CAS-03_MINNETONKA MIDDLE SCHOOL WEST / DENNIS CLARK PLANNING CASE 06-03Minnesota Department of Natural Resources
November 20, 2006
DNR Waters, 1200 Warner Road, St. Paul, MN 55106 RECEIVED
Phone: (651) 772-7910 Fax: (651) 772-7977 NOV 2 2 2006
Mike Condon, Building & Grounds Supervisor
Minnetonka West Middle School
Independent School District 276
6421 Hazeltine Blvd.
Excelsior, Minnesota 55331
CITY OF CHANHASSEN
RE: SATISFACTORY COMPLETION OF RESTORATION ORDER, MINNETONKA WEST
MIDDLE SCHOOL, PUBLIC WATER WETLAND #10-132, CARVER COUNTY
Dear Mr. Condon:
The actions you have taken to remove the sediment that had formed a delta in Public Water Wetland
#10-132 and to install features on the middle school grounds as well as on the slope above the
wetland to prevent sediment from reaching this Wetland in the future have been determined to be
satisfactory based on site inspections and conversations with City of Chanhassen and Carver SWCD
staff.
Thank you for your cooperation in this matter. Please feel free to call me if you have any questions.
Sincerely,
Julie C. Ekman
Area Hydrologist
c: DNR Conservation Officer, Jackie Glaser
DNR Enforcement Supervisor, Scott Carlson
DNR Wetland Enforcement Officer, Marty Book
City of Chanhassen, Don Asleson
Carver SWCD, Mike Wanous
Riley -Purgatory -Bluff Creek WD, Bob Obenneyer
St. Paul PW Permits Unit
DNR Information: 651-296-6157 • 1-888-646-6367 • TI'Y:651-296-5484 • 1-800-657-3929
An Equal Opportunity Employer
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Conservation Officer
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570 W. 78th St, #2001
Chanhassen, MN 55317
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STATE OF MINNESOTA
DEPARTMENT OF NATURAL
RESOURCES
ENFORCEMENT DIVISION
RESTORATION ORDER EXTENSION
RECEIVED
JUL 19 2006
CITY OF CHANHASSEN
NOTICE OF RESTORATION ORDER COMPLETION DATE CHANGE
LANDOWNER: Independent School District 276
C/O Mike Condon, Mtka West Middle School Buildings and Grounds Sup.
CEASE AND DESIST ORDER NUMBER: N/A
RESTORATION ORDER DATE: October 26, 2005
RESTORATION COMPLETION DATE: May 31, 2006
The restoration completion date for all restoration work required by the Restoration
Order listed above has been changed. By agreement of the Local Government Unit, Soil
and Water Conservation District, and the Enforcement authority the completion date
listed above is changed to July 31, 2006. All required restoration work must be
completed by this date. Failure to comply with Restoration Order is a misdemeanor.
CONSERVATION OFFICER: Jacqueline Glaser
Signature: Q^''( t
Date: July 18, 2006
RETAIN A COPY AND SUBMIT COPIES TO: LANDOWNER, LGU, SWCD
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Minnesota Department of Natural Resources
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Conservation Officer
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Jackie Glaser
570 W. 78th St, #2001
Chanhassen, MN 55317
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STATE OF MINNESOTA
DEPARTMENT OF NATURAL
RESOURCES
ENFORCEMENT DIVISION
RESTORATION ORDER EXTENSION
NOTICE OF RESTORATION ORDER COMPLETION DATE CHANGE
LANDOWNER: Independent School District 276
c/o Mike Condon, Mtka West Middle School Buildings and Grounds Supervisor
CEASE AND DESIST ORDER NUMBER: N/A
RESTORATION ORDER DATE: October 26, 2005
RESTORATION COMPLETION DATE: May 31, 2006
The restoration completion date for all restoration work required by the Restoration
Order listed above has been changed. By agreement of the Local Government Unit, Soil
and Water Conservation District, and the Enforcement authority the completion date
listed above is changed to June 31, 2006. Afoating silt curtain is to be placed
immediately as listed in the Restoration Order. All required restoration work must be
completed by this date. Failure to comply with Restoration Order is a misdemeanor.
