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Operations/Maintenance BMPs Detention Ponds Rev _ 12/30/2010 page 1 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions General Trash & Debris Trash & Debris present? 5 ft3 /1,000 ft2 5 ft3 /1,000 ft2 Clear Trash and Debris Perform maintenance now Perform at next scheduled maintenance Poisonous Vegetation and noxious weeds Poisonous or nuisance vegetation present? YES NO Noxious weeds present? YES NO Eradicate or begin control effort Initiate IPM policies Contaminants and Pollution Evidence of oil, gasoline or other pollutants? YES NO Remove Perform removal/cleanup Rodent Holes Does the facility act as a dam or berm? YES NO Evidence of rodent holes? YES NO Evidence of water piping through dam or berm via rodent holes? YES NO Eliminate rodents and repair dam or berm (coordinate with Ecology Dam Safety Office if pond exceeds 10 acre-feet). Initiate IPM policies Engineers review and recommended actions ---PAGE BREAK--- Operations/Maintenance BMPs Detention Ponds Rev _ 12/30/2010 page 2 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions General (cont.) Beaver Dams Dam results in change or function of the facility? YES NO Return facility to design function. Coordinate trapping of beavers and dam removal with permitting authorities. Insects Insects such as wasps and hornets interfere with maintenance? YES NO Mosquito’s present? YES NO Vector control Initiate IPM policies Coordinate mosquito surveillance Tree Growth and Hazard Trees Trees interfere with maintenance access or activities? YES NO Dead, diseased, or dying trees identified? YES NO Remove hazardous or nuisance trees. Contact certified Arborist to assess health of target trees Remove as needed Side Slopes of Pond Erosion Erosion 2 inches deep? YES NO Cause or potential still present? YES NO Stabilize Slopes Use appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. ---PAGE BREAK--- Operations/Maintenance BMPs Detention Ponds Rev _ 12/30/2010 page 3 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Side Slopes of Pond (cont.) Erosion (cont.) Erosion observed on a compacted berm embankment? YES NO If erosion is on a compacted berm, an engineer’s review and recommended actions are required. Storage Area Sediment Sediment > 10% of designed pond depth? YES NO Sediment affecting the inletting or outletting function? YES NO Remove Sediment Sediment cleaned out to designed pond shape and depth Pond reseeded if necessary to control erosion. Liner (If Applicable) Liner is visible? YES NO More than three 1/4-inch holes in it? YES NO Rehabilitate the Liner Liner repaired or replaced. Liner is fully covered. ---PAGE BREAK--- Operations/Maintenance BMPs Detention Ponds Rev _ 12/30/2010 page 4 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Pond Berms (Dikes) Settlements Settlement is apparent? YES NO Settlement > 4 inches lower than the design elevation? YES NO Measure berm to determine amount of settlement. An engineer should be consulted to determine the source of the settlement. Dike is built back to the design elevation. Piping Discernable water flow through pond berm? YES NO Ongoing erosion with the potential for erosion to continue? YES NO Stabilize Berm Recommend a Goetechnical engineer be called in to inspect and evaluate condition and recommend repair of condition. Use appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. Emergency Overflow/Spillway and Berms over 4 feet in height. Tree Growth Tree growth on emergency spillway? YES NO Tree growth on berms over 4 feet in height? (may lead to piping) YES NO Trees should be removed. If root system is small (base less than 4 inches) the root system may be left in place. Otherwise the roots should be removed and the berm restored. An engineer should be consulted for proper berm/spillway restoration. ---PAGE BREAK--- Operations/Maintenance BMPs Detention Ponds Rev _ 12/30/2010 page 5 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Emergency Overflow/Spillway and Berms over 4 feet in height. (cont.) Piping Discernable water flow through pond berm? YES NO Ongoing erosion with the potential for erosion to continue? YES NO Stabilize Berm Recommend a Goetechnical engineer be called in to inspect and evaluate condition and recommend repair of condition. Use appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. Emergency Overflow/ Spillway Emergency Overflow/Spillway Only one layer of rock exists above native soil in area five square feet or larger? YES NO Native soil exposed at the top of out flow path of spillway? YES NO Restore Emergency Overflow/Spillway Rocks and pad depth are restored to design standards. Missing Rocks Rocks Missing? YES NO Replace rocks as necessary. Erosion Erosion 2 inches deep? YES NO Cause or potential still present? YES NO Stabilize Slopes Use appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. ---PAGE BREAK--- Operations/Maintenance BMPs Infiltration Ponds Rev _ 12/30/2010 page 6 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions General Trash & Debris Trash & Debris present? 5 ft3 /1,000 ft2 5 ft3 /1,000 ft2 Clear Trash and Debris Perform maintenance now Perform at next scheduled maintenance Poisonous/Noxious Vegetation Poisonous or nuisance vegetation present? YES NO Noxious weeds present? YES NO Eradicate or begin control effort Initiate IPM policies Contaminants and Pollution Evidence of oil, gasoline or other pollutants? YES NO Remove Perform removal/cleanup Rodent Holes Does the facility act as a dam or berm? YES NO Evidence of rodent holes? YES NO Evidence of water piping through dam or berm via rodent holes? YES NO Eliminate rodents and repair dam or berm (coordinate with Ecology Dam Safety Office if pond exceeds 10 acre-feet). Initiate IPM policies Engineers review and recommended actions ---PAGE BREAK--- Operations/Maintenance BMPs Infiltration Ponds Rev _ 12/30/2010 page 7 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Storage Area Sediment Water ponding in infiltration pond after rainfall ceases? YES NO Two inches or more sediment? YES NO Remove Sediment Remove and/or clean so that infiltration system works according to design. Filter Bags (if applicable) Filled with Sediment and Debris Bag(s) > 1/2 full? YES NO Maintain filter bag Replace filter bag or Redesign System Rock Filters Sediment and Debris Little or no water flows through filter? YES NO Replace Gravel in rock filter is replaced. Side Slopes of Pond Erosion Erosion 2 inches deep? YES NO Cause or potential still present? YES NO Stabilize Slopes Use appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. Emergency Overflow Spillway and Berms over 4 feet in height. Tree Growth Tree growth on emergency spillway? YES NO Trees should be removed. If root system is small (base less than 4 inches) the root system may be left in place. Otherwise the roots should be removed and the berm restored. ---PAGE BREAK--- Operations/Maintenance BMPs Infiltration Ponds Rev _ 12/30/2010 page 8 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Emergency Overflow Spillway and Berms over 4 feet in height. (cont.) Tree Growth (cont.) Tree growth on berms over 4 feet in height? (may lead to piping) YES NO An engineer should be consulted for proper berm/spillway restoration. Piping Discernable water flow through pond berm? YES NO Ongoing erosion with the potential for erosion to continue? YES NO Stabilize Berm Recommend a Goetechnical engineer be called in to inspect and evaluate condition and recommend repair of condition. Use appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. Emergency Overflow Spillway Rock Missing Rocks Missing? YES NO Replace rocks as necessary. Erosion Erosion 2 inches deep? YES NO Cause or potential still present? YES NO Stabilize Slopes Use appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. ---PAGE BREAK--- Operations/Maintenance BMPs Infiltration Ponds Rev _ 12/30/2010 page 9 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Pre-settling Ponds Facility filled with Sediment and/or debris Sediment > 6 inches? YES NO Sediment is removed. Restore to designed bottom elevation. Vaults Sump filled with Sediment and/or debris Exceeds designed depth of sediment trap? YES NO Sediment is removed. Vactor sediment and/or debris. