Transcript www.tceq.state.tx.us

Bacteria
Rulemaking
Inclusion of Bacteria Limits
in TPDES Permits
EPA Objections
EPA review
 303d list for bacteria
 February 2007 –July 2008
 Approximately 100 draft
permits not approved
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EPA Interim Agreement
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303d list
Bacteria TMDL
Over 5 MGD
>100 cfu/100 ml
New & amended permits
Oyster water
Effluent limits
EPA Long Term Agreement
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Propose rule by July 1, 2009
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Adopt rule by Dec 31, 2009
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Requires limits upon permit issuance
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Objections to any permit without bacteria
limits after Jan 1, 2010
Rule Timeline
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Proposal – May 20, 2009
Comment Period
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Jun 5 – Jul 5, 2009
Adoption – Oct 28, 2009
Effective – Nov 19, 2009
Implementation
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Next permit action
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New
Renewal
Amendment
EPA agreement allows no
compliance schedule
Recommend starting
evaluations now
Bacteria Permit Limits
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Notification language in all permits
E. coli for fresh water
Enterococcus for salt water
Limits effective at issuance
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No compliance schedule
Possible exceptions for small facilities
E. coli Permit Limits
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Fresh Water
Numerical limit in rule
 OR
Refer to WQ Standards
WQ Standards changing
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126 cfu current
206 cfu proposed
Enterococcus Permit Limits
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Salt water discharges
WQ Standards not changing
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Numeric limit = 35 cfu
Large Domestic Facilities
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Interim Sampling
Schedule
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>50 MGD – 5/week
20-50 MGD – 3/week
5-20 MGD – 1/week
<5 –no monitoring
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Monitoring Frequencies
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Based on permitted flow
Ultraviolet vs chlorine
Increased frequency:
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application screening
303d segment
sensitive water body
Continued Need for
Chlorine Testing
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Retain
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4.0 mg maximum
0.1 mg dechlor
Regular check
between bacteria
samples
Delay in bacteria
results
Chlorine Contact Chambers
 Recommend
evaluating now
 If undersized or short-circuiting
Violating current regulations
 No compliance schedule
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Sample Holding Times
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Standard Methods 9221 & 9222
Holding time – 6 hours
Travel time issues
SWQM in-stream variance
Laboratory Issues
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In-house testing
without certification
Contract lab must be
NELAC certified
Proximity to plant
Increased workload
Pond Systems
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21-day retention time
Recommend evaluating
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Capacities
Sample Locations
Wildlife impacts (birds, etc)
Compliance schedule for new construction
Wet Weather Issues
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Affects a limited number of facilities
Blending
Other options for stand-alone
facilities that can’t meet limits
Industrial Facilities
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Bacteria limits for
domestic outfalls
Commingled domestic
and process outfalls
Internal outfalls vs
external outfalls
Monitoring frequency
Discussion Topics
 Questions
 Suggestions
 Solutions
Contact Us
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Kent Trede
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Sherry Smith
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[email protected]
512.239.1747
[email protected]
512.239.0571
Chris Linendoll
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[email protected]
512.239.4515
Fecal vs Residual Chlorine
Minor municipal facilities
Fecal coliform (log of #/100 ml)
(114 data points)
4
3.5
3
Fecal Coliform
(log)
2.5
2
Single sample
maximum log
(2.6)
1.5
1
0.5
Geometric
mean log (2.3)
0
0
5
10
15
residual chlorine (mg/L)
20
E. coli vs Residual Chlorine
Minor municipal facilities
E. coli (log of #/100 ml)
(114 data points)
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
E. coli log
Single sample
maximum log (2.6)
Geometric mean log
(2.1)
0
5
10
15
residual chlorine (mg/L)
20
Possible Limit Scenarios
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EPA national criteria = WQ Stds contact criterion
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A % of EPA/WQS criteria -- safety factor
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Primary contact criteria from WQS at permit
issuance
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Individual receiving stream criterion
Current WQ Stds
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Freshwater
E. coli
126 cfu/100 mls
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Saltwater
Enterococci
35 cfu/100 mls
Proposed WQ Standards
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Freshwater
E. coli
206 cfu/100 ml
Saltwater
Enterococci
35 cfu/100 ml
Daily Maximum Limit
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Current Standard
E coli
 394 cfu/100 ml
Enterococci:
 89 cfu/100 ml
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Proposed Standard
E coli
 399 cfu/100 ml
Enterococci
 104 cfu/100 ml
Alternate Daily Max Method
Daily max =
Daily avg x (3.11/1.47) =
Daily avg x 2.12
SIP established ratio (pg 57)
Thanks for coming!