Update on PI Modeling and Nitrogen Removal at Blue Plains

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Presentation transcript:

Update on PI Modeling and Nitrogen Removal at Blue Plains Briefing Materials Update on PI Modeling and Nitrogen Removal at Blue Plains Presented to: Blue Plains Regional Committee By: District of Columbia Water and Sewer Authority October 25, 2007

Agenda Fairfax request for additional flow in PI Nitrogen Regulatory update Cost allocation of nitrogen removal facilities Poundage / allocation – upcoming issues

PI Model: Fairfax Request for Additional Flow Approach: Revise relationships predicting peak flow vs. rain based on new data Obtain suburban & WASA flow data Recalibrate model based on new data Evaluate 5, 10 & 15-year storm Field visit MH’s with predicted overflows Assess whether additional flow can be added

Status of PI Work Activity Status Comments 1. Obtain flow data Received data from WASA, Fairfax, WSSC No data from LCSA LCSA data may not be available in useable form Recommend using previously developed relationships 2. Develop wet weather relationships Completed Need to review with CH2M Hill 3. Recalibrate model 4. Evaluate 5,10, 15 yr storms 5. Field visit manholes In progress Should have results for December meeting (including CH2M Hill review)

Nitrogen Update: TN/WW Plan Facilities Part of TN/WW Plan Facilities in LTCP Nitrogen Update: TN/WW Plan N Northeast Boundary Tunnel Anacostia CSO Tunnel Existing Sewers Extend CSO Tunnel to Blue Plains- 31 mg Added Storage Current Facility Plan Alignment Overflow to Tunnel Main & O Terminus RFK Stadium TDPS at Blue Plains Anacostia River Tunnel Alternate alignment under consideration Anacostia River 225 mgd 555 mgd Excess Flow Treatment: ECF Complete Treatment ENR Bolling Overflow Tunnel Tunnel to Blue Plains Potomac River Outfall 001 (CSO Bypass) Outfall 002 Blue Plains Tunnel Dewatering Pump Station & ECF at Blue Plains Recommended Plan - Alternative D 5

Nitrogen Update: Recent Events April 13, 2007 – Draft TN/WW Plan submitted to EPA May to Sept 17, 2007 - public comment period Only received comments from EPA Oct 12, 2007 – Submitted Final TN/WW Plan to EPA Anticipate modifying LTCP Consent Decree to incorporate plan Substantive changes between Draft & Final Plan: Schedule in Final Plan Place TN facilities in operation: July 1, 2014 Start TN compliance: 1st full calendar year after placing facilities in operation Place Wet Weather Facilities in Operation: March 23, 2018 Item Draft Plan Final Plan Complete treatment flow rates 555 mgd 1st 4 hrs 511 mgd next 24 hrs 450 mgd thereafter 511 mgd thereafter Permitting Status of Outfall 001 Permit as CSO Bypass Permit as CSO Outfall Based on EPA approval of plan by 1/1/2008

Cost Allocation of Nitrogen Removal Facilities BPWWTP Site Off Site Poplar Point Spills to Tunnel when Q > complete treatment capacity Up to 1076 from all sources 555/511 West P.S. Outfall 002 Filters & Disinf. ENR Prim & Sec 555/511 East P.S. Up to 521 mgd Fine Screen & Grit for ECF TDPS 225 mgd Shaft Outfall 001: CSO New ECF 225 mgd Anacostia CSO facilities Disinf. 170 mgd Tunnel 55 mgd 185/4 hrs= 31 mg LEGEND Existing facilities Joint Use – split based on 370 mgd Joint Use – split based on agreed LTCP split Anacostia River

TN Allocation Issues: Outfall 001 NPDES Permit Modification Allocates all 4.689 mil lbs to 002 Didn’t address outfall 001 EPA says intent was for 4.689 mil lbs to apply to sum of 001 + 002 001 loads are highly variable Estimate about 0.18 mil lbs/average yr TN Depends a lot on rain – both DC and suburban flow WASA’s recommendation to EPA: Make 002’s allocation = 4.689 – 0.18 = 4.509 mil lbs Treat 001 as a CSO with an allocation of 0.18 mil lbs No TN permit limit for 001, evaluate it based on post construction monitoring Recognizes that TN for 001 will go up and down dramatically with rainfall Consistent with CSO Policy & handling of CSOs in TMDLs

ANNUAL AVG FLOW AND TN ALLOCATION TN Allocation Issues: Required Nitrogen Removal is not Proportional to Flow ITEM ANNUAL AVG FLOW AND TN ALLOCATION TOTAL D.C. MD VA A. BP IMA Flow Allocations – MGD 1. D.C. 148.0 2. WSSC 169.6 3. Fairfax CO 31.0 4. P.I. Flows ▪ LCSA 13.8 ▪ Town of Vienna + Dulles Airport 3 ▪ Navy + NPS 0.1 ▪ Future PI Users (D.C.) 4.5 Total – MGD) 370.0 152.5 169.7 47.8 B. Blue Plains TN Allocation. LBS/YR (Effluent Allocation) 4,689,000 2,115,000 1,993,000 581,000 1. MG/L Effluent Required at Flow Allocation 4.16 4.56 3.86 3.99

TN Allocation Issues: Impact of Flow Offloading 77,000 lb/yr reduction for BP flows going to Seneca Blue Plains allocation reduced, but plant capacity not reduced Options / Implications Reduce plant capacity rating to match TN allocation Improve nitrogen treatment (limit of technology) Pay in proportion to nitrogen removed TN Load Allocation (mil lbs/yr) Source EPA 7/28/2005 Letter NPDES Permit Fact Sheet DC CSO after LTCP 0.0053 DC BP CSO Bypass (001) - DC non-point sources 0.28 DC portion of BP 2.115 Total DC 2.4 MD part of BP 2.007 1.993 Virginia part of BP 0.581 Total Suburbs 2.6510 2.574 Total Blue Plains 4.766 4.689