AWWA ACE68968

This powerpoint presentation begins by providing a brief overview of UCMR2 Methodology, and MWH Certification History. Method Challenges - 521 (the biggest challenge) are presented and include the following: long method development time - tried to use Methanol as CI agent but could not get consistent results; acetonitrile was finally used with O-ring stability problems; issues with parent/daughter ratios; 525.2 - was already in full production for all analytes; 527 - had to use 2 disks during extraction process due to breakthrough; 529 - modified GC temperature program for better peak shapes; and, 535 - bought new instrument due to need for gradient HPLC system. Preparation for UCMR2 is outlined, along with U.S. Environmental Protection Agency (USEPA) evaluations. The presentation addresses UCMR2 issues that include the following: CDX Inventory; Verifying Preservation; Reporting; Data Quality; and, Electronic Data Upload Glitches. Presentation conclusions indicate that: UCMR2 is a complex project, with many opportunities for "issues" but there haven't been as many as one would have expected; methods are more rugged than originally seen during development - practice makes perfect; and, the program is not "glitch free". Includes figures.