01/10/1991 - Advisory Parks & Recreation Commission
JUST A REMINDER
THE RECREATION SUBCOMMITTEE WILL MEET
AT 6:00 P.M. PRIOR TO THE
BEGINNING OF THE COMMISSION MEETING
LOOKING FORWARD TO SEEING YOU!
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MEMORANDUM
TO: ADVISORY PARKS AND RECREATION COMMISSION
FROM: KEN VRAA, DIRECTOR OF PARKS AND RECREATION
DATE: JANUARY 3, 1991
RE: JANUARY 10 CON04 SSION MEETING
Happy New Year!
This year's first agenda is relatively light. The first item for the agenda is recognition of the
Park Rangers. As you are aware, the Park Ranger Program recently was recognized by the
Minnesota Parks and Recreation Association when the Department was presented with the
Citation Award. The Department also received recognition from the Minnesota Parks
Supervisors Association for this same program. These awards were presented to the City
at the December 18th City Council meeting and we felt it appropriate that the Rangers also
receive recognition from the Advisory Parks and Recreation Commission.
There are no items on the Consent Agenda and only one item under Development Proposal.
The Commission, at it's December meeting, requested that the Diffley Commons item be
returned to the Commission for review. At the City Council meeting on December 18, the
Council took action to refer the item back to the Commission. Staff has prepared a
separate memorandum concerning this item and a representative of Diffley Commons will
be present at the Commission meeting to review changes in the plat which meet the open
space requirements.
Old Business
Highline Grading is the first issue here. Staff has prepared a brief memorandum outlining
this item. Commission members should be aware that the new developer and owner of this
subdivision has taken a very positive attitude in meeting with Staff and is looking forward
to taking corrective action.
The naming of Wellsite Park is the second item under Old Business. The Commission
previously approved recommendations for the old Willmus and Coventry Pass Parks but
deferred naming of the Well Site Park awaiting further suggestions. Staff has provided you
with a memorandum with some possibilities. Staff is also aware that at least one of the
Commission members has a name suggestion to add to this list.
Advisory Parks and Recreation Commission
January 10, 1991 Commission Meeting
Page 2
There are no items under New Business and only one item under Water Quality. Mr. Rich
Brasch will update the Advisory Commission on the lake assessment study that was
performed on Thomas Lake Park. This will be a brief verbal discussion.
Parks Development
Staff will update the Advisory Commission on parks projects and also report to you on the
meeting on Blackhawk Park. An extensive memorandum is contained within the packet
concerning Blackhawk Park. This memorandum is self-explanatory.
Other Business and Reports
There are several items under Other Business and Reports including the Department
Happenings and an update on the Winter Weekend; also a request by Commission Member
John Griggs for a proposal for classical music to be performed in a concert setting. Time
permitting, we will also have the round table of the Advisory Commission followed by
adjournment.
Members should be aware that the February meeting of the Commission will be devoted to
organizational business of the Commission in which a Chairperson is elected by the
Commission Members as well as appointments to the various sub-committees.
Respectful.)/r' ub ted,
Ken Vraa
Director of Parks and Recreation
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AGENDA
ADVISORY PARKS AND RECREATION COMMISSION
EAGAN, MINNESOTA
Thursday, January 10, 1991
7:00 P.M.
Eagan Municipal Center
A. 7:00 P.M. Regular Meeting - Eagan Municipal Center
B. Call to Order and Pledge of Allegiance
C. Recognition of Explorer Program
D. Approval of Agenda
E. Approval of Minutes of Regular Meeting of December 6, 1990
F. Consent Agenda
G. Development Proposals
(1) Diffley Commons
H. Old Business
(1) Highline Grading
(2) Well Site Park Naming
1. New Business
J. Water Quality
(1) Lake Assessment
K. Parks Development
(1) Update
(2) Blackhawk Park
L. Other Business and Reports
(1) Department Happenings
(2) Winter Weekend
(3) Proposal for Classical Music Concert
(3) Round Table
M. Adjournment
I
Subject to Approval
M24UTES OF A REGULAR MEETING OF
THE ADVISORY PARKS AND RECREATION COMMISSION
EAGAN, MINNESOTA
DECEMBER 6, 1990
A regular meeting of the Advisory Parks and Recreation Commission was called to order at 7:00 P.M.
on Thursday, December 6, 1990 with the following Commission Members present: Ted Billy, George Kubik,
John Griggs, Shawn Hunter, Dick Carroll and Lee Markell. Commission Members Michele Swanson and Jack
Johnson were not present. Staff present included Ken Vraa, Director of Parks and Recreation; Stephen
Sullivan, Landscape Architect/Parks Planner; Dorothy Peterson, Recreation Supervisor; John VonDeLinde,
Parks Superintendent; Rich Brasch, Water Quality Coordinator and Cherryl Mesko, Secretary.
AGENDA
John Griggs moved, Ted Billy seconded with all members voting in favor to accept the agenda as
presented.
MINUTES OF REGULAR MEETING OF NOVEMBER 1, 1990
Dick Carroll moved, Shawn Hunter seconded with all members voting in favor to accept the minutes
as presented.
CONSENT AGENDA
There were no consent agenda items for the Commission to review.
HOEFT ADDITION
Stephen Sullivan explained that the subject parcel is located south of Highway #55 and north of Bur
Oaks Park. The lineal property (135' wide x 2643' long) is difficult to develop as an R-4 parcel therefore this
proposal is for the incorporation of the parcel into four adjacent single family lots. The City attorney has
interpreted that platted lots which are being replatted and have not previously paid park of trail dedications
can be subject to these obligations therefore, these four lots would be subject to a cash trails and park
dedication. Mr. Sullivan continued that this issue has come before the City Council and the Council has
decided to waive the fees.
George Kubik stated that this particular development was a departure from standard procedure. Dick
Carroll commented that since the City Council had already taken action to waive the fees the issue is resolved.
Mr. Carroll continued that the Commission agrees with Council's action noting that this instance is an
exception rather than the standard.
After further discussion, Shawn Hunter moved that the Advisory Parks and Recreation Commission
adhered to the City Council's recommendation to waive parkland and trailway dedication fees for Hoeft
Addition but that this action is an exception to the Commission's standard recommendation. Ted Billy
seconded the motion with all members voting in favor.
ADVISORY PARKS AND RECREATION COMMISSION
MINUTES OF DECEMBER 6, 1990 MEETING
PAGE 2
DIFFLEY COMMONS
Ken Vraa explained that this parcel is a component of the Eagan Hills West Planned Development.
The Planned Development originally contained 385 acres of which approximately 75% is platted. The subject
property is located north of County Road #30, east of Rahn Road and west of Blackhawk Road. The items
the Commission will need to review include what is the parks dedication, what is the trails dedication and does
the proposal meet the recreational open space guidelines.
The largest issue for the Commission to review involves the recreational open space requirement. The
City Code requirement states that each multiple dwelling complex shall have a minimum recreation area equal
to 200 square feet for each dwelling unit containing 2 or less bedrooms and 100 additional square feet fore
each dwelling unit containing more than 2 bedrooms. Recreation area also needs to be a minimum of 100
feet from any ponding area.
The development of this parcel, Rottland Homes, would like to provide several small areas rather than
one large open space area. Steve Sullivan commented that he is comfortable working with this option.
Ken provided some history regarding this site and the trails dedication issue. Since this was originally
Eagan Hills West PUD it encompassed an area from Cliff to Rahn to Diffley as well as an area north of
Diffley. Originally they were to provide parkland (known now as Meadowlands) and park of the Highline trail
and a trailway north to an open play area. In comparing what was expected versus what was given this
development will, upon development completion, be short 3.2 acres on the overall PUD. When the site is
completely developed the developer will not be able to provide the required 5.67 acres of passive park,
therefore, they will be responsible for a cash equivalent of the 5.67 acres plus the net shortage of 3.42 acres
from the overall development which equates to approximately $60,000. Staff has met with the developer and
they are comfortable with the calculations that staff has provided.
George Kubik commented that in the past even though children have not been projected as being a
large number in a development it has happened that there have been more children then estimated resulting
in the need for developers to provide the required open space. Shawn Hunter commented that an open space
area is more environmentally sound and noted that the open space is not only for the people within the
development but for the aesthetics of the community.
George asked what the developers response was to the request for an update at the December meeting
regarding the developer's proposal for concurrence of the open recreation space ordinance. Steve Sullivan
noted that the information was requested of Sienna Corporation however, they have dropped the project and
Rottland Homes has taken it over. Rottland has expressed a willingness to work with the City on this issue,
but were unable to respond by the December meeting. They will, however, come back to the Commission in
January if they so desire or will work with staff to resolve this issue.
After further discussion John Griggs moved, Dick Carroll seconded with all members voting in favor
to ask that the developer come back to the Commission in January, 1991 with a couple of plans which include
open green space in the development for the Commission to respond to.
ADVISORY PARKS AND RECREATION COMMISSION
MINUTES OF DECEMBER 6, 1990 MEETING
PAGE 3
CARLSON LAKE PARK UPDATE
Stephen Sullivan explained that staff met with five neighbors who had agreed to participate with the
landscape plan for Carlson Lake Park. The first informational meeting brought the following
recommendations from the landscape committee: incorporation of native plant materials; variety of coloring
and fruiting plant materials; development of lowland and upland forest association and when possible, plant
materials to provide a noise buffer adjacent to residential lots. Landscape Architect Craig Johnson provided
a landscape plan for the committee to respond to. The committee adopted the plan as presented. Mr.
Sullivan explained the committee has requested that the planting be done at one time next spring. It was
determined that the plantings could be completed in the spring of 1991, however it will depend upon the
availability of plantings being designated at this site along with manpower available to complete the task.
Steve continued that staff has worked through this situation and feels the neighborhood is satisfied with the
results.
Shawn Hunter asked if it would be more expensive to do this work in a single phase rather than
spreading it out. Mr. Vraa responded that may not be the case especially if all the plantings and manpower
were available to do the job in one shot. John Griggs asked what the trunk diameter would be for the
replacement trees. Mr. Sullivan responded that the bare root types would be one inch diameter whereas the
bald and burlap type would be 4 inches in diameter. Steve noted that the committee preferred quantity versus
size. John Griggs then asked what the projected cost for the project would be to which Steve Sullivan
responded under $10,000.
MGHLINE GRADING
Stephen Sullivan reminded the Commission of their review of this issue at an earlier meeting. Since
that time Steve and John Wingard (Engineering) have been trying to work with Tri-Land to resolve the
drainage problems that exist.
One of the scenarios that has been proposed is for a pipe to be installed to a catch basin to the west
of the property. This proposal would decrease the erosion problem and mitigate the damage. A second
scenario is for the overland flow which would allow for a holding area that would follow a swale and end up
in Trapp Farm Park. Tri-Land wants to evaluate the overflow scenario more closely. They feel a four foot
wide swale outletting over the hill would work but needs to be more finely tuned. Steve explained that the
Commission needs to evaluate whether or not Trapp Farm Park should be used in this fashion. Tri-Land
wants to grade yet this year and staff is seeking direction from the Commission.
Shawn Hunter asked if the swale was going to be concrete. Mr. Sullivan responded that there would
be a berm 3 feet high with a 3:1 slope to a 4 foot wide swale. A trail pad would then be graded along the
disturbed area. John Griggs asked if the underground pipe were required, how would this installation be
financed. Mr. Sullivan stated that was unknown at this time.
Lee Markell commented that the cut through this area is very large. He reiterated that the cut was
done on Monday, October Sth when City offices were closed and there were no staff available to give the
authorization for grading on this park property. He continued that the cut is a 400 foot stretch from the
natural ravine approximately 6 feet wide and 3 feet deep. The intention of the unauthorized grading was to
alleviate a drainage problem that exists on a lot within this development.
ADVISORY PARKS AND RECREATION COMMISSION
MINUTES OF DECEMBER 6, 1990 MEETING
PAGE 4
Shawn Hunter stated the since the grading was unauthorized the developer should be made to fill in
and sod over the cut that has been made as well as pay for the cost of underground pipe. Steve Sullivan
explained that even though the cut may be filled in there is still a drainage problem that Engineering is
working to resolve. Dick Carroll asked what Engineering's recommendation was. Steve responded that they
felt as long as an overland system can work effectively this would be their preference because of the cost
effectiveness.
Lee Markell explained that the biggest problem is that there are 3-4 acres that drain south from
Livingston regardless of what happens to the north. He continued that even if all the water is diverted north
of this property the watershed to the south of Livingston will always be a problem. The drainage between the
two homes in question will continue to be a problem unless this is addressed more completely.
George Kubik questioned why the parks are again responsible for absorbing hydrologic planning
mistakes again. Lee Markell stated that the problem existed two years ago and the developer was going to
drain the lots on the north side of the Highline corridor to the north however this resulted in extreme erosion
problems.
John Griggs stated he was most concerned for the neighbors on the bottom of the hill that are dealing
with this erosion problem. He commented that if Public Works feels the overland scenario would be the most
workable the Parks Department should work to make that happen. George Kubik agreed that this is an
option that needs to be considered however mitigation for the damage to the Highline Corridor needs to be
considered as well. Dick Carroll suggested that perhaps that developer could provide a trailway connecting
Walnut Hill Park to Trapp Farm Park. John Griggs asked if a special meeting would need to be called to
pursue the issue of mitigation. Ken Vraa stated there was concern for the colder temperatures and frost
settling in the ground.
Lee Markell commented that it appears that it is too late for anything to be done this year. Steve
Sullivan noted that the developer would start within the next two weeks if an agreement could be reached on
what was to be done. Mr. Markell suggested that the grades be shot near the two homes that receive the brunt
of the drainage problem to see what options can be considered to remedy their problem.
After further discussion George Kubik moved, Shawn Hunter seconded with all members voting in
favor to have the developer restore the Highline Corridor property to pre-existing conditions and that the
developer take no further action at this time. Staff is to meet to determine the best options for this site and
a special session will be called for the Commission to review alternatives for this site.
For the record, George Kubik wanted to know what compensatory measures would be taken to
mitigate the damage done to park property.
PARK NAMING
Dick Carroll noted that the Park Naming sub-committee had met on November 16 and came up with
several proposed park names for what is now known as Coventry Addition Park, Willmus Addition Park and
Well Site Park. Mr. Carroll recapped the extensive history background of each park and commented that the
sub-committee recommended the following possible names: Coventry Park - Captain Dodd, Hickory Hill and
Hidden Pond; Willmus Park - Downing Park, Blackstrap; Well Site - Moccasin Park, Traverse Park.
O.
ADVISORY PARKS AND RECREATION COMMISSION
MINUTES OF DECEMBER 6, 1990 MEETING
PAGE 5
After considerable discussion George Kubik moved to recommend to the City Council that Coventry
Park be named Captain Dodd Park; that Willmus Park be named Downing Park and that the naming of Well
Site Park be tabled until the January, 1991 meeting since a consensus could not be reached on a
recommendation. Further discussion resulted in a vote for the name "Captain Dodd Park" versus "Captain
William Dodd Park". Three members voted to keep the name "Captain Dodd Park", two voted to change it
to "Captain William Dodd Park" and one member abstained, therefore the name "Captain Dodd Park" stood
as the recommendation. Dick Carroll seconded the motion with all members voting in favor.
PARK DEDICATION FEE REVIEW
Director Vraa reviewed the park dedication fee history from 1986 to the present for the Commission
noting what the fees have been over that time frame. Mr. Vraa also provided the members with comparisons
of other community's fees noting that there has been some softening in the residential/commercial property
in the last several months resulting in the possible slow down in property valuations. Staffs recommendation
is that the trail dedication and the commercial/industrial rates should not be changed for 1991. In regards to
residential development, staff suggested a 24% increase however each living unit should be considered very
carefully by the Commission. Ken reminded the members that it is the land value that is set, not the unit
value; adjustments to the unit value are based on land value.
After further discussion, Dick Carroll moved that there be a 3% increase in single family increasing
the average market value to $16,480 and that all other rates remain the same as in 1990. There was no second
to the motion.
George Kubik moved that there be a 3.5% increase in the average market value with no increase in
the commercial/industrial portion of the park dedication fee for 1991. Ted Billy seconded the motion with
all members voting in favor.
Mr. Kubik continued that no change would be recommended in the trail dedication policy at this time
but that it would be reviewed at the end of 1991.
FEE SCHEDULE REVIEW
Director Vraa explained that Recreation Supervisor Dorothy Peterson had prepared the memo in the
packet regarding the proposed fee structure for 1991. They noted that in some instances fees had not changed
for more than ten years. Dorothy also commented that the Department's fees are generally in the mid to low
range compared to other communities.
After further discussion, John Griggs move, Ted Billy seconded with all members voting in favor to
accept the 1991 fee schedule as presented.
George Kubik thanked Dorothy for the extensive work done in preparing this information for the
Commission to review and commented that all fees proposed seemed to be very reasonable.
1991 WORK PLAN
Director Vraa asked the Commission to focus on three separate issues regarding park system planning
issues; short term development (1991), near-term planning (1992-1993) and long-term planning (1994 and
beyond). Ken noted that the Park System Plan as it exists is beginning to show it's age. He suggested that
the Commission should be looking beyond 1991 to start planning for the direction park development will go.
1?.
ADVISORY PARKS AND RECREATION COMMISSION
MINUTES OF DECEMBER 6, 1990 MEETING
PAGE 6
George Kubik suggested that with such an important issue like near-term and long-range planning
the Commission should consider a half day brainstorming meeting in February or March to begin looking at
these issues more closely. Ken Vraa suggested that the meeting take place after the February, 1991 meeting
once the Commission members for that year have been appointed. Mr. Kubik concurred asking that this issue
be added onto the agenda at a later date.
John Griggs asked if staff would look at preparing information before this meeting to enable
Commission members would be more knowledgeable of issues that will have high priorities in the long-range
planning process. Mr. Kubik noted that the re-development of a tree nursery could be one of those near-
term/long-term items. Shawn Hunter added that with the sand volleyball court being experimental in 1990
there may be a need to consider a new park location for a similar function.
WATER QUAUITY
John VonDeLinde introduced Mr. Rich Brasch as the new Water Quality Coordinator for the City
of Eagan. He noted that Rich began with the City in early December and will be focusing his attention on
the Water Quality Management Plan, education, and long range CIP plan as some of his challenging tasks.
John added that everyone is anxious to see what wonderful things Rich will be accomplishing in this newly
created position.
