HomeMy WebLinkAbout2014-04-01_WORK SESSION04 Ce: h `
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Water, Sanitary an- d Stormwater
Utility Planning and Capacity
City Council Work Session
April 1, 2014
f' ',; www.EdinaMN.gov
11-1A.
CITY OF EDINA
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Presentation Overview
• Growth & Demand Projections
• Service Reliability, and Peak Demand
•
Water-Needs
• Sanitary Needs
. Performance Management
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Which Came First?
Chicken Egg
www.L-diiialVilV.gov
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Growth Projections "w`J
Met Council 2030 Projections
Historical population.
Scenario 'T" " (Sl)
Census
Po
......... ��
1890
531
—
• 50,000 Population / 57,400 Jobs
1900
749
41.1%
Scenario "2" (S2)
1990
1.1X11
47.0%
1920
1,833
66.5%
• 70,149 Population / 70,000 Jobs
1930
3,130
71.2%
1940
5.855
56.6%
1950
9,744
66.4%
New Met Council 2040 Projection's
1960
30,432
212.8%
1970
44.031
44.40
Scenario "New" (SN)
19.80
46,073
4.6%
53,300 Population / 59,000 Jobs /
1990
46,075
0.0%
2010
47,425
2.9%
2090
47,941
1.1%
(*draft)
U.S. Deowinial Census Lf
www.EdinaMN.gov
Water Demand: Projections
11-1 A,
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Tabled Ult! -mate: Water Demand, Projections
Year
Met Co'Uncil
.Popul.ation
AD 'Demand
(MGD)
KU Demand
(MGD)
MD Peaking
Factor
2005
47.425
7.35
12.87
3.00
20.f0
48,500
7.6
22.7
3.0
2020
49,100
7.7
23.0
3.0
2030
50,000
7.8
23.4
3.0
Ultimate'.
70.149
10.9
30.1
2.75
,Trend
• Growth
• Lawns
Countertrend
• National plumbing code
2010: 7.6 AD, 22.7 MD
2030 (S1): 7.8 AD, 23.4 MD
2030 (S2):1-0.9 AD, 301 MD
2040 (SN):
Average Daily (AD), Maximum
Daily (MD)
www.EdinaMN.gov
Sanitary Demand Projections
Trend
• Growth
Countertrend
• Inflow.. and -infiltration reductions
• Residential inflow inspections
• Water conservation] code
FLOW Million Gallons /Year (MGY)
2010: 2,500 Plan, 2100 Actual
2030 (S1): 2,600
2030 (S2): 3,267
2040 (SN): ?
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Table S -1
HISTORIC SANITARY'=SEWER FLANS
:Year
Population
Flow
(VIGY)
1579 -80
46,073
2,664
1996
46.984 `
2,727
1994
46.841
2,508
1995
46.845
2,559
1996
47,029
2,208
1997
47.128
2,336
1998
47.227
2,150
1999
47.326
2,187
2000
47.425
2,046.
2001
47.583
2,162
2002
47.740
2,238
2003
47.858
2,157
2004
48:055
2,129
2005
48,213
2,138
2006
48,370
2,133
www.EdinaMN.gov
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Service Reliability and Peak Demand "`
Figure 1 —Trends in Per Capita Demand and Demand Peaking
Water: Drought
week in July
• Sanitary: I/I Event,
wet summer
• Storm: 0.1%
annual probability
storm event
_AD Per Capita Water Use (gpd)
450.0 --no-MD Per Capita Water Use tapdti
M 400.0
350.0
300.0
250.0
CL
200.0
a 150.0
100.0 i — -- - — -- :-
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
Year
i
i - 0
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www.EdinaMN.gov
(SN) Water Needs
• Supply:
Additional
filtration capacity
in SE Edina
• Supply: 1-2
additional wells
and/or
conservation
• Distribution:
Continual repair
and replacement
of cast iron pipe,
valves, hydrants.
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Legend
■ Well
a Water Storage Tank
% of Water from Well 5
• 0-10
it Water Tower
• L
too" Well is
11-20
21-30
31-40
41-50
>50
I GEOGRAPHIC EXTENT OF WATER FROM WELL 5
-9:C'3 Figur(
WATER SYSTEM DEPI AND CAPACITY ANALYSIS
�tbter TfeatrAe,t Rant No. 5 Ij
SEH Edina. Minnesota
www.EdinaMN.gov
Existing Sanitary
Needs
• Inflow and infiltration
reduction program
• 72nd Street / Industrial
area capacity?
• th r
65 /Xerxes Trunk
capacity?
• Continual repair of
lateral lines, trunk
s
lines and manholes
FLU.NS TO
FLOWS TO 1 -SLP -477
1 -NIN -330
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1- tViN -3•r
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14dN -313
JI� :4�` -
—!—r1- —
�c
taN -.:fa
1 -MN -34.5
— ✓� 1 ; t, I AREA CAN FLOW
L rj', j T0 1_2r 4R
I- RF-491
1 -RF -491
''
LEG_,END
—� MCES INTERCEPTOR
—1
LOCAL SB'VER OUTLET
LOCAL SEV^JER PIPE
MCES FLOWP1fETER
1- RF-491 MCES INTERCEPTOR LABEL
1
3- BN- 49- -l-
Figure 5 -2
MAJOR SEWER SHEDS AND OUTLET:
2008 Comprehensive Plan
city of Edina
Edina, MN
G-4829
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G, 1,986 4.457
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G-51 59 N G -5151
y ^ 58 3,848 3,590 3,212
G -5190 0 N G -5160
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3,201
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MC
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G-4982 6_4978 G-4977
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c G-4972
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(SN) Sanitary Needs
• Trunk capacity
additions in
southeast Edina
• Northwest Edina
rehabilitation
Minnehaha Trunk
lining
.1,✓.a G 6032 a5GS1 G solo
4 XW 5,M3 1.E64
0.51'2
463
100 SAI
IS-128
Soaps =sn. rnLO 4AJTEQ. USG C nt—p PC. NRCAN, Esn ,span MET . Esr
Fc -p: Esn 7h3dana 'amT— 2013
'--'J'ITY OF EDINA
Performance Management
• Accelerate
adoption of i 'A, 's I
GIS/Asset
management tools
• Service based
performance
metrics
• Integrated project
scope decisions LJJ - - - - - - -
(road /utilities
Ir
/other) 7NIM - -
www.EdinaMN.gov
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Arden Park D Neighborhood
Watershed District Partnership
City Council Work Session
April 1, 2014
www.EdinaMN.gov
Arden Park D - 2015 Street Reconstruction
to City's annual bituminous
street reconstruction
• 2008 Comprehensive Plan
indicates new sidewalks on
most streets
• Opportunity for Living
Street Elements
• Stakeholder Engagement
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�NNN
4908 d9•. -
7 4400 � 4917_ 4929 4929. i
PROJECT LIMITS p1a 4 ° 4100 3a2aaaae �-
B 4919 4936 '� 1 — ' 22
W SOTH ST
• c.000 500, 5D00 500•. „� • n. ,390919 �i'
` 4401 W ' -; $ i :121 391 3 -15! d
_� • 5002 5003 5002 > 5003 21 11 - i Sj
�{r'7''� y ••t5D0a 5DD5 5004 Z 5005 Sa t6 5a t ; �iS
W
O13J 5015 �iL 5006 5007 SOC6 5007 > 5020 5021 4050
0 5009 5008 < 5009 :4 5024 -_ 3945
mil•
5008 6 5011 5010 5011 50 32 5025 5034
��(� •i 5010 ' 5013 5012 5D13 5028 5029 5028�y 51-- - 5036
ee M W
5023 `"'•.a 5012 , 5015 5014 5015 504p
5027 ', , ISQ21 5019 Sp 5033 5032 '•i
00000" 16 5017 SOt6 5019 5044 5101 51C0 4075 S4 �a 5050
z•... 5037 5036
z,9 so2oe 5145 S,G:
1 510, $101 5100 5101
5026 BRUCE AVE 5023 5922 5103 5100 StOa S,CB 5101 5100 5105 5104 5105
I;p_ 5104 5113 5112 5105 5104 5109 5108 5109 �,.
ti 5,05 .
13 7� LV�3 5078 5029 5107 5106 ; 5117 St t6 > 5109 5708 w 5115 5112 5113
017 5030 CPC 5109 5112 < 5121 5120 < 5113 5114 G 5117 5116 > 5117 St t2
. t 9 ~- 5038 5110 5111 5116 H 5125 5124 O 5117 5116 a 5121 5123 51Zt 5118
5113 z Z u < °.'2 >:
` 5117. < 5125 5124 CD' •
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Y
r121 p 51:7 5133 5132 5133~ St30
•., 5116 5128 5137 5t 36 5,29 5128 5137 5136 5137
W 52ND ST ;
`` '� •. 5201 4207 5200 5201 5200 i
5�p 5201 \ �•.� 52p5 4201 5704 5205 3915
5209 1 • �. 5209 5208 5209 o
1
5212 5211 81, 5212 $213 �
5216 5217 5220 ` 5 ,� 5217 5216 5211 i
5220 5221 5224 5230\ ', I! 5221 5220 5221 i•....••.• -•+
5224 5225 5228 ry tip , i; > 5225 5224 5225 r�
5228 5232 44 � m 5229 5228 5229 ;
5232 5233 5238- 52 • d 5233 5232 5233
5236 5237 5240 5241• 5236 •:� C 5238
'• W `- '241 5240 5241 ;
5300 5301 5300 5301 53W . Z 53 DD 5301
5304 -5305 5304 5305 5304 S 5301 5304 5305 5300
5"6 5307 5308 5311 5306 53DD 5308 5309 i
5312 5313 5318 5318_ 5312 /J •j 5313 5312 5313
5316 5325 5324 5325 5316 I ••�• 5316 5317
5320 5331 5328 5331 5320 �• 5321 5320 5321
5324 5337 5332 5337 5324 l { 5324 5325 �i 5330
5328 5341 5378 5343 5328 5329
5332 5349 1 5348 5351 5328 1 ��•.�� 5373 5332 5333 535`
5338 S35t 5348 5357 5338 - 53:16 5337 i 3908 15353
W 54TH ST
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Edina's Living Streets Vision
• Transportation utilizing all modes is
equally safe and accessible.
• Families regularly choose walking or
bicycling instead of driving.
• Streets enhance neighborhood
character and community identity.
• Designing facilities with all ages and
abilities in mind
• Bicycle Accessibility
• Education and Encouragement
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www.EdinaMN.gov
Edinds Living Streets Vision
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Public policy strives to promote
sustainability through balanced
infrastructure investments.
• Environmental stewardship and
reduced energy consumption
are pursued in public and
private sectors alike.
• Streets support vibrant
commerce and add to the value
of adjacent land uses.
www.EdinaMN.gov
Living Streets in Arden Park D Project Area
• Narrowing of some streets
• Parking changes
• Sidewalks with boulevards
• Halifax Ave and Arden
Ave /Minnehaha Blvd =
"Local Connectors"
• All other streets "Local
Streets"
PROJECT LIMITS
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Living Streets in Arden Park D Project Area
. I PROJECT LIMITS. I � �TM
• Narrowing of some streets L
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7
_�
• Parking changes ` Q
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\ w
• Sidewalks with boulevards ....., ��
BRUCE AVE l
ar
• Halifax Ave and Arden
Ave /Minnehaha Blvd =
"Local Connectors" `
• All other streets "Local
Streets"
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W 54TH ST
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Maplewood Living Street Project
Bartelmy -Meyer Neighborhood:
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Narrowed streets
Sidewalks on all streets on one
side
34 new rain gardens
,� e �.
www.EdinaMN.gov
Demonstration Project: Raingardens
Maplewood example:
received nearly $1M grant
funding in partnership with
watershed district
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www.EdinaMN.gov
Partnership Proposal
• Stormwater management and
flood control BMPs
• Public Improvements
• Porous Pavements
• Under street floodwater
storage and infiltration
• Park natural resource and
regional BMP
• Preapproved MCWD Cost
Share for residents
• Rain gardens
• Street trees
• Shoreline stabilization
Legend
SAFL Saffe
Storm Sewer S.ruc:ure
Storm Sewer
Streambank S:ab,llza:jon
'n ngarden
a ng3rden+Streambank .` :3biliza:IOn
�rojec Lirrits
AIC'.ti'D Subwatersnecs
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Partnership Proposal
• Minnehaha Creek Watershed
District project partner
• Sub - watershed analysis study
• Funding commitment
• Grant /funding opportunities:
• Clean Water Revolving Fund
• Minnesota Clean Water Fund
• Preapproved cost share decision
• Education and outreach is key!
• IAP2 and Master Water Stewards
1AP2 Spectrum
of Public Participation
iapz
Inform
Consult
Involve
Collaborate
Empower
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aspirenonsam
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consrctert'c
of the orc reird
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ardrrstoodand
solut:cn
oppmun :Ics
considered
ana t be ut:vns.
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lifonned. h.ceu :,
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1.111r.crtcit
.ind ack at e lcLp:
u l , _.. I r:
:.: lww%xloc:
eau you decide.
l';1n:C ri to a:1C
..I'.I -. .I ,i'1!D
ll ft-911Mlat. llg,
prmice eedhatic
L ,_
neo-wraleyv r
oV h:ne public
a lvit'e and
npui mFlnenred
developetiard
r;omrias1c.10tim
.he crc -sn>n
provide ;vcdha:k
nro the censor:
on host puh1;
o thL maximum
mpat'rfltcnccd
eaten: poss'b:c
:he d_clslvn.
• Fix: shre:s
■ 11rh silte
■ ['lacn hat;scs
• PubkL comment • Wco kshcps
■ I•o: us gruup. • Urlfbt•: alive
• surveys pooping
■ puhl'.. • lvt'l,Ng
■ Ctt,cn advisory
• C:trxn I>~-cs
c011u°11NICS
■ Ballot.;
■ Cr- wrs.s-
■ DclLgated
hutzicng
uekston
■ Plil[:ICLl Ial4lry
:1i:l:.tillltt
makiag
www.EdinaMN.gov
Issues /Concerns
Transportation
Minimum or maximum street width?
Minimum sidewalk installation?
Limit parking to one side of road? -
Flat curb or rural section on Minnehaha Blvd
Stormwater
• Increased service level / associated cost?
• District partnership?
• Increase project scope to include work in Arden Park?
Process
• Public and stakeholder engagement level of effort?
• Interim, Council- Decisions on minimum plan elements?
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www.EdinaMN.gov
Questions /Comments
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www.EdinaMN.gov
To: MAYOR AND COUNCIL
From: Mark K. Nolan, AICP, Transportation Planner
Date: April 1, 2014
ane
Work Session Item #: III
Subject: Arden Park/Minnehaha Watershed District Partnership
Action Requested:
Action ❑
Discussion
Information ❑
Discussion and general direction regarding a proposed partnership with the Minnehaha Creek
Watershed District (MCWD) and Living Streets "Demonstration Project" for the Arden Park D 2015
neighborhood reconstruction project.
Information / Background:
The Living Streets Implementation Plan is currently being drafted and is anticipated to be ready for Council
approval by fall 2014. However, the Arden Park D neighborhood reconstruction project scheduled for next
year may be a unique opportunity to more immediately apply the vision and principals of the Living Streets
Policy (adopted by Council in August 2013). Opportunities include traffic calming techniques, improved
pedestrian network, streetscape enhancements, and stormwater best management practices (BMPs).
In February staff prepared a draft proposal (attached) that envisions a partnership between the City and the
MCWD to provide a local Living Streets model as applied to a neighborhood reconstruction project. Staff.
from both agencies met twice Qanuary and March 2014) to discuss potential partnership opportunities. The
mutual goal of this effort for the City and MCWD is to benefit the neighborhood and region by
implementing stormwater BMPs, which may include (but are not limited to) rain gardens, street trees and
porous pavement.
Staff wishes to discuss several key related issues with Councilmembers at this work session. These include:
• The potential to narrow streets from their current width
• Edge of roadway treatment on Minnehaha Blvd.
• Potential to restrict parking to one side of the street
• Maintenance of rain gardens
• Installation of sidewalks with boulevards
• Increased service level /associated cost
• Public and stakeholder engagement
Attachments:
Draft Proposal for Partnership with MCWD (with Appendices)
G: \PW \CENTRAL SVCS \ENG DIV\PROJECTS \IMPR NOS \BA391 Living Streets \Arden Proposat \WK SS Item III. Arden Park Watershed District Partnership.docx
City of Edina • 4801 W. 50th St. • Edina, MN 55424
PROPOSAL FOR PARTNERSHIP
Arden Park and "Arden Park D" Neighborhood Street
Reconstruction
Living Streets Demonstration Project, joint Grant Application
2/21/2014 DRAFT
Proposal Overview
This draft proposal envisions a partnership between the City of Edina (City) and the Minnehaha
Creek Watershed District (District) to provide a local model of the "Living Streets" reconstruction
practice.
