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FILTER FABRIC: FILTER FABRIC SHALL BE 4 OZ. NON -WOVEN GEOTEXTILE. PROVIDE 12 INCH LAP @ VERTICAL JOINTS AND 2 INCHES TURNING @ EACH LAYER OF GEOGRID. EXTEND FILTER FABRIC 18" BEYOND JOINT WITH EXISTING STRUCTURES AND WRAP IT WITH EXISTING STRUCTURE. BACKFILL MATERIAL: BACKFILL MATERIAL SHALL BE CLEAN FREE DRAINING SAND (SUCH AS GP, GW, SW, SP, SM BASED ON UNIFIED SOIL CLASSIFICATION SYSTEM) WITH 10% OR LESS FINES. SAND FRICTION ANGLE FOR THIS MATERIAL SHALL BE 30 DEGREES MINIMUM. ANCHOR WALL UNIT INSTALLATION: INSURE THAT UNITS ARE IN FULL CONTACT WITH BASE. PLACE SHIMS AS REQUIRED MAINTAINING DESIGN BATTER. FILL ALL VOIDS AT UNITS WITH DRAINAGE FILL MATERIAL. TEMP DRAINAGE FILL. SWEEP ALL EXCESS MATERIAL FROM TOP OF UNITS AND INSTALL NEXT COURSE. INSURE THAT EACH COURSE IS COMPLETELY FILLED WITH CRUSHED STONE. PULL THE UNITS FORWARD UNTIL THE LOCATING SURFACE OF THE UNIT CONTACTS THE LOCATING SURFACE OF THE UNITS IN THE PRECEDING COURSE. PULL THE UNIT FORWARD AS FAR AS POSSIBLE. GEOGRID INSTALLATION: THE GEOGRID SOIL REINFORCEMENT SHALL BE LAID HORIZONTALLY ON TOP OF THE ANCHOR WALL UNIT AND HORIZONTALLY ON COMPACTED BACK FILL. PULL GEOGRID TAUT AND ANCHOR WITH SOD CLIPS (OR EQUAL). THEN PLACE BACKFILL ON TOP OF THE GEOGRID. CORRECT ORIENTATION (ROLL DIRECTION) OF THE GEOGRID SHALL BE VERIFIED BY THE CONTRACTOR. FILL PLACEMENT: BACKFILL MATERIAL SHALL BE PLACED IN 12 INCH LIFTS AND COMPACTED TO 95% OF THE MODIFIED PROCTOR MAXIMUM DRY DENSITY (ASTM D - 1557). VIBRATORY PLATE COMPACTOR SUCH AS "BPU 3345 A" BY WACKER CORPORATION CAN BE USED. TESTING METHODS AND FREQUENCY, VERIFICATIONS OF MATERIAL SPECIFICATIONS AND COMPACTION SHALL BE THE RESPONSIBILITY OF THE OWNER. AS A MINIMUM, EACH AND EVERY 12" LIFT MUST BE TESTED. TEST LOCATION SHOULD NOT EXCEED 100 L.F. (ALONG THE LENGTH), OF THE WALL. FILTER FABRIC SHALL BE PLACED BETWEEN CRUSHED STONE AND SAND.