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Detention Systems Rev _ 12/30/2010 page 10 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Storage Area Plugged Air Vents Vent blockage > ½ of the diameter? YES NO Vent damaged? YES NO Restore the vent to proper function. Clear blockage Repair damage. Debris and Sediment Sediment depth > 10% of the diameter of the storage area for 1/2 length of storage vault? YES NO Any point depth > 15% of diameter? YES NO All sediment and debris removed from storage area. Perform maintenance now Perform at next scheduled maintenance Joints Between Tank/Pipe Section Openings or voids allowing material to be transported into facility? YES NO Eliminate openings and voids. All joint between tank/pipe sections are sealed. Consult an engineer to determine structural stability. (required) Tank Pipe Bent Out of Shape Any part of tank/pipe is bent out of shape > 10% of its design shape? YES NO Tank/pipe repaired or replaced to design. Review required by engineer to determine structural stability ---PAGE BREAK--- Operations/Maintenance BMPs Closed Detention Systems Rev _ 12/30/2010 page 11 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Storage Area (cont.) Vault Structure Includes Cracks in Wall, Bottom, Damage to Frame and/or Top Slab Cracks wider than 1/2-inch (including inlet/outlet pipes)? YES NO Evidence of soil particles entering the structure through the cracks? YES NO Vault is not structurally sound? YES NO Vault replaced or repaired to design specifications and is structurally sound. Cracks > 1/4-inch wide at the joint of the inlet/outlet pipe must be repaired or filled. Repair / fill cracks. Consult engineer for structural integrity. Manhole Cover Not in Place Cover is missing or only partially in place? YES NO Manhole is closed. Repair or replace manhole cover. Locking Mechanism Not Working Mechanism can be opened by one maintenance person with proper tools? YES NO Bolts into frame < 1/2 inch of thread? YES NO Mechanism opens with proper tools. Repair/replace mechanism. Replace with longer bolts. Cover Difficult to Remove One maintenance person can remove lid after applying normal lifting pressure? YES NO Repair lid to prevent sealing off access for maintenance. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Detention Systems Rev _ 12/30/2010 page 12 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Manhole (cont.) Ladder Rungs Unsafe Ladder is unsafe? YES NO Missing rungs? YES NO Rungs misaligned or not securely attached to structure wall? YES NO Rungs rusted or cracked? YES NO Ladder meets design standards. Allows maintenance person safe access. Repair or replace ladder or rungs. Catch Basins General Trash & Debris Trash or debris which is located immediately in front of the catch basin opening? YES NO Trash or debris blocking inletting capacity of the basin by more than 10%. YES NO Clear trash and debris. Vactor if necessary. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Detention Systems Rev _ 12/30/2010 page 13 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Catch Basins General (cont.) Trash & Debris (cont.) Material > 60% of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of six inches clearance from the debris surface to the invert of the lowest pipe. YES NO Clear trash and debris. Vactor if necessary. Trash or debris in any inlet or outlet pipe blocking > 1/3 of its height. YES NO Clear trash and debris. Vactor if necessary. Dead animals or vegetation causing odors or dangerous gases? YES NO Remove dead animals or vegetation. Sediment Sediment > 60% of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of 6 inches clearance from the sediment surface to the invert of the lowest pipe? YES NO Clear trash and debris. Vactor if necessary. Structure Damage to Frame and/or Top Slab Top slab has holes > 2 in2? YES NO Repair or fill holes. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Detention Systems Rev _ 12/30/2010 page 14 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Catch Basins General (cont.) Structure Damage to Frame and/or Top Slab (cont.) Cracks > 1/4 inch? YES NO Repair or fill cracks. Frame sitting flush on top slab? YES NO Frame securely attached? YES NO Reattach and secure frame. Fractures or Cracks in Basin Walls/Bottom Structure is unsound? YES NO Replace or repair to design standards. Grout separated? YES NO Grout cracked > 1/2 inch and longer than 1 ft. at the joint of any inlet/outlet pipe? YES NO Evidence of soil particles entering catch basin through cracks? YES NO Regrout and secure pipe at basin wall. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Detention Systems Rev _ 12/30/2010 page 15 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Catch Basins General (cont.) Settlement/ Misalignment Basin has failed creating a safety, function, or design problem? YES NO Replace or repair basin to design standards. Vegetation Vegetation blocking > 10% of the basin opening? YES NO Remove vegetation. Vegetation growing in inlet/outlet pipe joints > 6 in. tall and < 6 in. apart? YES NO Remove vegetation. Cut roots. Contamination and Pollution Evidence of oil, gasoline or other pollutants? YES NO Remove Perform removal/cleanup Catch Basin Cover Cover Not in Place Cover is missing? YES NO Cover is partially in place? YES NO Replace cover. Reposition cover correctly. Locking Mechanism Not Working Mechanism can be opened by one maintenance person with proper tools? YES NO Mechanism opens with proper tools. Repair/replace mechanism. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Detention Systems Rev _ 12/30/2010 page 16 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Catch Basin Cover (cont.) Locking Mechanism Not Working (cont.) Bolts into frame < 1/2 inch of thread? YES NO Replace with longer bolts. Cover Difficult to Remove One maintenance person can remove lid after applying normal lifting pressure? YES NO Repair lid to prevent sealing off access for maintenance. Ladder Ladder Rungs Unsafe Ladder is unsafe? YES NO Missing rungs? YES NO Rungs misaligned or not securely attached to structure wall? YES NO Rungs rusted or cracked? YES NO Ladder must meet design standards and allow maintenance person safe access. Repair or replace ladder or rungs. Metal Grates (If Applicable) Grate opening Unsafe Grate > 7/8 inch? YES NO Grate opening meets design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Detention Systems Rev _ 12/30/2010 page 17 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Metal Grates (If Applicable) (cont.) Trash and Debris Trash and debris blocking > 20% of grate surface inletting capacity? YES NO Clear grate of trash and