Agenda 01/24/2008 SPOKANE VALLEY PLANNING COMMISSION AGENDA
COUNCIL CHAMBERS -CITY HALL 11707 E. SPRAGUE AVENUE
JANUARY 24, 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: December 13, 2007
VI. PUBLIC COMMENT
VII. COMMISSION REPORTS
VIII. ADMINISTRATIVE REPORT
IX. COMMISSION BUSINESS
OLD BUSINESS—
NEW BUSINESS—PUBLIC HEARING, REGIONAL STORMWATER MANUAL
PUBLIC HEARING— UNIFORM DEVELOPMENT CODE AMENDMENTS,
TITLE 22, CHAPTER 22.150
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, SENIOR PLANNER, AICP
GAIL KOGLE CARY DRISKELL, DEPUTY CITY ATTORNEY
MARCIA SANDS DEANNA GRIFFITH, ADMIN
ART SHARPE WWW.SPOKANEVALLEY.ORG
CITY OF SPOKANE VALLEY
Request for Planning Commission Action
Meeting Date: January 24, 2008
Item: Check all that apply: ® consent ❑ old business ❑ new business [' public hearing
❑ information ❑ admin. report ❑ pending legislation
AGENDA ITEM TITLE: Adoption of Spokane Regional Stormwater Manual and Changes
to UDC Title 22.150
GOVERNING LEGISLATION: NPDES Phase II Permit and Underground Injection Control
Program
PREVIOUS COUNCIL ACTION TAKEN: City Council was briefed on December 4th, 2007 and
instructed Staff to have the proposal reviewed by Planning Commission. A study session was held with
Planning Commission on January 10,2008.
BACKGROUND:
When the City of Spokane Valley (City) incorporated, the City adopted the Spokane County Stormwater
Guidelines for Stormwater Management (SGSM) by City Ordinance 03-032 as interim guidelines. The
SGSM was first adopted in 1980 by Spokane County, and the last update was done in 1998. Revisions to
the SGSM had been on hold since 2001 because Washington Department of Ecology(Ecology)was in the
process of drafting a Stormwater Manual for Eastern Washington.
In September 2004, Ecology finalized the Stormwater Management Manual for Eastern Washington
(SMMEW). NPDES Phase II permitted communities are required to have a stormwater manual that is
technical equivalent to the SMMEW.
The City of Spokane Valley, the City of Spokane and Spokane County started working together to
develop the Spokane Regional Stormwater Manual (SRSM) in 2004. The intent was to have one manual
for the Spokane region, update the SGSM with the latest techniques and methods, and have a technical
equivalent manual to the SMMEW.
Comments were solicited by the three jurisdictions from Ecology, the design community, citizen groups,
associations, and the public. Public comment period ended September 215, 2005. The draft manual was
available online for viewing at the City of Spokane Valley's and Spokane County's webpage. In addition,
hard copies and CDs were available to the public at each of the three jurisdictions.
Workshops were held on August 24th and September 13, 2005 at the City of Spokane Valley Council
Chambers. In addition, the City of Spokane and Spokane County held four additional workshops at
different locations throughout the City of Spokane and unincorporated areas of Spokane County in
August and September, 2005. These workshops were targeted to answer questions from the general
public. Comments were received from a few citizens, neighborhood groups, local engineers, and
Ecology.
Ecology determined the SRMS to be technical equivalent to the SMMEW in the Fall of 2007. The three
jurisdictions are going through the process to adopt the SRSM.
Changes to Title 22.150 are needed to adopt the proposed SRSM and for minor clarifications.
OPTIONS: Provide Review and recommend approval or non-approval as drafted.
RECOMMENDED ACTION OR MOTION: Recommend the Adoption of the SRSM and changes to
UDC Title 22.150 to City Council.
BUDGET/FINANCIAL IMPACTS: None
STAFF CONTACT: John Hohman and Gloria Mentz
ATTACHMENTS
:, Spokane Regional
�y ` Stormwater Manual
SPOKANE c.OUNIY
"' -+ - - 1.
SPOKANE '"" - —
,::1.,':46.7 4; *
1 , ,1 1 1 1 r�'""e.�ill! .., .,No ) I ; ,7,-,� 7 -mfr � - -
s
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Spokan John Hohman,P.E.Senior Engineer
,Valley Gloria Mantz,P.E.Development Engineer
Is Stormwater Management
idk1..' Really Necessary in the
spoKAttcom-r Valley?