Rich Brasch commented that he will obviously benefit from the expertise of Staff and Commission
in working through neighborhood problems. He asked that if Commission members were aware of a problem
that he needed to be involved with, please notify him at the Municipal Center. John Griggs commented that
one of the largest problems he felt Rich would be dealing with is the issue of pond reclamation. He noted
that he has been told that some residents are dissatisfied with the way ponds are losing water and are hoping
that the City will now have someone they can consistently talk to regarding this issue.
Ken Vraa reminded the Commission that they will be the governing body for water quality in the
future and that there will more and more items listed under this agenda item.
PARKS DEVELOPMENT
Stephen Sullivan explained that Contract 90-1 will be completed in the spring, Contract 90-2 will have
a walk-through for punch list items at Bridle Ridge Park scheduled for December 7. It appears that the Bridle
Ridge building will be reading for a December 15th opening date.
Steve then shared the preliminary plans for Trapp Farm Park playground equipment which is currently
on the drawing board. He noted that Staff has been working to meet the recreational needs of this park and
he though the Commission would enjoy seeing what the proposal included. One thing this playground facility
will provide will be a separation of play areas; the preschool area will be separated from the school age area
but in close proximity to each other so that parents will be able to view children in both age groups playing.
The installation for Trapp Farm Park playground is scheduled for spring, 1991.
BLACKHAWK PARK
Mr. Vraa explained that a community planning meeting is scheduled for December 17 regarding the
development of Blackhawk Park. Notices have been sent to both newspapers inviting the public to participate
in this meeting. Ken noted that it would be appropriate for some Commission Members to be in attendance.
George Kubik stated he was looking forward to the meeting.
16.
ADVISORY PARKS AND RECREATION COMMISSION
MINUTES OF DECEMBER 6, 1990 MEETING
PAGE 7
DEPARTMENT HAPPENINGS
George Kubik thanked the volunteers who generously gave their time to help with the Santa Calling
Program. He also commented on the beginning of 3 man basketball, ski lessons being offered at Hyland Hills
and the dugouts constructed at Goat Hill Park. George also commented on the Presidents Award and Citation
Award presented to the Department. John VonDeLinde noted that the award will be presented to the Park
Rangers at a special meeting next week. Mr. Kubik asked if staff would schedule the appearance of the
Explorers at an early '91 Commission meeting so they could be recognized for their efforts.
Dorothy Peterson noted that staff is hoping to start both skating and tubing in mid-December
provided the weather cooperates for the opening. Mr. Kubik reminded the viewing audience that there are
many activities and events for them to participate in this winter and they can get that information from the
Eagan News newsletter that will be distributed to the public the weekend of December 8th and 9th.
PARK MAINTENANCE
John VonDeLinde noted that the turf maintenance has been completed. He continued that a lot of
sodding was completed at both Northview and Ohmann Parks with the hope that Ohmann can be on line for
spring, 1991. Also noted was the joint effort between I.S.D. 196 and the City at Mueller Farm Park which
was a very successful endeavor.
John continued that the fence is up at Trapp Farm Park and 75 tubes are available for use this year
at the tubing hill. The pleasure rink at Well Site is not available this winter season due to the construction
of the water treatment plant at that site. The Saturday maintenance at both A and B sites will continue the
same as in 1990. Cross-country trail markings are up at Northview, Patrick Eagan and Blackhawk Parks in
preparation for grooming which will be done by again this year by the City of Lakeville. Lake aeration system
is in place at Fish Lake, however Schwanz Lake will not be aerated so that accurate water samples can be
obtained by the DNR at this site. George Kubik also commented that cross-country licenses need to be
obtained by anyone between the ages of 16 and 65 when they are using any of the City's maintained trails.
DECORATE EAGAN JUDGES
Dorothy Peterson asked for two volunteers from the Commission to serve as judges for the Decorate
Eagan contest. The decorated sites will be judged between December 7th and 11th. John Griggs and George
Kubik volunteered to serve as judges.
ROUND TABLE
Ken Vraa reminded the Commission that the January, 1991 meeting would be held on January 10 due
to a conflict with the City Council meeting being rescheduled for January 3rd. He continued that the
Recreation Facility Task Force is closing in on a recommendation for the Council. The committee has been
reduced to a smaller number to incorporate two Council members (Pam McCrea and Dave Gustafson), three
members from the Recreation Facility Task Force and they are looking for one member from the Advisory
Parks and Recreation Commission. It was noted that Jack Johnson has served on the Task Force in the past
and it was suggested that he continue in that capacity unless he was not interested.
John Griggs moved, George Kubik seconded with all members voting in favor that Jack Johnson would
be the representative from the Advisory Parks and Recreation Commission. If Mr. Johnson is not able to
serve in this capacity, Shawn Hunter will represent the Commission.
ADVISORY PARKS AND RECREATION COMMISSION
MINUTES OF DECEMBER 6, 1990 MINUTES
PAGE 8
Ken Vraa explained that the Commission will be reviewing an issue relative to Study Area I in the
future where neighbors have asked that park be placed in an area near their neighborhood. This issue has
gone to the Council by way of a petition from the neighborhood and the Council has asked that the APRC
and staff study this area to see if another park is needed. The Council has also authorized the use of a
consultant if necessary. Mr. Vraa explained that this issue should be appearing on the February agenda.
Shawn Hunter asked if anyone was aware of the trouble at Eagan High School regarding cray fish in
the holding pond adjacent to the school. John Griggs commented that he had heard there was damage to the
irrigation system. Mr. Griggs also commented on the metal barrels that are sitting near the pond area and
suggested that the contents need to be checked. Mr. Vraa suggested that perhaps they contained a clay base
that is put on the bottom of the pond when the water is pumped down.
With no further business to conduct, Ted Billy moved, Dick Carroll seconded with all members voting
in favor to adjourn. The meeting was adjourned at 10:10 P.M.
Secretary Date
MEMORANDUM
TO: ADVISORY PARKS AND RECREATION COMMISSION
FROM: STEPHEN SULLIVAN, LANDSCAPE ARCHITECT/PARKS PLANNER
DATE: DECEMBER 24, 1990
RE: DIFFLEY COMMONS
Background
The Advisory Parks and Recreation Commission reviewed the Diffley Commons application
at the December 6, 1990 meeting. The Commission recommended that the proposal be
revised to include the required open recreation space and resubmitted for the January 10,
1991 meeting.
Review
City Staff has been working with Rottland Homes in regards to this item. Rottland Homes
has revised the site plan layout and acquired an additional one-half acre to accommodate
the open recreation space requirement. The open space is distributed between two areas.
One is located along the west and the other along the northeast perimeters of the site. The
area exceeds the required 41,600 square feet. The developer is currently revising the site
plan and will be presenting the open space scenario to the Commission at the January 10,
1991 meeting.
As also discussed at the December 6 meeting, the proposal is subject to a trails dedication
at $100 per unit. The Planned Development currently has a pending balance for parks
dedication. Staff has met with Hoffman Development Corporation and determined a cash
equivalent to fulfill this parks dedication balance for the entire PD and specifically for this
proposal.
For Commission Action
The Commission may consider the following recommendations for Diffley Commons
Addition:
1. The Eagan Hills West Planned Development be responsible for a revised
parks dedication obligation based on the formula as presented by Staff.
2. Diffley Commons be responsible for a cash parks dedication based on the
revised parks dedication formula for Eagan Hills West Planned Development.
3. Diffley Commons be responsible for a cash trails dedication.
4. The Diffley Commons site plan revision dated 12/26/90 be approved regarding
the open recreational space requirement.
SS:cm
cc: Jim Sturm, City Planner
Todd Stutz, Rottland Homes
/1`.
MEMORANDUM
TO: ADVISORY PARKS AND RECREATION COMMISSION
FROM: KEN VRAA, DIRECTOR OF PARKS AND RECREATION
DATE: DECEMBER 31, 1990
RE: HIGHLINE TRAIL GRADING
Background
This item was placed on the January 10 Advisory Commission Meeting as Old Business
having been continued from the December Commission Meeting. The issue deals with
grading in the Highline Trail north of the Park Knoll Addition and South of Lexington
Pointe Addition. Unauthorized grading was an attempt to control the stormwater runoff
from the Lexington Pointe Addition.
New Ownership
Until this time, Staff has been dealing with Brad Swenson, Tri-Land Development, and tried
to resolve the issue of stormwater and grading in the Highline. However, the Tri-Land
partnership has now been dissolved and Mr. Paul Gross is assuming ownership and
responsibility for this development. City Staff has met with Mr. Gross to resolve a number
of other issues having to do with Tri-Land property holdings. In a recent meeting regarding
the unauthorized grading issue, Staff had the opportunity to explain the history and issues
involved with the Lexington Pointe/Highline grading and was given assurances that this issue
would be resolved.
However, given the recent acquisition of this company by Mr. Gross, they were unable to
acquaint themselves with the issues and the alternative solutions prior to the January 10
Commission Meeting.
A representative of the new company will be available at the January 10 Commission
Meeting to explain the new ownership issue and to express their intent to hire a civil
engineering firm to review alternative solutions to this item. If at all possible, those
alternatives would be available at the February 7 Commission Meeting.
KV/nh
MEMORANDUM
TO: ADVISORY PARK AND RECREATION COMMISSION
FROM: STEPHEN SULLIVAN, LANDSCAPE ARCHITECT/PARKS PLANNER • • -
DATE: DECEMBER 26, 1990
RE: PARK NAMING-WELL SITE PARK
The Commission at the December 6th meeting requested staff to provide names for the
Well Site Park location. The Commission may consider the following park names:
1. Waterworks Park
The name reflects the use of the site for both water treatment and parkland. The
name is not novel. The city of Des Moines, Iowa has a Waterworks Park where both
water treatment and parkland occur complimentary with another.
2. Freshwater Park
The oceans which cover almost three-quarters of the globes surface, hold 97 percent
of all the earth's water. Of the 3 percent balance, being the world's total fresh water
supply, approximately 75 percent is locked up in the polar ice caps and over 23
percent exists in the form of groundwater. Less than 1 percent is present in the
atmosphere and all the terrestrial streams, rivers, lakes, and wetlands combined. In
consideration that the water treatment plant utilizes the freshwater resource, this
name may be appropriate.
3. Aqueduct Park
An aqueduct is defined as a pipe or channel designed to transport water from a
remote source. Aqueducts were one of the 1st public water distribution systems.
4. Aquarius Park
Latin meaning water carrier.
l7.
5. The 5th alternative relates to the flora and the landform found at the Well Site
location. The Commission may consider composing a name based on several
combinations:
Northern Red Oak
White Oak Ravine
Quaking Oak
Big Tooth Aspen Ridge
Ironwood
Hophornbeam Hollow
Chokecherry
Prickley Ash Plateau
FOR COMMISSION ACTION
■ The Commission may consider one of the five names within this report.
■ The Commission may consider a name not included within this report.
■ The Commission may choose not to rename Well Site Park.
48
IMPROVEMENT CONTRACT SUMMARY
EAGAN PARKS AND RECREATION
DECEMBER 26, 1990
Contract
Number Description Park Contractor Contract Amount Total Value Completed % Complete
89-12 Tennis Courts, Hard Courts Northview Athletic Park Finley Bro.Enterprises 5311,744.34 $300,739.41 96%
Color Coating, Softball Bur Oaks Park 5801 Baker Road (4% retainage)
Fields Fencing & Turf Highview Park Minnetonka, MN 55345
Establishment Lexington Park
Country Home Park Contact: Ray Finley
Ohmann Park Phone: 938-7383
Slater Acres Park
89-17 Parking lot, Access Road Northview Athletic Park Alexander Construction 5317,203.70 5317,203.70 100%
Storm Sewer, Trailways 9050 Jefferson Trail (Finaled)
and Turf Establishment Inver Grove Hgts., MN 55077
Contact: Lee Alexander
Phone: 688-2755
89-19 Parking Lot and Thomas Lake Park Corrigan Electric Company 523,932.00 523,932.00 100%
Pedestrian Lighting Ohmann Park 3065 145th St. West (Finaled)
Rosemount, MN 55068
Contact: Don Corrigan
Phone: 423-1131
89-20 Hockey Rink/Free Skate Bridle Ridge Park C. S. I. Electric 536,250.00 536,250.00 100%
Athletic Lighting 5241 West Broadway (Finaled)
Minneapolis, MN 55429
Contact: Mike Pepek
Phone: 533-3344 Page 1 of 2
89-23 Bituminous Trails Thomas Lake Park Barber Construction Co.,Inc. $91,338.40 $92,871.22 101%
Trapp Farm Park P. O. Box 5324 (Finaled)
Quarry Park Hopkins, MN 55343
South Oaks Park
Rahn Park Contact: Jim Barber
Phone: 938-9607
90-1 Grading, Trails, Parking Carlson Lake Park Bituminous Roadways, Inc. $262,764.25 $215,560.18 82%
Utilities, Hardcourts and Wescott Station Park 11201 Rich Valley Blvd.
Turf Establishment Bridle Ridge Park Inver Grove Heights, MN 55077
Coventry Pass Park
Woodhaven Park Contact: Palmer Peterson
Phone: 457-3797
90-2 Park Building Construction Northview Athletic Park W. H. Cates $242,743.40 $215,737.42 88%
Bridle Ridge Park 300 Hwy. #55
Ohmann Park Hamel, MN 55340
Contact: Jeff Cates
Phone: 478-6050
89-X Grading and Turf Coventry Pass Park Enebak Construction Not applicable Not applicable 100%
(private) Establishment P. O. 458 (Finaled)
Northfield, MN 55057
(Coventry Pass Addition
Development Agreement Contact: Roger Odegard
Parkland Dedication) Phone: 333-1307
90-E Grading, Trails, Parking Willmus Park Loeffel Engstrand Not applicable Not applicable 50%
(private) Lots, Utilities, Hardcourts P. S. A. #28 1040 S. 6th Street
Backstop & Turf Establishment Hopkins, MN 55343
(Oak Ridge School- Contact: Roger Coffman
I.S.D. #196, and City cooperative development) Phone 935-0141
Page 2 of 2
TO: ADVISORY PARKS AND RECREATION COMMISSION
FROM: STEPHEN SULLIVAN, LANDSCAPE ARCHITECT/PARK PLANNER
DATE: DECEMBER 27, 1990
RE: BLACKHAWK PARK COMMUNITY MEETING
The city held a community park planning meeting on December 17, 1990 to discuss and
receive public input regarding the future improvement of Blackhawk Park. The meeting was
attended by 51 residents. Shawn Hunter and John Grigg represented Eagan's Advisory
Parks and Recreation Commission. City staff in attendance was Ken Vraa, Director of Park
and Recreation, Stephen Sullivan, Landscape Architect/Park Planner, Rich Brasch, Water
Quality Coordinator, and Pat Jolstad, Naturalist Consultant.
City staff reviewed the parks' planning process, explaining that it would include several
public meetings, review by the A.P.R.C. and the City Council. The construction document
phase would occur upon City Council authorization of a preferred master plan and parks'
program. Construction start-up is projected for the summer of 1991.
Staff presented a history of the land acquisition for Blackhawk Park. Staff also presented
an analysis reviewing: vegetation, slopes, draining, climatic influence, soils, water quality,
wildlife, etc. After the analysis, a worksheet with five questions were distributed to the
residents in attendance. The questions were as follows:
■ What would you like to see in the park plan?
■ What activities would you like to see provided in the park?
■ What do you think the priority of the park should be?
■ What concerns do you have?
■ What comment(s) do you have?
Worksheets were completed by 45 residents in attendance. Staff has attached these
worksheets to the end of this memorandum. Staff has reviewed and is providing an
executive summary of the worksheets for the Commission. The format for this summary
reduces the comments into 6 categories:
■ Facilities to be included within the park.
■ Facilities not to be included within the park.
■ Activities to be included within the park.
■ Design considerations.
■ Concerns.
■ General comments.
Staffs' summary does not reflect the quantitative aspects of the worksheet responses. The
summary simply lists items that were included. If the Commission wishes to understand the
frequency of a particular item, a review of the attached worksheets would provide this
information.
■ Facilities to be included within the park.
• Shelter Building
• Picnic Pavilion
• Fire Ring
• Bridge
• Loop Path Alignment
• Bicycle Trails
• Nature/ Hiking Trails
• Cross Country Ski Trails
• Open Play Area
• Playground
• Sand Volleyball Court
• Sliding Hill
• Wildlife Observation Blinds
• Bandshelter
• Picnic Grounds
• Fishing Pier
• Tennis Courts
• Benches
• Soccer/Football Field
• Drinking Fountains
• Speaker System
• Interpretive Area with Classroom
• Limited Parking and Roadways
• Skating rink
• Nature Center
• Ball Fields
• Canoe Access
The worksheet results indicated a majority wanting: hiking trails, cross country ski trails,
playgrounds, and a sliding hill. The picnic pavilion and park shelter were identified as
preferred facilities at a moderate level. The array of facilities extend from generally passive
type to intensely active types.
■ Facilities not to be included within the park
• Hockey Rinks
• Baseball Fields
• Soccer Fields
• Bituminous Trail
• Snowmobile Trails
• Picnic Pavilion
• Roads
• Parking Lots
• Lighted Athletic Fields
• Ball Fields
• Tennis Courts
• Picnic Area
• Bridge
• Security Lighting
• Shelter Building
• Band Shell
The worksheet results indicated of the facilities not wanted the most within Blackhawk Park
were the picnic pavilion, roads and parking lot. An interestingly aspect in comparing the
facilities wanted and facilities not wanted is that many items are included in both lists.
■ Activities to be included within the park
• Walking/Hiking
• Sledding
• Cross Country Skiing
• Non Organized Games
• Wildlife Observation
• Nature Classes
• Childrens' Fishing
• Jogging
• Bicycling
• Limited Bicycling
• Picnicing
• Star Gazing
• Skating
• Organized Sports
• Summer in the Park
• Fishing
The worksheet indicated a majority wanting activities such as: hiking, cross country skiing,
and sledding. At a moderate level the worksheets indicated an interest in wildlife
observation, nature classes, bicycling, and picnicing within the park.
Cq
■ DESIGN CONSIDERATIONS
• Provide pedestrian access to northern residential area.
• Provide bicycle paths to promote convenient pedestrian usership
from outside the immediate neighborhood.
• Minimize developmental impact within the woodland area.