debris. Grate damaged or Missing. Grate missing? YES NO Broken member(s) of the grate? YES NO Replace grate. Repair grate to meet design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Tanks and Vaults Rev _ 12/30/2010 page 18 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Storage Area Plugged Air Vents Vent blockage > ½ of the diameter? YES NO Vent damaged? YES NO Restore the vent to proper function. Clear blockage Repair damage. Debris and Sediment Sediment depth > 10% of the diameter of the storage area for 1/2 length of storage vault? YES NO Any point depth > 15% of diameter? YES NO All sediment and debris removed from storage area. Perform maintenance now Perform at next scheduled maintenance Joints Between Tank/Pipe Section Openings or voids allowing material to be transported into facility? YES NO Eliminate openings and voids. All joint between tank/pipe sections are sealed. Consult an engineer to determine structural stability. (required) Tank Pipe Bent Out of Shape Any part of tank/pipe is bent out of shape > 10% of its design shape? YES NO Tank/pipe repaired or replaced to design. Review required by engineer to determine structural stability ---PAGE BREAK--- Operations/Maintenance BMPs Closed Tanks and Vaults Rev _ 12/30/2010 page 19 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Storage Area (cont.) Vault Structure Includes Cracks in Wall, Bottom, Damage to Frame and/or Top Slab Cracks wider than 1/2-inch (including inlet/outlet pipes)? YES NO Evidence of soil particles entering the structure through the cracks? YES NO Vault is not structurally sound? YES NO Vault replaced or repaired to design specifications and is structurally sound. Cracks > 1/4-inch wide at the joint of the inlet/outlet pipe must be repaired or filled. Repair / fill cracks. Consult engineer for structural integrity. Manhole Cover Not in Place Cover is missing or only partially in place? YES NO Manhole is closed. Repair or replace manhole cover. Locking Mechanism Not Working Mechanism can be opened by one maintenance person with proper tools? YES NO Bolts into frame < 1/2 inch of thread? YES NO Mechanism opens with proper tools. Repair/replace mechanism. Replace with longer bolts. Cover Difficult to Remove One maintenance person can remove lid after applying normal lifting pressure? YES NO Repair lid to prevent sealing off access for maintenance. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Tanks and Vaults Rev _ 12/30/2010 page 20 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Manhole (cont.) Ladder Rungs Unsafe Ladder is unsafe? YES NO Missing rungs? YES NO Rungs misaligned or not securely attached to structure wall? YES NO Rungs rusted or cracked? YES NO Ladder must meet design standards. Ladders must allow maintenance person safe access. Repair or replace ladder or rungs. Catch Basins General Trash & Debris Trash or debris which is located immediately in front of the catch basin opening? YES NO Trash or debris blocking inletting capacity of the basin by more than 10%. YES NO Clear trash and debris. Vactor if necessary. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Tanks and Vaults Rev _ 12/30/2010 page 21 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Catch Basins General (cont.) Trash & Debris (cont.) Material > 60% of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of six inches clearance from the debris surface to the invert of the lowest pipe? YES NO Clear trash and debris. Vactor if necessary. Trash or debris in any inlet or outlet pipe blocking > 1/3 of its height. YES NO Clear trash and debris. Vactor if necessary. Dead animals or vegetation causing odors or dangerous gases? YES NO Remove dead animals or vegetation. Sediment Sediment > 60% of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of 6 inches clearance from the sediment surface to the invert of the lowest pipe? YES NO Clear trash and debris. Vactor if necessary. Structure Damage to Frame and/or Top Slab Top slab has holes > 2 in2? YES NO Repair or fill holes. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Tanks and Vaults Rev _ 12/30/2010 page 22 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Catch Basins General (cont.) Structure Damage to Frame and/or Top Slab (cont.) Cracks > 1/4 in? YES NO Repair or fill cracks. Frame sitting flush on top slab? YES NO Frame securely attached? YES NO Reattach and secure frame. Fractures or Cracks in Basin Walls/Bottom Structure is unsound? YES NO Grout separated? YES NO Grout cracked > 1/2 inch and longer than 1 ft. at the joint of any inlet/outlet pipe? YES NO Evidence of soil particles entering catch basin through cracks? YES NO Replace or repair to design standards. Regrout and secure pipe at basin wall. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Tanks and Vaults Rev _ 12/30/2010 page 23 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Catch Basins General (cont.) Settlement/ Misalignment Basin has failed creating a safety, function, or design problem? YES NO Replace or repair basin to design standards. Vegetation Vegetation blocking > 10% of the basin opening? YES NO Vegetation growing in inlet/outlet pipe joints > 6 in. tall and < 6 in. apart? YES NO Remove vegetation. Remove vegetation. Cut roots. Contamination and Pollution Evidence of oil, gasoline or other pollutants? YES NO Remove Perform removal/cleanup Catch Basin Cover Cover Not in Place Cover is missing? YES NO Cover is partially in place? YES NO Replace cover. Reposition cover correctly. Locking Mechanism Not Working Mechanism can be opened by one maintenance person with proper tools? YES NO Mechanism opens with proper tools. Repair/replace mechanism. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Tanks and Vaults Rev _ 12/30/2010 page 24 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Catch Basin Cover (cont.) Locking Mechanism Not Working (cont.) Bolts into frame < 1/2 inch of thread? YES NO Replace with longer bolts. Cover Difficult to Remove One maintenance person can remove lid after applying normal lifting pressure? YES NO Repair lid to prevent sealing off access for maintenance. Ladder Ladder Rungs Unsafe Ladder is unsafe? YES NO Missing rungs? YES NO Rungs misaligned or not securely attached to structure wall? YES NO Rungs rusted or cracked? YES NO Ladder must meet design standards and allow maintenance person safe access. Repair or replace ladder or rungs. Metal Grates (If Applicable) Grate opening Unsafe Grate > 7/8 inch? YES NO Grate opening meets design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Closed Tanks and Vaults Rev _ 12/30/2010 page 25 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Metal Grates (If Applicable) (cont.) Trash and Debris Trash and debris blocking > 20% of grate surface inletting capacity? YES NO Clear grate of trash and debris. Grate damaged or Missing. Grate missing? YES NO Broken member(s) of the grate? YES NO Replace grate. Repair grate to meet design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 26 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General Trash and Debris (Includes Sediment) Material > 25% of sump depth? YES NO Material < 1 ft below orifice plate? YES NO Remove blockages from control structure orifice. Remove or vactor trash and debris. Structural Damage Structure securely attached to manhole wall? YES NO Secure structure to wall and outlet pipe. Structure is in upright position? 