This proposal includes background information on Edina Living Streets, and calls out potential
opportunities the 2015 "Arden Park D" neighborhood street reconstruction and nearby parks and
natural resources. Also contained is a proposed form of partnership that suggests how the City and
District can best work together.
Edina Living Streets
On August 20, 2013, the Edina City Council approved the Living Streets Policy. This policy included
the development of the Living Streets Plan to, in part, identify specific standards for stormwater
management, incorporate outside regulatory requirements, and define the process for resident
participation in street design. The development of the Living Streets Plan is currently underway,
although the specific standards are still evolving.
"Living streets balance the needs of motorists, bicyclists, pedestrians and transit riders in ways that
promote safety and convenience, enhance community identity, create economic vitality, improve
environmental sustainability, and provide meaningful opportunities for active living and better health. The
Living Streets Policy defines Edina's vision for Living Streets and the principles and plans that will guide
implementation."
Environmental sustainability, flood protection and clean water are key components of the policy
and the early influence of the District is a welcome addition to putting these policies into practice.
The Low Impact Development (LID) goals and techniques of Living Streets are closely related to
the District's goals for abstraction /filtration, water quality, public health, water quantity, best
management practices, education and communications, and recreation. Through this partnership,
the District's clean water expertise, education and outreach ability, and Master Water Steward
initiative will help guide and inform Living Streets.
Background
The Arden Park Area is unique in character and contains the regional resource of Minnehaha
Creek. The project area is a center for community, recreation, and business activities: bordered on
the north by two churches, on the northeast by the 50th and France business district, on the east by
two churches, private schools and mixed business and multifamily uses, on the south by 54' Street
and along the west by Minnehaha Creek and Arden Park.
Page 1 of 5
In 2015 the City of Edina will reconstruct a portion of the Arden Park neighborhood. This project
will be an early application the Living Streets policy and implementation plan. The integration and
demonstration of clean water infrastructure should be a top priority in this creek -side
neighborhood. The Arden Park reconstruction project is an opportunity to provide significant
stormwater treatment for an area which.currently drains directly to Minnehaha Creek, and also to
demonstrate Living Streets in an area that is highly visible due to the proximity of parks, trails,
Minnehaha Creek, and moderate - volume streets.
(See appendix for neighborhood map, Arden .Park D project area, reconstruction schedule map,
and Figures I and 2 in 54th Street and Arden Park Area Stormwater Management Plan)
In 2013, the City engaged the District in the planning and stakeholder engagement process
centered around the 2014 54' Street and 54' Street Bridge reconstruction project. The project
team then held a substantive and transparent stakeholder engagement process that shaped and
informed the project design and the 54th Street and Arden Park Area Stormwater Management
Plan.
Standard Reconstruction Process
The standard reconstruction process proposes the: rehabilitation of existing utilities and road
network to meet the current service expectation. The repair of existing storm infrastructure is
generally included, as is the development of an extensive network.of sump drain line to solve
nuisance drainage problems. The projects adhere to District rules for linear transportation
projects, meet a no- net - increase standard and typically, the City voluntarily adds underground
sediment capture structures.
Stormwater from the 2015 Arden Park D project area and the greater 50 h and France business
district currently flow directly untreated to the creek. In a standard reconstruction process, this
pattern would continue with the potential for some additional sediment capture.
Opportunity
Living Streets
Living Streets reconstruction proposes the holistic review of existing service levels and the
consideration or addition of pedestrian, bike, clean water and flood protection services. One of the
primary components of Edina's Living Streets vision is the active pursuit of environmental,
stewardship, including setting goals for the reduction of storm water volume and unfiltered street
water flows into our local waterways. Living Street applies LID techniques such as impervious
surface reduction, bio- retention, filtration, sediment capture, and infiltration and reuse of
stormwater. These stormwater treatments should be applied, in a cost effective and strategic way
to best integrate with various transportation modes and the neighborhood, aesthetic.
Opportunities for sustainable infrastructure and LID are called out in the Stormwater Plan. This
plan could be expanded to include cost/benefit for individual watershed source controls described
as "Level 2" implementation, priorities. The plan also describes the results of the stakeholder
engagement process. A detailed review of the stakeholder engagement summary found unanimous
support for natural area management, buckthorn removal, and conditional support for rain gardens,
tree trenches, and regional native plant filtration basins. Support for these practices was
conditioned on maintenance of active use green space, higl' quality aesthetic and safety concerns
being met.
Page 2 of 5
Parks, Recreation and Natural Resources
Arden Park sits along the banks of the Minnehaha Creek and features active recreation in the form
of playground, hockey rink, and a recreational skating rink. Connecting trails that run through the
park and cross Minnehaha Creek provide passive recreation. There is a planned rehabilitation of
the Arden Park shelter in 2017. Minnehaha Creek is a high quality resource in this area and is used
for canoeing and kayaking and passive enjoyment. The 54' street crossing also includes a canoe
portage and an area used for whitewater kayaking.
Opportunities for non - structural and regional treatments called out in the Stormwater Plan include
native area restoration, buffer establishment, bio- retention, and infiltration features. The removal of
buckthorn and establishment of flowered prairie and buffers were rated highly by 54 h street
stakeholders and synchronize well with watershed and City goals for mixes of active and passive
recreation space.
Clean Water Service
The Edina stormwater utility uses performance measurements to judge opportunity for clean water
and flood protection improvement. Flood protection performance measures include peak rate and
volume runoff discharge measured in cubic feet per second and acre -feet, respectively. Clean water
performance measures include removal of sediment measured in tons and phosphorus measured in
pounds. A variety of potential clean water treatments were analyzed as part of the stormwater
report 54' Street Area Stormwater Management Plan, many of which appear cost effective. These
potential improvements ranged from structural to nonstructural and publically owned to privately
owned. Cost benefit criteria should be used across all clean water BMPs and project types to best
target public investment.
Form of Partnership
A partnership between the City of Edina and Minnehaha Creek Watershed District could take a
variety of forms. This form of partnership envisions three main deliverables:
1. Public neighborhood street reconstruction project and Living Streets demonstration.
2. Public parks, natural resource restoration and regional BMP retrofit project.
3. Living Streets implementation plan, template and toolkit.
A variety of workload or financial resources would be required of each partner. Here are
examples for consideration:
Minnehaha Creek Watershed District
• District grant funding for public -owned BMPs
• Preapprove cost -share formula for homeowner BMPs
• Statewide grant application and grant contract administration
• Technical assistance
• Public involvement and education assistance
• Homeowner BMP point of contact
City of Edina
• Public involvement and stakeholder process
• Design and engineering
Page 3 of 5
• Public bid (neighborhood public system, homeowner BMP coordination)
• Public bid (park and natural resource)
• Construction contract administration
• Creation of working Living Streets template /toolkit
• Natural resource restoration project, 5 -year maintenance
The extent of participation and integration of work are highly variable based on the project goals
and level of consultant support for design and construction administration. Here are example
minimum levels of participation:
1. Funding for detailed stormwater management plan, and sub watershed analysis.
2. Staff time for joint grant applications.
3. Staff time for education, outreach and ongoing support.
Examples of additional watershed participation may include:
. Assistance during sub watershed assessment, neighborhood engagement, and /or
stakeholder involvement.
2. Master Water Steward coordination, public education and outreach
3. Assistance and participation during design
4. Coordination' with residents installing BMPs during construction
S. Participation in Living Streets implementation plan development, template and toolkit
Example Schedule
I. Consider Proposal for Partnership
2. PFA Project Priority List Scoring Due
3. Professional Services Scope
4. Award Professional Services Contract
S. Sub- watershed Assessment
6. PFA Intended Use Plan Due
7. Pre - Approved Cost Share Decision
8. Stakeholder Engagement and Prelim Design
9. Public Improvement Hearing
10. Clean Water Competitive Grant Due
11. Open Bids, Award Project
1.2. Start Construction
13. Complete Construction
February — April 2014
March 7, 2014
April, 2014
May, 2014
May - June, 2014
June 6, 2014
June — Sept. 2014
Sept — Oct. 2014
November 2014
Feb - March 2015
May 2015
October 2015
Conclusion
Living Streets raises the bar for clean water, flood protection, bike and pedestrian services in street
reconstruction. This revaluation of services requires the attention and hard work of creative
professionals to design safe, seamless, and attractive new infrastructure that is cost effective,
increasingly sustainable and broadly supported by the local neighborhood.
The Arden Park D reconstruction project provides a unique opportunity to implement clean water
practices near the banks of Minnehaha Creek and to rewrite a standard City process creating an
example for future Living Streets reconstruction projects to follow. While the Living Streets Policy
is a reality in Edina, the trajectory of this change depends on close collaboration between City and
District, and the resulting acceptance of the local neighborhoods. We welcome your help.
Page 4 of 5
Please contact any of the following staff with comments and questions
Mark Nolan — Transportation Planner
City of Edina - Engineering Department
7450 Metro Boulevard
Edina, MN 55439
mnolan @edinamn.gov
Phone: 952- 826 -0322
Chad A. Millner, PE - Director of Engineering
City of Edina - Engineering Department
7450 Metro Boulevard
Edina, MN 55439
cmillner @edinamn.gov
Phone: 952- 826 -0318
Appendix
Arden Park D Neighborhood Map
Street Reconstruction Schedule
Edina Living Streets Policy
Stormwater Management Plan — 54th Street and Arden. Park Area (January 30, 2014)
Maplewood Living Street Demonstration Project H erlink
Page 5 of 5
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Note /Disclaimer
The dates shown on the map represent the anticipated years of construction and are subject to change based on budgetary issues, adjacent projects. resident input and other factors.
Not all bituminous roadways within the City are shown. If a road is not highlighted then the potential reconstruction date is beyond the City's long term planning process
The City of Edina 's street improvement policy is to assess residents for a portion of the roadway reconstruction costs Public ul&ty improvements are paid for from the City's utility fund
Extensive evaluation regarding the condition of the bituminous pavement, sanitary sewer, storm sewer and water main were used to set the priority of roadway improvements.
This map only addresses local bituminous streets and does not address State -Aid routes or concrete streets within the City.
Living Streets Policy
Introduction
Living streets balance the needs of motorists, bicyclists, pedestrians and transit riders in ways that promote
safety and convenience, enhance community identity, create economic vitality, improve environmental
sustainability, and provide meaningful opportunities for active living and better health. The Living Streets Policy
defines Edina's vision for Living Streets and the principles and plans that will guide implementation.
The Living Street Policy ties directly to key community goals outlined in the City's 2008 Comprehensive Plan.
Those goals include safe walking, bicycling and driving, reduced storm water runoff, reduced energy
consumption, and promoting health. The Living Streets Policy also compliments voluntary City initiatives such the
"do.town" effort related to community health, and the Tree City USA and the Green Step Cities programs related
to sustainability. In other cases, the Living Street Policy will assist the City in meeting mandatory requirements set
by other agencies. For example, the Living Streets Policy will support the Citys Storm Water Pollution Prevention
Plan which addresses mandates established under the Clean Water Act.
The Living Streets Policy provides the framework for a Living Streets Plan. The Living Streets Plan will address how
the Policy will be implemented by providing more detailed information on street design, traffic calming, bike
facilities, landscaping and lighting, as well as best practices for community engagement during the design
process. Lastly, existing and future supporting plans such as the Bicycle Plan, Active Routes to Schools, Sidewalk
Priority Plan and the Capital Improvement Plan will help to identify which projects are priorities with respect to
this Policy.
Living Streets Vision
Edina is a place where...
• Transportation utilizing all modes is equally safe and accessible;
• Residents and families regularly choose to walk or bike;
• Streets enhance neighborhood character and community identity;
• Streets are safe, inviting places that encourage human interaction and physical activity;
• Public policy strives to promote sustainability through balanced infrastructure investments;
• Environmental stewardship and reduced energy consumption are pursued in public and
private sectors alike; and
• Streets support vibrant commerce and add to the value of adjacent land uses.
Living Streets Principles
The following principles will guide implementation of the Living Streets Policy. The City will incorporate
these principles when planning for and designing the local transportation network and when making
public and private land use decisions.
All Users and All. Modes
The City will plan, design, and build high quality transportation facilities that meet the needs of
the most vulnerable users (pedestrians, cyclists, children, elderly, and disabled) while enhancing
safety and convenience for all users, and providing access and mobility for all modes.
Connectivity
• The City will design, operate, and maintain a transportation system that. provides a highly
connected network of streets that,accommodate all modes of travel.
• The City will seek opportunities to overcome-barriers to active transportation. This includes
preserving and repurposing existing. rights -of -way, and adding new rights -of -way to enhance
connectivity for pedestrians, bicyclists, and transit.
• the City will prioritize non- motorized improvements to key destinations such as public
facilities,'public transit, the_regional transportation network and commercial areas.
• The City will require new developments to provide interconnected street and sidewalk
networks that connect to existing or planned streets or sidewalks on the perimeter of the
development.
• Projects will include consideration of the logical termini by mode. For example, the logical
termini for a bike lane or sidewalk may extend beyond the traditional limits of a street .
construction or reconstruction project, in order to ensure multimodal connectivity and
continuity.
Application
The City will apply this Living Streets Policy to all street projects including those involving
operations, maintenance, new construction, reconstruction, retrofits, repaving, rehabilitation,
or changes in the allocation of pavement space on an existing roadway. This also includes
privately built roads, sidewalks, paths and trails.
• The City will act as an advocate for Living Street principles when a local transportation or land
use decision is under the jurisdiction of another agency.
• Living Streets may be achieved through single projects or incrementally'through a series of
smaller improvements or maintenance activities over time.
• The City will draw on all sources of transportation funding to implement this Policy and
actively pursue grants, cost sharing opportunities and other new or special funding sources
as applicable.
• All City departments will support the vision and principles outlined in the Policy in their
work.
Exceptions
Living Streets principles will be included in all street construction, reconstruction, repaving, and
rehabilitation projects, except under one or more of the conditions listed below. City staff will document
proposed exceptions as part of the project proposal.
2
Exceptions:
• A project involves only ordinary maintenance activities designed to keep assets in serviceable
condition, such as mowing, cleaning, sweeping, spot repair, concrete joint repair, or pothole
filling, or when interim measures are implemented on a temporary detour. Such maintenance
activities, however, shall consider and meet the needs of bicyclists and pedestrians.
• The City exempts a project due to an excessively disproportionate cost of establishing a
bikeway, walkway; or transit enhancement as part of a project.
• The City determines that the construction is not practically feasible or cost effective because of
significant or adverse environmental impacts to waterways, flood plains, remnants or native
vegetation, wetlands, or other critical areas.
Desien
The City will develop and adopt guidelines as. part of the Living Streets Plan to direct the planning,
funding, design, construction, operation, and maintenance of new and modified streets, sidewalks,
paths and trails. The guidelines will allow for context - sensitive designs.
The City's design guidelines will:
• Keep street pavement widths to the minimum necessary.
• Provide well- designed pedestrian accommodation in the form of sidewalks or shared -use
pathways on all arterial and collector streets and on local connector streets as determined by
context. Sidewalks shall also be required where streets. abut a public school, public building,
community playfield or neighborhood park.. Termini will 'be determined by context.
• Provide frequent, convenient and safe street crossings. These may be at intersections designed
to be pedestrian friendly, or at mid -block locations where needed and appropriate.
• Provide bicycle accommodation on alb primary bike routes.
• Allocate right -of -way for boulevards.
• Allocate right -of -way for parking only when necessary and not in conflict with Living Streets
principles.
• Consider streets as part of our natural ecosystem and incorporate landscaping, trees, rain
gardens and other features to improve air and water quality..
The design guidelines in the Living Streets Plan will be incorporated into other City plans, manuals,
rules,, regulations, and programs as appropriate. As new and better practices evolve, the City will
update the Living Streets Plan.
Context Sensitivity
Although many streets look more or less the same, every street is a unique combination of its
neighborhood, adjacent land uses, natural features, street design, users, and modes. To accommodate
these differences, the City will:
• Seek input from stakeholders;
• Design streets with a strong sense of place;
• Be mindful of preserving and protecting natural features, such as waterways, trees, slopes, and
ravines;
• Be mindful of existing land uses and neighborhood character; and
Coordinate with business and property owners along commercial corridors to develop vibrant
commercial districts.
Benchmarks and Performance Measures
The City will monitor and measure its performance relative to this Policy. Benchmarks demonstrating
success include:
• Every street and neighborhood is a comfortable place for walking and bicycling;
• Every child can walk or bike to school or a park safely;
• Seniors, children, and disabled people can cross all streets safely and comfortably;
• An active way of life is available to all;
• There are zero traffic fatalities or serious injuries;
• No unfiltered street water flows into local waterways; storm water volume is reduced; and
• Retail streets stay or become popular regional destinations.
The City will draw on the following data to measure performance. Additional performance measures may
be identified as this Policy is implemented.
• Number of crashes or transportation - related injuries reported to the Police Department.
• Number and type of traffic safety complaints or requests.
• Resident responses to transportation related questions in resident surveys.
• Resident responses to post - project surveys.
• The number of trips by walking, bicycling and transit (if applicable) as measured before and
after the project.
