The document summarizes a brownfield redevelopment project that received LEED Silver certification. Green remediation principles were applied to lower the carbon footprint and environmental impact of cleaning up contamination from historical industrial usage. In-situ stabilization was used to remediate arsenic and reduce greenhouse gas emissions compared to other remedial alternatives. Additional sustainable measures included reuse of demolition materials, permeable reactive barriers, and vapor control systems.

1. Green Remediation Efforts as Part of LEED Silver Brownfield Development Project David Winslow and Angela Altieri GZA GeoEnvironmental Inc.

8. Why Green Remediation Reference High Price Low Price Projections History 2005 dollars per barrel

22. Eh > 100 mV pH < 5.5 Eh < 0 mV pH > 8.0

25. Dissolved As > 1,000 ppb Zone 2 Zone 1 Dissolved As > 1,000 ppb

28. Arsenic in Unsaturated Soil

29. Arsenic in Saturated Soil

30. Arsenic > 1,000 ppb in groundwater Arsenic > 600 ppm in soil

34. Option A Option D Option B Option C Transportation Air releases Treatment Water use Off-site transfers Greenhouse gases Energy consumed Soil/Solid material Water use Land use volume matrix material depth mobility contaminants 2 Remedial Options 3 Calculation Modules 4 Sustainability Factors 1 Project Data Option E Conceptual Framework for Sustainability Analysis

35. Step 3 – Identify Components ISS + MNA Task Item Quantities Mobilization and Site Prep Time Staff Equipment 10 days 11 - 1 Super, 1 Eng’r, 9 Operators & Laborers Man lift, forklifts (2), crane, mix head, others Crane and Mix Head Assembly Time 5 day Soil Mixing Time Staff Equipment Materials 14 days 11 - 1 Super, 1 Eng’r, 9 Operators & Laborers Mix head/crane, fork lifts, excavator 1200 tons Cement, 240 tons ferric sulfate 130,000 gal water Demob, including grading Time Staff Equipment 4 days 11 - 1 Super, 1 Eng’r, 9 Operators & Laborers Excavator, man lift, forklifts (2), crane, mix head

38. Total CO2 Tons T&D = 1989 Total CO2 Tons ISS = 537 Activity Excavation, Transportation and Disposal In-situ ISS and T&D Arsenic Pitch T&D 1339 Tons - Arsenic T&D 161 Tons 161 Earthwork 166 Tons 166 Import Fill 157 Tons 62 Place Fill 166 Tons 66 Import Concrete - 82