10% from plumb). YES NO Align structure in correct position. Connections to outlet pipe are watertight? YES NO Signs of rust? YES NO Seal connections to outlet pipe. Repair or replace structure to function as designed. Any holes--other than designed holes--in the structure? YES NO Repair or plug hole(s), other than designed holes. Cleanout Gate Damaged or Missing Cleanout gate watertight? YES NO Repair gate to design function (watertight seal can be achieved). ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 27 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions Cleanout Gate (cont.) Damaged or Missing (cont.) Cleanout gate missing. YES NO Replace gate. Gate moves up and down by one maintenance person? YES NO Perform maintenance now Perform at next scheduled maintenance Chain/rod leading to gate is missing? YES NO Chain/rod leading to gate is damaged? YES NO Gate is repaired or replaced to meet design standards. Gate is rusted over 50% of its surface area? YES NO Gate is repaired or replaced to meet design standards. Orifice Plate Damaged or Missing Missing orifice plate? YES NO Out of place orifice plate? YES NO Bent orifice plate? YES NO Orifice plate is repaired or replaced to meet design standards. Orifice plate is repaired or replaced to meet design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 28 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions Orifice Plate (cont.) Obstructions Trash, debris, sediment, or vegetation blocking the plate? YES NO Perform maintenance now Perform at next scheduled maintenance Overflow Pipe Obstructions Any trash or debris blocking (or having the potential of blocking) the overflow pipe? YES NO Perform maintenance now Perform at next scheduled maintenance Manhole Cover Not in Place Cover is missing or only partially in place? YES NO Manhole is closed. Repair or replace manhole cover. Locking Mechanism Not Working Mechanism can be opened by one maintenance person with proper tools? YES NO Bolts into frame < 1/2 inch of thread? YES NO Mechanism opens with proper tools. Repair/replace mechanism. Replace with longer bolts. Cover Difficult to Remove One maintenance person can remove lid after applying normal lifting pressure? YES NO Repair lid to prevent sealing off access for maintenance. ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 29 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Ladder Rungs Unsafe Ladder is unsafe? YES NO Missing rungs? YES NO Rungs misaligned or not securely attached to structure wall? YES NO Rungs rusted or cracked? YES NO Ladder meets design standards. Allows maintenance person safe access. Repair or replace ladder or rungs. Catch Basin (General) Trash & Debris Trash or debris which is located immediately in front of the catch basin opening? YES NO Trash or debris blocking inletting capacity of the basin by more than 10%. YES NO Clear trash and debris. Vactor if necessary. ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 30 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Material > 60% of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of six inches clearance from the debris surface to the invert of the lowest pipe. YES NO Clear trash and debris. Vactor if necessary. Trash or debris in any inlet or outlet pipe blocking > 1/3 of its height. YES NO Clear trash and debris. Vactor if necessary. Dead animals or vegetation causing odors or dangerous gases? YES NO Remove dead animals or vegetation. Sediment Sediment > 60% of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of 6 inches clearance from the sediment surface to the invert of the lowest pipe? YES NO Clear trash and debris. Vactor if necessary. ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 31 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Structure Damage to Frame and/or Top Slab Top slab has holes > 2 in2? YES NO Cracks > 1/4 inch? YES NO Repair or fill holes. Repair or fill cracks. Frame sitting flush on top slab? YES NO Frame securely attached? YES NO Reattach and secure frame. Fractures or Cracks in Basin walls/Bottom Structure is unsound? YES NO Grout separated? YES NO Grout cracked > 1/2 inch and longer than 1 ft. at the joint of any inlet/outlet pipe? YES NO Evidence of soil particles entering catch basin through cracks? YES NO Replace or repair to design standards. Regrout and secure pipe at basin wall. ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 32 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Settlement/ Misalignment Basin has failed creating a safety, function, or design problem? YES NO Replace or repair basin to design standards. Vegetation Vegetation blocking > 10% of the basin opening? YES NO Vegetation growing in inlet/outlet pipe joints > 6 in. tall and < 6 in. apart? YES NO Remove vegetation. Cut roots. Contamination and Pollution Evidence of oil, gasoline or other pollutants? YES NO Remove Perform removal/cleanup Catch Basin Cover Cover Not in Place Cover is missing? YES NO Cover is partially in place? YES NO Replace cover. Reposition cover correctly. ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 33 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Locking Mechanism Not Working Mechanism can be opened by one maintenance person with proper tools? YES NO Bolts into frame < 1/2 inch of thread? YES NO Mechanism opens with proper tools. Repair/replace mechanism. Replace with longer bolts. Cover Difficult to Remove One maintenance person can remove lid after applying normal lifting pressure? YES NO Repair lid to prevent sealing off access for maintenance. Ladder Ladder Rungs Unsafe Ladder is unsafe? YES NO Missing rungs? YES NO Rungs misaligned or not securely attached to structure wall? YES NO Rungs rusted or cracked? YES NO Ladder must meet design standards and allow maintenance person safe access. Repair or replace ladder or rungs. Metal Grates (If Applicable) Grate opening Unsafe Grate > 7/8 inch? YES NO Grate opening meets design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Control Structure /Flow Restrictor Rev _ 12/30/2010 page 34 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Trash and Debris Trash and debris blocking > 20% of grate surface inletting capacity? YES NO Clear grate of trash and debris. Damaged or Missing. Grate missing? YES NO Broken member(s) of the grate? YES NO Replace grate. Repair grate to meet design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Catch Basins Rev _ 12/30/2010 page 35 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions General Trash & Debris Trash or debris which is located immediately in front of the catch basin opening? YES NO Trash or debris blocking inletting capacity of the basin by more than 10%? YES NO Clear trash and debris. Vactor if necessary. Material > 60% of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of six inches clearance from the debris surface to the invert of the lowest pipe? YES NO Clear trash and debris. Vactor if necessary. Trash or debris in any inlet or outlet pipe blocking > 1/3 of its height. YES NO Clear trash and debris. Vactor if necessary. Dead animals or vegetation causing odors or dangerous gases? YES NO Remove dead animals or vegetation. ---PAGE BREAK--- Operations/Maintenance BMPs Catch Basins Rev _ 12/30/2010 page 36 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Sediment Sediment > 60% of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of 6 inches clearance from the sediment surface to the invert of the lowest pipe? YES NO Clear trash and debris. Vactor if