HomeMy WebLinkAbout2002-11-01 PWD Interoffice Memo Re BCWD Permit ViolationsCity of
Oak Pa-Lk Heights
14168 Oak Park Blvd Me Box 2007 ■ Oak Park Hei NIN 55082 e (651) 439-4439 * Fax 439-0574
Interoffice Memo
To Ma and Cit Council
From: Public Works Director, Ja Johnson, PE F"L:AE COPY
CC: Cit Administrator, Cit En Communit Development Director, BCWD
En and Administrator
Date: 11/01/02
Re: Browns Creek Meetin on Oak Park Station Permit Violations
Oak Park Station: The Browns Creek Permit violations were for the lack of maintenance
of erosion controls resultin in the sediment deposits in the pond. Primaril the erosion
control failed in the ditch leadin into the northeast corner of the pond resultin in a delta of
sediment formin in the pond. The fencin around the ed of the pond and further up the
hill also had areas of failure.'
Brown Creek Board of
Mana passed several
motions. Below are m
notes on their motions.
MqA
TREE CITY U.S.A.
5. Browns creek finds that the water causing the erosion is not exclusively from the
Oak Park station property and that by written correspondence the Administrator is
to request that city of Oak Park Heights with Goldridge Group in solving the
erosion problem in the ditch. This cooperation could include a financial
contribution.
Goldridge Group presented a cost estimate for doing the rip rap of $8000. However,
they had only received the estimate a few hours earlier and were not sure if the cost
was for rip rap from .Memorial Avenue to the point that the undercutting of the ditch
was occurring or from the undercut to the pond or from the street to the pond. The
details of the estimate were not provided. They will need to provide a plan showing
exactly what they want to do and a cost estimate for our city Engineer to review.
During a walkthrough of the site on October 29, 2002 Mr. Stamm of Goldridge Group
stated that the $8000 cost was for working in the ditch from the undercut to the pond.
The suggested solution from the BCWD Board was to rip rap from the road to the
undercut. Another possible solution is to implement modifications to the ditch which
have been delayed until the future phases of the development occurs at oak Park
Station. These modifications included the repair the stilling basin at the pipe outlet;
widening the ditch from Memorial Avenue to the pond; stabilization of the ditch with
vegetative cover and another small sedimentation pond. The unusually rainy summer
and fall, along with the delay of the storm water improvements and the lack of erosion
control maintenance are contributors to the erosion of the ditch and sedimentation into
the pond.
The water flowing through this ditch comes from the northwest part of oak Park
Station, from the west sides of DDD, zanadu, and the Kennedy Building, and from
under Memorial Avenue the water comes from the Post office, all of zintl's Properties,
the mini storage, Buberl's, and the vacant lots north of Buberl's. The majority of the
area tributary to the ditch is from sites other than oak Park Station. If Goldridge Group
had maintained the silt fence in accordance with their permit and had stabilized the
disturbed areas in a timely fashion the erosion into the pond would have been
minimized.
Mr. Bill Rambo as the representative of the owner of oak Park station told nee on
October 25, 2002 that he had instructed the Goldridge Group to have the silt fence
fixed this weekend and the ditch work completed by November 7, 2002.
2
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1. The existing silt fence is to be repaired or removed and replaced as appropriate
throughout the entire project by November 8, 2002 with fencing that meets the
specification written by their engineer and approved as part of the construction plan
approval. Much of this work was finished by October 28, 2002 with only a few areas
still requiring protection.
2. All construction within the ditch must meet the grades, storm water flows patterns, and
configuration shown on the currently approved plan. Any changes must have prior
approval of the appropriate approving authority depending on the extent of the change.
Some or all of the following may have approval authority community development
Department, City Administrator, City Engineer, City council, and Brown creek
Watershed District.
3. Fill the gullies under the erosion blanket and re -seed all exposed and un-- stabilized
areas on the area on the north and west hillsides of the pond and near to Memorial
Avenue with dormant seed for spring germination. This work should be performed in
conjunction with the removal of silt form the wetlands.
4. Erosion control inspections shall be performed and documented with a written record
at least weekly until frost is well established in the ground and after every rain storm.
n the spring an inspection shall be made and documented prior to the spring melt and
no later than March 1, 2003. weekly inspection and inspections after each rain storm
will be made and documented after March 1, 2003 and until final slope stabilization has
occurred with vegetative cover.
If you have any question, please contact me.
4
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