CONSERVATION OFFICER: Jacqueline Glaser
Signature: 9,v� Y-'�'( -Ys/
Date: November 15, 2005
Copies submitted to
Landowner St. Paul PW Permits Unit
DNR WEO, Marty Book City of Chanhassen, Don Asleson
DNR Hydrologist, Julie Ekman Carver SWCD, Mike Wanous
DNR Enforcement Sup, Scott Carlson Riley -Purgatory -Bluff Creek Watershed District
Larson Engineering of Minnesota
3524 Labore Road
White Bear Lake, MN 55110-5100
MAY. -9.06
Mr. Don Asleson
City of Chanhassen
7700 Market Boulevard
P.O. Box 147
Chanhassen, MN 55371
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3524 Labore Rwd
White Bear Lake, MN 55110-5100
651.481.9120 Fax: 651.481.9201
w Aarsonengr.com
Project:
Reported to:
GENERAL:
PRE -CONSTRUCTION CONFERENCE
RECEIVED
MAY 10 2006
CITY OF CHANHASSEN
Minnetonka Public Schools
Date: April 27, 2006
2006 Wetland Restoration
Minnetonka, Minnesota
File No. 12066013.000
Mike Condon
cc: Chip Hentges
Minnetonka Public Schools
Dennis Clark
5621 County Road 101
Jim Stenger
Minnetonka, MN 55345
Mark Becker
Don Asleson
On April 27, 2006 a pre -construction conference was held at Minnetonka Middle School West
in Chanhassen, MN. The purpose of this meeting was to coordinate efforts of all parties
involved, to discuss responsibilities, and establish an understanding of the contract documents,
safety requirements, and schedule. The following parties were in attendance:
Dennis Clark, Property Owner
Chip Hentges, Carver SWCD
Jim Stenger, DMJ Corporation
Bert Nelson, Larson Engineering
Mark Becker, ISD 276
Roger Pocta, Larson Engineering
Michael Murphy, Larson Engineering
Don Asleson, City of Chanhassen
The overall work schedule and construction procedures were discussed and some of the main
points were as follows:
1. The Contractor and Owner have signed the contracts and they have been distributed to all
parties.
2. Larson Engineering has received the Certificate of Insurance and Workman's
Compensation Certificate from the Contractor.
3. The Contractor was directed toward the pay request form located in the project
specifications. Based upon the rapid construction process, it is anticipated that only one
request for payment will be needed and the pay request will be for payment in full.
Payment retainage will not be withheld under this scenario.
4. Material submittals need to be completed and submitted for approval from Larson
Engineering.
5. The following Schedule of Work was discussed and determined: Work begins May 1' and
all restoration must be completed prior to June 30, 2006. The extent of the sediment
removal shall take place from the silt curtain to a point determined through aerial
photography from information to be received from the Carver SWCD. This information
will be passed on to Larson Engineering and the Contractor.
6. Erosion control blankets must be added as part of restoration of the sediment removal from
the water's edge to a point of existing rip -rap which has been washed down to the lower
portion of the sediment plume.
7. Removal of trees near the south side of Dennis Clark's driveway will take place to allow
construction equipment to access the sediment. Stumps will not be removed to maintain
root structure to help the existing soils remain in place during storm events.
8. Chip Hentges, Carver SWCD, has been made aware of the construction schedule as he will
be the contact with the Department of Natural Resources. He will notify the DNR of the
work schedule.
9. Mark Becker, Jim Stenger, Roger Pocta, Bert Nelson, and Mike Murphy reviewed the work
performed 4/21/06 by Michael Scott Construction at the Minnetonka Middle School West
project to reduce the impact of the 18" PVC pipe daylighting on the embankment of the
west side of the property. Improvements were suggested and will be implemented by
Larson Engineering and Michael Scott Construction. Improvements include placing sand
bags to reduce the flow under the wood baffle added to a catch basin which diverts flow
from the 18" PVC pipe. Also, placing an 18" — 90° bend at end of the 18" PVC pipe where
daylighting, and adding a riser section extending upward to an elevation 2' below the rim of
a catch basin located just southwest of the lowest door of the school. The sand bags will be
added the morning of 4/28/06 and the pipe work is planned for the morning of 5/2/06.
REMARKS:
This report summarizes the information presented at the pre -construction meeting. The parties
present were responsive to the discussions and good cooperation throughout the project is
anticipated.
If there are any questions, please contact our office.
LLaarso_n Engineering, Inc.
Michael A. Murphy, f E.
Project Manager
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MINNETONKA PUBLIC SCHOOLS
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17000 LAKE STREET EXTENSION
MINNETONKA, MINNESOTA 55345
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Civil Engineer:
Michael A. Murphy, F.E.
