6009 FLEMING ST 2021-06-09 - Laserfiche WebLink

• Popach Short Plat—2 Lots Table V-4.5.2(2) Maintenance Standards - Infiltration (continued) • Results Expec. Maintenance Conditions When Maintenance Is ted When Component Defect Needed Maintenance Is Performed time allowed for infiltration. Treat- ment basins should infiltrate Water• Quality Design Storm Volume within and/or facility is 48 hours, and empty within 24 hours cleaned so that after cessation of most rain events. infiltration sys- (A percolation test pit or test of facility tem works • indicates facility is only working at according to 90% of its designed capabilities. Test design. every 2 to 5 years. If two inches or more sediment is present, remove). Filter bag is • Filter Bags (if Filled with Sed- Sediment and debris fill bag more replaced or sys- applicable) iment and Debris than 1/2 full. tern is redesigned. Sediment and By visual inspection, little or no water Gravel in rock Rock Filters Debris flows through filter during heavy rain filter is Side Slopes storms. replaced. • See "Detention of Pond Erosion See "Detention Ponds" (No. 1). Ponds" (No. 1). Emergency See "Detention Overflow Tree Growth See "Detention Ponds" (No. 1). Ponds" (No. 1). Spillway and • Berms over 4 ) See "Detention PipingSee "Detention Ponds" (No. 1). Ponds" (No. 'f . feet in height. ) Emergency Rock Missing See "Detention Ponds" (No. 1). See "Detention Overflow Ponds" (No. 1). • Spillway Erosion See "Detention Ponds" (No. 1). See"Detention Ponds" (No. 1). Pre-settling Facility or sump 6" or designed sediment trap depth Sediment is Ponds and filled with Sediment of sediment. removed. Vaults and/or debris • 2014 Stormwater Management Manual for Western Washington Volume V- Chapter 4-Page 834 WESTERN ENGINEERS,INC. 21 PROJECT:15-1463-A 1