1. Determination of biodegradation components.

2. Determination of air flow pathways.

3. Long-term removal rates.

1a.  Soil gas and respiration testing.

2a.  Series of multiple configuration extraction tests (1 event)

2b. If influence cannot be determined, install VEWs to investigate non-influence areas (air emissions standard exemption must be modified in this case).

3a. Collect emissions data weekly for one month.

1. Determine trench limits and maximum extent of affected soils.

2. Determine new removal rates.

3. Determination of biodegradation components.

4. Determination of air flow pathways.

1a.  Install additional soil borings based on multiple configuration testing.

1b. Collect samples and install VEW in affected soils.

1c.  Design and manifold new VEWs to existing system, modify standard air exemption.

2a.  Emissions testing weekly for one month.

2b.  If significant reduction in removal rates is observed, then evaluate pulsing to optimize VOC removal.

3.  Soil gas and respiration testing.

4a.  Series of multiple configuration extraction tests (1 event).

1. Determine metals concentrations and volume of affected soils in trenches.

2. Determine design parameters for treatment options.

1a.  Perform systematic random sampling to identify "hot spots" in test soil samples for metals.

2a.  Determine physical parameters.