Directed closure of ASTs at major aluminum recycling and manufacturing operation, according to RCRA and other hazardous wastes regulations. Permitted adjacent soils as RCRA landfill closure.

Performed additional RFI, including collection and analyses of soil and ground water samples, and installed vapor monitoring wells. RFI included treatability study for potential bioremediation corrective action. Performed engineering calculations for concrete cover and certified documents for RCRA closure of the SWMU associated with the earlier AST closure.

Performed on-site pilot tests, using vapor wells, and designed a system for remediation of the soils affected by the solvent spill. The design specified in-situ bioremediation using forced-air bioventing technology. Prepared required underground injection control (UIC) permit. Directed construction of system.

Performed aquifer tests by rapidly purging monitoring wells and timing recovery. Performed 72-hour in-situ respiration tests of subsurface microbial metabolic rates feeding on solvents affecting landfill soils, approximately every six months, to evaluate system performance over time.

Mobilized to site on periodic basis to inspect and adjust system operations and test subsurface extent of aeration. Used weekly fax updates of system gage and meteorological readings collected by Bonnell technicians to remotely monitor proper system operations. Used aquifer hydraulics, microbial respiration and system operations data to develop one-dimensional model of contaminant transport, leaching and remediation effectiveness and predict time remaining to closure. Completed risk assessment with termination of system operations pending regulatory approval.

Developed RCRA Contingency Plan for compliance with Part B, Treatment, Storage and Disposal Permit. This required top-to-bottom assessment of all plant manufacturing operations, hazardous materials use and storage, and safety procedures.