0 ii
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SPOKANE tR�e,4, t
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Spokan e
jUalley
1
A
r , :� : Valley Flooding
SeotcnriE Cowry +i. _ 9
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T 4 ! _tet — - '' .,
4 ate," �i'.I• `
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Spokane
jValley
4
Background
SPOKAK COMFY
a Stormwater runoff flows into
drywells and swales
SPOK=ANE
`• ,� Valley soils are typically very porous
�,� , which allows quick infiltration
Concern for contamination of the
aquifer which supplies our drinking
water
Spokan
Valley
2
A ,,, Typical Drywell
,. 2_" __ ' Installation
S►o owry
SPOKANE
- '
yry M
y
Spokane
4.,Ualley
it
, r,, Typical Swale
SPOKANECowry
^� I !•
.
SPOKANE' r1 — T y.li -.._L- :1
+11,1111
f
Spokane a, : — 1 �` .,
`alley _ �: , .'.........,:-..,;.-1.-.2.-..-_,:,-
3
. Spokane Regional
-g =- Stormwater Manual
SPOKARE Coi'
The SRSM is a technical document used
to design stormwater facilities
SPOKANE
If ::11 * The SRSM establishes standards to
protect water quality, prevent flooding,
and protect natural drainage systems
,, „,,, ,
-, Meets criteria from Ecology's Stormwater
Management Manual for Eastern
Washington for discharges to
groundwater and surface waters
,., /�
S1Valley
•
iig .4,4,', Why Update our Standards?
SPOT Coate
M Better Organization
Existing document is difficult to use
SPOKANE Several amendments
'1 ^all '"; Outdated Methodology in the existing
standards
' """ rf, Include Examples
n Eastern Washington Manual (EWM)
Created by WA Dept. of Ecology
/� 4 Spokane Valley Needs Equivalent
Spokane Manual
Valley
4
Why an Equivalent Manual?
SPOKAtl C NFY
State manual is for entire Eastern
Washington, not specific enough for
S'1="OKI\'NEI our Region
IIA"1:4!
v, State Manual does not have guidance
for Conveyance Systems (pipes,
,t „tett
channels, etc)
State Manual does not have examples
State Manual is difficult to use
1, City is required to adopt State manual
Spokane or an equivalent document
�Ualley
m ' SRSM Background
SroKANE Co trY
Developed by:
• City of Spokane Valley
SPOKANE I • Spokane County
1P:11 • City of Spokane
,t „t,tt
All three jurisdictions will adopt
D119. identical document
One manual for the entire region
Spokane will be beneficial for development
�Ualley community
5
Ys .' .n
SRSM Chronology
SPOKANE CooKrY
til Sept. 2003 - First Discussion of SRSM
ea Jan. — Oct. 2004 - Manual Rewrite by Spokane
S POKaN E
County
.-�• . Oct. 2004—June 2005 - Regional Group Meets
go over Draft Manual
PTto
, fi PublicParticipation Period
July — Sept. 2005 - p
' ' '' " ' 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
,,Valley
''
t SRSM Leading the Way
SPOKANE COUNTY
M In WA, only WSDOT has an equivalent
manual thus far.
SPOK.-INEI - Other jurisdictions are using our manual.
IITA,),,,'` 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
Spokan e starting point for COSM (Central Oregon
,,Valley Stormwater Manual)"
6
04
. Public Participation
y
SPOKANE COUNTY
6 public workshops at various locations
around the Spokane area
POK„INii :1 Posting on the Spokane County & Spokane
. 1 Valley website
Rewswaapnerd notices
Hen rtd Spokesman
'' ' ''" ' _¢ Email distribution to neighborhood
representatives, engineers, developers,
etc.
,41 Media releases
'.; Articles in the Spokesman Review
/\, -.; Review by Washington State Department of
Spokane Community, Trade & Economic
Walley Development (CTED)
At
„, , Applicable Regulations
SPorArE GOUTY
ll Underground Injection Control
SPOKANE (UIC) Rule, Chapter 173-218
ip ^`1 WAC
Eastern Washington National
Pollutant Discharge Elimination
System (NPDES) Phase II
Municipal Stormwater Permit
Spokan~
Valley
7
SPoKANT COWN
r'
SPOKINE UNDERGROUND
INJECTION CONTROL
PROGRAM
(UIC)
Spokane
jMalley
r {F1451..."
