1d. Wetland Alteration Permit for Construciton of Storm Water Ponds within 200 ft of a Class A Wetland, City of Chan CITY O.F PC DATE: 2/5/92 /
�� ' CH ANT -IL �ll CC D ATE: 2/24/92
�y . .,,. CASE #: 92-1 WAP
By: Olsen /v
II
1 STAFF REPORT
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PROPOSAL: Wetland Alteration Permit for the Construction of Storm
1 Water Ponds Within 200 Feet of a Class A Wetland
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1 i LOCATION: Three ponds located on the westerly side of Minnewashta
Parkway adjacent to Lake St. Joe
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APPLICANT: City of Chanhassen
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PHYSICAL CHARACTER.:
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II in 2000 LAND USE PLAN:
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Minnewashta Parkway WAP
February 5, 1992
Page 2
PROPOSAL /SUMMARY
The city is in the process of improving Minnewashta Parkway.
Construction is scheduled to begin this spring. The street will be
slightly widened, provided with a sidewalk, have a new solid
roadbed, and incorporate safety improvements.
Included in the improvements is the provision of a storm sewer
system and storm water retention areas. Currently, Minnewashta
Parkway does not have a storm sewer system and untreated runoff
from the street goes directly into Lake St. Joe and Lake
Minnewashta. The storm sewer system will allow for the collection
and pretreatment of storm water prior to it entering Lake St. Joe
and Lake Minnewashta.
There is a total of four storm water ponds being developed as part i
of the storm sewer system. - Three of the most southerly ponds,
Ponds A -C, are located on the west side of Minnewashta Parkway
adjacent to Lake St. Joe. These ponds are being provided to remove
sediments prior to the storm water entering the Class A wetland
adjacent to Lake St. Joe, Lake St. Joe, and eventually entering
Lake Minnewashta. Ponds A and B are located within 200 feet of
the Class A wetland surrounding Lake St. Joe. Pond C is located on
the edge of the Class A wetland with a small portion of the pond
impacting the wetland vegetation. The Zoning Ordinance requires a
wetland alteration permit for any alteration within 200 feet of a
Class A wetland and for any alteration within a wetland. The
fourth pond, Pond D, is not within 200 feet of a Class A wetland,
nor does it impact any wetland area. Therefore, Pond D does not
require a wetland alteration permit. Attached is a memo from the
city's engineering consultant which details the storm water system.
Ponds A and B have been designed to perform NURP functions to 1
effectively remove a large percentage of the sedimentation from the
storm water prior to it entering the wetland and Lake St. Joe.
Proposed conditions are minor due to the level of staff input in
developing the plans. However, we are recommending that the
construction plans be revised to include landscaping around the
structures and ponds to preserve the area's visual quality. The
size and location of the ponds are such that they will not impact
the existing wetland located adjacent to Lake St. Joe. Pond C has
been designed to be a larger pond than Ponds A and B to be even
more effective at removing sediment from the storm water and to
also allow it to take on more of a wetland quality. The design of
the pond is such that the southeast corner of the pond is impacting
a small portion of the edge of cattail vegetation of the Class A
wetland. The proposed new ponding area of Pond C is 5,735 square
feet and the impacted area is 1,355 square feet. Therefore, the
altered area is being fully mitigated.
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Minnewashta Parkway WAP
February 5, 1992
' Page 3
Staff has worked closely with the engineering consultant to have
' the least amount of impact to the existing wetland while allowing
the storm water to be treated prior to entering Lake St. Joe and
Lake Minnewashta. The resulting ponding areas are only impacting
a small area of cattails along Lake St. Joe and the creation of the
' four ponding areas greatly improves the water quality entering Lake
St. Joe and Lake Minnewashta over what exists today.
PLANNING COMMISSION ACTION
The Planning Commission unanimously recommended approval of the
item and added the following condition:
4. The construction of Ponds A -D shall be completed as early in
1 the construction process as is feasible to minimize erosion
and shall be constructed to minimize impact on the adjacent
wetland.
' RECOMMENDATION
Staff recommends the City Council adopt the following motion:
' "The City Council approves Wetland Alteration Permit #92 -1 with the
following conditions:
11 1. Type III erosion control shall be used around the construction
area of Ponds A -D.
