A five-foot wide concrete drainage alley sits between the face of a proposed retaining wall and a proposed parking structure. The concrete slab features a maximum five percent cross-slope directed toward the center of the alley. The assembly rests on twenty-four inches of non-expansive, compacted fill as specified in the geotechnical report. The gutter maintains a maximum longitudinal slope of four percent, and concrete control joints occur at ten-foot intervals.
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