80 Environmental Impact Analysis
After excluding unrealistic alternatives based on obvious inability to meet
the purpose and need, 26 potentially realistic alternatives were identied.
These 26 alternatives were screened (see Chapter 5 for discussion of alterna-
tive screening) based on criteria developed to measure consistency with the
purpose and need statement. Based on the screening, 3 of the 26 alternatives
were found to meet the purpose and need:
• Process water treatment residuals at the Dalecarlia WTP, and dispose
via contract hauling. Process forebay residuals by current methods
and periodically haul off-site.
• Thicken water treatment residuals at Dalecarlia WTP and then
pump via a new pipeline to the D.C. WASA Blue Plai