2. The city shall receive all permits required from the DNR and
Watershed District.
3. Plans be revised to incorporate landscaping around the ponds
and structures.
' 4. The construction of Ponds A -D shall be completed as early in
the construction process as is feasible to minimize erosion
and shall be constructed to minimize impact on the adjacent
wetland."
ATTACHMENTS
1. Memo from William Engelhardt and Associates - Details of the
storm water system.
2. Ponds A -D.
3. Planning Commission minutes dated February 5, 199
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MINNEWASHTA PARKWAY STORM WATER MANAGEMENT SYSTEM 1
INTRODUCTION:
As the storm sewer system for Minnewashta Parkway was being
designed, careful consideration was given to both minimizing
the environmental effects of planned construction and
mitigation of the environmentally detrimental
characteristics of the existing developed system. 1
Preliminary discussions with both the DNR and MCWD added to
the scope of the system and contributed significantly to the
final system design. The system evolving from the planning
and scoping process was designed in the spirit of improving
the water quality of three important water bodies: Lake St.
Joe, Lake Minnewashta, and Lake Virginia.
OVERALL MANAGEMENT PLAN: 1
As previously stated, the overall plan was to incorporate 1
various mechanisms by which the effect of Minnewashta
Parkway and adjacent development on Lake St. Joe, Lake
Minnewashta and Lake Virginia will be minimized. Since the
natural flow of water in this chain of lakes is from St. Joe
to Minnewashta to Virginia, it was decided to discharge the
storm sewer into Lake St. Joe where possible. In fact, four
of the six storm sewer lines discharge into St. Joe. The 1
remaining two lines discharge into the creek connecting
Minnewashta to Virginia. There are no direct discharge 1
locations into Minnewashta. Rather than discharging
directly to the receiving waters, sedimentation ponds will
be constructed at five of the six discharge points. In
addition, the final structure in each line will be a sump
structure. This structure will trap coarse sediments prior
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1 to discharge into the sedimentation pond. As an added
treatment mechanism, runoff from development along West 77th
1 Street, Minnewashta Highlands, Maple Shores Drive, Red Cedar
Point, Stratford Lane, Stratford Ridge, Glendale Drive, and
Linden Circle will be conveyed to the treatment ponds by
storm sewer. Further, the existing discharge into
Minnewashta via the Stratford Ridge detention pond will be
' removed thus eliminating the existing erosion problem. The
final treatment mechanism underlying all the aforementioned
is the installation of concrete curb and gutter on
Minnewashta Parkway. This allows runoff to be routed to the
1 ponds. In contrast, existing street runoff sheets directly
into St. Joe and Minnewashta.
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DESCRIPTION OF TREATMENT PROCESS:
The following narrative describes the method by which the
ponds will improve the quality of the storm runoff entering
the receiving waters. First, the storm water enters the
1 storm-sewer line and eventually arrives at the sump
structure. At this point, the larger gravel and rock
' sediments transported, in the line, settle to the bottom of
the structure. Upon discharge into the sedimentation pond,
the finer gravel particles and flocculated clays and silts
will settle from the water. At this point, the water passes
through a skimmer structure and into a pipe discharging into
1 the receiving waters. The skimmer structure is designed to
prevent oils and other floatables from entering the
receiving waters.
The mechanism of a settle - pond is simply gravity settling of
an object in a fluid media. The pond itself can be
envisioned as a bulge in the pipe. As water enters the
bulge, the area of flow increases. As the area increases,
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the flow velocity decreases. This decrease in flow velocity 1
provides the time necessary for a particle to settle to the
bottom of the pond and hence, be removed. Combined with the 1
outlet skimmer, the pond becomes an efficient means by which
to control the sediment and petroleum product load on the
receiving water. Removal of these constituents of storm
runoff reduces the Biological Oxygen Demand (BOD), nutrient
load and organic load transferred to the receiving waters.
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WETLAND ALTERATION:
Based on the latest survey information, the only pond
requiring alteration of a wetland is Pond C. Construction 1
of Pond C will include placing embankment on 1,355 square
feet of the wetland adjacent to Lake St. Joe. To compensate
for the loss of wetland, there is an area of excavation of
5,375 square feet below the OHW of Lake St. Joe.