• The shelter building and picnic pavilion should visually
compliment the natural setting of the parkland.
• Provide recreational opportunities and facilities that provide to
the entire family.
• Active and high use facilities should be placed in the open grass
area (play equipment, buildings, and parking lot).
• Preserve the natural resource.
• Recreational activities should be biased towards younger
children.
• Provide trailways and facilities which are handicap accessible
• Trail alignments should meander; going back and forth from the
lake.
• Provide for quiet spaces.
• Reforest the park to replace any trend removed with
development.
• Passive uses should be placed within the woodland area.
• Minimize impervious areas.
• Maintain a design theme with nature conservation as the
primary objective.
• The use level of the park should not exceed the current level of
usership.
• Provide efficient pedestrian access to the existing trails.
• Vehicular accesses should be lit and controlled .
• Keep the picnic area small using open spaces under trees.
• Limit the parking lot size and have it screened from the
adjacent residential area.
• The vehicular access should occur from Riverton Avenue.
• Provide no vehicular access from Riverton Avenue.
• No vehicular access should occur from Murphy Parkway.
• Evaluate vehicular access from Deerwood Drive.
• The vehicular entrance road should come off Deerwood through
the Murphy property. Utilize the Murphy Parkway access for
pedestrian circulation.
• The development should preserve and enhance the existing
wildlife within Blackhawk Park.
• Distribute pedestrian access point to provide efficient circulation
and minimize impact to one specific area.
• Utilize the historic aspects of park and convey this information
to the users.
• Preserve the significant trees.
• Enhance the grassland area with reforestation.
• Use state and regional park designs as models for development.
• Provide a play area for children of all ages.
• Acquire the remaining portion of Leo Murphy's property to
utilize as parkland.
• Utilize and preserve the visual quality inherent to the park.
• No park development.Leave the park in its current condition.
• The parking lot should not be placed within the center of the
park.
• Keep Riverton pedestrian pathways at their current alignment.
Do not extend the pathway along Riverton Avenue.
C46.
• The addition of the parking lot makes it another park. No
parking lot makes it special.
• Enhance the water quality of Blackhawk Lake.
The prevalent design consideration was the preservation of the natural resource. The scope
of this preservation ranged from no development, limited, to sensitive placement of high use
facilities within the grassland area. One other design consideration was the location of the
vehicular access into Blackhawk Park. The recommendations proposed the access at several
locations: Palisade Way, Deerwood Drive, Riverton Avenue and Murphy Parkway. Several
recommendations proposed no vehicular access to the park. Many of the responses
requested the improvement of the water quality of Blackhawk Lake.
■ Concerns
• Restrict noise generating activities and facilities.
• Concern about alcohol misuse within the park.
• Concern regarding tree loss with access road improvement.
• The adjacent residents are promoting no or limited
improvement to assure their own self interest for privacy and
use of Blackhawk Park.
• Concerned that the design will not promote teen use due to
unfounded and unsupported fears of this age group.
• Concerned that a small level of development could have a
major impact on the existing resources.
• The development of the park will result in the removal of trees
for facilities which are not needed.
• The proposed vehicular entrance to the Blackhawk Park results
in traffic risks to the Blackhawk Ponds neighborhood.
• Do not commercialize the park.
• Developing the park will destroy the parks' beauty.
• Concerned about the park becoming a gathering location for
teens which could result in trouble for the adjacent
neighborhood and vandalism within the park.
• Concerned that the City staff are in the business of
development. They have a development for the sake of
development bias for Blackhawk Park.
• The development of the trails will encourage litter.
• Concern regarding, pollution, land destruction, unsupervised
gatherings,poor police supervision and vandalism.
• Concern regarding the seclusion of the park and the dangers of
night use. I am also concerned regarding danger to the
adjacent neighborhood children with the development of the
park.
• Concern regarding the human intrusion, noise generation, and
park users' disregard to the natural resource.
The prevalent concern was that park development would impact the quality of the existing
natural resource. Several residents within the Blackhawk Ponds subdivision indicated a
concern regarding the intrusion and safety of vehicular access to the park from Murphy
Parkway.
■ Comments
• Use Blackhawk Park for reforestation supplementing the tree
loss which has resulted with the development in Eagan.
• The A.P.R.C. and City Council should consider the community
parkland needs and not simply the immediate neighborhoods'
concerns. Blackhawk Community Park is financed by all of
Eagan's residents.
• Realtors and developers should accurately represent the
proposed parks' development to prospective home buyers.
• The adjacent neighborhood is prompting no or limited
development to assure their own privacy and use of the park.
• We decided to build our home north of Blackhawk Park based
on park access via the proposed bridge.
• I am excited regarding the development of the park.
• Keep the information flow to the community.
• I have lived on the park for 17 years which time I have seen a
continued decrease in wildlife. There are too many
environmental compromises today. Leave Blackhawk Park
alone.
• I appreciate the information provided by City Staff. I hope the
park plan will reflect the desire of most of us.
• Blackhawk Park is a jewel. It is one place where one can feel
they are in the country. Does anyone other than the Parks and
Recreation Department want it developed?
• The quiet and solitude of Blackhawk Park is an essential part
of the community and important to me.
• We have skating, ballfields, tennis courts and playgrounds at
surrounding neighborhood parks. There is no need for these
facilities at Blackhawk Park. Who has asked for development
of this park?
• The Blackhawk Ponds' neighborhood pays on average 5 times
the mean property tax. Placing heavy traffic into the
neighborhood is no way to treat your primary tax income.
• Eagan has enough developed areas and parks. The Community
has voiced its concern about expenditures of dollars both for
development and maintenance of community parks.
• I like your format for developing the park system. It is very
well thought out.
• Eagan has seen explosive growth and development in this past
decade. We need to ensure that the natural landscape is
preserved while providing access to enjoy the beauty of this
resource. Minnesota's greatest asset is our abundance of water.
We must conserve, improve, and maintain Blackhawk Lake.
We have an opportunity to create as well as preserve an oasis
for observing nature. Blackhawk Park is a place for adults and
children to see a bit of nature in our city. Wouldn't it be great
to be able to take you child fishing on a Saturday, right here in
Eagan?
Summary
At the park planning meeting on December 17, staff received a variety of written comments.
Several of these comments are in conflict to one another. The prevalent items in contrast
are road access, parking lot and pavilion. These programmatic conflicts will need to be
resolved during the planning process. Despite these conflicts, it appears there is a general
consensus that the parks' resource should be preserved as well as enhanced with parkland
improvements.
Staff expects additional questionnaires to be submitted to the department from those
residents who live near the park, but who are unable to attend the meeting. Staff will give
the proper consideration to the information as the park planning process evolves.
For Commission Action
There is no action required by the Commission at this time. The Commission may wish to
discuss the information provided as well as add to the list of concerns, comments, program
activities and priorities.
30 .
PARKS AND RECREATION
DEPARTMENT HAPPENINGS
JANUARY 10, 1990 COMMISSION MEETING
1.* As a member of School District 196 Youth Connection Council (Youth Development
Project), staff participated in a discussion concerning the types of projects the Council
would like to see come forward in the form of grant applications. To date, most
applications have been for short term, consumable programs.
Youth Council members from Dakota Hills Middle School voiced the concept of
forming a partnership with Eagan Parks and Recreation.
DHMS youth mentioned two projects. The youth feel the need for a full sized
outdoor basketball court. Perhaps in a park, perhaps at the school. Or, the youth
thought that a project that brought senior citizens and youth together to perhaps plan
trees wold qualify for grant assistance.
The youth revealed that Dakota Hills Middle School held a fund raiser that produced
significant dollars. What is not know, at this point, is whether official discussion from
the school is eminent or, whether the youth were raising a pure trial balloon!
2.** To date eight youth programs have received scholarship assistance for winter
recreation programs. Parents are opting for time payments as they strive to reach
50% of the fee. The choice of payment is the parents' prerogative. Staff has noted
enthusiasm, a "can-do" attitude and broad smiles of appreciation.
3.** The high school connection is being tested for the first time. Announcement of the
December 29th Teen Tubing event was sent to the student council contacts. Staff
will learn how the word of mouth "chain" works, and whether the tubing event peaks
the curiosity of the events.
4.** Staff met with Mike Remmington, Eagan High School tennis coach to inform him of
the department's tennis program. He concurs that the city's tennis camps fill the
needs of the developing player. Ideas for a challenge for varsity players were
discussed,however a course of action has not been identified. Input from the other
south of the river communities will be solicited in order that program options receive
appropriate hearing.
5.** A new Tuesday Coffee Club for Eagan seniors will begin on January 8, 1991. Staff
working with McDonalds has arranged for this opportunity for seniors to meet and
to socialize. Local owner operators Kay and Tom Butler, through their special events
coordinator, Peggy Knutson, have been open to the start of this activity.
Staff's interest is that seniors have yet another opportunity to be together.
McDonald's interest is to attract customers to the store.
Tuesdays were selected because that is the day on which Cub foods provides bagging
and carry out to seniors! Perhaps seniors will combine an 8:00 A.M. breakfast at
McDonalds on Silver Bell Road with a 9:00 A.M. Grocery shopping trip!
6.* Steve Sullivan and Ken vraa recently had an opportunity to visit the manufacturing
and design facility for Landscape Structure; a major supplier for playground
equipment. An insight into the new consumer product safety playground standards
was part of the discussion. Eagan has previously implemented an "Inspection
Program" for play equipment and appears to be ahead of what may soon become
strict playground standards.
7.** Registrations for winter recreation activities are progressing. Snowfall on the opening
date for registration may have reduced the size of the crowd. For the second time,
the Monday evening registration had a low turn out. Staff is leaning toward utilizing
an evening session for summer registration. It does not appear to be warranted for
the winter, spring or fall quarters.
8.** Director Vraa, Recreation Supervisor Oyanagi and Peterson, Park Superintendent
VonDeLinde and Operations Supervisor Pelletier met with Eagan Hockey
Association coordinators to inform the association concerning: maintenance priorities,
procedures and how various weather scenarios effect the operation; the role of
Winter Recreation Leaders; interaction between the department, the association,
outdoor ice coordinator and coaches for practice ice. The Department's hot line,
454-8010, in addition to personal communication to the associations' outdoor ice
coordinator will be used to convey information concerning rink closings.
9.* Twelve co-rec and twenty men's broomball teams are registered for this year's
leagues. Co-rec had to turn away six or more teams.
10.** The Eagan Athletic Association looks to finalize the agreement with the city
regarding the EAA storage building in January. Interior work on shelving, storage
bins and the like is progressing utilizing volunteer labor.
11.** The Blackhawk Park planning meeting held on the 17th of December went very well
with approximately 50 people in attendance. Staff provided an analysis of the park,
it's acquisition history and a review of the flora and fauna present. Residents then
had an opportunity to fill out "input sheets". This information is now being compiled
into a program statement.
12.** Skating rinks opened on Wednesday the 26th. The rinks are in "fair" condition, but
given the extremes in temperature from warm to sub zero, staff is pleased to have
as good of ice as we do.
13.** The sliding hill at Trapp Farm has been open for several days now and again has
been very popular. Wind chills in the minus 40 degrees have caused the facility to
be closed occasionally.
14.* A new park identification sign was installed at the south entrance to Bur Oaks Park,
off of Rolling Hills Drive.
15.* Warm weather through the first part of December allowed the Department to leave
up the tennis nets at Northview, Rahn and Sky Hill Parks. The nets have now been
removed and placed in storage. The continued warm weather also allowed the
Department time to continue its inspection program into December.
16.* New carpet and runners were installed in the new Bridle Ridge shelter building. The
stocking of janitorial and operational supplies and delivery of chairs was also
completed. An extension of the safety net on the east rink was also done as a
measure of protecting the building from possible damage from flying pucks.
17. .Efforts to prepare the hockey and pleasure skating rinks were hampered in the first
half of the month by above average temperatures. The Department originally
expected to begin base flooding operations on December 3 but found it necessary to
wait until December 13 when colder temperatures arrived. Routine maintenance on
the rinks began on December 26, the official day the warming houses were open. By
January 1 the rinks were in good to excellent skating condition with plans to begin
shaving and striping during the first week of the month. Other rink related
maintenance in December included preparations of the warming houses, direction of
cross country ski signs, preparation of the sledding hill and snow tubes at Trapp Farm
Park, etc.
18. .Following the first significant snowfall in mid-December, the city of Lakeville--under
a cooperative partnership with the city of Eagan--began grooming cross country ski
trails in the city's parks. Similar to last year, the city will be operating and
maintaining trails at Patrick Eagan, Blackhawk Community Parks as well as a
novice/beginner trail at Northview Athletic Fields.
19. .Maintenance Staff completed work on constructing four new sets of broomball goals
to be used in the city's expanding adult leagues this winter.
20. •In a program of ongoing improvements to the Rahn Shelter Building, new quarry
tile was installed in the entrance foyer to the building in early December. New
tectum ceiling panels and light fixtures will be added next. Previous improvements
have included new ceiling tiles and carpeting in the community center of the building,
tiling of the restrooms, new door hardware, the addition of two energy efficient
windows, painting of the interior and exterior and rehabilitation of the air
conditioning unit.
21. • Construction began on four new sets of regulation size soccer goals. These goals
will be placed at Ohmann Park for use next season as turf conditions permit.
22. .Aeration equipment was set up at Fish Lake in anticipation of its use some time this
winter. Weather conditions and snow depth will largely dictate when the system will
need to be activated. The Department of Natural Resources will make this
determination and advise the city. The system at Schwanz Lake will not be operating
this year in light of the diagnostic feasibility study and in basin sampling which will
be done during the winter months (i.e. so as not to bias sampling results).
23. .The Forestry Department continued with the pruning of trees during the month of
December. The winter months actually offer the prime opportunity for pruning trees
given the inactivity of most insects and diseases and dormancy of sapwood.
24. .Superintendent of Parks John Vondelinde has been elected to the Board of
Directors of the Minnesota Recreation and Park Association. John will be filling a
two year vacancy and will begin his term in January. The M.R.P.A. is a statewide
organization of leisure service professionals with a current membership of about 300.
25. .4 On December 18, the City Council was presented with a citation award from the
Minnesota Recreation and Park Association in recognition of the City's Park Ranger
Explorer program. Five of the park rangers received the award from a representative
of M. R. P. A. and Mayor Egan. This is the fourth consecutive year that the Parks
and Recreation Department has received a Citation Award from M. R. P. A.
26. •On December 12 and 13 Park Operation Supervisor Rich Pelletier participated in
a two-day training seminar at the regional headquarters of Motorola Inc. in
Schaumburg, Illinois. This workshop provided an opportunity for hands on training
in the use and troubleshooting of the MRI 5000 irrigation controller which Eagan
currently has at four of its athletic facilities.
27. .During the summer of 1989, the staff from the Minnesota Pollution Control Agency
and the City of Eagan sampled the waters of Thomas Lake to determine its general
condition. The results of that effort are included in a Lake Assessment Program
Report recently published by the Pollution Control Agency. The report confirms the
existence of a significant problem with the water quality of the lake. Only a very
large reduction in the plant nutrient phosphorous - both in the lake and in runoff
entering the lake - will allow the lake to support the uses contemplated in Eagan's
Water Quality Management Plan. The major question posed in the report is whether
such a reduction is possible.
28. .Recreation staff have begun work on plans for the Winter Week-end; February 1,
2 and 3, 1991. A snow volleyball tournament is a new offering this year. A bracket
geared to high school students is planned.
29. • Work on the Discover Us! portion of the 1991 City map is progressing. An updated
facility/park grid is a prominent feature of the Department's side of the map.
30. .Planning for spring programs will begin in the next ten days to two weeks. A
Recreation sub-committee meeting may be necessary as early as February 7th.
31. .All eleven warming shelters have been in operation for at least one week. Trapp
Farm Park tubing hill has been open since December 15th. Despite sub-zero
temperatures, the rinks have been busy days through the winter vacation week. The
new Bridle Ridge Park Shelter Building has seen 60 to 100 people during a busy
afternoon. Due to the temporary closure of Well Site Park, numbers are higher on
all of the other available sites. The new hot chocolate sales at Trapp Farm, Goat
Hill, Sky Hill and Bridle Ridge has been extremely popular. We have had to re-order
hot chocolate mix several times.
32. •Broomball began December 30 and 31 at Quarry Park. This year 20 teams are
sliding through a season of seven weeks. That's an increase of two teams. Co-rec
Broomball begins January 4 with a league of twelve teams. Expansion is being
considered for this rapidly growing program.
33. .Eight teams began the 4-man hockey season January 2. This is an increase of three
teams over 1990. Games are played Wednesday evenings at Bridle Ridge Park.
34. .Basketball resumed play January 2 and 3. Sixteen, five-man teams and ten, three-
man teams are enjoying these leagues. Their season runs into March.
35. Both officiated and recreational volleyball leagues are filled to gym capacity. Co-ed
recreational volleyball has 32 teams registered and officiate co-ed volleyball has 16
registered teams. The womens officiated volleyball league is filled with 8 teams.
36. .The Grand Opening of the Bridle Ridge Park Shelter Building was held Sunday,
December 30th. Hot chocolate and cookies were available to t hose who came to
celebrate. The "Bridle Ridge Bunny" was on hand to skate with the children and led
them in some games. A door prize drawing was held, and three people went home
with a $10.00 Eagan Parks and Recreation certificate good towards any recreation
program in 1991. Staff estimates that a total of 50-60 people were at the celebration.
* 12/18/90 Council
* * 1/3/91 Council
• 1/10/91 Commission
~5.
SUBJECT: PRELIMINARY PLAT
DLFFLEY COMMONS
APPLICANT: SIENNA CORPORATION
LOCATION; PART OF P.I.D. #10-02000-010-51
EXISTING ZONING: R4 (MULTIPLE)
DATE OF PUBLIC HEARING: NOVEMBER 27, 1990
DATE OF REPORT: NOVEMBER 16, 1990
COMPILED BY: COMMUNITY DEVELOPMENT DEPARTMENT
APPLICATION SUMMARY: An application has been submitted by Sienna Corporation
representing Rottlund Homes requesting a Preliminary Plat for 208 multiple family dwelling
units on approximately 27.6 acres.
LOCATION: The site is located directly south of the Ken Appelbaum and Cedar Grove 7th
Additions, east of the remaining parcel #10-02000-010-51, north of Christ Evangelical
Lutheran Church and Diffley Road, and west of Northwestern Bell Telephone Company,
Cedar Grove Baptist Church, Rahn Villa Apartments, Rahn Road and Eagan On The Green
apartments. The proposed plat lies within School Districts 191 and 196.
