In Situ Thermal Desorption Combined with Steam Enhanced Extraction Confidential Facility, Los Angeles, California SCALE IN FEET 0 25 SCALE IN FEET 25 LEGEND SP - SW SM - SC ML - CL Well Casing Well Screen Interval Target Treatment Zone Groundwater Elevation Measured In Feet MSL- September 2006 AST - Above-ground Storage Tank ND - Not Detected NM - Not Measured TD - Total Depth A' NORTHEAST A SOUTHWEST ELEVATION (FEET ABOVE MEAN SEA LEVEL) 0 10

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