HomeMy WebLinkAbout2012-04-04 PACKET 08.A.REQUEST OF CITY COUNCIL ACTION COUNCIL AGENDA
MEETING ITEM #
DATE 4/4/12
PREPARED BY Community Development John McCool
ORIGINATING DEPARTMENT STAFF AUTHOR
COUNCIL ACTION REQUEST
1. Consider approving a conditional use permit to allow construction of a 20 kW wind turbine
consisting of a 99 -foot monopole with 30 -foot diameter rotor at Werner Electric, 7450 95th Street.
2. Consider approving a variance to the 1,320 -foot minimum setback between a wind turbine structure
and conservation easements or public parks to allow the proposed wind turbine to be approximately
230 feet from Hamlet Park's boundary.
STAFF RECOMMENDATION
Approve the conditional use permit and variance for a wind turbine at Werner Electric.
BUDGET IMPLICATION $N /A $N /A N/A
BUDGETED AMOUNT ACTUAL AMOUNT FUNDING SOURCE
ADVISORY COMMISSION ACTION:
DATE
REVIEWED
APPROVED
DENIED
® PLANNING 3/26/12
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❑ PUBLIC SAFETY
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❑ PUBLIC WORKS
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® PARKS AND RECREATION 2/13/12
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❑ HUMAN SERVICES /RIGHTS
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❑ ECONOMIC DEV. AUTHORITY
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SUPPORTING DOCUMENTS
® MEMO /LETTER: Memo from John McCool dated 3/29/12
® RESOLUTION: Draft
❑ ORDINANCE:
❑ ENGINEERING RECOMMENDATION:
❑ LEGAL RECOMMENDATION:
® OTHER: Neighborhood petition dated 3126/12
Excerpt from unapproved minutes of 3/26/12 Planning Commission meeting
Excerpt from 2/13/12 Parks Commission minutes
Ben Granley's (Werner Electric) email message dated 3/29/12
ADMINISTRATOR'S COMMENTS
v�
cJ /:
City Administrator Date
COUNCIL ACTION TAKEN: []APPROVED ❑ DENIED ❑ OTHER
CITY OF COTTAGE GROVE
MINNESOTA
TO: Mayor and Members of the City Council
Ryan Schroeder, City Administrator
FROM: John McCool, Senior Planner
DATE: March 29, 2012
RE: Werner Electric's Proposed Wind Turbine Project — Variance and Conditional Use
Permit Applications
Proposal
Werner Electric has submitted variance and conditional use permit applications to install a 20
kilowatt wind turbine on top of a 99 -foot tall monopole on their property located at 7450 95th
Street. The variance application pertains to the Zoning Ordinance regulation that requires a
1,320 -foot minimum setback between the wind turbine structure and conservation easements or
public parks. Werner Electric is proposing a setback of approximately 230 feet from Hamlet
Park's boundary.
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Location Map
Advisory Commission Recommendations
Planning Commission
The Planning Commission reviewed Werner Electric's variance and conditional use permit appli-
cations at a public hearing on March 26, 2012. Ben Granley, representing Werner Electric at-
tended the meeting and made a short presentation and responded to the Planning Commission's
questions about the project.
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Honorable Mayor Bailey, City Council Members and Ryan Schroeder
Werner Electric's Wind Turbine Project — Variance and Conditional Use Permit Applications
March 29, 2012
Page 2 of 9
A petition opposing Werner Electric's variance and conditional use permit applications was sub-
mitted to the Planning Commission. This petition contained 25 signatures representing 21 neigh-
boring residential properties. The petition included eight statements objecting to this project. Oral
testimony was also received at the public hearing. Many of the comments were similar to the
concerns listed in the petition, and others wanted the wind turbine to be located on the east side
of Werner Electric's property. A copy of the petition is attached.
The Planning Commission discussed the Zoning Ordinance regulations relative to setbacks from
park land versus residential property, decibel levels at varying wind speeds, and alternative loca-
tions to place the wind turbine on Werner Electric's property. The applicant stated that the pro-
posed wind turbine location is closest to their building and is the preferred location because it will
not interfere with future expansion plans for their customer /employee parking lot, office, ware-
house, and loading dock/truck parking areas. Neighboring residents expressed concerns for po-
tential flickering effects, adverse visual and noise impacts, and maintaining their residential
property values.
The illustration below highlights the future site improvements, the proposed location of the wind
turbine and the northeast corner location that was discussed at the Planning Commission meet-
ing. The distance between the proposed wind turbine and the closest residential dwelling is about
430 feet. Property owners that signed the petition opposing Werner Electric's wind turbine are
shown in the yellow cross -hatch pattern.
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approval In 2011
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Future Loading Dock and
Truck Parking Expansion
83,500 sq.ft.
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Petitioners Shown in
Yellow Crosshatch Patterns
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95TH ST S
Honorable Mayor Bailey, City Council Members and Ryan Schroeder
Werner Electric's Wind Turbine Project — Variance and Conditional Use Permit Applications
March 29, 2012
Page 3 of 9
The Planning Commission's recommendation to the City Council is to grant a variance to the
1,320 foot setback requirement from the Hamlet Park boundary to 230 feet and approve the con-
ditional use permit for the 20 kW wind turbine on a 99 -foot tall monopole at the location proposed
by Werner Electric. This recommendation passed by a 7 -to -2 vote. An excerpt from the Planning
Commission's unapproved minutes is attached.
Since the Planning Commission meeting, Werner Electric has provided additional information re-
garding the additional cost if the wind turbine was placed in the northeast corner of their site and
a comparison of wind patterns between the preferred location and northeast corner of their site. A
copy of their findings is attached.
Planning Considerations
Ordinance Criteria
The Wind Energy Conversion System (WECS) ordinance allows wind turbines in industrial zoning
districts by conditional use permit. This proposed monopole and 20 kilowatt wind turbine is de-
fined as a small wind energy conversion system. The maximum height of a WECS in the 1 -2 Dis-
trict is 150 feet and the maximum diameter of the rotor and blades is 50 feet. Werner Electric's
proposed wind turbine does not exceed either of these ordinance limitations. With the exception
of the 1,320 foot minimum setback requirement from public parks, all other components of the
wind turbine proposed by Werner Electric comply with other Zoning Ordinance regulations.