In addition, it should be noted, while the ponds encroach
upon wetlands, the nature of the pond will improve the water 1
quality received by St. Joe. This reason, coupled with the
difficulty of constructing an adequate storm sewer system 1
should be considered when reviewing the overall
environmental impact of this project. 1
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I PREPARED BY
I WILLIAM R. ENGELHARDT ASSOCIATES, INC.
CONSULTING ENGINEERS
1107 HAZELTINE BLVD., SUITE 480
1 • CHASKA, MINNESOTA 55318
(612) 448 -8838
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PREPARED BY:
WILLIAM R. ENGELHARDT ASSOCIATES, INC.
CONSULTING ENGINEERS
1107 HAZELTINE BLVD., SUITE 480
CHASKA, MINNESOTA 55318
(612) 448 -8838
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PREPARED BY=
1 WILLIAM R. ENGELHARDT ASSOCIATES. INC.
CONSULTING ENGINEERS
1107 HAZELTINE BLVD., SUITE 480
I . CHASKA, MINNESOTA 55318
(612) 448 -8838
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PREPARED BY=
WILLIAM R. ENGELHARDT ASSOCIATES, INC. 1
CONSULTING ENGINEERS
1107 HAZELT I NE BLVD., SUITE 480 •
CHASKA, MINNESOTA 55318 1
(612) 448 -8838
1
CHANHASSEN PLANNING COMMISSION
REGULAR MEETING
11 FEBRUARY 5, 1992
Chairman Emmings called the meeting to order at 7:30 p.m..
' MEMBERS PRESENT: Tim Erhart, Ladd Conrad, Matt Ledvina, Steve Emmings,
Brian Batzli, Jeff Farmakes and Joan Ahrens
STAFF PRESENT: Paul Krauss, Planning Director; Jo Ann Olsen, Senior
Planner; Kate Aanenson, Planner II; Sharmin Al -Jaff, Planner I; and Charles
Folch, City Engineer
' ORGANIZATIONAL ITEMS: ELECTION OF CHAIR AND VICE -CHAIR FOR 1992.
Emmings: I'm going to make some nominations myself. Right out of the box
I want to nominate Brian Batzli for Chair and I'm going to nominate Joan
Ahrens for Vice -Chair for the next year. Are there any other nominations
for either position? How do we handle this? Do we need a second or just
go ahead?
Conrad: Not on a nomination.
i Emmings: Okay. Tim, I'm going to bring you up to speed real quick.
Brian's been nominated for Chair for the coming year and Joan's been
' nominated for Vice Chair. The message came to us thq't you were not
interested.
Erhart: I've taken the Chairmanship of the Storm Water Utility. That's
going to keep me real busy for the next year.
Emmings: I think that's kind of a weak excuse.
Erhart: That's what Paul said too. 5o I would like to concentrate on
that. I think it's great.
Emmings: Okay, we'll close the nominations. If there are any more.
Chairman Emmings nominated Brian Batzli as Chairman and Joan Ahrens as
11 Vice - Chairman of the Planning Commission for 1992. All voted in favor and
the motion carried.
PUBLIC HEARING:
WETLAND ALTERATION PERMIT FOR THE REALIGNMENT OF MINNEWASHTA PARKWAY AND
THE MITIGATION OF APPROXIMATELY .76 ACRES OF WETLAND. CITY OF CHANHASSEN,
ENGELHARDT AND ASSOCIATES.
Public Present:
NAME ADDRESS
Barney Leach 3830 Red Cedar Point
Jim Hoefer 7098 Red Cedar Cove
Jo Ann Olsen presented the staff report on this item. Chairman Emmings
called the public hearing to order.
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Planning CommisPion Meeting 11
February 5, 199, - Page 2
Barney Leach: My name is Barney Leach I'm at 3830 Red Cedar Point Drive.
Or Road they tell me. I have a question. I had a question from Mr. Connor,
that lives on the of Red Cedar Point Road and Minnewashta Parkway.
He is in Texas right now for-the winter and because of a heart operation
he's in poor health but he's down there. He's called me twice. He's
concerned about this holding pond that they're building across the road
from his property and he says he's paying taxes on that land and wondering
if they're going to put a holding pond in there, • is that on the access
property or is it on his land?
