HomeMy WebLinkAbout1997-11-17 BRAA Fax to CA Re Barr Engineering Report 6126361311
BONESTR00 ROSENE ANDERLIK • 6126361311 11/17/97 10:12 5 :01 N0:855
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BONESTROO ROSENE ANDERLIK g 6126361311 11/17/97 10:12 5 :02 N0:855
Barr Engineering Co.
•
MEMORANDUM
To: Valley Branch Managers
From: Jon W. Lennander
Subject: Oak Park Heights Annexation
Data: November 10, 1997
At the request of the Managers I have reviewed the proposed Screaton/Kern Annexation plan for
the portion of Baytown Township to be developed as a part of Oak Park Heights. It appears there
will be some impact on the water levels in Cloverdale/McDonald Lakes and Goetschel Ponds
resulting from this annexation, but it is not expected to increase the problems of these lakes
beyond the current situation. However a large portion of the annexation area is presently drained
to Browns Creek. I suspect there may a request to change this condition in the future. This
change would be more difficult for the District to deal with.
Attached is a plan of the drainage area for the annexation area (Figure 1). The hatched area is
the annexation area, and the cross hatched area is the portion of Valley Branch which currently
drains towards Browns Creek. Approximately 75 percent of the total annexation area (180 acres)
is within Valley Branch Watershed District. The watershed contributing to Browns Creek is about
64 acres, approximately 63 acres drains towards Cloverdale Lake, and the remaining 53 acres
drains to Goetschei Ponds.
Currently the portion of the watershed diverted to Browns Creek consists of the Kern Center area
(VBWD Permit 89 -22). This is the commercial development on the west side of Highway 5
between Highway 36 and 55th Street. Most of the Kern Center is completed or under construction.
Assuming drainage from this area is not redirected to Valley Branch, there will be no change
resulting from the annexation of this portion of the watershed. The area west of Kern Center is
formally in Browns Creek and will not impact the District.
Approximately 113 of the annexation area is within the Cloverdale/McDonald Lakes watershed.
This includes the area along Highway 5 between 50th Street and 55th Street. Frorn the
Annexation Study it appears this area will be primarily single family residential land use, medium
• density residential land use, and the church property. Medium density is reported to be 6 units
per acre and the single family areas to be 2.5 units per acre. This area is currently undeveloped
and drains to Cloverdale Lake through culvert under Highway 5 near St. Johns Lutheran Church. -
There is a low area near this culvert, and it is uncertain how often this area discharges to
Cloverdale under existing conditions.
BONESTROO ROSENE ANDERLIK g 6126361311 11/17/97 10:12 5 :03 N0:855
To: Valley Branch Managers
From: Jon W. Lennander
Subject: Oak Park Heights Annexation
Date: November 10. 1997
Pruiect
Page 2
The southwesterly portion of the annexation area currently drains to Goetschel Ponds. This area
contains substantial wetland areas which are a part of the Goetschel Pond system. This area is
proposed to be single family residential land use. Under existing land use this area is proposed
and open space single family residential land use. The difference for the proposed annexation
would primarily be the density of development.
tormwater Concerns
Drainage from the Kern Center is directed to a large stormwater pond on the west side of the
property. All drainage from this site is directed towards this pond, and then outlet to Browns
Creek. A similar area appears to drain to this pond from the Browns Creek side of the site. It will
be expensive and difficult to separate these areas at this time. The site drainage for the Kern
Center was approved by the Browns Creek WMO while in existence (see attached letter). The
formation of the Browns Creek Watershed District, and the concern of trout stream issues in the
watershed, may bring the issue of drainage from this area before the Managers in the future.
An annual hydrologic yield model was used to determine the impact of increasing the volume of
runoff to Cloverdale/McDonald resulting from the annexation. Based on this model, it appears the
water level in Cloverdale will become more variable, and possibly higher on occasions, but in
general the problem in Cloverdale will not be worse than currently exists. Since this area will only
impact McDonald when Cloverdale exceeds it's outlet elevation, the impact on McDonald is much
less than for Cloverdale. Since there is no outlet from these lakes, any increase in runoff volume
directed to this area will potentially increase the risk of flooding to the adjacent homeowners, but
the actual difference in water level with, or without, the annexation is difficult to determine, and
dependant on yearly variations in hydrologic conditions.