COMP. PLAN: The proposed development is consistent with the Comprehensive Land Use
Guide Plan designation of D-III (Mixed Residential, 6-12 units per acre).
The subject property was part of Area M of the Multi-Family Residential Land Study.
Given the existence of a Planned Development Agreement governing development of this
site, Area M was removed from further consideration under this study by the City Council
at its June 4, 1990 workshop meeting.
PLANNED DEVELOPMENT: Diffley Commons will be located in the Eagan Hills West
Planned Development. The exhibits contained in the P.D. Agreement show a designation
of "high density, 16 + units/acre" for this portion of the P.D. Normally, a P.D. Amendment
would be required for a reduction in density such as is occurring with the Diffley Commons
development. However, the Eagan Hills West P.D. Agreement contains a provision that
states, "less density shall be permitted at Developer's sole discretion", therefore no P.D.
Amendment is required in this case.
EXISTING CONDITIONS: The open grassy site has gently rolling hills which gradually
slope down to the north. There is a pond located at the southeast corner of the site.
SITE PLAN & CODE COMPLIANCE: The site plan indicates the total area is 27.6 acres.
Sienna is proposing ten 4-unit buildings (quads), fifteen 8-unit buildings, and four 12-unit
buildings (condominium units) for a total of 208 units. The plat density is 7.5 units per acre.
Access to the site is provided from County Road 30 (Diffley Road). The applicant is
proposing a public street with a horseshoe type design and two cul-de-sacs stemming from
it. One of the access points lies directly across from Beaver Dam Road to the south to
create an intersection on Diffley Road. The second access point is located 576' west of the
access which is across from Beaver Dam Road. This second access was located as close to
the crest of the hill along Diffley Road as possible. Across Diffley Road is Christ
Evangelical Lutheran Church. The church has two access points along Diffley Road, as well
as one on Beaver Dam Road. The access points do not meet, but are offset. Dakota
County has expressed some concern regarding the spacing of proposed access points along
Diffley Road. The current proposal meets the existing County requirement at an 1/8 mile
of a mile, however the County will be approving new standards which will correspond to
their 20-year plan. The County would like to see an additional 15' of right-of-way dedicated
with the project. This would provide for a median when Diffley Road is upgraded. The
additional 15' would increase the half right-of-way width from 60' to 75'. The proposed plan
could accommodate the additional right-of-way request and maintain the 50' setback
required for Diffley Road.
The City Code requires one enclosed, or underground garage space per unit and one
outdoor space per unit. The plan indicates 761 total parking spaces: 324 garage stalls (116
above City Code requirements) and 437 exterior parking stalls (229 above City Code
requirements). The project provides 345 parking spaces above the required 416 parking
stalls.
The buildings are all owner-occupied and meet exterior building code requirements for
multiple residential. The villa (8 and 12 unit buildings) are maintenance free brick and
aluminum siding and have upgrade shingles. The color of the buildings will be uniform. The
individual units range from 1,100 sq. ft. for the middle units to 1,200 sq. ft. for end units.
Each villa unit comes complete with appliances, central air, fireplace, and patio. The middle
units have single car garages; the end units have two car garages. The quad units are 1,350
sq. ft. with brick and aluminum siding. The two-bedroom units are all one level type with
double garages.
This project has been completed by the Rottlund Company in many other metropolitan area
communities such as Plymouth, Shoreview, Inver Grove Heights, Blaine, Brooklyn Park, and
Apple Valley. The projects have sold quickly in these communities, from eight to fourteen
months in Apple Valley.
LANDSCAPING: The landscaping plan conceptually is done very well. It provides for a
variety of over and understory plant material and year round color, however, recommend
tightening the spacing along Diffley Road and adding more material to provide better
screening.
PARKS & RECREATION: The proposal is within the Eagan Hills West Planned
Development. The P.D. Agreement indicates a sequential parkland dedication with the
incremental platting of the Planned Development.
~rl.
GRADING/DRAINAGE/EROSION CONTROL: This plat provides for the grading of an
undeveloped area of the City that is located along the north side of Diffley Road between
Blackhawk Road and Rahn Road. The existing area of the plat has a maximum
differential in elevation of approximately 28'. The site is primarily an open field with
young trees and brush. Pond AP-35 is located in the south central part of the plat.
Pond AP-35 is a designated ponding area in the City's Comprehensive Stormwater
Management and Water Quality Management Plans.
The proposed grading will disturb the entire site except for the area around and including
Pond AP-35. The maximum change in grades as a result of the site grading will be
approximately 18' in the northeasterly portion of the site. The maximum street grades
within the site will be 2.5% and the street intersections with Diffley Road will meet the
City's design standards for grades of 2% or less.
Grading of the site will not significantly alter the drainage patterns as identified in the
City's Comprehensive Stormwater Management Plan. Drainage from the site presently
flows either into Pond AP-35, which does not have an outlet, or west into the existing
storm sewer system within Eagan on the Green. This system was originally designed to
accommodate limited flows from this site.
As part of this development, an outlet for Pond AP-35 will be provided. The outlet will
be designed in accordance with the City's Storm Water Management and Water Quality
Management Plans and will outlet into the existing storm sewer system within Eagan on
the Green.
In addition to site generated storm water flows, 5.0 acres from the easterly adjacent
property are included in the pond sizing requirements for Pond AP-35.
In addition to Pond AP-35, another pond is proposed to be constructed in the northwest
corner of the development. This pond will receive water from the northerly portion of
the development and provide partial treatment of waters to satisfy a part of the
development's water quality requirements. The outlet for this pond would be connected
to the existing storm sewer system within Eagan on the Green.
Surface water runoff from the southwesterly portion of this development will be directed
into proposed lateral storm sewer systems which will connect to the existing storm sewer
system within Eagan on the Green.
WATER QUALITY: The two ponds within the site as proposed will partially satisfy the
water quality requirements for the development.
Since water quality treatment for drainage areas from outside of the development (7.8
acres) is being provided for in Pond AP-35, which is within the development, staff
recommends that a credit equal to the outside drainage area be given to the development
for the shortage of treatment that is within the development. Staff is currently working
with the development to finalize the water quality requirements.
UTILITIES: Sanitary sewer of sufficient size, capacity, and depth is available within Rahn
Road and is proposed to be extended to serve the plat. In addition, a sanitary sewer stub
for the undeveloped land to the east is proposed. This stub along with the existing sewer
along the north side of Diffley Road will adequately serve the undeveloped area to the
east.
Water main of sufficient size and capacity is available on the west side of the plat and
along the south side of Diffley Road. Water pressures in this area of the City, which is
within the intermediate pressure zone, are relatively low. Staff recommends that all lateral
water main within the development be a minimum size of 8". In addition, staff
recommends that water main be extended to the northeasterly corner of the plat for
future extension through and looping of the undeveloped area to the east.
STREETS/ACCESS/CIRCULATION: Access to the plat is proposed in two locations
along Diffley Road. The easterly intersection will be directly opposite Beaver Dam Road
and is a potential site for a future traffic signal. Dakota County Highway Department is
reviewing access to the plat from Diffley Road and will provide comments in the future.
County personnel have indicated, during preliminary discussions, that the westerly access
will be restricted to right turn in and right turn out. They have also indicated a desire to
see a preliminary plat for the entire undeveloped area north of Diffley Road to better
assess all future traffic needs from the area.
Streets within the plat are proposed to be a combination of public and private. Based
on projected traffic volumes (1800-2000 ADT), City Code identifies the loop street be
classified as a low collector which would require either a 36' or 44' street width. Without
a proposed concept plan for the easterly adjacent property, traffic projections can only
take on the worse case scenario based on 16 units per acre. Approximately 20 acres @a
16 units per acre yield an additional 2600 to 3200 trips per day. The remaining public
streets are proposed to be 32' wide which satisfies current City Code requirements.
Staff recommends that the loop street be widened to 44' at the Beaver Dam Road
intersection with Diffley Road. This width will allow for one lane of incoming and two
lanes of exdting traffic. If the County restricts access at the westerly entrance, the
additional width is not required at that location.
Private streets that will serve more than 4 units are proposed to be 24 wide and all other
private streets are proposed to be a minimum of 16' wide. Both of these widths meet
current City Code requirements.
RIGHT-OF-WAY/EASEMENTS/PERMITS: Right-of-way for public streets meeting current
City standards and utility easements of sufficient width based on depth of utilities are
required as part of the plat. In addition, drainage and utility easements for Pond AP-35
and the proposed pond in the northwest corner of the plat will be dedicated as part of
the plat. '
The development will be responsible for ensuring that all regulatory agency permits
(MPCA, Minn. Dept. of Health, MWCC, Corps of Engineers, Dakota County Highway
Department, etc.) are obtained prior to final plat approval. In addition, a permit or
easement vacation will be required from ENRON Gas Pipeline Company for their
easement that crosses the plat.
FINANCIAL OBLIGATION - DIFFM COMMON
Based upon the study of the financial obligations collected in the past and the uses proposed
for the property, the following charges are proposed. The charges are computed using the
City's e)dsting fee schedule and connections proposed to be made to the City's utility system
based on the submitted plans.
Improvement Project Use Rate Quantity Amount
Lateral Benefit 64 M.F. $23.38/ff 1196ff 7 6
Water Trunk
Total $27,962
PRELIMINARY PLAT CONDITIONS FOR DIFFLEY COMMONS ADDITION
1. These standard conditions of plat approval as adopted by Council action on July
10, 1990 shall be complied with:
Al, B1, B2, B3, B4, Cl, C2, C4, C5, Dl, E1, F1, Gl, and H1.
2. Final landscaping plan shall be prepared on grading plan.
3. The project shall have an underground irrigation system.
4. All plant material shall meet City minimum standards.
5. The development is required to provide additional right-of-way for DifIley Road
as required by Dakota County.
6. The development is required to provide storage volumes and ponding easements
for Pond AP-35 and the proposed pond in the northwesterly portion of the site
in accordance with requirements as identified in the City's Comprehensive
Stormwater and Water Quality Management Plans based upon final plat
development plans.
7. The development is required to provide water and sanitary sewer service stubs to
the easterly adjacent property.
8. The development is required to provide information relative to projected traffic
trip generation for the easterly adjacent property to ensure the appropriate street
surface width of the proposed loop public street.
STANDARD CONDITIONS OF PLAT APPROVAL ,
A. Financial Obligations
1. This development shall accept its additional financial
obligations as defined in the staff's report in
accordance with the final plat dimensions and the rates
in effect at the time of final plat approval.
B. Easements and Rights-of-Way
1. This development shall dedicate 10' drainage and utility
easements centered over all common lot lines and adjacent
to private property or public right-of-way.
2. This development shall dedicate, provide, or financially
guarantee the acquisition costs of additional drainage,
ponding, and utility easements as required by the
alignment, depth, and storage capacity of all required
public utilities and streets located beyond the
boundaries of this plat or outside of dedicated public
right-of-way as necessary to service this development or
accommodate it.
3. This development shall dedicate all public right-of-way
and temporary slope easements for ultimate development
of adjacent roadways as required by the appropriate
jurisdictional agency.
4. This development shall dedicate adequate drainage and
ponding easements to incorporate the required high water
elevation necessitated by City storm water storage volume
requirements.
C. Plans and Specifications
1. All public streets and utilities necessary to provide
service to this development shall be designed by a
registered professional engineer in accordance with City
codes, engineering standards, guidelines and policies.
2. A detailed grading, drainage, erosion, and sediment
control plan must be prepared in accordance with current
City standards prior to final plat approval.
3. This development shall insure that all temporary dead end
public streets shall have a cul-de-sac constructed in
accordance with City engineering standards.
STANDARD CONDITIONS OF PLAT APPROVAL
PAGE TWO
4. A detailed landscape plan shall be submitted on the
proposed grading plan. The financial guarantee shall be
included in the Development Contract and not be released
until one year after the date of installation.
5. All internal public and private streets shall be
constructed within the required right-of-way in
accordance with City Code and engineering standards.
D. Public Imcrovements
1. If any public improvements are to be installed under a
City contract, the appropriate project must be approved
at a formal public hearing by Council action prior to
final plat approval.
E. Permits
1. This development shall be responsible for the acquisition
of all regulatory agency permits in the time frame
required by the affected agency..
F. Parks and Trails Dedication
1. This development shall fulfill its parks dedication
requirements as recommended by the Advisory Parks and
Recreation Commission and approved by Council action.
G. Water Quality Dedication
1. This development shall be responsible for providing a
cash dedication in addition to/in lieu of ponding
requirements in accordance with the criteria identified
in the City's Water Quality Management Plan.
H. Other
1. All standard platting and zoning conditions shall be
adhered to unless specifically granted a variance by
Council action.
Advisory Planning Commission City Council
Approved: August 25, 1987 September 15, 1987
Revised: July 10, 1990
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Minnesota Pollution Control Agency
520 Lafayette Road, Saint Paul, Minnesota 55155-3898
Telephone (612) 296-6300
MINNESOTA 1990
November 27, 1990
To Whom It May Concern:
Enclosed for your information is a copy of "Lake Assessment Progr m - 1989:
Thomas Lake." The Lake Assessment Program (LAP) is designed to a sist lake
associations or local units of government in the collection of ba eline lake
water quality data. The general work plan for LAP includes coope ative lake
sampling by Minnesota Pollution Control Agency (MPCA) staff and t e association
or local government unit, participation in the Citizen Lake-Monit ring Program
(CLMP) by local representatives, examination of land use and drai age patterns
in the watershed of the lake, and an assessment of the data colle ted.
This document represents an assessment of the current trophic sta us of Thomas
Lake based on data collected as a part of LAP.
If you have any questions regarding this document, please contact Willis J.
Munson, Program Development Section, Water Quality Division at (612) 296-9192.
Sincerely,
Gerald L. Willet
Commissioner
GLW: jae
Enclosure
Regional Offices: Duluth • Brainerd • Detroit Lakes • Marshall • Rochest r
Equal Opportunity Employer Printed on Recycled Paper
LAKE ASSESSMENT PROGRAM
1989
THOMAS LAKE
(I.D. NO. 19-0067)
DAKOTA COUNTY, MINNESOTA
Minnesota Pollution Control Agency
Division of Water Quality
Steven Heiskary and Willis Munson
October 1990
TABLE OF CONTENTS
Page
List of Tables . . . . . • • • • • • 1
List of Figures . . . . . • • • • • • • i
List of Appendices . . . . • • • • • • • • • • • • • • • . . ' ' ' . ' 1
Summary and Recommendations . . . . . . . . . . . . . . . . . . . . . ii
Introduction . . . . . . . . . . . . . 1
Background . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Results and Discussion . . . . . . . . . . . . . . . . . . . . . . . . 8
In-lake Conditions: 1989 . . . . . . . . . . . . . . . . . . . . . 11
Water Quality Trends . . . . • • • • • • • • • 17.
Modeling Summary . . . . . . . . . . . • . • . 19
Goal Setting . . . . . . . . . . . . . . . . 25
References . . . . . . . . . . . . . . . . . . . . . 27
Appendices - Additional Information Sources . . . . . . . . . 29
1
LIST OF TABLES
Page
1. Thomas Lake: Morphometric, watershed and
fishery characteristics . . . . . . . . . . . . . . . . . . . . . . 4
2. Historical chronology of Thomas Lake . . . . . . . . . . . . . . . . 5
3. Thomas Lakes: average summer water quality and trophic
status indicators . . . . . . . . . . . . . . . . . . . . . . . . . 12
4. Modeling data: MINLEAP
a. Based on 114-acre watershed . . . . . . . . . . . . . . . . 22
b. Based on 1,297-acre watershed . . . . . . . . . . . . . . 23
c. Based on 6,197-acre watershed . . . . . . . . . . . . . . . 24
LIST OF FIGURES
1. Thomas Lake location map - ecoregion . . . . . . . . . . . . . . . 7
2. Thomas Lake bathymetric map: sampling stations . . . . . . . . . . 9
3. Thomas Lake watershed map . . . . . . . . • • . • • . • • • • • . 10
4. Carlson trophic state index values . . . . . . . . . . . . . . . . . 16
5. Scatterplots of chlorophyll, Secchi transparency
and total phosphorus . . . . . . . . . . . . . . . . . . . . . 18
APPENDICES
A. Lake assessment program (LAP) application . . . . . . . . . . . . . 29
B. Thomas Lake water quality data . . . . . . . . . . . . . . . . . . 33
C. MDNR fisheries survey summary . . . . . . . . . . . . . . . . . . . 39
D. Location map of storm sewers . . . • • • • • • • • • • • • • • • • 43
E. State climatology' office data: Precipitation . . . . . . . . . . 47
11
SUMMARY AND RECOMMENDATIONS
Thomas Lake is located in Eagan, Minnesota, in Dakota County in ce tral
Minnesota. It is a small shallow lake with a maximum depth of 6.2 feet. The
surface area of the lake is 43 acres, placing it about the 50th percentile of
lakes in the state in terms of size (MDNR, 1968). The watershed is relatively
large (approximately 6,200 acres), compared to the surface area of the lake
(144:1 ratio). About 50 percent of the watershed is urban, a hig percentage
for lakes in this part of the state, the North Central Hardwood F rest (NCHF)
ecoregion. The watershed has an extensive storm sewer network dr ining this
highly urbanized area.
Thomas Lake was sampled during the summer of 1989 by staff of the Minnesota
Pollution Control Agency (MPCA) and the city of Eagan as a part o the Lake
Assessment Program (LAP). Water quality data collected during th s study
indicates that Thomas Lake is hypereutrophic with a mean total ph sphorus
concentration of 103 ug/1, mean chlorophyll concentration of 29 u /1 and a mean
Secchi transparency of 2.4 feet. The maximum chlorophyll concent ation for the
summer was 44 ug/1. The total phosphorus and chlorophyll concentrations are
high when compared to representative minimally impacted lakes in the NCHF
ecoregion, and the Secchi transparency is subsequently low. Compared to other
lakes in the NCHF ecoregion, the phosphorus concentration ranks higher than the
90th percentile, which means that over 90 percent of lakes in the ecoregion
contain lower concentrations of total phosphorus than Thomas Lak , while less
than 10 percent of the lakes exhibit higher total phosphorus con entrations.
