1993-08-30 Drainage Albertville & Frankfort Special AgreementMEYER-R01-fUN, INC.
ENG/A'EERS-LAND SURVEYORS 1111 Nvey. 25 N., Buffalo, Mirn.55313 Phone 612- 682-1781
August 30, 1993
Lori Vanderhider, District Agreements Engineer
Minnesota Department of Transportation, District 3
1991 Industrial Park Road
Baxter, 14N 56401
RE: Albertville and Frankfort Drainage
S.P. 8680-126 (I-94)
Special Agreement
Dear Ms. Vanderhider:
Enclosed are the preliminary plans, cost estimates and rationale
for the above -referenced project for your review and approval. Once
MnDot's comments have.been received, final Plans and Specifications
will be completed.
Although this project may appear to have been dro unusually wet summer and resulting high water conditions ped, the
the seasonal autumgaited the Cit
n rains have reignited � prior to
y s concern.
Considering the specific public benefits in conjunction with
Possible property damage and losses to Interstate 94 and local
businesses, the City formally requests that this project be allowed
to proceed this construction season. It is our understanding that
this type of project can not proceed until a special agreement
contract has been signed by all parties involved. If the State is
unable to approve this project and funding this season, the City
would like to propose, if any way possible, that the City would
cover all costs initially with the understanding that MnDOT would
contribute a MnDOT determined amount at a later date.
Meyer-Rohlin; Inc. and the city of Albertville are looking forward
to working with MnDOT on this project. If you have any questions,
please do not hesitate to call me.
Sincerely,
MEYER-ROHLIN, INC.
Ronald Geurts
Engineer
cc: E-9001-H
City of Albertville
Frankfort Township
Thore P. Meyer, Professional Engineer Robert Rohlin, Licensed Land Surveyor
GOAL
The goal of this project is to eliminate existing flooding conditions in
the northeast portion of the city of Albertville.
PROBLEM
Several typical rainfall events in
saturate and flood the surrounding
local streets and Interstate 94.
quick succession have the ability to
areas, including homes, businesses,
GIVEN
The watershed's three contributing areas can be segregated as follows:
Total Benefited
Area Wetlands Area
1. Albertville
Area 1 68.01 17.41 50.60
Area II 12.21 4.68 7.53
80.22 22.09 58.13
2. Frankfort*
Potter's Commercial Park 16.12 6.07 10.05
Green Haven Estates 38.92
Cemetery --- 38.92
3.33 - 3.33
58.37 6.07 52 30
3. Mn/DOT* 38.2 ---38.2
176.79 28.16 148.63
* Acreage provided by Frankfort Township Engineer, Pete Raatikka (9/16/90).
PROPOSAL
The existing high water mark has a footprint of approximately 45-50 acres
and is capable of handling large storm/rainfall events (50-year plus).
Although the retention area is quite large, the existing drainage outlet is
sized comparatively too small. Historically the outlet was an 18-inch drain
field line. Our understanding is that during the summer of 1991 a portion
of this line was replaced and reduced to an 8-inch line. Since then, during
frequent rainfall events, the retention area accumulates new volumes before
the previous volume has completely drained.
Our intention is to provide a surplus outlet. The outlet is not designed to
handle any specified rainfall event, but to provide a more rapid relief
under high flood waters. The proposed outlet invert has been set based on
the outlet invert from the nearby DNR protected wetland (415W, 947.74MSL).
As can be determined by the attached support documentation, this proposed
outlet will provide relief from high flood waters in a matter of a few
days. Using a worse case scenario of a 50-year storm event and assuming
that the existing outlet to the northeast is absent, the proposed outlet
will remove the total volume of 43.2 acre-feet in 7.3 days. (12" RCP @ 3.0
c.f.s. )
Understandably, this outlet is not expected to drain the complete storm
event, but has the ability to lower the base elevation in the retention
area to 947.75 MSL. Assuming this was the static elevation prior to a
50-year storm event, the flood level would rise to approximately 949.0
feet. The existing water elevation is 950.50, approximately 2.5 feet below
the centerline of east -bound I-94.
COST ESTIMATES
12" RCP @ .6%, 1022 l.f. @ 17.00 = $17,374.00
12" RCP flared end w/trash guard = 500.00
65' RCP jacking under railroad w/30"
steel casing @ 120.00/ft. 7,800.00
2 standard 27" RCP manholes @ 600.00 = 1,200.00
1 standard 60" RCP catch basin @ 1500.00 = 1,500.00
1 connection to existing system @ 800.00 = 800.00
430' ditch excavation @ 5.00/ft. = 2,150.00
Seeding & mulching, 1.1 acre @ 1000.00 (restoration) = 1,100.00
Sodding, 100 S.Y. @ 2.00 = 200.00
Estimated construction $32,624.00
Engineering S contingency 6,500.00
Estimated Project Cost $39,124.00
COST SHARING
Several methods and variations have been proposed locally for cost sharing.
The generally agreed upon concept is that each governmental body involved
should participate based on percent of total rainfall runoff contributed to
the retention area. Once MnDOt has determined what portion of the project
costs it is responsible for, the remaining portion will be shared upon
mutual agreement between the City of Albertville and Frankfort Township.