• Envision ratings from the Institute for Sustainable Infrastructure.
• Speed statistics of vehicles on local streets.
Implementation
The goal of this Policy is to define and guide the implementation of Living Streets principles. Several
steps still need to be taken to reach this goal. The first step will be to develop a Living Streets Plan to
guide the implementation of the Policy. The Plan will:
• Identify and implement standards or guidelines for street and intersection design, universal
pedestrian access, transit accommodations, and pedestrian crossings;
• Identify and implement standards or guidelines for streetscape ecosystems, including
street water management, urban forestry, street furniture, and utilities;
• Identify regulatory demands and their relationship to this Policy (ADA /PROWAG, MPCA,
MNMUTCD, MnDOT state aid, watershed districts);
• Define the process by which residents participate in street design and request Living Streets
improvements; and
• Define standards for bicycle and pedestrian connectivity to ensure access to key public, private
and regional destinations.
4
Additional implementation steps include:
• Communicate this Policy to residents and other stakeholders; educate and engage on an
ongoing basis;
• Update City ordinances, engineering standards, policies and guidelines to agree with this
Policy;
• Inventory building and.ioning codes to bring these into agreement with Living Streets
principles as established by-this Policy;
• Update and document maintenance policies and practices to support Policy goals;
• Update and document enforcement policies and practices to ensure safe streets for all modes;
• Incorporate Living Streets concepts in the next circulation of the City's general plans
(Comprehensive' Plan, Bicycle Plan, Active Routes to School Plan, etc.);
• Incorporate Living Streets as a criteria when evaluating transportation priorities in the Capital
Improvement Plan (CIO);
• Review and update funding policies to ensure funding sources for Living Streets projects; and
• Coordinate with partner jurisdictions to achieve goals in this Policy.
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SEH No. EDINA 124747
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January 30, 2014
Building a Better World
for -:All of,Us®
E iglhe&i I'Aixh,tects:I Planners I'ScieniN6
54th Street and Arden Park Area
Stormwater Management Plan
Edina, Minnesota
SEH No. EDINA 124747
January 30, 2014
Short. Elliott Hendrickson Inc.
3535 Vadnais Center Drive
St. Paul, MN 55110 -5196
651.490.2000
Table of Contents
Page
1.0 Introduction; and Project Background .................................:... ..............................1
Table 2
2.0 Applicable .
pp cable Rules,;Regulations, and Policies ..........................................................
1
2.1 General NPDES Permit for MS4s ....................................:. ..:............................
1
2.2 NPDES Construction Stormwater General Permit ..........:.. ...............................
2
2.3 MCWD Regulatory Rules ................................................... ...............................
2
2.4 City of Edina Policies, ...... ............ 7 ......................................... ...........................
2
3.0 Analysis of Alternatives ..............................................::.:......... ...............................
3
3.1 Stakeholder Engagement Feedback ................:................. ...............................
3
3.2 54th Street Reconstruction Opportunities ........................... ...............................
4
3.2.1 Analysis and Results .............................................. ::.............................
4
3.3 Arden Park BMP Opportunities .......................................... ...............................
6
3.3.1 Analysis and Results ............................ .....:.:.:........ .......:.......................
7
3.3.2 Creek Grade Control Structure .................. <.:::........ ...............................
8
3.4 Area -Wide BMP Opportunities ............................. :.............................................
8
3.5 Non - Structural Improvements .....:.............................:......... ..............................9
4.0 Recommendations and Conclusions ................:..........::......... ...............................
9
List of Tables
Table 1
P8 Model Input Parameters ..................................... ............................... 5
Table 2
P8 Model Results Summary .................................:.. ............................... 6
Table 3
SHSAM Watershed Input Properties ......... :........................................... 6
Table 4
Arden Park BMP Summary .... :................................................................ 8
Table 5
Improvement Cost - Benefit Summary ..................... ............................... 10
SEH is a registered trademark of Short Elliott Hendrickson Inc.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page i
Stormwater Management Plan
54th Street and Arden Park Area
Prepared for City of Edina, Minnesota
1.0 Introduction and Project Background
The Arden Park Area is a neighborhood in northeast Edina bordered on the north by 501h
Street, on the east by France Avenue, on the west by Wooddale, and on the south by 56'h
Street. Arden Park, an 18 -acre park along Minnehaha Creek has a large centrally located
presence. within the primarily residential neighborhood. The park features many recreational
amenities:including skating/hockey rinks, a warming house, playground equipment, an
unfinished baseball diamond, a grass field, and paths throughout the park and over the creek.
The City of Edina is planning to reconstruct 54`h Street within the Arden Park Area from
France Avenue to Wooddale Avenue and has hired SEH to develop this stormwater
management plan in concurrence with the preliminary design for the street and bridge
reconstruction. The collaborative and closely integrated approach of both projects leveraged a
substantial and transparent stakeholder engagement plan.
The objective of this stormwater management- plan is to report the consensus -based preferred
solutions to stormwater runoff in the Arden Park neighborhood and requirements of the 54`h
Street project consistent with the regulations and policies of the City of Edina, the Minnehaha
Creek Watershed District (MCWD), and Minnesota Pollution Control Agency (MPCA). This
plan also contains a narrative of the results of proposed stormwater management
improvement scenarios and methods of analysis used to arrive at those results for the
technical partners like the MCWD and stakeholders like MCWD and MPCA.
2.0 Applicable Rules, Regulations, and Policies
2.1 General NPDES Permit for MS4s
Minnehaha Creek is a prominent and valued natural resource in the neighborhood and is on
the State of Minnesota's §303(d) list of impaired waters for fecal coliform bacteria, chloride,
and dissolved:oxygen, as well as due to its impaired fish community. The downstream
waterbody, Lake Hiawatha also has a nutrient impairment. These impairments threaten the
aquatic life and recreational uses. Many of these impairments can be partially attributed to
untreated stormwater runoff from urbanized areas directly discharging into the creek through
storm sewer. The Clean Water Act and U.S. Environmental-Protection Agency (USEPA)
regulations require that states develop Total Maximum Daily Loads (TMDLs) for waters on
the §303(d) list..
The City of Edina is a permitted Municipal Separate Storm Sewer System (MS4) through The
National Pollution Discharge Elimination System ( NPDES) permit program. As an MS4, the
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 1
City of Edina is required to have a,Stormwater Pollution Prevention Program (SWPPP) and
comply with Waste Load Allocations (WLAs),of. USEPA approved TMDLs. The Minnehaha
Creek -Lake Hiawatha TMDL is currently in the-draft/public notice stages of the TMDL
approval process and the Minnehaha Creek chloride impairment is being addressed by the
Twin Cities Metropolitan Area Chloride Project.
2.2 NPDES Construction Stormwater General Permit
An NPDES Construction Stormwater General Permit is required for land disturbances from
construction. activity of equal to or,greater than one acre. Since the 50 Street reconstruction
project will disturb greater than one acre of land, the aforementioned permit and the
associated Stormwater Pollution Prevention Plan,(SWPPP) will be required. Within the
SWPPP, project appropriate erosion prevention practices, sediment control practices,
inspections and maintenance, pollution prevention measures and final stabilization shall be
documented. The 54th Street project will not exceed the threshold of replacing one.or more
acres of pervious surfaces with impervious surfaces and therefoie the permanent stormwater
management system requirements of the NPDES permit are not applicable.
2.3 MCWD Regulatory Rules
The Arden Park Area falls within the jurisdiction of the.MCWD and projects are subject to
the MCWD permitting process and regulatory rules. Based on preliminary typical sections
presented in the Draft 54`h Street Roadway Reconstruction Feasibility Study, the project will
create approximately 5,000 square feet of net new impervious surface. Because the 54`h Street
project is a linear project creating less than 10,000 square feet of new impervious surface the
project is exempt from the Stormwater Management Rule. Other MCWD Rules such as the
Erosion Control Rule and the Waterbody Crossing & Structures Rule will still apply.
2.4 City of Edina Policies
One of the goals of the project is integrating elements of the City's Living Streets Policy and
sustainable infrastructure. The goals of the Living Streets Policy include safe walking,
bicycling and driving, reduced stormwater runoff, reduced energy consumption, and
promoting health. To assess the sustainable infrastructure elements staff are utilizing a
sustainability scoring system for this project called ENVISION TM.The ENVISIONTM system
will help measure what effect project decisions and recommendations have on sustainability.
The rating.system includes credits organized` into five categories:- quality of life, leadership,
resource allocation, natural world, and climate and risk. More details on the project's
ENVISIONTM evaluation are available in the Draft 54`h Street Roadway Reconstruction
Feasibility Study.
The City's Comprehensive Water Resources Management Plan includes goals and policies
related to runoff management and flood control, water quality management, and wetland
protection. Specific policies and standards applicable. to the 54`h Street reconstruction project
include:
• New stormwater conveyance systems should be designed to convey flows from the 10-
year frequency, 'h -hr storm.
• Peak flow rates limited in accordance with applicable MCWD rules
• Stormwater retention is required in accordance with applicable MCWD rules
• Stormwater retention/detention facilities must be designed according to the most current
technology as reflected in the MPCA publication Protecting Water Quality in Urban
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 2
Areas, March 2000, the Minnesota Stormwater Manual (2008), or the applicable MCWD
rules, whichever are more restrictive.
3.0 Analysis of Alternatives
3.1 Stakeholder Engagement Feedback
In June and July. of 201`3, more than 450 community members offered issues and needs for
both projects through an extensive stakeholder input process. Based on that input, the
consultant team developed a variety •of design components to receive feedback at an August
19'h workshop and through. an online survey: Stormwater related design components
presented at the workshop included:
• Regional filtration basin — a large stormwater basin that does not contain permanent
standing water
• Underground retention — a series of larger pipes or chambers underground for storage and
slow release of runoff
• Porous paving — paving or bricks or a special mix of asphalt or concrete that has pores for
water to soak through
• Green roof — a roof that is partially or completely covered with vegetation and a growing
medium
• Cisterns /reuse — a system for collecting stormwater and storing it until it's needed for
other beneficial uses
• Snowmelt system — embedded electric cables or hydronic tubing under hardscapes that
melt `snow or ice
• SAFL baffle in sump manhole —.a baffle to promote sediment and debris settling in a
manhole with storage below the outlet pipe
• Grass pavers - a product for grass reinforcement of trafficked areas like overflow grass
parking
• In -park filtration basin (turf) — a small grassed stormwater basin that does not contain
permanent standing water
• In -park filtration basin (native plants) - a small planted stormwater basin that does not
contain permanent standing water
• Catch basin inserts — device . that traps trash, debris, sand, silts, and other contaminates in
runoff before entering the pipe system
• Tree trenches — trees planted in amended soils and rock to capture runoff and store /treat it
underground
• Rain gardens /grass swales - a planted depression or grassed swale that allows collected
stormwater to infiltrate
• Educational signage — signs to educate and encourage the public to recognize water
resource issues and solutions
• Buckthorn removal /reforestation — buckthorns are non - native shrubs or small trees that
crowd out native plants
Overall the stakeholders had a general understanding and were supportive of the goals for
stormwater management. However, a number of the design components in this category
garnered a range of both positive and negative feedback. The positive comments varied,
while most of the negative comments were about some of the large -scale components and
focused on cost, maintenance, size, and location, and aesthetics. There was a lot of feedback
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 3
on filtration design components, with generally positive feelings about including native
plants. Stakeholders generally favored maintaining green space and existing park uses, and
ensuring that any new design components address water safety especially in play areas.
3.2 54a' Street Reconstruction Opportunities
The existing geometry of the intersections at Park Place and Minnehaha Boulevard creates
large surface areas of pavement and intersection corners with long radius curb - lines. The
proposed project will reduce the curb radii at the intersections of Park Place and Minnehaha
Boulevard creating an area of green space in the boulevard extension ideal for rain gardens as
illustrated below.
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The project will install new concrete curb and gutter and a trunk storm sewer pipe and inlet
system meeting State Aid minimum design standards to capture and convey stormwater.
Reconstructing the storm sewer as part of the street reconstruction project also provides
opportunities for enhancements such as a SAFL baffle in sump manholes which would be
ideally located in the last on -road manholes up gradient of the creek outfall to maximize the
area of stormwater treated.
3.2.1 Analysis and Results
Two rain gardens at the intersections at Park Place and Minnehaha Boulevard were modeled in P8 to
approximate load removals on an average annual basis. It is assumed that the rain gardens will be designed to
either receive direct surface runoff through curb cuts or as offline practices with storm sewer bypass once the
capacity of the rain garden is reached. It was also assumed that the rain gardens will function as an infiltration
practice without an underdrain (as opposed to a filtration practice with an underdrain). The following Table 1
list the inputs assumed for the P8 model.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 4
Table 1
P8 Model Input Parameters
Parameter
Park Place
Rain Garden
Minnehaha
Boulevard Rain
Garden
Hourly Preci -File
Msp 989. c _
Dail Air Temp. File
Ms 4889.tm
Particle File
Nurp50.p8p
Start Date
1/2/1949
Keep Date
1/2/1949
Stop Date
8/31/1989
Total Watershed Area (ac)
3.34
1.17
Pervious Area CN
58
58
Indirectly Connected Impervious
fraction
0.5
0.0
Directly Connected Impervious,
not swept fraction
0.15
0.5
Device Type
INF BASIN
INF BASIN
Bottom area (ac)
0.000
0.001
Storage pool area (ac)_
0.009
0.012
Storage pool volume ac -ft
0.008
0.012
Infiltration Rate (in/hr)_
0.8
0.8
Void Volume ( %)
100
100
Note: Default P8 parameters were used if not indicated
The total suspended solids (TSS) and total phosphorus (TP) annual load summary is presented in Table 2
below. In addition to providing water quality benefits, the practices also provide a combined runoff volume
abstraction benefit on the order of 850 cubic feet (equivalent to one inch of volume control for approximately
10,000 square feet of impervious surface).
Stormwater Management Plan
City of Edina, Minnesota
EDINA.124747
Page 5
Table 2
P8 Model Results Summary
To.estimate the potential TSS load removals provided by a SAFL baffle or similar enhanced
I ater quality structures, a SHSAM model (modeling software provided by Barr Engineering
Co.) was utilized. The key weather inputs. for SHSAM were 15- minute rainfall data from
Golden Valley, MN and daily temperature data for the years of 1995 -2007. The MNDOT-
Road Sand Particle Size Distribution was assumed at a default concentration of 200 mg/1 for
the water entering the structures during model simulations'. The key watershed properties
input.into SHSAM are shown below in Table 3. The model .. simulations were run assuming a
4 ft diameter manhole with a sump depth of 4 ft and ,a 157 pipe flowing into the SAFL Baffle.
The average yearly load removed and removal efficiency.from 1995 -2007 for proposed
structure #104 was 790 lbs of TSS /yr and 31.2 %, respectively. The average yearly load
removed and removal efficiency from 1995 -2007 for proposed structure #204 was 949 lbs of
TSS /yr and 71.2 %, respectively.
Table 3
SHSAM Watershed Input Properties
Water Quality
Structure No.
Park Place Rain
Minnehaha
Hydraulic
Length ft
Parameter
Garden
Boulevard Rain
Total
30
640
Garden
70
TSS Total Inflow
30
950.
lbs/ r)
637
.398
1035
TSS Surface Outflow.
(lbs/ r)
338
84
422
TSS Removed
(lbs/ r .
299
314
613
TP Total Inflow
(lbs/ r)
2.0
1.3
3.3
TP Surface Outflow
lbs/ r
1.4
0.5
1.8
TP Removed
(lbs/ r)
0.6
0.8
1.4
To.estimate the potential TSS load removals provided by a SAFL baffle or similar enhanced
I ater quality structures, a SHSAM model (modeling software provided by Barr Engineering
Co.) was utilized. The key weather inputs. for SHSAM were 15- minute rainfall data from
Golden Valley, MN and daily temperature data for the years of 1995 -2007. The MNDOT-
Road Sand Particle Size Distribution was assumed at a default concentration of 200 mg/1 for
the water entering the structures during model simulations'. The key watershed properties
input.into SHSAM are shown below in Table 3. The model .. simulations were run assuming a
4 ft diameter manhole with a sump depth of 4 ft and ,a 157 pipe flowing into the SAFL Baffle.
The average yearly load removed and removal efficiency.from 1995 -2007 for proposed
structure #104 was 790 lbs of TSS /yr and 31.2 %, respectively. The average yearly load
removed and removal efficiency from 1995 -2007 for proposed structure #204 was 949 lbs of
TSS /yr and 71.2 %, respectively.
Table 3
SHSAM Watershed Input Properties
Water Quality
Structure No.
Drainage
Area ac
Impervious
%
Hydraulic
Length ft
Average
Sloe %
Pervious CN
104
6.06
30
640
4.7
70
204
3.15
30
950.
