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Changes to Regulations

This document outlines the recent changes to regulations resulting from the Triennial Review mandated by state and federal regulations in Colorado. Key updates include new definitions, methodologies, and clarification on effluent and ambient quality-based standards, as well as temporary modifications and antidegradation provisions. The revisions also address temperature, ammonia, and metals standards, including aluminum and arsenic guidelines. Updates to discharge permits and site-specific standards ensure compliance with basic standards for water quality, enhancing ecosystem health and public safety.

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Changes to Regulations

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  1. Changes to Regulations • Triennial Review • Required by State & Federal Regs • Colorado Process 5 years • Required for; • Basic Standards • Stream Standards • Site Specific Standards • Other regulations

  2. Standards implementation Basic Stds Discharge Permit Stream Stds >2008 June 2005 Arkansas River 2008

  3. Basic Standards 2005 • New definitions • Effluent dependent stream • Effluent dominated stream • E.coli • Ambient Quality Based Stds. • Clarification (95th percentile) • Temporary Modifications • Clarification (Reg.31 & 61)

  4. Basic Standards 2005 cont. • Antidegradation Provisions • Use protected designation • Change methodology • Statewide Standards • Clarification of radionuclide analysis • Add Tributyltin (TBT) • Recreation Classification

  5. Basic Standards 2005 Cont. • Temperature Standards • Daily Maximum (“DM”) • Cold 23.8 C • Warm 32.5 C • Cool 29.4 C • Maximum weekly average Maximum temperature (“MWAT”) • Cold 19.3 C • Warm 29.2 C • 24.2 C

  6. Basic Standards 2005 Cont. • Ammonia Standards • EPA’s 1999 criteria • New calculation • Total –vs- unionized • Impacts to POTWs • Cold water – some relief • Warm water – more stringent (LOWER NH3)

  7. Basic Standards cont. • Metals • Aluminum • Revise based on pH • Arsenic • Acknowledge MCL • Antimony • Eat more fish • Others-

  8. Standards implementation Basic Stds Discharge Permit Stream Stds >2008 June 2005 Arkansas River 2008

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