11
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Closure Activities At Santa Susana
2
Demolition
Surface Water Management Groundwater Cleanup
Soil Cleanup
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Surface Water Outfall Locations
3
001 002
005 006 007
003
004
Black Canyon
Woolsey Canyon
N Undeveloped Land
008
009 010
018
012
013
014
011
019
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Definitions
4
Best Management Practice (BMP) Structures, materials and processes used to
improve stormwater quality.
Outfall A location where samples are collected.
Watershed The area of land where all of the water that
drains off of it goes into the same place.
Composite Sampler Mechanism that allows for a sample to be collected that is representative of the rain
event.
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Surface Water Program at Santa Susana
5
Permit Limits vs EPA Drinking Water StandardTotal Quantity of Constituents Analyzed: 50
30%
6%
24%
40%
Permit Limits BelowEPA Drinking WaterStandard
Permit Limits AboveEPA Drinking WaterStandard
Permit Limits Equal toEPA Drinking WaterStandard
Permit Limits with NOEPA Drinking WaterStandards
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Best Management Practices How Boeing meets permit limits
6
Interim Source Removal Actions (ISRA)
Advanced chemical & physical treatment systems
Physical flow through multimedia filters
Engineered natural treatment approaches
Simple practices such as housekeeping, silt fences, and
straw wattles
Vegetation for soil stabilization
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7
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8
Watershed Approach: Large acreage watershed with holding capacity from ponds Answer: Two large advanced water treatment systems
539 Acres
291 Acres
306 Acres
361 Acres
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Active Treatment Systems Two major systems in use for discharges going to Bell Canyon
9
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Watershed Approach: Small acreage with limited holding Answer: Hold in tanks, then pump to the large treatment system.
Back-up Flow Through Systems 39 Acres
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11
Watershed Approach: Large acreage with no holding capacity. Answer: Distributed engineered natural treatment system.
536 Acres
62 Acres
