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o mg NMUM <br /> CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Stormfilter TM Cast-In-Place, Precast, Linear Stormfilter Units and Catch Basin Units. <br /> Also check DOE website and manufacturer guidelines for updates to O&M requirements. <br /> Date <br /> Drainage <br /> System Maintenance.Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> M Media filter Sediment Sediment accumulation exceeds 0.25 inches on No sediment deposits on top of cartridges. <br /> vault accumulation on top top of cartridges. Sediment on cartridges likely indicates that <br /> of filter cartridges cartridges are plugged and require <br /> maintenance. <br /> M Media filter Sediment Sediment accumulation in vault exceeds.0.5 Sediment in vault should be removed. <br /> vault accumulation in inches. Look for other indicators of clogged Cartridges should be checked and replaced. <br /> vault cartridges or overflow. or serviced as needed. <br /> M Media filter Trash and floatable Trash and floatable debris accumulation in. No trash or other floatable debris in filter <br /> vault debris accumulation vault vault. <br /> S Media filter Filter cartridges Filter vault does not drain within 24 hours Filter media checked and.replaced if needed. <br /> vault submerged following storm. Look for evidence of If cartridges are plugged with oil additional <br /> submergence due to backwater or excessive treatment or source control BMP may be <br /> hydrocarbonloading. needed. <br /> M Forebay Sediment Sediment accumulation exceeds 6 inches or Sediment accumulation less than 6 inches. <br /> accumulation one-third of the available sump. <br /> M Forebay Trash and floatable Trash and/or floatable debris accumulation. Trash and/or floatable debris should be <br /> debris accumulation removed during monthly inspections. <br /> Significant oil accumulation may indicate the <br /> need for additional treatment or source <br /> control. <br /> A Drain Sediment in Drain When drain pipes,clean-outs,become full with Sediment and debris removed. <br /> Pipes/ Pipes/Clean-Outs sediment and/or debris. <br /> ICleanoutsI <br /> A Below Access cover One maintenance person cannot remove lid Cover repaired to proper working <br /> ground Damaged/Not after applying.80 pounds of lift,corrosion of specifications or replaced. <br /> vault working deformation of cover. <br /> A Below Damaged Pipes Any part of the pipes are crushed or damaged Pipe repaired or replaced. <br /> ground due to corrosion and/or settlement. <br /> vault <br /> I Appendices <br /> Everett Mall Plaza Parcel Ill Retail Expansion Stormwater Site Plan Page 82 <br />