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STEVEN M. STANFORD, LPG Senior Project Manager system. He is versed in the evaluation of advection, dispersion, and diffusive contaminant migration mechanisms and is familiar with the most recent research on diffusion transport through clay and high density polyethylene. Based largely on the Johnson & Ettinger vapor intrusion model as published by EPA in 2003, Mr. Stanford completed a quantitative baseline risk assessment supporting the completion of RCRA corrective action for organic solvents released to soil and groundwater beneath an historical manufacturing facility. His work included quantification of risks resulting from ingestion, inhalation, and dermal contact with soil and groundwater consistent with Risk Assessment Guidance for Superfand (RAGS) Parts A, B, and E. To close an Indiana Voluntary Remediation Program site, Mr. Stanford prepared a baseline human health risk assessments in accordance with RAGS and ASTM Risk Based Corrective Action technical protocols. His resulting risk assessment allowed successful completion of the remediation based on one of the highest site- specific closure levels approved in Indiana for benzene. Mr. Stanford has assessed numerous contaminated sites in accordance with ASTM and state - specific risk -based corrective action protocols. This work has included the development of Tier IT and Tier Ill remediation objectives in accordance with Illinois' TACO program and Indiana's RISC non -rule policy. These efforts have included digital and analytical modeling of a variety of exposure pathways including volatilization of VOCs to ambient and indoor air, ingestion, inhalation, and dermal absorption. Mr. Stanford completed and subsequently obtained approval from IEPA for a supplemental permit application specifying a groundwater quality assessment at a closed illinnis Part 307 facility, The assessment plan incorporated electromagnetic conductivity geophysical methods to aid in the selection of monitoring well locations. On behalf of a North American railroad company, Mr. Stanford investigated a 96 -acre rail yard located in Bensenville, Illinois, He enrolled the facility into Illinois' Site Remediation Program and his Site investigationMemedial Objectives Report was 2 approved. As a consequence, no remediation was found to be necessary for approximately 90 acres of the yard, despite the presence of numerous recognized environmental conditions. On the balance of the site, he installed a vacuum- skimming remediation system that is currently extracting diesel fuel free product from a shallow aquifer. Mr. Stanford reviewed the proceedings of s Region 5 Superfund Site contaminated by four principal PRPs to develop an equitable allocation of response costs among the PRPs. Boiling point distributions and statistical analyses of site contaminant data were used to identify the contributions of one recalcitrant PRP. His resulting method of allocation utili7.cd the concepts of causality and the stand -atone method of common cost allocation. MT. Stanford Investigated and prepared a closure plan for a solvent- recovery TSD facility that was part of a larger NPL site. His closure plan addressed storage (tank) and treatment (vacunin stills) units. He secured IO &M approval, taking advantage of the facility's NPL status to successfully defer subsurface remediation, and implemented closure through successful final certification. Mr. Stanford investigated and prepared plans for a multi -year' TSWSuperfund site closure located in EPA Region 7. He was responsible for all sampling and geological/ hydrogeological characterization of the site and a coauthor of closure documents describing an P.xpedited Response Action whereby the site was re- graded, capped, and finally covered with a new abutment for a U.S. Highway extended over both the site and the Mississippi River. Mr. Stanford designed, specified, procured equipment, and installed an air sparginglsoil vapor extraction remediation systems for the town of Chesterton, Indiana. This project included 40 air injection wells, four soil vapor extraction wells, process control design and installation, operations, and maintenance. He directed, supervised, and completed all consiraction activities. After three years of operation, 1,600 pounds of gasoline were recovered as vapor and groundwater BTEX concentrations were either eliminated or reduced by over 95 percent in all monitoring wells.