas(<5,000 �"�.._' �F•J �j� !�` 1 .,�
�''II II sq.ft). The entire parcel is now (';�•"*�/ q ,�+
im ervious and over 5,000 s ware F :�/�`�
P q 1
feet. ., . — a
j 1\1 1 Treatment or flow control are not ;2, _. ,..
'1 ' +1,1 1 required now. Private runoff goes .., : `,4� i°'
to our ROW and drywell. ' 1 h- . v-",,
' : :
Private flow to public drywellA. �`j 1 IT 'T'f' F14
increases liability to the Cityy, C—
— With SRSM,applicant shall provide treatment and flow
011\.
control for new improved areas(if total developed area
(existing+proposed)is>5,000 sq.ft.
S 0 `nye, Flow control would require a swale and drywell onsite to
j Y alley treat additional runoff. UIC registration requirements
apply also.
Commercial Project
SPOT c�,-
Example
NEW REQUIREMENTS
n Owner shall register new drywells
SPOKANEI A Relationship between owner& Ecology is created
1 iZIN‘
1Project is required to provide treatment if a drywell is
proposed regardless of size of project
LI Project is required to provide flood control and
11',,1.,) treatment if constructs 5,000 sq.ft of impervious
area at full build-out(Currently is only if>4,999 sq.ft
per PERMIT)
n Eliminate piece meal projects that end up
discharging to public system
,,ne
Valley
25
A. ,'�, ,. Adoption Schedule
Sro�Cotte
Obtain SEPA determination with Spokane
County and City of Spokane with Spokane
SPOKANE County as the lead agency
` -.44 ; January 10, 2008 discussion with the
;1111 I Planning Commission
,,',';;\,',', January 24, 2008 public hearing with the
Planning Commission
m Hold a public hearing with City Council in
February 2008
il Schedule a meeting with City Council by
/� March 2008 with Staff recommending to
�Valley motion the adoption of the SRSM
A
. ' Title 22.150
SroKAII Co ,r
SPOKANE m Minor changes to Title 22.150
11'^' are necessary.
;,,,`,\ 1
*lune1)11
0
jUalley
26
ILI , Recommendations
SPOKW COUKFY
m Make minor changes to Title
22.150
SPOKNE
11 -- Adoption of the Spokane
\
Regional Stormwater Manual
,, ,
.1\....
SOOkane
. alley
5 4
f, ,
QUESTIONS?
SPOKANE Cou' •w
-,:..,"7, 111,.., -..-
SPOKANE .-,..' `....- -.•-•<. : ---s• '...:4--"Z.„.401111Irmita' • - - . ":"'"'
1 i.,- ----,----
F 0,-,4-q
iN
r
itft„, • ..
, \
-.•
i .
ol\44.,, w
SPOkane , ,
Valley
27
Uniform Development Code Title 22
22.150 Stormwater Management Regulations
22.150.010 Finding and Purpose
The increased flow of surface water from the use and development of real property within the City must
be managed to protect persons, property, and the environment. Stormwater facilities are a common
feature of urban development which must be constructed and maintained when property is developed or
redeveloped within a geographic area. The City shall implement policies and procedures to:
1. Minimize the degradation of water quality in surface and groundwater;
2. Reduce the impact from increased surface water flow, erosion and sedimentation caused by the
development of property;
3. Promote site planning and land development practices that are consistent with the topographical
and hydrological conditions; and
4. Maintain and protect public and private property that is used and dedicated for stormwater
management.
22.150.020 Regulated Activities
No person on any public or private real property located within the City, shall engage in the following
regulated activities without first obtaining stormwater control approval from the City. The regulated
activities for development are:
1. Grading of land in excess of five hundred (500) cubic yards so as to require environmental
review pursuant to the State Environmental Policy Act(SEPA);
2. Construction of, or addition to, a building (except a single-family or duplex residence) or
placement of impervious surfaces that exceed 5,000 square feet. For projects that are
implemented in incremental stages, the threshold applies to the total amount of impervious
surfaces replaced or added at full build-out;
3. Disturbance of one (1) acre or more;
4. The subdivision, short subdivision and binding site plan process as defined in RCW 58.17 and
SVMC Title 20, and
5. Construction of drywells or other UIC wells regulated by WAC 173-218 UIC Program.
22.150.030 Authority to Develop and Administer Standards
The DirectorDevelopment Services Senior Engineer shall develop and administer City Standards that
relate to best management practices and the threshold requirements for the development of stormwater
control facilities. The DirectorDevelopment Services Senior Engineer is further authorized to develop
policies that relate to the submission and modification of stormwater, erosion and sediment control
plans.
Requirements and performance standards that include best management practices shall be designed to
control and contain stormwater, reduce soil erosion and sedimentation through the use of temporary and
permanent practices and facilities. The requirements shall be designed to permit flexibility in the choice
of stormwater erosion and sediment control methods that meet the specific circumstances of each site
and intended use.
