HomeMy WebLinkAbout10.C.1. Emerald Ash Borer Management Options General Business 10. C. 1.
SHAKOPEE
TO: Mayor and City Council
FROM: Jacob Busiahn, Natural Resources Technician
DATE: 04/21/2015
SUBJECT: Emerald Ash Borer Management Options
Action Sought
Approve a motion directing staff to move forward on Option No. 1 - "Treat best
and replace remaining", for an emerald ash borer management plan for public ash
trees within the City.
Background
Emerald ash borer (EAB) is a non-native invasive insect which kills ash trees. It is
currently in the Twin Cities Metro area, with the closest confirmed infestation being
in Bloomington, MN. EAB has proven to kill all ash trees which are not chemically
treated and an infestation within Shakopee is inevitable.
City staff completed an inventory of City managed trees in 2014. It was determined
that 1 in 3 publicly managed trees are ash. A higher percent of street trees are ash
compared to park trees, as seen below.
•34% of street trees are ash (1500 ash trees)
• 18% of park trees are ash (500 ash trees)
•Certain parks have a much higher percent of ash-Riverview(100%),
Hiawatha (88%), Tahpah (36%), Lions (27%).
Based on the experiences of communities who have faced EAB, it is highly
beneficial to take a proactive management approach versus waiting for EAB to kill
trees and responding. Taking no management actions before EAB is confirmed in
our community will be more expensive, and will take a much higher
ecological, aesthetic, and social toll.
Staff analyzed five options for managing EAB. The options include different
combinations of ash removal, replanting, and chemical treatment (protecting trees).
A cost/benefit analysis was performed for each option. Options considered by staff
and the Park and Recreation Board are as follows:
Option 1: Treat best and replace remaining
Option 2: Treat best on high density streets and replace remaining
Option 3: Remove and replace all
Option 4: Remove all without replacement
Option 5: No management
The costs included removing, replanting, chemically treating, and maintaining the
trees. The benefits were calculated based on the monetary value trees provide in
relation to stormwater interception, energy consumption, property value, air quality,
and CO2 sequestration and reduction.
Details on management options, chemical treatment, and what to expect
when EAB arrives can be found in the attached document "Overview
of EAB Management Options". Maps associated with management options are also
attached
Staff will give a presentation during the meeting reviewing each management
option and issues the City will face due to EAB.
Recommendation
On March 9th 2015, the Parks & Recreation Board voted unanimously to
recommend Option 1- `Treat the best ash trees and replace the remaining' to City
Council. This is also the recommendation of City staff It protects —40% (-750) of
the public ash trees and removes and replaces the remaining (1100 trees). About
140 ash trees would be removed/replaced each year for the next 8 years with this
option. Those trees proposed to be protected are in general the largest most healthy
ash trees.
This recommendation is made based off of the following:
1. Provides the highest tree related benefits to the community
2. Has the highest return on investment
3. Has the least impact on community character
4. Allows for a more gradual transition from ash trees to other species.
5. An ash tree can be treated for 20-25 years before the cost of
removing/replacing that ash tree is reached
6. Offers a manageable workload to the City's Public Works Dept.
Budget Impact
Whether the City takes a proactive management approach or not, EAB will cost the
community money. It is estimated to cost over $1,000,000 to remove all public ash
trees without replacing them (which would need to be done if no management was
taken). The current staff recommendation would require an increase of$50,000 to
the Natural Resources budget starting in 2016. This would be funding treatment
($30,000) and replacement ($20,000) of public ash trees. It is estimated that the
Natural Resources budget would need to be maintained at this level for the
upcoming 8 years. After this, it is anticipated most ash not being treated would be
removed and replaced and treatment intervals would decrease-resulting in the
funding request being reduced. Tree removals are already budgeted for in Public
Works and no additional funding requests are anticipated at this time.
Current Natural Resources 2015 budget is at $138,660.00.
Relationship to Vision
This supports Goals A & D: Keep Shakopee a safe and healthy community where
residents can pursue active and quality lifestyles; and Deliver effective and efficient
public services by a staff of well trained caring and professional employees.