3.2
70
3.3 Arden Park BMP Opportunities
Within Arden Park itself, a couple of key messages were heard during the input process: the
need to maintain the current active use areas; the need to maintain safety in and around water
areas and the desire to have systems that fit the natural ..look of the park. Because several of
the larger trunk storm lines enter the creek within the limits of the park, the park areas present
an excellent opportunity to remove pollutants from storm water runoff prior to discharging to
the creek. Opportunities include a combination of infiltration/bioretention practices at
selected locations to treat street runoff or storm pipe discharges.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 6
Arden Park BMP opportunities are displayed in Figure 1. Locations shown on the map are
intended to identify general locations. This preliminary plan is not intended to provide
detailed designs for these areas that include the size, shape and planting materials. That said,
input was very clear that there is a great need to maintain the active park area. To accomplish
this, the recommendations of this plan are to create smaller, linear, or underground practices
that provide treatment and fit the aesthetics of the park, but that take up little or no active park
area.
One concept that should be explored further as future phases of stormwater improvements
progress is more intense grading in the park that would raise the active park areas that are
currently unusable at times due to wet soil conditions. At the same time, the outer edges of
the park would be lowered to provide rain garden or shallow swales for treatment and
conveyance of the stormwater around the active areas instead of directly through them. The
photos below show an example of a similar project completed in a park in Maplewood. That
project was developed through an extensive public input and park planning effort and has
been a huge success and improvement for the local residents.
3.3.1 Analysis and Results
The five BMP opportunities within Arden Park identified in Figure I were analyzed at a
planning level scale using the MIDS calculator. It was assumed that the soils were silty sand
(HSG B) and the drainage catchments were residential land use with roughly 40% impervious
area and 60% managed turf. Approximate pollutant removal estimates for each BMP are
summarized in Table 4.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 7
Table 4
Arden Park BMP Summary
3.3.2 Creek Grade Control Structure
MCWD has investigated the removal of the grade control structure in Minnehaha Creek near
the 54`h Street crossing. The existing structure creates unique whitewater kayaking
opportunities for experienced users during high flow conditions; however, many stakeholders
have expressed concern that the rapids conditions are unsafe for a majority of lesser
experienced users. In addition, the structure has also been identified as a barrier to fish
passage and inhibits aquatic habitat upstream. Conceptual design alternatives for improving
fish passage and ecological integrity while maintaining the recreational functionality for
kayakers have been evaluated and are discussed in more detail in the Minnehaha Creek 54th
Street Barrier Removal technical memorandum dated November 22, 2013.
3.4 Area -Wide BMP Opportunities
The overall study area for this stormwater system review and analysis includes the area
bounded roughly by France Avenue to the east, West 540' Street to the south, Wooddale
Avenue to the west and 50'h Street to the north. The commercial /retail area along France
Avenue and north of 50th is included in the study area as it contributes storm water runoff to
the creek in the northern portions of Arden Park.
One of the primary goals for expanding the study area beyond the immediate project limits of
the West 54`h Street project was to look for opportunities to better manage and treat
stormwater that currently discharges to the creek directly with little to no treatment..A second
factor was to identify opportunities to address any local street flooding in the residential areas
and improve the nuisance drainage conditions in Arden Park.
Several potential improvement opportunities exist within the current drainage system and are
identified in Figure 2. While additional options were discussed during the stakeholder input
process, those shown in Figure 2 are the ones that had the most support and /or are located
where they can be most effective at achieving the City and Watershed District goals for
improved water quality.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 8
Drainage
Volume
Annual TP
Annual TSS
Area
Capacity
Reduction
Reduction
BMP ID
ac
(ft')
Ibs)
(Ibs
Bioretention
Basin 1
5.94
3420
3.20
580
Bioretention
Basin 2
17.46
7170
8.80
1599
Bioretention
Basin 3
5.71
5130
4.18
759
Underground
Infiltration
83.99
17584
29.91
5435
Grassed
Swale
7.00
4287
5.01
1050
3.3.2 Creek Grade Control Structure
MCWD has investigated the removal of the grade control structure in Minnehaha Creek near
the 54`h Street crossing. The existing structure creates unique whitewater kayaking
opportunities for experienced users during high flow conditions; however, many stakeholders
have expressed concern that the rapids conditions are unsafe for a majority of lesser
experienced users. In addition, the structure has also been identified as a barrier to fish
passage and inhibits aquatic habitat upstream. Conceptual design alternatives for improving
fish passage and ecological integrity while maintaining the recreational functionality for
kayakers have been evaluated and are discussed in more detail in the Minnehaha Creek 54th
Street Barrier Removal technical memorandum dated November 22, 2013.
3.4 Area -Wide BMP Opportunities
The overall study area for this stormwater system review and analysis includes the area
bounded roughly by France Avenue to the east, West 540' Street to the south, Wooddale
Avenue to the west and 50'h Street to the north. The commercial /retail area along France
Avenue and north of 50th is included in the study area as it contributes storm water runoff to
the creek in the northern portions of Arden Park.
One of the primary goals for expanding the study area beyond the immediate project limits of
the West 54`h Street project was to look for opportunities to better manage and treat
stormwater that currently discharges to the creek directly with little to no treatment..A second
factor was to identify opportunities to address any local street flooding in the residential areas
and improve the nuisance drainage conditions in Arden Park.
Several potential improvement opportunities exist within the current drainage system and are
identified in Figure 2. While additional options were discussed during the stakeholder input
process, those shown in Figure 2 are the ones that had the most support and /or are located
where they can be most effective at achieving the City and Watershed District goals for
improved water quality.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 8
Opportunities range from trash/debris,removal practices such as retrofitting existing
manholes with sumps and SAFL Baffles to raingardens and streambank stabilization.
Identified in Figure 2 for area -wide improvements are:
• Ideal SAFL Baffle locations in the last on -road manholes up gradient of the creek outfall
4� Residential parcels with suitable life conditions on the low point of city blocks as priority
locations of raingardens, and
• Private parcels adjacent to.Minneliaha,Creek as candidates for streambank stabilization
projects.
In addition, the study has identified some practices that can be incorporated into the 50'x' and
France business area and neighborhood churches as redevelopment projects occur. Figure 2
identifies a few of the options discussed with business owners during the stakeholder process.
3.5 Non - Structural Improvements
Buckthorn removal throughout the park and neighborhood received unanimous and positive
support through the stakeholder engagement feedback. There are significant opportunities
within the park and on private parcels adjacent to the creek to remove buckthorn and restore
native plant communities. Although it's difficult to numerically quantify the benefits of
native plants, when used as a buffer between turf and the creek provide water quality benefits
by preventing erosion, filtering polluted runoff, and discouraging geese which can contribute
to elevated fecal coliform bacteria in the creek.
The 50'' and France Business Association stakeholders showed a strong interest in the
potential to utilize alternative deicing agents on the sidewalks and pavement which could
both lessen the chloride concentration of runoff and diminish corrosion of embedded metals
in concrete and thereby lengthening the life span of parking structures.
4.0 Recommendations and Conclusions
The implementation of the improvements discussed within this report can categorized on
three distinct levels:
• Level 1: 54th Street Reconstruction Stormwater Improvements
• Level 2: Watershed Source Control/Non- structural Improvements
• Level 3: End- of- Pipe/Regional Treatment
A summary of the estimated benefit and cost per benefit for each of the improvements by
category is provided in Table 5.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 9
Table 5
Improvement Cost - Benefit Summary
BMP
Volume
Annual TSS
Annual TP
Cost
$ /lb TSS
$ /lb TP
Capacity
Removal
Removal
Estimate2
ft
Ibs
Ibs
Level 1: 54th Street Reconstruction Stormwater Improvements
SAFL Baffle
MI-1-104
NA
790
NA'
$4,500
$6
NA'
SAFL Baffle
MI-204
NA
949
NA'
$4,500
$5
NA'
Park Place Rain
Garden
350
299
0.6
$5,618
$19
$9,363
Minnehaha Blvd
Rain Garden
522
314
0.8
$8,378
$27
$10,473
Level 2: Watershed Source Control /Non- structural Improvments
Residential Rain
Garden
Streambank
Stabilization
TBD - Based on property owner participation, drainage area to treatment area ratio,
and other factors not readily available or quantifiable
Native Restoration
Alternative
Deicin Agents
Impervious Area
Reduction
Level 3: End -of -Pipe /Regional Treatment
Bioretntion
Basin 1
3420
580
3.2
$54,891
$95
$17,153
Bioretntion
Basin 2
7170
1599
8.8
$115,079
$72
$13,077
Bioretntion
Basin 3
5130
759
4.2
$82,337
$108
$19,604
Grassed
Swale
4287
1050
5.0
$348,322
$332
$69,664
Undergound
Infiltration
17584
5435
29.9
1 $4,007,569
$737
$134,032
'Although these structures do not target phosphorus removal, they can remove phosphorus indirectly
by settling out phosphorus that adheres to sediments.
BBased on average construction cost per water quality volume found in Table 1 of Best Management
Practices Construction Cost, Maintenance Costs, and Land Requirements (Barr Engineering, 2011)
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 10
Although the City does need not do any permanent stormwater management for the 54`h
Street project based on WD standards, clean water credits can efficiently be generated for
TMDL goals within the project construction area with the cost effective Level 1
improvements.
For Level 2 improvement opportunities, the City may also choose to collaborate with MCWD
on providing.outreach and, opportunities for homeowner,raingardens and streambank
stabilization projects in the priority-areas identified. The City should also further explore the
potential in the strongly supported non - structural BMP options identified on City managed
property and right -of -way. Although the cost - benefit has not been quantified for this level of
implementation, it is usually more cost - effective to prevent pollution than to treat it after it
has entered stormwater conveyance systems or waterbodies.
Implementation of the Level 3 regional stormwater BMP improvements may be delivered by
a couple of different approaches. First, the City may choose to implement improvements as
part of a park improvement project, stand alone local stormwater improvement or through a
cooperative project with the watershed district: Second, as redevelopment projects occur in
the 50'' -France business area and neighborhood "churches, these project owners will need to
develop stormwater practices that.meet the requirements of the City, watershed and NPDES
Permit. When onsite improvement options are limited for private redevelopment, one
approach they may follow is to look at the off -site options shown in Figure 1 and work with
the City and watershed to implement these projects as a, complete or partial credit towards
meeting their site specific stormwater management needs.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 11
List of Figures
Figure 1 — Arden Park BMP Opportunities
Figure 2 — Area -Wide BMP Opportunities
Legend
BMPs
C3 Catchments
• Storm Sewer Structure
Storm Sewer
ProjectLimits
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Potental Bloretention 1
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1
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or r
Potential Grassed Swale
Arden Park BMP Opportunities
54th Street and Arden Park Area SWMP
Edina, Minnesota
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Figure
1
Legend
SAFL Baffle
• Storm Sewer Structure
rCommercial/Retail redevelopment
BMP OpportunitiesStorm Sewer ) Porous pavement
nderground storage
Streambank Stabilization
Raingarden
Rai ngarden / Streambank Stabilization
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Edina, Minnesota
AGENDA
CITY COUNCIL MEETING
CITY OF EDINA, MINNESOTA
CITY COUNCIL CHAMBERS
TUESDAY, APRIL I, 2014
5:30 P.M.
I. CALL TO ORDER
II. ROLL CALL
III. ARDEN PARK/MINNEHAHA WATERSHED DISTRICT PARTNERSHIP
IV. PUBLIC UTILITIES REVIEW
V. ADJOURNMENT
The City of Edina wants all residents to be comfortable being part of the public process. If you need assistance
in the way of hearing amplification, an interpreter, large -print documents or something else, please call 952-
927 -8861 72 hours in advance of the meeting.
SCHEDULE OF UPCOMING MEETINGS /DATES /EVENTS
Tues
Apr 1
Work Session- Arden Park /Minnehaha Watershed District
5:30 P.M.
COMMUNITY ROOM
Partnership & Public Utilities Review
Tues
Apr 1
Regular Meeting
7:00 P.M.
COUNCIL CHAMBERS
Tues
Apr 22
Business Meeting/Joint Meeting With Arts & Culture Comm.
5:30 P.M.
COMMUNITY ROOM
Tues
Apr 22
Regular Meeting
7:00 P.M.
COUNCIL CHAMBERS
Tues
May 6
Work Session — 501h & France Special Assessment Policy
5:30 P.M.
COMMUNITY ROOM
Edina Realty
Tues
May 6
Regular Meeting
7:00 P.M.
COUNCIL CHAMBERS
Tues
May 20
Work Session —Joint Session With HRRC /Former PW Site
5:00 P.M.
COMMUNITY ROOM
Redevelopment Process
Tues
May 20
Regular Meeting
7:00 P.M.
COUNCIL CHAMBERS
Mon
May 26
MEMORIAL DAY HOLIDAY OBSERVED — City Hall Closed
Tues
Jun 3
Work Session —Joint Meeting With Health Commission
5:30 P.M.
COMMUNITY ROOM
Tues
Jun 3
Regular Meeting
7:00 P.M.
COUNCIL CHAMBERS
Tues
Jun 17
Work Session — Community Vision.Consultant Interviews
5:00 P:M.
COMMUNITY ROOM
Tues
Jun 17
Regular Meeting
7:00 P.M.
COUNCIL CHAMBERS
To: MAYOR AND COUNCIL
From: Mark K. Nolan, AICP, Transportation Planner
Work Session Item #: III
Date: April I, 2014
Subject: Arden Park/Minnehaha Watershed District Partnership
Action D
Dlstusslon g
IMort�natlon ❑
Action Requested: .
Discussion and general direction regarding a proposed partnership with the Minnehaha Creek
Watershed District (MCWD) and Living Streets "Demonstration Project" for the Arden Park D 2015
neighborhood reconstruction project.
Information / Background:
The Living Streets Implementation Plan is currently being drafted and is anticipated to be ready for Council
approval by fall 2014. However, the Arden Park D neighborhood reconstruction project scheduled for next
year may be a unique opportunity to more immediately apply the vision and principals of the Living Streets
Policy (adopted by Council in August 2013). Opportunities include traffic calming techniques, improved
pedestrian network, streetscape enhancements, and stormwater best management practices (BMPs).
In February staff prepared a draft proposal (attached) that envisions a partnership between the City and the
MCWD to provide a local Living Streets model as applied to a neighborhood reconstruction project. Staff
from both agencies met twice (January and March 2014) to discuss potential partnership opportunities. The
mutual goal of this effort for the City and MCWD is to benefit the neighborhood and region by
implementing stormwater BMPs, which may include (but are not limited to) rain gardens, street trees and
porous pavement.
Staff wishes to discuss several key related issues with Councilmembers at this work session. These include:
• The potential to narrow streets from their current width
• Edge of roadway treatment on Minnehaha Blvd.
• Potential to restrict parking to one side of the street
• Maintenance of rain gardens
• Installation of sidewalks with boulevards
• Increased service level /associated cost
• Public and stakeholder engagement
Attachments:
Draft Proposal for Partnership with MCWD (with Appendices)
G: \PW \CENTRAL SVCS \ENG DIV\PROJECTS \IMPR NOS \BA391 Living Streets \Arden Proposal \WK SS Item III. Arden Park Watershed District Parinership.docx
City of Edina 4801 W. 50th St. Edina, MN 55424
PROPOSAL FOR .PARTNERSHIP
Arden Park andi "Arden Park D "` Neighborhood Street
Reco.nstr..uction
Living Streets Demonstration Project, Joint Grant Application
2/21/2014 DRAFT
Proposal Overview
This draft proposal envisions a partnership between the City of Edina (Gi.ty) and the Minnehaha
Creek Watershed District (District) to provide a local model of the "Living Streets" reconstruction
practice.
This proposal includes background information on;Edina Living Streets, and calls out potential
opportunities the 2015 "Arden .Park D" neighborhood street reconstruction and nearby parks and
natural resources. Also contained is a proposed form of partnership that suggests how the. City and
District can best work together.
Edina Living Streets
On August 20, 2013, the Edina City Council approved the Living Streets Policy. This policy included
the development of the Living Streets Plan to, in part, identify specific standards for stormwater
management, incorporate outside regulatory , requirements, and define the process for resident
participation in street design. The development of the Living Streets Plan is currently underway,
although the specific standards are still evolving.
"Living streets balance the needs of motorists, bicyclists,-pedestrians and transit riders in ways that
promote safety and convenience, enhance community identity, create economic vitality, improve
environmental sustainability, and provide meaningful opportunities for active living and better health. The
Living Streets Policy defines Edina's vision for Living Streets and the principles and plans that will guide
implementation."
Environmental sustainability, flood protection and clean water are key components of the policy
and the early influence of the District is a welcome. addition to putting these policies into,practice.
The Low Impact Development (LID) goals and techniques of Living Streets are closely related to
the District's goals for abstraction /filtration, water quality, public health, water quantity, best
management practices, education and communications, and recreation. Through this partnership,
the District's clean water expertise, education and outreach ability, and Master Water Steward
initiative will help guide and inform Living Streets.
Background
The Arden Park Area is unique in character and contains the regional resource of Minnehaha
Creek. The project area is a center for community, recreation, and business activities: bordered on
the north by two churches, on the northeast by the 50th and France business district, on the east by
two churches, private schools and mixed business and multifamily uses, on the south by 54th Street,
and along the west by Minnehaha Creek and Arden Park.
