detroit wwtp npdes permit informational meeting michigan department of environmental quality october...
TRANSCRIPT
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Detroit WWTP NPDES Permit Informational Meeting
Michigan Department of Environmental Quality October 23, 2014
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Framework for Tonight’s Public Meeting
6:00 – 8:00 PM Introductions
DWSD and DEQ Presentations
Open discussion and questions
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DEQ Presentation
Background and National Pollutant Discharge Elimination System (NPDES) requirements
NPDES permit compliance during 2014
Upcoming NPDES permit requirements
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DWSD Presentation
Progress addressing WWTP noise and odor concerns
Wendy Barrott, General Manager
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Background
No longer Under Federal Court Order as of March 2013.
Under an Administrative Consent Order (ACO) with the DEQ for violations from 2009-2011.
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Detroit WWTP - Background
One of the largest WWTPs in the US Treats dry weather flow and significant wet
weather flow through secondary treatment up to 930 million gallons per day (MGD)
Treats wet weather flow through primary treatment up to 1700 MGD
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NPDES Permit
Permit MI0022802 issued March 1, 2013; effective May 1, 2013
Expires October 1, 2017
www.michigan.gov/deq Click on: Water, Surface Water, NPDES Permits Under Information click on Detroit Water and Sewerage
Department (DWSD)
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3 Key Issues Addressed
1. Sustained compliance with permit requirements
2. Reductions in authorized total phosphorus loads to help address Lake Erie algae
3. Adaptive Management CSO Control program; includes Green Infrastructure, considers Detroit residents’ finances
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1. Sustained Compliance - Facility Improvement Program
Includes ACO conditions that control the solids inventories at the WWTP
Requires construction of new solids dewatering equipment by 2016
Requires a Long-term Solids Disposal Plan Requires Asset Management to address
operation and maintenance issues Adjust effluent limits based on good operation
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Solids Handling – Long Term
Will Permanently Shut Down Incinerators in Complex C-l
6 incinerators built in the 1940s
Upgrade Incinerators in Complex C-ll 8 incinerators built in the 1970s Necessary to meet more stringent Federal
emission standards effective March 2016
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Biosolids Dryer Facility (BDF)
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BDF - Future Disposal
C-II In-cinera-
tion23428%
Drying31637%
Landfill & Land Appl.30035%
Peak Day850 dtpd
C-II In-cineration
7817%
Drying30568%
Land Ap-plication
4510%
Landfill225%
Average Day450 dtpdPeak
850 dtpdAverage Day
450 dtpd
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Asset Management is…
The practice of managing infrastructure assets
Minimizing the total cost of owning and operating them
Delivering the desired level of service
$$$$
$$
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2. Phosphorus Reduction Adjustment of Effluent Limits based on good O&M Monitoring periods at wet weather outfalls changed to
more quickly reflect good WWTP operation and maintenance
Effluent limits at wet weather outfalls adjusted to require well operated WWTP
Pollutant Former Limit(30 discharge days)
Current Limit(monthly average)
TSS 100 mg/l 70 mg/l
CBOD5 100 mg/l 40 mg/l
Total Phosphorus
2.5 mg/l 1.5 mg/l
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Reduction in Permitted Phosphorus Levels
Beginning 2015 WWTP secondary treated outfall reduced
from 1.0 mg/l to 0.7 mg/l as a monthly average
Growing season average of 0.6 mg/l (from April – September)
Based on levels the WWTP can achieve optimizing existing facilities
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Outfall 049B Phosphorus
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Detroit Total Phosphorus Loads
049B 049A
050A Treated CSOs
Untreated CSOs
Secondary treated outfall 049B to Detroit River – 80% of P load
Wet weather outfalls
050A
049A
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3. Adaptive CSO Control Program
Michigan’s CSO program started in 1988
Municipalities must either: eliminate the CSO or provide adequate treatment to meet all water quality
standards at times of discharge
Detroit’s collection system consists of basically all combined sewers
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Wet Weather – Uncontrolled CSOs
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Adaptive Management Program
Remaining CSOs (55) 17 CSOs remain to the Rouge River 38 CSOs to the Detroit River
An adaptive management approach for these will:
Use lessons learned from previous CSO projects and better discharge data
Consider the financial capability of DWSD and City residents
Consider reductions in stormwater flows by using an expanded Green Infrastructure (GI) program
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CSO Correction Progress
1993 20190
5
10
15
20
25
Untreated CSO (BGY)
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Green Infrastructure (GI)
How does Green Infrastructure reduce runoff?
