Groundwater 101

1. Groundwater 101 Eric T. Beller, P.G., Work Leader MSW Permits Section TCEQ

2. Introduction • Background Sampling • Detection Monitoring • Assessment Monitoring • Corrective Action • Reporting – All Types

3. Introduction Continued • Reporting • Notice of a Statistically Significant Increase • Resampling reports • Alternate Source Demonstrations (ASD)s • Annual Report • CDs – Electronic Data

4. Background Sampling • Rules allow collection of 4 samples but 8 are preferred • Parametric and Non-Parametric Prediction Limits • Initial decisions based on background data set • Background updates every two years

5. Background

6. Background

7. Background • Parametric vs. Non-Parametric • Interwell vs. Intrawell Comparisons

8. Detection Monitoring • Metals vs. Volatile Organic Compounds (VOC) • Naturally Occurring vs. Man Made • Statistically Significant Increase (SSI) over a background prediction limit for metals • Quantifiable Detection of a VOC

9. Verification Resampling Background Prediction Limit Initial SSI Result • 2.5%

10. Verification Resampling Prediction Limit Background Resample Result Initial SSI Result Contamination • • 2.5%

11. Assessment Monitoring • Sample Appendix II constituents in “affected well and in the two adjacent wells” • Appendix II sampled annually • ED may approve after initial Appendix II sampling: • Alternative Appendix II list for assessment monitoring • Alternative frequency for repeat full Appendix II assessment

12. Assessment Monitoring • Are the sampled concentrations statistically significant over a groundwater protection standard? • Appendix II • Are there other constituents of concern?

13. Assessment Monitoring

14. Corrective Action • Assessment of Corrective Measures • Selection of Remedy • Implementation of a Corrective Action Program • Continue Assessment Monitoring

15. Corrective Action • Install or Improve Landfill Gas Collection Systems • Barriers • Slurry walls • Gas cutoff trenches • Injection • Pump and Treat

16. Corrective Action

17. Laboratory Accreditation • July 1, 2008 - all analyses must be conducted by a laboratory accredited under the Texas Laboratory Accreditation Program • Expired Chapter 330, Subchapter F • Practical Quantitation Limit Study • Analysis Precision and Accuracy

18. Background Evaluation Report • All background sample results • Data evaluation • Outliers • Data Trends • Seasonality • Final background data set with calculated prediction limits

19. Reporting • Notice of a Statistically Significant Increase • Verification Resampling Reports • Alternative Source Demonstrations (ASD) • Truly an ASD • Sampling or Analysis error • Error in Statistical Calculations

20. Annual Reporting • Annual detection monitoring report • 90 days after last monitoring event for the year • Annual assessment monitoring report • 60 days after the second semi-annual monitoring event for the year • Annual corrective action report • March 1st after the sampling year

21. Electronic Data • Please provide the annual report on CD • TCEQ 0312 forms • All laboratory data • Laboratory Quality Assurance / Quality Control Reports • Groundwater contour maps

22. Questions? • Thank You For Attending, • Eric Beller, P.G., Work Leader • MSW Permits Section, MC 124 • (512) 239-1177 • eric.beller@tceq.texas.gov