(Click thumbnail to view entire map) Drainages off the Santa Susana Field Laboratory in eastern Ventura County. Map shows SSFL drainages and locations of National Pollutant Discharge Elimination System outfalls off of the lab 2,236 acres of lab drain to the LA River and 633 acres drain to Arroyo Simi. Drainages and surface water divides of lab shown with "perched and continuous near-surface groundwater" locations. Site layout of SSFL with "leach fields." Santa Susana Field Laboratory layout. TCE concentrations throughout SSFL. Locations of trichloroethylene (TCE) groundwater plumes and NPDES outfalls. Earthquake faults in Area IV of SSFL. Los Angeles River and its 834-square-mile watershed.