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Component <br />Surface/Wearing Course <br />Permeable Pave- <br />ments, all <br />Porous asphalt or per- <br />vious concrete <br />A, S <br />Ab <br />Recommended Frequency a <br />Inspection I Routine Maintenance <br />AorB <br />Table V-A.22: Maintenance Standards - Permeable Pavement <br />Condition when Maintenance is Needed <br />(Standards) <br />Runoff from adjacent pervious areas deposits <br />soil, mulch or sediment on paving <br />None (routine maintenance) <br />Surface is clogged: Ponding on surface or water <br />flows off the permeable pavement surface dur- <br />ing a rain event (does not infiltrate) <br />Action Needed (Procedures) <br />• Clean deposited soil or other materials from permeable pavement or other adjacent surfacing <br />• Check if surface elevation of planted area is too high, or slopes towards pavement, and can be regraded (prior <br />to regrading, protect permeable pavement by covering with temporary plastic and secure covering in place) <br />• Mulch and/or plant all exposed soils that may erode to pavement surface <br />Clean surface debris from pavement surface using one or a combination of the following methods: <br />• Remove sediment, debris, trash, vegetation, and other debris deposited onto pavement (rakes and leaf <br />blowers can be used for removing leaves) <br />• Vacuum/sweep permeable paving installation using: <br />o Walk -behind vacuum (sidewalks) <br />o High efficiency regenerative airorvacuum sweeper (roadways, parking lots) <br />o ShopVac or brush brooms (small areas) <br />• Hand held pressure washer or power washer with rotating brushes Follow equipment manufacturer guidelines <br />for when equipment is most effective for cleaning permeable pavement. Dry weather is more effective for <br />some equipment. <br />• Review the overall performance of the facility (note that small clogged areas may not reduce overall per- <br />formance of facility) <br />• Test the surface infiltration rate using ASTM C 1701 as a corrective maintenance indicator. Perform one test <br />per installation, up to 2,500 square feet. Perform an additional test for each additional 2,500 square feet up to <br />15,000 square feet total. Above 15,000 square feet, add one test for every 10,000 square feet. <br />• If the results indicate an infiltration rate of 10 inches per hour or less, then perform corrective maintenance to <br />restore permeability. To clean clogged pavement surfaces, use one or combination of the following methods: <br />2019 Stormwater Management Manual for Western Washington <br />Volume V - AppendixA - Page 1025 <br />