HomeMy WebLinkAbout5.a. Rosemount Storm Damage ReportCITY OF ROSEMOUNT
EXECUTIVE SUMMARY FOR ACTION
CITY COUNCIL MEETING DATE: JULY 18, 2000
t
AGENDA: ROSEMOUNT STORM DAMAGE REPORT
AGENDA SECTION:
DEPT. HEADS REPORT
PREPARED BY: THOMAS D. BURT, CITY ADMINISTRATOR
AGENDA NO:
5.A.
ATTACHMENTS: MEMOS, EVERMOOR STORMWATER
APPROVED BY:
REVIEW
Attached are the current reports from each department concerning storm damage in the City of Rosemount.
FEMA requests separate claim reports for each site, including labor.
McAndrews Road has been open to traffic since Sunday. Hawkins Pond pumping will probably be completed
by Tuesday, July 18. Fahey Avenue will remain closed for about ten days.
WSB & Associates, Inc. reviewed the Evermoor Development Area Stormwater System as it relates to the
design in view of the recent 11 inches of rain received in a few hours. WSB reviewed the Comprehensive
Stormwater Management Plan and the Westwood Professional Services Evermoor analysis for conformance
with reasonable engineering design methods. They were found to be acceptable from the City's stormwater
management philosophy, as well as sound engineering principles.
Rosemount is uniquely challenged because of the number of landlocked basins it has. The City has started to
implement the stormwater plan to develop outlets from some of the landlocked basins, and plans to continue
that process as development occurs. The City is currently requiring positive overland overflows and adequate
separation for basement floors above the pond high water levels to minimize the potential of residential and
commercial flooding.
RECOMMENDED ACTION: Informational only.
COUNCIL ACTION:
MEMORANDUM
DATE: JULY 17, 2000
TO: TOM BURT, CITY ADMINISTRATOR
FROM: DAN FICK, CITY ENGINEER/PUBLIC WORKS DIRECTOR
SUBJECT: STORM CLEAN -UP
While the major storm related work is nearing completion, significant minor work remains to be
done. Summarized below is the status of the major storm damage sites.
FAHEY AVENUE — Contracted repair work is scheduled to begin this week and cost about
$15,000 to complete. Fahey Avenue will remain closed for approximately ten days.
HAWKINS POND — Repair of the sanitary lift station and pumping of the pond are anticipated
to be completed on Tuesday, July 18, 2000.
CSAH 38/McANDREWS ROAD — McAndrews Road was opened to traffic on Sunday, July
16, 2000. Pumping started on Thursday, July 13, 2000 and is now complete. Pumping of the
pond near the Marcotte residence started on Monday, July 17, 2000 and is anticipated to last for
two days.
With completion of the major repair projects, the focus now changes to the minor areas. A
complete damage assessment survey has yet to be completed and we are aware of erosion damage
to the Erickson Pond area. To -date, the total storm damage born by the City has been estimated
at $500,000. Dakota County, however, will attempt to use State Aid disaster funds to pay for the
pumping of McAndrews Road.
TO: Tom Burt, City Admin.
FROM: Scott Aker, Fire Chief
RE: Storm Impact on Fire Department
DATE: 7112/2000
During the weekend storm the Fire Department responded to six(6) calls.
Three(3) of those calls could be attributed directly to the storm.
Power Lines Down - - -(2 Calls) 17 Firefighters 35.75 Hours
Sand Bagging - - -(1 Call) 15 Firefighters 107.5 Hours
Lakeville Fire - - -- Mutual Aid
MEMORANDUM
TO: Tom Burt, City Administrator
FROM: Dan Schultz, Parks and Recreation Director
DATE: June 12, 2000
RE: Impact of storms and high water from July 7 and 8 of 2000
The storms and high water did not have a significant impact on the parks and trails system
throughout the city. The visible damage in the parks includes a few downed trees, minor wash
out areas of gravel, ag -lime and new sod. Also due to the water being pumped from Hawkins
Pond into Twin Puddles Park, the park will be temporarily taken offline and scheduled
activities will be relocated to another park.
