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Briefing Materials

This briefing material outlines cost allocation scenarios for DC and suburban projects, focusing on LTCP and TN, to prepare for upcoming meetings and analyses. It covers bases for allocation, types of projects, cost estimates, and... (500 characters limit reached)

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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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