The portion of the site draining to Goetschel Ponds will see much less of an impact from the
annexation. The watershed contributing to Goetschel Pond is 2622 acres with an occasional, and
planned future, additional drainage area of 1695 acres from the Sunnybrook area (4317 acres
total). The additional runoff from the annexation area is expected to be less than 1 percent of the
total runoff volume from the watershed, but cannot be calculated accurately by the simple methods
used for this analysis. However, there is no current outlet from Goetschel Ponds, and any
additional runoff to this area may increase the flooding risk around Goetschel Pond.
BONESTROO ROSENE ANDERLIK 6126361311 11/17/97 10:12 5:04 N0:855
To Valley Branch Manager'
From: Jon W. Lerma ler
Subject: Oak Park Heights Annexation
Det.t November 10, 1997
rt91121; Pace 3
Water Quality Concerns
The changes resulting from the annexation may also increase the impact oa the future water
quality of Cloverdale/McDonald. There is approximately a ten fold difference between low density
residential land use and medium density land use in annual phosphorus loading from a watershed.
Cloverdale and McDonald Lakes are classified as category III water bodies. Goetschel Ponds are
classified as a category V water body, and will be impacted less by the development of the •
annexation area.
If appropriate BMP's are included in the development of the annexation area, the impact of these
areas will be minimized. Construction activities related to the annexation would be expected to
have a significant impact on the water quality of these water bodies if appropriate protection is not
provided during the work. Assuming the development of this area is completed consistent with the
rules and regulations of the District, the designated water quality classification of each body
should be protected.
Reeommendations
• The District should begin negotiations with Browns Creek Watershed District to change the
hydrologic boundaries of the District on a permanent basis. The District boundary should also
be changed to reflect the actual arca draining to Browns Creek in this area.
• If possible, the area draining to Cloverdale/McDonald should be directed to Goetschel Pond.
The impact of this area on Goetschel Ponds is less than would be observed in Cloverdale, and
would not be expected to substantially change the conditions in GoetscheI Fonds. It is
assumed that an outlet from Goetschel Ponds will be completed before an outlet from
Cloverdale/ McDonald and further reduce the impact of this area.
• The development many of the upper portions of the watershed will begin to take place. The
construction of a permanent outlet system for the landlocked lakes in these areas will continue
to be critical. Further development will increase the necessity for the outlet, and reduce the
time to implement. The Managers should begin planning the construction of this outlet
system. A plan for this outlet will be developed during 1998.
BONESTROO ROSENE ANDERLIK Ty 6126361311 11117/97 10 :12 :05 N0:855
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0 Figure 1
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I I I Palley Branch Watershed District
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EXHIBIT E
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PYHIBIT H
. BONESTROO ROSENE ANDERLIK 6126361311 11/17/97 10:12 5 :08 N0:855
WASHINGTON SOIL AND WATER
CONSERVATION DISTRICT
1111P
11125 Curve Gee. i1vd.. Ream 101
D 012) 43,-6361
33007
(614)
MINNESOTA
SOIL AND WATER CONSERVATION DISTRICTS
August 22, 1989
Patricia L. St. Claire •
Clerk, Baytown Township •
14949 30th Street North
Stillwater, MN 55082
Dear Ms. St. Claire:
On August 21, 1989, Tim Fredbo, Manager for the Washington
County Soil and Water Conservation District, informed me •
about the proposed Kern Center Development. He was
contacted by Bruce Folz, planner for the project, who
informed limn that Valley Branch Watershed District was not
granting a permit until the Brown's; Creek Water Management
Organization (BCWMO) reviewed the proposed development.
First of all, the BCWMO Water Management Plan has not been
formally approved by the Minnesota Board of Water and Soil
Resources. Therefore, the BCWMO does not have permitting
authority at this time. However, after consulting with Mr.
Fredbo, who has reviewed the revised drainage plan of 8 -4 -89
for the site, the plan is in conformance with Water
Management Plan policies, so the BCWMO has no problems with
it as proposed.
Please feel free to call me at 439 -3142 if you have any
questions regarding this matter.
Sincerely,
• David Truax
Chairman, BCWMO
cc: Stillwater Twp.
Valley Branch Watershed District
Bruce Folz
Dennis O'Donnell
Nile Kriesel, Sec. BCWMO Board •
AN EQUAL OPPORTUNITY EMPLOYER