Larson Engineering of Minnesota
3524 Labore Road
White Bear Lake, MPH; 55110
Tel: 651.481.9120
Fax: 651.481.9201
mmurphy@larsommn.com
Surveyor:
Daniel L. Thurmes, L.S.
Cornerstone Land Surveying, Inc.
200 East Chestnut Street
Stillwater, MN 55082
Tel: 651.275.8969
Fax: 651.275.8976
dlt-csls@mcleodusa.net
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BENCHMARKS:
ELEVATIONS BASED ON TOPOGRAPHIC SURVEY BY CLARK
ENGINEERING DATED AUG. 14, 1996. THE RIM ELEVATION OF
THE CATCH BASINS AS SHOWN ON THE SURVEY WERE USED AS
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PART OF THE SW 1/4 OF THE NW 1/4 OF SECTION 3, Tl 16, R23,
CARVER COUNTY,MN
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THE ORIENTATION OF THIS BEARING SYSTEM ISASSUMED
FIELDWORK WAS PEFORMED MAY. 7, 2005
TOPOGRAPHIC FEATURES WERE SHOT TO THE BEST OF OUR ABILITIES DESPITE THICK
FOLIAGE.
A GOPHER STATE ONE CALL UTILITY DESIGN LOCATE WAS INITIATED ON THIS SITE.
THE UTILITIES SHOWN HEREON WERE FIELD LOCATE PER VISIBLE STRUCTURE AND
GOPHER STATE ONE CALL MARKINGS WHERE POSSIBLE. CITY AND UTILITY AS -BUILT
PLANS WERE RELIED ON FOR OTHER INFORMATION. ADDITIONAL UTILITIES OF
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Daniel L. Thurmes Registration No: 25718
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MINNETONKA PUBLIC SCHOOLS
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6421 Hazeltine Boulevard
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MINNETONKA, MINNESOTA 55345
INDEX OF DRAWINGS
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PROJECT CONTACTS
Civil Engineer:
Michael A. Murphy, P.E.
Larson Engineering of Minnesota
3524 Labore Road
White Bear Lake, MN 55110
Tel: 651.481.9120
Fax: 651.481.9201
mmurphy@larsommn.com
Surveyor:
Daniel L. Thurmes, L.S.
Cornerstone Land Surveying, Inc.
200 East Chestnut Street
Stillwater, MN 55082
Tel: 651.275.8969
Fax: 651.275.8976
dlt-csls@mcleodusa.net
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BENCHMARKS:
ELEVATIONS BASED ON TOPOGRAPHIC SURVEY BY CLARK
ENGINEERING DATED AUG. 14, 1996. THE RIM ELEVATION OF
THE CATCH BASINS AS SHOWN ON THE SURVEY WERE USED AS
BENCH MARKS.
EXISTING LEGAL DESCRIPTION:
PART OF THE SW 1/4 OF THE NW 1/4 OF SECTION 3, Tl 16, R23,
CARVER COUNTY,MN
SURVEY NOTES:
THE ORIENTATION OF THIS BEARING SYSTEM ISASSUMED
FIELDWORK WAS PEFORMED MAY. 7, 2005
TOPOGRAPHIC FEATURES WERE SHOT TO THE BEST OF OUR ABILITIES DESPITE THICK
FOLIAGE.
A GOPHER STATE ONE CALL UTILITY DESIGN LOCATE WAS INITIATED ON THIS SITE.
THE UTILITIES SHOWN HEREON WERE FIELD LOCATE PER VISIBLE STRUCTURE AND
GOPHER STATE ONE CALL MARKINGS WHERE POSSIBLE. CITY AND UTILITY AS -BUILT
PLANS WERE RELIED ON FOR OTHER INFORMATION. ADDITIONAL UTILITIES OF
WHICH WE ARE UNAWARE MAY EXIST.
0 20 40
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CALL BEFORE YOU DIG!
Gopher State One Call
TWIN CITY AREA: 651-454-0002
TOLLFREE: 1-800-252-1166
Ian was prepared
supervision, and
Land Surveyor
e of MINNESOTA-
----
INNESOTA.
