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Briefing Materials

Briefing Materials. LTCP and TN Cost Allocation. Presented to:. Blue Plains Technical Experts Working Group. By: District of Columbia Water and Sewer Authority December 12, 2008. Purpose. Prepare for Jan 7, 2009 CAO meeting

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Briefing Materials

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  1. Briefing Materials LTCP and TN Cost Allocation Presented to: Blue Plains Technical Experts Working Group By: District of Columbia Water and Sewer Authority December 12, 2008

  2. Purpose • Prepare for Jan 7, 2009 CAO meeting • Present range of potential DC/suburban cost allocations for LTCP and TN based on WASA technical analyses

  3. LTCP Differentiate between D.C.-only vs joint use projects Estimate suburban cost based on range of 6 to 12.7 % per Nov. 20, 2008 CAO meeting TN Estimate suburban cost based on 370 mgd IMA allocation Bases for Cost Allocations • Mixed LTCP & TN • Identify use (volume, flow rate, etc.) for LTCP vs TN • For LTCP: estimate suburban cost based on range of 6 to 12.7 % • For TN, estimate suburban cost based on 370 mgd allocation

  4. Mixed LTCP & TN - Facilities Northeast Boundary Tunnel = LTCP = Mixed LTCP & TN Anacostia River Tunnel = Pure TN ECF 225 mgd Blue Plains Tunnel 73 mg total Tunnel Dewatering Pumping Station @ BP Enhanced Clarification 31 mg for TN • - 170 mgd planned for LTCP • 225 mgd needed overall • 55 mgd for TN Required only for TN (Replaces 336 mgd excess flow facilities)

  5. Enhanced Clarification Facility • Not required for CSO control – can meet WQS under LTCP without it • Needed for TN • Required for peak flow reduction so overall pollutant loads to river are less with peaking factor of 1.5 vs 2.0 for peak plant flows • Key basis for EPA accepting plan

  6. Overview of Costs and Categories LTCP – DC Only $410.5 M LTCP – DC + Subs $1,322.1 M DC Only CSO Program $2,360.5 Other Projects $364.5 M DC + Subs CSO & TN $3,219.2 M Mixed LTCP & TN – DC + Subs $436.0 M TN Program $858.7 Pure TN – DC + Subs $686.1 M

  7. CSO Program – LTCP (DC Only)

  8. CSO Program – LTCP (DC + Subs) 8

  9. CSO Program – Other Projects • Examples: • Pumping station rehabilitations • Siphon cleaning • Blue Plains influent sewer rehabilitations • Procedures already established for determining: • Joint use vs non-joint use • Cost allocation

  10. CSO Program – Other Projects 10

  11. Mixed LTCP & TN - Facilities Calculation of Percentages: Calculation of Cost: 11

  12. Pure TN (DC + Subs)

  13. Evaluate TN Savings for Current Plan vs. No Change in Peaking Factor ($1.4 Billion Plan)

  14. Summary Note: 1. CSO Program costs not directly tied to LTCP are budgeted at $364.5 M. These costs are not included since they will be allocated using procedures already established.

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