The Community Center had some water enter the building with no permanent damage. The
electronic reader sign has been out of commission since approximately 10:00 am on Saturday,
July 8, 2000. It will take one week before a repair crew can come out and determine if the
problems are related to the weekend storms.
MEMORANDUM
TO: Dan Fick, Public Works Director
Cindy Dorniden, Public Works Secretary
FROM: Gary D. Kalstabakken
Chief of Police/Emergency Manager
DATE: July 11, 2000
SUBJECT: Documentation of Storm Work
It appears that there will be a presidential declaration of Dakota County as a disaster area
as a result of the rains and flooding of July 7 and 8. In order to ensure reimbursement for
eligible expenses, it is important that all storm related costs are tracked from the start.
Attached are forms from Federal Emergency Management that were used following the
1998 storms. Please utilize these forms to document expenses as they occur for this
storm, too. A meeting for eligible cities will be held in the next week or two, if the forms
have changed I will get you the new forms to use.
When tracking expenses each separate job site requires its own paper work. FEMA
recommends that a separate file be started immediately for each job site. Then the
appropriate forms are completed for each site separately. The sites that I am aware of
include:
1. Hawkins Pond/Lift Station
2. Fahey Avenue
3. McAndrews Road and Shannon Parkway
4. Rural Residential - Gravel Roadways (Although this encompasses
several roads throughout the city I suggest this be tracked as one
project at this time pending FEMA approval)
5. Debris Clearance
When completing the paperwork, each worker's time must be attributed to a specific
project. For example, if AJ worked 6 hours at Hawkins Pond and 2 hours at
McAndrews/Shannon, he must be listed in the file for both sites' Labor Record.
In order to track expenses other than labor costs more easily, the code for all purchase
orders related to the storm should be coded under line item 101 4XXXX 01 439.
If you have any questions, please check with me.
Cc Tom Burt
Jeff May
JUL -18 -2000 14 18
WSB
& Associates, Inc.
WSB 8 ASSOCIATES INC.
8441 Wayzata Boulevard, Suite 350
Minneapolis, MN 55426
tel: 763 -541 -4800
fax: 763 - 541 -1700
To: Ms. Alysox Morris, Water Resource Engineer
City of Rosemount
From: Bret A. Weiss, P.E.
WSB & Associates, Inc.
Date: July 18, 2000
Re: Evermoor Development Area Stormwater System
WSB Project No. 1005-140
7635411700 P.02i08
B.A. Miaelueedt. P.E
Bret A. Weiss, P.B.
Peter R. Wilknbtin& P.B.
Donald W. Sterna. RE
Ronald B. Stay, P.E.
Memerandum
I am writing this memorandum to address the public comments regarding stormwater issues from the
recent heavy rainfall that were presented to the City at the July 11 Planning Commission meeting.
Many of the comments were directed to the Evermoor area, however, some were general in nature.
Backeround
The Evermoor development area and Birger Pond drainage district encompasses approximately 500 and
1,000 acres, respectively. The Evermoor subdivision is completely contained within the Birger Pond
drainage boundary. A hydrologic analysis of the Birger Pond drainage district has been undertaken over
the past years by the City and other consultants, and has most recently been studied as a part of the
development of the Rosemount Comprehensive Stormwater Plan. This Comprehensive Stormwater
Management Plan was prepared by Bonestroo, Rosene, Anderlik and Associates, a consulting firm hired
by the City of Rosemount.
During the review of the preliminary plat for the Evermoor subdivision, the developer's engineer,
Westwood Professional Services, re- analyzed the actual stormwater conditions in this area with regard
to ponding and storm sewer construction as they related to their development. WSB & Associates, as
a reviewing agent for the City ofRosemount, reviewed both the Bonestroo Comprehensive Stormwater
Management Plan and the Westwood Professional Services Evermoor analysis for conformance with
reasonable engineering design methods. Many comments were addressed back and forth between
Westwood and WSB to arrive at a system which we perceive to be acceptable from the City's
stormwater management philosophy, as well as sound engineering principles.