Olsen: Do you know which one it is Charles?' It's not on the access
property. '
Folch: Pond B is going to be awfully close to that original access...
Barney Leach: If it goes in the northerly direction it's going to be in II
his property. His concern was if they're going to do that, he wants it
removed from the tax roll. That was all.
Olsen: Yeah, we're acquiring easements.
Folch: ...any areas which are constructing these facilities outside of our,
.existing right -of- way...
Barney Leach: Yeah, okay. We're going to be going down to see him and I
. wanted to give a report kind of to calm him down a bit because he's kind o
upset so.
Folch: It'd be good for us to know an address on how to contact him. '
Barney Leach: Oh boy. He's in El Paso, Texas but I don't know.
Emmings: Maybe you could ask him to contact the City for any details and II
if it is on his property, they may want to negotiate with him to get the
easements.
Barney Leach: If it's to the right as you're facing the lake, if it's to
the right of that access, it's his land.
Emmings: There aren't any lot lines out there that you can see so saying II
it's to the right probably isn't going to get us too far. Okay. Again
this is a public hearing. Does anybody else have any comments on this
proposal?
I have a question about Pond C.
Emmings: Would you come up and state your name please.
Jim Hoefer: My name is Jim Hoefer, 7098 Red Cedar Cove. Where is that in I
relation to King's Road?
Olsen: Just directly south. Probably about 100 feet south or so.
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Planning Commission Meeting
February 5, 1992 - Page 3
Jim Hoefer: In that area is a, I'm not sure what it is. Some sort of
electrical box. Phone connection or something.
Olsen: A utility. Yeah, there's like a utility station there.
Jim Hoefer: Will that have to be moved?
Olsen: No, it will be south of that. •
' Emmings: That's quite close to King's Road as I recall.
Jim Hoefer: Thank you.
i Emmings: Any other public comments? Comments from neighbors? Is there a
motion to close the public hearing?
' Batzli moved, Conrad seconded to close the public hearing. All voted in
favor and the motion carried. The public hearing was closed.
' Emmings: Comments. Any comments up here? Joan?
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Ahrens: I hate to go out of order here but I'd like to hear from our
resident environmental guy... •
' Emmings: Before you say anything?
Ahrens: Right.
Emmings: Because you might want to change what you're going to say?
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Ahrens: No. Because I'm interested to hear what he says...
Ledvina: I did have a few questions for the staff on these wetlands.
Wetland alteration. I was wondering first of all, when is the construction
proposed?
Folch: We hope to let the contract for the project by late April -early May
of this year and we'd like to complete... Try and get all of the storm
drainage improvements including the pond and the road surface, curb and
gutter and the blacktop this year... It's a rather agressive construction
schedule but that's what we're going to have to do.
• Ledvina: Will the ponds be constructed before the other areas are
disturbed in terms of the road, the existing roadbed and such? How do the
ponds fit into the construction schedule?
Folch: The ponds will fit in and will be constructed at the same time as
the storm sewer system is put in. So that once you have a collection point
basically functioning... There is likely to be additional grading that
will go on prior to storm sewer construction and we'll have to mitigate any
potential erosion with erosion control' at that point.
Ledvina: This seems to be kind of a skeleton of a description of the
' activities. I was wondering what the specific provisions were for the
Planr*ng Commission Meeting
February 5, 1992 - Page 4
maintenance and the cleaning of the ponds to maintain the removal
efficiencies and such.
Folch: At current status or current point in time we do not have an
established maintenance program or schedule if you will for-maintaining the
City's retention ponds. Typically what's happened in the past is once II we've seen a pond or take notice that it's silted up or it's having some
problems functioning properly, then we go in and we take care of that. The
maintenance program is something, is one area that is going to be generate
derived out of this new surface water management program that we're
currently undertaking. And that will involve not only maintaining the
ponds on a regular basis but also frequent street sweeping and such also.
Ledvina: So that's something'to be developed in the future?
Folch: That's correct. i
Ledvina: And it will be developed.
Folch: Within the next 12 months. 1
Ledvina: Okay. And then the drawings that I have didn't show erosion
protection for the outlets. You do state that there'..s Type III erosion and"
I don't know specifically what that is.