111
State-of-the-art computer models were used to estimate existing water quality
conditions in Thomas Lake. The models did a good job of estimating the in-lake
conditions observed during 1989. However, in view of the very dry conditions in
1989, the results should be viewed with caution. These models can be helpful
for predicting and diagnosing the water quality of Thomas Lake, estimating
in-lake conditions based upon changes in lake use with the watershed and setting
water quality goals.
Based on the results of the 1989 LAP study, it would be desirable, at a
minimum, to maintain existing (1989) conditions. Should improvements in water
quality be sought, i.e., a reduction in chlorophyll a concentrations or
improved transparency, the results of the models used in this study will be
useful. Since the majority of the phosphorus load to the lake appears to be
from the watershed, efforts on improvement should be focused in that area.
However, because of its shallowness and tendency to mix intermittently
throughout the summer, the lake itself may be releasing phosphorus from bottom
sediments. (This process is called internal loading.) A more detailed study
would be required to determine whether improved conditions can be achieved
through implementation of watershed controls or in-lake measures to deal with
internal loadings. The following recommendations are based on the 1989 LAP
study of the lake:
1. It is important to note that the lake is sensitive because of its
shallowness and that relatively minor increases in nutrient loading rates
from any watershed or in-lake sources can degrade the lake. It is
essential, therefore, that lake protection efforts be undertaken by all
iv
I
local government groups with land use/zoning authorities for Thomas Lake.
The city of Eagan should be commended for their efforts to d te, which
include interacting with the Dakota Soil and Water Conservat on District
(SWCD), and participating in the Gun Club Lake Watershed Man gement
Organization (WMO) report, and participating in the Citizen ake Monitoring
Program (CLMP). To complement these efforts, the city of Ea an should
develop a plan for protecting the water quality of the lake. The following
activities could be included in the plan:
a. The city of Eagan should continue to support the Citizen Lake-
Monitoring Program (CLMP). Data from this program provi es an
excellent basis for assessing long-term and year-to-year variations in
algal productivity, i.e., trophic status of the lakes. t a minimum,
measurements should be taken weekly during the summer at the deepest
site in each basin, e.g., site 102 in the west basin, site 101 (201) in
the middle basin and site 103 in the east basin (Figure 2).
' b. Education of homeowners around the lake and watershed with respect to
lawn maintenance and shoreline protection may be benefi ial. Staff
from the MPCA and the Minnesota Department of Natural R sources (MDNR),
along with county officials, such as staff from Agricul ural Extension
Office, and the Dakota County Soil and Water Conservati n District and
Planning and Zoning could provide assistance in this ar a. The
booklets, A Citizens' Guide to Lake Protection and Prot cting
Minnesota's Waters: The Land-Use Connection, may be us ful education
tools.
v
Further development in the immediate watershed of the lake should occur
in such a manner as to minimize water quality impacts on the lake.
Considerations such as setback provisions should be strictly followed.
MDNR,s shoreland regulations will be important in this regard. Also,
activities in the total watershed that change drainage patterns, such
as wetland removal or major alterations in lake use, should be
discouraged unless they are carefully planned and adequately
controlled. The city of Eagan should continue to seek representation
on boards or commissions, e.g. watershed management organizations, that
address land management activities so that their impact on the lake can
be minimized.
c. A more detailed examination of the possible nutrient sources such as
from wetland run-off, agricultural run-off, construction sites, lawn
fertilizers, and the effects of ditching and draining of wetlands,
etc., may aid the city in determining areas where improvement is
needed. Some of the county offices mentioned above may be of help in
this regard.
2. The 1989 water quality of Thomas Lake was poor relative to other lakes in
the ecoregion. It could, however, exhibit a measurable decline in
transparency, increases in the amount of algae and possibly increases in
the amount of rooted vegetation with increases in in-lake total phosphorus.
Changing land-use practices in the watershed, e.g., increased development,
and routing additional storm water runoff into the lake, provide the
vi
greatest likelihood for changes in phosphorus loading. However,
internal loading of phosphorus from the lake's sediments or the excessive
use of herbicides to reduce the amount of rooted vegetation could be
additional sources of phosphorus.
Conversely, a reduction of the amount of nutrients that ente the lake may
result in improved transparency and a reduction in algal con entrations.
One means of reducing nutrient input is by implementing best management
practices (BMPs) in the watershed (land management activities used to
control nonpoint source pollution). Technical assistance in BMP
implementation may be available through local resource manag ment
agencies. The city should continue.to work with the Dakota WCD to
examine land use practices in the watershed and develop stra egies for
reducing the transport of nutrients to the lake. The handbo k, Protecting
Water Quality in Urban Areas, may be a useful tool for the city.
It is in the best interest of the city to continue to work with the Dakota
SWCD, Gun Club Lake WMO, and to do as much as possible to pr tect the
condition of the lake by means of local ordinances and education of
shoreland and watershed area residents. If these steps prove to be
inadequate or lake condition worsens (as evidenced by significant declines
in Secchi transparency), a more comprehensive study should a started.
3. Should a more extensive study be deemed necessary, this LAP report serves
as a foundation upon which further studies and assessments ay be based.
The water and nutrient income-outgo summaries were estimate based on
i
vii
limited amounts of monitoring data and should be considered best
approximations. The next step would be to define water and nutrient
sources to the lake in a much more detailed fashion. This should be
accomplished prior to implementation of in-lake restoration techniques.
These detailed studies would allow the estimation of reasonably accurate
total phosphorus (and ortho-phosphorus), a total nitrogen (and inorganic
nitrogen) and water income-outgo summaries.
The experience gained through a more comprehensive study such as is being
conducted by the city of Eagan on Schwanz Lake through the MPCA Clean Water
Partnership (CWP) Program should be applied to Thomas Lake.
4. The city of Eagan, in their water quality management plan, classified
Thomas Lake as a "Class I - Direct Contact Recreation" lake. The city
acknowledges that the lake does not currently meet the criteria of this
class. Based on the results of the LAP study, it appears that a very large
reduction in in-lake phosphorus concentration would be necessary to meet
the criteria (1989 concentration of 103 ug P/1 vs. 35 ug P/1 recommended
for Class I lakes). Reducing in-lake phosphorus concentrations to this
level seems unlikely because of the shallowness of the lake and the very
large size (and subsequently high phosphorus loading) of its watershed. If
phosphorus concentrations cannot be reduced substantially, the city may
want to consider changing the classification of Thomas Lake to perhaps a
Class II lake. Even then, reductions in the phosphorus concentration would
be necessary to meet the criteria of that classification.
viii
i
The intent of LAP is to provide lake associations/municipalities w th baseline
water quality data and direction for additional studies. It is no intended to
replace a diagnostic-feasibility study. The recommendations in this report are
based on limited data. Additional study is needed to more complet ly
characterize this lake's water quality problems and to determine a propriate
lake management methods.
1
LAKE ASSESSMENT PROGRAM: 1989
Thomas Lake
(I.D. #19-0067)
INTRODUCTION
Thomas Lake was sampled by the Minnesota Pollution Control Agency (MPCA)
during the summer of 1989 as a part of the Lake Assessment Program (LAP). This
program was designed to assist lake associations or municipalities in the
collection and analysis of baseline lake water quality data for the purpose of
assessing the current trophic status of their lake. The general work plan for
LAP includes participation in the Citizen Lake Monitoring Program (CLMP),
examination of land use and drainage patterns in the watershed o the lake and
an assessment of the data collected.
Thomas Lake was sampled on four occasions during the spring and ummer of
1989. Steve Heiskary and Willis Munson sampled the lake during ay.
Craig Knudsen, Eagan Department of Public Works, and Willis Muns n sampled the
lake during the summer. CLMP measurements were collected during the
summer of 1989 by Mark Ochs. Land-use information for the lake, watershed was
assembled from the Dakota SWCD records by Jon VonDeLinde, Superi tendent of
Parks for the city of Eagan. Watershed boundaries were delineat d by the Dakota
Soil and Water Conservation District (SWCP) as a part of the Gun Club Lake Water
Management Organization (WMO) report for the entire Eagan area.
2
BACKGROUND
Thomas Lake is located in the city of Eagan in Dakota County. It is a rather
small lake approximately 43 acres and is very shallow with an average depth of
about 4.5 feet (Table 1). According to a previous United States Geological
Survey (USGS) report (Ayers, 1980), Thomas Lake was originally a closed basin
within the hummocky, sandy moraine deposits (as was the case with most of the
lakes in Eagan). Changing land use from rural to urban (seven percent urban in
1980 to 50 percent in 1990) and the accompanying increase in runoff led to the
development of an extensive storm sewer network throughout the city, which links
the many formerly closed basins which dot the Eagan landscape. These storm
sewers in effect increase the watersheds of the lakes and also tend to increase
the nutrient and sediment load to the lakes. In the case of Thomas Lake, the
watershed was increased from about 114 acres to 1,297 acres. A linkage with a
watershed to the east via the storm sewer system added approximately 4,900 acres
to the drainage area of Thomas Lake.
A brief history of Thomas Lake and its watershed was assembled by
John VonDeLinde and is summarized in Table 2. This history points to a number
of changes and alterations in the watershed of the lake as a result of
increasing development in the Thomas Lake watershed and adjacent watersheds.
In 1987, the city of Eagan established a Water Quality Task Force, consisting of
state agency representatives, city staff and local citizens. The charge of this
task force was to develop a plan to protect and improve the quality of Eagan's
numerous lakes and ponds. One step in the process was to classify all
3
i
water bodies in the city as to desired/managed uses and subsequently develop
management criteria for each class. Thomas Lake was included among the Class I
lakes, those intended for direct contact (i.e., swimming). The water quality
management criteria for that classification are as follows:
- Carlson TSI (Secchi) - summer average not to exceed 55;
- Fecal coliform organisms not to exceed 200 organisms/ml; and
- Dissolved oxygen not less than 5 mg/1.
Thomas Lake currently does not meet the TSI criteria (city of Eagan, 1990).
Because land use affects water quality, it is useful to divide the state into
regions where the land use and water resources are similar. For Minnesota, this
results in several regions, referred to as "ecoregions." These are defined by
soils, land use, land surface form and potential natural vegetati n. Thomas
Lake is located in the North Central Hardwood Forests ecoregion (Figure 1).
Land use in its watershed is split between open (approximately 50 percent) and
developed land use (Figure 3). The developed area is rather evenly split
between multi-family and single-family residential.
In this portion of Minnesota, average annual precipitation ranges between 26 to
28 inches and evaporation ranges between 34 to 36 inches (Gunard, 1985).
Summer (May to September) precipitation averages about 19 inches. For the
period June to September, 1989 about 12 inches of precipitation were received
near Thomas Lake (Rosemount Agri. Exp. Station).
4
TABLE 1. THOMAS LAKE: MORPHOMETRIC, WATERSHED
AND FISHERY CHARACTERISTICS.
STORET I.D. #19-0067
Areal: 43.6 acres (17.6 ha)
Mean Depth: 4.5 feet (1.4 m)
Maximum Depth: 6.2 feet (1.9 m)
Volume: 200 acre-ft (.246 Hm3)
Watershed Area 1: 114 acres (direct) 4
1,297 acres (total)
Watershed Area: Lake surface area ratio: 2.6:1 (direct)
144:1 (total)
Estimated Average Water Residence Time = range between - three to 150 days
Fisheries - Not available
Public Access: 1 - Public beach - canoe access
Inlets: 4 Outlets: 1
Land Use (percentage):
Water & Pasture
LAND USE (Percentage) Forest Marsh & Open Cultivated Urban
Thomas Lake2 3 50% 50%
North Central Hardwood Forests 6-25%, 14-30% 11-25% 22-50% 2-9Y
Shoreland Zoning: General Development
1 Determined by Dakota SWCD
2 Supplied by city of Eagan.
3 Percent of 40 acre parcels with land use characteristic (Planning
Information Center, 1986).
4 An additional 4,900 acres drain into lake from "Watershed L" from the east,
yielding a "total" watershed area of - 6,200 acres (Eagan, 1990).
5
TABLE 2. HISTORICAL CHRONOLOGY OF THOMAS LAKE, EAGAN, MI NESOTA
1964 - Original Eagan Park Board is formed.
1969 - Park board recommends the Thomas Lake site (among others in an
original park system plan for Eagan.
1969 - Development of Fire Station considered at Thomas Lake site; no action
taken.
1970 - Parks Bond referendum is passed. Original 40 acre parce is proposed
for acquisition on the north side of Thomas Lake. Match ng HUD grant
is awarded for this action.
1973 - Acquisition of 40 acres for Thomas Lake Park is complete
1978 - Two storm sewers are installed into lake. One serves as an inlet to
Thomas Lake from East Thomas Lake (BP-8). One is an inl t from the
pond near the western tip of the lake (BP-13). In the s me year, a
27-inch outlet pipe is constructed on the west end of the lake
connecting the watershed with Heine Pond.
1978 - Thomas Lake rises to about 10 feet higher than its normal level. A
resident's home floods. Decision is made to allow flooding of the park
in order to lower lake level. Twenty three oaks are imp cted.
1979 Residential and school construction continues around Tho as Lake and
the park. Construction this year includes Thomas Lake E ementary
School, Lake Park Shores, and Thomas Lake Heights.
1979 - Minnesota Department of Natural Resources (DNR) stocks Thomas Lake with
walleye fry for harvest; partial winterkill occurs. DN concludes
that Thomas Lake is poor for fishing and fisheries projects in its
present state.
1982 - Robert Dana, prairie expert, is hired to assess the condition of the
Thomas Lake Park prairie lying adjacent to the lake. H identifies
native prairie species and recommends controlled burn every two years.
Burning is set up on a two-year schedule. Shortly after
recommendation, Eagan Garden Club plants native species on-site.
1983 - Inlet from pond BP-12, on the south side of the lake, i constructed.
1985 - Thomas Lake Heights is constructed.
1987 - Grant money is awarded for the development of Thomas Lake Park.
Planned projects include canoe beach. fishing docks, picnic pavilion,
trails, landscaping, and parking lot. Actual construction occurs from
1987 - 1989.
1987-88 -Residential development continues in the watershed including
construction of Thomas Lake Pointe, Thomas Lake Center, and Thomas Lake
Woods.
6
1987 - DNR denies city's permit application to conctri1rt an excavated boat
"lagoon" and launch ramp within park, citing negative impacts to
wildlife and fish.
1989 - Grand Opening of Thomas Lake Pavilion occurs in summer. Phase I park
development is completed.
1989 - Construction of a well water pump house in north end of park begins,
pending approval from the National Park Service and State (grant
administrators).
1989 - City applies for a DNR "C.O.R.E." grant seeking installation of a
fishing pier and lake aeration system.
Notes:
- Information on Thomas Lake is not available before 1969. Many sources were
used to research the lake including: the Dakota Historical Society, Dakota
County Library, and Dakota County Parks. Information such as the history of
the lake's name is not available.
- Very few DNR fisheries projects have been done on Thomas Lake due to the fact
that DNR considers the lake more conducive to wildlife propagation and less
suitable for fisheries management.
7
FIGURE 1. THOMAS LAKE LOCATION MAP
Minnesota's ecoregions note
Northern Minnesota
Wetlands
R d River Valley
Northern Lakes and Forests
North Central
Hardwood Forests
Northern THOMAS LAKE
Glaciated
Plains
•
rittless
rea
Western Corn Belt Plains
8
RESULTS AND DISCUSSION
Water quality data was collected on May 9, June 5, July 13, and August 10, 1989,
in Thomas Lake. Three sampling sites were used: Site 101 in the middle basin
near the park, site 102 in the west basin and site 103 in the east basin (Figure
2). Lake surface samples were collected with an integrated sampler, which is a
PVC tube 6.6 feet (2 meters) in length with an inside diameter of 1.25 inches
(3.2 centimeters). Surface grab samples were collected when shallow depths
occurred. In addition, phytoplankton (algae) samples were collected at all
three sites.
Sampling procedures were employed as described in the MPCA Quality Control
Manual. Laboratory analyses were performed by the laboratory of the Minnesota
Department of Health using U.S. Environmental Protection Agency-approved
methods. Samples were analyzed for nutrients, color, solids, pH, alkalinity,
turbidity, conductivity, chloride, and chlorophyll (Appendix B). Temperature
and dissolved oxygen profiles and Secchi disk transparency measurements were
also taken (Appendix B). Qualitative and semi-quantitative analyses of the
phytoplankton samples were conducted by MPCA staff. Dominant taxa were
quantified as the percent of the total biomass of algae. CLMP Secchi disk
measurements from 1978 were also available for comparison. All data, except the
phytoplankton data, was stored in STORET, the U.S. Environmental Protection
Agency's (EPA) national water quality data bank. The following discussion
assumes that the reader is familiar with basic water quality terminology as used
in the "Citizens' Guide to Lake Protection."
FIGURE 2. THOMAS LAKE BATHYMETRIC MAP
Sampling sites noted
THOMAS _
tiv
PARK
102
.o
101
103
201
THOMAS LAKE
0 1/e
SCALE IN MILES
Key MINNESOTA POLLUTION
CONMOL AGENCY
200 Series CLMP Lake Stations DIVISION Or WATE H OUALI I Y
100 Series--MPCA Lake Stations
OCTOBER 1990
FIGURE 3. THOMAS LAKE WATERSHED MAP
Watershed "L"
/•l^' 'l•~i11
(4,900 Acres)
,CL
i~i!J~ F~kiil R;t
THOMAS LAKE •4..1'11. il. ,l - ~yf'l~♦'
CC ii'ii , i':111. ~ ~ L 'turllA 5
~"'1: I'1 F _ •I,trh rf~ I:J r~~ ` 1 f: '1..~ n`'1~~
;,;:;.1•_i-L-` ",.fA•• ' •K~ ;~w''.•1,~.f ~t--~ •~.1►7,' 1/-111 ..t. 1MMi
Direct Watershed T1 ;i:iti; ! ~rlElror-+^i• iL.V E ll 2~
`1:.:•oi:ro;...~' 'ii: .lli:: r:iIICIII cl.w• \lr• VI 'J;/Nl
(114 Acres) ~.:~ip L.I:~'-,ar.• v rl. ,-i ,,rl ie F.'dSET",;'~u,r Est:r
e -O1./7 • y l ! jr:•li/~a:;r its N,~.. • :'ii'.... _ ,....cgi_.i,
r 1 T r ,Ir„•4r'' : . • '•••W,c. ICL,Iv... n .y . , , _ d
l V • c Lry..Lle x1/1, l,1.'l~ N
~ f -1 it vl x:~ . ~~'S r~u~ ~ ::s+'. cl:'LwwVV~~~" %IYcc1 Y ' .4. .i •
pINMMR/-;• 11..•. , r
t 000OOirrr• Gl P' " •af cL. 111:1 lr•SI f.f: i", r-SO Cl. VX
Watershed "B" ,~i' L.R I;t. I;; AF.. 1 , l af.:l3.gi~~11 11
NotE cl.N ca V ~L.X
d"
f.•f. I ...It l ' L r ,i tr• Coo'`.' Lr•») i !l'
j 4: :k , tt.v. .n.Nyy}) : `4"v V el:v k f• s vl!!i e.:: 1 ~ji L - - \
CL. VJ
f..la c.i,' i• b i=n ; _ S•' i4`^ il, F , 1 :.f :
(1,297 Acres) 1r• i)~L: a.l~ IL- + .
