James Nusrala

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James Nusrala

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Whole Effluent Toxicity. Documentation. Toxics RPA IMD: Why & How ... Whole Effluent Toxicity. Reasonable Potential Analysis. Effluent Characterization- Ch.5 ... – PowerPoint PPT presentation

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Title: James Nusrala

1
Oregon Municipal Permitting IssuesACWA Workshop
December 1, 2005
Reasonable Potential Analysis for Toxic
Pollutants Internal Management Directive
James Nusrala Marty Fitzpatrick Oregon
Department of Environmental Quality, Water
Quality Division
2
Overview

Topics covered
Why, How, and Whos Affected
The Process
Implications of IMD
Q A

3
Topics Covered in RPA IMD

Information Gathering
NPDES Application Review
Antidegradation
Receiving Water/Effluent Characterization
Calculations
RPA/Limits for Toxic Pollutants
Whole Effluent Toxicity
Documentation

4
Toxics RPA IMD Why How

Revised Toxics rules (incl. criteria) May 2004
RPA IMD development
Drafts (internal/external review)
Training
Authorization in September 2005

5
Which Point Sources are Affected

Domestic Facilities
Average Dry Weather Design Flow gt 1 million
gallons per day (MGD) All toxic pollutants
Design flow greater than 0.1 MGD, but less than 1
MGD Chlorine and Ammonia

6
Which Point Sources are Affected

Industrial Facilities with Toxic Monitoring
Requirements
Primary Industries Metals required for all,
organic fractions by industrial category
Secondary Industries At discretion of permit
writer, considering potential for toxic impacts
to receiving water

7
Two Questions Being Asked of Point Sources

When will a limit be needed for a toxic
pollutant? (when will there be reasonable
potential?)
If a limit is needed, what should that limit be?

8
Key Features

Reasonable Potential Analysis for Toxics-Numeric
Criteria
Calculating Effluent Limitations for Toxics
Numeric Criteria
Whole Effluent Toxicity

Reasonable Potential Analysis

10
Effluent Characterization- Ch.5

RPA Methodology ? 1991 U.S. EPA TSD
Minimum data requirements
Effluent toxics data
Background toxics data
Dilution information

11
Data Requirements - Domestics
12
Permit Renewal Application Meet Minimum
Requirements?

If sufficient data
Conduct RPA
If insufficient data
Reject application, or
Reissue permit, with a compliance schedule for
monitoring and re-opener clause to perform RPA

Effluent Limit Calculation

14
Limit Development Ch. 6

WQBEL methodology ? 1991 EPA TSD
Decision matrix ? most stringent limit
Compliance schedule provision

Whole Effluent Toxicity

16
Whole Effluent Toxicity Characterization Ch. 7

Who? All domestic sources with a dry weather
design flow gt 1 MGD
How Much? Minimum of 4 WET tests of 3 species
for both acute and chronic endpoints 10
Recommended for larger sources

17
Whole Effluent Toxicity Evaluation

Insufficient data? Reissue permit with
compliance schedule
Sufficient data?
IF WET test no toxicity no limits, yearly
monitoring
If WET test toxicity increased frequency of
testing, possible Toxicity Identification/Reductio
n Evaluation

18
Implications Increased Monitoring

Required to adequately characterize
effluent/receiving water environment
Costs spread throughout life of permit
Frequency decreases if non-detect
Advance notice will be given for planning/budget
allocation

19
Implications Potential for Additional Effluent
Limits

Toxic pollutant limits if reasonable potential to
exceed instream toxics criteria
Interim limits/compliance schedules a possibility
Need to re-evaluate pretreatment local limits
with lower criteria

20
Anticipated Means to Comply