1. Green Remediation through Optimization Douglas Sutton, PhD, PE Tetra Tech GEO April 4, 2011

2. Brownfields 2011 Philadelphia Convention Center April 3-5, 2011 Best Management Practices for Green Remediation Footprint Reduction Optimization Fundamentals Optimization ComprehensiveIndependentExpertise Integrate data Tools and technology SustainabilityConstructive

3. Brownfields 2011 Philadelphia Convention Center April 3-5, 2011 Best Management Practices for Green Remediation Footprint Reduction Green Remediation Core Elements

4. Brownfields 2011 Philadelphia Convention Center April 3-5, 2011 Best Management Practices for Green Remediation Footprint Reduction Examples of Optimization - Part 1 Focus of OptimizationExample Outcome Green Core Element Components of remedy and alternative components that can provide the same function Component: Water for blending and injecting chemicals for injection. Optimization: Use extracted groundwater instead of potable water Water Relevance and appropriateness of remedy components based on existing conditions Component: Blower Optimization: Decrease SVE blower size now that some extraction points have been eliminated Energy & Air Procedures associated with implementing remedy Procedure: Soil management Optimization: Segregate clean soil from impacted soil during excavation to reduce amount of soil requiring treatment or disposal Waste +

5. Brownfields 2011 Philadelphia Convention Center April 3-5, 2011 Best Management Practices for Green Remediation Footprint Reduction Examples of Optimization - Part 2 Focus of OptimizationExample Outcomes Green Core Element Data gaps, potential improvements, or corrections to site conceptual model Improve delineation/characterization prior to remediation to reduce target area for cleanup and ensure entire source is removed Use in-situ bioremediation in place of chemical oxidation due to strong soil oxidant demand Use borrow from stream bank for soil cover and simultaneously widen/flatten stream bank to reduce erosion and expand extent of riparian wetlands All Materials + Land & Eco +

6. Brownfields 2011 Philadelphia Convention Center April 3-5, 2011 Best Management Practices for Green Remediation Footprint Reduction Examples of Optimization - Part 3 Focus of OptimizationExample Outcomes Green Core Element Appropriateness of performance monitoring Decrease frequency of groundwater sampling and reduce number of analytes given that historical database has been established Use groundwater modeling in conjunction with water levels and groundwater sampling to confirm plume capture Sample for MNA parameters now that source has been removed All

7. Brownfields 2011 Philadelphia Convention Center April 3-5, 2011 Best Management Practices for Green Remediation Footprint Reduction Quantify Footprints of Alternatives to Document Green Remediation Benefits Original P&T remedy using air stripping with GAC polishing and discharge to POTW to treat 1,2- DCA and other VOCs Various alternatives to original remedial system 1.Enhance air stripping and eliminate GAC polishing 2.Enhance air stripping and eliminate GAC polishing and discharge to POTW 3.Same as item 2 but also use renewable energy to power pumps and air stripper blower

8. Brownfields 2011 Philadelphia Convention Center April 3-5, 2011 Best Management Practices for Green Remediation Footprint Reduction It’s a Two-Way Street Optimization Green Remediation Reduction of the P&T carbon footprint could have resulted from optimization, but… It also could have resulted from a green remediation evaluation focused on reducing carbon footprint

9. Brownfields 2011 Philadelphia Convention Center April 3-5, 2011 Best Management Practices for Green Remediation Footprint Reduction Take Home Points Remedy optimization results in reducing environmental footprints by… –Modifying aspects of existing remedy –Improving conceptual site model and modifying remedial strategy –Improving/streamlining performance monitoring Successful optimization requires characterization/remediation expertise and experience… Substantial green remediation benefits also require the same expertise Environmental footprint quantification and analysis helps document green remediation benefits Green remediation involves looking at remedy from a different perspective, which can lead to additional optimization opportunities