Modeling Fort Ord Site OU2's Remediation System Using Optimizationby Omar Beckford,
Amy B. Chan-Hilton,
Abstract: Fort Ord.s Site OU2 is located approximately 80 miles south of San Francisco near Monterey Bay in Monterey County, California. Fort Ord contains two landfills which were used for residential and commercial waste disposal. Fort Ord was placed on the EPA.s National Priorities List (NPL) mainly due to the volatile organic compounds (VOCs) found in groundwater under the site. Fort Ord Site OU2 is currently using pumpand- treat remediation with granular activated carbon (GAC) (Lieberman, 2004). The system has been in operation since 1995. OU2 consists of three areas: (1) a shallow soil and waste material unit within the landfill areas, (2) the A-aquifer, and (3) the 180-foot aquifer below the A-aquifer. In the first layer, the soil samples collected below the landfill did not contain waste connected to the landfill. However, landfill contaminants have been found in the form of soil vapor from soil overlying the landfills and in groundwater underneath the landfills. It is thought that the chemicals have traveled away from the landfill materials as vapors or as solutes in the leachate. Chemicals are present in the groundwater in both the A-aquifer and the 180-foot aquifer. Groundwater in the A-aquifer is about 50 to 100 feet below ground surface (bgs). Groundwater in the 180-foot aquifer occurs between 100 to 300 feet bgs. Data from the remedial investigation show that the largest number of chemicals and maximum concentrations were found in the A-aquifer.
Subject Headings: Landfills | Optimization models | Remediation | Groundwater | Aquifers | Domestic wastes | Volatile organic compounds | North America | California | United States
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