HomeMy WebLinkAbout1979-04-19 BRAA Ltr to OPH e0 1
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2335 W. 14iw4 #iyluualj 36 Otto G. Bonestroo, P.E. Lawrence F. Feldsien, P.E
Robert R'. Rosene, P.E. Glenn R. Cook, P.E.
/� � 4 /haul, Af4use 4 55113 Joseph C. Anderlik, P.F. Keith A. Gordon, P.E.
/�df0/i6: 636 —�60� Bradlord A. Lemberg, P.E. Thomas E. Noyes, P.E.
Robert D. Frigaard, P.E. Richard W. Fnster, P.E.
Richard E. Turner, P.£ Robert G. Schunicht, P.E.
James C. Olson, P.E. Marvin L. Sorvala, P.E.
Donald C. Burgardt, P.E.
Kenneth R. Meister, P.E.
April 19, 1979 Charles A. Erickson
Leo M. Puwelsky
Harlan M. Olson
City Council
City of Oak Park Heights
14168 - 57th Street No.
Stillwater, Mn. 55082
he: St. Croix Mall
Surface Drainage Study
City of Oak Park Heights
File No. 55
Gentlemen:
We have studied the surface drainage runoff and collection facilities for
the St. Croix Mali property owned by Swager 3 as requested and submit
the following infrormation and recommendations:
1. South Side
The existing storm sewer was found to be of adequate size to handle the
surface drainage generated by a 2" per hour rainfall. The existing line
should be extended, however, as indicated on the K -Mart Plan to complete the
south area system.
2. Northwest Area
The northwest area includes part of the K -Mart area, part of the Bowling
Alley area, the VFW Club, Kentucky Fried Chicken and the adjacent parking lot
areas. This area is approximately 5.8 acres and the runoff caused by a 2"
per hour rainfall will be approximately 11.03 cubic feet per second (11.03
c.f.s.). The surface drainage from this area flows toward T.H. 212 down the
IJ.W. entrance drive. This plan will produce a depth of flowing water of
approximately lZ ". While this runoff can be adequately handled in this manner,
good design procedures would install an 18" R.C.P. pipe at 1% grade running
from the storm sewer on the service road to the point where the entrance drive
meets the parking lot and there placing two catch basins, one on each side of
the entrance road, to intercept the surface water runoff.
3. Northeast Area
The northwest area includes a part of the main building, the greater
part of the north parking lot and one -half of the bank. The area includes
approximately 4.6 acres. Here, as in the northwest area, the runoff is
strictly surface drainage until it reaches the service road on T.H. 212. A
2 per hour rainfall in this area will generate a flow of approximately 8.7 cfs.
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Y ` V •
City of Oak Park Heights April 19, 1979
Stillwater, Mn. 55082
Re: File No. 55
Again while this water can flow down the northeast entrance road good design
practice would require the installation of a 15" RCP pipe at 1.5% grade.
Two catch basins should be installed at the junction of the entrance road and
the parking lot to intercept the runoff before it enters the entrance road.
The preceding information covers the surface water runoff for the St. Croix
Mall area. It is recommended that the storm sewer lines and catch basins
discussed previously be installed to handle the north side of the area for the
benefit of the Mall customers, the owners and the City, and to prevent possible
erosion problems.
If there are any questions on this matter, please feel free to contact our
office.
Yours very truly,
BON, STROO, ROSENE, ANDERLIK & ASSOCIATES, INC.
�"`
( eim Bradf rd Aberg, P.E.
BAL:li j
cc: Swager Bros.
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