1. Methodology to Distribute Target Loads
Principals’ Staff Committee
10/23/2009
Bob Koroncai - Gary Shenk

2. Review of Target Load Method

3. Relative Effectiveness is a combination of Watershed Delivery and Estuarine Delivery
Low Delivery || \/
High Delivery
Potomac Estuarine
Effectiveness
James Estuarine
Effectiveness

4. 10%
20%
34%
73%
69%
100%
81%
100%

5. Review of Target Load Method from April2 2 2 2 2

6. How Many lines?
Note: Basin-Jurisdictions have single target load no matter how many lines

7. Appropriate Slope?

8. Shape of the lines

9. Distance Between Lines

11. Preferences of WQGIT Number: 2 lines, WWTP and all else
Shape: Open to all
WWTP: Set WWTP at a high level and meet water quality goals with other loads
Slope: 20%
Considered 5 options and reached a unanimous recommendation to forward the 2 following options

12. 4.5 mg/l
8 mg/l
20 percent slope
Option A

13. 4.5 mg/l
8 mg/l
20 percent slope
Option B

14. 0.22 mg/l
0.53 mg/l
Option A
20 percent slope

15. 0.22 mg/l
0.53 mg/l
Option B
20 percent slope

18. Decision Requested . . . after lunch
Does the PSC prefer option A or option B as the initial working target loads for the purpose of starting the watershed implementation planning?