An accessible parking stall profile features a twelve-inch border with quarter-inch by quarter-inch grooves at three-quarters of an inch on center typical, bearing on natural grade and a concrete curb beyond. A four-inch minimum thick concrete ramp features an eight-inch by eight-inch thickened edge with a medium broom finish, supported by aggregate base and subbase layers. Slope is specified to be one to twenty maximum, with a one-half-inch bevel at the transition. Additional notes direct the builder to civil drawings for actual construction details and specify that requirements shown are minimums.
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