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Figure V-5.92: Typical Bioretention <br /> Provide a 1"drop Provide a 1"drop <br /> from the edge of from the edge of <br /> pavement sidewalk <br /> 0. BSM bottom width ,� <br /> Edge oImL <br /> varies,1'minimum <br /> Overflow structure Sidewalk <br /> or flow path <br /> or 1 �i, < r f`i v„, fi min freeboard <br /> r- - 1.i, (i i & , \ , P_onding depth \,/ oi;�- . I i I( i I�"� `i I'T�.' s_. <br /> n_t2"woodchlp mulch • �—Ili, .—.ij-.`i Ili_ i fff' 2'"woods hip mulch <br /> or aggregate <br /> era re to =i - �z - =Y-,.,�; 1 11` r— <br /> 3"coarse compost <br /> Minimum separation varies, in pending area <br /> p see design guidance <br /> ..... .���. �... �. .. �.�.__._ .._. 18"Bioretantion Soil Mix <br /> (BSM) <br /> Seasonal high water table.bedrock, <br /> or other impervious layer <br /> Notes: <br /> 1. Scarify subgrade 3"min.before <br /> bioretention soil installation <br /> 2. Compact BSM to 85%per ASTM <br /> 1577 NOT TO SCALE <br /> bliki� <br /> Typical Bioretention <br /> 1110111 <br /> III Revised January 2019 <br /> DEPARTMENT OF <br /> ECOLOGY Please see httpi/wx+w.ecy wa.gov/copyrIght.html for copyright notice including permissions, <br /> State of Washington limitation of liability,and disclaimer. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume V-Chapter 5-Page 776 <br />