The ordinance requires a minimum setback of 1.1 times the wind turbine's height from the prop-
erty line. No additional setback is required from residential zoning districts or residential uses.
The Planning Commission may recommend a variance from the strict application of the provision
of this title, if they find that:
1. The variance is in harmony with the purposes and intent of this title.
2. The variance is consistent with the comprehensive plan.
3. The proposal puts the property to a reasonable use.
4. There are unique circumstances to the property not created by the landowner.
5. That the conditions upon which an application for a variance is based are unique to the
parcel of land for which the variance is sought and are not applicable, generally, to
other property within the same zoning classification.
6. That the purpose of the variance is not based exclusively upon a financial hardship.
7. That the granting of the variance will not be detrimental to the public welfare or injurious
to other land or improvements in the neighborhood in which the parcel of land is lo-
cated.
8. That the proposed variance will not impair an adequate supply of light and air to adja-
cent property, or substantially increase the congestion of the public streets, or increase
the danger of fire, or endanger the public safety.
Comprehensive Plan Conformance
The Future Land Use map in the City's approved Future Vision 2030 Comprehensive Plan desig-
nates this property for industrial land uses. The General Industry (1 -2) zoning classification and
the current use of this property are consistent with the Comprehensive Plan.
Honorable Mayor Bailey, City Council Members and Ryan Schroeder
Werner Electric's Wind Turbine Project — Variance and Conditional Use Permit Applications
March 29, 2012
Page 4 of 9
Property Characteristics
Werner Electric's site is approximately 20 acres in land area. Their office and warehouse facility is
a one -story building approximately 116,496 square foot in size. When the City initially reviewed
this project in 2007, Werner Electric's site plan showed a 12,076 square foot office addition, an
83,500 square foot warehouse addition, and 117 additional parking spaces. There were 183
parking spaces constructed with the initial construction phase. A copy of their site plan is shown
below.
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The site is approximately 25 feet lower than the main level of the houses along the east side of
Harkness Avenue. The distance between the proposed wind turbine location and the closest
dwelling is approximately 450 feet and to Hamlet Park's eastern boundary is approximately 230
feet. The City owns a 50 -foot wide strip of land that abuts the east boundary line of the residential
properties along the east side of Harkness Avenue. Along the east side of this 50 -foot strip is an
additional 100 feet of land that is part of the Hamlet Park property. An aerial photo of Werner
Electric's site is shown below.
Honorable Mayor Bailey, City Council Members and Ryan Schroeder
Werner Electric's Wind Turbine Project — Variance and Conditional Use Permit Applications
March 29, 2012
Page 5 of 9
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Proposed Wind
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Wind Turbine
Werner Electric is proposing to install a 20 kilowatt wind turbine manufactured by Renewegy. The
rotor and blades have a 15 -foot diameter and will be mounted on top of a 99 -foot monopole. A
copy of the proposed VP -20 model's data sheet is attached and photographs of this model are
shown below.
A copy of Werner Electric's letter to the Parks, Recreation, and Natural Resources Commission is
attached. This letter highlights the applicant's introductory comments about the wind turbine they
proposed to install and their outreach effort to neighboring property owners. As mentioned at the
Parks Commission meeting, the proposed wind turbine will supplement their electrical power and
will also be used to market/sell as part of their clean energy initiatives.
Photographic Illustrations
The proposed wind turbine and monopole have been superimposed on two landscape images to
provide a visual idea how it might appear on Werner Electric's property. Both images are dis-
played below.
Honorable Mayor Bailey, City Council Members and Ryan Schroeder
Werner Electric's Wind Turbine Project — Variance and Conditional Use Permit Applications
March 29, 2012
Page 6 of 9
99 foot monopole with a
30 foot diameter rotor.
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Looking southeast from Hamlet Park
Wind Speed Graph
Werner Electric had wind velocity measured at the site twice in October, twice in November, and
once in December 2011. The average wind velocity for these five days was approximately seven
Looking north from 95th Street
Honorable Mayor Bailey, City Council Members and Ryan Schroeder
Werner Electric's Wind Turbine Project — Variance and Conditional Use Permit Applications
March 29, 2012
Page 7 of 9
miles per hour and the average gust velocity was about 11 miles per hour. The wind speed graph
is shown below.
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Satou Tiilr
Wind Velocity mEmmmm iGust Velocity
Wind Turbine Sound Level
The siting of wind turbines is largely a land use and neighborhood compatibility issue. It is impor-
tant to recognize potential problems and address them appropriately so that sound levels which
may be created by the wind turbine are not intrusive for neighboring land uses.
Werner Electric's proposed 20kW single unit wind turbine is relatively small as compared to light
commercial wind turbines that could range from 20 kW to 300 kW. The applicant is proposing to
place the wind turbine on the southwest corner of their building because it is closest to the build-
ing and will not be in the way of their future expansion plans for the warehouse, employee /cus-
tomer parking, and delivery truck /loading dock areas. This location was presented to neighboring
residential property owners and to the Parks, Recreation and Natural Resources Commission.
Based on initial feedback from neighboring property owners and Parks Commission, potential
visual or sound impacts were not perceived to be significant.
The applicant has included in their application submittal a graph estimating the sound levels of
this particular wind turbine model at varying distances. The horizontal distance between the base
of the monopole and the eastern Hamlet Park boundary line is approximately 230 feet and to the
closest residential dwelling is approximately 450 feet.
Honorable Mayor Bailey, City Council Members and Ryan Schroeder
Werner Electric's Wind Turbine Project — Variance and Conditional Use Permit Applications
March 29, 2012
Page 8 of 9
VP -20 Average Sound Levels with Distance
100.0
90.0
80.0
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Q 70.0
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40.0
30.0
Approximate Sound Levels:
30 d8 - Quite Whisper at 1m
40 d8 - Residential Area at Night
50 68 - Quiet Business office
60 d8 - Normal Conversation at 1m
70 d6 - Automobile at 20m
80 d8 - Heavy Traffic
90 d6 - Semi - Trader at 20m
100 d8 - home lawnmower or Weed - Whacker
AlC .7 v ..dar Y.YCK.
