1. LTCP and TN Cost Allocation
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. Bases for Cost Allocations
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
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
Blue Plains Tunnel
73 mg total
ECF
225 mgd
Tunnel Dewatering Pumping 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
$ 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 Projects10

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

14. Summary Suburban Cost ($M) D.C. Cost ($M) Item Total Cost ($M) Low
High
CSO Program (1)
LTCP – DC Only
$410.5 -
LTCP – DC + Subs
$1,322.1
$79.3
$167.9
$1,154.2
$1,242.8
TN Program
Pure TN – DC + Subs
$686.1
$403.3
$282.8
Mixed TN & LTCP
$436.0
$117.3
$129.2
$306.8
$318.7
GRAND TOTAL
$2,854.7
$599.9
$700.4
$2,154.3
$2,254.8
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.