necessary. Structure Damage to Frame and/or Top Slab Top slab has holes > 2 in2 ? YES NO Cracks > 1/4 inch? YES NO Repair or fill holes. Repair or fill cracks. Frame sitting flush on top slab? YES NO Frame securely attached? YES NO Reattach and secure frame. Fractures or Cracks in Basin Walls/Bottom Structure is unsound? YES NO Replace or repair to design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Catch Basins Rev _ 12/30/2010 page 37 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Fractures or Cracks in Basin Walls/Bottom Grout separated? YES NO Grout cracked > 1/2 inch and longer than 1 ft. at the joint of any inlet/outlet pipe? YES NO Evidence of soil particles entering catch basin through cracks? YES NO Regrout and secure pipe at basin wall. Settlement/ Misalignment Basin has failed creating a safety, function, or design problem? YES NO Replace or repair basin to design standards. Vegetation Vegetation blocking > 10% of the basin opening? YES NO Remove vegetation. Vegetation growing in inlet/outlet pipe joints > 6 in. tall and < 6 in. apart? YES NO Remove vegetation. Cut roots. ---PAGE BREAK--- Operations/Maintenance BMPs Catch Basins Rev _ 12/30/2010 page 38 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Contamination and Pollution Evidence of oil, gasoline or other pollutants? YES NO Remove Perform removal/cleanup Catch Basin Cover Cover Not in Place Cover is missing? YES NO Cover is partially in place? YES NO Replace cover. Reposition cover correctly. Locking Mechanism Not Working Mechanism can be opened by one maintenance person with proper tools? YES NO Bolts into frame < 1/2 inch of thread? YES NO Mechanism opens with proper tools. Repair/replace mechanism. Replace with longer bolts. Cover Difficult to Remove One maintenance person can remove lid after applying normal lifting pressure? YES NO Repair lid to prevent sealing off access for maintenance. ---PAGE BREAK--- Operations/Maintenance BMPs Catch Basins Rev _ 12/30/2010 page 39 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Ladder Ladder Rungs Unsafe Ladder is unsafe? YES NO Missing rungs? YES NO Rungs misaligned or not securely attached to structure wall? YES NO Rungs rusted or cracked? YES NO Ladder must meet design standards and allow maintenance person safe access. Repair or replace ladder or rungs. Metal Grates (If Applicable) Grate opening Unsafe Grate > 7/8 inch? YES NO Grate opening meets design standards. Trash and Debris Trash and debris blocking > 20% of grate surface inletting capacity? YES NO Clear grate of trash and debris. Damaged or Missing. Grate missing? YES NO Broken member(s) of the grate? YES NO Replace grate. Repair grate to meet design standards. ---PAGE BREAK--- Operations/Maintenance BMPs Debris Barriers Rev _ 12/30/2010 page 40 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions General Trash and Debris Trash or debris plugging > 20% of the openings in the barrier? YES NO Clear debris. Metal Damaged/Missing Bars. Bars bent > 3 inches? YES NO Bend bar(s) to < ¾ in. Replace bar(s) Bars are damaged? YES NO Entire barrier missing? YES NO Repair or replace bars. Bars are loose? YES NO Rust is causing 50% deterioration to any part of barrier? YES NO Repair or replace bars. Inlet/Outlet Pipe Debris barrier missing? YES NO Debris barrier attached to pipe? YES NO Replace barrier. Secure barrier to pipe. ---PAGE BREAK--- Operations/Maintenance BMPs Energy Dissipaters Rev _ 12/30/2010 page 41 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions External: Rock Pad Missing or Moved Rock Only one layer of rock exists above native soil in area five square feet or larger? YES NO Native soil exposed at the top of out flow path of spillway? YES NO Replace rock pad to design standards. Erosion Soil erosion in or adjacent to rock pad? YES NO Replace rock pad to design standards. Dispersion Trench Pipe Plugged with Sediment Sediment > 20% of the design depth? YES NO Clean/flush pipe so that it matches design. Not Discharging Water Properly Visual evidence of water discharging at concentrated points along trench (normal condition is a “sheet flow” of water along trench)? YES NO Redesign or rebuild trench to standards. Perforations Plugged. Perforations > ½ plugged in pipe? YES NO Clean or replace pipe. ---PAGE BREAK--- Operations/Maintenance BMPs Energy Dissipaters Rev _ 12/30/2010 page 42 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions Dispersion Trench (cont.) Water Flows Out Top of “Distributor” Catch Basin. Water flowing out during any storm less than the design storm? YES NO Causing or likely to cause damage? YES NO Facility rebuilt or redesigned to standards. Receiving Area Over-Saturated Causing or has potential of causing landslide problems? YES NO Consult engineer for review. Internal: Manhole/Chamber Worn or Damaged Post, Baffles, Side of Chamber Structure deteriorated to ½ of original size? YES NO Concentrated worn spot > 1 ft2? YES NO Structure appears sound? YES NO Replace structure to designed standards. ---PAGE BREAK--- Operations/Maintenance BMPs Typical Biofiltration Swale Rev _ 12/30/2010 page 43 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions General Sediment Accumulation on Grass Sediment depth > 2 in? YES NO Remove sediment deposits on grass treatment area of the bio- swale. When finished, swale should be level from side to side and drain freely toward outlet. There should be no areas of standing water once inflow has ceased. Standing Water Water in the swale between storms? YES NO Water drains freely? YES NO Remove sediment or trash blockages. Improve grade from head to foot of swale. Remove clogged check dams Add under drains or convert to a wet biofiltration swale. Flow spreader Flow spreader uneven? YES NO Flow spreader clogged? YES NO Flows are uniformly distributed through entire swale width? YES NO Level the spreader. Clean so that flows are spread evenly over entire swale width. Constant Baseflow Eroded and/or muddy channel has formed in the swale bottom? YES NO Add a low-flow pea-gravel drain the length of the swale By-pass the baseflow around the swale. ---PAGE BREAK--- Operations/Maintenance BMPs Typical Biofiltration Swale Rev _ 12/30/2010 page 44 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions General (cont.) Poor Vegetation Coverage Grass is sparse? YES NO Bare or eroded patches occur in > 10% of the swale bottom? YES NO Determine why grass growth is poor and correct that condition. Re-plant with plugs of grass from the upper slope: plant in the swale bottom at 8-inch intervals. Re-seed into loosened, fertile soil. Vegetation Grass > 10-inches? YES NO Weeds and/or other vegetation are taking over? YES NO Mow vegetation. Remove nuisance vegetation so that flow not impeded. Grass should be mowed to a height of 3 to 4 inches. Remove grass clippings. Excessive Shading Grass growth is poor because sunlight does not reach swale? YES NO Trim back over-hanging limbs. Remove brushy vegetation on adjacent slopes. Inlet/Outlet Inlet/outlet areas clogged with sediment and/or debris? YES NO Remove material. Trash and Debris Accumulation Trash and debris accumulated in the bio-swale? YES NO Remove trash and debris from bioswale. ---PAGE BREAK--- Operations/Maintenance BMPs Typical Biofiltration Swale Rev _ 12/30/2010 page 45 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Actions General (cont.) Erosion/Scouring Eroded or scoured swale bottom due to flow channelization, or higher flows? YES NO For