150.0 200.0 250.0 300.0 350.0
Distance ftom Turbine (feet)
Neighborhood Information Meeting
On January 26, 2012, Werner Electric hosted an information meeting at their facility. Surrounding
property owners were invited to attend this meeting. Ten residents from 60 invitations attended
the meeting. Nine of the ten residents supported Werner Electric's wind turbine proposal.
Advisory Commission Comments
Werner Electric made a presentation to the Parks, Recreation and Natural Resource Commission
on February 13, 2012. The Commission unanimously supported the proposed setback variance
as proposed by Werner Electric. An excerpt from the approved Parks, Recreation and Natural
Resources Commission is attached.
Public Meeting Notices
A public meeting notice was published in the South Washington County Bulletin and notices were
mailed to 61 property owners who are within 500 feet of this site. These notices were mailed on
March 14, 2012. The location map shows the 500 -foot buffer around the site.
Recommendation
That the City Council accepts the Planning Commission's recommendation to approve the following
planning applications for Werner Electric's wind turbine project:
1. A variance to the Zoning Ordinance regulation that requires a 1,320 -foot minimum setback
between the wind turbine structure and conservation easements or public parks. Werner
Electric is proposing a setback of approximately 230 feet from Hamlet Park's boundary.
010 solo 1001e
Honorable Mayor Bailey, City Council Members and Ryan Schroeder
Werner Electric's Wind Turbine Project — Variance and Conditional Use Permit Applications
March 29, 2012
Page 9 of 9
2. The conditional use permit application for the construction of a 20 kW wind turbine consisting
of a 99 foot monopole with 30 foot diameter rotor and blades as shown on Werner Electric's
site plan dated February 29, 2012 (date stamped as Received by the City of Cottage Grove).
The findings of fact and conditions of approval as recommended by the Planning Commission are
included in the attached draft resolution.
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A RESOLUTION APPROVING A CONDITIONAL USE PERMIT TO ALLOW
INSTALLATION OF A 20 KILOWATT WIND TURBINE AT WERNER ELECTRIC,
7450 95TH STREET SOUTH, AND A VARIANCE TO REDUCE THE 1,320 FOOT
MINIMUM SETBACK REQUIREMENT FROM PUBLIC PARK OR
CONSERVATION EASEMENTS TO 230 FEET
WHEREAS, Werner Electric has applied for aconditional use permit to allow the
installation of a 99 -foot tall 20 kilowatt wind turbine with three 15 -foot long blades and a
variance to reduce the 1,320 foot minimum setback requirement from public park or
conservation easements to 230 feet, onthe property is legally described as:
That part of the Northwest Quarter of Section 20, Township 27, Range 21,
Washington County, Minnesota, described as follows:
Beginning at the Southeast corner of said Northwest Quarter of said Section 20;
thence North 00 degrees 07 minutes 30 seconds East, assumed bearing along the
East line of said Northwest Quarter, 1303.00 feet; thence North 90 degrees 00
minutes 00 seconds West, 820.05 feet; thence South 00 degrees 07 minutes 30
seconds West, 591.24 feet; thence South 39 degrees 42 minutes 41 seconds East,
436.89 feet; thence South 24 degrees 00 minutes 42 seconds East, 181.43 feet;
thence South 00 degrees 11 minutes 40 seconds East, 211.55 feet to the south line
of said Northwest Quarter; thence easterly along said south line, 464.81 feet to the
point of beginning.
Said description contains ±20.54 acres or ±894,871 square feet.
Commonly known as 7450 95th Street South, Cottage Grove, Washington County,
State of Minnesota.
WHEREAS, public hearing notices were mailed to property owners within 500 feet of the
property and a public hearing notice was published in the South Washington County Bulletin; and
WHEREAS, the Planning Commission held a public hearing on March 26, 2012; and
WHEREAS, a planning staff report, which detailed specific information on the property and
the application request, was prepared and presented; and
WHEREAS, the public hearing was open for public testimony and testimony from the
applicant and the public was received and entered into the public record; and
WHEREAS, a petition opposing the applicant's wind turbine project contained the
signatures of 25 residents representing 21 residential properties was presented to the Planning
Commission. Their concerns pertained to potential visual and noise pollution and property values.
The petition has been placed on file and is available for public viewing; and
Resolution No. 2012 -XXX
Page 2 of 3
WHEREAS, the Planning Commission reviewed the criteria and findings established by
the Zoning Ordinance for granting a variance. A summary of these criteria is as follows: Is the
variance in harmony with the purposes and intent of the ordinance? Is the variance consistent
with the comprehensive plan? Does the proposal put property to use in a reasonable manner?
Are there unique circumstances to the property not created by the landowner? Will the va-
riance, if granted, alter the essential character of the locality? The City may impose conditions
and safeguards in granting any variance.
WHEREAS, the Planning Commission on a 7 -to -2 vote recommended to the City
Council that the conditional use permit and variance applications be granted based in the
findings of facts and the conditions of approval listed in the planning staff report.
NOW, THEREFORE BE IT RESOLVED, the City Council of the City of Cottage Grove,
Washington County, Minnesota, hereby approves the conditional use permit to allow the
installation of a 99 -foot tall, 20 kilowatt wind turbine that has three 15 -foot long blades and a
variance to reduce the 1,320 foot minimum setback requirement from public park or
conservation easements to 230 feet, on the property legally described above.Granting of this
conditional use permit and variance is based upon the following findings of fact:
A. The Wind Energy Conversion System Ordinance (WECS) defines a small wind
turbine as having a total rated capacity less than 50 kW. The wind turbine model
proposed by Werner Electric is a 20 kW unit and only one unit is proposed on their
site.
B. Werner Electric invited neighboring property owners to attend an information
meeting and attending property owners generally supported the applicant's wind
turbine proposal.
C. The monopole height is 99 feet with a rotor diameter of 30 feet.
D. The City's Parks, Recreation and Natural Resources Commission reviewed Werner
Electric's variance application and supported the placement of the wind turbine to be
not less than 230 feet from the Hamlet Park boundary.
E. The proposed location is closest to their main building without impacting their future
plans to expand their facility, parking areas and docking area.
