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North Canadian River Oklahoma River Shell Creek Draft TMDLs For Bacteria. 2 nd PUBLIC MEETING September 12, 2006. AGENDA. Welcome / Introductions Recap Current Studies Revisions in Version 2 Issues Raised To Date NPS Watershed Plans (OCC) Questions Comments.

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slide1

North Canadian RiverOklahoma RiverShell CreekDraft TMDLs For Bacteria

2nd PUBLIC MEETING

September 12, 2006

slide2

AGENDA

  • Welcome / Introductions
  • Recap Current Studies
  • Revisions in Version 2
  • Issues Raised To Date
  • NPS Watershed Plans (OCC)
  • Questions
  • Comments
review current studies
Review Current Studies
  • North Canadian River: Canton Dam to Yukon, including Shell Creek
    • Prepared by Parsons
    • And DEQ
  • North Canadian River & Oklahoma River:
  • Yukon to Dale
    • Prepared by ACOG
  • Presented by Paul Yue
slide5

Upstream of OKC discharge

HW 81

Yukon

NC06

XXX Rd

NC01

NC02

NC05

NC04

NC07

Shell Crk

NC03

Dale

NC08

Lake Overholser

Del City

Midwest City

monitoring data
Monitoring Data
  • If more than 10% of data above the standards  Problem
  • North Canadian River (NC01)

FC – 33% exceed

E-Coli – 13% exceed

Enterococci – 94% exceed

north canadian river
North Canadian River
  • Enterococci - 89%Reduction
shell creek
Shell Creek
  • Fecal Coliform - 92% Reduction
slide11

North Canadian River & Oklahoma River:

  • Yukon to Dale
    • Prepared byACOG
north canadian river acog
North Canadian River (ACOG)

EL RENO STATION ENTEROCOCCI

REDUCTION GOAL: 95.6%

slide14

Proposed Revisions

In Version 2

slide15

What Is Necessary To Comply With The TMDL ?

Clarifications added

Demonstrate progress toward meeting the reduction goals

Demonstrate progress toward attainment of water quality standards

slide16

Do Stormwater Dischargers Have To Produce The Entire Reduction Required By The TMDL ?

“Permitted MS4 stormwater discharges are considered point sources. Since these sources are associated with wet weather events, they are assigned the same pathogen reduction goals as the nonpoint source load allocations. These reduction goals apply only to the pathogen contribution from within the MS4. Permitted stormwater dischargers are not expected or

required to produce the entire pathogen loading reduction specified in this TMDL. ”

slide17

Are Current Water Quality Standards Appropriate ?

“The suitability of the current criteria for pathogens and the beneficial uses of the receiving stream should be reviewed.”

slide18

Are Current Water Quality Standards Appropriate ?

  • 3 Approaches To WQS Revisions
    • Remove The Use
      • Requires a Use Attainability Analysis
      • Existing Uses Cannot Be Removed
slide19

Are Current Water Quality Standards Appropriate ?

  • 3 Approaches To WQS Revisions
    • Modify Application Of The Criteria
      • Exemption For High Flows
      • Allowance For “Natural” Conditions
      • Establish A Subcategory Of The Use
      • Special Provision For Urban Areas
slide20

Are Current Water Quality Standards Appropriate ?

  • 3 Approaches To WQS Revisions
    • Revise The Numeric Criteria
      • Remove Indicator(s)
      • Change The Numeric Values
      • Risk-Based Approaches
slide21

Are Current Water Quality Standards Appropriate ?

“Unless or until the water quality standards are revised and approved by EPA, Federal rules require that this TMDL must be based on attainment of the current standards. If revisions to the pathogen standards are approved in the future, the reductions specified in this TMDL will be re-evaluated.”

slide22

Appendix F

Stormwater Permit Provisions

  • Yukon
  • Mustang
  • Bethany
  • Warr Acres
  • Moore
  • Del City
  • Midwest City
  • Oklahoma City
  • Spencer
  • Nicoma Park
  • Choctaw
  • ODOT
  • OTA
  • Tinker AFB
slide23

Appendix F

Stormwater Permit Provisions

  • OKR04 Requirements
  • Ensure that discharges that would cause or contribute to any water quality standards exceedance will not occur
  • Discharge of a pollutant into any water for which a Total Maximum Daily Load (TMDL) for that pollutant has been either established or approved by the DEQ or EPA is prohibited, unless your discharge is consistent with that TMDL
slide24

Appendix F

Stormwater Permit Provisions

“Compliance with the following provisions will constitute

compliance with the requirements of this TMDL”.

