Literature Cited 
28 
IV. Revisions to the Chlorophyll a Criteria Assessment Methodology.31 
Background.31 
Review of the Current Chlorophyll a Criteria Attainment Assessment Procedure: 
Method and Assumptions.32 
Chlorophyll a: Data Skewness, Log Transformation and the Seasonal Mean 
Calculation.34 
Log normal character of chlorophyll a data.34 
James River focused analyses of log transformed chlorophyll a data for 
normality.35 
Chlorophyll a criteria Assessment Protocol Refinements using Log- 
Transformations.36 
Implications of the Revised Assessment Protocol.37 
Literature Cited.38 
Acronyms.41 
Appendices 
A. IBI Sample Size and Standard Deviations on 1BI Scoring When Screening 
Segments for Reference Community characterization.42 
B. Shape of the Biologically-based Reference Curve.46 
C. Derivation of the Deep-Water Biologically-Based Reference Curve.49 
D. History of EPA Guidance Regarding the Deep-Channel Reference Curve.52 
E. James River Chlorophyll a Data Normality Analysis Checking Normality of Log- 
Transformed Chlorophyll a Data.54 
F. SAS Computer Code for James River VA Chlorophyll a Normality Tests, Spring and 
Summer Season.57 
i 
