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OKLAHOMA WATER QUALITY STANDARDS
2018 TRIENNIAL RULEMAKING
Oklahoma Water Resources Board
1st
Public Stakeholder Meeting
March 1, 2018
Today’s Meeting
Discuss Triennial Process
Actions planned for the Upcoming Triennial
Rulemaking
Selenium Ambient Aquatic Life Criterion
Human Health Criteria Updates
Dissolved Oxygen Assessment Implementation
Other Updates
Opportunity for Public Solicitation of Revision
Topics
Triennial Review
Previous Triennial Review
Triennial Review
Rulemaking Phase
Current Rulemaking
Interim Rulemaking
Planning Phase
Future Triennial Reviews
Review of Standards – Federal Requirement
Federal Clean Water Act Section 303(c)(1)
Review water quality standards every three years (40 CFR 131.20)
Modify or adopt standards, where appropriate
New scientific information
EPA recommendations or guidelines
Consideration of public concerns
Provide explanation for non-adoption
Review of Standards – State Process
Authority under Title 82 (1085.2) of the Oklahoma Statutes
Consider new 304(a) criteria
Review Appendix A to determine if waterbody classes or designations need revised or new waterbodies need listed
Review Appendix B to add or delete Public Areas requiring protection (e.g., new WMA’s or state parks)
Review and update implementation requirements
Identify and correct scrivener errors
Triennial Review Planning Process
STEP 2 Prioritize
Issues to be
Addressed
STEP 3 Develop &
Adopt Individual
Amendments
STEP 1 Review
Standards & Identify Issues
2018-2021 Triennial Review Planning
Step 1 - Identify standards related issues (Throughout 2018)
Internal review & stakeholder solicitation
Step 2 - Prioritization/selection of projects (Early 2019)
Step 3 - Develop individual Amendments over ~ 3 year period
Future Potential Projects
Recreational Criteria for Bacteria and Algal Toxins
Ammonia Aquatic Life Criteria
Minerals Criteria Revision
Reformat Appendix A (greater functionality)
Lake Chlorophyll and Nutrients
Review Appendix E Process
Variance Process
Lake Mixing Zone Policy
All projects expected to have technical workgroup
& stakeholder participation
Selenium
How does it enter the environment?
Naturally occurring mineral Enters the environment through weathering
Various anthropogenic pathways surface mining, irrigated agriculture, point sources
How Does It Affect Aquatic Life?
Essential nutrient in small amounts
Toxic at higher concentrations
Bioaccumulates through the food chain
Chronic exposure causes:
Reproductive impairments
Adverse affects to growth
Juvenile Mortality
Current Criteria
• Acute and Chronic
• Water-Based
New Criteria
• Chronic
• Hierarchical
Implementation
• Tissue Collection
• Permitting
• Assessments
https://www.epa.gov/sites/production/files/201606/documents/se_2016_fact_sheet_final.pdf
HUMAN HEALTH CRITERIA
WHAT ARE HUMAN HEALTH CRITERIA?
• A Human Health Criterion (HHC) is the highest concentration
of pollutant that is not expected to pose a significant risk to
human health
• Provide protection from two routes of exposure
– Consumption of aquatic organisms
– Consumption of aquatic organisms + water
• Oklahoma HHC applicability
– Public and private water supply beneficial use
– Fish consumption beneficial use
• all OK waters except designated Habitat Limited Aquatic Communities
NATIONALLY RECOMMENDED 304(A) CRITERIA
• CWA section 304(a) requires EPA to develop and update
water quality criteria reflecting latest scientific knowledge
• 158 Human Health and Aquatic Life Criteria
– Derived through risk based assessments
– Based solely on data and science of pollutant-effect relationship,
not economics or technological feasibility
• In 2015, EPA updated 94 HHC
– Recalculated with recent exposure and toxicity data
OKLAHOMA’S HUMAN HEALTH CRITERIA
• Chapter 45 - Oklahoma’s Water Quality Standards (OWQS)
• 37 numerical criteria for inorganic and organic pollutants
• 14 raw water values (legacy MCL’s)
• 2012 update
– 20 recalculated; 5 new
Appendix G, Table 2. Numerical Criteria to Protect Beneficial Uses and All Subcategories Thereof
HUMAN HEALTH CRITERIA TIMELINE 1980 Human Health Methodology
1986 Gold Book
1991 OWRB HHC Development for Water & Fish Consumption protection
1992 National Toxics Rule
1994 OWRB WQS Revision-Modification of Numerical Criteria Rationale
2000 Human Health Methodology*
2002 Human Health Criteria Calculation Matrix
2002, 2003, and 2009 Human Health Criteria Recommendations
2010-2011 OWRB WQS Revision-Acrolein & Phenol
2012 OWRB WQS Revision- Updated 20 HHC to be consistent with EPA’s 2000
Methodology and early 2000’s calculation inputs; added 5 new HHC
2015 Updated Ambient Water Quality Criteria for the Protection of Human Health
WHY UPDATE OKLAHOMA’S HHC?
