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Water Quality Trading Assessment Handbook - Errata Sheet
October 2005
Minor errors have been corrected in the National Water Quality Trading Assessment Handbook. While the logic and analytic themes are accurate, there were some unrealistic numbers. Specifically the potential surplus reduction numbers in the Happy River Basin example were higher than possible because the example suggested some sources could control a phosphorus load greater than their starting phosphorus load. The phosphorus loads have been adjusted to make the numbers more feasible.
Changes are listed below
Page 10, Figure 2.2 and Page 24, Figure 2.5
Production Company
Current Load = 419
Target Load = 415
Total Reductions Needed = 4
Widgets
Current Load = 237
Target Load = 215
Total Reductions Needed = 22
Page 23 – Text Box revision
Acme Inc., Production Company, and Widgets Inc. (supply likely to meet demand)
The TMDL implementation plan assigns load targets to each facility. Acme needs to reduce 137 lbs./day, Production Company projects 4 lbs./day reduction, and Widgets needs to reduce 22 lbs./day. All of the facilities are investigating control technologies that have the potential for overcontrol beyond their needed reduction. Acme projects it would be able to supply Production Company and Widgets with the necessary pollutant reduction credits. And Production Company projects that with its control technology, they would be able supply Widgets with the needed credits for 22 lbs./day reductions. Thus it appears that supply and demand can be aligned among these three companies.
Page 38 – Figure 3.4
Production Company
Current Load = 535
Target Load = 415
Widgets
Current Load = 302
Target Load = 215