TM02-03 Permanent application of the Estimated (E) Remark Code for Malathion and Disulfoton data reported by Lab Schedule 1319 (Organophosphate Pesticides in Water)

This technical memorandum is intended to report the variable performance of two constituents, malathion and disulfoton, in the National Water Quality Laboratory lab schedule 1319 and the application of a permanent estimated (E) remark code for all reported concentrations of these two compounds. Some key method changes also are outlined in this document.