ruts or bare areas < 12 in. wide: Repair the damaged area by filling with crushed gravel. For rut or bare spots > 12 in. wide: The swale should be re-graded and re-seeded. For smaller bare areas: Overseed when bare spots are evident, or take plugs of grass from the upper slope and plant in the swale bottom at 8-inch intervals. ---PAGE BREAK--- Operations/Maintenance BMPs Wet Biofiltration Swale Rev _ 12/30/2010 page 46 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General Sediment Accumulation Sediment depth > 2 inches in 10% of the swale treatment area. YES NO Remove sediment deposits in treatment area. Water Depth Water not retained to a depth of about 4 inches during the wet season? YES NO Build up or repair outlet berm so that water is retained in the wet swale. Wetland Vegetation Vegetation is sparse and does not provide adequate filtration? YES NO Vegetation is crowded out by very dense clumps of cattail, which do not allow water to flow through the clumps? YES NO Determine cause of lack of vigor of vegetation and correct. Replant as needed. For excessive cattail growth: Cut cattail shoots back and compost off-site. (Normally wetland vegetation does not need to be harvested unless die-back is causing oxygen depletion in waters). Inlet/Outlet Inlet/outlet area clogged with sediment and/or debris? YES NO Remove clogging or blockage in the inlet and outlet areas. Trash and Debris Accumulation Trash & Debris present? 5 ft3 /1,000 ft2 5 ft3 /1,000 ft2 Clear Trash and Debris Perform maintenance now Perform at next scheduled maintenance ---PAGE BREAK--- Operations/Maintenance BMPs Wet Biofiltration Swale Rev _ 12/30/2010 page 47 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Erosion/Scouring Swale has eroded or scoured due to flow channelization, or higher flows? YES NO Check design flows to assure swale is large enough to handle flows. By-pass excess flows. Enlarge swale. Replant eroded areas with fibrous-rooted plants. ---PAGE BREAK--- Operations/Maintenance BMPs Filter Strips Rev _ 12/30/2010 page 48 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General Sediment Accumulation on Grass Sediment depth > 2 in? YES NO Remove sediment deposits Re-level so slope is even and flows pass evenly through strip. Vegetation Grass > 10 in? YES NO Weeds and/or other vegetation are taking over? YES NO Mow grass. Control nuisance vegetation. Grass should be mowed to a height between 3-4 inches. Trash and Debris Accumulation Trash and debris accumulated on the filter strip? YES NO Remove trash and Debris from filter. Erosion/Scouring Eroded or scoured areas due to flow channelization, or higher flows? YES NO For ruts or bare areas < 12 in. wide: Repair the damaged area by filling with crushed gravel. For rut or bare spots > 12 in. wide: The swale should be re-graded and re-seeded. For smaller bare areas: Overseed when bare spots are evident, or take plugs of grass from the upper slope and plant in the swale bottom at 8-inch intervals. Flow spreader Flow spreader uneven or clogged? YES NO Level the spreader. Clean so that flows are spread evenly over entire filter width. ---PAGE BREAK--- Operations/Maintenance BMPs Wet Ponds Rev _ 12/30/2010 page 49 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General Water level First cell is empty / doesn't hold water? YES NO Line the first cell to maintain at least 4 feet of water. Trash and Debris Accumulation > 1 ft3 per 1000 ft2 of pond area? YES NO Remove trash and debris from pond. Inlet/Outlet Pipe Inlet/Outlet pipe clogged with sediment and/or debris material? YES NO Clear and remove clogging or blockage in the inlet and outlet piping. Sediment Accumulation in Pond Bottom Is > depth of sediment zone plus 6- inches? YES NO Remove sediment from pond bottom. Oil Sheen on Water Prevalent and visible oil sheen? YES NO Remove using oil-absorbent pads or vactor truck. Locate and correct source of contaminant. Erosion Erosion of the pond’s side slopes and/or scouring of the pond bottom, exceeds 6-inches? YES NO Continued erosion is prevalent? YES NO Stabilize slopes using proper erosion control measures and repair methods. ---PAGE BREAK--- Operations/Maintenance BMPs Wet Ponds Rev _ 12/30/2010 page 50 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Settlement of Pond Dike/Berm Settling < 4 in. or lower than the design elevation? YES NO Dike/berm is unsound? YES NO Repair dike/berm to specifications. Internal Berm Berm dividing cells level? YES NO Berm surface is leveled so that water flows evenly over entire length of berm. Overflow Spillway Rock is missing? YES NO Soil is exposed at top of spillway or outside slope. YES NO Rocks replaced to specifications. ---PAGE BREAK--- Operations/Maintenance BMPs Wet Vaults Rev _ 12/30/2010 page 51 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General Trash/Debris Accumulation Trash and debris accumulated in vault, pipe or inlet/outlet? YES NO Remove trash and debris from vault. Sediment Accumulation in Vault Sediment > depth of the sediment zone plus 6-inches? YES NO Remove sediment from vault. Damaged Pipes Inlet/outlet piping damaged? YES NO Repair and/or replace pipe. Access Cover Damaged/Not Working Cover cannot be opened or removed by one person? YES NO Repair or replace pipe to proper working specifications. Ventilation Ventilation area blocked or plugged? YES NO Remove or clear blocking material from ventilation area. Refer to design specifications). Vault Structure Damage -Includes Cracks in Walls Bottom, Damage to Frame and/or Top Slab Vault is structurally sound? YES NO Replace or repair vault to meet design specifications. Consult engineer to determine the structural integrity. Cracks wider than 1/2-inch at the joint of any inlet/outlet pipe? YES NO Repair vault so that no cracks exist wider than 1/4-inch at the joint of the inlet/outlet pipe. ---PAGE BREAK--- Operations/Maintenance BMPs Wet Vaults Rev _ 12/30/2010 page 52 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Vault Structure Damage -Includes Cracks in Walls Bottom, Damage to Frame and/or Top Slab (cont.) Evidence of soil particles entering through the cracks? YES NO Repair vault so that no cracks exist wider than 1/4-inch at the joint of the inlet/outlet pipe. Baffles Baffles corroding, cracking, warping and/or showing signs of failure? YES NO Repair or replace baffles to specifications. Access Ladder Damage Ladder is corroded or deteriorated? YES NO Ladder not functioning properly? YES NO Ladder not attached to structure wall? YES NO Missing rungs, has cracks and/or misaligned? YES NO Confined space warning sign visible? YES NO Replace or repair ladder to specifications, and is safe to use as determined by inspection personnel. Replace sign warning of confined space entry requirements. Ladder and entry notification must comply with OSHA standards. ---PAGE BREAK--- Operations/Maintenance BMPs Sand Filters - Open Rev _ 12/30/2010 page 53 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions Above Ground (open sand filter) Sediment Accumulation on top layer Sediment depth > ½ in? YES NO Remove sediment deposit on grass layer of sand filter that would impede permeability of the filter section. Trash and Debris Accumulations Trash and debris accumulated on sand filter bed? YES NO Remove trash and debris from sand filter bed. Sediment/Debris in Clean-Outs Clean-outs full or partially plugged with sediment and/or debris? YES NO Remove sediment from clean- outs. Sand Filter