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• <br /> Popach Short Plat—2 Lots <br /> Table V-4.5.2(22) Maintenance Standards - Permeable Pavement <br />• (continued) <br /> Recommended Fre- Condition <br /> quency a when Main- <br /> Component tenance is Action Needed (Procedures) <br /> Inspection Routine Needed <br /> Maintenance (Standards) <br />• <br /> aged <br /> pipe A PogSied Remove roots or debris <br /> Clean orifice Plant roots, • Jet clean or rotary cut <br />• at least bian- sediment or debris/roots from under- <br /> debris(may redu- <br /> nually drain(s) <br /> Underdrain Clean pipe need more cing capacity <br /> p p If underdrains are equipped <br /> pipe as needed frequent of underdrain with a flow restrictor(e.g., <br /> cleaning dur- (may cause orifice)to attenuate flows, <br />• ing wet sea- prolonged the orifice must be cleaned <br /> son) drawdown regularly <br /> period) <br /> Clean orifice • Jet clean or rotary cut <br /> at least bian- debris/roots from under- <br /> nually (may Plant roots, drain(s) <br />• Raised sub-ace over- pipe need more Cleansediment or <br /> If underdrains are equipped <br /> surfsurf debris redu- <br /> w pipe as needed frequent cing capacity with a flow restrictor(e.g., <br /> flcleaning dur- of underdrain orifice)to attenuate flows, <br /> ing wet sea- the orifice must be cleaned <br /> son) regularly <br />• Sediment, <br /> vegetation, or • Clear the blockage <br /> Outlet struc- debris redu- • Identify the source of the <br /> ture A' S cing capacity blockage and take actions <br /> of outlet struc- to prevent future blockages <br /> ture <br /> Native soil is <br /> exposed or • <br /> other signs of Repair erosion and stabilize sur- <br /> Overflow B erosion dam- face <br /> age are <br /> present at dis- <br /> charge point <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 900 <br /> WESTERN ENGINEERS,INC. 17 PROJECT:15-1463-A <br />