More pathways for water to:• Soaks into the ground• Taken up by plants
Hard surfaces (like pavement and roofs) remove these pathways
Rainfall RainfallEvapo-transpiration
Evapo-transpiration
Runoff Runoff
Stream Baseflow
Stream Baseflow
Too much runoff sewer overflows
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Green Infrastructure (GI) – Parking Lots
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Green Infrastructure (GI)Vacant lot greening
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Compliance
NPDES Permit National Association of Clean Water
Agencies (NACWA) DWSD Wins Silver Peak Performance
Award (2013) 5 or fewer NPDES Permit violations in a
calendar year
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NPDES Permit Compliance Violations 2014
Date Outfall Parameter Limit Result
May 28, 2014 108A Fecal Coliform 400 cts/ 100 ml 1168 cts/100 ml
May 2014 049B TSS % removal 85% 84.4%
September 2014 107A Fecal Coliform 400 cts/100 ml 496 cts/100 ml
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ACO Compliance Violations 2014Date Description Limit Result
November 2013February 2014
Monthly solids inventory limit
750 dtpd 991 dtpd914 dtpd
April 1 – June 30 Quarterly average solids inventory
1000 dtpd 1332 dtpd
June 19, 2014 Provide secondary treatment for wet weather flow
June 19, 2014July 27, 2014August 13, 2014Sept 10-11, 2014
Failure to maintain pumping capacity to treat wet weather
min 1700 MGD
Sept 10-11, 2014 Prohibited discharge 20 MG @ Outfall 054
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2014 Accomplishments
Oakwood Pump Station and Retention Treatment Basin Project Performance Certification
Asset Management Program Approval
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Oakwood Pump Station and RTB PPC
The Oakwood CSO facilities (pump station and RTB) were constructed to eliminate discharges of raw, untreated sewage from Outfall 082 after June 1, 2012
October 23, 2013 - Submitted evaluation report
January 1, 2014 - PPC Approved
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Asset Management
Program Approved January 17, 2014 Inventory and Assessment of Fixed Assets Preventative Maintenance Program Assessment of Criticality and Risk Management Considers Capital Planning and Scheduled
Replacement Annual Reporting
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Upcoming Permit RequirementsAnnual Reports
Residuals Management Plan Wet Weather Operation Plan Asset Management Program Green Infrastructure Pollutant Minimization Program for Total Mercury
and Total PCBs Collection System & CSO treatment facility Op
Plan
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Residuals Management Program (RMP)
RMP approved April 22, 2008 to authorize land application of bulk biosolids or prepare bulk biosolids for land application
Currently working with DEQ to revise the Program to account for disposal and use of product from the BDF
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Wet Weather Operation Plan
Details necessary requirements to maximize wet weather treatment at the WWTP while complying with effluent limits and all other permit conditions
Minimize untreated combined sewage in the tributary collection system
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Collection System & Treatment Facility Operation Plan
Coordinated with the WWTP Wet Weather Op Plan
All dry weather flows are conveyed to the treatment facilities without bypass
Max wet weather flow is conveyed to the treatment facilities to minimize untreated discharges
Ongoing inspection of the sewer system within the City to reduce I/I and eliminate unauthorized connections
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Pollutant Minimization Program (PMP) for Total Mercury and PCBs
PMP approved November 9, 1995 and updated October 1996
The goal of the PMP is to maintain the effluent concentration for total HG at or below 1.3 ng/L
Implement reasonable cost effective control measures when sources of HG/PCBs are discovered
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Upcoming Permit Requirement RRO2 Segment 2 Design
December 1, 2014 submittal of Final Plans and Specifications
New design proposed to use existing plant infrastructure; will require a permit modification
Much less cost No extension for final construction
completion (April 1, 2019)
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Summary
DEQ WRD and DWSD commitment to meet with stakeholders to discuss WWTP issues
Provided Information regarding:
1) Noise and Odor
2) NPDES Permit Compliance
3) Upcoming Permit requirements
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QuestionsDiscussionComments
Contact:
Phil Argiroff: [email protected]
Laura Verona: [email protected]