### MEMORANDUM

TO: Steam Electric ELG Rulemaking Record

FROM: Lydia Lambert, ERG

DATE: April 19, 2013

SUBJECT: Fish Tissue Comparison Supporting Documentation (DCN SE03890)

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 a fish tissue comparison database to compare modeled selenium concentrations in fish tissue under the current profile 1 for the baseline and five regulatory options (Options 1, 2, 3, 4, and 5) to concentrations documented in literature as causing reduced reproductive success and histopath ological effects in fish.

The modeled selenium concentrations in fish tissue were calculated under the current profile and future profile using the wildlife model supporting documentation, which is presented in more detail in the Wildlife and Human Health Models Supporting Documentation Memorandum (DCN SE03889).

ERG did not calculate selenium concentrations in the fish tiss ue for Options 3a, 3b, or 4a using the wildlife supporting documentation desc ribed above. The methodology used for these three regulatory options is pr esented in Appendix G (Methodol ogy for Non-Modeled Options) of the Final Environmental Assessment for the Propo sed Effluent Limitations Guidelines and Standards for the Steam Electric Powe r Generating Point Source Category (EA Report) (DCN SE01995)

. The results of the fish tissue comparison data base under the current profile are presented in the following sections of the EA Report:

 Section 5.3.2 (Wildlife Impacts); and

 Section 6.3 (Pollutant-Specific Improvements).

A comprehensive listing of the fish ti ssue comparison supporting 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 identifies wh ether the record item contains

1 Current profile includes waste streams generated by air po llution controls that will likely be in operation at steam electric plants at the time EPA takes final action on this rulemaking.Memorandum April 19, 2013 Page 2

Confidential Business Information (CBI). ERG did not compare modeled fish tissue concentrations to literature for the future profile 2

. Table 1-1. Current Profile Fish Tissue Comparison Record Items

DCN Title (Date) Abstract CBI a SE03522 Fish Tissue Comparisons Database - Current Profile - Baseline (082712) Database used to compare fish tissue concentrations documented in literature to fish tissue concentrations calculated in the Wildlife and Human Health Models under baseline current profile. Generates inputs for Wildlife Model Summary Tables Database and Human Health Model Summary Tables Database. Yes

SE03523 Fish Tissue Comparisons Database - Current Profile - Option 1 (082712) Database used to compare fish tissue concentrations documented in literature to fish tissue concentrations calculated in the Wildlife and Human Health Models under Option 1 current profile. Generates inputs for Wildlife Model Summary Tables Database and Human Health Model Summary Tables Databases. Yes

SE03524 Fish Tissue Comparisons Database - Current Profile - Option 2 (082712) Database used to compare fish tissue concentrations documented in literature to fish tissue concentrations calculated in the Wildlife and Human Health Models under Option 2 current profile. Generates inputs for Wildlife Model Summary Tables Database and Human Health Model Summary Tables Databases. Yes

SE03525 Fish Tissue Comparisons Database - Current Profile - Option 3 (082712) Database used to compare fish tissue concentrations documented in literature to fish tissue concentrations calculated in the Wildlife and Human Health Models under Option 3 current profile. Generates inputs for Wildlife Model Summary Tables Database and Human Health Model Summary Tables Databases. Yes

SE03526 Fish Tissue Comparisons Database - Current Profile - Option 4 (082712) Database used to compare fish tissue concentrations documented in literature to fish tissue concentrations calculated in the Wildlife and Human Health Models under Option 4 current profile. Generates inputs for Wildlife Model Summary Tables Database and Human Health Model Summary Tables Databases. Yes

SE03527 Fish Tissue Comparisons Database - Current Profile - Option 5 (082712) Database used to compare fish tissue concentrations documented in literature to fish tissue concentrations calculated in the Wildlife and Human Health Models under Option 5 current profile. Generates inputs for Wildlife Model Summary Tables Database and Human Health Model Summary Tables Databases. Yes

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

2 Future profile includes waste streams generated by future installations of air pollutio n controls at steam electric power plants that may result from some recently promulgated Clean Air Act requirements.