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( <br /> May 5, 2008 <br /> Mr. Ron Riach/JRR Engineering, lnc. <br /> L&A Job No. 8A043 <br /> Page 6 <br /> of 7/8-inch-minus crushed rock should be pl;iced against the back of the block wall. This vertical <br /> drainage blanket should be hydraulically connected to the drain line at the base of the wall. Soil <br /> structural £11 may be placed behind the vertical drainage blanket. The vcriical drainage blanket <br /> and structural fill should be constructed in :ifts aRer each course of blocks is completed. <br /> Storm runoff over thc paved roadway should not be allowed to ilow towards the block wall. The <br /> pavement of the roadway should be graded to slope away from the block wall or a curb should be <br /> built along the block-wall sidc edge of th�pavement to keep ruuotl'from reachin�the block wall. <br /> Storm runoi°should bc captured with catch basins installed in the roadway and drained away <br /> with an underground drain line system. <br /> Structural Fill <br /> Structural fill is the fill that support structural or traffic load. Structural fill shoula consist of <br /> clean granulur soils free of organics, debris and other deleterious substances, with particles not <br /> larger than four inches. Structural fill shouid have a moisture content within onc percent of its <br /> o,�timum moisture content at the time of placement. The optimum moisture wntent is the water <br /> content in thc soil U�at enable thc soil to be compacted to thc highest dry density for a given <br /> compaction cff'ort. Onsite clean soils meeting to above requirements may be used as structural <br /> fill. Crushcd rock fill and soil structural fill should be placed in IiRs no more than 10 inches <br /> thick in loose state, with cach lift compacted to at least 95% of the maximum dry density <br /> detcrniined by ASTM U 1557 (Modificd Proctor method). <br /> Gcogrid Mesh <br /> Fach layer of geogrid mesh should ix� laid on levei bar,kfill surface, with one end securcly <br /> anchored between hvo rows of blocks, stretched tight, and the other cnd staked down prior to thc <br /> pl�cement oP thc next lifl of b�ckfill. Overlaps of geogrid mesh in the lirection of the w,.11 <br /> LIU & ASSOt:'IATES, IN�. <br /> ��i� <br />