Simultaneous to the development of the Evermoor preliminary plat, the Birger Pond lift station and
forcemain project was initiated. This project incorporated the development of a five cubic foot per
second (cfs) pump outlet from Birger Pond along Diamond Path to Wensmann Pond. From that point,
Wensmann Pond would discharge into Shannon Pond which is located at the corner of 160" Street and
Shannon Parkway through an existing outlet. Shannon Pond is currently a large sand bottom, Iandlocked
basin with no outlet. In the future, it is anticipated that this pond will discharge to Apple Valley or
Minneapolis 9 St. Cloud
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EQUAL OPPORTUNITY EMPLOYER
JIJL -18 -2000 14:1e WSB & ASSOCIATES INC. ?635411 ?00 P.03/o8-
Ms. Alyson Morris
Water Resource Engineer
City of Rosemount
July 18, 2000
Page 2
possibly, easterly to the Mississippi River, however, at this time, the pond is able to utilize evaporation
and infiltration.
The City of Rosemount is uniquely challenged in the development of stormwater ponding facilities and
corresponding outlets due to the presence of pothole ponding areas intermixed with flat topography. The
development area is located on the west side of town with the Minnesota River located on the far eastern
border. The development ofpositive gravity outfalls for the development area is very difficult to achieve
and results in the creation of many landlocked basins. The City has started to implement the stormwater
plan to develop outlets from some of the landlocked basins, and plans to continue that process as
development occurs. The City is currently requiring positive overland overflows and adequate
separation for basement floors above the pond high water levels to minimi the potential of residential
and commercial flooding.
Response to Questions
We would offer the following responses to questions that were addressed at the July 11, 2000 Planning
Commission meeting:
1. Question: Are the stormwater ponds for the project adequate? The common concern was
that the undeveloped site was flooded and creating problems for the Marcottes.
Response: The Evermoor site is currently undergoing grading operations along the west side
of Shannon Parkway and is in the initial stages of that grading operation. Many
of the proposed ponding areas have not been created to date due to the early stage
of the grading operation. The completion of grading and development ofthe site
will actually reduce the number of acres draining to the Marcotte Pond. The
grading that has been completed to date actually reduced the amount of storm
water discharging to the Marootte Pond through the creation of a new pond,
which further accentuates how much storm water actually fell on the site during
this storm.
2. Question: Why can't the lift station at Mamotte Pond be installed during the Phase 1
improvements? There is a problem there now, and future development will
further the problem.
Response: Originally, the forcemain piping system from the proposed lift station was
intended to be extended through the northern portion of the Evermoor
development site. Since that area will not be developed in the year 2000, (only
grading operations occurring), it did not make sense to design the pipe to be
placed in that location. Further, it is not anticipated with the minimal amount of
development that will be able to occur in the year 2000, that any significant
FitWPW M1W5-.r M77JW -& .wpf
JUL -18 -2000 14:19
Ms. Atyson Morris
Water Resource Engineer
City of Rosemount
July 18, 2000
Page 3
WSB 8 ASSOCIATES INC. ?635411 ?00 P.04i08
increase in drainage to the Marcotte Pond would occur. Because of the
significant rainfall event, we are in the process of evaluating the installation of
the forcemain and the design of the lift Station to install those improvements yet
this year.
3. Question: Is the Birger Pond Lift Station adequate to accommodate the inflows to the pond?
The pumps were turned offon Saturday because Wensmann Pond, a downstream
outlet was very high.
Response: As was discussed earlier, the Birger Pond lift station was designed to pump
directly into Wensmann Pond without creating issues for the Wensmann Pond
residents. However, it is the City's discretion to shut down the lift station if the
Wensmann Pond elevation is high and the maj ority of the water has been pumped
out of Birger Pond. The storage volume within Birger Pond is extensive and is
not likely to be fully utilized until the entire drainage district area is developed,
including the installation of additional storm sewer connections from areas
southeast and. north of Birger Pond The installed outlet of 5 cfs is so small
compared to the amount of water discharging to Birger Pond that shutting down
the pump for a short period of time will not have a significant affect on the high
water elevation. We do not anticipate that the pond will reach the high water
elevation for many years into the future.
4. Question: Why aren't storm sewer systems designed to handle events as large as last
weekend? In the past thirteen years we have had several storms that exceed the
100 -year design flood.
