TM11-02 Removal of bisphenol A, pentachlorophenol, and bisphenol A-d3 surrogate from laboratory schedule 1433; removal of bisphenol A and bisphenol A-d3 surrogate from LS 2249; and removal of benzidine from LS 1383

Effective on or after July 18, 2011, the NWQL will no longer include the following four analytes in selected laboratory schedules: LS 1433: 

● Bisphenol A (parameter-method code 62069GCM37) 
● Pentachlorophenol (parameter-method code 34459GCM37) 
● Bisphenol A-d3 surrogate (parameter-method code 99583GCM37) LS 2249: 
● Bisphenol A (parameter-method code 62069GCM37) 
● Bisphenol A-d3 surrogate (parameter-method code 99583GCM37) LS 1383: 
● Benzidine (parameter-method code 39120GCM55) The NWQL recognizes the importance of these compounds, especially bisphenol A, in environmental monitoring. A summary of affected laboratory schedules, parameters names, and suggested alternative laboratory schedules is presented in table 1. As an alternative, LS 4433 is available for analysis of bisphenol A and pentachlorophenol. Schedule 4433 is the unfiltered water equivalent of LS 1433. Bisphenol A is available in the hormone analyses, currently a custom method for filtered water, whole water, or sediment. The Techniques and Methods report for the hormones in waters methods is currently in the approval process. Pentachlorophenol is also available in LS 1383 (unfiltered water). Currently, the NWQL does not have an alternative method for benzidine analysis. The NWQL adds bisphenol A-d3 to samples as a surrogate to help monitor method performance; it has no environmental significance.