Remediation roundup

The Laboratory currently has six treatment systems on and off site operating 24 hours a day to clean up groundwater. The following is an update of groundwater treated and amount of contaminants removed.

Operable Unit I South Boundary Pump-and-Treat System - formerly RA V (operating since 12/96):

• 900,000,000 gallons of groundwater treated by air stripper and recharged
• 180 pounds of VOCs removed

Operable Unit III Pump-and-Treat System (operating since 6/97):

• 750,000,000 gallons of groundwater treated by air stripper and recharged
• 1012 pounds of VOCs removed

Tritium Remediation System (operating since 5/97)

• 116,000,000 gallons of water treated by carbon filters (to remove VOCs) and recharged
• 53 pounds of VOCs removed

Operable Unit IV Air Sparging/Soil Vapor Extraction System (operating since 11/97)

• 24 pounds of VOCs removed by carbon filters

Operable Unit III Off-site In-Well Air Stripping System (operating since 9/99)

• figures not yet available

Carbon Tetrachloride Groundwater Removal Action System (operating since 10/99)

• figures not yet available

To date, more than 1.7 billion gallons of groundwater have been treated, and more than 1,200 pounds of contaminants have been removed from the sole source aquifer.

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