Hydrodynamic separation devices - installation and maintenance recommendations
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Device Installation notes Frequency of inspections Maintenance checklist (link) Permitted on private land/ Maintenance agreement recommended Practices for minimizing sediment buildup Removal of trash and debris Cost considerations (equipment needed and man hours)
Vortechs TM by Contech Site specific considerations and contractor notes available here1, 2 Once a month or after each heavy contaminant load for the first year, then twice per year Inspection and maintenance log Remove sediment with vacuum truck when buildup reaches within 18 inches of inlet pipe2 Remove oil immediately after spill, absorbent pads may be used. Removal of most other floating material possible through same access point as sediment, but also may require skimming of baffle chamber2 Vacuum truck or “clamshell” grab, absorbent pads2
Continuous Deflective Separation (CDS) R by Contech Site specific considerations and contractor notes available here After every runoff event for the first 30 days, then once every 30 days during wet season, screen inspection at least once per year3 Inspection and maintenance log Sump pumped out when level of sediment reaches 75% of sump height. Also clean area outside screen.4 Remove oil immediately after spill, absorbent pads may be used.4 Vacuum truck and/or absorbent material5
Downstream Defender TM H.I.L. Technology Handling and installation instructions available here Once a month during first year of operation to determine rate of accumulation, then every 6 months6 Inspection and maintenance log Removal once per year, or as needed (when sediment depth is greater than 75% of maximum cleanout depth) or following a spill in the drainage area7 During sediment clean out or immediately following spill7 Vactor truck: Manual skimming8
First Defense R by Hydro International Handling and installation instructions available here Regularly for first year, then every 6 months9 Inspection and maintenance log Sediment removal with vactor hose once per year, or as needed, or following a spill in the drainage area9 Oil and floatables removal with vactor hose once per year with sediment removal or following a spill in the drainage area9 Vactor truck: Manual skimming10
Stormceptor R by Imbrium or Rinker Materials Installation instructions available here11 Routinely for first year and after a spill, visual inspections (with dipstick) especially recommended for units that may capture petroleum-based pollutants Inspection and maintenance instructions Remove sediment with vacuum truck when unit is filled 15% of total storage capacity or at least once per year11, 12 During sediment clean out or immediately following spill Vacuum truck; Standard visit costs approximately $1000 per structure13
Barracuda by BaySaver Installation guides available here Bimonthly inspection for the first year, then annually14 Removal of sediment with vacuum truck when depth has exceeded 10 inches (typically every 12-18 months)14 Vacuum truck14
Dual Vortex Separator by OldCastle Installation instructions available here Conducted at least twice per year, but more frequently the first 2-3 years and during winter15 Maintenance manual Obtain proper traffic diversion if necessary15 Removal of sediment when depth exceeds 12 inches15 Replace sorbent pads when dirty or saturated, vacuum truck required to remove floating trash and debris cannot be retrieved with net or oil is significant16 Vacuum truck, tethered sorbent pads if applicable16
SciClone TM by BioClean Same procedure as standard manhole installation17 Multiple times during first year to assess site-specific conditions, use this to establish inspection schedule18 Maintenance manual and inspection form Removal of sediment when depth exceeds 18 inches18 Removal of trash and floatables when length and width of skimmer is fully impacted (extending down 9 inches)18 Vacuum truck

Reference links: 1; 2; 3; 4; 5; 6; 7; 103 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18

This page was last edited on 13 April 2020, at 17:57.

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