'- --- --- ---
Daniel L. Thurmes Regis ration No: 25718
Date: -5-1-1 -05---
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X COMPACTED CUT VOLUME:
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RAW FILL VOLUME:
COMPACTED FILL VOLUME:
TOTAL FILL VOLUME:
NOTE: DEPENDING UPON CONFIGURATION, ATTACH FABRIC TO WIRE MESH
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NOT TO SCALE
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ORIGINAL SURFACE MODEL:
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CUT COMPACTION FACTOR:
FILL COMPACTION FACTOR:
RAW CUT VOLUME:
X COMPACTED CUT VOLUME:
TOTAL CUT VOLUME:
RAW FILL VOLUME:
COMPACTED FILL VOLUME:
TOTAL FILL VOLUME:
NOTE: DEPENDING UPON CONFIGURATION, ATTACH FABRIC TO WIRE MESH
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SILTATION FENCE
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EXISTING
PROPOSED
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738.15 cu yd
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Minnesota Department of Natural Resources
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Conservation Officer
Jackie Glaser
570 W. 78th St, #2001
Chanhassen, MN 55317
CI4y of C. ai use.,
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7700 Mv.-0jBlvd
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Larson Engineering of Minnesota
3524 Labore Road
White Bear Lake, MN 55110-5100
651.481.9120 Fax: 651.481.9201
w .Iarsonengr.com
Larson
i
June 29, 2005
Ms. Lori Haak
Water Resources Coordinator
City of Chanhassen
7700 Market Blvd.
P.O. Box 147
Chanhassen, MN 55317
RE: Minnetonka West Erosion Restoration
Dear Lori:
RECE vel) -N
JUN 3 0 2005
"^'paEN PLANNING DEPT
We are in receipt of your e-mail dated June 22, 2005 regarding four questions related to the
subject project. We have calculated some of the information and I will present it in the order
listed on the e-mail.
1. Could you send me the calcs for the current design?
We have performed the design calculations and show them on the attached drawing. The
maximum flow of the two lines entering the northern catch basin is a combination of 4.63
cfs and 15.54 cfs for a total of 20.17 cfs. A maximum flow for the 12" steel pipe exiting the
northern catch basin down to the state highway 41 roadway ditch enclosure is 15.66 cfs.
The 12" pipe obviously is the controlling volume.
2. Why was the 18" pipe between catch basin #1 and the existing catch basin to the north
connected?
The 12" steel pipe coming from the east toward the northern catch basin was the original
installation. When heavy rainfall would occur, water would back up on the roof of the
school building. Subsequently, a 6" PVC pipe was connected to the catch basin near the
school building and routed to the location where the embankment erosion is occurring.
However, the 6" diameter pipe was unable to handle the roof water and a number of years
ago, an 18" PVC pipe was installed to replace the 6" pipe. The increased pipe size resolved
the roof water problem, but it caused the present erosion condition. The purpose of
terminating the 18" outflow pipe was to eliminate embankment erosion. Installing a new
catch basin over the 18" pipe and rerouting the water into the existing north catch basin
utilizes the existing 12" steel pipe without increasing its carrying capacity which is adequate
to drain roof water off the building.
3. The depth of the gate valve along TH-41 needs to be confirmed. A minimum of 7.5 feet of
cover is required over the watermain. I understand that you will be following up with the
engineering department to get this information.
4. Have you run the numbers for the 24" CMP under Mr. Clark's driveway? Withthe change
in timing, we will need to make sure a 24" pipe can handle it.
Our calculations indicate that the 24" CMP located beneath Mr. Clark's driveway would
handle a maximum flow of 26.78 efs. The discharge water from the Minnetonka School
outlet pipe and structure would be 15.66 cfs. This would permit an additional 1 I cfs from
the surrounding area to flow through the CMP culvert beneath Mr. Clark's driveway.
We have included several site drawings for your review and further comment as needed I have
an 8:30 am meeting scheduled with Xcel Energy for Thursday and I am in the process of trying
to schedule a meeting with MN -DOT and will notify you as progress develops.
We have also calculated the volume of material that will be needed to fill the erosion created
from the school property. That information is also on the drawing and a total calculated volume
of 738.15 cubic feet will be needed to restore this area.
W. Pocta, P.E.
t Manager
cc: Mike Condon, Minnetonka Public Schools
E \CivittProjecls - 21MSMnnetoi*a Public SchoolslMinnelonl ablest M,Wle Soho `uM a west erasion G29-05. duc
PUBLIC WATERS RESTORATION Cease and Desist
j�,� AND REPLACEMENT ORDER Order Number:
��a N.A.
Pursuant to Minnesota Statutes, Section 103G.2372, and Minnesota Rules, part 6115.0255, the Commissioner of Natural
Resources hereby orders Independent School District 276, clo Mike Condon, Minnetonka West Middle School Buildings and
Grounds Supervisor, to restore the bed of Public Water # 10-132W located in: SEA SE%4 NEV4, Section 4, Township 116 North,
Range 23 West, Carver County.
