5.c) Goose Lake Storm Water Retrofit Project ! �
Meeting Date: 10/6/09
Agenda Item: � C �
,
City Council Agenda Report
City of Scandia
14727 209'h St. North
Scandia, MN 55073 (651) 433-2274
Action Requested: Approve water quality-related improvements to the city's Goose Lake
Landing proposed by the Washington Conservation District (WCD.)
Deadline/ Timeline: Approval is requested so construction can occur yet this year.
Background: • The WCD has secured funding from for stormwater management
retrofit projects to treat runoff generated from boat launches and the
adjacent impervious areas. Runoff increases nutrient and sediment
inputs to lakes and causes erosion issues.
• Goose Lake in Scandia and Lily Lake in Stillwater were the selected
sites. These projects will serve as models for boat launch stormwater
retrofits elsewhere in the county.
• The proposed plan is attached. The engineer met with staff(Public
Works Maintenance Supervisor John Morrison and Administrator
Hurlburt) at the site to discuss the plan. The planned improvements
should not have a negative impact on the function of the boat launch,
nor will they interfere with the dry hydrant on the south side of the
site.
• There would be no cost to the city for the project. The city will
continue to be responsible for maintenance. Staff has no particular
concerns, except that the plantings in the retention/rain garden area
should be low maintenance materials (such as shrubs) rather than
plants that would require more maintenance, such as periodic
weeding.
• A representative of either the WCD or the Carnelian-Marine-St.
Croix Watershed District will be present at the Council meeting to
answer questions about the project.
Recommendation: I recommend that the Council review the plan, and consider approving it
with any conditions you deem appropriate. Staff recommends that
approval be contingent upon installation of low-maintenance plant
materials.
Attachments/ • Location Map
Materials provided: . Project Plan
Contact(s): Amy Carolan, WCD 651 275-1136 Ext. 22
Prepared by: Anne Hurlburt, Administrator
(goose lake boat launch improvements)
Page 1 of 1
10/O 1/09
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<. ,� ; Stake OHW elevation in
� � � �''�r "� � field nor to construction
� E.� ,"�. Replace existing gravel with P
P , � . ;, compacted Dressers Trap stone.
� � - Remove top 6 inches of gravel
� ` {;��� _ °•, and dispose of with City of Scandia
�� - Backfill with Dressers Trap stone,
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' < <«<i �'����� . +'� � , - Minimum storage volume below
?��'�`�`c�� � ' ��; �+ 3 ;, rip-rapped overflow equals 350 cubic feet
� �` , . ,�;� �� - Place topsoil, plant to GRG specifications
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Fill in washes on either
` � side of landing with compacted
Impervious A'a Dressers Trap stone
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. ` +�` across landing (dimensions)
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� � 3� � Redirect channel discharge away
Install 2 low ditch blocks F�`�z_ from boat landing to grassed area
�' ' in existing drainage channel. directly east; regrade lower end of
��, swale and depression as necessary
'� and revegetate/restore as per
Note: GRG specification
Tax Parcels,Contours and Aerial Photographs �,
from Washington Conservation District N "�� !'r�'
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Mxd:L:�2343\Dltrnxd\Uoose Lake Site Imprwement Map 9-28-09 mxd � . �� 4
Last ModHied:9/28/2009 3:42:36 PM � � ��
WASHINGTON CONSERVATION DISTRICT o � Wenc < SEP 2009
Wenck Associates,Inc 1800 Pioneer Creek Center 9_28_�g
Goose Lake Landing Site Improvement Map - DRAFT Environmental Engineers Maple Plain,MN 55359-0429