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A. Drainage aggregate shall be installed to the line, grades and sections shown on the final <br /> P.E.-sealed retaining wall plans. Drainage aggregate shall be placed to the minimum <br /> thickness shown on the construction plans between and behind units(a minimum of 1 <br /> cubic foot for each exposed square foot of wall face unless otherwise noted on the final <br /> wall plans). <br /> B. Drainage collection pipes shall be installed to maintain gravity flow of water outside the <br /> reinforced-soil zone. The drainage collection pipe shall be installed at the locations shown <br /> on the final construction drawings. The drainage collection pipe shall daylight into a <br /> storm sewer or along a slope,at an elevation below the lowest point of the pipe within the <br /> aggregate drain. Drainage laterals shall be spaced at a maximum 50-foot spacing along the <br /> wall face. <br /> 4.08 Backfill Placement <br /> A. The reinforced backfill shall be placed as shown in the final wall plans in the maximum <br /> compacted lift thickness of 8 inches and shall be compacted to a minimum of 95%of <br /> standard Proctor density(ASTM D 698)at a moisture content within 4%to+3%points <br /> of optimum. The backfill shall be placed and spread in such a manner as to eliminate <br /> wrinkles or movement of the geosynthetic reinforcement and the SRW units. <br /> B. Only hand-operated compaction equipment shall be allowed within 3 feet of the back of <br /> the wall units. Compaction within the 3 feet behind the wall units shall be achieved by at <br /> least three passes of a lightweight mechanical tamper,plate, or roller. <br /> C. At the end of each day's operation,the Contractor shall slope the last level of backfill <br /> away from the wall facing and reinforced backfill to direct water runoff away from the <br /> wall face. <br /> D. At completion of wall construction,backfill shall be placed level with final top of wall <br /> elevation. If final grading,paving, landscaping and/or storm drainage installation adjacent <br /> to the wall is not placed immediately after wall completion,temporary grading and <br /> drainage shall be provided to ensure water runoff is not directed at the wall nor allowed to <br /> collect or pond behind the wall until final construction adjacent to the wall is completed. <br /> 4.09 SRW Caps <br /> A. SRW caps shall be properly aligned and glued to underlying units with VERSA-LOK <br /> adhesive, a flexible,high-strength concrete adhesive. Rigid adhesive or mortar are not <br /> acceptable. <br /> B. Caps shall overhang the top course of units by 3/4 inch to 1 inch. Slight variation in <br /> overhang is allowed to correct alignment at the top of the wall. <br /> 4.10 Construction Adjacent to Completed Wall <br /> 9 <br />