Findings of Fact:
1. On Friday, September 23, 2005, Conservation Officer Jacqueline Glaser and Area Hydrologist Julie Ekman inspected
the northwest shoreline of Public Water Wetland 10-132 and saw that a large amount of sediment had washed into this
basin blanketing an area approximately 60 feet wide, 25 feet waterward, and of an unknown thickness. See attached
photos. Water was presently carrying more sediment into this basin during the site visit Further inspection of the area
showed that sediment has been entering this water body via a drainage ditch adjacent to Hwy 41 as well as overland via
gullies. Ms. Ekman's conversations with Lori Haak, City of Chanhassen Water Resources Coordinator and Mike
Condon, the Middle School Buildings and Grounds Supervisor, revealed that the major source of the runoff carrying
the sediment is the School District property to the north of basin 10-132W.
2. Approximately 1500 square feet of this basin has been inundated with sediment most likely containing pollutants
typically found in urban storrnwater runoff.
3. It was apparent from Ms. Ekman's conversations with Mr. Condon that the sediment discharge was entirely
unintentional.
Order:
1. You shall accomplish restoration by doing the following: Floating silt curtain will be placed on the waterward side of
the sediment across the entire plume to contain the area The sediment will be removed entirely from the basin.
Potential re -sedimentation of this basin will be prevented by installation and construction of effective stormwater
management methods. Email correspondence from Aaron Mlynek, Carver SWCD Urban Conservation Technician,
detailing storrnwater, erosion control, and sediment control recommendations are attached.
2. The restoration work described above must be completed as follows: Floating silt curtain is to be placed immediately;
sediment removal will take place in conjunction with the construction of stormwater management methods or by May
31, 2006, whichever is earlier.
3. You must contact Area Hydrologist, Julie Ekman at (651) 772-7910 within seven days of completing the work
required by this Order. The culmination of successful restoration is the issuance of a Certificate ojSatisjactory
Restoration.
This Order is final and binding on you, unless within 30 days of the date on which it was served on you, you appeal the terms and
conditions of this restoration order to the commissioner by filing a written request for review. Please mail any such request to:
DNR Waters, Violations Coordinator, 500 Lafayette Rd., St. Paul, MN 55155-4032
Violation of this order is a misdemeanor.
ys 10 06 os
DNR ation Officer Badge Number Da e
Jacqueline Glaser
Issuance Record: In person r or, by certified mail on it,/db/os
Date
Attachments
C: DNR Enforcement Supervisor, Scott Carlson City of Chanhassen, Don Asleson _
DNR Wetland Enforcement Officer, Marty Book Carver SWCD, Mike Wanous
DNR Area Hydrologist, Julie Ei man Riley -Purgatory -Bluff Creek Watershed District, Bob Obermeyer
St. Paul PW Permits Unit C C i r 7 2005
The SWCD has reviewed the proposed restoration and stormwater management
plan for the Minnetonka Middle School West submitted by Larson
Engineering dated 06.17.05. Please review and consider the following
suggestions.
Stormwater
1. Consider reducing the discharge to the 12" steel pipe by installing
a flow diverter / splitter to take a maximum of Scfs to the 18" PVC.
This would reduce the discharge of the 12" steel pipe to around 10cfs.
2. Consider installing a sump for the northern catch basin. The sump
should provide some energy dissipation.
3. Grade a berm for diverting water from shedding over the top of the
restored gulley area and into the CB's.
Erosion Control
1. The erosion control fabric details need to be specified. For the
area exposed in the Hwy 41 ditch a turf re -enforcement mat is needed.
The turf re -enforcement mat (TRM) specification must meet the expected
shear stress of the channel. For example, if the expected shear stress
is less than 3.2 lbs / ft2 a C350 Vmax3 from North American Green (or
comparable product) could be used.
2. The restored gulley area must be blanketed with 100% coconut fiber
blanket following seeding.
3. If possible, provide a smooth transition terrace area in the grading
of the slope.
4. If a flow diverter / splitter is possible and 5cfs or less is
planned to discharge from CB -1 over the slope a slight channel /
waterway must be provided and a TRM is needed for the channel area.