Folch: There should be a detail in the, the standard detail sheets in the!'
front of the project plans which basically shows the Type III erosion
control which basically consists of your silt fence, a layer of the snow
fence and then the hay bales behind that.
Ledvina: Okay. And that will be used for the outlets as well?
Folch: Initially until we can get the vegetation established. 1
Ledvina: And there's no need for like a rip rap or erosion control based
on the flows, etc.?
Folch: Exactly. All of the outlet structures are being designed to
release the water for the design storm at half a foot per second which is
basically the minimum to try and prevent or mitigate any potential erosion.,
Ledvina: Okay, thank you. •
Emmings: Those are basically the questions you were going to ask. '
Ahrens: That's right... I did have a couple questions on...Minnewashta
Parkway storm water management project. Of the wetland alteration. What
is the, that first paragraph....
Olsen: That's...
Ahrens: You're going to excavate, okay.
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Planning Commission Meeting
February 5, 1992 - Page 5
Folch: That's actually going to be the area for the detention pond and
that Pond C will be set up in such a way so that it will upon revegetating
will take on wetland characteristics.
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Ahrens: The cattails will grow back?
Folch: Exactly. So basically what we're trying to show there is that
we're encroaching on a pond about 1,400 I guess it is square feet of
existing wetland but we'll be creating via the detention pond about 5,000
so there's actually a plus creation of wetland area.
Ahrens: You don't have easements yet...?
Folch: No. We are currently in the process of putting the easement
documents together and I would expect over the next 2 to 3 weeks we would
go through the process of trying to acquire the easements.
Ahrens: What if you can't get them...
Folch: We hope that the process•will go smoothly but if it becomes
difficult, we'll have to take those measures.
I Ahrens: You talked about doing landscaping around the pond...
Folch: Basically in working with the planning department on this wetland
alteration permit, they had made a rather good suggestion as to providing
some sort of landscaping of vegetation plantings around these detention
ponds so they don't look like these rough man made structures out here in a
natural environment. And so we're going to work with them. We don't
' officially have a landscape plan but we will work with them in putting in
shrubs and other plantings that will help to disguise or camouflage the
pond itself but we also will do it in such a way that we can maintain
access to get in and clean out the pond.
Ahrens: So the structures just mean the ponds?
Olsen: The ponds and there are outlets but it's all going to look pretty
much natural.
Ahrens: I don't have anything else.
Emmings: Okay, thanks Joan. Jeff.
Farmakes: We had a gentleman come up here. Are there are any other
property owners, the other two property owners or are there more than two
that contacted you at all?
Olsen: No. I had one other person who lives along the road that was just
interested in what was going on but.
r Farmakes: Were they a property owner? I have no other questions.
Batzli: Normally we do this in accordance with a staff report or plans or
something. We obviously didn't get the full detail set of plans but are
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Planning Commission Mee 1
February 5, 1992 - Page 6
there a set of P lans that this will be done in accordance with?
Folch: That's correct. The reason we didn't pass out a set of plans,
there's about 45 sheets to the plan set but there is a copy that we have II
sitting out in the engineering department for anyone, residents or anyone
who's interested in coming in and seeing the plans so feel free to come in I
and take a look at them if you would like.
Batzli: Are they dated stamped received like a normal set of plans would
be?
Folch: That's correct, they are.
Batzli: What's the date on them? 1
Folch: These actually, the copy that I have actually was a working copy. I1
gave my set out to my street superintendent to take a look at so I don't
actually have an official copy but this plan set here was prepared about 2
weeks after the first of the year.
Olsen: We can get that date.
Batzli: And when you say that this is going to hopefully aggressively go II
through the whole year, obviously we're encroaching on wetlands and where II
the part, the wetlands we're actually altering is fairly small but is there
a particular time of year that it would be better to do some of this
construction?
Folch: Actually winter construction, this time of year would actually be
probably the least disturbance to the wetlands. Unfortunately in the
project process here we're not ready to let a contract at this point in
time and it just wouldn't be feasible to start and do one this year. It
also wouldn't be feasible to hold the project off or at least that portion I
of the work until next winter either. It's something that we'll have to
deal with. It's often done and as long as the work is accomplished, we're
taking great care into maintaining erosion control and protection of these
water bodies, it can be done. But winter time is typically the least
disturbance time.