Sii:~ ►E»rri :ill' • - : ~ ' T .c, ° ;•e=.' - , E l , ki; ~tat.',.~
~
r-. CL.rI :.or-SR l eV I CL, II I•• L.p
•'I.~ r i t:.il r 1 wl i ;1`~I! -'v~' Lr.,i i
LP-69 il.f .rte I / ~7/
''!7, fll Kf i pia r'1 li. 1 It j;i;>? Co.
a.IV ,
•.i19, FI d~cl:.vu• a.w~ - r• rri1!. ~ \t ` ct.X
r 1 1'.1 •a~.;u Lr-to' bfaEr Lr.Er lr.ti Lra' 1v-aT I
_.I el.l - nnpk ea.rv eL.1 \ /el. to
. 1 n►-s; I-.'1.711ff~~l i_t
a .Y.:-/~... CL. V _R•f• L• f 51 : v
l f; fO.'-T III"^ i tl:)tlil vll..•I' YYY YYY Cl. 1V X,
*„.p...,• ,Lo-+.e..-lClj-~~Le•,i-t ' i
L iL.V GII VII. • S t:l. 1V
_ J..:,.rl. 7J. 1 . . qp
- ...e,..,7: IXll.iaf'. ;E• 1•.n..,, Lr.n ~~'y11i.Y_.i ~ bl~-`.-l''
AV•.rln-'%.1 'CL. lI-!i r ii .a l/•1, It:• I+'.: •.Ie C1.1 ~ la, .IT
'f:' i' ilr i7.1 r-~. t. •"•li•lil I _ .rw. a:a•
' Mll,t•La•Y ♦ ~'~I' 1 V Cl.l fl.l LI.i,
or.
r I
CL.
Ll il.lll .,.z~•.
Cl. IV I
11. I,1 •I,~••" ~:I:TEX. _ il.11
i : L / I.la 1
EL. Ir (`C K;.;
cl. IV al-IO V •11 / \ - \V Ro' CMOUNT'
Cl- rll
r / J \ LEGEND
cl. v n
rONO•Ni AREAS 0 112
STORM St HERS 1•.411.,) . . . . . .
STORM ,EWERS Ir, ,..dI . . . . . .
SIGN. LIFT STATION 4•.Ilm,l . . . . . . V
STORM LIFT STAIMWIW 041. . . . °
STORM FORCE MAW. . . . . . . . . . . • - MINNESOTA POLLUTION
From: City of Eagan MAJOR OIVISIOXS - CONTnOL AGENCY
Water Quality XpRMAL WATER UM16
Illill WATER LEVEL o DIVISION OF WATE n OUALI TY
Management Plan OVERLAND OIUWA,E ROUTE.. • • • . OCTOBER 1990
11
In-lake Conditions: 1989
The dissolved oxygen and temperature profiles, were taken at each ample site in
Thomas Lake. The temperature profiles suggest that the lake was w 11 mixed on
most dates.
Dissolved oxygen concentrations remained above 5 mg/l (milligrams er liter or
parts per million) throughout the summer in most of the lake. Dis olved oxygen
concentrations did drop below 2 mg/1 near the bottom of the lake during the
August and September dates. This reduction of oxygen in the hypolimnion
indicates that the sediments of the lake exert a significant oxygen demand on
the water. The oxygen is depleted as it is used in the decomposition of organic
matter in the sediments. Its effects are most pronounced during calm periods
when there is little or no oxygen mixed into the hypolimnion. This is a common
occurrence in Minnesota lakes.
Total phosphorus (TP) concentrations (an important nutrient for p ant growth)
averaged approximately 103 Vg/1 (micrograms per liter or parts pe billion) in
the epilimnion (Table 3) during the summer of 1989. This value i very high
compared to concentrations found in a set of representative - min mally
impacted lakes in the North Central Hardwood Forest ecoregion (Ta le 3).
Epilimnetic phosphorus concentrations in Thomas Lake generally ra ged between
70-110 yg/1 during the summer. Spring TP concentrations tended t be lower than
those measured later in the summer. There was no significant difference
between summer mean TP concentrations between the basins.
12
TABLE 3. THOMAS LAKE: AVERAGE SUMMER WATER QUALITY AND TROPHIC STATUS INDICATORS
Based on 1989 epilimnetic data
Typical Range f2or
Parameter Mean NCHF Ecoregion
Total Phosphorus (ug/1) 103 22 - 50
Chlorophyll a (ug/1)
Mean 29 5 21
Maximum 44 7 - 37
Secchi disk (feet) 2.4 4.9 - 10.5
Total Kjeldahl Nitrogen (mg/1) 1.3 0.8 - 1.2
Nitrite + Nitrate-N (mg/1) < 0.01 < 0.01
Alkalinity (mg/1) 70 140 - 195
Color (Pt-Co Units) 23 10 - 20
pH (SU) 9.4 8.6 - 8.8
Chloride (mg/1) 42 4 - 10
Total Suspended Solids (mg/1) 9.6 1 - 3
Total Suspended Inorganic Solids (mg/1) 4.1 1 - 2
Turbidity (NTU) 6.4 1 - 2
Conductivity (umhos/cm) 257 300 - 400
TN:TP Ratio 12:1 26 - 37:1
Trophic Status Indicators: 1989
Carlson Trophic State Percentile1
Index Values NCHF Ecoregion
TP TSIP = 71 -
Chl a TSIC = 64 -
Secchi TSIS = 65 -
Mean (All) TSI = 67 28
1 Relative to approximately 530 assessed lakes in North Central Hardwood
Forests ecoregion, whereby the lower the trophic state (TSI), the higher
the percentile ranking (100 percent level implies lowest TP or deepest Secchi
disk for that ecoregion).
2 Derived from Heiskary and Wilson (1989).
13
The ratio of TN:TP can give an indication as to which nutrient is limiting the
production of algae in the lake. For Thomas Lake, the TN:TP rati averaged
about 12:1. This suggests that nitrogen may be the limiting nutrient in Thomas
Lake at this time. This means that phosphorus concentrations mus be reduced a
lot before it can become the limiting nutrient and, in turn, a reduction in
algae may be realized. The TN:TP ratio is lower than that found in minimally
impacted lakes in this region.
Chlorophyll a concentrations provide an estimate of the amount of algal
production in a lake. During the summer of 1989, chlorophyll a c ncentrations
ranged from 10 Ug/1 to 44 Ug/1 with an average of 29 ug/1. Conce trations
from 10-20 ug/l would be perceived as a mild algal bloom, while c ncentrations
greater than 30 ug/1 would be perceived as a severe nuisance (Hei kary and
Walker, 1988). Both the average and maximum chlorophyll a concentrations for
Thomas Lake are higher than typical values for this region. Chlorophyll a
concentrations were fairly comparable between the basins.
The composition of the phytoplankton (algae) population of Thomas Lake was
determined. The blue-green algae were dominant on all sample dates. Anabena
sp., Oscillatoria sp. and Microcystes sp. were the most common genera of
blue-green algae throughout the summer. It is common in eutroph'c lakes for
blue-green algae to dominate surface blooms late in the summer. Blue-green
algal blooms can produce nuisance condit.i,~ns such as, unsightly mats, odors and
surface scums.
14
Secchi disk transparency is generally a function of the amount of algae in the
water. Suspended sediments or color due to dissolved organics may also reduce
water transparency. Color, averaged 23 Pt-Co Units. Total suspended solids
averaged 9.6 mg/l over the summer. The total suspended solids value is high for
this region. The total suspended solids may serve to limit water transparency
in Thomas Lake. Secchi disk transparency ranged from 1.0 to 3.6 feet and
averaged 2.4 feet during the summer of 1989. These transparency measures low
relative to the typical range for minimally impacted lakes in the North Central
Hardwood Forests ecoregion.
Along with the CLMP transparency measurements, subjective measures of Thomas
Lake's "physical appearance" and "recreational suitability" were made by the
CLMP observer in 1989 (Appendix B). Physical appearance ratings range from
"crystal clear" (Class 1) to "dense algal blooms, odor, etc." (Class 5) and
recreational suitability ratings range from "beautiful, could not be any nicer"
(Class 1) to "no recreation possible" (Class 5) in this rating system
(Heiskary and Wilson, 1988). These subjective measurements provide a relative
basis for evaluating lake conditions relative to Secchi transparency or
chlorophyll a measurements. Data collected in Thomas Lake by the CLMP in 1989
can be used for this purpose. Physical appearance was rated as "definite algal
color" (Class 3) and recreational suitability was rated as "desire to swim
reduced because of algae levels" (Class 4) on most dates.
Turbidity levels are high. This is most likely caused by the suspended
particles (clay, etc.) and algae. Likewise. the total suspended inorganic
solids (i.e., clay) was quite high on selected dates, e.g., May 9 at site 103.
15
This may be caused by inadequate erosion controls. Conductivity ~alues are
fairly typical for lakes in the region. The alkalinity and condu tivity
indicate that Thomas Lake would be considered a moderately hard water lake.
Chloride concentrations are very high and reflect the high amount of runoff from
streets and parking lots in the watershed and the use of de-icing chemicals.
One means to evaluate the trophic status of a lake and to interpret the
relationship between total phosphorus, chlorophyll a and Secchi disk readings
is Carlson's Trophic State Index (TSI, Carlson 1977). This index was developed
from the interrelationships of summer Secchi disk transparency and the
concentrations of surface water chlorophyll a and total phosphorus. TSI values
I
are calculated as follows:
Total phosphorus TSI (TSIP) = 14.42 In (TP) + 4.15
Chlorophyll a TSI (TSIC) = 9.81 In (Chl a) + 30.6
Secchi disk TSI (TSIS) = 60 - 14.41 In (SD)
I
TP and chlorophyll a are in ug/l and Secchi disk transparency is in meters.
TSI values range from 0 (ultra-oligotrophic) to 100 (hypereutrop ic). In this
index, each increase of 10 units represents a doubling of algal biomass.
Average values for trophic variables in Thomas Lake and respective TSIs are
presented in Figure 4. Based on these values, Thomas Lake would be considered
hypereutrophic in condition. The mean TSj of 67 would rank Thom s Lake at the
28th percentile relative to 530 other lakes in the North Central Hardwood
Forests ecoregion. In other words, its TSI value is higher (mor eutrophic)
than 72 percent of the lakes we have assessed in this region. Tie individual
16
FIGURE 4. CARLSON'S TROPHIC STATE INDEX VALUES FOR THOMAS LAKE
TSI relationships based on mean summer data for 1989
Changes in the Biological Condition of Lakes
With Changes in Trophic State
R.E. Carlson
TSI's < 30 Classical oligotrophy: Clear water, oxygen throughout the year
in the hypolimnion, salmonid fisheries in deep lakes.
TSI 30 - 40 Deeper lakes still exhibit classical oligotrophy, but some
shallower lakes will become anoxic in the hypolimnion during the
summer.
.TSI 40 - 50 Water moderately clear, but increasing probability of anoxia in
hypolimnion during the summer.
TSI 50 - 60 Lower boundary of classical eutrophy: Decreased transparency,
anoxic hypolimnia during the summer, macrophyte problems
evident, warm-water fisheries only.
TSI 60 - 70 Dominance of blue-green algae, algal scums probable, extensive
macrophyte problems.
TSI 70 - 80 Heavy algal blooms possible throughout the summer, dense
macrophyte beds, but extent limited by light penetration. Often
would be classified as hypertrophic.
TSI > 80 Algal scums, summer fish kills, few macrophytes, dominance of
rough fish.
OUGOTROPHIC MESOTROPHIC EUTROPHIC HYPEREUTROPHIC
20 25 30 35 40 45 50 SS 60 65 70 75 60
„i..r. >..s>+rrt
TROPHIC STATE
~u`:iE n:s .w:wo
INDEX m
15 10 6 7 6 5 4 3 2 13 1 0.5 0.3
,lair
TRANSPARENCY ,•:::.:;:..::;..::•.•;:-..:a'y: ;f:°t•':^F•'•`.•.. ~A;'y,.,t~:."•.`,,:...~., .
`:r:;:::::. :;•i:::z%:iu::,...:{a~; > .c..e:.
METERS ::•z:<,tr: i:;:• v;•v;- ;;i r. : .xir'.:r::~nwyy: w:a:u,•c, ux•:
0.5 t 2 3 4 S 7 10 15 20 30 40 60 80 100 150
{:j ; ..,a:;f.2.`•: « ;ii'''f,,`--•.• :,cap:;...
CHLOROPHYLL-A :
::z?:;:•;;E> iii^:> > :.i:;. .,:..i ..~.;.'•v::.,.
,:.C•s:.r ,,};..:..:::•¢::Y:,R; .~4•:',~,:::s, y?., 'tiw. :.,.a•+.;' y~y.« ::iia:b{iK<: . .
3 5 7 10 15 20 25 30 40 S0 60 80 100 ISO
TOTAL,
PHOSPHORUS rq :r:....:;>:;w ;;•..Vs....~.w..
After Moore, L. and K. Thornton, (Ed.] 1988. Lake and Reservoir
Restoration Guidance Manual. USEPA. EPA 440/5-88-002.
17
TSI values suggest that the transparency of Thomas Lake is slightly higher than
would be expected based on the total phosphorus measurements that were taken.
Chlorophyll a concentrations are slightly lower than expected based on the
phosphorus concentrations. This could be caused by the high concentration of
suspended sediment (i.e., clay) in the water which will tend to limit the amount
of light available for algal production.
Another means for comparing these three variables is graphically n
scatterplots. Values for Thomas Lake are noted on Figure 5. In eneral, we
note that total phosphorus - chlorophyll a - Secchi transparency relationships
in Thomas Lake are somewhat quite comparable to those observed in other
Minnesota lakes. Figure 5 also suggests that increases in the in lake
phosphorus concentration could result in further declines in the ransparency
and an increase in the amount of algae in Thomas Lake.
Water Quality Trends
Very little data is available for assessing seasonal or long-term trends in the
water quality of Thomas Lake. In terms of seasonal trends, total phosphorus
concentrations were somewhat lower in May as compared to later in the summer.
The increased phosphorus concentration later in the summer could a caused by
internal loading of phosphorus and/or summer storm events. Becau~e the lake is
quite small and shallow and the watershed is quite urbanized, it is likely that
conditions in the lake (in terms of TP and TSS) may change rapidly in response
to storm events.
Secchi disk data from 1978 was available for comparison to the 19 9 data and is
summarized below:
I
18
FIGURE 5. SCATTERPLOTS OF CHLOROPHYLL, SECCHI TRANSPARENCY AND TOTAL PHOSPHORUS
Based on summer mean data from a set of representative lakes from
four ecoregions in Minnesota
Values for Thomas Lake noted:
1101
901
70-
so-
30. v
' THOMAS LAKE
10 .
r-•••
10 30 50 70 90 110 130
TP (ug/1)
21
w 15
s i•. THOMAS LAKE
u •r
ti
3-
10 30 50 70 90 110
Chl a (ug/1)
21 • •
15
u
V THOMAS LAKE
3
10 30 50 70 90 110 1.30
TP (ug/1)
19
Secchi (ft.)
Year # of Obs. Mean Minimum Maximum
1978 16 1.6 1.0 3.0
1989 13 2.4 1.0 3.5
These data do not indicate any long-term trends. It does appear hough that
transparency was no worse in 1989 compared to 1978 and if anythin may have been
slightly better.
The USGS collected water quality data on a number of lakes in Eagan in the
1970s (Ayers et al. 1980) and during the 1980s (Tornes et al. 1989). Thomas
Lake was among those sampled. Although the individual data for each lake were
not included in the reports, summary data were presented. Based on this work,
they reported a mean total phosphorus concentrations of 120 ug/1 1970s) and 130
ug/1 (1980s) for Thomas Lake and they noted that concentrations w re quite
variable between seasons. They also report high chloride values. Blue-green
algae tended to be the dominant type in their work also. In general, the USGS
(1970s to 1980s), Met Council (1980, Appendix 1) and MPCA data fr m 1989 are
rather comparable. No long-term trends are evidenced.
Modeling Summary
Numerous complex mathematical models are available for estimating nutrient and
water budgets for lakes. These models can be used to relate the flow of water
and nutrients from a lake's watershed to observed conditions in the lake.
Alternatively, they may also be used for estimating changes in t e quality of
the lake as a result of altering nutrient inputs to the lake (e. g., changing
20
land uses in the watershed) or altering the flow of amount of water that enters
the lake. To analyze the 1989 quality of Thomas Lake, a recently developed
model - the "Minnesota Lake Eutrophication Analysis Procedure" (MINLEAP) - was
used. This model was developed by MPCA staff based on an analysis of data
collected from a set of representative minimally impacted lakes for each
ecoregion. It is intended to be used as a screening tool for estimating lake
conditions with minimal input data and is described in greater detail in Wilson
and Walker (1989).
Thomas Lake was previously modeled by the city of Eagan using Walker "Pondnet"
model. The Eagan version of "Pondnet" is calibrated for the city of Eagan and
is a useful diagnostic/predictive tool for estimating changes in phosphorus
loads as runoff moves through the numerous ponds in the city. "Pondnet" is not
addressed further in this report.
MINLEAP model results are presented in Tables 4a - 4c. All inputs are the same
for each model run with the exception of watershed area which was changed to
reflect the influence of changing the size of Thomas Lake's watershed via the
city's storm water routing. The three scenarios used were as follows (as
derived from Eagan, 1990 and Dakota SWCD, 1987):
(a) The immediate (or "original") watershed of Thomas Lake which is
approximately 114 acres (46 ha).