5. Riprap will be needed for the 18" PVC if the 5cfs will be
discharged. Using riprap specified for the velocity of the possible
discharge from CB -1 rock checks or ribbons should be provided in the
channel. The ribbons should span the width of the channel with the
overflow area in the center of the rock. The rock check should be 24
inches wide and 1 foot high. Space this checks every 40 feet, with the
first one 40 feet from the top of slope. (There will be 7 checks).
6. Riprap is needed at the 24" FE on the south side of the private
drive as erosion is occurring south of the FE to the wetland area.
Sediment Control
1. The silt fence protection around the inlets should be replaced with
dandy bags, silt sack inlet protection, wimco inlet controls or ESS
Brothers inlet controls or similar products.
2. A temporary rock weeper (2 feet high, 4 feet long, the width of the
channel) is needed to back up the silt fence in the ditch just north of
the 24" FE. This rock could be salvaged and used as the energy
dissipation for the surge basin.
3. Silt fence used should be machine sliced monofilament geotextile,
Chanhassen type 1 specifications.
4. Install a floating silt curtain immediately in the wetland area to contain
sediment discharge to wetland and for removal of sediment in the near future.
5. Remove accumulated sediment in the wetland area and restore wetland
area following restoration or the gulley.
;71
,Kk IV\
/Gaoo
Pqlm',4 �xff,
ti
Larson Engineering of Minnesota
3524 Labore Road
While Bear Lake, MN 55110-5100
651.481.9120 Fax: 651.481.9201
w .Iarsonengr.com
5 Larson
June 29, 2005
Ms. Lori Haak
Water Resources Coordinator
City of Chanhassen
7700 Market Blvd.
P.O. Box 147
Chanhassen, MN 55317
RE: Minnetonka West Erosion Restoration
Dear Lori:
pECENEDssrt
JUN 3 0 2005
N PLANNING DEPT
We are in receipt of your e-mail dated June 22, 2005 regarding four questions related to the
subject project. We have calculated some of the information and I will present it in the order
listed on the e-mail.
1. Could you send me the calcs for the current design?
We have performed the design calculations and show them on the attached drawing. The
maximum flow of the two lines entering the northern catch basin is a combination of 4.63
cfs and 15.54 cfs for a total of 20.17 cfs. A maximum flow for the 12" steel pipe exiting the
northern catch basin down to the state highway 41 roadway ditch enclosure is 15.66 cfs.
The 12" pipe obviously is the controlling volume.
2. Why was the 18" pipe between catch basin #1 and the existing catch basin to the north
connected?
The 12" steel pipe coming from the east toward the northern catch basin was the original
installation. When heavy rainfall would occur, water would back up on the roof of the
school building. Subsequently, a 6" PVC pipe was connected to the catch basin near the
school building and routed to the location where the embankment erosion is occurring.
However, the 6" diameter pipe was unable to handle the roof water and a number of years
ago, an 18" PVC pipe was installed to replace the 6" pipe. The increased pipe size resolved
the roof water problem, but it caused the present erosion condition. The purpose of
terminating the 18" outflow pipe was to eliminate embankment erosion. Installing a new
catch basin over the 18" pipe and rerouting the water into the existing north catch basin
utilizes the existing 12" steel pipe without increasing its carrying capacity which is adequate
to drain roof water off the building.
3. The depth of the gate valve along TH41 needs to be confirmed. A minimum of 7.5 feet of
cover is required over the watermain. I understand that you will be following up with the
engineering department to get this information.
4. Have you run the numbers for the 24" CMP under Mr. Clark's driveway? With the change
in timing, we will need to make sure a 24" pipe can handle it.
Our calculations indicate that the 24" CMP located beneath Mr. Clark's driveway would
handle a maximum flow of 26.78 cfs. The discharge water from the Minnetonka School
outlet pipe and structure would be 15.66 efs. This would permit an additional I 1 cfs from
the surrounding area to flow through the CMP culvert beneath Mr. Clark's driveway.
We have included several site drawings for your review and further comment as needed. I have
an 8:30 am meeting scheduled with Xcel Energy for Thursday and I am in the process of trying
to schedule a meeting with MN -DOT and will notify you as progress develops.
We have also calculated the volume of material that will be needed to fill the erosion created
from the school property. That information is also on the drawing and a total calculated volume
of 738.15 cubic feet will be needed to restore this area.
W. Pocta, P.E.
t Manager
cc: Mike Condon, Minnetonka Public Schools
E:\Di Wroje s - 2005VAirmel Pudic Sdw Mirvieionpe West M We Sdn rM west erosion 6-29-05.a