U I C
SPOKANE Cowry
sa UIC wells are used to dispose of
fluids underground. Examples
SOKE include drywells, drainfields and
IP 1,E ' trenches with perforated pipe.
; UIC wells have the potential to
contaminate groundwater.
The UIC program protects
groundwater quality by regulating
Spokane the disposal of fluids into the
jMalley subsurface.
8
: 1 �.. UIC Requirements
SPOKAREcOUI\tY
Two main requirements:
SPOKANEi 1 . All owners must register wells
.;4' with Ecology
111
2. All wells must meet the non-
endangerment standard:
➢ UIC well must be constructed,
operated, maintained, and
>Mtlley
decommissioned in a manner
that protect water quality
ititAke
What does UIC mean?
SPOKARE Cam
For existing drywells, owner (< 50
drywells) must:
SPOKANE
rA • 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 retrofitted or abandoned.
�Ualley
9
What does UIC mean?
SPOKAN Courirr
For owners of more 50 drywells.
(City owns 7,000+ drywells):
SPOKANE
--� • 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.
jMalley
V What does UIC mean?
SPOKA Cou'[ry
New drywells:
oKaNE' Must be registered 30 days prior
to installation
Must be designed, constructed
and maintained per the EWM or
an equivalent manual
Spokane
jUalley
10
1$ , , What are we doing to
- - comply with UIC
SPOKANE Co
Worked to develop the SRSM
SPOKANE ` ^
Staff has made an inventory of .
1 2/3 of the City. Expect to
1 ; 9 complete registration by 2009
-; Development Engineering
informs engineer/developer of
registration requirements during
Spokane permitting process
4,Valley
What else is needed for
.: ire UIC?
Sow'c�
Begin well assessment after
registration is completed.
SPOKANE
1p►-�1 4r, Well assessment will identify
_ 1\
drywells that need to be retrofitted or
abandoned.
Need to develop a public outreach
program to inform business owners
of UIC requirements for existing
Spokan' d rywel is
.00 Valley
11
Questions?
SPOKANE COU'IY
S POK=INE
•
1�,i111111 t -
Spokane
1Ualley
Nr ,
SroKAN CoiuY
SPOK=SNE PHASE NPDES
PERMIT
,1 „1 ,11
Spokane
jUalley
12
s'0
i4PDES Phase II Permit
SPoint —COUNTY
Stormwater is the main contributor
to degraded water quality in urban
SPOKANE settings.
/ -`1Development creates impervious
, surfaces that increase the volume
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.
Valley
• NPDES Phase II Permit
SPOKANE CouiJY
-"StormWater runoff may contain
POKIN� or mobilize high levels of
/ contaminants,such as sediment,
-/ suspended solids,nutrients
17-"N
hos horous and nitro en1p p g ),heavy metals and other toxic
pollutants,pathogens,toxins,
• t,,l
°�i' ,, oxygemdemanding substances
(organic material)and floatables"
USEPA 1992,Environmental Impacts of Stormwater Discharges:A National Profile
Spokane
jValley
13
: .: NPDES Phase II Permit
&KurtcODUY
.4 National Pollutant Discharge Elimination
System (NPDES) - Federal Clean Water Act
SPOKANE " Permit authorizes discharges to surface
and ground waters of the State
¢ 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
Spokan than 100,000
.Malley
{' g
Permit Coverage
:MoSPOKAK Cou IY
According to Ecology, the following
municipalities meet the established
SPOIGINEI 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,
0", Chelan County, Douglas County, Franklin
Spokane County, Spokane County, Walla Walla County,
.Malley Yakima County
14
a
Permit Re uirements
SPOKANE Cou'u
Permit requires the development of a Stormwater
Management Program (SWMP)that involves the
following components:
SPOKANE 1. Public education and outreach program
' ., 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
w 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
*lanee
jU ttey
5bg Public Education &
= � Outreach
SPoKAI'CouMY
Develop a Public Education and
Outreach Program that
SPOKANE
F;)71 1. Identifies target audiences
�ly� ' 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,
S iokan contractors, review staff about
jUalley technical standards and BMPs
15
544 Public Involvement and
7464
Participation
SPOKANE Cot'iry p
Develop a Public Involvement
SPOKANE
and Participation program that:
'/ :11!
