Hydrodynamic separation devices - installation and maintenance recommendations Hydrodynamic separation devices - installation and maintenance recommendations

Hydrodynamic separation devices - installation and maintenance recommendations
Link to this table

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; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18