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What is IDEM doing now?!

What is IDEM doing now?!. LTCP Approvals CSO Storage & Treatment & Other Alternative Actions. LTCP Summary. Indiana has a baseline of 107 CSO communities Indiana has committed to having 65 communities by 2007 in an enforceable mechanism to ensure compliance with the Policy.

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What is IDEM doing now?!

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  1. What is IDEM doing now?! LTCP Approvals CSO Storage & Treatment & Other Alternative Actions

  2. LTCP Summary • Indiana has a baseline of 107 CSO communities • Indiana has committed to having 65 communities by 2007 in an enforceable mechanism to ensure compliance with the Policy. • at least 10 additional communities by 2008 • remaining communities will be addressed by the end of 2009

  3. LTCP Approvals 2007 Work Plan required • Completion in 5 years; NPDES cycle • Agreed Order for minor facility • SJA for Major and impaired waterbody

  4. Established Goals • (IDEM) Workplan • incorporates EPA targets and priorities, • primarily major municipal NPDES permittees where the CSO discharges are in the Great Lakes Basin, • and/or contributing to a 303d waterbody listed as impaired for E. coli. • In the 2005 legislative session, Senate Enrolled Act 620, signed by Governor Daniels on April 21, 2005, gives IDEM the authority under IC 13-14-2-6 to incorporate LTCPs into a state court order (state consent decree). • Referred to as a State Judicial Agreement (SJA), is expected to function judicially as a federal consent decree.

  5. CSO Treatment Facility • Detention time for solids removal and disinfection should be calculated on the basis of maximum hourly flow. • Sewer system response should be estimated using data and appropriate engineering models (SWMM, etc.) • Retention/CSO Treatment Facilities should be configured to optimize solids removal and disinfection.

  6. CSO Treatment Facility • Dewatering times should be less than 48 hours from the time when rainfall ceases. • All combined sewage retained in the facility should be transported to the WWTP and receive full treatment at the WWTP, regardless of storm size • Combined sewage Facilities should be designed and operated to meet an appropriate level of TSS control to ensure effective disinfection

  7. Pivoting Flushing Troughs After a storm event, flows captured in a Retention Treatment Basin are drained back to the Wastewater Treatment Plant (WWTP) for additional treatment. Pivoting Flushing Troughs are used to flush down remaining sediment from the basin. This material is also treated at the WWTP. Picture of Installed Pivoting Flushing Trough

  8. Enforcement Discretion • For discharges from a storm event, rainfall amount, or intensity which exceed the design capacity of the facility • Facility properly designed, operated and maintained • Approved wet weather operating procedures followed • Appropriate documentation and record keeping

  9. LTCP Approval … Alternatives and phased projects peak flows, wet weather design Monitoring and CSOOP updates storm events - multiple locations Maximization of WWTP performance recombination and bypass review CSO DMR Reporting Update Rainfall data Periodic Re-Evaluation 5 year cycle

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