### MEMORANDUM

TO: Steam Electric ELG Rulemaking Record

FROM: Lydia Lambert, ERG

DATE: April 19, 2013

SUBJECT: Supporting Documentation for Summariza tion of Environmental Assessment (EA) Analyses (DCN SE03892)

1.0 S UMMARY OF S UPPORTING D OCUMENTATION
ERG is providing technical support to the U. S. Environmental Protection Agency (EPA) for development of revised effluent limitations guidelines and standards (ELGs) for the Steam Electric Power Generating Point Source Category. In support of the development of revised ELGs, ERG developed resources to summarize results of the following Environmental Assessment (EA) analyses:

 Quantitative assessment of water quality impacts and potential impacts to wildlife and human receptors; and

 Literature review, including documentati on of environmental impacts from steam electric wastewater discharges and summary of damage cases.

1.1 Quantitative Assessment

The quantitative analyses are summarized by utilizing raw data files generated from resources documented in the following memoranda:

 Pollutant Loadings Supporting Documentation Memorandum (DCN SE03887) – This memorandum identifies the supporting documen tation used to calculate the pollutant loadings evaluated in the water quality model.

 Water Quality Model Supporting Documentation Memorandum (DCN SE03888) – This memorandum identifies the supporting do cumentation used to calculate pollutant concentrations in the water column and se diment of the immediate receiving water and evaluate the impacts that receiving water concentrations pose to aquatic life and human health.

 Wildlife and Human Health Models Supporting Documentation Memorandum (DCN SE03889) – This memorandum identifies th e supporting documentation used to calculate pollutant concentra tions in exposed fish populati ons, evaluate the potentialMemorandum April 19, 2013 Page 2

adverse effects to minks and eagles from th e consumption of fis h, and calculate noncancer and cancer risks to human populations from the consumption of fish.

The summary results of the quantitative anal yses under the current profile are presented in the Preamble and the following sections of the Final Environmental Assessment for the Proposed Effluent Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category (EA Report) (DCN SE01995):

 Section 3.4 (Discharge to Sensitive Environments);

 Section 4.1.1 (Factors Controlling Envir onmental Impacts in Surface Waters);

 Section 6.2 (Key Environmental Improvements);

 Section 6.3 (Pollutant-Specific Improvements); and

 Section 6.4 (Improvements to Sensitiv e Environments and Watersheds).

A comprehensive listing of the quantitat ive summary documentation for the current profile is presented in Table 1- 1 below. This table provides the document control number (DCN), title, and abstract of each record item, and id entifies whether the record item contains Confidential Business Information (CBI).

Table 1-1. Quantitative Summary Record Items

DCN Title Abstract CBI a

SE03551 Preamble Data Calculations Database (082812) Database used to calculate a portion of the data presented in the Environmental Assessment Section of the Preamble. Yes

SE03552 EA Report Calculations Database (083012) Database used to calculate a portion of the data presented in the Final Environmental Assessment for the Proposed Effluent Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category Report. Yes

SE03553 General Environmental Improvements - Current Profile (082812) Spreadsheet that summarizes the general results from the Water Quality Model, Wildlife Model, and Human Health Model for baseline and options under the current profile. No

SE03554 Pollutant Environmental Improvements - Current Profile (082812) Spreadsheet that summarizes the results for a specific pollutant from the Water Quality Model, Wildlife Model, and Human Health Model for baseline and options under the current profile. No

a – Record items containing CBI have been removed from the public record.

1.2 Literature Review

The methodology of the literatur e review is presented in Ap pendix A (Literature Review Methodology and Results) of the EA Report. The summary results of the literature review are presented in the following sections of the EA Report:

 Section 5.3.1 (Water Quality Impacts);

 Section 6.2 (Key Environmental Improvements);

 Section 6.3 (Pollutant-Specific Improvements); andMemorandum April 19, 2013 Page 3

 Section 7 (Conclusions).

A comprehensive listing of the literature re view summary documentation is presented in Table 1-2 below.

Table 1-2. Literature Revi ew Summary Record Items

DCN Title Abstract CBI a
SE01966 Final Determination of Identified Proven Damage and Recently Alleged Damage Cases Spreadsheet contains a full listing of the identified damage cases and EPA's designation (i.e., proven, potential, or rejected) as of September 18, 2012. Note that this file doesn't address the 19 damage cases identified in the EIP's December 2011 Report (Risky Bu siness: Coal Ash Threatens America’s Groundwater Resources at 19 More Sites). These alleged damage cases have not been reviewed or confirmed by EPA. No

SE02156 Impact Case Study Analysis Database Database that contains a full listing of the potential and proven damage cases according to EPA's determination provided on September 18, 2012 and impact case studies identified in literature. Also c ontains queries that generate the counts and listings presented in Appendix A (Literature Review Methodology and Results) of the Final Environmental Assessment for the Proposed Effluent Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category Report. No

SE01962 Literature Search Database Database th at contains a full listing of the resources EPA collected and/or reviewed over the course of the Environmental Assessment analysis. Also contains queries that generate the counts and listings presented in Appendix A (Literature Review Methodology and Results) and Section 3.5 (Documented Environmental Impacts) of the Final Environmental Assessment for the Proposed Effluent Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category Report. No

a – Record items containing CBI have been removed from the public record.