Response: As can be seen from the attached information, this storm in the Rosemount area
was extremely large and uncharacteristic of even the anticipated 1 % chance of
occurrence rainfall events. There has been much effort put into the cost
effectiveness of designing a storm sewer system for different rainfall events.
Typically, the storm sewer systems in streets are designed to accommodate a 10-
year retum frequency event storm, which is necessary in order to allow for safe
passage on our roads and highways. It was further determined that ponds and
storage facilities could be constructed within a reasonable cost to accommodate
runoff from the 100 -year critical event storm without a structural inundation.
This design storm is the design standard for almost all cities in Minnesota.
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JUL -18 -2000 14 =19 WSB & ASSOCIATES INC. ?635411 ?00 P.05i08
M& Alyson Morris
Water Resource Engineer
City of Rosemount
July 18, 2000
Page 4
S. Question: Does the removal of the vegetation generate more runoff to the Marcotte
property?
Response: It is true that removal of vegetation can increase the runoff rate to ponding areas
due to reducing the amount of wetting and absorption from the plant materials.
However, other factors such as soil compaction, roughness of the soil surface,
time since it last rained and other factors would likely play a greater role. It is
unlikely the removal of vegetation was a significant factor in exacerbating the
problems experienced.
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JUL -18 -2000 14 :19 WSB & ASSOCIATES INC. ?635411 ?00 P.06/08
RAINFALL IN MINNEAPOLIS -ST. PAUL METROPOLffAN AREA
FOR DURATIONS FROM 30 MINUTES TO 24 HOURS AND
CHANCES OF OCCURRENCE PER YEAR RANGING FROM I% TO 99%
Data Taken from U.S. Department of Commerce - Weather Bureau
Technical Paper No. 40 - Dated May, 1961
Chance of 24-;Hour 12 -Hour 6-Hour > 3 -Hour 2 -Hour 1 -Hour 30 Minutes
Occurrence
99+%
2.3
2.0
1.7
1.5
1.4
1.2
0.9
50%
2.8
2.4
2.1
1.9
1.7
1.4
1.1
20 °/u
3.6
3.1
2.7
2.3
2.2
1.8
1 A
10 %
4.2
3.7
3.1
2.6
2.5
2.1
1.7
4 %
4.6
4.2
3.5
3.0
2.8
2.3
1.9
2%
5.3
4.6
4.0
3.4
3.1
2.7
2.1
1 %0
5.9
5.0
4.4
3.8
3.5
2.9
2.4.
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WSB Project No. 106S.11 Page 9
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JUL -18 -2000 14:19 WSB B ASSOCIATES INC.
Torrential Rains Douse South Metro - July 7-10, 2000
7635411700 P.08i08
rage i ui c
Torrential Rains Douse South Metro
July 7 -10, 2000
Torrential rains fell upon the Twinc Cities
metropolitan area during the wakend of July 7
10.
The spate of severe weather begin during the
morning of Friday, July 7 when severe storms
rumbled through the east metro. tigh winds, hail,
and possible tornadoes led to significant property
damage.
The south metro, specifically fl a city of Eagan,
received an extraordinary amount of precipitation
later on the 7th, and during the ealdymorning
hours of Saturday, July 8. Over eight inches of rain
fell in a three to five hour span amss a small area
of northern Dakota county. The climatological
probability of receiving eight inches of rain in a
five hour period for a given location in the
metropolitan area, in a givenyM is far less than
9
s
7
6
a
4
Z
s
1
0
inches
Prepared by: Stale Climatology Ot6ce. DNR• Waters
Data provided by: Dakota Sol and Water Conservation District
Metmpol'aan Mosquho Control District
An additional two to three inches of rain drenched National Weather S ervice
already sodden neighborhoods during the evening
of July 8 and the early morning of Sunday, July 9. Light rainfall fell again late in the late evening
of July 9 and the early morning hours of Monday, July 10. The highest reported weekend rainfall
total was 11.33 inches in soutl>tean,Eagan.
The heavy rains led to extensive damage in some south metro communities. Serious urban
flooding was commonplace, and severe erosion was reported in many areas. One life was lost in a
flood - related incident.
