Water Quality Assessment Process Summary for EMC Approval

The request seeks EMC approval for the 2014 303(d) listing methodology by Kathy Stecker. The process involves conducting reviews, public comments, and submitting lists for EPA approval. It includes assessment categories, response to comments, statistical confidence, and criteria exceedance. Changes from 2012 include fish tissue data updates and site-specific advisories. Categories 4 and 5 require statistical confidence, while Category 1 has fewer criteria exceedances.

• Water Quality
• Assessment Process
• EMC Approval
• 303(d) Listing
• Kathy Stecker

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1. REQUEST PERMISSION TO PROCEED TO EMC FOR APPROVAL OF 2014 303(D) LISTING METHODOLOGY Kathy Stecker

2. Schedule 2 March 13-14 303(d) Listing Methods to WQC/ EMC for approval DWQ applies methods, conducts review Jan. Feb. 2014 Public review of 303(d) List March EMC info item on results April 1 Submit List to EPA for approval May-June Public comment on 2016 listing methods

3. Status 3 Documents 2014 303(d) Listing Methodology 2014 Assessment Process Comments and Responses 2014 Water Quality Assessment Process A. B. C. DWQ meeting with commenters February 18, 2013

4. 2014 Assessment Process Comments and Responses 303(d) listing methods Single benthos or fish community results Shellfish harvesting classifications Fish consumption listings Quantify statistical confidence More information requested Rationale for each listing Natural conditions All assessment categories Data acceptability De-listing process 1. 2. 3. 4. 1. 2. 3. 4. 5.

5. 2014 Water Quality Assessment Process Comprehensive, transparent, understandable description of entire assessment process De-listing Data submittal Assessment units Categories 1-5

6. 1 Meeting criteria 2 3 No info/inconclusive 4 Criteria exceeded 5 303(d) List

7. 2014 Water Quality Assessment Process Changes from 2012 Fish tissue data Category 5 = site-specific fish consumption advisories developed using fish tissue data Develop guidance for moving waters from Category 4t to Category 1t for mercury, consistent with EPA guidance 90% statistical confidence for Categories 4 and 5 For certain numeric criteria With 10% exceedance allowance

8. 2014 Water Quality Assessment Process Categories 4 and 5 Greater than 10% of samples exceed criteria, with greater than or equal to 90% statistical confidence Category 3 Greater than or equal to 10% of samples exceed criteria, with less than 90% statistical confidence Category 1 Less than 10% of samples exceed criteria

9. Example Turbidity Assessment (2012 Data Set) Estimated Number of Locations Old Method 877 55 118 Category 1 3 4+5 New Method 877 117 56

10. 2014 303(d) Listing Methodology Changes Fish tissue data 90% statistical confidence for listing

11. REQUEST PERMISSION TO PROCEED TO EMC FOR APPROVAL OF 2014 303(D) LISTING METHODOLOGY