Page 1 of 5
In 2015 the City of Edina will reconstruct a portion of the Arden Park neighborhood. This project
will be an early application the Living Streets policy and implementation plan. The integration and
demonstration of clean water infrastructure should be a top priority in this creek -side
neighborhood. The Arden Park reconstruction project is an opportunity to provide significant
stormwater treatment for an area which currently drains directly to Minnehaha Creek, and also to
demonstrate Living Streets in.an. area that is :highly visible due to the proximity.of parks, trails,
Minnehaha Creek; and moderate- volume streets.
(See appendix for neighborhood map; Arden Park D project area, reconstruction schedule map,
and Figures I and 2 in 54' Street and Arden Park Area Stormwater Management Plan)
In 2013, the.City engaged the District in the planning and stakeholder engagement process
centered around the 2014 54' Street and. 54' Street. Bridge reconstruction .project. The project
team then held a substantive and transparent stakeholder engagement process. that shaped and
informed the project design and the 54th Street and Arden Park Area Stormwater Management
Plan.
Standard Reconstruction Process
The standard reconstruction process proposes the rehabilitation of existing utilities and road
network to meet the current service expectation. The repair of existing storm infrastructure is
generally included, as is the. development of an extensive network of sump drain line to solve
nuisance drainage problems. The projects adhere to District rules for linear transportation-
projects, meet -a no- net - increase standard and typically, the City voluntarily adds underground
sediment capture ,structures.
Stormwater from the 2015 Arden Park D project area and the greater 50' and France business
district currently flow directly untreated to the,creek. In a standard reconstruction process, this
pattern would continue with the potential. forsome additional sediment capture.
Opportunity
Living Streets
Living Streets reconstruction proposes the holistic review of existing service levels and the
consideration or addition `of pedestrian, bike, clean water and flood protection services. One of the
primary components of Edina's Living Streets vision is the active pursuit of environmental
stewardship, including setting goals for the reduction of storm water volume and unfiltered street
water flows into our local waterways. Living Street applies LID techniques such as impervious
surface reduction, bio- retention; filtration, sediment capture, and infiltration and;.reuse of
stormwater. These stormwater treatments should be applied in a cost effective and strategic way
to best integrate with various transportation modes and the neighborhood aesthetic.
Opportunities for sustainable infrastructure and LID are called out in the Stormwater Plan. This
plan could be expanded to include cost/benefit for individual watershed source controls described
as "Level 2" implementation priorities. The plan also describes the results of the stakeholder
engagement process. A detailed review of the stakeholder engagement summary found unanimous
support for natural area management, buckthorn removal, and conditional support for rain gardens,
tree trenches, and. regional native plant filtration basins. Support for these practices was
conditioned on maintenance of active use green space, high quality aesthetic and safety concerns
being met.
Page 2of5
Parks, Recreation and Natural Resources
Arden Park sits along the banks of the Minnehaha Creek and features active recreation in the form
of playground, hockey rink, and a recreational skating rink. Connecting trails that run through the
park and cross Minnehaha Creek provide passive recreation. There is a planned rehabilitation of
the Arden Park shelter in 2017. Minnehaha Creek is a high quality resource in this area and is used
for canoeing and kayaking and passive enjoyment. The 54' street crossing also includes a canoe
portage and an area used for whitewater kayaking.
Opportunities for non - structural and regional treatments called out in the Stormwater Plan include
native area restoration, buffer establishment, bio- retention, and infiltration features. The removal of
buckthorn and establishment of flowered prairie and buffers were rated highly by 54 h street
stakeholders and synchronize well with watershed and City goals for mixes of active and passive
recreation space.
Clean Water Service
The Edina stormwater utility uses performance measurements to judge opportunity for clean water
and flood protection improvement. Flood protection performance measures include peak rate and
volume runoff discharge measured in cubic feet per second and acre -feet, respectively. Clean water
performance measures include removal of sediment measured in tons and phosphorus measured in
pounds. A variety of potential clean water treatments were analyzed as part of the stormwater
report 54' Street Area Stormwater Management Plan, many of which appear cost effective. These
potential improvements ranged from structural to nonstructural and publically owned to privately
owned. Cost benefit criteria should be used across all clean water BMPs and project types to best
target public investment.
Form of Partnership
A partnership between the City of Edina and Minnehaha Creek Watershed District could take a
variety of forms. This form of partnership envisions three main deliverables:
1. Public neighborhood street reconstruction project and Living Streets demonstration.
2. Public parks, natural resource restoration and regional BMP retrofit project.
3. Living Streets implementation plan, template and toolkit.
A variety of workload or financial resources would be required of each partner. Here are
examples for consideration:
Minnehaha Creek Watershed District
• District grant funding for public -owned BMPs
• Preapprove cost -share formula for homeowner BMPs
• Statewide grant application and grant contract administration
• Technical assistance
• Public involvement and education assistance
• Homeowner BMP point of contact
City of Edina
• Public involvement and stakeholder process
• Design and engineering
Page 3 of 5
• Public bid (neighborhood public system, homeowner BMP coordination)
• Public bid (park and natural resource)
• Construction contract administration
• Creation of working Living Streets template /toolkit
• Natural resource restoration project, 5 -year maintenance
The extent of participation and integration of work are highly variable based on the project goals
and level of consultant support for design and construction administration. Here are example
minimum levels of participation:
1. Funding for detailed stormwater management plan, and sub watershed analysis.
2,: Staff time for joint grant applications.
3. 'Staff time for education, outreach and ongoing support.
Examples of additional watershed participation may include:
L. Assistance during sub watershed assessment, neighborhood - engagement, and /or
stakeholder involvement.
2. Master Water Steward coordination, public education and outreach
3. Assistance and participation during design
4. Coordination with residents installing BMPs during construction
5. Participation in Living Streets implementation plan development, template and toolkit
Example Schedule
1. Consider Proposal for Partnership
February — April 2014
2. PFA Project Priority List`Scoring Due
March 7, 2014
3. Professional Services Scope
April, 2014
4. Award Professional Services Contract
May, 2014
S. Sub- watershed Assessment
May - June, 2014
6. PFA Intended Use Plan Due
June 6, 2014 .
7. Pre - Approved Cost Share Decision
8. Stakeholder Engagement and Prelim Design
June — Sept. 2014
9. Public, Improvement Hearing
Sept — Oct. 2014
10. Clean Water Competitive Grant Due
November 2014
11. Open Bids, Award Project
Feb - March 2015
12. Start Construction
May 2015
13. Complete Construction
October 2015
Conclusion
Living Streets raises the bar for clean water, flood protection, bike and pedestrian services in street
reconstruction. This revaluation of services requires the attention and hard work of creative
professionals to design safe, seamless, and attractive new infrastructure that is cost effective,
increasingly sustainable and broadly supported by the local neighborhood.
The Arden Park D reconstruction project provides a unique opportunity to implement clean water
practices near the banks of Minnehaha Creek and to rewrite a standard City process creating an
example for future Living Streets reconstruction projects to follow. While the Living Streets Policy
is a reality in Edina, the trajectory of this change depends on close collaboration between City and
District, and the resulting acceptance of the local neighborhoods. We welcome your help.
Page 4 of 5
T
Please contact any of the following staff with comments and questions
Mark Nolan — Transportation Planner
City of Edina - Engineering Department.
7450 Metro Boulevard
Edina, MN 55439
mnolan @edinan.gov
Phone: 952 =8m26 -0322
Chad A. Millner, PE - Director of Engineering
City of Edina - Engineering Department
7450- Metro Boulevard
Edina, MN 55439
cmillner @edinamn.gov
Phone: 952- 826 -0318
Appendix
Arden Park D Neighborhood Map
Street Reconstruction Schedule
Edina Living Streets Policy
Stormwater Management Plan— 54th Street and Arden Park Area (January 30, 2014)
Maplewood Living Street Demonstration Project H erlink
Page 5 of 5
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Arden Park D Neighborhood Roadway Reconstruction
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Improvement No: BA-412 Engneedng Dept
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Note /Disclaimer
The dates shown on the map represent the anticipated years of construction and are subject to change based on budgetary issues, adjacent projects, resident input and other factors
Nol all bituminous roadways within the City are shown. If a road is not highlighted then the potential reconstruction date is beyond the City's long term planning process.
The City of Edina's street improvement policy is to assess residents for a portion of the roadway reconstruction costs. Public utility improvements are paid for from the City's utility lurid
Extensive evaluation regarding the condition of the bituminous pavement, sanitary sewer, storm sewer and water main were used to set the priority of roadway improvements.
This map only addresses local bituminous streets and does not address State -Aid routes or concrete streets within the City.
Living Streets Policy
Introduction
Living streets balance the needs of motorists, bicyclists, pedestrians and transit riders in ways that promote
safety and convenience, enhance community identity, create economic vitality, improve environmental
sustainability, and provide meaningful opportunities for active living and better health. The Living Streets Policy
defines Edina's vision for Living Streets and the principles and plans that will guide implementation.
The Living Street Policy ties directly to key community goals outlined in the City's 2008 Comprehensive Plan.
Those goals include safe walking, bicycling and driving, reduced storm water runoff, reduced energy
consumption, and promoting health. The Living Streets Policy also compliments voluntary City initiatives such the
"do.town" effort related to community health, and the_Tree City USA and the Green Step Cities programs related
to sustainability. In other cases, the Living Street Policy will assist the City in meeting mandatory requirements set
by other agencies. For example, the Living Streets Policy will support the City's Storm Water Pollution Prevention
Plan which addresses mandates established under the Clean Water Act.
The Living Streets Policy provides the framework for a Living Streets Plan. The Living Streets Plan will address how
the Policy will be implemented by providing more detailed information on street design, traffic calming, bike
facilities, landscaping and lighting, as well as best practices for community engagement during the design
process. Lastly, existing and future supporting plans such as the Bicycle Plan, Active Routes to Schools, Sidewalk
Priority Plan and the Capital Improvement Plan will help to identify which projects are priorities with respect to
this Policy.
Living Streets Vision
Edina is a place where...
• Transportation utilizing all modes is equally safe and accessible;
• Residents and families regularly choose to walk or bike;
• Streets enhance neighborhood character and community identity;
• Streets are safe, inviting places that encourage human interaction and physical activity;
• Public policy strives to promote sustainability through balanced infrastructure investments;
• Environmental stewardship and reduced energy consumption are pursued in public and
private sectors alike; and
• Streets support vibrant commerce and add to the value of adjacent land uses.
Living Streets Principles
The following principles will guide implementation of the Living Streets Policy. The City will incorporate
these principles when planning for and designing the local transportation network and when making
public and private land use decisions.
All Users and All Modes
The City will plan, design, and build high quality transportation facilities that meet the needs of
the most vulnerable users (pedestrians, cyclists, children, elderly, and disabled) while enhancing
safety and convenience for all users, and providing access and mobility for all modes.
Connectivity
• The City will design, operate, and maintain a transportation system that provides a highly
- connected network of streets that accommodate all modes of travel.
• The City will seek opportunities to overcome barriers to active transportation. This includes
preserving and repurposing existing rights -of -way, and adding new rights -of -way to enhance
connectivity for pedestrians, bicyclists,, and transit.
• The City will prioritize non - motorized improvements to key destinations such as public
facilities, public transit, the regional transportation network and commercial areas.
• The City will require new developments to provide interconnected street and sidewalk
networks that connect to existing or planned streets or sidewalks on the perimeter of the
development.
• Projects will include consideration of the logical termini by mode. For example, the logical
termini for a bike lane or sidewalk may extend beyond the traditional limits of a street
construction or reconstruction project, in order to ensure multimodal connectivity and
continuity.
Application
• The City will apply this Living Streets Policy to all street projects including those involving
operations, maintenance, new construction, reconstruction, retrofits, repaving, rehabilitation,
or changes in the allocation of pavement space on an existing roadway. This also includes
privately built roads, sidewalks, paths and trails.
• The City will act as an advocate for Living Street principles when a local transportation or land
use decision is under the jurisdiction of another agency.
• Living Streets may be achieved through single projects or incrementally through a series of
smaller improvements or maintenance activities over time.
• The City will draw on all sources of transportation funding to implement this Policy and
actively pursue grants, cost sharing opportunities and other new or special funding sources
as applicable.
• All City departments will support the vision and principles outlined in the Policy in their
work.
Exceptions
Living Streets principles will be included in all street construction, reconstruction, repaving, and
rehabilitation projects, except under one or more of the conditions listed below. City staff will document
proposed exceptions as part of the project proposal.
Exceptions:
• A project involves only ordinary maintenance activities designed to keep assets in serviceable
condition, such as mowing, cleaning, sweeping, spot repair, concrete joint repair, or pothole
filling, or when interim measures are implemented on a temporary detour. Such maintenance
activities, however, shall consider and meet the needs of bicyclists and pedestrians.
• The City exempts a project due to an excessively disproportionate cost of establishing a
bikeway, walkway, or transit enhancement as part of a project.
• The City determines that the construction is not practically feasible or cost effective because of
significant or adverse environmental impacts to waterways, flood plains, remnants or native
vegetation, wetlands, or other critical areas.
Desien
The City will develop and adopt guidelines as part of the Living Streets Plan to direct the planning,
funding, design, construction, operation, and maintenance of new and modified streets, sidewalks,
paths and trails. The guidelines will allow for context - sensitive designs.
The City's design guidelines will:
• Keep street pavement widths to the minimum necessary.
• Provide well- designed pedestrian accommodation in the form of sidewalks or shared -use
pathways on all arterial and collector streets and on local connector streets as determined by
context. Sidewalks shall also be required where streets abut a public school, public building,
community playfield or neighborhood park. Termini will be determined by context.
• Provide frequent, convenient and safe street crossings. These may be at intersections designed
to be pedestrian friendly, or at mid -block locations where needed and appropriate.
• Provide bicycle accommodation on all. primary bike routes.
• Allocate right -of -way for boulevards.
• Allocate right -of -way for parking only when necessary and not in conflict with Living Streets
principles.
• Consider streets as part of our natural ecosystem and incorporate landscaping, trees, rain
gardens and other features to improve air and water quality.
The design guidelines in the Living Streets Plan will be incorporated into other City plans, manuals,
rules, regulations, and programs as appropriate. As new and better practices evolve, the City will
update the Living Streets Plan.
Context Sensitivity
Although many streets look more or less the same, every street is a unique combination of its
neighborhood, adjacent land uses, natural features, street design, users, and modes. To accommodate
these differences, the City will:
• Seek input from stakeholders;
• Design streets with a strong sense of place;
• Be mindful of preserving and protecting natural features, such as waterways, trees, slopes, and
ravines;
• Be mindful of existing land uses and neighborhood character; and
• Coordinate with business and property owners along commercial corridors to develop vibrant
commercial districts.
Benchmarks and Performance Measures
The City will monitor and measure its performance relative to this Policy. Benchmarks demonstrating
success include:
• Every street and neighborhood is a comfortable place for walking and bicycling;
• Every child can walk or bike to school or a park safely;
• Seniors, children, and disabled people can cross all streets safely and comfortably;
• An active way of life is available to all;
• There are zero traffic fatalities or serious injuries;
• No unfiltered street water flows into local waterways; storm water volume is reduced; and
• Retail streets stay or become popular regional destinations.
The City will draw on the following data to measure performance. Additional performance measures may
be identified as this Policy is implemented.
• Number of crashes or transportation - related injuries reported to the Police Department.
• Number and type of traffic safety complaints or requests.
• Resident responses to transportation related questions in resident surveys.
• Resident responses to post - project surveys.
• The number of trips by walking, bicycling and transit (if applicable) as measured before and
after the project.
• Envision ratings from the Institute for Sustainable Infrastructure.
• Speed statistics of vehicles on local streets.
Implementation
The goal of this Policy is to define and guide the implementation of Living Streets principles. Several
steps still need to be taken to reach this goal. The first step will be to develop a Living Streets Plan to
guide the implementation of the Policy. The Plan will:
• Identify and implement standards or guidelines for street and intersection design, universal
pedestrian access, transit accommodations, and pedestrian crossings;
• Identify and implement standards or guidelines for streetscape ecosystems, including
street water management, urban forestry, street furniture, and utilities;
• Identify regulatory demands and their relationship to this Policy (ADA /PROWAG, MPCA,
MNMUTCD, MnDOT state aid, watershed districts);
• Define the process by which residents participate in street design and request Living Streets
improvements; and
• Define standards for bicycle and pedestrian connectivity to ensure access to key public, private
and regional destinations.