Requested Action
Approve a motion directing staff to move forward on Option No. 1 - "Treat best
and replace remaining",for an emerald ash borer management plan for public ash
trees within the City.
Attachments: Overview of EAB Management Options
Map of all public ash trees
Map of'Treat Best and Replace Remaining'
Map of'Treat Best on High Density Streets and Replace
Remaining'
City of Shakopee
Summary of EAB Management Options
February 13,2015
Additional resources (click on blue links):
List of EAB Webinars—here is a recommended webinar overviewing management options
http://www.emeraldashborer.info/
http://d nr.wi.gov/topic/UrbanForests/documents/EABTooI Box/EAB-LessonsShared.pdf
What is EAB?
Emerald ash borer is a non-native invasive insect thought to be brought into Michigan on shipping material and
discovered in 2002. It attacks and kills ash trees and has currently spread to many states in the northeast/midwest
region of North America and parts of Canada.
How close is EAB?
EAB has been confirmed within less than 15 miles of Shakopee, most recently in the Cities of Bloomington and
Eagan.So far the following Minnesota Counties have been quarantined (cannot move hardwood out of the county,
due to EAB): Hennepin, Houston,Olmsted, Ramsey,Winona,and Dakota.
What are our options?
EAB has been shown to kill 100%of ash trees not chemically treated in the communities that have experienced it.
This leaves us only two options: chemical treatment(which has proven effective)or removal.
What will happen if we take a'wait and see'approach instead of proactive management?
EAB is estimated to take 8-10 years from the initial infestation to kill all non-treated ash in a community.There is a
low probability of detecting an EAB infestation in the initial years(see table below). If detected after 3 years we
would have^'5 years to remove all of our ash trees,with the majority(1300 trees) needing to be removed in years
7-8.This situation would result in incredibly high workloads, costs,and environmental/aesthetic impacts.
"Waiting and doing nothing will be more expensive. It costs two to three times more to remove a completely
dead ash tree versus a declining but live tree.Waiting until EAB hits before you make a plan to remove,dispose of
and replant your ash may leave you with no contractors available, no markets for your waste wood and no trees to
buy and plant.Communities that planned ahead have funds to respond.Those that waited to react do not" (EAB
Lessons Learned in Michigan and Ohio).
Wa tand See
Expected Progression of EAB Damaged Trees and Likelihood of Detection To the right is an #Trees to
%Ash Trees Affected by estimate of what Year remove
<1 1 2 4 = 15 : 2 64 100 100 100 100 100 Shakopee's public 0 0
EAB
ash tree removal 1 19
Years Until All Ash Trees 2 19
would be with a
Are Damaged or Lost to 8 7 6 3 4 3 2 1 0 0 0 0 0 3 38
EAB 'wait and see' 4 77
approach.City staff 5 154
Likelihood of detection lo."; medium high currently averages 6 307
Source: Purdue University Extension, EAB Cost Calculator 20 removal 7 615
trees/year. 8 692
Total 1921
Is it probable that EAB is already in Shakopee?
EAB was confirmed in 2009 in the TC metro area. First found in South Saint Anthony Park in St. Paul.Since then it
has been confirmed in a number of areas in the east central portion of the metro, most recently in the cities of
Bloomington and Eagan. Due to Shakopee's close proximity to confirmed infestations and EABs history of
exponential population growth, it is assumed to be here but not yet detected.The analysis below assumes EAB is
present in Shakopee but affecting<1%of our ash.
1
How big of a problem is EAB?
EAB is now considered the most destructive forest pest ever seen in North America. It is estimated to cost the US
$10-20 billion and has already exceeded the destruction of Dutch elm disease.
If an ash tree is desired to be saved,when should treatment begin?
Researchers recommend waiting until EAB is confirmed within 15 miles of your location to begin treatment.The
EAB finding in the City of Bloomington is^'13 miles from Shakopee City Hall,this is the closest confirmed
infestation.To protect a tree from EAB,chemical treatment is required every 1-3 years.Although some have
concerns over use of pesticides,arguably,an equal or greater environmental impact exists for the loss of benefits
provided by mature ash trees.