F. The variance is in harmony with the purposes and intent of the Zoning Ordinance.
The property is zoned General Industry and the proposed monopole structure and
wind turbine size complies with installation, design and siting regulations required in
the Zoning Ordinance. The requested variance setback from the Hamlet Park
boundary line will not adversely impact the use of this park amenity.
G. The variance request is not specifically addressed in the City's Future Vision 2030
Comprehensive Plan, but its industrial characteristics are consistent the industrial
land use designation for this property.
H. The proposal continues a reasonable use on the property.
Resolution No. 2012 -XXX
Page 3 of 3
I. The unique circumstances to the property were not created by the landowner. The
parcel of land is not large enough to comply with 1,320 foot setback requirement for
the proposed wind turbine.
J. The purpose of the variance is not based exclusively upon a financial hardship. The
proposed wind turbine is an alternative sustainable energy resource that will reduce
their electrical power usage from a private utility company.
K. The granting of the variance should not be detrimental to the public welfare or
injurious to other land in the neighborhood. The proposed wind turbine will not impair
an adequate supply of light and air to adjacent property. It will not create congestion
in the public streets, become a fire danger, or endanger the public's safety.
BE IT FURTHER RESOLVED, the approval of this conditional use permit and variance
is subject to the following conditions:
All applicable permits (i.e., building, electrical, grading, and mechanical) and a
commercial plan review packet must be completed, submitted, and approved by the
City prior to the commencement of any construction activities. Detailed construction
plans must be reviewed and approved by the Building Official and Fire Marshal.
2. Except for the minimum setback variance for the wind turbine, Werner Electric must
comply with all other City ordinances and policies.
3. Werner Electric must abide by Title 11 -6 -17, Noise Control regulations of the City's
Zoning Ordinance.
4. Lights, reflectors, flashers, or other illumination attached to the wind turbine or
monopole is prohibited unless those devices are required by the Federal Aviation
Administration.
Passed this 4th day of April 2012.
Myron Bailey, Mayor
Attest:
Caron M. Stransky, City Clerk
From: Granley, Ben <BGranley @WernerElec.com>
Sent: Thursday, March 29, 2012 5:14 PM
To: John McCool
Subject: RE: Wind Turbine - Cost Comparison
John,
When considering the move of the turbine to the Northeast corner there are 2 main factors that are present; cost and
wind turbulence.
Our estimate for additional cost to locate the turbine to the northeast corner is $10,000 - $15000. This represents a 12-
15% increase in the project's cost. This cost adder is for:
• Additional materials to run the electrical connection to this location. This is very expensive do to the fact that
the connection needs to occur at our service entrance. The service enters the building next to our city desk
location on the other side of the facility.
• Additional fill dirt and /or logistical support to get concrete trucks back to this location. We would either need to
pump the concrete or put in a temporary drive to get the concrete to this location.
• Lift rentals for running the power in the ceiling of our warehouse to create the shortest distance possible.
• Concrete safety bollards for protection of the unit. There normally isn't traffic back this far on our lot but there is
equipment traffic in the winter as we manage our snow piles throughout the winter season.
Between the 2 factors, the wind turbulence worries me more than the cost. There are some general guidelines when it
comes to placement of wind turbines and the effect of homes, trees, and buildings on low level wind stream patterns. I
will speak to 2 scenarios to describe this. The first being if the turbine was placed on the southwest side of our building,
and the second if the turbine was placed on the northeast side of our building. In general for both scenarios, as your
move higher in elevation there is a natural increase in wind speed (Fig 4), and there is a natural "floor" that happens
when an object obstructs the wind flow that has to be compensated for (Fig 2).
1. Southwest
a. As wind blows over the neighborhood on Harkness Avenue, it drops off on the backside of the homes
and down the hill towards Werner. This flow creates a turbulence bubble on the backside of the homes
with a depth equal to 20x the height of the homes. We are estimating this bubble to be close to 400 -450
feet. The largest intensity of this bubble occurs closest to the hill and dies off as it gets closer to Werner.
(See Fig 1) The estimated distance of the wind turbine to the homes is 430 feet which puts the
placement of the wind turbine in a relatively good location with all factors considered. The size of the
bubble and the turbine placement in relation to the bubble has an extreme effect of the turbines ability
to produce power. This also has a large effect on the wear of the unit, mainly as you get more and more
wind shear and ground resistance the wind pattern is distorted and that puts unwanted wear on the
bearings, generator, and other parts within the turbine. With the southwest location these concerns are
minimal as the turbine is outside of the turbulence bubble.
2. Northeast
a. As the wind blows from Harkness Avenue, down the hill, and over the Werner Electric facility, a second
turbulence bubble is created. This bubble is taller and longer due to the fact that our facility is much
taller than the homes and our buildings width at the face of the wind is wide. We estimate this bubble to
be at least 80 feet tall and have a length of close to 800 feet. This puts the end of the bubble at
Hemmingway Avenue. With the limitations of the lot and setback lines on the Northeast corner, the
turbine would be located approximately 125 feet from the back of the Werner warehouse. This
placement puts the turbine in the zone for the highest turbulence (Fig 1, Fig 3). This is very concerning
because not only would the output of the unit be dramatically lower, but the anemometer on the
turbine would get false readings and it would have a difficult time determining the actual direction of
the wind to adjust its rotation and blade pitch to maximize power.
After this additional analysis and because this unit's purpose is to generate power the only logical location is the
Southwest corner; closer to the residential area. Not only is this the best location for the wind, but it is also the best
location to wire the turbine into our utility entrance which is less than 100 ft away.