Media Drawdown of water through the sand filter media takes longer than 24-hours? YES NO Flow through the overflow pipes occurs frequently. YES NO Top several inches of sand are scraped. May require replacement of entire sand filter depth depending on extent of plugging. Consult an engineer for review. Prolonged Flows Sand is saturated and does not dry out between storms due? YES NO Limit low and continuous flows to a small portion of the facility by using a low wooden divider or depressed sand surface. ---PAGE BREAK--- Operations/Maintenance BMPs Sand Filters - Open Rev _ 12/30/2010 page 54 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions Above Ground (open sand filter) (cont.) Short Circuiting Flows have become concentrated over one section of the sand filter rather than dispersed? YES NO Disperse flow across the entire filter area. Erosion Damage to Slopes Erosion > 2 in. deep? YES NO Potential for continued erosion is evident? YES NO Stabilize slope using proper erosion control measures. Rock Pad Missing or Out of Place Soil beneath the rock is visible? YES NO Replace or rebuild rock pad to design specifications. Flow Spreader Flow spreader uneven or clogged? YES NO Level and clean spreader so that flows are spread evenly over sand filter. Damaged Pipes Piping is crushed or deformed > 20%? YES NO Other failure to the piping. YES NO Repair or replace pipe. ---PAGE BREAK--- Operations/Maintenance BMPs Sand Filters - Closed Rev _ 12/30/2010 page 55 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions Below Ground Vault. Sediment Accumulation on Sand Media Section Sediment depth > ½ in.? YES NO Remove sediment deposits on sand filter section that which would impede permeability of the filter section. Sediment Accumulation in Pre-Settling Portion of Vault Sediment in vault bottom > depth of the sediment zone + 6 in? YES NO Remove sediment deposits in first chamber of vault. Trash/Debris Accumulation Trash and debris in vault? YES NO Trash and debris in pipe inlet/outlet? YES NO Remove trash and debris from vault. Remove trash and debris from inlet/outlet piping. Sediment in Drain Pipes/Cleanouts Drain pipes full with sediment and/or debris? YES NO Cleanouts full with sediment and/or debris? YES NO Remove sediment and debris. Short Circuiting Seepage/flow occurring along the vault walls and corners? YES NO Sand eroding near inflow area? YES NO Re-lay sand filter media section and compact along perimeter of vault to form a semi-seal. Add erosion protection to dissipate force of incoming flow and curtail erosion. ---PAGE BREAK--- Operations/Maintenance BMPs Sand Filters - Closed Rev _ 12/30/2010 page 56 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions Below Ground Vault. (cont.) Damaged Pipes Inlet pipe damaged or broken? YES NO Outlet pipe damaged or broken? YES NO Repair and/or replace pipe. Access Cover Damaged/Not Working Cover cannot be opened? YES NO Corrosion/deformation of cover? YES NO Cannot remove cover using normal lifting pressure? YES NO Repair cover to proper working specifications or replaced. Ventilation Ventilation area blocked or plugged? YES NO Remove or clear blocking material from ventilation area. Vault Structure Damaged; Includes Cracks in Walls, Bottom, Damage to Frame and/or Top Slab. Cracks > ½ in? YES NO Evidence of soil particles entering the structure through the cracks? YES NO Repair or replace vault to designed specifications. ---PAGE BREAK--- Operations/Maintenance BMPs Sand Filters - Closed Rev _ 12/30/2010 page 57 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions Below Ground Vault. (cont.) Vault Structure Damaged; Includes Cracks in Walls, Bottom, Damage to Frame and/or Top Slab. (cont.) Vault is structurally sound? YES NO Consult engineer to determine if the vault is structurally sound. Cracks > ½ in. at the joint of any inlet/outlet pipe? YES NO Evidence of soil particles entering through the cracks at the joint of the inlet/outlet pipe? YES NO Repair vault so that no cracks exist > ¼ in. at the joint of the inlet/outlet pipe. Baffles/Internal walls Baffles or walls corroding? YES NO Baffles or walls cracking? YES NO Baffles or walls warping? YES NO Baffles or walls showing signs of failure? YES NO Repair and/or replace baffle to designed specifications. Access Ladder Damaged Ladder is corroded or deteriorated? YES NO Repair and/or replace ladder to specifications. ---PAGE BREAK--- Operations/Maintenance BMPs Sand Filters - Closed Rev _ 12/30/2010 page 58 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions Below Ground Vault. (cont.) Access Ladder Damaged (cont.) Ladder functioning properly? YES NO Ladder securely attached to structure wall? YES NO Missing rungs? YES NO Cracks and/or misaligned? YES NO Repair and/or replace ladder to specifications. ---PAGE BREAK--- Operations/Maintenance BMPs Stormfilter – Leaf Compost Rev _ 12/30/2010 page 59 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Action Below Ground Vault Sediment Accumulation on Media. Sediment > ¼ in? YES NO Remove sediment deposits which could impede permeability of the compost media. Sediment Accumulation in Vault Sediment > 6 inches in first chamber? YES NO Remove sediment deposits in vault bottom of first chamber. Trash/Debris Accumulation Trash and debris accumulated on compost filter bed? YES NO Remove trash and debris from the compost filter bed. Sediment in Drain Pipes/Clean-Outs Drain pipes full with sediment and/or debris? YES NO Clean-outs full with sediment and/or debris? YES NO Remove sediment and debris. Damaged Pipes Pipes crushed or damaged due to corrosion and/or settlement? YES NO Repair or replace pipe. ---PAGE BREAK--- Operations/Maintenance BMPs Stormfilter – Leaf Compost Rev _ 12/30/2010 page 60 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Action Below Ground Vault (cont.) Access Cover Damaged/Not Working Cover cannot be opened? YES NO Corrosion/deformation of cover? YES NO Repair cover to proper working specifications. Replace cover. Vault Structure Includes Cracks in Wall, Bottom, Damage to Frame and/or Top Slab Cracks > ½ in? YES NO Evidence of soil particles entering the structure through the cracks? YES NO Vault is structurally sound? YES NO Replace vault. Repair vault to designed specifications. Consult engineer for determination of structural integrity. Cracks > ½ in. at the joint of any inlet/outlet pipe? YES NO Evidence of soil particles entering through the cracks? YES NO Repair vault so that no cracks exist > ¼ in. at the joint of the inlet/outlet pipe. ---PAGE BREAK--- Operations/Maintenance BMPs Stormfilter – Leaf Compost Rev _ 12/30/2010 page 61 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Action Below Ground Vault (cont.) Baffles Baffles corroding? YES NO Baffles cracking? YES NO Baffles warping? YES NO Baffles showing signs of failure? YES NO Repair or replace baffles to specifications. Access Ladder Damaged Ladder is corroded or deteriorated? YES NO Ladder functioning properly? YES NO Ladder securely attached to structure wall? YES NO Missing rungs? YES NO Replace ladder. Ladder replaced to designed specifications. ---PAGE BREAK--- Operations/Maintenance BMPs Stormfilter – Leaf Compost Rev _ 12/30/2010 page 62 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Conditions Action Below Ground Vault (cont.) Access Ladder Damaged (cont.) Rungs cracked or misaligned? YES NO Replace ladder. Ladder replaced to designed specifications. Below Ground Cartridge