Site Cleanup

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Site Cleanup Options

• KCDT Metro Facilities North Site 1602 N Northlake
  Place, Seattle
• Former Chevron Bulk Fueling Terminal 100-1327

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Model Toxics Control ActCleanup
RegulationsChapter 173-340 WAC

• Washington State
• Process for Cleanup of
• Contaminated Sites

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Site Cleanup Players

• Ecology Maura S. OBrien, PG/HG
• Ben Amoah-Forson, PE
• Rebekah Padgett, PIO
• KCDT Metro Transit Div Judy Riley
• Sheldon Teel, PE
• J Paul Miller, PE
• Chevron Texaco Gerald ORegan
• SAIC Timothy Warner
• Russell Shropshire, PE
• CDM Mark Adams, PG
• Others

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Focus

• Site Cleanup Status
• Options
• Schedule for Options

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Site Cleanup

• Task 1 Tank Farm Demolition
• Shallow Soils Metals Removal
• completed 99
• Task 2 Cleanup Deeper Soils
• Groundwater - 99-present
• Task 3 Compliance Monitoring -On-going

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Task 2 Cleanup Deeper Soils Goundwater

• Three methods used in Task 2
• HP Injection -99-01
• Enhanced Fluid Recovery -01
• Biosurging -02-03
• Results monitoring -present
• -Other methods???

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Options

• Restrictive Covenant placed on
• property deed
• Capping and Restrictive Covenant
• Excavation
• Other ???

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Options with Compliance Monitoring

• Restrictive Covenant requires
• long-term monitoring
• Capping requires RC long-term monitoring
• Excavation CM ---Finished

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Compliance Monitoring

• Task 2 Cleanup
• Excavation soil removed, then
• one sampling event
• Groundwater -
• Four Quarters below cleanup levels, possibly
  periodic monitoring each 5 yrs
• Source removal then periodic monitoring may not
  be required

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Schedule for Options

• RC anytime, then 5 yr monitoring
• Capping RC then 5 yr monitoring
• Excavation few months, then compliance
  monitoring
• Soils once
• Groundwater four quarters below cleanup level
  1 to 2 years
• Notice of Completion

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Questions.