The Stage 2 D/DBPR and LT2ESWTR--Where are We Going. J. Alan Roberson, P.E. Director of Regulatory Affairs AWWA-Washington, DC. Outline. Overview of the M/DBP Cluster Overview of IESWTR and Stage 1 D/DBPR Preliminary ICR Data Analysis Where the LT2ESWTR and Stage 2 D/DBPR May Be Going.
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J. Alan Roberson, P.E.
Director of Regulatory Affairs
Utility and Plant Level Data
Sampling Results Data
Treatment Operation DataAuxiliary Database Relationships
CT & Disinfectant Decay
Sludge Production .
Distribution System DBPs
Model Interface/ Database
Incorrect of Concern
Classifying Potential CategoriesDistinguish relative amounts of Cryptosporidium in source water
Plant Highest Running Action to Reduce
Category Annual Mean Exposure
A < 0.01/L No Action
B > 0.01/L to < 0.1/L No Action/“Toolbox ”
C >0.1/L to < 1.0/L “Toolbox”
D >1.0/L “Toolbox ”
Challenges = (1) assigning category shift values and
(2) implementation transaction costs for utilities and States