1. Deducing the distribution of terminal electron-accepting processes (TEAPs) in hydrologically diverse groundwater systems Chappelle et al. (1995) Water Resources Research, Vol 31, No. 2

2. Introduction The Importance The Problem The Alternative

3. I TEAPs It Real The Basics Water chem can determine TEAPs by 1.Tracking electron acceptor consumption 2.Tracking final product accumulation 3.Tracking intermediate product concentrations Previous studies fail to TEAPs it real Hydrogen (H 2 ) concentrations an important intermediate product indicator of TEAPs

4. PURPOSE OF THE PAPER

5. Hierarchical Framework for Identifying TEAPs

6. STUDY SITES

7. Black Creek Aquifer, South Carolina

9. Floridan Aquifer - Baldosta, Georgia

11. Alluvial-Lacustrine Aquifers – San Joaquin Valley

12. Alluvial-Lacustrine Aquifers San Joaquin Valley

13. Petroleum Hydrocarbon-Contaminated Aquifer: Hanahan, South Carolina

15. CONCLUSIONS The main, important observation is that H 2 concentration ranges for different TEAPs are consistent between the diverse hydrologic systems studied H 2 Concentrations are a useful indicator for TEAPs and increase confidence when used in conjunction with electron acceptor consumption and final product production.