) 
Using a dataset with all duplicate records appropriately removed and all appropriate screening 
criteria applied, the error rate for the “Point Method” is zero. In this case, all segment-periods 
classified as “healthy” using the recommended screening criteria (n >_10, SD < 1.0) pass the 
EPA recommended deep-water biologically-based reference curve, and all segment-periods 
classified as “degraded" fail the recommended biologically-based reference curve (Tables B-l 
and B-2). 
Table B-l. Segment classifications using the recommended screening criteria: deep-water 
designated use. 
Method 
Correct 
Incorrect 
Healthy Segments 
Passing 
Degraded 
Segments Failing 
Healthy Segments 
Failing 
Degraded Segments 
Passing 
Published “Point” 
Method 
100% 
100% 
0% 
0% 
Proposed “Area” 
Method 
100% 
100% 
0% 
0% 
Table B-2. Segment-period classifications under the recommended method: deep-water 
designated use. 
Method 
Correct 
Incorrect 
Healthy Segments 
Degraded Segments 
Healthy Segments 
Degraded 
Passing 
Failing 
Failing 
Segments Passing 
Published “Point” 
CB6PH 1996 1998 
PAXMH 1996 1998 
Method 
CB7PH 1996 1998 
POTMH 1996 1998 
CB6PH 1997 1999 
PAXMH 1997 1999 
CB7PH 1997 1999 
POTMH 1997 1999 
CB7PH 1998 2000 
POTMH 1998 2000 
CB6PH 1999 2001 
PAXMH 1999 2001 
CB7PH 1999 2001 
POTMH 1999 2001 
CB7PH 2000 2002 
PAXMH 2000 2002 
CB6PH 2004 2006 
RPPMH 2000 2002 
CB7PH 2004 2006 
PAXMH 2001 2003 
PAXMH 2002 2004 
PAXMH 2003 2005 
PAXMH 2004 2006 
RPPMH 2004 2006 
Proposed “Area” 
CB6PH 1996-1998 
POTMH 19992001 
Method 
CB6PH 1997-1999 
POTMH 19982000 
CB6PH 1999-2001 
RPPMH20022004 
CB6PH 2004-2006 
PAXMH 19992001 
CB7PH 1996-1998 
PAXMH20012003 
CB7PH 1997-1999 
PAXMH20042006 
CB7PH 1998-2000 
POTMH 19971999 
CB7PH 1999-2001 
PAXMH20032005 
CB7PH 2000-2002 
PAXMH20002002 
CB7PH 2004-2006 
POTMH 19961998 
RPPMH20002002 
PAXMH20022004 
PAXMH 19961998 
PAXMH 19971999 
> 
47 
