VOC Mass Estimate

The total VOC mass at the Site is estimated to be 546,700kg and is thought to be distributed approximately as follows (BBL and USEPA 2005):

• Unsaturated Soil: 2,200kg sorbed and dissolved, and 1,300kg as NAPL; for a total of 3,500kg, or 0.64% of the estimated total VOC mass
• Overburden NAPL Area: 460,000kg as NAPL, or 84% of the estimated total VOC mass
• Overburden Groundwater: 1,900kg dissolved, 9,300kg sorbed; for a total of 11,200kg, or 2.1% of the estimated total VOC mass
• Bedrock: 39,000kg dissolved and sorbed (combined), 33,000kg NAPL, or 7.1% and 6.0% of the estimated total VOC mass, respectively

In summary, the majority of the VOC mass is in the form of NAPL in the Overburden NAPL Area.