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Parks Packet 06.21.23
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Parks Packet 06.21.23
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4/4/2024 1:13:09 PM
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Commissions
Meeting Date
6/21/2023
Document Type
Agenda/Packets
Commission Name
Parks
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Shayla Denaway <br />May 22, 2023 <br />Page 2 <br />K:\020552-000\Admin\Docs\3. Phase 4_Cost Estimating\Hugo North Start Cost Estimating <br />052223.docx <br />2. Option 2 <br /> <br />The western and central north-south lateral ditches would be filled. One ditch plug would <br />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 <br />OCS with a set elevation would be installed at the southwestern edge of the parcel where <br />the ditch connects to JD 3. <br /> <br />Construction Cost Estimate Methods <br /> <br />The cost for construction of the project, not including the restoration or monitoring tasks, was <br />estimated with both material and labor costs factored in. <br /> <br />Earthmoving for ditch plug construction was estimated assuming clay fill would have to be <br />brought in from offsite since onsite soils may not be suitable for plug construction. It is assumed <br />that ten ditch plugs will be necessary to create desirable hydraulic conditions. Two outlet control <br />structures were estimated to provide finer water surface level control as needed for the wetlands. <br />Construction is proposed to occur over the winter months, so erosion control blankets were <br />estimated on all ditch plug grading areas, sediment control logs at the bottom of the ditch plug <br />grading areas, and silt fence downgradient of the outlet control structures until vegetation can be <br />established with the restoration efforts in the following months. A mobilization cost was estimated <br />assuming approximately 9% of construction cost total. With the project still at a preliminary stage, <br />a 20% contingency was added to the construction subtotal in case of unforeseen construction <br />costs and an additional 10% contingency was added for future indirect costs the project may <br />require. <br /> <br />Restoration and monitoring tasks were estimated as the cost to complete the initial install during <br />construction. The restoration costs included site-wide herbicide application, burning/mowing, and <br />seeding. Restoration recommendations will be refined during design. The breakdown of costs <br />between these areas in included in Appendix C. <br /> <br /> <br />Table 1 shows the projected credit allocations for the North Star Wetland Bank from the draft <br />prospectus. Table 2 shows potential revenue from the bank based on the draft prospectus <br />concept, and under a concept of fewer acres meeting performance standards and fewer credits <br />are achieved. Note that enhancement may give a similar credit allocation (33-50%) to those listed <br />in Table 1, but acreages may vary depending on the results of a level 2 wetland delineation of the <br />internal areas of the site (Table 3). <br /> <br />Table 1. Projected credit allocations. <br />Credit Area Proposed Credit <br />Action <br />Credit <br />Allocation <br />Acres Credit Amount <br />Wetland Restoration via <br />Re-establishment <br />(3) <br />100 19.6 19.6000 <br />Wetland Restoration via <br />Rehabilitation (4B) <br />50 98.71 49.3550 <br />Upland Upland Buffer 25 5.12 1.2800 <br />Total 123.43 70.235 <br /> <br /> <br />
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