4
Additional implementation steps include:
• Communicate this Policy to residents and other stakeholders; educate and engage on an
ongoing basis;
• Update City ordinances, engineering standards, policies and guidelines to agree with this
Policy;
• Inventory building and zoning codes to bring these into agreement with Living Streets
principles as established by this Policy;
• Update and document maintenance policies and practices to support Policy goals;
• Update and document enforcement policies and practices to ensure safe streets for all modes;
• Incorporate Living Streets concepts in the next circulation of the City's general plans
(Comprehensive Plan, Bicycle Plan, Active Routes to School Plan, etc.);
• Incorporate Living Streets as a criteria when evaluating transportation priorities in the Capital
Improvement Plan (CIP);
• Review and update funding policies to ensure funding sources for Living Streets projects; and
• Coordinate with partner jurisdictions to achieve goals in this Policy.
Stormwater Management Plan
54th Street and Arden Park Area
Edina, Minnesota
SEH No. EDINA 124747
January 30, 2014
-A
SEH
Building a Better World
for All of Us*
Engineers I Architects I Planners I Scientists
54th Street and Arden Park Area
Stormwater Management Plan
Edina, Minnesota
SEH No. EDINA 124747
January 30, 2014
Short Elliott Hendrickson Inc.
3535 Vadnais Center Drive
St. Paul, MN 55110 -5196
651.490.2000
Table of Contents
Page
1.0 Introduction and Project Background ..................................... ..............................1
2.0 Applicable Rules, Regulations, and Policies .......................... ..............................1
2.1 General NPDES Permit for MS4s ...................................... ............................... 1
2.2 NPDES Construction Stormwater General Permit ............. ............................... 2
2.3 MCWD Regulatory Rules ................................................... ............................... 2
2.4 City of Edina Policies ......................................................... ............................... 2
3.0 Analysis of Alternatives ........................................................... ............................... 3
3.1 Stakeholder Engagement Feedback .................................. ............................... 3
3.2 54th Street Reconstruction Opportunities ........................... ............................... 4
3.2.1 Analysis and Results .............................................. ............................... 4
3.3 Arden Park BMP Opportunities .......................................... ............................... 6
3.3.1 Analysis and Results .............................................. ............................... 7
3.3.2 Creek Grade Control Structure ............................... ............................... 8
3.4 Area -Wide BMP Opportunities ........................................... ............................... 8
3.5 Non - Structural Improvements ............................................. ..............................9
4.0 Recommendations and Conclusions ...................................... ............................... 9
List of Tables
Table 1
P8 Model Input Parameters ..................................... ............................... 5
Table 2
P8 Model Results Summary .................................... ............................... 6
Table 3
SHSAM Watershed Input Properties ...................... ............................... 6
Table 4
Arden Park BMP Summary ...................................... ...............................
8
Table 5
Improvement Cost - Benefit Summary ..................... ...............................
10
SEH is a registered trademark of Short Elliott Hendrickson Inc.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page i
Stormwater Management Plan
54th Street and Arden Park Area
Prepared for City of Edina, Minnesota
1.0 Introduction and Project Background
The Arden Park Area is a neighborhood in northeast Edina bordered on the north by 50`h
Street, on the east by France Avenue, on the west by Wooddale, and on the south by 56`h
Street. Arden Park, an 18 -acre park along Minnehaha Creek has a large centrally located
presence within the primarily residential neighborhood. The park features many recreational
amenities including skating/hockey rinks, a warming house, playground equipment, an
unfinished baseball diamond, a grass field, and paths throughout the park and over the creek.
The City of Edina is planning to reconstruct 54th Street within the Arden Park Area from
France Avenue to Wooddale Avenue and has hired SEH to develop this stormwater
management plan in concurrence with the preliminary design for the street and bridge
reconstruction. The collaborative and closely integrated approach of both projects leveraged a
substantial and transparent stakeholder engagement plan.
The objective of this stormwater management plan is to report the consensus -based preferred
solutions to stormwater runoff in the Arden Park neighborhood and requirements of the 54`x'
Street project consistent with the regulations and policies of the City of Edina, the Minnehaha
Creek Watershed District (MCWD), and Minnesota Pollution Control Agency (MPCA). This
plan also contains a narrative of the results of proposed stormwater management
improvement scenarios and methods of analysis used to arrive at those results for the
technical partners like the MCWD and stakeholders like MCWD and MPCA.
2.0 Applicable Rules, Regulations, and Policies
2.1 General NPDES Permit for MS4s
Minnehaha Creek is a prominent and valued natural resource in the neighborhood and is on
the State of Minnesota's §303(d) list of impaired waters for fecal coliform bacteria, chloride,
and dissolved oxygen, as well as due to its impaired fish community. The downstream
waterbody, Lake Hiawatha also has a nutrient impairment. These impairments threaten the
aquatic life and recreational uses. Many of these impairments can be partially attributed to
untreated stormwater runoff from urbanized areas directly discharging into the creek through
storm sewer. The Clean Water Act and U.S. Environmental Protection Agency (USEPA)
regulations require that states develop Total Maximum Daily Loads (TMDLs) for waters on
the §303(d) list.
The City of Edina is a permitted Municipal Separate Storm Sewer System (MS4) through The
National Pollution Discharge Elimination System ( NPDES) permit program. As an MS4, the
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 1
City of Edina is required to have a Stormwater Pollution Prevention Program (SWPPP) and
comply with Waste Load Allocations (WLAs) of USEPA approved TMDLs. The Minnehaha
Creek -Lake Hiawatha TMDL is currently in the draft /public notice stages of the TMDL
approval process and the Minnehaha Creek chloride impairment is being addressed by the
Twin Cities Metropolitan Area Chloride Project.
2.2 NPDES Construction Stormwater General Permit
An NPDES Construction Stormwater General Permit is required for land disturbances from
construction activity of equal to or greater than one acre. Since the 54h Street reconstruction
project will disturb greater than one acre of land, the aforementioned permit and the
associated Stormwater Pollution Prevention Plan (SWPPP) will be required. Within the
SWPPP, project appropriate erosion prevention practices, sediment control practices,
inspections and maintenance, pollution prevention measures and final stabilization shall be
documented. The 54`" Street project will not exceed the threshold of replacing one or more
acres of pervious surfaces with impervious surfaces and therefore the permanent stormwater
management system requirements of the NPDES permit are not applicable.
2.3 MCWD Regulatory Rules
The Arden Park Area falls within the jurisdiction of the MCWD and projects are subject to
the MCWD permitting process and regulatory rules. Based on preliminary typical sections
presented in the Draft 54`h Street Roadway Reconstruction Feasibility Study, the project will
create approximately 5,000 square feet of net new impervious surface. Because the 54 h Street
project is a linear project creating less than 10,000 square feet of new impervious surface the
project is exempt from the Stormwater Management Rule. Other MCWD Rules such as the
Erosion Control Rule and the Waterbody Crossing & Structures Rule will still apply.
2.4 City of Edina Policies
One of the goals of the project is integrating elements of the City's Living Streets Policy and
sustainable infrastructure. The goals of the Living Streets Policy include safe walking,
bicycling and driving, reduced stormwater runoff, reduced energy consumption, and
promoting health. To assess the sustainable infrastructure elements staff are utilizing a
sustainability scoring system for this project called ENVISIONTM.The ENVISIONTM system
will help measure what effect project decisions and recommendations have on sustainability.
The rating system includes credits organized into five categories: quality of life, leadership,
resource allocation, natural world, and climate and risk. More details on the project's
ENVISIONTm evaluation are available in the Draft 54'h Street Roadway Reconstruction
Feasibility Study.
The City's Comprehensive Water Resources Management. Plan includes goals and policies
related to runoff management and flood control, water quality management, and wetland
protection. Specific policies and standards applicable to the 54`x' Street reconstruction project
include:
• New stormwater conveyance systems should be designed to convey flows from the 10-
year frequency, '/2 -hr storm.
• Peak flow rates limited in accordance with applicable MCWD rules
• Stormwater retention is required in accordance with applicable MCWD rules
• Stormwater retention/detention facilities must be designed according to the most current
technology as reflected in the MPCA publication Protecting Water Quality in Urban
Stormwater Management Plan EDINA 124747•
City of Edina, Minnesota Page 2
Areas, March 2000, the Minnesota Stormwater Manual (2008), or the applicable MCWD
rules, whichever are more restrictive. .
3.0 Analysis of Alternatives
3.1 Stakeholder Engagement Feedback
In June and July of 2013, more than 450 community members offered issues and needs for
both projects through an extensive stakeholder input process. Based on that input, the
consultant team developed a variety of design components to receive feedback at an August
19th workshop and through an online survey. Stormwater related design components
presented at the workshop included:
• Regional filtration basin — a large stormwater basin that does not contain permanent
standing water
• Underground retention — a series of larger pipes or chambers underground for storage and
slow release of runoff
• Porous paving — paving or bricks or a special mix of asphalt or concrete that has pores for
water to soak through
• Green roof — a roof that is partially or completely covered with vegetation and a growing
medium
• Cisterns /reuse — a system for collecting stormwater and storing it until it's needed for
other beneficial uses
• Snowmelt system — embedded electric cables or hydronic tubing under hardscapes that
melt snow or ice .
• SAFL baffle in sump manhole — a baffle to promote sediment and debris settling in a
manhole with storage below the outlet pipe
• Grass pavers — a product for grass reinforcement of trafficked areas like overflow grass
parking
• In -park filtration basin (turf) — a small grassed stormwater basin that does not contain
permanent standing water
• In -park filtration basin (native plants) — a small planted stormwater basin that does not
contain permanent standing water
• Catch basin inserts — device that traps trash, debris, sand, silts, and other contaminates in
runoff before entering the pipe system
• Tree trenches — trees planted in amended soils and rock to capture runoff and store /treat it
underground
• Rain gardens /grass swales — a planted depression or grassed swale that allows collected
stormwater to infiltrate
• Educational signage — signs to educate and encourage the public to recognize water
resource issues and solutions
• Buckthorn removal /reforestation — buckthorns are non - native shrubs or small trees that
crowd out native plants
Overall the stakeholders had a general understanding and were supportive of the goals for
stormwater management. However, a number of the design components in this category
garnered a range of both positive and negative feedback. The positive comments varied,
while most of the negative comments were about some of the large -scale components and
focused on cost, maintenance, size and location, and aesthetics. There was a lot of feedback
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 3
on filtration design components, with generally positive feelings about including native
plants. Stakeholders generally favored maintaining green space and existing park uses, and
ensuring that any new design components address water safety especially in play areas.
3.2 54th Street Reconstruction Opportunities
The existing geometry of the intersections at Park Place and Minnehaha Boulevard creates
large surface areas of pavement and intersection corners with long radius curb- lines. The
proposed project will reduce the curb radii at the intersections of Park Place and Minnehaha
Boulevard creating an area of green space in the boulevard extension ideal for rain gardens as
illustrated below.
The project will install new concrete curb and gutter and a trunk storm sewer pipe and inlet
system meeting State Aid minimum design standards to capture and convey stormwater.
Reconstructing the storm sewer as part of the street reconstruction project also provides
opportunities for enhancements such as a SAFL baffle in sump manholes which would be
ideally located in the last on -road manholes up gradient of the creek outfall to maximize the
area of stormwater treated.
3.2.1 Analysis and Results
Two rain gardens at the intersections at Park Place and Minnehaha Boulevard were modeled in P8 to
approximate load removals on an average annual basis. It is assumed that the rain gardens will be designed to
either receive direct surface runoff through curb cuts or as offline practices with storm sewer bypass once the
capacity of the rain garden is reached. It was also assumed that the rain gardens will function as an infiltration
practice without an underdrain (as opposed to a filtration practice with an underdrain). The following Table 1
list the inputs assumed for the P8 model.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 4
'
I
ANDBNC CURB
Ara currEa
� [NSDNG RIGHT-
a -war uuE
I � \ \ �
`�
EMSTING RIGHT
OF-WAY LINE
f
S
PROPOSED DUI4 DOSING CURB
HI D aIIER Ala Bul/eR� — ` W 54TH
ST
WALL
-
PROPOSED
%
A 5413
_.
CASTING W 54TH ST
NOW
_. .
PR OSED CURB AND
BOULEVARD
E%DA90N
`
PROPOSED
5.00
T \
T
BOULEVARD
E %TEN90N
The project will install new concrete curb and gutter and a trunk storm sewer pipe and inlet
system meeting State Aid minimum design standards to capture and convey stormwater.
Reconstructing the storm sewer as part of the street reconstruction project also provides
opportunities for enhancements such as a SAFL baffle in sump manholes which would be
ideally located in the last on -road manholes up gradient of the creek outfall to maximize the
area of stormwater treated.
3.2.1 Analysis and Results
Two rain gardens at the intersections at Park Place and Minnehaha Boulevard were modeled in P8 to
approximate load removals on an average annual basis. It is assumed that the rain gardens will be designed to
either receive direct surface runoff through curb cuts or as offline practices with storm sewer bypass once the
capacity of the rain garden is reached. It was also assumed that the rain gardens will function as an infiltration
practice without an underdrain (as opposed to a filtration practice with an underdrain). The following Table 1
list the inputs assumed for the P8 model.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 4
Table 1
P8 Model Input Parameters
Parameter
Park Place
Rain Garden
Minnehaha
Boulevard Rain
Garden
Hourly Precip File
Msp 989. c
Daily Air Temp. File
Msp 4889.tm
Particle File
Nurp50.p8p
Start Date
1/2/1949
Keep Date
1/2/1949
Stop Date
8/31/1989
Total Watershed Area (ac)
3.34
1.17
Pervious Area CN
58
58
Indirectly Connected Impervious
(fraction)
0.5
0.0
Directly Connected Impervious,
not swept (fraction)
0.15
0.5
Device Type
INF BASIN
INF BASIN
Bottom area (ac)
0.000
0.001
Storage pool area (ac)
0.009
0.012
Storage pool volume (ac -ft)
0.008
0.012
Infiltration Rate (in/hr)
0.8
0.8
Void Volume ( %)
100
100
Note: Default P8 parameters were used if not indicated
The total suspended solids (TSS) and total phosphorus (TP) annual load summary is presented in Table 2
below. In addition to providing water quality benefits, the practices also provide a combined runoff volume
abstraction benefit on the order of 850 cubic feet (equivalent to one inch of volume control for approximately
10,000 square feet of impervious surface).
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 5
Table 2
P8 Model Results Summary
To estimate the potential TSS load removals provided by a SAFL baffle or similar enhanced
water quality structures, a SHSAM model (modeling software provided by Barr Engineering
Co.) was utilized. The key weather inputs for SHSAM were 15- minute rainfall data from
Golden Valley, MN and daily temperature data for the years of 1995 -2007. The MNDOT-
Road Sand Particle Size Distribution was assumed at a default concentration of 200 mg/I for
the water entering the structures during model simulations. The key watershed properties
input into SHSAM are shown below in Table 3. The model simulations were run assuming a
4 ft diameter manhole with a sump depth of 4 ft and a 15" pipe flowing into the SAFL Baffle.
The average yearly load removed and removal efficiency from 1995 -2007 for proposed
structure #104 was 790 lbs of TSS /yr and 31.2 %, respectively. The average yearly load
removed and removal efficiency from 1995 -2007 for proposed structure #204 was 949 lbs of
TSS /yr and 71.2 %, respectively.
Table 3
SHSAM Watershed Input Properties
Water Quality
Structure No.
Park Place Rain
Minnehaha
Hydraulic
Length ft
Parameter
Garden
Boulevard Rain
Total
30
640
Garden
70
TSS Total Inflow
3.15
30
950
(lbs/ r)
637
398
1035
TSS Surface Outflow
(lbs/ r)
338
84
422
TSS Removed
(lbs/ r)
299
314
613
TP Total Inflow
(lbs/ r)
2.0
1.3
3.3
TP Surface Outflow
(lbs/ r)
1.4
0.5
1.8
TP Removed
(lbs /yr)
0.6
0.8
1.4
To estimate the potential TSS load removals provided by a SAFL baffle or similar enhanced
water quality structures, a SHSAM model (modeling software provided by Barr Engineering
Co.) was utilized. The key weather inputs for SHSAM were 15- minute rainfall data from
Golden Valley, MN and daily temperature data for the years of 1995 -2007. The MNDOT-
Road Sand Particle Size Distribution was assumed at a default concentration of 200 mg/I for
the water entering the structures during model simulations. The key watershed properties
input into SHSAM are shown below in Table 3. The model simulations were run assuming a
4 ft diameter manhole with a sump depth of 4 ft and a 15" pipe flowing into the SAFL Baffle.
The average yearly load removed and removal efficiency from 1995 -2007 for proposed
structure #104 was 790 lbs of TSS /yr and 31.2 %, respectively. The average yearly load
removed and removal efficiency from 1995 -2007 for proposed structure #204 was 949 lbs of
TSS /yr and 71.2 %, respectively.
Table 3
SHSAM Watershed Input Properties
Water Quality
Structure No.
