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PERMEABLE <br />PAVEMENT MIX <br />1" WASHED SAND OR <br />0.5" WASHED CRUSHED STONE <br />FOR BASE MATERIAL <br />6" OPEN —GRADED BASE <br />MATERIAL, 3/"-2" <br />CRUSHED —WASHED <br />SUBGRADE, DETERMINE <br />COMPACTION BASED ON <br />DESIGN REQUIREMENTS <br />Modified from <br />City of Portland <br />Detail SW-110 <br />Figure 5.3.4 — Example of a Permeable Pavement (concrete or asphalt) Section <br />Permeable interlocking concrete pavements (PICP) and aggregate <br />pavers. (see Fi(.lire 5.3.5) PICPs are solid, precast, manufactured <br />modular units. The solid pavers are (impervious) high -strength <br />Portland cement concrete manufactured with specialized production <br />equipment. Pavements constructed with these units create joints that <br />are filled with permeable aggregates and installed on an open -graded <br />aggregate bedding course. Aggregate pavers (sometime called <br />pervious pavers) are a different class of pavers from PICP. These <br />include modular precast paving units made with similar sized <br />aggregates bound together with Portland cement concrete with high - <br />strength epoxy or other adhesives. Like PICP, the joints or openings in <br />the units are filled with open -graded aggregate and placed on an open - <br />graded aggregate bedding course. Aggregate pavers are intended for <br />pedestrian use only. <br />Volume V — Runoff Treatment BMPs — December 2014 <br />5-16 <br />