W SI radar- based-_R i JLita emo -Jul 3
WSI .bra based precipitation estimate - July. 9
WSl r b.StS.qd...Prc?.pata#io� ._ July, 10
(revised 7 111/00)
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Return to the Climate Journal
m4wb;soils.uttm.edu
URL: hnp: / /elinwc =u.cftId odownslifflub .
Last modified: July 11. 2000
n16_ — i1 « «.i.1CM A^f1A UA.— T ^ '7111If%A
Rainfall Totals
n(5( M 4 ..
If You Suffered Damage From The June -July Floods
You May Be Eligible For
State, and Federal Disaster Assistance
You may be eligible to receive FEMA and State benefits if you live in Dakota,. Fillmore,
Houston, and Mower Counties which received a Presidential disaster declaration. If you
have insurance coverage, but still have unmet disaster - related needs, you may also be
eligible.
Assistance that may be available includes:
* Disaster Housing Grants to cover temporary rent or make essential repairs to your
home.
* U.S. Small Business Administration loans to repair homes, replace personal
property and assist businesses.
* Grants for serious needs not met by other programs.
To receive assistance available under the Presidential Disaster Declaration,
you need to apply. This may be done by calling:
Toll-Free Teleregistration
.1(800) 462 -9029
For those who use TDD:1(800) 462 -7585
These numbers are open from 8 a.m. to 6 p.m. daily.
Before you register, it is helpful to have the following information ready:
* Your current phone number and address
* Your address at the time of the disaster
* Your Social Security number
* A list of damages and losses you suffered
* Good directions to the location of the damaged property
* The name of your insurance company and your policy number
If you have insurance, please call your agent prior to maldng application.
(Please see reverse side for information about disaster assistance programs)
DISASTER ASSISTANCE PROGRAM INFORMATION
S ..
Individuals and small businesses who suffered damages may be eligible for as_ sistance from:- °FEMA,
.y
other federal 'agencies,' State of Minnesota, and voluntary agencies. The assistance` programs are
available to those located in Dakota; Fillmore, Huston and Mower Counties which have been "designated
as major disaster areas by President Clinton.
Federal Emergency Management Agency Programs
DISASTER HOUSING ASSISTANCE: Housing assistance to individuals and families whose
permanent homes were damaged or destroyed by the storm or flood. Types of aid include grants for:
(1) alternate rental housing; (2) emergency repairs needed to make a residence habitable; and (3)
mortgage or rental assistance in cases where the disaster has caused extreme economic hardship. Funds
are also available for mitigation measures to minimize the effects of future disasters.
INDIVIDUAL AND FAMILY GRANT PROGRAM: Provides grants to individuals and. families to
meet serious disaster- related needs and necessary expenses not covered by insurance or other federal,
state or voluntary agency disaster assistance programs.
DISASTER UNEMPLOYMENT ASSISTANCE: Provides weekly benefits to those individuals out
of work due to the disaster, including self - employed persons, farm owners, and others not covered under
regular unemployment benefits.
Small Business Administration Programs
HOME/PERSONAL PROPERTY DISASTER LOANS: Disaster loans to homeowners and renters
for restoring or replacing underinsured or uninsured disaster - damaged real and personal property are
available in the declared county. Funds are also available for mitigation measures to minimize the
effects of future disasters.
BUSINESS DISASTER LOANS: Disaster loans to repair or replace destroyed or damaged business
facilities, inventory, machinery, equipment, etc., not covered by insurance. These loans are available to
large and small businesses in the declared county. Loans also may be available only to small businesses
for working capital to assist them during the disaster recovery period. These loans are available in
declared and contiguous counties.
Other Agency Programs
TAX ASSISTANCE: Federal: The Internal Revenue Service (IRS) allows underinsured or uninsured
casualty losses that were suffered on home, personal property and household goods to be deducted on
income tax returns. Amended returns may be filed for a previous year's filing so that disaster victims
can receive a tax refund. Call the IRS at 1 800 829 -1040.
