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CCC-SC-28
Difference Between 16-year and 82-year Analyses of Water Quality Impacts
Figure 1: Increases in specific conductance (EC) on Old River at Bacon Island for water years 1922-2003 and 1976-1991 (82-years and 16-years, respectively). The water quality data are from the WaterFix Biological Assessment (BA) Proposed Action (PA) and No Action Alternative (NAA) at Early Long Term (ELT). (SWRCB-104). Using only a 16-year average underestimates the adverse impacts in February-June and overestimates the
simulated benefits in November-January.
CCC-SC-28 Difference Between 16-year and 82-year Analyses of Water Quality Impacts Page 2
Figure 2: 16-year and 82-year averages of Bacon EC data for March from the Biological Assessment modeling with the Proposed Action EC plotted as a function of the No Action Alternative EC (red square and blue diamond, respectively). Because this
location is close to a D-1641 Municipal and Industrial compliance location, equivalent chloride concentrations of 150 mg/L is also shown. The equivalent 100 mg/L chloride
concentration is plotted for comparative purposes.
CCC-SC-28 Difference Between 16-year and 82-year Analyses of Water Quality Impacts Page 3
Figure 3: 16-year subset of daily-averaged Bacon EC data for March from the Biological Assessment modeling with the Proposed Action EC plotted as a function of the No
Action Alternative EC (496 data points). Also shown are the corresponding 16-year and 82 year averages (red square and blue diamond). Because this location is close to a D-
1641 Municipal and Industrial compliance location, equivalent chloride concentrations of 150 mg/L is also shown. The equivalent 100 mg/L chloride concentration is plotted for
comparative purposes.
CCC-SC-28 Difference Between 16-year and 82-year Analyses of Water Quality Impacts Page 4
Figure 4: 82-years of daily-averaged Bacon EC data for March from the Biological Assessment modeling with the Project Action EC plotted as a function of the No Action Alternative EC (2,542 data points). Also shown are the corresponding 16-year and 82-
year averages for March (red square and blue diamond). Because this location is close to a D-1641 Municipal and Industrial compliance location, equivalent chloride concentrations of 150 mg/L is also shown. The equivalent 100 mg/L chloride
concentration is plotted for comparative purposes.
CCC-SC-28 Difference Between 16-year and 82-year Analyses of Water Quality Impacts Page 5
Figure 5: 82-years of daily-averaged Bacon EC data for November from the Biological Assessment modeling with the Project Action EC plotted as a function of the No Action
Alternative EC. Also shown are the corresponding 16-year and 82 year averages for March (red square and blue diamond). Because this location is close to a D-1641
Municipal and Industrial compliance location, equivalent chloride concentrations of 250 mg/L and 150 mg/L are also shown.
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