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Santa Susana

Surface Water

Monitoring Locations

Outfall 003 RMHF

Outfall 3

Storm water runoff from the watershed around the Radioactive Materials Handling Facility (RMHF) is monitored at Outfall 003. This water flows towards the Arroyo Simi watershed. Stormwater flows at Outfall 003 are estimated to be .17 million gallons per day for a 1 year, 24 hour storm event.

Extensive structural controls are in place to manage sediment run-off and improve water quality from this watershed. This includes a gravity fed three stage filter composed of sand, granular activated carbon (GAC), and zeolite. In addition to this filtering system there is an upstream basin designed to retain a 1 year storm. This structure has a screened collection and outlet pipe, and is designed to discharge stormwater at a flow rate within the filtration capacity of the three stage filter.