If we were only putting up the unit to showcase it (as purported by some of the local residents during the planning
commission), the location would be irrelevant but this is simply not the case
The residents have also shown concern for the impact of the wind turbine on property values. Here is a link
( http: / /sdge.com/ sites / default / files /newsroom /pdf /Ibnl- 2829e.pdf to a study on this subject, funded by the US
Government, and conducted by the Ernest Orlando Lawrence Berkeley National Laboratory. In summary, the report
finds that:
"The concern that property values will be adversely affected by wind energy facilities is commonly put forth by
stakeholders. Although this concern is not unreasonable, given property value impacts that have been found near high
voltage transmission lines and other electric generation facilities, the impacts of wind energy facilities on residential
property values had not previously been investigated thoroughly. The present research collected data on almost 7,500
sales of single family homes situated within 10 miles of 24 existing wind facilities in nine different U.S. states. The
conclusions of the study are drawn from eight different hedonic pricing models, as well as both repeat sales and sales
volume models. The various analyses are strongly consistent in that none of the models uncovers conclusive evidence
of the existence of any widespread property value impacts that might be present in communities surrounding wind
energy facilities. Specifically, neither the view of the wind facilities nor the distance of the home to those facilities is
found to have any consistent, measurable, and statistically significant effect on home sales prices. Although the
analysis cannot dismiss the possibility that individual homes or small numbers of homes have been or could be
negatively impacted, it finds that if these impacts do exist, they are either too small and /or too infrequent to result in
any widespread, statistically observable impact."
Could you please make sure all of this information is appended to the report to the council? Thank you for your time.
All reference figures are from "A practical guide to small scale energy production, Power from the Wind." Authored by
Dan Chiras
Fig 1
Site Quality Terrain Turbulence Intensity
Factor
Good Well Exposed 15%
Some Ground Ctutter,
Average Scattered Trees, Buildings 20%
Many Trees or Buildings, or
Poor Site at Lower Elevation than 25%
Cm irrni,ndinsc
3
f
2H
Fig 3
EMS=
Arrow
length
indicates
rind speed
m
ground clutter
to recover
Fig 4
4
Wind profile
Wind profile
over open
altered by
--4-
field
trees
Wind speed
increases
rapidly with height
ffective
117
r grotind
surface
Little or
no wind
Fig 3
EMS=
Arrow
length
indicates
rind speed
m
ground clutter
to recover
Fig 4
4
BEN GRANLEY
P: 651 769 8093 • F: 651 - 768 -5205 • M. 612 - 363 -8167
BGranlev @WernerElec.com
WERNER ELECTRIC - Solution • Supply • Support
7450 95th Street South, Cottage Grove, MN 55016
www.wernermn.com • Facebook • Twitter • YouTube
Monday, March, 26, 2012 RECEIVE
MAR 2 6 2012
CITY OF COTTAGE GROVE
To: City of Cottage Grove Planning Commission and City Council
Subject: Werner Electric
The undersigned residents of the City of Cottage Grove oppose the
application of Werner Electric for a wind turbine conditional use permit and a set-
back variance (case CUP 12 -011 and V12 -012). Our main reasons for our strong
opposition to this application include the fact that the proposed wind turbine
project will result in:
1. Substantial visual pollution and nuisance impacting our near -by
residential properties.
2. Noise pollution and nuisance due to the close proximity of many near -by
residential properties.
3. Significant property value reductions of near -by residences due to items
one and two listed above.
4. Substantial difficulty in selling our properties since most of our
residences on Harkness Avenue have patios, decks, eating areas, and
bedrooms facing the proposed wind turbine.
5. Increased negative impact on near -by residences due to residential
elevations relative to proposed wind turbine.
6. Significant adverse impact on use and enjoyment of near -by residences
and decrease in property values, in large part, to permit applicant to
sent wind turbines.
7. Total negation of ordinance set -back specifications resulting in negative
impact on use and enjoyment of public park.
8. Non - harmonious use when compared to existing low profile and
attractive light industrial building.
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` • • •
6.2 Werner Electric Wind Turbine — CUP12 -011 and V12 -012
Werner Electric, 7450 95th Street South, has applied for a conditional use permit to allow
the installation of a 20 kilowatt wind turbine and a variance to the required setback from
public park or conservation easements.
McCool summarized the staff report and recommended approval based on the findings of
fact and subject to the conditions stipulated in the staff report.
Rambacher asked if the sound levels and distance information was provided by the
manufacturer or by a third party. Ben Granley, Werner Electric, 7450 95th Street, responded
they received the information from the manufacturer.
Brittain asked what the basis is for the 1,320 -foot setback from public park and conservation
easements. McCool explained that when the wind turbine ordinance was adopted in 2009,
there was discussion on if wind turbines would have adverse sound impacts to park and
open space. Based on the information provided to the City, we implemented the quarter mile
setback from parks. Brittain asked if the City is considering changing that in the future.
McCool responded no, noting that larger wind turbines could have more of impact on sound,
and staff would prefer to review that on a case -by -case basis. Brittain asked if there is any
information on the noise modulation that would be generated and about the variation in
decibels that are perceivable by the adjacent homes. Granley responded that he does not
have specific information on the variation of sound. He displayed a graph showing the
decibel levels. He believes that the variation would come when the turbine starts and stops
moving. Brittain stated that with a wind turbine there is a cyclical frequency as the blades
rotate. He explained that a five decibel difference in sound levels is very noticeable, which is
why he is curious about what type of variation could be expected. Granley responded that 40
decibels is the loudest the unit would get, so if there is a variation, it would be quieter. He
believes the sound would be negligible at the homes that are 400 feet away. Brittain asked
what the setback is from residential properties. McCool responded 1.1 times the height of the
wind turbine. Brittain asked if the FCC is requiring lights on top of the turbine. Granley stated
that they are far enough from the nearest airport that the FAA would not require lights. He
noted that one of the conditions of approval is that lights would not be allowed unless
required by the FAA.
Reese asked what the average height is for cell towers. McCool responded about 100 feet.
Reese then asked how loud this would be compared to truck traffic coming into the site.
Granley responded much quieter; typically semi -truck traffic at 20 meters is between 70 and
90 decibels. Reese asked with their future warehouse expansion, if the truck traffic would be
more noticeable to residents than the turbine. Granley stated that as part of their
neighborhood meeting regarding the approval and permitting of this project, the one resident
in opposition voiced concerns about truck traffic noise. As part of their expansion, if they
receive approval, they will add a second driveway to divert truck traffic away from the
residences.
