1. Herbicides in Metro Atlanta Streams and Rivers Data Analysis Cristal Moon

2. Rivers Suwanee Creek Nickajack Creek Chattahoochee River

3. Questions Do herbicide levels have yearly trends? Are they related to other factors in surface water?

4. Variability of two Pesticides in Chattahoochee

5. Levels for Nickajack Creek

6. Levels for Suwanee Creek

7. Least Squares Regression + is levels, green line is regression, red bars are 95% confidence levels Error variance=0.3095 Correlation Coefficient= 0.1375 P-value=0.1814 Error variance=0.0089 Correlation Coefficient= 0.1681 P-value=0.1016

8. Normal? Chi2=4,337,300 Chi2inv=118.7516 Chi2>Chi2inv, therefore distribution is not normal Chi2= 527.3569, Chi2inv=118.7516 Chi2>Chi2inv, therefore distribution is not normal

9. Discharge vs. Herbicides Correlation Coefficient: 0.0374 P-value=0.7174 Correlation Coefficient: -0.0133 P-value= 0.8974

10. Specific Conductance vs. Herbicides Correlation Coefficient= -0.1757 P-value= 0.0868 Correlation Coefficient= -0.2161 P-value= 0.0344

11. pH Correlation Coefficient= 0.0063 P-value= 0.9515 Correlation Coefficient=-0.0919 P-value= 0.3732

12. Principle Component Regression Green is Least-Squares, Blue is Reduced Major Axis, Black is PCR

13. LSSA Significant frequencies (in Hz) at 0.97765 Corresponding powers: 16.0276 Significant frequencies (in Hz) at 0.97765 Corresponding powers: 8.7976

14. Conclusions Annual increase in herbicides early in year Linear increase over time Levels not related to pH or discharge Specific Conductance somewhat correlated