• States are required to review
and consider nationally
recommended 304(a) criteria
• Criteria should reflect the most
recent, scientifically sound
information and methodology
• Protect the health of
Oklahomans
DATA NEEDS FOR HHC CALCULATION • Toxicity Values
– Non-carcinogens
– Carcinogens
• Risk Level
– EPA (10-6); OK (10-5)
• Exposure Inputs
– Fish Consumption Rate (FCR)
• 17.5 g/Day to 22 g/Day
– Drinking Water Intake (DI)
• 2.0 L/Day to 2.4 L/Day
– Body Weight (BW)
• 70kg to 80 kg (176.4 lbs)
– Relative source contribution factor (RSC)
• accounts for non-water sources
• Bioaccumulation factor (BAF) or Bioconcentration (BCF)
HOW DO YOU CALCULATE HHC?
Carcinogen Equation
TRIENNIAL REVISION- HHC UPDATE PRIORITIES
• Current OK HHC
– 37 update or remove
– 14 raw water
• Consider new HHC/Scoping process
– No OK HHC for 74/94 updated 304(a)
HHC
– Are these pollutants being measured,
discharged, or have the potential to?
What about in the past???
– TRI, DMR, Water Quality Portal
– Industry potential
NEXT STEPS…..
• Continue the data review and
scoping process
• Discuss in more detail at next
stakeholder meeting in June
• Provide information and receive
feedback throughout the criteria
development process.
• Ideas to use communication tools
in addition to stakeholder
meetings
Oklahoma Water Resources Board
Public Stakeholder Meeting
March 1, 2018
Dissolved Oxygen Data Assessment
Dissolved Oxygen Criteria
Protects Fish & Wildlife Propagation beneficial use
Criteria Location
Text: 785:45-5-12(f)(1)(C)
Table 1, Appendix G
OK has several DO criteria - let’s talk through them
Dissolved Oxygen Criteria
Streams
no more than 2 samples < 2mg/L annually
Lakes
Volumetric data: no more than 50% water
volume < 2 mg/L
No volumetric data: no more than 70% water
column, at any site, < 2 mg/L
SUBCATEGORY OF FISH AND WILDLIFE PROPAGATION
DATES APPLICABLE
D.O. CRITERIA4
(MINIMUM) (mg/L)
SEASONAL TEMPERATURE
(oC)
Habitat Limited Aquatic Community Early Life Stages 4/1 - 6/15 4.0 253
Other Life Stages Summer Conditions 6/16 - 10/15 3.0 32 Winter Conditions 10/16 - 3/31 3.0 18
Warm Water Aquatic Community5 Early Life Stages 4/1 - 6/15 6.02 253 Other Life Stages
Summer Conditions 6/16 - 10/15 5.02 32 Winter Conditions 10/16 - 3/31 5.0 18
Cool Water Aquatic Community & Trout
Early Life Stages 3/1 - 5/31 7.02 22 Other Life Stages
Summer Conditions 6/1 - 10/15 6.02 29 Winter Conditions 10/16 - 2/28 6.0 18
2: Because of natural diurnal dissolved oxygen fluctuation, a 1.0 mg/l dissolved
oxygen concentration deficit shall be allowed for not more than eight (8) hours
during any twenty-four (24) hour period.
4: DO shall not exhibit concentrations less than the criteria magnitudes
expressed above in greater than 10% of the samples as assessed across all life
stages and seasons.
Dissolved Oxygen Assessment
Support beneficial use: 10% or less samples
below criteria
Impaired beneficial use: > 10% samples below
lower threshold
Undetermined: > 10% below upper threshold &
10% or less samples below lower thresholds
Chapter 46, Subchapter 15, Use Support Assessment Protocols
Different DO Data Sets Routine Monitoring
8 sampling events/year over 5 years = 40 samples
10% = 4
Continuous Monitoring
15 min measurements, subsampled to 1 hour,
over 5 years = 43,800 samples
10% = 4,380
These are really different data sets
and warrant different evaluation
Different DO Data Sets: Example
Monthly sampling 1 year
12 samples
1 sample below criteria
<10 % below criteria = supporting beneficial use
Continuous sampling 1 year
365 daily samples
36 daily samples below criteria
<10% below criteria = supporting beneficial use
Create workgroup
Scope & discuss challenges
Consider various assessment options & approaches
Provide input to OWRB staff
OWRB staff draft revisions to DO assessment
procedure for rulemaking
Next Steps
Public Participation Engage stakeholders in planning & rulemaking
Provide public information
Actively solicit feedback
Plan projects & consider workload
Tools
Stakeholder meetings
Technical workgroups
Project updates via email
Individual communications
Questions / Open Discussion Contact Information
Monty Porter
Phone: 405-530-8933
Rebecca Veiga Nascimento
Phone: 405-530-8952
Jade Jones
Phone: 405-530-8934
