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2 <br /> as a relief to the structure during periods of high water. 'Regional flood" is defined as a <br /> flood determined to be representative of large floods known to have generally occurred in <br /> Wisconsin and which may be expected to occur on a particular stream because of like <br /> physical characteristics. <br /> 6. The Town of West Marshland shall be responsible for maintenance of the structure, <br /> including keeping it free from obstructions. <br /> 7. Placement of fill and excavated materials shall be confined to the road right-of-way. No <br /> other fill shall be placed in wetlands or in the hydraulic floodway of the stream. Demolition <br /> materials shall be properly disposed of on an upland site. <br /> 8. The box culvert invert shall be set approximately ten inches below stream bed elevation to <br /> allow seasonal movements of fish at all times. <br /> 9. The flow of the stream must be maintained during the structure replacement activities (i.e. <br /> damming the water and pumping it around the site, using a temporary diversion channel, <br /> etc.). Cofferdams must be constructed out of non-erodable materials. <br /> 10. The plans should reflect that any dewatering required during construction shall be properly <br /> treated before it is allowed to enter any wetlands or surface waters. The contractor is <br /> responsible for using dewatering management practices that comply with the DNR technical <br /> standard 1061, which can be viewed at http://dnr.wi.gov/runoff/stormwater/techstds.htm <br /> 11. This concurrence letter does not provide approval for the stormwater permit application. <br /> Approval for that portion of the project will be provided under separate cover. <br /> This approval does not relieve you of any responsibilities under municipal ordinances or the <br /> current DOT Standard Specifications for Road and Bridge Construction. Further, this approval <br /> should not be interpreted to convey any assessment of the structural adequacy of the structure <br /> to support loads imposed on it. If you are unsure or have questions regarding engineering or <br /> erosion control methods, please feel free to contact Bill Zimmer, DOT Northwest Region, at <br /> 715-635-5014. If you have any questions regarding this letter, please do not hesitate to contact <br /> me at 715-635-4229. Thank you for providing us an opportunity to review this project. <br /> Sincerely, <br /> Amy Cronk <br /> Environmental Review Coordinator <br /> cc: Ruth King, Spooner <br /> Pete Engman, Crex Meadows <br /> Sean Bohan, AEC <br /> Bill Sande, ACOE — Hayward <br /> Jim Flanigan, Burnett County Zoning Department <br /> Bob Morehouse, Burnett County Highway Department <br />