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