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ASTM #8 AGGREGATE <br />IN OPENINGS <br />�— CONCRETE PAVER <br />i <br />i <br />1" WASHED SAND <br />OR <br />0.5" WASHED CRUSHED <br />FOR BASE MATERIAL <br />6" OPEN -GRADED BASE <br />MATERIAL, -"-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 6.3.6 — Example of a Permeable Paver Section <br />STONE <br />Grid systems include those made of concrete or plastic. Concrete units <br />are precast in a manufacturing facility, packaged and shipped to the <br />site for installation. Plastic grids typically are delivered to the site in <br />rolls or sections. The openings in both grid types are filled with topsoil <br />and grass or permeable aggregate. Plastic grid sections connect <br />together and are pinned into a dense -graded base, or are eventually <br />held in place by the grass root structure. Both systems can be installed <br />on an open -graded aggregate base as well as a dense -graded aggregate <br />base. <br />Applications and Permeable paving surfaces are an important integrated management <br />Limitations practice within the LID approach and can be designed to accommodate <br />pedestrian, bicycle and auto traffic while allowing infiltration, treatment <br />and storage of stormwater. <br />Volume V — Runoff Treatment BMPs — December 2014 <br />5-17 <br />