1. Soil Remediation HS-Chem/SmileCorp Collaboration

2. SmileCorp Smelting Facility located in Smileyville, NY zinc, tin and lead production recycling/recovery of metals large employer in area supply metals to many industries

3. Our Facility In use for 50 years 50 acre site On Smileyville river –recreational Near residential areas Near forested areas

4. Smelting Byproducts Blast furnace slag –considered harmless –used in other products –off site disposal Blast furnace stack –dust containing lead –Stored on site recycling disposal

5. Past Practices Blast furnace slag –may have been dumped in Smileyville river –dispersed around site –left in piles on site Blast furnace stack –dust may not have been captured –captured dust may be disposed of on site

6. Subsurface Ground water Depth to water table = 5 feet Direction of flow Depth of known lead contamination = 4.5 feet Bedrock Depth = 10 feet

7. SmileCorp Options Do nothing Pump and treat Pump and treat with additive (EDTA) Ground water H 2 0 + EDTA? H 2 0 + Pb +2 Bedrock

8. Lead - ligand Interaction EDTA Pb +2 Soil Pb +2 Released into solution In solution “tied up” by ligand (ethylenediaminetetraacetic acid)

9. SmileCorp Objectives Cost effective solution Least chance of fines from government or lawsuits Non-disruptive procedure

10. HS-Chem Analyze data & run experiments –what will happen to lead on our site if left as is? –should we consider pump and treat technology? –would adding EDTA to the pump and treat system improve results? –what is the best course of action for SmileCorp?