32 
Table V-1. Example summary pass/fail results for chlorophyll a criteria assessment. 
CHLOROPHYLL CRITERIA ASSESSMENT RESULTS (2008 INTEGRATED REPORT) 
CBP Segment 
Season 
Criteria Attainment 
% Excess non-attainment 
JMSTF1 (James TF Lower) 
Spring 
Fails 
26 
JMSTF1 (James TF Lower) 
Summer 
Fails 
47 
JMSTF2 (Jmes TF Upper) 
Spring 
Fails 
27 
JMSTF2 (Jmes TF Upper) 
Summer 
Fails 
26 
JMSOH (James Oligohaline) 
Spring 
Fails 
8 
JMSOH (James Oligohaline) 
Summer 
Meets 
0 
JMSMH (James Mesohaline) 
Spring 
Fails 
17 
JMSMH (James Mesohaline) 
Summer 
Fails 
22 
JMSTPH (James Polyhaline) 
Spring 
Fails 
8 
JMSTPH (James Polyhaline) 
Summer 
Fails 
29 
FUTURE DIRECTIONS 
Extractive chlorophyll a has been shown to significantly exceed fluorescent (YSI 
probe-based) chlorophyll a measured at verification stations at times (e.g., Virginia 
James River example), therefore necessitating calibration between the two measure¬ 
ment methods. While regression coefficients were calculated so as to account for 
season and segment-specific idiosyncrasies, the goodness of fit for the different cali¬ 
bration equations varied (Table V-2). 
Table V-2. Root mean square errors for segment-season calibration regressions 
with extractive and YSI probe-based chlorophyll a measures for tidal James River 
segments 1 . 
Segment 
Season 
R 2 
RSME 
JMSTFU 
Spring 
0.59 
6.21 
JMSTFU 
Summer 
0.79 
5.51 
JMSTFL 
Spring 
0.84 
4.83 
JMSTFL 
Summer 
0.92 
6.80 
JMSOH 
Spring 
0.68 
9.54 
JMSOH 
Summer 
0.23 
4.46 
JMSMH 
Spring 
0.96 
13.28 
JMSMH 
Summer 
0.95 
9.05 
JMSPH 
Spring 
0.69 
1.84 
JMSPH 
Summer 
0.89 
2.18 
'JMSTFU=James River. Tidal Fresh Upper Segment; JMSTFL=James River. Tidal Fresh Lower 
Segment; JMSOH=James River. Oligohaline Segment; JMSMH=James River, Mesohaline Segment; 
JMSPH=James River, Polyhaline Segment 
chapter v • Chlorophyll a Criteria Assessment Procedures 