If we begin treating ash,will we have to treat the tree the rest of its life?
EAB's population is expected to rise and fall in a matter of 8-10 years,ash desired to be saved will need to be
treated every 1-3 years at this time.After all of the non-treated ash have died,EAB's food source will be limited to
small regenerated ash(saplings), mostly in natural areas. EAB is expected to survive in our area with low numbers
into the future,posing a reduced threat to ash which survived the initial invasion wave.EAB management efforts
are beginning to occur on a region wide scale,biocontrol(stingless wasps intended to parasitize EAB)and a
strategy called Urban SLAM(which strategically treats limited ash to control EAB population) have potential to
reduce populations even further.These efforts are fairly new and research is ongoing.Currently it is recommended
to anticipate a treatment every 4-6 years after the rise and fall of EAB's population.This treatment interval could
possibly be lengthened with the efforts listed above and active sanitation of infested trees.
Treatment should not be looked at as something that is useless unless continued for the life of the tree. It can be
used as a tool to allow only an acceptable amount of EAB damage per year. Treatment can simply ease the
transition from mature ash to newly planted trees of other species, allow us to better manage costs, workloads,
retain a portion of the benefits mature ash provide us,and maintain the charter of our community.
Treatment should be looked at as a way for the City to control the management of our trees, rather than EAB.
Treatment is recommended as a fundamental component of an EAB management plan.
Shakopee's EAB Management Options
Not Treating Trees
Wait and see-
This plan will remove an ash tree after enough of it has been killed to make it likely to drop limbs or fall down. No
ash trees are replaced after removal. This plan should not be considered due to incredibly high spikes in workloads,
costs,and losses of environmental/aesthetic benefits.
Remove all without replacement-
All ash trees will be removed. No trees will be replanted. Removal will take place in a structured method as to
reduce spikes in costs and workloads.Remove 240 ash trees/year for 8 years.
Remove and replace all-
All ash trees will be removed and replaced with a new tree. Removal will take place in a structured method as to
reduce spikes in costs and workloads. Remove-replace 240 ash trees/year for 8 years.
Treating Trees
Treat best and replace remaining-
Saves^'40%of ash trees,the remaining ash trees will be removed and replaced (140 ash/year for 8 years).Those
saved are in general the largest and best condition trees.They must meet the following criteria to be candidates
for treatment:
• >11"tree diameter
• Condition rated as fair or better
• No utilities overhead or conflicting
2
Treat best on high density streets and replace remaining- • - g
Saves-30%of ash trees,the remaining ash trees will be removed and replaced (164 ash/year for
•
years).This option limits treatment to street segments*with a high density of mature ash trees and • • •
parks.The street segment percentage is calculated as such: (total diameter inches of all City managed • •
• E
trees on street segment/total diameter inches of City managed ash trees on street segment).Trees •
must meet the follow criteria to be candidates for treatment: •
•
• >11"tree diameter • •
•
•
• Condition rated as Fair or better •
•
• No utilities overhead or conflicting
• Located on a street segment with>=33%tree diameter as ash • •
• Located on a street segment with >=36"total ash diameter(this is due to some street segments • •
only having a few City managed trees) • •
• •
es* • E E
*Street segments are generally one block long(see red on image to right). E E *,
• •
Cost/Benefit Analysis
The cost/benefit analysis below uses the following information and assumptions:
EAB is present in Shakopee but affecting<1%of our ash trees.
Costs include tree/stump removal,replacement,treatment, and maintenance of existing trees for each year,
all based on tree diameter.
• Costs associated with EAB management were calculated using the EAB Cost Calculator produced by
Purdue University. Below are some of the values used in the calculator:
o Treatment Cost:$5/tree diameter inch (This is based on the average cost for a municipality to
hire a private contractor in the Midwest,treating with City staff would be an estimated$3.5/dia.
in).