1. Provides ongoing opportunities
for public participation
2. Makes SWMP available to the
public
Spokan
Walley
Public Involvement &
Participation
SpoKARE cony
SPOKANr ),,N 1 1 4e7E •
r 711•1
:101ISLA
Storm drain stenciling is one way the community can
Spokane participate in the stormwater program
d,Ualley
16
Illicit Discharge, Detection
-i - and Elimination
Sotcnrte Coin
- Develop an Illicit Discharge, Detection, and
Elimination Program by
I. Developing a map oi Lne MS4 (Staff has
SPOKANE completed this task)
IFN 2. Adopting a mechanism that prohibits illicit
discharges and authorize enforcement action
3. Developing an ongoing program to detect and
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
Spokan e
4o•IUalley The City is already doii-g ::i13se items ac least pc,,—,tally
44 Illicit Discharge and
Elimination
Sroi CouVw
.. , r
SPOKANE — —
,p4 .._'.
.4,_
. 5
01\
Spokane Discharge of wash water from a car wash to stormdrain
jValley
17
Construction Site
Stormwater Runoff Control
SPOKANE COU'trY
e 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
�Ualley The City is already doing these items at least partially
Construction Site
Ajp Stormwater Runoff Control
SPUME Cowry
•
SPOKANE -
141
7.
ci
Poorly maintained BMPs can result in significant
Spokane quantities of sediment discharged to storm drains
jUalley
18
,i,,ikit
Post-Construction
Stormwater Management
SPOKANT Com
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
the regulatory threshold
SPOKANE 2. Adopt a mechanism that requires treatment,flow control,
IF :;g1
and source control BMPs
3. Adopt requirements to ensure long term maintenance of
the BMPs
4. Document how the required BMPs protect water quality to
t>> > the maximum extent possible unless a manual equivalent
to EWM is adopted
5. Adopt procedures for site plan review for required BMPs
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
doe/Valley
The City is already doing these items at least partially
Ais Post-Construction
1111'_z • Stormwater Management
NE
SPOKACourcy
», t' mss.
•
.
i � rr�,
SPOKANE f;_ 4i r , 4114 .4 t , ,.. it
11;:g1 ,
';,,'I
Spokan'e Lack of flood control can lead to flooding and erosion
jValley
19
Post-Construction
spoStormwater Management
...... , -.14, 42
______....„--:
SPOKANE
....'II
_
*lane LL Swales help reduce stormwater runoff and provide water
,, •IUalley quality treatment
Pollution Prevention and
f� Good Housekeeping for
S > c ,r Municipal Operations
I 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:
t' Develop inspection and maintenance procedures and
schedules for stormwater BMPs
�11�1.4,1N1 r, Implement BMPs to treat pollutants from streets,
'',�' maintenance areas,and waste transfer stations
r Establish procedures for properly disposing waste
removed from MS4
n 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
Spokane maintenance
4,Ualley
20
Pollution Prevention and Good
1{ a-X ' Housekeeping for Municipal
- d V`V.
SroxnrT Coast Operations
SPOKANE as_'Th� -w -- _
11
,, -,;),, ,)\
,,, 1 ,
____.. _ ,
_,. whT
, • , :
_ _ c. i
,._
_ . .. ,
40 4 i 11 4::-
19 yi
4 ((iiiril
''
Spokan e Pollutants in the stormwater system can be minimized by a street
,Valley sweeping and vactoring program
` S QUESTIONS?