Type Compost Media Drawdown of water through the media > 1 hour? YES NO Overflow occurs frequently? YES NO Replace media cartridges. Short Circuiting Flows properly enter filter cartridges? YES NO Replace filter cartridges. ---PAGE BREAK--- Operations/Maintenance BMPs Baffle Oil Water Separator -API Rev _ 12/30/2010 page 63 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General Monitoring Discharge show signs of poor water quality? YES NO Perform maintenance. Sediment Accumulation Sediment bottom of vault > 6 inches in depth? YES NO Remove sediment on vault bottom that could impede flow through the vault and reduce separation efficiency. Trash and Debris Accumulation Trash and debris in vault? YES NO Trash and debris in pipe inlet/outlet? YES NO Remove trash and debris from vault. Remove trash and debris from and inlet/outlet piping. Oil Accumulation Oil accumulations > 1 in. at the surface of the water? YES NO Extract oil from vault by vactoring. Dispose in accordance with state and local rules and regulations. Damaged Pipes Inlet piping damaged or broken? YES NO Outlet piping damaged or broken? YES NO Repair or replace pipe. ---PAGE BREAK--- Operations/Maintenance BMPs Baffle Oil Water Separator -API Rev _ 12/30/2010 page 64 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Access Cover Damaged/Not Working Cover cannot be opened? YES NO Corrosion/deformation of cover? YES NO Repair cover to proper working specifications. Replace cover. Vault Structure Damage - Includes Cracks in Walls Bottom, Damage to Frame and/or Top Slab Top slab has holes > 2 in2? YES NO Cracks > 1/4 inch? YES NO Frame sitting flush on top slab? YES NO Frame securely attached? YES NO Structure is unsound? YES NO Replace or repair vault to designed specifications and is structurally sound. ---PAGE BREAK--- Operations/Maintenance BMPs Baffle Oil Water Separator -API Rev _ 12/30/2010 page 65 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Vault Structure Damage - Includes Cracks in Walls Bottom, Damage to Frame and/or Top Slab (cont.) Grout separated? YES NO Grout cracked > 1/2 inch and longer than 1 ft. at the joint of any inlet/outlet pipe? YES NO Evidence of soil particles entering catch basin through cracks? YES NO Repair vault so that no cracks exist wider than ¼ in. at the joint of the inlet/outlet pipe. Baffles Baffles corroding? YES NO Baffles cracking or warping? YES NO Baffles showing signs of failure? YES NO Repair or replace baffles to specifications. Access Ladder Damaged Ladder is corroded or deteriorated? YES NO Ladder functioning properly? YES NO Replace or repair ladder to meet specifications, and is safe to use. ---PAGE BREAK--- Operations/Maintenance BMPs Baffle Oil Water Separator -API Rev _ 12/30/2010 page 66 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Access Ladder Damaged (cont.) Ladder securely attached to structure wall? YES NO Missing rungs? YES NO Rungs cracked, or misaligned? YES NO Replace or repair ladder to meet specifications, and is safe to use. ---PAGE BREAK--- Operations/Maintenance BMPs Oil Water Separator - CP Rev _ 12/30/2010 page 67 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General Monitoring Discharge water shows signs of poor water quality? YES NO Perform maintenance. Sediment Accumulation Sediment depth in bottom of vault > 6 inches in depth and/or visible signs of sediment on plates? YES NO Remove sediment deposits on vault bottom and plate media, which would impede flow through the vault and reduce separation efficiency. Trash and Debris Accumulation Trash and debris in vault? YES NO Trash and debris in pipe inlet/outlet? YES NO Remove trash and debris from vault. Remove trash and debris from inlet/outlet pipe. Oil Accumulation Oil accumulation > 1 in. at the water surface? YES NO Oil is extracted from vault using vactoring methods. Coalescing plates are cleaned by thoroughly rinsing and flushing. Should be no visible oil depth on water. Damaged Coalescing Plates Plate media broken? YES NO Plate media deformed? YES NO Replace a portion of the media pack. Replace the entire plate pack depending on severity of failure. ---PAGE BREAK--- Operations/Maintenance BMPs Oil Water Separator - CP Rev _ 12/30/2010 page 68 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Damaged Coalescing Plates (cont.) Plate media cracked? YES NO Plate media showing signs of failure? YES NO Replace a portion of the media pack. Replace the entire plate pack depending on severity of failure. Damaged Pipes Inlet or outlet piping damaged or broken? YES NO Repair or replace pipe. Baffles Baffles corroding? YES NO Baffles cracking or warping? YES NO Baffles showing signs of failure? YES NO . Repair or replace baffles to meet specifications. Vault Structure Damage -Includes Cracks in Walls, Bottom, Damage to Frame and/or Top Slab Cracks > ½ in? YES NO Replace or repair vault to designed specifications and is structurally sound. ---PAGE BREAK--- Operations/Maintenance BMPs Oil Water Separator - CP Rev _ 12/30/2010 page 69 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Vault Structure Damage -Includes Cracks in Walls, Bottom, Damage to Frame and/or Top Slab (cont.) Evidence of soil particles entering the structure through the cracks? YES NO Vault is structurally sound? YES NO Replace or repair vault to designed specifications and is structurally sound. Cracks > ½ in. at the joint of any inlet/outlet pipe? YES NO Evidence of soil particles entering through the cracks? YES NO Repair vault so that no cracks exist wider than ¼ in. at the joint of the inlet/outlet pipe. Access Ladder Damaged Ladder is corroded or deteriorated? YES NO Ladder functioning properly? YES NO Ladder securely attached to structure wall? YES NO Repair or replace ladder to meet specifications and is safe to use. ---PAGE BREAK--- Operations/Maintenance BMPs Oil Water Separator - CP Rev _ 12/30/2010 page 70 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Access Ladder Damaged (cont.) Missing rungs? YES NO Rungs cracked, or misaligned? YES NO Repair or replace ladder to meet specifications and is safe to use. ---PAGE BREAK--- Operations/Maintenance BMPs Catch Basin Inserts Rev _ 12/30/2010 page 71 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General Sediment Accumulation Sediment forming a cap over the insert media of the insert and/or unit? YES NO Remove sediment cap on the insert media and its unit. Trash and Debris Accumulation Trash and debris on insert unit creating a blockage/restriction? YES NO Runoff flows easily into catch basin? Remove trash and debris from insert unit. Media Insert Not Removing Oil Effluent water from media insert has a visible sheen? YES NO Perform maintenance. Media Insert Water Saturated Catch basin insert is saturated with water? YES NO Catch basin insert no longer has the capacity to absorb? YES NO Remove and replace media insert ---PAGE BREAK--- Operations/Maintenance BMPs Catch Basin Inserts Rev _ 12/30/2010 page 72 F:\Yards\Storm Water\NPDES Road Map\Annual Reports\2011\Attachements\SD_OM_SOP_Checklist_rev3.doc Maintenance Component Defect Condition Actions General (cont.) Media Insert-Oil Saturated Media oil saturated due to petroleum spill that drains into catch basin? YES NO Remove and replace media insert. Media Insert Use Beyond Normal Product Life Media has been used beyond the typical average life of media insert product? YES NO Remove and replace media at regular intervals, depending on insert product.