FARM ASSISTANCE: Emergency loans or grants to farmers who were operating and managing a
farm at the time of the disaster. Loans are limited to the amount necessary to compensate for actual
losses to essential property and/or production capacity.
i
July 18, 2000
Mayor Busho and City Council Members
City of Rosemount
2875 145` St W
Rosemount, MN 55068
Dear Mayor Busho and City Council Members,
In view of the recent rains and the damage and expenses that homeowners and the city
had to endure because of the storm sewer run off and the flooding of holding ponds, we
are asking the city and their consulting engineers from WSB to review the studies and
ensure that there is sufficient capacity to hold the water, or in the case of our pond, that
the lift station pump gets put in before any further development occurs on the Kelley
Trust property. We also want to be sure that there is sufficient capacity in these ponds to
hold the water without causing damage to homes, trees, and surrounding property.
We would like to be assured that sufficient study has been completed to understand the
volume and capacity of the locations that these ponds are being "lifted to" so we are
assured that during a heavy rainfall, the pumps will remain on and not be shut down. We
understand that the Birger Pond pumping was shut down during the rains on July 8 -9,
2000 and much of the Kelley property, plus our pond's lift station are scheduled to go to
the Birger Pond. Who has the authority to shut these pumps down during a heavy rain?
What is the documented process they use to make the decision to shut a pump down?
We think you should reexamine the hydrologist report so you fully understand the
amount of water that will run off into ponds from any new development. Are these
holding ponds really designed to hold the necessary runoff that comes with homes,
driveways, roads, etc? This should not be based on old hundred - year -old flood statistics.
It seems to rain like this every few years. We had the "Super Flood" in 1987 and that
was just 13 years ago. There should be a cushion of capacity in the ponds for the unusual
rains that seem to be coming more often. The design diverts water and then assumes lift
stations can take the water and move it to a "safer" area. There is the potential for loss of
electricity during these storms and lift stations not functioning during this period. What
arrangements does the city have to get back up generators to these ponds?
The nine -inch rain from July 7, 2000 and the flooding of the homes around Hawkins
pond shows how quickly water can rise when the area all around it has been developed.
We need to insure that this does not happen to anyone else.
Let's take the time right now to learn from some of our flooding and that of our
neighbors in Eagan. We need to look at the density issue very closely and how it relates
to runoff. If the reports look flawed, let's fix things before we go any further.
We are enclosing a copy of a letter that we gave to the city and developer on Monday,
July 10, 2000 to try to get resolution to our already existing problem and a copy of the
letter that we gave to the members of the Planning Commission on July 11, 2000.
Thank you for your careful consideration on this.
Sincerely,
Ken and Faye Marcotte
12931 Shannon Parkway
Rosemount, MN 55068
651 -423 -5024
fax: 651- 322 -5584
email: kmarcotte@auswest.net
July 4, 2000
Homer Tompkins Tom Burt
Contractor Property Developers Company City Administrator
7100 Northland Circle Ste 108 City of Rosemount
Minneapolis, MN 55428 Rosemount, MN 55068
This is a formal notice that we have an eminent problem relating to the run off from the
Evermoor (Kelley Trust) Development directly south of our home. We are expecting an
immediate resolution to this problem and you will be held accountable for any damages
that we are receiving.
We believe a lift station should have been put in our pond before the earth was disturbed
and the grading started on the property. We had this discussion with the city on many
occasions because of our concerns that our pond would not accommodate any additional
water and they assured us that a lift station was going in.
Homer Tompkins' excavator advised him that they had not disturbed anything that should
cause run off to our land. He advised him incorrectly. We have video showing the run
off and wash outs coming down the hill to our property and it is coming directly from the
new basins that were created that are overflowing and flowing down the hill directly into
our pond. You can see all the brown sand and dirt in the water of our pond all along the
back third of it. It has washed right through the silt fence. It has also caused our pond to
go well beyond the water easement and it has flooded our yard and also the protected
wetland behind our home. The storm drain had water rushing through it fifteen hours
- after the rains had stopped. tonig e h I expect Nwe help gandbagging on f our
h and it is raining agar
Monday to keep it out of our home.
