Asiana Flight 214:

Storm Drain and Soil

Remediation

Bay Pollution Prevention Program

Presenter: Jennifer Acton jennifer.acton@flysfo.com

Summary of Emergency Remediation Efforts

• Overview of Initial Contamination

• Evaluation of Storm Drain System

• Emergency Soil Remediation

• Storm Drain Remediation

• Post-Emergency Remediation Activities

• Lessons Learned

Overview of Initial Contamination

• July 6, 2013, Asiana Flight 214 made a crash landing

onto Runway 28L.

• The right wing of the aircraft, which was leaking jet fuel,

came to rest directly over a storm drain catch basin.

• Approximately 2950 gallons of jet fuel was spilled onto

the soil or into the storm drain system.

• Due to the resulting fire, AFFF firefighting foam entered

the storm drain system.

Right Wing & Adjacent Catch Basin

Left Wing and Adjacent Catch Basin

Evaluation of Storm Drain System

• Immediately following the crash, both storm drain pump stations

servicing the affected area (1A and 1B respectively) were taken

offline.

• Water samples were collected from pump stations 1A & 1B and

subsequently analyzed. 1B was determined to be free of

contamination, while both jet fuel and AFFF were detected in 1A.

• BPPP staff walked the crash site to evaluate which catch basins

and storm drain pipes had been affected.

Map of Affected Storm Drains

View of Aircraft from Station 1A

AFFF Foam in Wet Well

Emergency Soil Remediation

• Meeting conducted with RWQCB to propose the Emergency soil

remediation plan.

• Surveying the crash site and collection of (7) base samples

• After the aircraft had been transported offsite, (4) visually contaminated

areas were found. Contaminated soil was removed.

• Contamination was confirmed by the analysis of soil samples collected by

contracted geologist.

• All contaminated soil and asphalt were placed in 20 yard bins, and were

subsequently sampled and transported to an accredited landfill.

Map of Base Samples

Map of Contaminated Samples

Figure from Site investigation report prepared by Burns & McDonnell Engineering Company

Storm Drain Remediation

• Immediately following the crash, pump stations 1A and 1B were both

taken offline.

• Removal of the contaminated water from pump station 1A wet well so

flushing of the storm drainage lines could take place.

• Constant pumping out of affected wet well from any excessive tidal

infiltration to prevent flooding.

• Cleaning and flushing affected storm drainage lines near Asiana 214 final

resting point. (Approximately 3,200 feet of pipe)

• Testing water in storm drainage system and wet well.

Removal of Water from Pump Station 1A

Boring Hole into Drainage Pipe

Pumping Water Out of Drainage Pipe

Triple Flushing of Drainage Pipe

Steel Plate for Bore Hole

Cleaning of Pump Station 1A

Cleaning of Pump Station 1A

Post-Emergency Remediation Activities

• After triple flushing the storm drain pipe that runs under Runway

28L, samples were collected to ensure all contaminants had been

removed. Analysis of these samples confirmed that the line was

indeed clean.

• After triple flushing affected pump station, A 96h Acute Fish

Bioassay Screen was performed using tidal infiltration collected

from the station’s wet well.

• The 96h static renewal, 1x24hr passed the effluent toxicity test with

a 100% survival rate.

Post-Emergency Remediation

Activities

• The analytical data was submitted to the Regional Water Board.

After the RWQCB approval, pump station 1A was placed back

online.

• As a precautionary measure, booms were placed in the pump

station and around the outfall.

• All contaminated water, sand and soil were transported to

approved disposal facilities.

Lessons Learned

• 24/7 Spill Notification Individual

• Emergency Contracting Procedures in Place

• Be Prepared for the Unexpected

Long Term Soil & Groundwater

Remediation

Presenter: Emily Sing

Associate Engineer | Environmental Services and

Sustainability

Moving On

Develop Site

Investigation Report

Estimate volume of Contaminated soil and ground water

* All activities were conducted by Asiana, approved by the Regional Board and SFO

Develop Workplan Identify extent of contamination

Figure from Site investigation report prepared by Burns & McDonnell Engineering Company

• 50 boreholes • 10 feet deep • Analyzed for soil contamination in 3 ft. intervals • Analyzed for groundwater contamination

Figure from Site investigation report prepared by Burns & McDonnell Engineering Company

Estimated Remaining Contamination

Medium Estimated Quantity

Groundwater, Gallons 81,000

Soil, Tons 2,839

Estimated Quantities under review

Moving On

Develop Workplan

Develop Site

Investigation Report

Identify extent of contamination

Estimate volume of Contaminated soil and ground water

Develop

Remediation Plan

• Identify clean up standards and schedule for clean up

Questions?