Drainage
Area ac
Impervious
%
Hydraulic
Length ft
Average
Sloe %
Pervious CN
104
6.06
30
640
4.7
70
204
3.15
30
950
3.2
70
3.3 Arden Park BMP Opportunities
Within Arden Park itself, a couple of key messages were heard during the input process: the
need to maintain the current active use areas; the need to maintain safety in and around water
areas and the desire to have systems that fit the natural look of the park. Because several of
the larger trunk storm lines enter the creek within the limits of the park, the park areas present
an excellent opportunity to remove pollutants from storm water runoff prior to discharging to
the creek. Opportunities include a combination of infiltration/bioretention practices at
selected locations to treat street runoff or storm pipe discharges.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 6
Arden Park BMP opportunities are displayed in Figure 1. Locations shown on the map are
intended to identify general locations. This preliminary plan is not intended to provide
detailed designs for these areas that include the size, shape and planting materials. That said,
input was very clear that there is a great need to maintain the active park area. To accomplish
this, the recommendations of this plan are to create smaller, linear, or underground practices
that provide treatment and fit the aesthetics of the park, but that take up little or no active park
area.
One concept that should be explored further as future phases of stormwater improvements
progress is more intense grading in the park that would raise the active park areas that are
currently unusable at times due to wet soil conditions. At the same time, the outer edges of
the park would be lowered to provide rain garden or shallow swales for treatment and
conveyance of the stormwater around the active areas instead of directly through them. The
photos below show an example of a similar project completed in a park in Maplewood. That
project was developed through an extensive public input and park planning effort and has
been a huge success and improvement for the local residents.
3.3.1 Analysis and Results
The five BMP opportunities within Arden Park identified in Figure 1 were analyzed at a
planning level scale using the MIDS calculator. It was assumed that the soils were silty sand
(HSG B) and the drainage catchments were residential land use with roughly 40% impervious
area and 60% managed turf. Approximate pollutant removal estimates for each BMP are
summarized in Table 4.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 7
Table 4
Arden Park BMP Summary
3.3.2 Creek Grade Control Structure
MCWD has investigated the removal of the grade control structure in Minnehaha Creek near
the 54`h Street crossing. The existing structure creates unique whitewater kayaking
opportunities for experienced users during high flow conditions; however, many stakeholders
have expressed concern that the rapids conditions are unsafe for a majority of lesser
experienced users. In addition, the structure has also been identified as a barrier to fish
passage and inhibits aquatic habitat upstream. Conceptual design alternatives for improving
fish passage and ecological integrity while maintaining the recreational functionality for
kayakers have been evaluated and are discussed in more detail in the Minnehaha Creek 54`h
Street Barrier Removal technical memorandum dated November 22, 2013.
3.4 Area -Wide BMP Opportunities
The overall study area for this stormwater system review and analysis includes the area
bounded roughly by France Avenue to the east, West 54`h Street to the south, Wooddale
Avenue to the west and 50`" Street to the north. The commercial /retail area along France
Avenue and north of 50`h is included in the study area as it contributes storm water runoff to
the creek in the northern portions of Arden Park.
One of the primary goals for expanding the study area beyond the immediate project limits of
the West 54`h Street project was to look for opportunities to better manage and treat
stormwater that currently discharges to the creek directly with little to no treatment. A second
factor was to identify opportunities to address any local street flooding in the residential areas
and improve the nuisance drainage conditions in Arden Park.
Several potential improvement opportunities exist within the current drainage system and are
identified in Figure 2. While additional options were discussed during the stakeholder input
process, those shown in Figure 2 are the ones that had the most support and/or are located
where they can be most effective at achieving the City and Watershed District goals for
improved water quality.
I':)
Stormwater Management Plan
City of Edina, Minnesota
EDINA 124747
Page 8
Drainage
Volume
Annual TP
Annual TSS
Area
Capacity
Reduction
Reduction
BMP ID
ac
(ft)
Ibs
Ibs
Bioretention
Basin 1
5.94
3420
3.20
580
Bioretention
Basin 2
17.46
7170
8.80
1599
Bioretention
Basin 3
5.71
5130
4.18
759
Underground
Infiltration
83.99
17584
29.91
5435
Grassed
Swale
7.00
4287
5.01
1050
3.3.2 Creek Grade Control Structure
MCWD has investigated the removal of the grade control structure in Minnehaha Creek near
the 54`h Street crossing. The existing structure creates unique whitewater kayaking
opportunities for experienced users during high flow conditions; however, many stakeholders
have expressed concern that the rapids conditions are unsafe for a majority of lesser
experienced users. In addition, the structure has also been identified as a barrier to fish
passage and inhibits aquatic habitat upstream. Conceptual design alternatives for improving
fish passage and ecological integrity while maintaining the recreational functionality for
kayakers have been evaluated and are discussed in more detail in the Minnehaha Creek 54`h
Street Barrier Removal technical memorandum dated November 22, 2013.
3.4 Area -Wide BMP Opportunities
The overall study area for this stormwater system review and analysis includes the area
bounded roughly by France Avenue to the east, West 54`h Street to the south, Wooddale
Avenue to the west and 50`" Street to the north. The commercial /retail area along France
Avenue and north of 50`h is included in the study area as it contributes storm water runoff to
the creek in the northern portions of Arden Park.
One of the primary goals for expanding the study area beyond the immediate project limits of
the West 54`h Street project was to look for opportunities to better manage and treat
stormwater that currently discharges to the creek directly with little to no treatment. A second
factor was to identify opportunities to address any local street flooding in the residential areas
and improve the nuisance drainage conditions in Arden Park.
Several potential improvement opportunities exist within the current drainage system and are
identified in Figure 2. While additional options were discussed during the stakeholder input
process, those shown in Figure 2 are the ones that had the most support and/or are located
where they can be most effective at achieving the City and Watershed District goals for
improved water quality.
I':)
Stormwater Management Plan
City of Edina, Minnesota
EDINA 124747
Page 8
Opportunities range from trash/debris removal practices such as retrofitting existing
manholes with sumps and SAFL Baffles to raingardens and streambank stabilization.
Identified in Figure 2 for area -wide improvements are:
• Ideal SAFL Baffle locations in the last on -road manholes up gradient of the creek outfall
• Residential parcels with suitable site conditions on the low point of city blocks as priority
locations of raingardens, and
• Private parcels adjacent to Minnehaha Creek as candidates for streambank stabilization
projects.
In addition, the study has identified some practices that can be incorporated into the 50'h and
France business area and neighborhood churches as redevelopment projects occur. Figure 2
identifies a few of the options discussed with business owners during the stakeholder process.
3.5 Non - Structural Improvements
Buckthorn removal throughout the park and neighborhood received unanimous and positive
support through the stakeholder engagement feedback. There are significant opportunities
within the park and on private parcels adjacent to the creek to remove buckthorn and restore
native plant communities. Although it's difficult to numerically quantify the benefits of
native plants, when used as a buffer between turf and the creek provide water quality benefits
by preventing erosion, filtering polluted runoff, and discouraging geese which can contribute
to elevated fecal coliforn bacteria in the creek.
The 50''' and France Business Association stakeholders showed a strong interest in the
potential to utilize alternative deicing agents on the sidewalks and pavement which could
both lessen the chloride concentration of runoff and diminish corrosion of embedded metals
in concrete and thereby lengthening the life span of parking structures.
4.0 Recommendations and Conclusions
The implementation of the improvements discussed within this report can categorized on
three distinct levels:
• Level 1: 54''' Street Reconstruction Stormwater Improvements
• Level 2: Watershed Source Control/Non- structural Improvements
• Level 3: End -of -Pipe /Regional Treatment
A summary of the estimated benefit and cost per benefit for each of the improvements by
category is provided in Table 5.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 9
Table 5
Improvement Cost - Benefit Summary
BMP
Volume
Annual TSS
Annual TP
Cost
$ /Ib TSS
$ /Ib TP
Capacity
Removal
Removal
Estimate
(ft)
(Ibs)
(Ibs
Level 1` 54th Street Reconstruction Stormwater Improvements
SAFL Baffle
MH -104
NA
790
NA'
$4,500
$6
NA'
SAFL Baffle
MH -204
NA
949
NA'
$4,500
$5
NA'
Park Place Rain
Garden
350
299
0.6
$5,618
$19
$9,363
Minnehaha Blvd
Rain Garden
522
1 314
0.8
$8,378
$27
$10,473
Level 2: Watershed Source Control /Non- structural Improvments
Residential Rain
Garden
Streambank
Stabilization
TBD - Based on property owner participation, drainage area to treatment area ratio,
and other factors not readily available or quantifiable
Native Restoration
Alternative
Deicing Agents
Impervious Area
Reduction
Level 3: End -of -Pipe /Regional Treatment
Bioretntion
Basin 1
3420
580
3.2
$54,891
$95
$17,153
Bioretntion
Basin 2
7170
1599
8.8
$115,079
$72
$13,077
Bioretntion
Basin 3
5130
759
4.2
$82,337
$108
$19,604
Grassed
Swale
4287
1050
5.0
$348,322
$332
$69,664
Undergound
Infiltration 1
17584
1 5435
1 29.9
$4,0079569
$737
$134,032
'Although these structures do not target phosphorus removal, they can remove phosphorus indirectly
by settling out phosphorus that adheres to sediments.
BBased on average construction cost per water quality volume found in Table 1 of Best Management
Practices Construction Cost, Maintenance Costs, and Land Requirements (Barr Engineering, 2011)
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 10
Although the City does need not do any permanent stormwater management for the 541'
Street project based on WD standards, clean water credits can efficiently be generated for
TMDL goals within the project construction area with the cost effective Level 1
improvements.
For Level 2 improvement opportunities, the City may also choose to collaborate with MCWD
on providing outreach and opportunities for homeowner raingardens and streambank
stabilization projects in the priority areas identified. The City should also further explore the
potential in the strongly supported non - structural BMP options identified on City managed
property and right -of -way. Although the cost - benefit has not been quantified for this level of
implementation, it is usually more cost - effective to prevent pollution than to treat it after it
has entered stormwater conveyance systems or waterbodies.
Implementation of the Level 3 regional stormwater BMP improvements may be delivered by
a couple of different approaches. First, the City may choose to implement improvements as
part of a park improvement project, stand alone local stormwater improvement or through a
cooperative project with the watershed district. Second, as redevelopment projects occur in
the 50th- France business area and neighborhood churches, these project owners will need to
develop stormwater practices that meet the requirements of the City, watershed and NPDES
Permit. When onsite improvement options are limited for private redevelopment, one
approach they may follow is to look at the off -site options shown in Figure 1 and work with
the City and watershed to implement these projects as a complete or partial credit towards
meeting their site specific stormwater management needs.
Stormwater Management Plan EDINA 124747
City of Edina, Minnesota Page 11
List of Figures
Figure 1 —Arden Park BMP Opportunities
Figure 2 — Area -Wide BMP Opportunities
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Arden Park BMP Opportunities
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2 S E H
Edina, Minnesota
DATE: April I, 2014
TO: Mayor and City Council
CC: Brian Olson P.E., Chad Millner P.E.
FROM: Ross Bintner P.E. - Environmental Engineer M
RE: Water, Sanitary, and Stormwater System Planning
This memo describes domestic water, sanitary sewer, and storm sewer systems, system resilience and capacity
for future growth in the Grandview district and southeast Edina.
Executive Summary
This memo provides a summary of water, sanitary and stormwater utility services, and reflects the state of the
practice in managing city utilities to sustain the existing service and react to growth in service demand. Key
infrastructure and information needs, project recommendations, and process improvement opportunities are
called out.
Water, sanitary and stormwater public utilities provide critical public health and public safety service. These
services are primarily provided by pumps, pipes and electronic control systems, and are increasingly dependent
on and constrained by energy and natural water resources systems. The infrastructure providing these utility
services are aging. While continual repair and renewal of this infrastructure is taking place, it is sometimes
reactionary. Service level is sometimes undefined, and performance metrics do not reflect customer service.
Non - project recommendations drive toward integrated project scope decisions and better asset management
process.
Growth in service demand in southeast Edina and the Grandview are expected, and our initial review show
need for increased water treatment and trunk sanitary capacity in southeast Edina in the next decade. Schedule
for trunk sewer capacity additions in the Pentagon Park neighborhood are heavily dependent on Met Council
action. This initial capacity review also revealed an immediate need for demand reduction or additional sanitary
capacity in the Hwy 100 / Cahill industrial area, limited capacity in the 65th / Xerxes trunk line, and good
sanitary capacity for future growth in the Grandview district.
Background
Development that initially drove construction of Edina's infrastructure proceeded from the northeast to the
southwest. This phased development is shown in Figure I — Residential Periods of Construction and Figure 2 —
Age of Buildings. A portion of northeast Edina was constructed in the 1940s and earlier. The majority of
infrastructure in the City of Edina was constructed in the 1950s and 1960s. Minor infill development occurred
in the 1970s and 1980s.
With the bulk of its infrastructure in the 1950s and 1960s cohorts, the City has begun reconstructing significant
portions of its streets and portions of its pipe infrastructure to maintain service reliability as the systems age.
Figure 3 — Local Bituminous Street Reconstruction History shows areas of street reconstruction over the past
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www.EdinaMN.gov . 952 -826 -0371 9 Fax 952- 826 -0392
17 years. Figure 4 — Anticipated Local Bituminous Street Reconstruction shows potential areas of
reconstruction over the next five years.
The City of Edina operates a public utility providing water, sanitary and stormwater services. These utility
services provide:
1) Clean and reliable drinking water to:
a. - promote public health, and
b. waters to suppress fire for public safety.
2) The collection, treatment and disposal of sanitary sewer waste to:
a. prevent disease, and
b. promote public health.
3) Management of flood waters and floodplain to:
a. promote public safety, and
b. protect property.
4) Management of stormwater runoff to:
a. prevent pollution,
b. promote the public health, and
c. improve the health of local water bodies and the environmental services they provide.
Summary of Infrastructure
The water, sanitary, and stormwater public utility services are provided using extensive physical infrastructure
and modest programmatic efforts. Each utility is planned, operated, maintained, expanded, replaced, and
managed by professional staff in the City's Public Works and Engineering departments. Engineers and system
operators use a process called "asset management" to set service levels, assess the present condition of the
infrastructure, judge system performance, plan for future upgrades, and assess risks.
The tools, methods and processes used to manage aging infrastructure are becoming increasingly data intensive.
Also increasing management complexities are the better scientific understanding of both the chemical, physical
and biological processes acting on the systems and the infrastructure's interaction with the natural systems on
which each utility service depend. Changing methods of construction including trenchless installation and
robotic pipe rehabilitation technology also have changed project scope choices, and continue to lower overall
cost of repair.
The following is a brief description of each of the utilities in the City of Edina including:
1) Description of service: An overview of the service(s) provided, system extents and critical design
considerations.
2) Infrastructure summary: A description of major components of the system, scale of system and current
estimated replacement value (not including potential restoration costs such as pavement or sod.)
3) System understanding: List of the most recent plans, review of the key design variables, reliability and
risks.
4) Function and condition assessment: Review of methods to assess system and overview of issues with
age and existing materials.
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www.EdinaMN.gov . 952- 826 -0371 . Fax 952- 826 -0392
Water
1) Water production and distribution infrastructure is built to provide uninterrupted service of clean
drinking water citywide, and is made available in abundance for firefighting. Water is supplied from
groundwater aquifers through wells spread throughout the community and distributed via a network of
pipe. Some wells are connected to water filtration plants and are used to provide water in normal use
periods. The remaining wells are unfiltered and rotate into service during peak use periods. A small
portion of the City is served by Eden Prairie, Bloomington, Saint Louis Park or Minneapolis water supply.
2) The domestic water system is made up of two parts. The first is a water distribution system that
includes: 220 miles of pressure water main ranging from 4 -16" in diameter, nearly 5000 main valves, 2000
hydrants, and 13500 service connections, valves and meters. The second is a water production and
treatment system that includes: 18 wells, 4 treatment plants, 4 water towers, and I reservoir. The
estimated 2013 total replacement value of this infrastructure is over $140 million.
3) The current system understanding is based on the 2002 Water Distribution System Analysis by SEH and
the 2013 Wellhead Protection Plan by Source Water Solutions. The City also has a current InfoWater
model that describes the distribution system, and regional agencies maintain a variety of regional
groundwater models used to understand and assess groundwater risk and supply. Modeling projects that
enhanced the system understanding include a 2013 Water System Demand and Capacity Analysis for Water
Treatment Plan 5 (WTP5). The water distribution system is sized based on geometric constraints, system
wide supply and demand, design pressure, and fire flow capacity. Supply systems include reliable power
backup, to keep the distribution system under constant pressure to meet supply and keep contaminants
out. The production system is designed to meet peak day and peak week demands, assuming the largest
well in the system is out of service.
4) The current method of condition assessment is through maintenance records, continuity comparison
between pumped and metered flow, and visual inspection of the main during water main repair work. The
water system is remotely controlled by a data collection and control (SCADA) system, and this system also
provides insight into system function. System age affects service reliability as spot repairs are made due to
water main and service breaks. Figure 5 — Watermain and Service Breaks shows recent repair density
across the city. Cast iron pipe material type is considered in higher need for replacement or rehabilitation.
Figure 6 — Water Pipe Material Distribution shows material type distribution citywide. Some areas of
northeast Edina have had full pipe replacement with new high - ,density polyethylene (HDPE). Additional
looped connection pipes are considered to raise service levels in areas with low pressure or stagnant water
complaints.