22.150.040 Standards for Stormwater Management
The City adopts. by reference. the Spokane Regional Stormwater Manual. as amended. Unless the
context requires otherwise. references to the local jurisdiction shall be construed to mean the City of
Spokane Valley. The City Clerk shall maintain a copy on file.
Draft January 10,2008
Page 1 of 6
Uniform Development Code Title 22
22.150.040050 Review Process
Following submittal of a request to engage in a regulated activity, the DirectorDevelooment Services
Senior Engineer shall review the proposed regulated activity including any plans or other submitted
material. The D+FectorDevelopment Services Senior Engineer shall determine whether the regulated
activity is exempt from review based upon the threshold requirements, or alternatively, whether the
regulated activity complies with the standards, specifications and requirements contained in the City
standards. The DirectorDevelooment Services Senior Ennineer may require the submission of additional
material and/or analysis to allow the proponent to demonstrate compliance with City Standards.
22.150.0500.0 Conditions of Approval
The DirectorDevelooment Services Senior Engineer is authorized to impose development requirements
or conditions of approval for the regulated activities. The stormwater requirements or conditions may be
placed on the subdivision, binding site plan, issued permit, or a recorded maintenance covenant and
agreement may be placed upon a parcel or lot where drainage facilities will be developed.
Conditions of approval shall be based on the City Standards, the preliminary Site Drainage Plan,
engineering reports or other relevant data that promotes stormwater control, protection of adjacent
properties, utilities or other stormwater facilities, slope stabilization and the environment.
The recorded covenant and agreement shall be in substantially the following form.
1. "Buyer is purchasing from Seller Lot Block in the final plat of
recorded in the records of the Spokane County Auditor on the_day of , 200 at
volume of Plats, Page , situated in the City of Spokane Valley,
Spokane County, Washington.
2. In accordance with thc final plat and the Conditions of Approval thereof, the above described lot
within the plat and from roadway and sidewalks adjacent to the plat.
irrigation system.
1. The Parties desire to provide for the perpetual maintenance, repair and replacement of thc
drainage swale and its irrigation system.
and watering the grass in the swale to keep the grass healthy and thc swale well kop in
app arance.
swale irrigation system in good repair and functional for its intended purpose.
drainage swale.
runoff from public right of way and conform to City access standards.
5. Buyer understands and agrees that if the drainage swale is not kept and maintained as
provided herein, the City of Spokane Valley may undertake said maintenance and repair and
charge Buyer for its labor and maintenance.
Valley."
Draft January 10,2008
Page 2 of 6
Uniform Development Code Title 22
The City may also enter into a development agreem nt with the person having ownership or control of
to omni 36 70Q 170 �t sc,
pursuant ,q
.
22.150.060 Design Elements
follows:
1. Continuous swales running the length of the street located between the curb and sidewalk.
3. Consolidated ponds or swales that are located on a separate tract or lot owned by a
developments.
22.150.070 Design Method
determine the size of the facility:
V- 1133 A, where
V- Volume of swale (cubic feet)
A - Pollution generation impervious surface (acres)
maximum depth of water in a swale for treatment shall be sir (6) inches.
Engineers designing drainage facilities located in non standard soils must submit a design deviation in
accordance with SVMC 22.150.080 and receive approval from the Director prior to utilizing the above
method in their design. Geotechnical justification will be required.
22.150.040070 Deviations and Appeals
1. Authority. The D+restecDevelopment Services Senior Engineer may grant a deviation from the
requirements of this ordinance or City standards. In granting any deviation, the
DirectorDevelopment Services Senior Engineer may prescribe conditions that are deemed
necessary or desirable for the public interest.
2. Deviation Criteria. No deviation shall be granted unless the applicant demonstrates, to the
satisfaction of the DirectorDevelopment Services Senior Engineer, the following:
a. Deviations are based upon sound engineering principles, best management practices
and are not inconsistent with the public interest in stormwater control and
environmental protection;
b. The granting of the deviation will not be unduly detrimental or injurious to other
properties in the vicinity and downstream;
c. The proposed deviation does not conflict with or modify a condition of approval; and
d. Deviations meet requirements for safety, function, appearance, and maintainability.
3. Prior approval. Any deviation shall be approved prior to acceptance of residential and
commercial construction plans and issuance of any building, approach, or site work permits.
4. Right of appeal. All actions of the DirectorDevelopment Services Senior Engineer in the
administration and enforcement of this chapter shall be final and conclusive, unless within
Draft January 10, 2008
Page 3 of 6
Uniform Development Code Title 22
fifteen (15) days from notice of the DirectorDevelonment Services Senior Engineer's action, the
applicant or an aggrieved party files a Notice of Appeal with the Hearing Examiner.
22.150.090080 Stormwater Facility Construction and Certification
All stormwater facilities shall be completed and certified by the proponent's engineer prior to any final
plat, short plat, binding site plan, or the issuance of a permanent Certificate of Occupancy or final
inspection for any associated building. At the discretion of the DirectorDevelopment Services Senior
Engineer, a test of the facility may be performed to demonstrate adequate performance. The test shall
be performed in the presence of Development Engineering personnel.
