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ISv <br />e: <br />1^. <br />Zoning File #1807 <br />April 12. 1993 <br />Page 2 <br />Description of Request <br />Applicant proposes the filling of approximately 134 cubic yards of fill to stabilize major <br />portions of the lakeshore bank that is susuining serious erosion. Major portions of the lower <br />areas have washed downhill to lake. A 24" elm at the top of the bank will be lost if repairs are <br />not made. <br />In the early *80’s the neighbor to the immediate west applied for similar alterations of <br />bank based on similar erosion problems. <br />Roth the DNR and MCWD have been asked to review tht proposal to determine if <br />permits will be necessary. The DNR will not require a permit review as long as all alteration <br />are above the 929.4. As alterations are proposed between the 930 and 931.5, an MCWD permit <br />will be lequired. Applicani has been advised of the need to file a permit application. <br />The repair of the bank consists of cutting and filling and the installing of a geogrid fabric <br />in tiered layen and all will be covered over with earth. The enclosed improvement will not <br />result in any har dcover. Please review Exhibit G. Shawn Gustafson has advised that he has <br />contacted the Miragrid manufacturer. In reviewing the proposed plan for installation, the <br />manufacturer concurred with the City Engineer that the proposed use of the miragrid would not <br />be to susuin the bank and that additional anchors and support system would be <br />necessary. The engineer has recommended the following additions and changes in the current <br />proposal: <br />1. <br />2. <br />Fill soil must be of a granular material not clay <br />Fill soil should be compacted no greater than at 6" lifts to minimum specified <br />density of 95%. <br />3.Miragrid needs to be anchored to soil bank and suggest use of duckbill anclmrs <br />set into soil bank and tied to a scries of pipes or bars laid parallel to shoreline. <br />Miragrid could then be anached or wrap^ around these pipes and anchored to <br />side slope. <br />4.Seeding with Crown Vetch or other quick spreading plant with good root b^. <br />Possible use of permanent turf restoration such as miramat. Gusufson advises <br />proposed American Excelsior Biodegradable turf is temporary and will not <br />prevent, future erosion unless adequate vegetation is restored. <br />5. <br />6 <br />Rip rap to prevent undermining of restored bank <br />Silt fence installed along shoreline prior to construction <br />> .V - .1