(b) Routing of the southern portion cf vatershed "B" through Thomas Lake
for a total watershed area of approximately 1,297 acres (525 ha) and;
(c) Current - includes routing of runoff from watershed "L" (4,900 acres)
and the southern portion of watershed "B" through Thomas Lake, for a
total area of approximately 6,197 acres (2509 ha).
21
Running MINLEAP with these three watershed scenarios helps to place in
perspective the role/significance that increasing the watershed size has upon
the water quality of the lake.
Case 1 (Table 4a) provides and estimate of the condition of the 1 ke when only
its "natural" watershed drained to the lake. Under this conditio , MINLEAP
estimates that the in-lake phosphorus concentration would have be n less than
509 of that measured in 1989. Likewise, chlorophyll would be low r and Secchi
transparency would be higher. The phosphorus load to the lake wo ld be
estimated to be on the order of 11 kg P/year and the water reside ce time (time
it would take to refill the lake if it was empty) would be on the order of 5.5
years.
Case 2 (Table 4b) shows the effect of increasing the watershed to include the
southern portion of "Watershed B" (as noted in Eagan, 1990). Und r this
scenario, the phosphorus load increases about 10 fold to 103 Kg P/year and
reduces the water residence time to about 0.4 yr (approximately 146 days).
In-lake phosphorus concentrations would double under this scenario, chlorophyll
would increase and Secchi transparency would decrease.
Case 3 (Table 4c) is an estimate using the current size of the watershed
according to Eagan (1990). The addition of Watershed "L," as it is referred to,
is 43 times greater in surface area than the original watershed f Thomas Lake.
The water residence time would be reduced further, to about thre days. MINLEAP
estimates the phosphorus load to be on the order of 485 Kg P/yr. This would
result in an in-lake phosphorus concentration of 107 ug/1. This is surprisingly
i
22
TABLE 4a. THOMAS LAKE: MINLEAP MODELING DATA
Based on 114 acre watershed
Minnesota Lake Eutrophication Analysis Procedure
ENTER INPUT VARIABLES
LAKE NAME ? THOMAS
ECOREGION NUMBER 1=NLF,2=CHF,3=WCP,4=NGP ? 2
WATERSHED AREA (HA) /alto, ? 28.6/cyst - y3 L a6 : 7d_ VILAKE SURFACE AREA (HA) ? 17.6 97a e
LAKE MEAN DEPTH (M) ? 1.4
OBSERVED MEAN LAKE TP (UG/L) ? 103
OBSERVED MEAN CHL-A (UG/L) ? 29
OBSERVED MEAN SECCHI (M) ? .73
INPUT DATA:
LAKE NAME =THOMAS ECOREGION= CHF
LAKE AREA = 17.6 HA
WATERSHED AREA (EXCLUDING LAKE) = 28.6 HA
MEAN DEPTH = 1.4 METERS
OBSERVED MEAN TP =,103 UG/L
OBSERVED MEAN CHL-A = 21`9 UG/L
OBSERVED MEAN SECCHI = .73 METERS
:press ENTER to view results>
LAKE = THOMAS ECOREGION = CHF
AVERAGE INFLOW TP = 243.8403 UG/L TOTAL P LOAD = 10.78264 KG/YR
LAKE OUTFLOW = .0442 HM3/YR AREAL WATER LOAD = .25125 M/YR
RESIDENCE TIME = 5.57214 YRS P RETENTION COEF = .8359341
VARIABLE UNITS OBSERVED PREDICTED STD ERROR RESIDUAL T-TEST
TOTAL P (UG/L) 103.00 40.01 15.89 0.41 2.20
CHL-A (UG/L) 29.00 14.43 9.81 0.30 0.96
SECCHI (METERS) 0.73 1.6I 0.72 -0.34 -1.69
NOTE: RESIDUAL = LOG 10 (OBSERVED/PREDICTED)
T-TEST FOR SIGNIFICANT DIFFERENCE BETWEEN OBS. AND PREDICTED
CHLOROPHYLL-A INTERVAL FREQUENCIES (o)
CHL-A PREDICTED PREDICTED PREDICTED
PPB OBSERVED CASE A CASE B CASE C
10 97.61 70.03 63.62 61.61
20 70.38 17.86 19.76 30.26
30 37.75 3.83 5.16 16.10
60 3.96 0.07 0.15 3.59
CASE A = WITHIN-YEAR VARIATION CONSIDERED
CASE B =WITHIN-YEAR + YEAR-TO-YEAR VARIATION CONSIDERED
CASE C = CASE B + MODEL ERROR, CONSIDERED
Ok
23
TABLE 4b. THOMAS LAKE: MINLEAP MODELING DATA
Based on 1,297 acre watershed
Mir r~e.•ot_< Lc-k- Eu rophicatior. Analysis Procedure
ENTER INPUT VARIABLES
LAKE NAME ? THOMAS
ECOREGION NUMBER, i=NLF,2=CHF,3=WCP,4=NGP ? 2 ~
WATERSHED AREA (HA) ? 507.5
LAKE SURFACE AREA (HA) ? 17.6
LAKE MEAN DEPTH (M) ? 1.4
OBSERVED MEAN LAKE TP (UG/L) ? 103
OBSERVED MEAN CHL-A (UG/L) ? 29
OBSERVED MEAN SECCHI (M) ? .73
INPUT DATA:
LAKE NAME =THOMAS ECOREGION=CHF
LAKE AREA = 17.6 HA
WATERSHED AREA (EXCLUDING LAKE) = 507.5 HA
MEAN DEPTH = 1.4 METERS
OBSERVED MEAN TP = 103 UG/L
OBSERVED MEAN CHL-A = 29 UG/L
OBSERVED MEAN SECCHI = .73 METERS
<press ENTER to view results>
LAKE = THOMAS ECOREGION = CHF
AVERAGE INFLOW TP = 154.3559 UG/L TOTAL P LOAD = 102.923 KG/YR
LAKE OUTFLOW = .66679 HM3/YR AREAL WATER LOAD = 3.738579 M/YR
RESIDENCE TIME = .3695317 YRS P RETENTION COEF .4870658
VARIABLE UNITS OBSERVED PREDICTED STD ERROR, RESI UAL T-TEST
TOTAL P (UG/L) 103.00 79.17 21.32 .11 0.83
CHL-A (UG/L) 29.00 39.10 20.71 - .13 -0.50
SECCHI (METERS) 0.73 0.89 0.33 -0.09 -0.51
NOTE: RESIDUAL = LOG10(OBSERVED/PREDICTED)
T-TEST FOR SIGNIFICANT DIFFERENCE BETWEEN OBS. AND PREDICTED
CHLOROPHYLL-A INTERVAL FREQUENCIES M
CHL-A PREDICTED PREDICTED PREDICTED
PPB OBSERVED CASE A CASE B CASE C
10 97.61 99.53 99.18 95.38
20 70.38 87.64 85.73 77.30
30 37.75 62.29 61.38 58.05
60 3.96 12.86 14.77 23.17
CASE A = WITHIN-YEAR VARIATION CONSIDERED
CASE B = WITHIN-YEAR + YEAR-TO-YEAR. VARIATION CONS'DERE
rr,A CZF r = ('ASE B + MODEL ERROR CONtiiLER.Ei
,
24
TABLE 4c. THOMAS LAKE: MINLEAP MODELING DATA
Based on 6,197 acre watershed
Minnesota Lake Eutrophication Analysis Procedure
ENTER INPUT VARIABLES
LAKE NAME ? THOMAS
ECOREGION NUMBER 1=NLF,'2=CHF,3=WCP,4=NGP ? 2
WATERSHED AREA (HA) ? 2491
LAKE SURFACE AREA (HA) ? 17.6
LAKE MEAN DEPTH (M) ? 1.4
OBSERVED MEAN LAKE TP OWL) ? 103
OBSERVED MEAN CHL-A OWL) ? 29
OBSERVED MEAN SECCHi (M) ? .73
INPUT DATA:
LAKE NAME =THOMAS ECOPEGION=CHF
LAKE AREA = 17.6 HA
WATERSHED AREA (EXCLUDING LAKE) = 2491 HA
MEAN DEPTH = 1.4 METERS:
OBSERVED MEAN TP = 103 UG/L
OBSERVED MEAN CHL-A = 29 UG/L
OBSERVED MEAN SECCHI = .73 METERS
<press ENTER to view results>
LAKE = THOMAS ECOREGION = CHF
AVERAGE INFLOW TP = 149.3059 UG/L TOTAL P LOAD = 484.5484 KG/YR
LAKE OUTFLOW = 3.24534 HM3/YR AREAL WATER LOAD = 18.43943 M/YR
RESIDENCE TIME = 7.592425E-02 YRS P RETENTION COEF = .2840014
VARIABLE UNITS OBSERVED PREDICTED STD ERROR RESIDUAL T-TEST
TOTAL P (UG/L) 103.00 106.90 23.10 -0.02 -0.14
CHL-A (UG/L) 29.00 60.61 28.78 -0.32 -1.35
SECCHI (METERS) 0.73 0.69 0.24 0.03 0.16
NOTE: RESIDUAL = LOG10(OBSERVED/PREDICTED)
T-TEST FOR SIGNIFICANT DIFFERENCE BETWEEN OBS. AND PREDICTED
CHLOROPHYLL-A INTERVAL FREQUENCIES
CHL-A PREDICTED PREDICTED PREDICTED
PPB OBSERVED CASE A CASE B CASE C
10 97.61 99.98 99.94 99.17
20 70,38 98.03 97.20 9:,'.10
30 37.75 88.99, 87.11 79.84
60 3.96 41.27 41.93 44.00
CASE A = WITHIN-YEAR VARIATION Cr;iTSIri:~RED
Ct'INV B 3 = WITHIN-S ~E ~ ~ 1.. AF. T Y. EAR- 1~. -JYEA:. 7ARIAT1710 • C`lAtjI~IDER~ E-i,
CASE C = CASE B + .MODEL E RROF COIISIDERED
r, j
25
close to the concentration measured in 1989 of 103 ug/1. The esti ated Secchi
transparency is very close to the observed also. The estimated ch orophyll a
concentration is much higher than observed. This may be caused by the abundant
rooted vegetation in the lake. This also suggests the magnitude of algal blooms
that might occur in the absence of this vegetation.
Goal Setting
The city of Eagan, in their water quality management plan (Eagan 990),
classified Thomas Lake as "Class I - Direct Contact Recreation." The city
notes, however, that Thomas Lake does not currently meet the crit ria. One of
the requirements of this class is a TSI (based on Secchi) not to xceed 55.
This would correspond to a Secchi transparency of about 1.5 m or reater and a
total phosphorus concentration of about 35 ug/1 (Figure 4). In 189, the
average transparency was 0.73 m and total phosphorus concentratio was 103 ug/l.
Corresponding TSI values would be in the 65-70 range.
In view of these values (1989 conditions vs. Class I criteria) it would appear
that a very large reduction in the in-lake phosphorus concentrate n would be
necessary to meet the criteria. The MINLEAP modeling (Tables 4a o 4b) suggests
that it may be very difficult to reduce the in-lake phosphorus co centration
substantially below 1989 levels because of the shallowness of the lake and the
very large size (and subsequently high phosphorus and water loadi g) of its
watershed.
If phosphorus concentrations cannot be reduced substantially, the city of Eagan
may want to consider changing the classification of Thomas Lake to perhaps a
Class II lake. Even then, phosphorus reductions would be necess ry to meet the
26
criteria of that classification (total phosphorus should be below 70 ug/1). At
a minimum, the city should seek to keep the in-lake phosphorus concentrations at
or below 1989 concentrations. Should the phosphorus concentrations increase
and/or the extensive aquatic vegetation is removed, increases in the intensity
and frequency of algal blooms can be expected.
27
I
i
REFERENCES
Arneman, H.F. 1963. Soils of Minnesota. University of Minnesot ,
Agricultural Extension Service and U.S. Department of Agricu ture.
Ayers, M.A., G.A. Payne and M.R. Have. 1980. Effects of urbaniz tion of the
water quality of lakes in Eagan, Minnesota. USGS Wat. Reso r. Invest.
80-71.
Borchert, J.R., G.W. Orning, J. Stinchfield, and L. Maki. 1970. Minnesota's
Lakeshore: resources, development, policy needs. Summary o the
Minnesota Lakeshore Development Study, University of Minneso a, Department
of Geog. and C.U.R.A., Minneapolis, Minnesota.
Carlson, R.E. 1977. A trophic state index for lakes. Limnology and
Oceanography 22:361-369.
City of Eagan. 1990. Water Quality Management Plan.
Dakota SWCD. 1987. Wetland Inventory: Gun Club Lake Watershed anagement
Organization.
Gunard, L. 1985. U.S. Geological Survey. Water Supply Paper 23 0. U.S.G.S.
702 Post Office Building, St. Paul, Minnesota.
Heiskary, S.A. and W.W. Walker. 1988. Developing phosphorus criteria for
Minnesota lakes. Lake Reservoir Management. 4(1):1-10.
Heiskary, S.A. and C.B. Wilson. 1988. Minnesota Lake Water Quality
Assessment. Minnesota Pollution Control Agency, St. Paul, Minnesota.
Heiskary, S.A. and C.B. Wilson. 1989. Regional Nature of lake water quality
across Minnesota. An analysis for improving resource management. Jour. MR
Acad. Sciences 55(1): 71-77.
Minnesota Department of Natural Resources. 1968. An Inventory f Minnesota
Lakes: Bulletin 25. MDNR, St. Paul, Minnesota.
Minnesota Pollution Control Agency, St. Paul, Minnesota and Fres water Society,
Navarre, Minnesota. 1985. A Citizens' Guide to Lake Prote tion.
16 pages.
Minnesota Pollution Control Agency. 1986. Protecting Minnesota's Waters: The
Land Use Connection. MPCA, St. Paul, Minnesota.
Minnesota Pollution Control Agency. 1989. Protecting Water Qua ity in Urban
Areas. MPCA. St. Paul, Minnesota.
National Oceanographic and Atmospheric Administration. 1989. L~cal
Climatological Data. Monthly and Annual Summaries. Ashevi le, North
Carolina.
i
I
28
North American Lake Management Society. 1988. Lake and Reservoir Restoration.
Guidance Manual. Developed for Office of Res. and Dev.-Corvallis ERL and
for Office of Water Criteria and Standards Div. Nonpoint Source Branch.
Prairie, Y.T. and J. Kalff. 1986. Effect of catchment size on phosphorus
export. Water Resource Bulletin 22(3):465-470.
Reckhow, K.H., and J.T. Simpson. 1980. A procedure using modeling and error
analysis for the prediction of the lake phosphorus concentration from land
use information. Can. J. Fish Aquat Sci. 37:1439-1448.
Reckhow, K.H., and S.C. Chapra. 1983. Engineering approaches for lake
management. Volume 1: Data analysis and empirical modeling. Butterworth
Publishers. U.S. EPA.
State Climatology Office. 1989. Unpublished map of hydrologic year
precipitation. Oct. 1988 - Sept. 1989. MDNR Div. of Waters.
Tornes, L.H. 1989. Effect of urban runoff on the quality of lakes in Eagan,
Minnesota. USGS Vat. Resour. Invest. Report 86-4331.
Walker, W.W., Jr. 1986. Empirical methods for predicting eutrophication in
impoundments; Report 4, Phase III: Applications Manual Technical Report
E-18-9 prepared by W.W. Walker Hr. Env. Engr. Concord Mass. for U.S. ACE
Waterways Experiment Station Vicksburg, Mississippi.
Walker, W.V., Jr. 1985. Urban nonpoint source impacts on a surface water
supply. Pages 129-137. Perspectives on Nonpoint Source Pollution.
Proceedings of a national conference. Kansas City, Missouri, May 19-22,
1985. U.S. EPA 440/5-85-01.
Wilson, C.B. 1988. Lake water quality modeling used in Minnesota. Presented
at National Conference on Enhancing State Lake Management Program.
May 12-13, 1988. Chicago, Illinois.
Wilson, C.B. and W.W. Walker. 1989. Development of lake assessment methods
based upon the aquatic ecoregion concept. Lake and Reserv. Manage.
5(2):11-22.
31
~I
LAKE ASSESSMENT PROGRAM (LAP) APPLICATION
The purposes of this application are: (1) to briefly collect info tion about
your lake; (2) determine the need for a water quality study; and (3 determine
the extent of local commitment for -the cooperative efforts entailed in the Lake
Assessment Program. The best candidates will likely be strong in 1 three
areas. ' Feel free to attach additional sheets if necessary.
Name and location of lake: Thomas Lake (BP-12)
Name of interested association, municipality, or other local organization:
City of Eagan
' Contact person, address, phone number:
John VonDeLinde, Parks Superintendent, City of Eagan, 3830 Pilot Knob Road
Eagan, MN 55121 (612) 454-5220
Briefly describe the function of your organization with respect to the lake.
For instance: years organized, projects initiated, membership, etc.
The City of Eagan, through it's Parks and Recreation Department op rates the 56 acre
Thomas Lake Park. Existing facilities include a canoe launch, san blanket, picnic
pavilion and parking; future developments include-fishing piers an observation
decks. The Public Works Dept manages storm water systems affectin the lake.
Are tre other associations, municipalities, etc. which represent the lake's
interest which could/should be included in a LAP program for this lake? Please
specify: name, contact person, address (e.g. beach or sportsman groups).
None known
Vould you be willing to work cooperatively with these organization to protect
or improve the quality of the lake?
N/A
Does your lake currently have water quality problems? If so, please describe.
The City of Eagan is currently formulating a comprehensive water quality plan
to effectively moniter and manage it's water resources. Sampling and study
of this lake is imperative to establishing a sound long-range improvements program.
Vhat do you perceive as the causes of water quality problems in your lake?
The accelerated growth of Eagan and resultant land-use changes is contributing to
water quality degradation in this water body. Likely problem sources
include: erosion, fertilizer runoff, impervious surface runoff and shoreline
disturbance.
Have any water quality studies been completed on your lake in the last?
Yes. MnPCA office has additional information on these studies.
29
APPENDIX A
Lake Assessment Program (LAP) Application
33
APPENDIX B
Thomas Lake Water Quality Data
32
Do you feel a program of this nature is useful for helping your association or
municipality protect or improve the vater quality of your lake?
