[Federal Register Volume 66, Number 95 (Wednesday, May 16, 2001)]
[Corrections]
[Pages 27215-27216]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: C1-59]



  Federal Register / Vol. 66, No. 95 / Wednesday, May 16, 2001 / 
Corrections  

[[Page 27215]]



ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 141

[FRL-6920-6]
RIN 2040-AD58


Unregulated Contaminant Monitoring Regulation for Public Water 
Systems; Analytical Methods of List 2 Contaminants; Clarifications to 
the Unregulated Contaminant Monitoring Regulation

Correction

    In rule document 01-59 beginning on page 2273 in the issue of 
Thursday, January 11, 2001, make the following corrections:
    1. On page 2302, in Table 1.--Unregulated Contaminant Monitoring 
Reporting Requirements, item 15 should read as follows:

   Table 1.--Unregulated Contaminant Monitoring Reporting Requirements
------------------------------------------------------------------------
         Data Element                          Definition
------------------------------------------------------------------------
15. Analytical Accuracy......  Accuracy describes how close a result is
                                to the true value measured through the
                                use of spiked field samples. For
                                purposes of unregulated contaminant
                                monitoring, accuracy is defined as the
                                percent recovery of the contaminant in
                                the spiked matrix sample analyzed in the
                                same analytical batch as the sample
                                result being reported and calculated
                                using:
                               % recovery = [(amt. found in spiked
                                sample--amt. found in sample)/amt.
                                spiked]  x  100%.
------------------------------------------------------------------------

    2. On page 2303, in Table 1.--Unregulated Contaminant Monitoring 
Regulation (1999) List, the entry for ``Perchlorate'' should read as 
follows:

                                           Table 1.--Unregulated Contaminant Monitoring Regulation (1999) List
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                   List 1--assessment monitoring chemical contaminants
---------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                       6-period during
          1-contaminant             2-CAS registry number       3-analytical       4-minimum  reporting      5-sampling  location     which  monitoring
                                                                  methods                  level                                       to be  completed
--------------------------------------------------------------------------------------------------------------------------------------------------------
Perchlorate.....................  14797-73-0..............  EPA Method 314.0 l.  4 g/L m........  EPTDS f.................  2001-2003
--------------------------------------------------------------------------------------------------------------------------------------------------------

    3. On page 2304, in the table titled ``List 2--screening survey 
chemical contaminants'', the entry for ``Terbufos'' should read as 
follows:

[[Page 27216]]



--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                     List 2--screening survey chemical contaminants
---------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                       6-Period during
          1-contaminant             2-CAS registry number       3-Analytical       4-Minimum  reporting      5-sampling  location     which  monitoring
                                                                  methods                  level                                       to be  completed
--------------------------------------------------------------------------------------------------------------------------------------------------------
Terbufos........................  13071-79-9..............  EPA Method 526 a...  0.5 g/L f......  EPTDS e.................  2001--Selected
                                                                                                                                      Systems serving
                                                                                                                                      10,000
                                                                                                                                      persons;
                                                                                                                                     2002-Selected
                                                                                                                                      systems serving >
                                                                                                                                      10,000 persons.
--------------------------------------------------------------------------------------------------------------------------------------------------------


[FR Doc. C1-59 Filed 5-15-01; 8:45 am]
BILLING CODE 1505-01-D