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Stabilizing Your Shoreline to Prevent Erosion Page 4 of 6 <br /> Geotextile fabric is usually placed beneath the rock rip-rap to prevent soil loss through the rip-rap openings. <br /> It is easy to place and provides an excellent filter barrier (Figure 4). In order to prevent punctures, plenty of <br /> slack should be provided over protruding objects that cannot be removed. A layer of sand or fine gravel can <br /> be placed on the fabric for extra protection against puncture. Enough fabric should be laid out so that the rip <br /> -rap pP rY eri he can be "wrapped" by bringing the fabric up and back down into the rip-rap. This will help hold <br /> the rip-rap together as one structural unit. Keep in mind that sunlight will degrade exposed fabric. As an <br /> alternative to the fabric, a graded filter layer can be used beneath rip-rap to prevent soil loss through the rip- <br /> rap openings. <br /> Sufficient rock must be placed at the base of the rip-rap for toe protection. Excavated toe material must be <br /> removed from the lakebed and placed in a non-wetland area. <br /> Costs <br /> The price of rip-rap placement depends on local contractors, distance to the nearest rock source, and <br /> access to the project site. It also depends on how much other work, such as clearing or earthwork, is <br /> required. <br /> If you are planning to start a project in the mid-to late-1990s, you should expect to pay $40-75 per shoreline <br /> foot for inland lake shorelines and $100-175, or more, per foot for Lake Superior shoreline protection. <br /> Inquire at the county SWCD office about cost-share assistance. <br /> A project cost can also be estimated by calling earthwork contractors in your area. A big savings can be <br /> realized if you can install these items yourself. <br /> If you want to stabilize a slumping bluff, find out about soil types and ground water level. The record from <br /> when your well was drilled may be a good information source and can be obtained from the state or county <br /> health department or from your well driller. Contact your county SWCD for information on soils. <br /> Effective bluff stabilization will require technical assistance. Request an engineer from the BWSR, SWCD, <br /> or NRCS to inspect your site, or consider hiring a geotechnical engineering firm to take soil borings, analyze <br /> soil properties, and recommend a remedy. Most private consulting firms can drill 100 feet a day and charge <br /> $1,000 a day. For a small site, drilling, analysis, and a recommendation will cost about $2,000 (1996). <br /> Regulations that Apply <br /> All erosion protection projects that alter the lake- or riverbed require a protected waters permit from the <br /> Department of Natural Resources (DNR). Contact the DNR Area Hydrologist for permit guidelines, which <br /> other agencies might require a permit, and for assistance in planning your erosion prevention project. Some <br /> rip-rap projects may not need a permit. For those projects requiring a permit, the fee is $75 (1996). Permit <br /> fees for projects other than rip-rap are a minimum of$75 (1996). <br /> For More Information... <br /> call <br /> county offices: <br /> University of Minnesota Extension Service <br /> Soil and Water Conservation District (SWCD) <br /> Planning and Zoning Department <br /> regional offices of MN State agencies: <br /> MN Board of Water and Soil Resources (BWSR) <br /> MN Department of Natural Resources (DNR)(Area Hydrologist) <br /> http://www.extension.umn.edu/distribution/naturalresources/components/DD6946g.html 4/4/2012 <br />