Acceptance of performance sureties, in lieu of completed improvements, shall be permitted only when
completion of improvements prior to final land action or permanent Certificate of Occupancy is
impractical (i.e., due to construction season delays or other factors beyond the proponent's control).
In the event that a performance surety is accepted by the DirectorDevelopment Services Senior
Engineer, the proponent will complete the following measures prior to the release of the surety:
1. All aspects of the drainage facility, including landscaping, irrigation, and establishment of
specified vegetation, shall be completed in accordance with the accepted plans on file with the
City. The proponent's engineer shall certify the improvements and request an oversight
inspection from Development Engineering personnel.
2. An exception may be granted for single-family or two-family residential subdivisions where the
completion of the swales is not practical until such time as the dwellings are constructed. The
proponent shall rough-grade the swales to the required volume and install all drywells, inlets,
curb drops and other structures in accordance with the accepted plans on file with the City.
Erosion control measures shall be implemented to protect the installed drainage structures and
to prevent erosion and/or failure of the swale side slopes. This includes, but is not limited to,
lining the swale with geo-fabric that can be removed along with accumulated silt, until the swale
is final-graded and vegetated. The completion of the landscaping, irrigation, and establishment
of specified vegetation shall be required prior to issuance of the permanent Certificate of
Occupancy or final inspection for any associated dwelling.
A warranty surety shall be submitted to the City upon successful completion and certification of all
public improvements to guarantee against defects in construction. The warranty surety will be for a
period of two (2) years from the date the facility is accepted by the City.
22.150.1-00090 Inspection
The DirectorDevelopment Services Senior Engineer is authorized to field inspect, as appropriate, street,
building site, and drainage construction to verify conformance with City standards and the conditions of
approval.
Draft January 10,2008
Page 4 of 6
Uniform Development Code Title 22
22.150.440100 Property Owner Responsibilities
1. The property owner shall comply with provisions of this section and City standards. The
property owner shall be responsible for repair, restoration, and perpetual maintenance of the
stormwater facility installed on private property and any portion of the swale situated in a public
right-of-way adjacent to their respective properties.
2. For purposes of this chapter, "repair and restoration" shall mean conforming the stormwater
facility to the plans on file with the City. This responsibility to repair, restore and maintain shall
be imposed without regard to any fault or wrongful intention on the part of the property owner.
a. Maintenance means preservation of the original area, volume, configuration and
function of the stormwater facility as described in the plans.
b. Maintenance also includes mowing, irrigating, and replacing when necessary, the lawn
turf within the swales.
The property owners within single-family and two-family residential subdivisions are not
responsible for maintenance of structures such as drywells, inlets, and pipes that receive
runoff from public right-of-way and conform to City access standards and are located
within the public right-of-way or a border easement dedicated to the City. The City of
Spokane Valley will maintain the drywells, inlets and pipes upon acceptance of the public
infrastructure.
3. The property owner is responsible for keeping open the drainage and stormwater easements
on their property. If a drainage or stormwater easement is unlawfully encroached upon or the
function of a designated drainage or stormwater easement is reduced, the property owner is
responsible for removing the encroachment or detriment.
4. The property owner is responsible for keeping open maintenance access easements serving
drainage facilities and drainage easements.
5. The property owner shall not place or permit, and shall immediately remove, vehicles,
equipment, objects, refuse, garbage or litter from the stormwater facility.
22.150.1-20110 Public Drainage Facilities
It shall be unlawful for any person to throw, drain, pour or otherwise discharge unauthorized waters or
other liquids onto City property, rights-of-way, or border easements, without written permission of the
DirectorDevelooment Services Senior Engineer. For purposes of this chapter, unauthorized waters
include, but are not limited to:
1. Groundwater from springs or other natural or artificial sources, foundation drains, sump pumps,
and other means of discharging groundwater to the surface;
2. Surface water containing sediment;
3. Discharges from swimming pools, hot tubs, detention or evaporation ponds;
4. Water discharged from the cleaning of containers or equipment used in laying, cutting, or
processing concrete and mortar and the water used in such processes;
5. Water discharged from the cleaning of equipment or containers holding paint solvents or similar
contaminants; and
6. Other water posing a safety hazard in the travel way or that could reduce the effectiveness of
stormwater control and treatment facilities.
22.150.430120 Failure to Comply—Nuisance
The following is declared to be unlawful and a public nuisance:
1. The placement, construction, or installation of any structure within, or the connection to, a
public stormwater facility without written permission of the Director; or
Draft January 10, 2008
Page 5 of 6
Uniform Development Code Title 22
2. The discharge of stormwater to a public stormwater facility without permission of the Director;
or
3. The failure to construct or maintain the stormwater facility as required in the permit or site
drainage plan; or
4. The placement or allowing the placement of vehicles, equipment, objects, refuse, garbage, or
litter within the stormwater facility.
22.150.440130 Enforcement
Enforcement of this chapter shall be pursuant to SVMC 17.100.
Draft January 10,2008
Page 6 of 6
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