  • Develop A Bacteria Reduction Plan
  • Develop Or Participate In A Bacteria Monitoring Program
  • Annual Reporting
slide25

Appendix F

Stormwater Permit Provisions

  • Develop A Bacteria Reduction Plan
  • Consider ordinances or other regulatory mechanisms
  • Evaluate the existing SWMP
  • Educational programs
  • Implement BMPs
  • Modifications to the dry weather field screening and
  • illicit discharge detection and elimination program
  • Periodic evaluation of effectiveness
  • Ensure progress toward attainment of water quality
  • standards.
  • Implementation schedule (2 years)
slide26

Appendix F

Stormwater Permit Provisions

2. Develop Or Participate In A Bacteria Monitoring Program

  • Establish the effectiveness of the selected BMPs
  • Demonstrate progress toward the reduction goals
  • TMDL monitoring schedule or commitment to
  • participate in regional program (18 months)
  • Implemented within 2 years
slide27

Appendix F

Stormwater Permit Provisions

3. Annual Reporting

  • Include a TMDL implementation report in the
  • annual report.
  • Status and actions taken to implement the TMDL
slide28

Appendix F

CAFO Permit Provisions

  • These NPDES permits are issued by EPA
  • CAFO permits in the watershed and their
  • management plans must be reviewed
  • Further actions necessary to reduce bacteria loads
  • and achieve progress toward meeting the reduction
  • goals must be implemented
  • Forward to EPA for follow up
applicability of the load duration curve model
Applicability Of TheLoad Duration Curve Model
  • Load Duration Curve (LDC) Method is approved by EPA
  • LDC – a proven method for TMDL development
applicability of the load duration curve model1
Applicability Of TheLoad Duration Curve Model
  • LDC – used by many states (AR, LA, TX, KS, MO, CA, OH, TN, NC, ND, WI, VA, OR, NJ, IN, …)
  • And EPA
slide36

Geometric Mean

vs

Maximum Values

Fecal Coliform

Impaired = Violate EITHER Test

Not Impaired = Pass BOTH Tests

E. Coli. And Enterococci

Impaired = Violate BOTH Tests

Not Impaired = Pass EITHER Test

For Impairment determination, use 2-year geometric mean

Not 30-day geometric mean (OAC 785:46-15)

bacterial source tracking bst

BST is considered by the experts to still have great uncertainty.

  • “In all, fewer than 30%percent of challenge isolates were classified to the correct source-animal species by any method” – USGS Reporthttp://wv.usgs.gov/press.html

Bacterial Source Tracking (BST)

bst examples

Turkey Creek Watershed, OK (2003) by USGS (43% isolates unidentified)

BST Examples

  • Four Mile Run – Northern Virginia (49% isolates unidentified)
north canadian river acog1
North Canadian River (ACOG)

EL RENO STATION ENTEROCOCCI

REDUCTION GOAL: 95.6%

reduction rates acog report1
REDUCTION RATES ** (ACOG Report)

** Re-calculated reduction rates

nonpoint sources

Nonpoint Sources

What Programs Are Available?

What Are The Plans For

The North Canadian River?

Greg Kloxin

Oklahoma Conservation Commission

what happens next

What Happens Next ?

  • Comments Accepted Through October 12
  • Comment Responsiveness Summary
  • Final Draft Submitted For EPA Approval
  • Incorporate In Water Quality
  • Management Plan
how to provide comments

 Oral Comments Accepted This Evening

By Mail:

Dr. Karen Miles

Water Quality Division

Oklahoma Department of Environmental Quality

P.O. Box 1677

Oklahoma City, OK 73101-1677

By Email:

Karen.Miles@deq.state.ok.us

How To Provide Comments

Comments Must Be Received By

October 12 !