SPOKANE Cot try
SPOKANE ; c .•. 2
•
k
koti,4,, • .401„
___
...... .,........ 7•.----,---.. _ , ..7.7,1-,-- -f-.74:-..a-'17:4".••
S°„`kane
Ualley -,-- -
21
544
SPOMK COUNU
jo- SPOKANE REGIONAL
STORMWATER
MANUAL (SRSM)
Spokane
�Ualley
u ; SRSM Contents
SPOKARE Cou'u
Chapter 1 Introduction
Chapter 2 Presents 8 Basic Requirements (BR) &
SPOK��E Establishes Regulatory Thresholds
p1,111"1Chapter 3 Requirements for Drainage Submittal
(BR#1)
Chapter 4 Geotechnical requirements (BR#2)
Chapter 5 Hydrologic analysis
Chapter 6 Water quality treatment(BR#3)
pkane
Si' 'jUalley
22
' SRSM Contents
SvoKAIE Caw(
(
Chapter 7 Flow Control (BR#4)
SPOKANE Chapter 8 Conveyance Systems (BR#5)
, , , I Chapter 9
Erosion and Sediment Control (BR#6)
Chapter 10 Controlling Sources of Pollutants (BR#7)
Chapter 11 Maintenance Requirements (BR#8)
s okan Appendices Design Examples
j%alley
Changes with SRSM
SPOKAN Cowry
Chapter 2 New Threshold Now Also Applies to:
:Projects Proposing UIC facilities
rtAll projects disturbing one acre or more
SPOKANE :All projects adding 5,000 square feet of
I P _ '
' , ' '' impervious area. This threshold applies to the
total amount of new impervious surfaces added at
full build-out.
� :Removed references to pre-approved soils.
Chapter 4 Drywell disposal requires at least minimal level of
geotechnical work.
:Spokane 200 Method for drywell disposal.
Already in use.
Chapter 5 rtRainfall intensities are calculated differently.
p Stormwater facilities are about 15-20 percent
Spon' a smaller
4,Valley
23
L.4: Changes with SRSM
SPolcnr�Co«tnr
Chapto r 6 ,Continues the use of the new treatment method
developed in 2005.This method has been approved by
EPA.
rtAll projects proposing drywells are required to provide
SPOKANE
treatment(UIC compliance).
, r All projects proposing drywells must register with
Ecology(UIC Compliance).
1Discharges to surface waters may require treatment for
metals and phosphorus.
1 ,+1 i 1 nProjects 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)
*km
�Ualley
Changes with SRSM
SPoKANT Cowry
Chapter 8 'Updated sizing methods to be consistent with
WSDOT
Chapter 9 rProvides specific guidance for elements required
P by the permit.
SPOKANE
!sr
Chapter 10 This entire Chapter is new and is required by the
permit. It requires that BMPs be implemented to
ll�l prevent pollutants from entering stormwater to
1 ,� protect water quality of surface water and
1 ' '1 '1 1 grounwater.BMPs are for street maintenance such
as street sweeping and catchbasin cleaning.
Spokane
jValley
24
Commercial Project
;+JO-. • Example
SpoKANE Couvr
Existing Conditions include a _ - ---_ CT TT @� "!F
building,paved parking area and —` `--- - - -"_-"--- - - - -
gravel parking areas
Permit application to pave a / - �*
SPOKANE portion of the gravel areas(<5,000 II F EE, , T 1 } •1
I I—qk 1 sq.ft). The entire parcel is now +' `- #:•0
impervious and over 5,000 square F I . �.% i '+
1(/
feet. p a'�/ F N,
1�',1',\,; Treatment or flow control are not • ? - er•
required now. Private runoff goes ,r �' ,�
to our ROW and drywell. amk r p_ ,_.\ - r;
Private flow to public drywell i( ,;,i h Ft�!Ff� -IFP 1
increases liability to the City 444 phi-:
— With SRSM,applicant shall provide treatment and flow
control for new improved areas(if total developed area
01\ (existing+proposed)is>5,000 sq.ft.
Wane Flow control would require a swale and drywell onsite to
4,Ualley treat additional runoff. UIC registration requirements
apply also.
Commercial Project
-__ Example
SPOKAAN cowry
NEW REQUIREMENTS
Owner shall register new drywells
SPOKINE ' Relationship between owner&Ecology is created
1111 .."\11:711,4:
Project is required to provide treatment if a drywell is
proposed regardless of size of project
i Project is required to provide flood control and
J 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
Sp ikane
jUalley
25
11 Adoption Schedule
SPOKANTCoURFY
Obtain SEPA determination with Spokane
County and City of Spokane with Spokane
SPOK�NE� County as the lead agency
Januaryg 10, 2008 discussion with the
1 , PlanninCommission
,,, ,;`,,', January 24, 2008 public hearing with the
Planning Commission
Hold a public hearing with City Council in
February 2008
Schedule a meeting with City Council by
March 2008 with Staff recommending to
Spokane y motion the adoption of the SRSM
�Ualley
4x
Title 22.150
Spocw Cowry
SPOKANE' WA Minor changes to Title 22.150
are necessary.