Batzli: That's all I have. 1
Emmings: Okay. Do you have anything additional Matt?
Ledvina: Yeah, I think as far as the conditions that are listed with the 1
recommendations, I would also like to add a condition that the ponds be
constructed as early as feasible in the overall scheme for the roadway
upgrading. I think if you have the ponds in place, they can function for I
sedimentation control as the construction is being carried out so I think
that's important, if that can be phased as such. •
Emmings: Is that kind of a condition.pose any problems? 1
Folch: Well actually I guess I can't say at this point in time. We are
sort of going to leave the issue open to the contractor to determine how he
1
Planning Commission Meeting
February 5, 1992 - Page 7
11 4
best wants to stage and phase the construction of the project. As I
mentioned before, we would construct the ponds in conjunction with the
storm sewer. So the storm sewer system would be set up and outletting
directly into these water bodies without having the detention ponds in
place. Having the ponds in without the storm sewer probably still isn't
' going, you're not going to have much benefit from that standpoint until you
are able to get the boulevard and areas draining into the street into the
curb and gutter and then collected by the storm sewer system into the pond.
So as soon as the storm sewer improvements are being conducted, the pond
will be constructed at the same time.
Ledvina: And that's the normal sequence of construction?
Folch: With this type of project where basically there's no sewer and
water improvements being done, the first utility work to be done is the
storm sewer.
Ledvina: Okay. So that's the natural course of events anyway?
Folch: But the contractor may do the road improvement in phases. He may
split the whole entire road segment into two phases or three phases but as
he's doing each phase the storm sewer part will be the first part of the
improvement.
Ahrens: May I ask one more question? Do you have a time line for getting
the easements?
Folch: Yeah, actually we'd like to have the easements in place before we
let the contract.
Ahrens: When do you think you'll get those out?
Folch: Get the easements out? We should be out over the next 2 weeks
acquiring those easements.
Emmings: Ladd.
Conrad: Charles, does all the water from the new street will drain into
this system?
Folch: That's correct.
Conrad: To Ann, have we upheld all the guidelines and standards on this
project that we'd apply to a private contractor?
Olsen: Yeah, we've tried to do that. I mean we require them to do that.
11 The areas, like Pond A and B don't have a real large area to get the
creative wetland areas that we'd like to do when we have more room but they
are meeting the standards of ponding prior to it entering the wetland and
that's what we were really trying to achieve.
Conrad: In wetland C, sometimes we u the DNR standards. They have sta Bards. T ey h e 5
points in terms of.
Planning Commission Meeting
February 5, 1992 - Page 8
1.
Olsen: The Fish and Wildlife standards?
Conrad: Yeah. 1
Olsen: We are doing that with that one and we do have more room to work
with it. It has been designed for that. '
Conrad: It has been?
Olsen: The other two, no. 1
Conrad: Basically a net benefit to the lake.
Olsen: Right.
Conrad: That's all. 1
Erhart: I don't have anything.
Emmings: I don't have anything further. 1
Batzli: I move the Planning Commission recommends approval of Wetland
Alteration Permit #92 -1 in accordance with the staff.yeport dated January II
29, 1992 and the plans dated received whenever they were received with the
following conditions. 1, 2, and 3 as set forth in the staff report and a
fourth condition to read the construction of the ponds A thru D shall be
completed as early in the construction process as is feasible to minimize
erosion and shall be constructed to minimize impact on the adjacent
wetland.
Emmings: Is there a second?
Conrad: I'll second that. 1
Batzli moved, Conrad seconded that the Planning Commission recommend
approval of Wetland Alteration permit #92 -1 in accordance with the staff
report dated January 29, 1992 with the following conditions: . '
1. Type III erosion control shall be used around the construction area of
Ponds A -D. 1
2. The City shall receive all permits required from the DNR and Watershed
District. 1
3. Plans be revised to incorporate landscaping around the ponds and
structures.
4. The construction of the Ponds A -D shall be completed as early in the
construction process as is feasible to minimize erosion . and - shall be
constructed to minimize impact on the adjacent wetland. 1
All voted in favor and the motion carried unanimously.
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