Surface Water

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.

Storm water runoff from the Sodium Reactor Experiment (SRE) is monitored at Outfall 004. This water flows towards the Arroyo Simi. Stormwater flows at Outfall 004 are estimated to be 0.19 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.

Storm water runoff from the upper Former Sodium Disposal Facility (FSDF -1) is monitored at Outfall 005. This water flows towards the Arroyo Simi. Stormwater flows at Outfall 005 is estimated to be 0.0007 million gallons per day for a 1 year, 24 hour storm event.

An advanced pump and treat system is in place at this location in which storm water is collected in a retention basin and pumped through a two stage system using sand and activated carbon filters. The treated storm water is then returned to the drainage channel for release.

Storm water runoff from the lower Former Sodium Disposal Facility (FSDF-2) is monitored at Outfall 006. This water flows towards the Arroyo Simi. Storm water flows at Outfall 006 are estimated to be 0.207 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 from this watershed. This includes a gravity fed three stage filter composed of sand, granular activated carbon (GAC), and zeolite.

Storm water runoff from the Building 100 is monitored at Outfall 007. This water flows toward the Arroyo Simi. Storm water flows are estimated to be 0.05 million gallons per day for a 1 year, 24 hour storm event.

An advanced pump and treat system is in place at this location in which storm water is collected in a retention basin and pumped through a two stage system using sand and activated carbon filters. The treated storm water is then returned to the drainage channel for release.

Storm water runoff from Happy Valley is monitored at Outfall 008. This drainage discharges towards Dayton Canyon. Storm water flows at Outfall 008 is estimated to be 0.72 million gallons per day for a 1 year, 24 hour storm event.

Plans are currently underway for the installation of an engineered natural treatment (ENT) system for this water shed. More information on this ENT project may be found on this website.

Storm water runoff from the along the Northern Drainage is monitored at Outfall 009. Water from this location discharges towards the Arroyo Simi. Storm water flows from this outfall are estimated to be at 6.7 million gallons per day for a 1 year, 24 hour storm event.

Plans are currently underway for the installation of an engineered natural treatment (ENT) system for this water shed. More information on this ENT project may be found on this website.

Storm water runoff from the Building 203 is monitored at Outfall 010. Water at this location discharges towards the Arroyo Simi. Storm water flows at Outfall 010 are estimated to be 0.12 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 from this watershed. This includes a gravity fed three stage filter composed of sand, granular activated carbon (GAC), and zeolite.

Outfall 11 is the exit point of Perimeter Pond, one of the four major unlined ponds systems at the Santa Susana Field Laboratory. This location collects water from the eastern portion of the site and discharges into the southern undeveloped portion of the site where it flows through outfall 001 and then released offsite to Bell Canyon. Storm water flows from this outfall is estimated to be 3.7 million gallons per day for a 1 year, 24 hour storm event.

There are numerous upstream activities underway from this outfall to reduce sediment migration and improve water quality. These activities include:

• Hydromulching
• Covering of equipment
• Cleaning of culverts
• Placement of straw wattles and silt fences.

In addition there is a gravity fed flow through filtration unit at the discharge point. Current plans are also underway to install a system to pump and treat the pond water to further ensure water quality requirements are met.

Monitoring is conducted for storm water at this inactive test stand. A water sampling point was established to collect water for analysis. Measures were also put in place to improve water quality including the installation of sandbag barrier with drain pipe that routes storm water into a series of carbon and zeolite filter bags that clean the storm water prior to release into the drainage upstream from outfall 018.

Monitoring is conducted for storm water at this inactive test stand. A water sampling point was established to collect water for analysis. Measures were also put in place to improve water quality including the installation of sandbag barrier with drain pipe that routes storm water into a series of carbon and zeolite filter bags that clean the storm water prior to release into the drainage upstream from outfall 018.

Monitoring is conducted for storm water at this inactive test stand. A water sampling point was established to collect water for analysis. Measures were also put in place to improve water quality including the installation of sandbag barrier with drain pipe that routes storm water into a series of carbon and zeolite filter bags that clean the storm water prior to release into the drainage upstream from Outfall 011.

Outfall 018 receives storm water form the western portion of Santa Susana Field Laboratory including any flow leaving the Silvernale pond. This outfall is located at the exit point of the R-2 pond. The estimated discharge from this Outfall is 5.9 million gallons per day for a 1 year, 24 hour storm event. There are several practices in place upstream from this location to improve water quality and reduce sediment loading.

Theses practices include:

• Hydromulching
• Covering of equipment
• Cleaning of culverts
• Placement of straw wattles and silt fences.

At the exit point of this pond is an advanced structural flow through treatment system consisting of eight parallel filter cells. Each filter cell is filled with sand, activated carbon and zeolite. Additionally, plans are underway to install at pre-filter to prevent clogging of the filter beds. This treated storm water is discharge to the southern undeveloped portion of the site where it is again sampled at outfall 2 and released to Bell Canyon.

Boeing is currently in the process of constructing a new groundwater extraction treatment system (GETS) that will treat the groundwater pumped from Santa Susana Field Laboratory. The treated groundwater will be monitored and mixed with any treated storm water that may be flowing from Outfall 11.

The groundwater currently pumped from this site is collected and hauled off-site for disposal until this system comes on line.