My WebLink
|
Help
|
About
|
Sign Out
Home
Parks Packet 04.19.23
Hugo
>
Community Development
>
Parks
>
Parks Commission
>
Parks Commission Agenda/Packets
>
2023
>
Parks Packet 04.19.23
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
4/4/2024 1:12:59 PM
Creation date
4/4/2024 12:57:29 PM
Metadata
Fields
Template:
Commissions
Meeting Date
4/19/2023
Document Type
Agenda/Packets
Commission Name
Parks
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
78
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Draft Prospectus Document Page 4 07/07/2020 <br />Wetland boundaries are shown on Figure 2, Appendix A. Much of the site is existing, partially drained wetland. <br />There are small areas of upland at the far north and south ends of the site. <br /> <br />Project Plans <br />Thoroughly describe actions you will undertake to restore, enhance, or create wetland on your site. Support this <br />narrative with a simple drawing or sketch showing where these actions will occur (Figure 3). <br />For projects that preserve and protect existing high-quality wetlands, review the BWSR/Corps joint “Guidance on <br />Evaluating Potential Wetland Preservation Sites …” and briefly describe how your proposal could satisfy eligibility <br />requirements in the guidance. This document is available on BWSR and Corps websites. <br />Figures 3a and 3b, Appendix A display two options for hydraulic wetland restoration. The goal of this project is to <br />restore the historic hydrology of the currently drained historic wetland community, manage invasive vegetation <br />monocultures, and establish native vegetation in perpetuity. <br />Figure 3a, Appendix A shows Option 1, where the wetland hydrology would be restored by constructing 2-3 ditch <br />plugs in the western and central north-south lateral ditches. Ditch plugs consist of clay core trenches compacted <br />with construction-grade clay topped with topsoil and vegetation. Ditch plugs are keyed into the banks to prevent <br />water from moving around them at high flows. One ditch plug would be constructed at the intersection of the <br />eastern lateral ditch and the east-west main ditch channel. 2-3 plugs would also be constructed in the southern <br />ditch. An outlet control structure (OCS) with a set elevation would be installed at the southwestern edge of the <br />parcel where the ditch connects to JD 3. <br />Figure 3b, Appendix A shows Option 2. The western and central north-south lateral ditches would be filled. One <br />ditch plug would be constructed at the intersection of the eastern lateral ditch and the east-west main ditch <br />channel. One ditch plug would be constructed at the western extent of the south ditch. An OCS with a set <br />elevation would be installed at the southwestern edge of the parcel where the ditch connects to JD 3. <br />A number of steps must be completed prior to selecting once of these options. Topographic survey, hydraulic <br />assessment, easement encumbrance review, subsurface drainage assessment, and soil investigation. <br />As part of the hydraulic assessment a topographic survey will be completed in addition to subsurface tile review <br />and a soil investigation to determine if sandy subsoils are present below the organic soils on site. Hydrology <br />modelling will be utilized (in the prospectus phase) to determine existing conditions that include the scope and <br />effect from JD 3 on the wetland, as well as proposed conditions to determine where the ditch plugs can be <br />placed without causing adverse effects to upstream or downstream properties. Modeling data will be used to <br />design the ditch plug placement and the runout elevation at the OCS. <br />The project will restore historic hydrology to the site creating saturated conditions that are undesirable for <br />invasive species such as reed canary grass. Vegetation management will include a site-wide herbicide application <br />on invasives in the spring. Selected tree removal will also occur at this time in the wooded areas of the site to <br />eliminate invasive and nuisance trees. Another site-wide herbicide application would be completed during the <br />late summer followed by either a controlled burn or mowing in the fall. The site would be seeded with native <br />vegetation in the fall and supplemental plantings of trees and shrubs would be installed in the wooded areas. Site <br />construction would occur in late fall or winter following initial vegetation management to increase the amount of <br />water on the site and to create less desirable growing conditions for reed canary grass to reestablish. Post <br />construction, the city would continue vegetation management (herbicide applications, burn/mow, supplemental <br />seeding, etc.) in perpetuity to maintain the quality of the wetland bank. Bank performance standards and a <br />vegetation management plan will be developed during future phases of this project. The native vegetative
The URL can be used to link to this page
Your browser does not support the video tag.