Sanitary
1) Sanitary collection system infrastructure is built to transmit peak flows without surcharge and reduce
risk of human exposure. Wastewater is collected and routed via private service connections to lateral and
trunk sanitary pipes and then on to the regionally operated Met Council system. There it is conveyed to
either St. Paul Pig's Eye or Eagan Seneca treatment plants for treatment and disposal of waste. The system
functions via gravity flow, with intermittent pump lift stations and sanitary force main when needed.
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www EdinaMN.gov . 952- 826 -0371. Fax 952 -826 -0392
2) The sanitary system is made up of three parts. The first includes privately owned service pipes. The
second is a City-owned collection system that includes: 195 miles of gravity main ranging from 4 -33" in
diameter, over 5000 maintenance access manholes, 5 miles of force main, and 23 lift stations. The third is a
regional trunk conveyance and treatment system owned and operated by the Met Council, to which the
City pays fees based on use. The estimated 2013 total replacement value of the City portion of
infrastructure is $70 million. System costs for the Met Council systems are prorated metro area wide by
metered flow volume.
3) The current system understanding is based on a 2006 XP -SWMM model by Barr and a 1997 Sanitary
System Evaluation by TKDA. The collection system was designed based on expected total and daily peak
flow, estimated based on land use, density, average population per household, average per capita water use,
and an allowance for inflow and infiltration during storm events. Modeling and meter calibrated flows were
conducted in 2006 to predict system capacity. Reducing inflow of floodwaters through manholes, basement
foundations, parking garages, and other structure flooding can increase reliability and reduce costs.
Reducing infiltration of stormwater though pipe and service lining can reduce treatment costs.
4) The current method of condition assessment is through closed circuit televising of lines, maintenance
records, and visual inspection of manholes. Sanitary lift stations are remotely controlled by a SCADA
system, and this system also provides insight into system function. Lining of clay pipe (VCP) is considered a
high priority to increase reliability and reduce infiltration. Figure 7 — Sanitary Pipe Material Distribution
shows the majority of the system as VCP, with three of the four major trunk lines primarily made of
reinforced concrete (RCP). Locations of cast in place (CIPP) liner, and PVC and HDPE show the extend of
pipe rehabilitation work.
Stormwater
1) Storm sewer conveyance system infrastructure is built to carry the water from a storm with a 10%
chance of occurring in a given year for neighborhood and lateral systems, and water from a storm with a
I % chance of occurring in a given year for trunk and regional systems. Floodplain is managed to minimize
damage and maintain flood storage and conveyance capacity. Stormwater treatment infrastructure is built
to meet regulation defined pollutant removal targets, and is complemented by programmatic pollution
prevention techniques and system maintenance such as street sweeping, stormwater education, illicit
discharge enforcement and sediment trap manhole cleaning.
2) The stormwater system includes over 127 miles of gravity main ranging from 12 -84" in diameter, 6200
manholes, 900 outlets, 24 miles of sump drain, I I stormwater lift stations, one -half mile of stormwater
force main, 150 ponds and wetlands, and numerous sediment trap structures. The estimated 2013 total
replacement value of this infrastructure is $60 million.
3) The current system understanding is based on the 2011 Comprehensive Water Resources Management
Plan by Barr. The collection system is designed to provide drainage and manage flood risk. Recent upward
revisions to storm frequency probability (NOAA Atlas 14) mean portions of the system previously meeting
design standards are now considered under sized, and flood storage areas now have higher peak flood
elevations. Treatment systems are designed to meet pollutant removal standards set by the State and
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www.EdinaMN.gov . 952- 826 -0371 9 Fax 952- 826 -0392
Watershed Districts. Clean water service demand due to water body specific Total Maximum Daily Load
(TMDL) regulation is increasing. There is no reliable estimate for future liability.
4) The current method of condition assessment is through visual inspection of storm manholes and outlets
and some closed circuit televising of lines where needed. System function is checked with a calibrated
computer model and though visual inspection after large storm events. Pollution removal is estimated with
an uncalibrated computer model.
Comprehensive Plan and Service Demand Trend
Some areas of the City are being considered for future redevelopment. These areas include the Grandview
Area, Southeast Edina, and 50' and France. In anticipation of this redevelopment, staff completed various
infrastructure system studies for those areas. These studies allow staff to plan future improvements in
anticipation of the system needs identified in these specific areas. In addition to those system studies
referenced above, the conclusions in this memo and project recommendations are informed by the following
studies, and will be further refined during the development of the 2015 -2019 CIP.
Water
1. Hydraulic Modeling Results - Water Treatment Plant #6 and Southdale Development (July 3, July 13
2012 SEH Engineering)
2. Water System Demand and Capacity Analysis — Water Treatment Plan #5. (October 23, 2013 SEH
Engineering)
3. Grandview Area Water Distribution System Analysis (February 21, 2014 SEH Engineering)
4. TH 62 and Concord Water Main Break Analysis (March 10, 2014 SEH Engineering)
Sanitary
I . FilmTec Flow Analysis (April 5, 2013 Barr Engineering)
2. Sanitary Sewer Model Recalibration (November 22, 2013 Barr Engineering)
3. Southeast Edina SAC Availability Analysis (July 23, 2013 Barr Engineering)
4. Edina SAC Availability Analysis — Fairview Southdale (July 23, 2013 Barr Engineering)
5. Trunk Sanitary Sewer Infiltration Study (December 5, 2013 Bolton and Menk)
6. Grandview Area Sanitary Sewer Analysis (February 21, 2014 Barr Engineering)
7. WTP #4 Sewer Analysis (forthcoming 2014 Barr Engineering)
The Edina Comprehensive Plan was updated in 2008. In acknowledgement of the continued pressure to
redevelop to mixed uses around existing commercial and office districts and the increase in development
density envisioned in Chapter 4, Chapter 8 describes broad trends in system capacity and the ability of the
existing infrastructure to meet future service demand.
Two development scenarios were reviewed for sanitary and water capacity during the development of the plan;
Scenario I included Met Council estimates for growth in population and employment and Scenario 2 describes
an ultimate possible development density. The Met Council estimate in Scenario I assumed a change from
48,500 residents and 52,100 jobs in 2010 to 50,000 residents and 57,400 jobs in 2030. The ultimate
development density assumed in Scenario 2 was 70,149 residents and 70,000 jobs. Both scenarios assume the
bulk of growth will occur in the southeast quadrant of the City in existing commercial areas. The new 2030
population and job projections due out this year appear to be falling on the mid to low side of the range of
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www.EdinaMN.gov 9 952- 826 -0371 9 Fax 952- 826 -0392
these two scenarios. The following is a more detailed review of each utility, with a focus on growing areas in
southeast Edina:
Water
Comprehensive Plan Chapter 8 describes trends and challenges to the public water supply. Generally, the
City has a resilient water system that can produce clean, safe and plentiful water for public use. The
increasing occurrence of groundwater quality issues and contamination (vinyl chloride and radium) has led
to increased treatment needs. Providing water for the peak demand is also a concern. The demand for
water increases in the evenings due to in -home use and in the summer due to irrigation systems. The
average daily demand in Edina is between 7 and 8 million gallons per day (mgd). The peak demand is
between 14.5 and 22 mgd, which is about three times higher than the average daily demand. This is known
as the peaking factor, and Edina (with a peaking factor of 3.0) is in the high end of the range that is typical
for similar suburban communities.
Under Scenario I, two additional wells and no additional water storage would be needed assuming no
decrease in the peaking factor, or one additional well with a reduction in the peaking factor resulting from
conservation efforts. Under Scenario 2, even with aggressive conservation efforts and a corresponding
reduction in the peaking factor from 3.0 to 2.75, an additional 7 wells or equivalent supplementary sources
will be needed. No major upgrades to the distribution system are required for either scenario assuming
aquifer capacity is available and water supply is sources by local wells. Upgrades to the distribution system
may be required under Scenario 2 if water purchase agreements with nearby communities were pursued.
Additional filtration capacity is desirable under both scenarios.
Sanitary
System flow in the water and sanitary systems are closely linked. In general, declining trends in system flow
were noted in the sanitary sewer between 1980 and 2000, with a flat trend between 2000 and 2010.
Reasons for decreased demand include changing demographics (fewer people per household) and increasing
retrofit of buildings to include efficient modern fixtures and appliances. Reasons for increasing demand on
system use include redevelopment and leaky aging pipes. The Met Council expects to see continued
pressure for redevelopment along the 494 corridor, and has improved regional trunk sewer conveyance
capacity as a result. This additional capacity is extended to the City boundary at Xerxes and 75h and can
be extended into the southeast quadrant of the City with additional trunk infrastructure investment.
Both the 2006 XP -SWMM analysis and 2008 Comprehensive Plan concluded that Scenario I could be
accommodated without major trunk line upgrades but Scenario 2 would require major system upgrades,
dependent on redevelopment density and pattern. In 2013, the Engineering Department directed Barr
Engineering to review the sanitary sewer model for flow capacity constraints in southeast Edina. Figure 8 —
BARR South East Edina Sanitary Sewer Capacity (Barr Figure 1) shows and overview of the system flow
capacity available in the sanitary conveyance system in the project area. In general Southeast Edina is well
served in the near term with some excess capacity available for growth. The review shows most lateral
lines have excess capacity, and trunk lines are running nearer to design capacity. The review also shows a
trunk line serving western Edina and the Hwy 100 / Cahill industrial area running at capacity. The portion
of southeast Edina that serves the hospital and flows to MCES RF -490 (65th/Xerxes trunk) has limited
remaining capacity.
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, MInnesota 55439
w%vw EdinaMN.gov . 952 - 826 -0371 • Fax 952- 826 -0392
Stormwater
Storm system flows are linked to hydrologic, geologic and geometric attributes such as the connectivity in a
drainage area, the percent of a site that is impervious, condition of the soil, and vegetation. In general, the
service demands for clean water and flood protection are growing based on increased understanding of
natural systems and regulation by state and local watersheds to remediate and protect local waters. While
Nine Mile Creek capacity in southeast Edina show some flooding risk, infrastructure used to provide local
flood protections is generally robust, and soil conditions in much of the area are favorable to reducing
runoff. There is an increasing pressure on flow due to redevelopment at higher densities, but local controls
require much of the flow and water quality treatments to happen on -site for large lot and commercial
development. This trend will lead to less utilization of city infrastructure for small storm events, and a
continued reliance for large storm events. Residential redevelopment runs counter to this trend because
treatment and control is not required for lots less than one acre in size.
Additional demand analysis was conducted for the Grandview area, and aside from minor sanitary lift station
and looped water recommendations, the area is well served to meet future demand. Demand analysis for the
Gateway /Pentagon park area was studied in detail in the June 2013 Update to the September 26, 2007
Alternative Urban Areawide Review (AUAR) by WSB Engineering. Demand growth in this area will require the
improvement of flow capacity at a Met Council lift station, and additional local sanitary capacity in Edina and
Bloominton.
Opportunities
As the Engineering Department completed this review, we looked for opportunities to improve project
efficiencies and decision- making. Priority areas include project scope decisions and the neighborhood street
reconstruction program and asset management process. Non - project recommendations contained in this
memo, and the upcoming 2015 -2019 CIP will address these two priority areas.
Neighborhood Street Reconstruction Program
The City's neighborhood street reconstruction program provides a cost effective project delivery method to
bundle a variety of system improvements. This concept should be expanded to increasingly combine street and
infrastructure decisions, and major maintenance and capacity increase decisions. Bundling of street and utility
system improvements, and capacity increase and system maintenance improvements reduces fixed expenses
such as project bid, contractor mobilization and restoration. This type of integrated project scope decision
requires more work up front, and high quality data linking system needs and service.
Asset Management
The tools, methods and processes used to manage aging infrastructure are becoming increasingly data intensive.
Engineering and Public Works share geographical information system (GIS) records, and collaborate on the
development of the Cityworks service request, work order and asset management system (AMS) software.
Development and staff training supporting these software tools enable increasingly efficient records
management, workflow tracking and process improvement, and trend and system analysis. The current rate of
growth of these information systems limit our ability to enable increasingly complex street reconstruction
decision making, track reliability trends, and provide annual reporting on outages, repair costs, and
performance metrics.
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www.EdinaMN.gov 9 952- 826 -0371 • Fax 952- 826 -0392
Conclusions and Recommendations
Water, sanitary and stormwater public utilities provide critical public health, sanitation and public safety
services. These services rely on aging infrastructure systems, the operations, maintenance, engineering and
design of which support their continual function. This memo provides a summary of the physical infrastructure
and reflects the state of the practice in managing city utilities to sustain the existing service and react to growth
in service demand. Key infrastructure and information needs, project recommendations, and process
improvement opportunities are described above and are summarized in the following recommendations:
Decision - making and personnel
2014 GIS /IS study
2015 Sanitary and storm sewer service definition and performance metrics
2016 Domestic water service definition and performance metrics
Studies and preliminary engineering
2015 Trunk sewer televising (project areas 8, 9, 12, 13, 14)
2015 Sanitary capacity summary
201572 nd Street trunk sanitary capacity alternatives
2016 Southeast Edina trunk sanitary capacity alternatives
2016 Water Treatment Plant 5, storage and well 21 scoping
2017 Gateway area sanitary capacity
Infrastructure
2015 Arden Park trunk sewer lining (project area 3 and 4)
2016 Minnehaha trunk sewer lining (project area 5)
2017 Northwest area sanitary rehabilitation
2018 Well 21 and raw water
2018 -2019 Water Treatment Plant 5 and storage
2019 Southeast Edina trunk sanitary capacity
Appendix
Figure 1: Residential Periods of Construction
Figure 2: Age of Buildings
Figure 3: Reconstruction Program History
Figure 4: Anticipated Local Bituminous Street Reconstruction
Figure 5: Watermain and Service Breaks
Figure 6: Water Pipe Material Distribution
Figure 7: Sanitary Pipe Material Distribution
Figure 8: South East Edina Sanitary Sewer Capacity (Barr Figure 1)
GAIRVV\INFRASWTILITIES DIV\SANITARY SEWER\Modeling and Studies \140401 Infrastructure Capacity Memo.docx
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www.EdinaMN.gov . 952- 826 -0371 • Fax 952- 826 -0392
Figure I: Residential Periods of Construction
Engineering Department, June 2006
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
wwwEdinaMN.gov.952- 826 -0371 • Fax 952-826-0392
Residential Periods of onstruction
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Figure 2: Age of Buildings
Engineering Department, July 2013
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www EdinaMN.gov9 952 -826 -0371 • Fax 952- 826 -0392
ILI
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.
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Figure 3: Local Bituminous Street Reconstruction History
Engineering Department, November 2013
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www EdinaMN.gov . 952- 826 -0371 • Fax 952- 826 -0392
City of Edina
. Local Bituminous Street Reconstruction History
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2012
2013
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Figure 4: Anticipated Local Bituminous Street Reconstruction
Engineering Department, November 2013
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www.EdinaMN.gov . 952- 826 -0371 a Faz 952- 826 -0392
w
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Note /Disclaimer
The dates shown on the map represent the anticipated years of construction and are subject to change based on budgetary issues, adjacent projects, resident input and other factors.
Not all bituminous roadways within the City are shown. If a road is not highlighted then the potential reconstruction date is beyond the City's long term planning process.
The City of Edina's street improvement policy is to assess residents for a portion of the roadway reconstruction costs. Public utility improvements are paid for from the City's utility fund.
Extensive evaluation regarding the condition of the bituminous pavement, sanitary sewer, storm sewer and water main were used to set the priority of roadway improvements.
This map only addresses local bituminous streets and does not address State -Aid routes or concrete streets within the City.
Figure 5: Watermain and Service Breaks
Engineering Department, February 2014
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina. Minnesota 55439
www.EdinaMN.gov . 952 -826 -0371 • Fax 952 -826 -0392
�,�A k
O e 7.
�� Watermain Breaks and Service Leaks
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Engineering Dept
February 2014
Figure 6: Water Pipe Material Distribution
Engineering Department, July 2013
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www.EdinaMN.gov . 952- 826 -0371 . Fax 952- 826 -0392
=-OR
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Figure 7: Sanitary Pipe Material Distribution
Engineering Department, July 2013
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
.www.EdinaMN.gov . 952- 826 -0371 . Fax 952- 826 -0392
Figure 8: South East Edina Sanitary Sewer Capacity (Barr Figure 1)
Barr Engineering, June 2013
ENGINEERING DEPARTMENT
7450 Metro Boulevard • Edina, Minnesota 55439
www EdinaMN.gov. 952- 826 -0371 • Fax 952 -826 -0392
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Meters SANITARY SEWER CAPACITY
0 250 500 750 SE Edina SAC Availability Study
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Feet Figure 1
0 600 1,200 1,800
SOUTH EAST EDINA
Meters SANITARY SEWER CAPACITY
0 250 500 750 SE Edina SAC Availability Study
City of Edina, MN
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