1 / 28

Bacteria Rulemaking

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. EPA Interim Agreement. 303d list Bacteria TMDL Over 5 MGD >100 cfu/100 ml

laban
Download Presentation

Bacteria Rulemaking

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Bacteria Rulemaking Inclusion of Bacteria Limits in TPDES Permits

  2. EPA Objections • EPA review • 303d list for bacteria • February 2007 –July 2008 • Approximately 100 draft permits not approved

  3. EPA Interim Agreement • 303d list • Bacteria TMDL • Over 5 MGD • >100 cfu/100 ml • New & amended permits • Oyster water • Effluent limits

  4. EPA Long Term Agreement • Propose rule by July 1, 2009 • Adopt rule by Dec 31, 2009 • Requires limits upon permit issuance • Objections to any permit without bacteria limits after Jan 1, 2010

  5. Rule Timeline • Proposal – May 20, 2009 • Comment Period • Jun 5 – Jul 5, 2009 • Adoption – Oct 28, 2009 • Effective – Nov 19, 2009

  6. Implementation • Next permit action • New • Renewal • Amendment • EPA agreement allows no compliance schedule • Recommend starting evaluations now

  7. Bacteria Permit Limits • Notification language in all permits • E. coli for fresh water • Enterococcus for salt water • Limits effective at issuance • No compliance schedule • Possible exceptions for small facilities

  8. E. coli Permit Limits • Fresh Water • Numerical limit in rule • OR • Refer to WQ Standards • WQ Standards changing • 126 cfu current • 206 cfu proposed

  9. Enterococcus Permit Limits • Salt water discharges • WQ Standards not changing • Numeric limit = 35 cfu

  10. Large Domestic Facilities • Interim Sampling Schedule • >50 MGD – 5/week • 20-50 MGD – 3/week • 5-20 MGD – 1/week • <5 –no monitoring

  11. Monitoring Frequencies • Based on permitted flow • Ultraviolet vs chlorine • Increased frequency: • application screening • 303d segment • sensitive water body

  12. Continued Need for Chlorine Testing • Retain • 4.0 mg maximum • 0.1 mg dechlor • Regular check between bacteria samples • Delay in bacteria results

  13. Chlorine Contact Chambers • Recommend evaluating now • If undersized or short-circuiting • Violating current regulations • No compliance schedule

  14. Sample Holding Times • Standard Methods 9221 & 9222 • Holding time – 6 hours • Travel time issues • SWQM in-stream variance

  15. Laboratory Issues • In-house testing without certification • Contract lab must be NELAC certified • Proximity to plant • Increased workload

  16. Pond Systems • 21-day retention time • Recommend evaluating • Capacities • Sample Locations • Wildlife impacts (birds, etc) • Compliance schedule for new construction

  17. Wet Weather Issues • Affects a limited number of facilities • Blending • Other options for stand-alone facilities that can’t meet limits

  18. Industrial Facilities • Bacteria limits for domestic outfalls • Commingled domestic and process outfalls • Internal outfalls vs external outfalls • Monitoring frequency

  19. Discussion Topics • Questions • Suggestions • Solutions

  20. Contact Us • Kent Trede • ktrede@tceq.state.tx.us • 512.239.1747 • Sherry Smith • shesmith@tceq.state.tx.us • 512.239.0571 • Chris Linendoll • clinendo@tceq.state.tx.us • 512.239.4515

  21. Fecal vs Residual Chlorine

  22. E. coli vs Residual Chlorine

  23. Possible Limit Scenarios • EPA national criteria = WQ Stds contact criterion • A % of EPA/WQS criteria -- safety factor • Primary contact criteria from WQS at permit issuance • Individual receiving stream criterion

  24. Freshwater E. coli 126 cfu/100 mls Saltwater Enterococci 35 cfu/100 mls Current WQ Stds

  25. Freshwater E. coli 206 cfu/100 ml Saltwater Enterococci 35 cfu/100 ml Proposed WQ Standards

  26. Current Standard E coli 394 cfu/100 ml Enterococci: 89 cfu/100 ml Proposed Standard E coli 399 cfu/100 ml Enterococci 104 cfu/100 ml Daily Maximum Limit

  27. Alternate Daily Max Method Daily max = Daily avg x (3.11/1.47) = Daily avg x 2.12 SIP established ratio (pg 57)

  28. Thanks for coming!

More Related