• Years between treatments during EAB outbreak:2 years
• Years between treatments after outbreak(outbreak est. 12 years):4 years
o Replacement Cost:$130/tree(This is for a private contractor to plant a 1.5 caliper inch bareroot
tree).
o Removal Cost:$28.47/tree diameter inch (This is based on the average cost for City staff to
remove a tree and grind the stump in 2013).
o Maintenance Cost:$3.5/tree diameter inch/year(This is based off the 2006 Midwest
Community Tree Guide: Benefits,Costs,and Strategic Planting.General Technical Report PSW-
GTR-199)
o Benefits were calculated with the National Tree Benefit Calculator which is internationally used,
peer reviewed software.The calculator estimates the monetary value trees provide in relation to
stormwater interception,energy consumption, property value,air quality,and CO2 sequestration
and reduction.Calculations assumed it was a street side ash tree of the specified diameter in
front of a residential home.Other less researched benefits are not accounted for(e.g., human,
social,and communal health).
❑Stormwater ❑Property Value
O Electricity ❑Natural Gas
0 Air Quality Nc02 To the left is a breakdown
of the calculated annual
value a 14 diameter inch
$40 01 street side ash tree
$34.47 provides(totaling
$130/year). 14 diameter
inches is the average size
' of a Shakopee public ash
$16.22 $5.24
tree.
'w020, 4,,.-. $7.35
3
$26.84
Cumlative Costs and Benefits of EAB Management (Over the next 25 years)
$4,500,000
$4,000,000
$3,500,000
$3,000,000
$2,500,000 •Total
Cumlative
$2,000,000 Costs
•Total
$1,500,000
Cumlative
Benefits
$1,000,000
$500,000 "l
f1 So N f.'1 so f\
R l0 C'l
O N r h n 00
N V O M
$0 n v vt N
Remove and Replace All Treat Best Ash and Replace Remove All without Replacing Treat Best Ash on High Density
Remaining Streets and Replace Remaining
Figure 1.Shows cumulative costs and benefits of different EAB management options over 25 years.Also see
Table 1 at end of document.
Annual Cost of EAB for City Managed Trees
$400,000
--Remove and
Replace All
$350,000
$300,000
Wait and See
$250,000
',$200,000
—Remove all
Without
$150,000 Replacement
$100,000
—2 per.Mov.Avg.
Best and
$50,000 Replace
Remaining)
$0
O M C' ul SD r` CO Ql 0 •-■ N CO V 1.!) (0 N 00 m 0 .-1 N M V ul
.-4 4-1 ei e 1 ..l N N N N N N
>-
Figure 2.Shows annual costs of EAB management options over 25 years.The cost of chemically treating ash
fluctuates due to providing protection for 2-4 years,requiring multiple treatments through time.Options that
treat or replace ash account for maintenance costs of new or retained trees.See Table 2. at end of document
for more detailed information on annual costs.
4
Cumlative Costs of City Managed Ash Trees
$3,500,000
$3,000,000 —Remove and
Replace All
$2,500,000
—Treat Best and
Replace
$2,000,000 + -_______-
Remaining
$1,500,000 Remove all
Without
Replacement
$1,000,000
—Treat Best on
/ High Density
$500,000 Streets and
Replace
Remaining
$0
Jean ti ti 3 b h A % ,y0 'is' V y yb ,yh ti y1 yob yai ti0 tit i")" i> tib ti�
Figure 3.Shows the cumulative(total amount spent)of each EAB management option through time.See Table
1.for further information.
Cumlative Benefits of Retained City Managed Ash/Replacement Trees
$4,500,000
54,000,000
—Remove and
$3,500,000 Replace All
$3,000,000
—Treat Best
$$ and Replace
2,500,000
Remaining
$2,000,000
Remove all
Without
$1,500,000 Replacement
$1,000,000 —Treat Best on
High Density
Streets and
$500,000 Replace
Remaining
$0
O r-1 N fY1 ll1 lD f� W Cn O ,H ,1 ,-1 ,-1 ,-I c-I ,-I N ON N N N N N
Y
Figure 4.Shows the cumulative monetary value provided by retained or replaced City managed ash trees.
