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1 <br />3A <br />4 <br />2 <br />4 <br />4"-6" <br />3"-5" <br />12"6"6" <br />3B <br />6/26/18 <br />CITY OF SOUTH BENDItemRevision <br />STANDARD <br />EFFECTIVE DATE: <br />REF STD SPEC SEC <br />APPROVED/REVISED BY THE BOARD OF PUBLIC WORKS <br />STANDARDS FOR DESIGN <br />AND CONSTRUCTION <br />Kara M. Boyles, Ph.D., P.E. Date <br />EROSION CONTROL BLANKET 7-7 <br />7-1, 7-2 <br />June 26, 2018 <br />SECTION 7 - EARTHWORK & EROSION AND SEDIMENT CONTROL <br />SLOPE INSTALLATION: <br />1. Prepare soil before installing blankets, including any necessary application of lime, <br />fertilizer, and seed. <br />2. Begin at the top of the slope by anchoring the blanket in a 6" deep x 6" wide trench <br />with approximately 12" of blanket extended beyond the up-slope portion of the trench. <br />Anchor the blanket with a row of staples/stakes approximately 12" apart in the bottom <br />of the trench. Backfill and compact the trench after stapling. Apply seed to compacted <br />soil and fold remaining 12" portion of blanket back over seed and compacted soil. <br />Secure blanket over compacted soil with a row of staples/stakes spaced approximately <br />12" apart across the width of the blanket. <br />3. Roll the blankets (A) down or (B) horizontally across the slope. Blankets will unroll with <br />appropriate side against the soil surface. All blankets must be securely fastened to soil <br />surface by placing staples/stakes in appropriate locations as per by manufacturer's <br />recommendation. <br />4. The edges of parallel blankets must be stapled with approximately 3"-5" overlap. To <br />ensure proper seam alignment, place the edge of the overlapping blanket (blanket <br />being installed on top) even with the colored seam stitch on the previously installed <br />blanket. <br />5. Splicing consecutive blankets down the slope shall be done in a shingle style with the <br />up-slope blanket overlapping the down-slope blanket 3" minimum. Staple through <br />overlapped area, approximately 12" apart across entire blanket width. <br />6. In loose soil conditions the use of staple or stake lengths greater than 6" may be <br />necessary to properly secure the blankets. <br />GENERAL NOTES: <br />1. Install erosion control blanket to prevent erosion on slopes 3:1 or steeper, as well as <br />other areas prone to erosion, to aid in establishing vegetation and preventing soil <br />movement. <br />2. Installation instructions above are provided for reference only. Installation should be <br />completed in accordance with erosion control blanket manufacturer's specifications. <br />3. Model and manufacturer to be selected based on project slopes, vegetation, and soil <br />conditions.