Excerpt from Unapproved Planning Commission Minutes
Werner Electric Wind Turbine — Case Nos. CUP12 -011 & V12 -012
March 26, 2012
Page 2 of 7
Jason Weis, 9421 Harkness Avenue South, stated that he has a few concerns about this
project. He is not worried that it will be too loud but about the variation of sound due to the
oscillation. He is also concerned about oscillating shadows from the blades and the light
pollution from the auto marshaling rail yard. He asked why the proposed location was
chosen when the Werner Electric property is large. He would prefer to have the turbine on
the other side of the property as far away from the residences as possible. He expressed
regret that he did not attend the neighborhood meeting held by Werner Electric.
John Magee, 9429 Harkness Avenue, passed out a petition signed by community residents.
He stated everyone who signed the petition is grateful for the partnership of Werner Electric
in our community and are passionate about conservation and the introduction of alternative
energies. In principle, they agree with the desire by Werner Electric to have a wind turbine,
but they oppose this project. He read from the petition their reasons for the opposition,
including substantial visual pollution; noise pollution due to its close proximity to residential
properties; significant property value reduction of nearby residences; difficulty in selling the
properties; increased negative impact due to residential elevations that are about 25 feet
above Werner Electric's site, which would put the blades closer to the homes; a significant
adverse impact on the use and enjoyment of their properties; negative impact on the use and
enjoyment of public parks; and non - harmonious use when compared to existing low profile,
attractive light industrial buildings.
Granley displayed a map that shows areas on the property that would not work for the
location of the wind turbine, explaining that the reasons those locations would not work
include drainage and utility easements, future building and parking lot expansion areas, the
fall zone (1.1 times the height of the unit from the property line), and a storm water system.
There are only two areas on their property that the turbine could be located, the proposed
location and an area by 95th Street. Based on those two options, they decided the best was
closer to their office. They would be open to having the unit placed on a parking lot island or
to any area that would work with their parking requirements. The proposed location does not
affect green space or their parking capacity.
Jerry Lee, 9445 Harkness Avenue, asked if any studies have been done that shows a
positive impact of a wind turbine on residential properties instead of negative. McCool
responded the City has not done any study about positive impacts to residential properties.
Granley stated that when they are not using the power generated by the wind turbine, the
closest neighboring properties, including the residential area and the park would be powered
by this unit. The power gets sold to the utility and used within the closest proximity.
Commission member Wehrle asked if Werner received cost estimates for alternate locations
for the wind turbine to the south or east. Granley responded not yet; the costs would consist
of additional wire and conduit, digging expenses, drudging under the driveway, and drainage
issues. They are open to relocating it, but prefer the proposed location. Rostad asked if they
have looked into the northern portion of new parking lot expansion. Granley stated that they
have already expanded some of the parking, and would need to field verify ensure they have
Excerpt from Unapproved Planning Commission Minutes
Werner Electric Wind Turbine — Case Nos. CUP12 -011 & V12 -012
March 26, 2012
Page 3 of 7
enough space for the additional parking they need for truck traffic and future egress as they
expand the office space to the side. He noted that the grade changes at the back of their
property, going down the side of a hill into a storm water drainage area.
Reese asked about the width of the monopole. Granley responded it is two to three feet in
diameter and needs a 16 -foot concrete base underground. Reese asked if the utilities are
underground. Granley replied yes. Reese asked if there would be any issues with the
parking lot over the utilities. Granley responded no. Reese then asked if the tower could be
closer to the property in that area. McCool responded that they would have to request a
variance from 1.1 setback distance, explaining that the wind turbine is 114 feet and the
minimum setback requirement would be 127 feet. Reese inquired what abuts their property
on that side. McCool responded there is a drainage ditch along the east property line. He
explained that is vacant property owned by Canadian Pacific.
No one else spoke. Rostad closed the public hearing.
Pearson asked if the noise changes with the wind speed. Granley stated that 40 decibels is
the loudest it would get. The unit is rated at 55 miles an hour maximum speed. When the
wind is 55 miles an hour, the blades are moving their fastest and the hum from the generator
is the loudest. When the wind speeds are less, the unit is quieter. He was next to a unit that
was running at its fastest speed and the noise levels represented on the graph are similar to
what he observed. When it was running just off the wind, it was much quieter than what the
graph represented. The average wind speed measured on their roof line at 35 feet was
between 7 and 15 miles per hour; at 99 feet it is closer to 9 to 12 miles per hour average with
gusts closer to 18 miles per hour. Pearson asked where Granley heard the turbine run.
Granley stated at the manufacturing facility in Oshkosh, Wisconsin.
Rambacher asked what the wind gust is needed generate 55 miles an hour. Granley
responded 55 miles an hour of wind. The highest wind gusts observed during the wind study
at their roof height was 35 miles per hour. It was asked what the RPMs are in a 55 mile an
hour wind. Granley stated that he could find out. He noted that the sound concerns most
people have are from the larger units, which can go in excess of 100 miles an hour. The
noise that will be heard will not come from unit they are proposing to install; it is the hum
from the generator, which is about 40 decibels.
Ventura asked about the setback requirements for the pole. Granley answered 127 feet,
which is 1.1 times the height.
Rostad re- opened the public hearing.
George Hebaus, 9448 Harkness Avenue, asked if there have there been any studies on if
that hum gets transmitted into the ground as a vibration or is it isolated or dampened.
Granley answered that units consist of a pole and a base that get bolted together on
installation. The unit on the top has special bearing to help it pivot, which reduces the
vibration. The hum that is heard is not a vibration; it is the hum of electricity.
Excerpt from Unapproved Planning Commission Minutes
Werner Electric Wind Turbine —Case Nos. CUP 12-011 &V12-012
March 26, 2012
Page 4 of 7
Brittain asked how the manufacturer turned on the wind turbine for the demonstration.
Granley stated that there is a special unit for demonstration purposes powered by electricity.
Brittain stated that he would expect that the sound would be different from an electrically -
driven unit versus one being driven by the wind. He is concerned about the noise being
cyclically driven by the wind. Granley stated that if the wind was blowing 55 miles an hour,
the wind would be heard, not the blades.
John Magee asked if a setback variance would be required regardless of where the wind
turbine is placed on the property because the property is not large enough to accommodate
the setbacks. McCool stated that was correct.