5
#of City Managed Ash Trees to Remove/Year
800
700
—Treat Best
and Replace
600 Remaining
—Wait and See
500
400
Remove all
300
—Treat Best on
■200
High Density
Streets and
100
Replace
Remaining
0
Year 0 1 2 3 4 5 6 7 8 9 10 11
Figure 5.Shows the number of public ash trees removed/year through the EAB infestation.This graph does not
include tree removals required for reasons other than EAB.
Return on Investment for EAB Management
200.00%
—Remove and
Replace All
150.00%
—Treat Best and
Replace
100.00% Remaining
Remove all
Without
50.00% Replacement
—Treat Best on
0.00
a —_ High Density
2 3 4 5 6 7 8 9 10 11 12 13 14 17 18 19 20 21 22 23 24 25 Streets and
Replace
Remaining
-50.00%
Figure 6.Shows the return on investment for each management option.
6
Table 1.Shows costs,benefits,net benefit,highest annual cost,and highest number of removal trees in one
year,for each management option.
Over the next 25 years
Total Total
Cumulative Cumulative Highest Highest#of ash
Costs Benefits Net Benefit Annual Cost to remove/year
Remove and Replace
All $1,945,646 $2,195,703 $250,057 $205,546 240
Treat Best Ash and $2,945,716 $4,264,620 $1,318,904 $223,425 140
Replace Remaining
Remove All without
Replacing $1,142,715 $971,338 ($171,377) $178,302 240
Treat Best Ash on
High Density Streets
$2,769,399 $3,897,709 $1,128,310 $208,339 164
and Replace
Remaining
Wait and See $1,540,819 $1,755,271 $214,452 $354,122 692
No EAB $1,452,560 $7,159,567 $5,707,007 $62,640 38
Table 2.Shows annual costs of each management option.
Annual Cost of EAB for City Managed Trees
Remove all Treat Best on High Treat Best and
Year Remove and Replace All Without Density Streets and Replace Remaining
Replacement Replace Remaining
1 $78,670 $88,352 $83,226 $83,757
2 $205,546 $178,302 $162,479 $155,657
3 $195,849 $167,317 $208,339 $210,464
4 $187,516 $157,108 $158,936 $164,993
5 $177,163 $145,653 $201,557 $213,019
6 $175,783 $143,161 $155,702 $150,261
7 $177,358 $141,103 $202,993 $223,425
8 $174,958 $121,719 $164,529 $127,639
9 $19,867 $0 $119,483 $118,794
10 $22,013 $0 $55,081 $63,171
11 $24,071 $0 $105,707 $124,615
12 $26,031 $0 $58,433 $66,723
13 $27,903 $0 $109,535 $129,031
14 $29,683 $0 $62,630 $70,109
15 $31,357 $0 $64,179 $71,742
16 $32,982 $0 $65,635 $73,128
17 $34,530 $0 $117,019 $136,520
18 $35,985 $0 $68,152 $75,959
19 $37,424 $0 $69,659 $77,543
20 $38,781 $0 $68,790 $76,813
21 $40,097 $0 $120,761 $140,323
22 $41,331 $0 $71,409 $80,126
23 $42,519 $0 $71,794 $81,345
24 $43,611 $0 $75,564 $82,454
25 $44,621 $0 $127,807 $148,104
7
City of Shakopee December 30th, 2014
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Shakopee EAB Management Options
March 3rd, 2015
Map of 'Treat Best and Replace Remaining'
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121,T32 us 169 s US 169 N are located in Southbridge area*
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0.5 0.25 0 0.5 Miles
E Ash meeting criteria for chemical treatment (Save) • Ash trees to be removed
Shakopee EAB Management Options March 3rd, 2015
Map of 'Treat Best on High Density Streets and Replace Remaining'
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'� ADDIeb{ossom Ln W ADP'„ -.
Ug 69$
• °°rt.L°` -=-- are located in Southbridge area*
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0.5 0.25 0 0.5 Miles