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Issue 4a 150 mg/L M&I Chloride Objective

Issue 4a 150 mg/L M&I Chloride Objective. Richard A. Denton Water Resources Manager Contra Costa Water District. 150 mg/L M&I Chloride Objective. Established in D-1485 (August 1978)

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Issue 4a 150 mg/L M&I Chloride Objective

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  1. Issue 4a 150 mg/L M&I Chloride Objective Richard A. Denton Water Resources Manager Contra Costa Water District

  2. 150 mg/L M&I Chloride Objective • Established in D-1485 (August 1978) • Maintain a chloride concentration of 150 mg/L chloride or better at either the Contra Costa Canal at Pumping Plant #1 or San Joaquin River at Antioch Water Works Intake for at least a given number of days each calendar year, depending on water year type: • Wet 240 days (66% of year) • Above Normal 190 days (52%) • Below Normal 175 days (48%) • Dry 165 days (45%) • Critical 155 days (42%)

  3. Compliance Locations for 150 Objective Antioch Pumping Plant CCWD Pumping Plant #1 • Met at either Pumping Plant #1 or Antioch Pumping Plant • Must be met for 14 days consecutively to count

  4. More Days of 150 mg/L Generally Occur Than Required in 1995 Plan Feb-June X2 in effect

  5. No Difference Between Calendar Year and Water Year Accounting More Days with Water Year Accounting More Days with Calendar Year Accounting

  6. Conclusions • 150 mg/L M&I objective should not be eliminated • Would degrade drinking water quality • Objective generally met historically without affecting operations • One recent exception is 1992 drought year • X2 estuarine habitat objective (February – June) makes 150 objective easier to meet • No compelling reason to change from calendar year to water year • If this was modified, need to ensure there is no net degradation of water quality for CCWD

  7. Pumping Plant #1 Chlorides During Drought (1990-1992)

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