The LAP would be extremely beneficial to the City's efforts in developing a Water
Quality Management Plan. The City's Citizens Task Force on Water Quality has already
identified this lake as ad high priority for long-range management given it's
noes your lake naveepuCiicpaccess-7 Yoe public beach? No
Does your lake association belong to a county-vide or regional coalition of lake
associations? If so please specify the name and address.
NSA Have Willing
Please check the folloving as they apply: Done to do
Participate in Citizens Lake-Monitoring Program? X
Map and field verify vatershed of lake (with assistance). X
Approach County Extension or Soil Conservation Service regarding X
Service regarding an assessment of land use in the_vatershed.
Field verify lake contour (depth) map. X
Assist in lake vater quality sampling, i.e. provide a boat and an X
operator on 3-4 occasions during the summer.
Conduct periodic tributary sampling, e.g. during storm events (if X X
MPCA funding is available).*.
Work with county zoning officials to insure on-site septic systems X
comply with local ordinances..
Compile a vritten outline of the history of the lake e.g., X
development, vater level, eater quality, etc.
Please return to: Steven Heiskary
MM Pollution Control Agency
Division of Water Quality
Program Development Section
520 Lafayette Road
St. Paul, Minnesota 55155
35 j
APPENDIX 1. THOMAS LAKE WATER QUALITY DATA. MPCA data from STORET.
DATE SITE D TP TKN N2N3 TSS TSIN ALK PH CL COND TURB COLOR CHLA SD SDF PHYS REC
800609 401 1 0.120 1.68 0.05 - 170 0 4 1.3
800807 401 1 0.380 5.60 0.05 - 70 200 - - 0 2 0.7
890509 101 0 0.069,0.98 0.03 3.8 2.4 78 8.3 55 320 4.0 10 9.29 1 2 3.9 3 3
890509 102 0 0.071 1.40 . . 8.2 8.33 1 9 6.2 3 3
890509 103 0 0.079 0.90 . 13.0 10.0 0 4 1.3 3 4
890605 101 0 0.093 1.08 0.01 6.0 4.0 80 8.7 49 2.1 30 9.61 1 1 3.6 2 3
890713 102 0 . . 9.5 . - 43.60 O~7 2.3 3 3
890713 103 0 0.109 1.06 0.01 12.0 6.8 60 9.3 40 7.0 20 30.10 0 7 2.3 3 3
890810 101 0 0.109 1.49 0.01 11.0 1.6 70 9.7 36 10.0 20 33.60 0.6 2.0 4 4
890810 102 0 0.102 1.40 . 9.6 . 28.80 0.7 2.3 4 4
890810 103 0 . . 9.9 . 27.20 0.6 2.0 4 4
Abbreviations and Units
SITE= sampling site ID
DM= sample depth in meters(0=0-2 m integrated)
D= sample depth in feet
TP= total phosphorus in mg/l
TKN= total Kjeldahl nitrogen in mg/l
N2N3= nitrite+nitrate N in mg/l
PH= pH in SU (field)
ALK= alkalinity in mg(lab)
TSS= total suspended solids in /1
TSY= total suspended volatile solids in mg/l
TSIN= total suspended inorganic solids in mg/l
TURK= turbidity in NTU
COND= conductivity in umhos/cm
CL= chloride in mg/l
DO= dissolved oxygen in mg/l
TEMP= temperature in degrees centigrade
SD= Secchi disk in meters
SDF= Secchi disk in feet
CHLA= chlorophyll-a in ug/l
PHYS= physical appearance rating
REC= recreational suitability rating
39
APPENDIX C
MDNR Fisheries Survey Summary
43
APPENDIX D
Location Map of Storm Sewers
36 .
THOMAS LAKE DISSOLVED OXYGEN, TEMPERATURE
AND PHOSPHORUS PROFILE DATA.
DATE SITE D DM DO TEMP TP
800609 401 0 0.0 7.0 19.0
800609 401 1 0.5 6.3 19.5 0.120
800609 401 3 1.0 6.2 19.5
800609 401 4 1.3 6.2 19.5
800807 401 0 0.0 12.0 24.0 .
800807 401 0 0.3 •
800807 401 1 0.6 4.0 23.0 0.380
800807 401 3 1.0 0.5 23.0
800807 401 3 1.0 .
800801 401 4 1.3 0.1 23.0
890509 101 0 0.0 8.8 13.5 0.069
890509 101 3 1.0 9.1 11.7
890509 102 0 0.0 9.6 14.0 0.071
890509 102 3 1.0 9.8 12.1
890509 102 4 1.5 10.6 11.6
890509 103 0 0.0 . 0.079
890605 101 0 0.0 10.2 21.2 0.093
890605 101 3 1.0 10.5 20.4 .
890605 102 0 0.0 11.4 21.5
890605 102 3 1.0 11.4 20.8 .
890605 102 6 2.0 9.0 19.8 .
890605 103 0 0.0 9.6 21.1 .
890605 103 3 1.0 9.7 21.0 ,
890713 102 0 0.0 11.5 28.2
890713 102 3 1.0 10.7 27.0
890713 103 0 0.0 10.1 27.8 0.109
890713 103 3 1.0 10.1 26.8 .
890810 101 0 0.0 13.0 25.6 0.109
890810 101 3 1.0 11.5 23.1 .
890810 102 0 0.0 12.9 25.6 0.102
890810 102 3 1.0 8.8 22.8 .
890810 102 4 1.5 0.3 22.0 .
890810 103 0 0.0 12.3 25.8 .
890810 103 3 1.0 7.2 22.8 .
890906 101 0 0.0 10.8 20.4 .
890906 101 3 1.0 8.3 20.1 .
890906 101 4 1.5 1.8 19.6 .
890906 102 0 0.0 10.7 20.6 .
890906 102 3 1.0 9.4 20.3 .
890906 102 6 2.0 0.2 19.2 .
890906 103 0 0.0 9.3 20.3 .
890906 103 3 1.0 7.0 20.1 .
890906 103 4 1.5 2.0 19.5 .
THOMAS LAKE SECCHI TRANSPARENCY DAT 37
DATE SITE SD SDF PHYS REC
780605 201 0.9 3.0
780612 201 0.8 2.0
780619 201 0.6 2.0 j
780626 201 0.6 2.0
780703 201 0.6 2.0
780710 201 0.5 1.0
780717 201 0.5 1.0
780724 201 0.6 2.0
780731 201 0.8 2.0
780807 201 0.9 3.0
780814 201 0.6 2.0
780821 201 0.5 1.0
780904 201 0.5 1.0
780911 201 0.5 1.0
780918 201 0.5 1.0
780925 201- 0.5 1.0
SITE SECCHI PHYSCON RECSUIT
DATE TIME D FEET 1-5 1-5
890603 1045 0 201 3.50 3 4
890617 0815 0 3.50 3 4
890701 0945 0 2.50 3 4
890724 1930 0 2.50 4 4
890807 1445 0 1.50 3 4
890820 1545 0 1.00 3 4
890908 1845 0 1.50 3 4
Physical Condition
please use the ONE number that best describes the physical condition of the lake w ter at
your sampling site each day that you sample.
i = Crystal clear water
2 - Not quite crystal clear - a little algae present/visible
3 = Definite algal green, yellow, or brown color apparent
4 = High algal levels with limited clarity and/or mild odor apparent
5 = Severely high algae levels with one or more of the following.
- massive floating scums on the lake or washed up on shore
- strong, foul odor
- fish kill (please note the number and types of fish)
i
Suitability for Recreation
Please use the ONE number that best describes vour opinion on how suitable the lake water
is for recreation and aesthetic enjoyment each day that you sample.
1 = Beautiful. could NOT be better
2 = very minor aesthetic problems; excellent for swimming, boating
3 = Swimming and aesthetic enjoyment slightly impaired because of algae love
4 = Desire to swim and level of enjoyment of the lake substantially reduced
because of algae levels (i e, would not swim, but boating is okay)
5 Swimming and aesthetic enjoyment of the lake nearly impossible because df
algae levels
I
41
Enter the report or MENU: ALL
'
PHYSICAL CHARACTERISTICS FOR LAKE: THOMAS
Dominant forest/soil type: NOT AVAILABLE
Size of lake: 56 Acres Shorelength: NA
Maximum depth: NA Median depth: NA
Minnesota Pollution Control Agency Data from 1977-195^c
Secchi disk reading (water clarity): 1.8 feet.
Lake contour map is not available
DEVELOPMENT CHARACTERISTICS FOR LAKE: THOMAS
Shoreland zoning classification: GENERAL DEVELOPMENT
Public accesses in 1996: G
*-k-* PUSH RETURN TO CONTINUE
FISH INFO^^.M" T I ON NOT AVAILABLE
PUSH RETURN FOR PERMIT DATA
PERMIT DATA FOR LAKE THOMAS
SUMMARY OF DNR PERMIT
APPLICATIONS ISSUED OR DENIED AS OF JUNE 1986 FOR LAKE: HOME=+S
NUMBER NUMBER
PERMIT TYPES: ISSUED DENIED
PUBLIC (PROTECTED) WATERS PERMITS
Pipeline 2
Sand blanket 1
GENERAL APPROPRIATION PERMITS
Temporary projects 1
Location of Inlets to Thomas Lake
I ~ THOMAS 186 Q Is~ IS~i:
1 4, BP-14
t6' 2i" I
AxE T•"'LAKE I
APARTMENTS '
400 PARK
1867
I 1
i
Ew M dorm ' 1 I
O ROD~F _ BP-T
*ibp
3 - 538
THOMAS LAKE
TH AS `~I 1
LA~
N z: 1
866 !
704 , - BP-T
71
rcN
03. -
,o - _ 1 651 1
16"IJ.N6. I W ~ ' I
jQ WETT TAP
r-
I
Fromt City of Eagan
47
APPENDIX E
State Climatology Office Data - Precipitation
TOTAL PRECIPITATION AND DEPARTURE FROM NORMALS FOR 1989
HYDROLOGIC YEAR PRECIPITATION
HYDROLOGIC YEAR PRECIPITATION DEPARTURE FROM NORMAL
OCTOBER 1988 - SEPTEMBER 1989 OCTOBER 1988 - SEPTEMBER 1989
0104
.:e
16 16 to 20 -410-9 0 to
2410 20 201o24
4 to 0
291e72 s72 c . 0104
flay N-
'Oe IN0 ~`e
s 16 sti - • 72 241* 2 ► 32
4.4
2010 7 < -4 Ole
s 24 Ole 4
20 l0 21 ► 72
.420
.
Ole 4 ~
241e 20
20 to 72 0-4
610 -4
0 ,t
PREPARED BY, 0%o4 PREPARED BY.
•
••-•;w CLIMATOLOGY OFFICE
DEPARTMENT OF CLIMATOLOGY OFFI RESOURCE:
kul 201o 24 STATE CLIMATOLOGY OFFICE STATE
DEPARTMENT OF NATURAL RESOURCE; DIVISION OF WATERS
~ 1 DIVISION OF WATERS _ •1/e'o
<20 .20.
2410 11- C.! ► 20 ~s 0101 ALLYALUES ARE *1 INCHES
ALLVALUES Ant IN INCHES to -s
•
w
THOMAS LAKE 010-1 THOMAS LAKE
•
..o
21-
201o24
16 to 20 -
-20 v• • 24
• O 21 to2/ <24 .Ilo-• -0 .41e-0 4-0
L
n
z
n6 ~ r
,
~ t
t~
l~ .
j
r W
tx t =
f
t ~
f
}
1 ,
a
r
}
i
Event Proposal:
Motion: Create a new Eagan Performing Arts Community Event
Committee comprized of a minimum of:
1. Three commission members
2. One staff member-
3
Charter:
To support the performing arts (muss ) within
the Eagan community and develop a ommunity
performing arts event. To make acces ible the
performing arts to the young and old esidents
of our community as well as our business
community.
Tasks:
1. Identify a major performing art ommunity
event to occur in 1991-92 timef ame.
2. Perform a feasibility study
a. contracts
b. cost
c. schedule/date
d. location/facility
e. funding/sponsorship
f. promotion/advertizing
g. manpower
h. ticket sales
i. logistics
3. Upon identifying the event, the committe
would develop a plan and stria egy and
play a lead role or a supportin role in
coordinating the efforts.
4. Prepare a recommendation to Cit Council
5. Secure a theater/facility, sign a
contract with the performing art
organization, and host the event.
V
Event Proposal:
Motion: Create a new Eagan Performing Arts Commun ty Event
Committee comprized of a minimum of:
1. Three commission members
2. one staff member
Charter:
To support the performing arts (I Lsi ) within
the Eagan community and develop a ommunity
performing arts event. To make acces ible the
performing arts to the young and old esidents
of our community as well as our business
community.
Tasks:
1. Identify a major performing art ommunity
event to occur in 1991-92 timef ame.
2. Perform a feasibility study
a. contracts
b. cost
c. schedule/date
d. location/facility
e. funding/sponsorship
f. promotion/advertizing
g. manpower
h. ticket sales
i. logistics
3. Upon identifying the event, the committe
would develop a plan and strategy and
play a lead role or a supporting role in
coordinating the efforts.
4. Prepare a recommendation to City Council
5. Secure a theater/facility, sign a
contract with the performing art
organization, and host the event.
JAN.10 '91 13:10 ROSEM06NT AEROSPACE BURNSVILLE P.002
Event Proposal:
Motion: Crate a new Eagan performing Arts Comm ity Event
Committee comprized of a minimum of:
1. Three commission members
2. One staff member
Ch rter:
To support the performing arts (music) within
the Eagan community and develop a community
performing arts event. To make accessible the
performing arts to the young and old residents
of our community as well as our business
community.
Tasks:
1. Identify a major performing art community
event to occur in 1991-92 timeframe.
2. Perform a feasibility study
a. contracts
b. cost
c. schedule/date
d. location/facility
e. funding/sponoorabip
f. promotion/advertiizing
g* manpower
h. ticket sales
i. logistics
3. Upon identifying the event, the committe
would develop a plan and Strategy and
play a lead role or a supporting role in
coordinating the efforts.
4. Prepare a recommendation to Ci y Council
5. Secure a theater/facility, sign a
contract with the performing art
organization, and host the event.
January 4, 1990
r
TO: Eagan Parks and Recreation Department
& Eagan Advisory Parks and Recreation Commissioners
FM: George H. Kubik, Chairperson-Eagan Advisory Parks and Recreation Commis ion
SUBJ: Draft Proposal for Natural Resources Mission Statement and Proposal to Am nd -
Charter for Eagan Advisory Parks and Recreation Commission
As we move into the new decade of the 1990's, the City of Eagan and its citizens ar
expressing increased interest in the natural resources which surround them. A stro g message
is being sent! As representatives of the citizens of Eagan, we need to direct increas d
attention to addressing our natural resources in a strategic and anticipatory manner. The need
for increased emphasis on natural resource coordination, cooperation and strategic tanning is
of vital importance to both present and future generations.
In this spirit, it is hereby proposed that the mission of the Eagan Advisory Parks an
Recreation Commission be amended to include responsibility for the preservation an
enhancement of the natural resources of the City of Eagan. The following is an initial draft
intended to describe one possible framework for this activity.
PROPOSED AMENDMENT: NATURAL RESOURCES MISSION STATEMENT
EAGAN ADVISORY PARKS AND RECREATION COMMISSION
DRAFT AMENDMENT FOR DISCUSSION
PROPOSED ACTIONS:
(1) To change the name of the Eagan Advisory Parks and Recreation Commission
From: Eagan Advisory Parks and Recreation Commission
To: Eagan Advisory Parks, Recreation and Natural Resources Commi sion
(2) To amend the statement of mission of the Eagan Advisory Parks and Recreation
Commission to include responsibility for the preservation and enhancement of the
natural resources of the City of Eagan.
The mission statement could be worded in such a manner as to incorporate he
challenge that accompanies the responsibility for the future of natural reso rces irT the
City of Eagan. Suggested wording could state:
The mission of the Eagan Advisory Parks,_~@creatlpn and,
Natural Resources Commission Is tOkeer a resent and J ~
4~~v future a rations of the City of Eagan byQ
mans our rich heritage of fish, wildlife, waters,
wetlands, forests, prairies, minerals, public lands and of or
natural resources, In order. to preserve and enhance our
environment and quality of life.
-1-
' January 4, 1990
The attendant natural resource responsibilities would include the following:
A. Review development proposals and city activities for their impact(s) on the natural
resources of the City of Eagan. Make recommendations to the City Council
concerning impacts or concerns involving natural resources of Eagan.
C. Coordinate natural resource issues, plans and functions with other City
departments, commissions and appointed groups. Coordinate with other public and
private entities having regulatory authority or formal involvement wit the
natural resources of the City of Eagan.
D. Develop and maintain a strategic master plan(s) for the natural resources of the
City of Eagan. Said plan(s) will address:
(1) The current status and historical baselines of Eagan natural resour es;
(2) Assessment of current natural resource systems
(including strength/weakness/opportunity/threat analysis); and,
(3) Strategic assessment of natural resource goals, objectives and
opportunities for the City of Eagan.
E. Provide community direction and focus for natural resource issues, plan and
policies impacting the City of Eagan. Develop citizen involvement in natural
resource programs and activities. Coordinate Eagan natural resource programs
and activities with other natural resource programs, interest groups arid private
parties.
F. Provide leadership in maintaining and enhancing the natural resources o the city of
Eagan.
(3) To establish and maintain a Natural Resources Standing Committee, and such other
committees as may be necessary, to conduct the natural resource duties an
responsibilities set forth herein.
(Note: It is imperative that any proposed changes to the mission statement of the Eagan
Advisory Parks and Recreation Commission be presented to the City Council and
thoroughly reviewed and coordinated with other City Departments, commissions and
appointed groups. Among the issues that should be addressed are:
A. The additional staff resources of the city that will be required to suppo and
conduct this activity.
B. Funding„ sources and funding levels for master planning and other natural resource
related activities (e.g., for city staff or consultants).
C. Changes that must be made in City laws, regulations, policies, or state ents to
accommodate this proposed mission amendment.)
-2-
Janu ry 4, 1990
I have not had the opportunity to discuss these recommendations and consideration with the
City staff or other Commission members. Thus, the document may be a little rough around the
edges. Please review this document carefully and I encourage you to offer any suggestions for
improvement or change.
Sincerely,
(ex'otr
George H. Kubik
-3-