town of milliken regulation no. 38 rulemaking hearing june 8-10

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Town of Milliken Regulation No. 38 Rulemaking Hearing June 8-10

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Page 1: Town of Milliken Regulation No. 38 Rulemaking Hearing June 8-10

Town of Milliken

Regulation No. 38 Rulemaking Hearing

June 8-10

Page 2: Town of Milliken Regulation No. 38 Rulemaking Hearing June 8-10

Town of Milliken

Page 3: Town of Milliken Regulation No. 38 Rulemaking Hearing June 8-10

June 8, 2015: Regulation #38 South Platte Basin RMH

June 15, 2015: Completion of Alternate Supply evaluation report

December 2018: Temporary Modification RMH

December 2019: Temporary Modification RMH

December 31, 2020: Proposed selenium Temporary Modification expires

July 15, 2015: Completion of detailed study plan for fish survey

2016: Likely Milliken RO Discharge permit renewal

2015: Conduct initial phase of fish survey study

Town of Milliken

June 8, 2015: Regulation #38 South Platte Basin RMH

June 15, 2015: Completion of Alternate Supply evaluation report

December 2018: Temporary Modification RMH

December 2019: Temporary Modification RMH

July 15, 2015: Completion of detailed study plan for fish survey

2016: Likely Milliken RO Discharge permit renewal

2015: Conduct initial phase of fish survey study

Page 4: Town of Milliken Regulation No. 38 Rulemaking Hearing June 8-10

Basis for Selenium Temporary Modification

• Demonstrated permit compliance problem

• Significant uncertainty (Type A and B)

• Ambient-based value = 12.3 µg/L

Town of Milliken

Page 5: Town of Milliken Regulation No. 38 Rulemaking Hearing June 8-10

Summary of Proposal

• Revise the existing temporary modification for dissolved selenium from a numeric value of 13.1 µg/L to a numeric value of 12.3 µg/L.

• Extend the temporary modification from December 31, 2015 through December 31, 2020

Town of Milliken