Spokane
4,Ualley
26
,� Recommendations
SPOKANE COUI Y
rri Make minor changes to Title
• 22.150
SPOKANE
1FMAdoption of the Spokane
Regional Stormwater Manual
Spokane
�Ualley
: ,;` QUESTIONS?
SPOKANE COMIY
SPOKANE
. T
1 l 1 1 t 1 1 = ,• �a.1,
ets ?�1► ,
•
hs i- n
�`rL`,. �.�c�'^' - `x�t. '+•wed -1
Spokane r E``"i`,.
�Ualley
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.
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Uniform Development Code Title 22
22.150.040050 Review Process
Following submittal of a request to engage in a regulated activity, the DirectorDevelopment Services
Senior Engineer shall review the proposed regulated activity including any plans or other submitted
material. The DirectorDevelopment 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 DirectorDevelopment Services Senior Engineer may require the submission of additional
material and/or analysis to allow the proponent to demonstrate compliance with City Standards.
22.150.050060 Conditions of Approval
The DirectorDevelopment 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.
-•e __ -ement 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
vo . - '-- -- - - --- - '
Spokane County, Washington-
contains an easement fo _ _ - -_ _ _ - • _ _ - e ••...- - _. _ _•• __ _ --•-- -
within the plat and from roadway and sidewalks adjacent to the plat.
irrigation system.
4. The Parties desire to provide for the p- _ ._ • _ • - _ _ __ _ _ _ __ ••-• _ •
drainage swa/e and its irrigation system.
• _ _ _ _ _ ___ •- N_-"es agree as follows:
1. Buyer agre s to m„-in
and watering the grass in the swale to kcee •- - --- - •• ..e •- - .- - e
appearance.
. s. . _ _ _ -_ - •- _ - __ - - - . __ _ _ - -e • -r system which is connected
•- -e--- -e. -_ - _• •- e f-elessr-ibedabove, and that Buyer will be providing and
paying for water to irrigate the drainage swa/e. In addition, Buyer agrees to keep the drainage
swale irrigation system in good repair and functional for its intended purpose.
drainage swale.
4. The City of Spe _•- . - - - - - - -e-' - _ , , --d pip s that receive
runoff from public rie• _ _ _ __ - •• - _ -_- _• _ _ -- _-.
5. Buyer understands and a= - _ - - - -- - - - - - - - • - - • - --
charge Buyer for its labor and maintenance.
-ya112
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Uniform Development Code Title 22
The City may also enter into a development agreement with the person having ownership or control of
the real prop- . - • -- -- e -• - - - - . --- e-.- -- •-• -greement shall be entered into
22.150.060 Design Elements
follows:
1. Continuous swales running the length of the street located between the curb and-sidewalk
- _ - - - _ - _ _ •. _ or road and le-- -_ •.• - • ----- ; _
3. Consolidated ponds o • _ - - - ecated on a separate tract or lot owned by a
ha--e • - -- - e e - e -- e - - - - e e --• -ous around the
p- •-- - _ -- _ -- -- _ e- -- -- - _ - - - - -cceptablc on pr� �'�-oommercial
developments.
22.150.070 Design Method
_ -_ __ _ - _ • - e—_ _ •- e- • _• cc other standard soils shall use the equation-Pelow-to
determine the size of the facility:
V- 11 33 A where
V- Volume of swale (cubic feet)
A - Pollution generation imp .ious surface (acres)
Allswale d- e • • -- - - - •- - - - - - - --- - -- ---- - - - -
Engineers designing drainage facilities located in non-standard soils must submit a design deviation in
e-'-- • • • - . _ . _!.U! _ _ _ . ___ e.- _ - •- e -ctor prior to utilizing the above
method in their design. G-e -_-••__ •- • •_ • ce required:
22.150.00070 Deviations and Appeals
1. Authority. The DirectorDevelopment 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
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Uniform Development Code Title 22
fifteen (15) days from notice of the DirectorDevelopment Services Senior Engineer's action, the
applicant or an aggrieved party files a Notice of Appeal with the Hearing Examiner.
22.150.890080 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.
22.150.400090 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.
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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.
22.150.4-20110 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
DirectorDevelopment 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
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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.
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