Magee asked if there is any research on how this type of wind turbine has affected property
values in other areas. Granley responded that they checked with the manufacturer, as that
was asked at the neighborhood meeting, and they did not have anything on that. Magee
stated that he has done some research into wind turbines and because it is new technology,
there is a perception about their impacts. Perception could affect the property value and
sales of properties near a wind tower. Magee asked if Werner Electric is going to sell wind
turbines. Granley responded yes. Magee stated that it is not just for generating electricity; it
is essentially a billboard. He stated that customers would come to the site to see the wind
turbine and maybe purchase one, so essentially it is an advertisement. Granley stated that is
not its primary purpose. He stated that as company they are about clean and green energy,
and they are not installing every unit they sell. Magee commented that a setback variance is
needed so they can make a profit. Granley stated that they do not view this wind turbine as
advertising but as an offset to their building's electricity.
Wehrle asked if the petition is a valid means of expressing concerns. McCool responded
yes, citizens can submit petitions to the City addressing their concerns. Rambacher asked if
the people who spoke signed the petition. The response was yes.
Brittain asked what the requirements would be in a residential neighborhood. McCool
responded that roof - mounted wind turbines would be allowed. Brittain asked what size.
McCool responded a small turbine, which is defined as between 20 and 50 kilowatts with a
maximum height above the structure of 15 feet, which includes the blade height.
Brittain stated that he has researched this topic. He appreciates what an asset Werner
Electric has been to the community. However, some of the published reports documented by
acoustical experts lean towards recommending 30 to 35 decibels to mitigate the cyclical
noise of the turbines. People can get accustomed to a 40 decibel hum from a motor but not
to the variation of wind speeds of a turbine. He is most concerned about changes in sound.
Even slight changes on the decibel scale can be significant on the sound scale. Because the
decibel level is in the 40 to 45 range variations in the amount of sound, he is troubled with
reducing a 1,320 -foot setback to 450. He has significant concerns with the residential area
being that close. This wind turbine would operate all the time and could become a nuisance
to the neighborhood. He does not think it is justified to approve a significant reduction in the
setbacks for the proposed location with the limited knowledge on the impacts of wind
turbines.
Excerpt from Unapproved Planning Commission Minutes
Werner Electric Wind Turbine — Case Nos. CUP12 -011 & V12 -012
March 26, 2012
Page 5 of 7
Reese asked if the 1,320 foot minimum setback requirement for a wind turbine from park
boundaries was also residential boundaries. McCool stated that the setback requirement
from the residential property lines is the 1.1 times the height. The variance is only for the
setback from the Hamlet Park boundary, which is the 1,320 setback. Brittain noted that there
is a larger setback distance from a park that remains empty most of the time than from
residential areas.
Granley stated that staff had asked them to abide by the City's noise control ordinance,
which from 6:00 p.m. to 7:00 a.m., in excess of two hours, is 50 decibels, so they would be
under noise ordinance requirements that would be considered a nuisance.
Pearson asked if the turbine could only be operated during their business hours. Granley
stated that mechanically they cannot lock the unit. Pearson stated that he has seen units that
have been shut down. Granley stated that most units have an overspeed condition, so if it
going too fast, it will slow down or stop. This unit tips down for maintenance, so when the tip -
down procedure is done, there is a way to lock it.
Ventura asked if Werner would be in compliance with the residential setback based on the
1.1 calculation. McCool responded yes, explaining that the variance is for the park setback.
Rambacher commented that the northeast corner seems the most logical location for the
wind turbine. He asked how many employees Werner has and if most live in the Cottage
Grove area. Granley stated about they have about 115 employees and over half the jobs
they have added since they moved to the City have been residents of Cottage Grove.
Rambacher stated his reason for those questions is because expansion in the industrial park
would be good for this community, and selling more turbines, whether it would be helping
Werner save money to bring on more employees, is a warranted cause. He thinks that the
northeast corner makes the most sense to him, and while there would still be park setback
issues, the turbine would be further from the residential properties.
Reese agreed and asked if the northeast corner was where the property falls off into a
drainage area. Granley responded that the first 15 feet of the property is at a steep grade
into the drainage area. Reese asked what needs to be done to make it work near the
drainage area. McCool stated that the City would not want it in the drainage area; the footing
for the monopole would have to be outside the drainage area. Rambacher stated that it
should be 1.1 times the height from the property line. He asked if it would be possible to put
it up in the area where they may expand the parking area in the northeast corner, meeting
the 1.1 setback, and lay asphalt over the footing of the tower. McCool stated that would not
affect drainage. Granley stated that area is used for additional trailer and truck equipment
storage, but safety bollards could be installed around the tower.
Rediske asked about the Werner's time frame for installation. Granley responded that if they
receive approval from the City, they would start excavating when the frost is out of the
ground and hope to have the unit commissioned this summer. It will be a 60 to 90 day
process. Rediske asked if that would still be the timeframe if the Commission recommends
the northeast portion of the site for the tower. Granley stated yes. Rediske noted that if the
Excerpt from Unapproved Planning Commission Minutes
Werner Electric Wind Turbine — Case Nos. CUP12 -011 & V12 -012
March 26, 2012
Page 6 of 7
tower was on the northeast corner, it would help mitigate any problems with flickering from
off -site lighting into neighboring homes.
Reese asked if the northeast corner would work for Werner Electric or would there be
problems due to the truck traffic in that area. Granley responded that they could make that
location work; they would prefer the proposed location where they have no future plans.
Jason Weis asked about birds, noting that the site is two miles from Grey Cloud Island. He
has seen bald eagles in the area. Granley summarized a study that was done through the
Woodland Dunes Nature Center and Preserve, which is a bird migratory path next to a
business that put this exact unit in. Birds flying into the windows on the building were killed at
a rate four to five times higher than birds killed by the wind turbine.
John Kooyman, 6749 Geneva Avenue, commented that 44 of these units have already been
installed. There is a video that shows three units from that manufacturing site running. He
noted that if the turbine is running at normal speed, it is not at 40 decibels; it is comparable
to traffic driving by.
Rostad closed the public hearing.
Messick made a motion approve the conditional use permit to allow a 20 kW wind
turbine on top of a 99 foot monopole on Werner Electric's property as shown on their
site plan and grant a variance from the 1,320 foot setback requirement from public
park or conservation easements to 230 feet, based on the findings of facts and
subject to the conditions listed below. Reese seconded.
