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r> <br />GENERAL NOTES: <br />BOULDER RETAINING WALLS DESIGNED AS <br />GRAVITY WALLS. <br />MINIMUM BATTER (SLOPE SHOWN AT TOP <br />OF WALL ) AND SETBACK OF BOULDERS <br />IS REQUIRED FOR STABILITY. <br />MINIMUM OVERTURNING FACTOR OF SAFETY 2:1 <br />MINIMUM SLIDING FACTOR OF SAFETY 2:1 <br />BACKFILL BEHIND WALLS SHALL BE SAND OR <br />FREE-DRAINING GRANULAR MATERIAL . <br />LINE EXCAVATION WALLS WITH GEO-TEXTILE <br />FABRIC TO PREVENT SILT MIGRATION <br />INTO BACKFILL.. <br />INSTALL SLOPED PERFORATED DRAIN TILE <br />CONTINUOUS BEHIND WALL AND INSTALL 4 " DIA. <br />PVC PIPES FOR WEEP HOLES NEAR BASE <br />BETWEEN BOULDERS SPACING OF 40 FT <br />ON CENTER MAXIMUM. <br />WATER DOWN BACKFILL BEHIND BOULDERS TO <br />IMPROVE COMPACTION IF NECESSARY. <br />NO MECHANICAL COMPACTION REQUIRED. <br />FOR DESIGN PURPOSES, BOULDERS ASSUMED <br />TO BE NOMINAL 3 FT. IN DIAMETER.J