We were advised that you could get a pump but did not have enough hose to divert the
water. We suggest using PVC and pumping it up over the hill to flow towards Berger
Pond. We need immediate pumping to save irreplaceable one hundred year old oak trees
that are under water, plus extensive landscaping, and hopefully keep the water from
getting into our home and ruining things. We also request that you immediately check
t h e new basins to make sure they are not weakened; because if they give way, we will
have an immediate wall of water and we wont have time to� sand
ho back the runoff from
the city to block the storm drain and sandbag it by th
that area.
We would also like both the developer and the city to get the lift station in before any
further grading is done. We also suggest looking at the design to make sure it is
engineered correctly so the retention ponds hold the water on the property and that they
can accommodate rains like we had the last few days without flooding the homes that
will be built around them or the surrounding properties. The city should not have to
spend the weekend sandbagging and pumping out homes.
Thank you for your immediate response to this problem.
A L , Mfait c:v f fC_
Ken and Faye Marcotte
07 11-- OOA11 :23 RCVD
July 11, 2000
Planning Commission
City of Rosemount
2875 145' St W
Rosemount, MN 55058
07- 11- 00A11 :23 RCVD
07- 11 -00A11 3
Dear Commissioners,
We are sending this letter because Ken is out of town on business and Faye has a
business meeting that may make her late for the public hearing on the proposed design
changes to the Evermoor (Kelley Trust) Development.
Before an agreement is entered into to separate units, increase units, and build a larger
association building, we think you should reexamine the hydrologist report so you fully
understand the amount of water that will run off into ponds from this development. Are
these holding ponds really designed to hold the necessary runoff that comes with homes,
driveways, roads, etc? This should not be based on old hundred - year -old flood statistics.
It seems to rain like this every few years. We had the "Super Flood" in 1987 and that
was just 13 years ago. There should be a cushion of capacity in the ponds for the unusual
rains that seem to be coming more often. The design diverts water and then assumes lift
stations can take the water and move it to a "safer" area. There is the potential for loss of
electricity during these storms and lift stations not functioning during this period. What
arrangements does the city have to get back up generators to these ponds?
The nine -inch rain from July 7, 2000 and the flooding of the homes around Hawkins
pond shows how quickly water can rise when the area all around it has been developed.
We need to insure that this does not happen to anyone else.
We have a water retention pond on our property that also is an example of more run off
than these ponds were designed to hold. We have water corning into the pond from the
storm sewers and also coming down the hill from the Kelly property. It has gone well
beyond the city easement and has flooded extensive landscaping and irreplaceable one -
hundred- year -old oak trees. This is before any homes, driveways, and streets have been
built. We have been told that the ponds over by Shannon Park Elementary flow into our
pond. This appears to be close to the area that is requesting additional units and a larger
building. How will this retention pond handle that runoff? Right now the city is trying
to find a pump and hose large enough to get the water out of our back yard and back into
the easement. In the meantime, we have lost landscaping and we risk losing these
valuable trees and further rains will result in damage to our home. We thought much
foresight and planning went into these developments to protect our valuable environment.
Let's take the time right now to learn from some of our flooding and that of our
neighbors in Eagan. We need to look at the density issue very closely and how it relates
to runoff. Don't approve more units until we are certain we can adequately handle what
already is planned. If the reports look flawed, let's fix things before we go any further.
e
We are enclosing a copy of a letter that we gave to the city and developer earlier on
Monday, July 10, 2000 to try to get resolution to our already existing problem. Even
though the city knew about our flooding as early as Saturday morning, they have been
unable to get a pump and hose to our property yet to start the pumping operation. This
shows that it is not a quick fix to even locate pumps during times like this. We need to
do very careful planning so we learn from these situations and prevent them in the future.
We should cease all activity until we have done a reevaluation of the size of the ponds so
that everyone is assured that the Kelley property will hold all its runoff on its property
without damaging existing homes and property or future homes to be built. We're certain
you don't want another Hawkin's pond issue.
Thank you for your careful consideration on this.
Sincerely,
1�e /a i2n e jCZz l� Ga
Ken and Faye Marcotte
12931 Shannon Parkway
Rosemount, MN 55068
651- 423 -5024
fax: 651 - 3225584
email: kmarcotte(�rt�uswest.net
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