Findings of Fact
A. The Wind Energy Conversion System Ordinance (WECS) defines a small wind
turbine as having a total rated capacity less than 50 kW. The wind turbine model
proposed by Werner Electric is a 20 kW unit and only one unit is proposed on their
site.
B. Werner Electric invited neighboring property owners to attend an information
meeting and attending property owners generally supported the applicant's wind
turbine proposal.
C. The monopole height is 99 feet with a rotor diameter of 30 feet.
D. The City's Parks, Recreation and Natural Resources Commission reviewed Werner
Electric's variance application and supported the placement of the wind turbine to
be not less than 230 feet from the Hamlet Park boundary.
E. The proposed location is closest to their main building without impacting their
future plans to expand their facility, parking areas and docking area.
F. The variance is in harmony with the purposes and intent of the Zoning Ordinance.
The property is zoned General Industry and the proposed monopole structure and
Excerpt from Unapproved Planning Commission Minutes
Werner Electric Wind Turbine — Case Nos. CUP12 -011 & V12 -012
March 26, 2012
Page 7 of 7
wind turbine size complies with installation, design and siting regulations required
in the Zoning Ordinance. The requested variance setback from the Hamlet Park
boundary line will not adversely impact the use of this park amenity.
G. The variance request is not specifically addressed in the City's Future Vision 2030
Comprehensive Plan, but its industrial characteristics are consistent the industrial
land use designation for this property.
H. The proposal continues a reasonable use on the property.
I. The unique circumstances to the property were not created by the landowner. The
parcel of land is not large enough to comply with 1,320 foot setback requirement
for the proposed wind turbine.
J. The purpose of the variance is not based exclusively upon a financial hardship.
The proposed wind turbine is an alternative sustainable energy resource that will
reduce their electrical power usage from a private utility company.
K. The granting of the variance should not be detrimental to the public welfare or
injurious to other land in the neighborhood. The proposed wind turbine will not
impair an adequate supply of light and air to adjacent property. It will not create
congestion in the public streets, become a fire danger, or endanger the public's
safety.
Conditions of Approval
1. All applicable permits (i.e., building, electrical, grading, and mechanical) and a
commercial plan review packet must be completed, submitted, and approved by
the City prior to the commencement of any construction activities. Detailed
construction plans must be reviewed and approved by the Building Official and
Fire Marshal.
2. Except for the minimum setback variance for the wind turbine, Werner Electric
must comply with all other City ordinances and policies.
3. Werner Electric must abide by Title 11 -6 -17, Noise Control regulations of the City's
Zoning Ordinance.
4. Lights, reflectors, flashers, or other illumination attached to the wind turbine or
monopole is prohibited unless those devices are required by the Federal Aviation
Administration.
Motion passed on a 7 -to -2 vote (Brittain and Wehrle).
Brittain stated that he explained his opposition to the application during the meeting. Wehrle
explained that if the recommendation had been to move the wind turbine to the northeast
corner, he probably would vote in favor.
Excerpt • the Parks, Recreation and Ilatural Resources Commissil
Meeting on -• 1
B. Werner Electric Wind Turbine Proposal
Dockter introduced Werner Electrics proposal for a 100 foot monopole with a 20 kilowatt wind turbine
mount. The location of the proposed wind turbine is on 95 street and adjacent to Hamlet Park. The
proposal was presented to a Technical Review Committee. City staff that attended discussed the proposal
in regards to how it fits within the zoning requirements which include:
• A conditional use permit.
• Height limitations of 150'.
• A minimum setback from Werner Electric property boundaries of 1.1 times the WECS's height, and
conservation easements of 1,320.
Dockter stated because Hamlet Park property abuts the north and west boundaries of Werner Electric the
1,320 foot setback requirement from public parks does not permit the placement of a free - standing WECS
on Werner Electric's proposed location. Dockter presented an aerial photo of Werner Electric and a letter
from Ben Granley, Director of Operations at Werner Electric. Dockter explained that Werner Electric is
requesting a variance to the proposal allowing for the wind turbine proposal to proceed.
Granley, Director of Operations of Werner Electric, presented a wind energy project packet to the
Commission. Granley stated it was his understanding the setback requirements originated with the Parks
Commission and requested some understanding of why the setback was put into place. Granley explained
some of the precautions Werner Electric took into consideration as they designed this project which
included:
• A pole design versus a lattice design to prevent children from climbing the structure.
• The placement of the turbine in relation to the walking path and drainage ditch.
• The esthetics and what the turbine will look like from the park and neighborhoods.
• The noise and the effect on residents.
• Wind studies that show there is wind generation capable of powering Warner Electric.
• The Environment in relation to how the turbine will affect birds.
• The installation allowing the unit to electronically rise and fall which will allow for easier
maintenance versus climbing the unit.
Granley added the unit is being proposed to offset electricity costs at Werner Electric and is a unit that
Werner Electric sells as part of its clean energy initiative. Granley asked for a recommendation from the
Parks Commission to receive a variance allowing the wind turbine to proceed on schedule.
Granley stated as a part of the process Werner Electric has proactively reached out to the community to
talk to the residents close to the facility to see if they have any concerns regarding the project. Werner
Electric held a meeting and invited the surrounding residents of which 10 residents attended. At the end of
the meeting the residents were asked to take a short survey. The results of that survey showed 8 out of
the 9 residents that participated in the survey had a positive view of Werner Electric and the project. One
resident was opposed to the project with the reason being his objection to any additional noise or truck
traffic.
Granley directed the Commission back to his earlier graph showing noise levels to remain minimal. Kath
asked what the date of the neighborhood meeting was. Granley responded that it was January 26 2012.
Granley added he left contact information on the meeting invitation and he has not had any
correspondence from residents that did not attend the meeting.
A motion was made to accept the variance submitted by Werner Electric. The motion carried.
Burbank clarified this motion would be approving the proposal to go on to the Planning Commission
assuming Werner Electric submitted application by February 29, 2012. Next, the proposal would be
submitted to the City Council at the second meeting in April. This would allow residents additional
opportunities to comment. The Parks Commission would be in support of the application.