### UNITED STATES ENVIRONMENTAL PRO T ECTION AGENCY

WASHINGTO N

, D

. C

. 20460

O FF IC E O F C HEMI CA L SA F E TY

A ND P O LL U TION P R E V ENT I O N



### MEMORANDUM

DATE:

SUBJECT:

FROM:

TO: September 28,2011

Transmittal memo for the FIFRA Scientific Advisory Panel Consultation on the

Two-dime n sional Exposure Rainfall

- Runoff Assessment (TERRA) Watershed

Model and Its Use in the FIFRA Ecological Risk Assessment for Antimicrobia l

Uses of Copper

Joan Harrigan

- Farrelly, Director

Antimicrobials Division (7510P)

And

Donald Brady, Ph.D., Director

# ~ Environmental Fate and Effects 

# ElfvI

Fred Jenkins, Ph.D.

Designated Federal Official

FIFRASAP

Office of Science Coordination and Policy (7201 M)

This memo transmits documents compiled or developed by EPA in preparation for the October

25

- 26,2011 meeting of the FIFRA Scientific Advisory Panel (SAP) on the Two

- dimensional

Exposure Rainfall-Runoff Assessment (TERRA) l Watershed Model and Its Use in the FIFRA

Ecological Risk Assessment for Antimicrobial Uses of Copper. The American Chemistry

Council (ACC) submitted an aquatic exposure assessment for antimicrobial uses of copper using

the TERRA model, which is also being transmitted. ACC's aquatic exposure assessment is

uniq u e because it was conducted on a watershed scale using a new model (TERRA). The Office

I P l ease note that the name of the model under review was recen t ly changed from Two-dimensional Runoff

, Erosion, and Export (TREX) to Two-dimensiona l Exposure and Rainfall-Runoff Analysis (TERRA). This name

change was made to avoid confusion with the Terrestrial Residue Exposure (T-REX) model that OPP uses to

estimate pesticide concentrations for avian and mammalian food items (Uni t ed States Environmental Protection

Agency. 2008. Terrestrial Residue Exposure Model Version 1.4.1. www.epa.gov / oppefedlimodels / terrestriaVtrex).

### of Pesticide Programs (OPP) is seeking consul tation from the SAP on the TERRA model and the

appropriateness of its use in future FIFRA ecologi cal risk assessments for antimicrobial uses of

copper.

OPP is submitting a large amount of background ma terials for SAP Panel member consideration,

including the files necessary to run to the TERRA model. Several documents being submitted to

the SAP were developed by ACC and Hydroqual In c. or are from the open literature. The

background materials will be availabl e (1) in docket EPA-HQ-OPP-2011-0582 at

regulations.gov, (2) in the genera l literature to the public or (3 ) provided electronically in PDF

format to Panel members. Literature articles cannot be posted to the docket due to copyright

restrictions. A summary of the materials bei ng submitted to the panel for consideration and

where these documents can be located is provided in Tables 1 and 2 below.Table 1. Background Material for October 25-26, 2011 Scientific Advisory Panel Meeting on the TERRA ModelMaterial TransmittedFile NameFIFRA 10(g)or ©ProtectedAvailabilityEPA-HQOPP2011-0582DVD toPanelMembersOtherCharge Questions to the SAPTERRA SAP Charge QuestionsFinal 9.28.11.pdfNo• •EPA Background DocumentTERRA SAP EPA BackgroundDocument FINAL 9.28.11.pdfNo• •HydroQual Inc. forAmerican ChemistryCouncil Background DocumentVelleux-et-al-Antimicrobial-CuSummary-27September2011.pdfNo• •Copper Transport and Fate Simulationsand Evaluation of EstimatedEnvironmental Concentrations forCopper-Based AntimicrobialCompoundsCu Transport_Fate SimulationFinal Rpt 122109.pdfNo• •TERRA Model Set-Up InstructionsTERRA_TREX -Training-Guide-CompileCode-RunModel.pdfNo• •http://www.engr.colostate.edu/~pierre/ce_old/Projects/TREX%20Web%20Pages/TREX-Home.htmlTERRA Source CodeFiles included in the“TERRA_TREX-Source-CodeFolder”No•http://www.engr.colostate.edu/~pierre/ce_old/Projects/TREX%20Web%20Pages/TREX-Home.htmlTERRA Example SimulationsFiles included in the“TERRA_TREX-ExampleSimulations Folder”No•http://www.engr.colostate.edu/~pierre/ce_old/Projects/TREX%20Web%20Pages/TREX-Home.htmlTERRA Watershed ModelingFramework User’s ManualTERRA_TREX-User-Manual-10-Jan-2011.pdfNo• •http://www.engr.colostate.edu/~pierre/ce_old/Projects/TREX%20Web%20Pages/TREX-Home.htmlLiterature Review: Comparison ofCommon Watershed Models forRainfall, Runoff Sediment Transport,and Contaminant Transport and FateWatershed-Modeling-LiteratureReview.pdfNo••Table 2. Background Literature for October 25-26, 2011 Scientific Advisory Panel Meeting on the TERRA ModelJournal ArticleCitationFIFRA10(g) or ©ProtectedAvailabilityEPA-HQOPP-2011-0582To PanelMembersRaster-Based Hydrologic Modeling of SpatiallyVaried Surface RunoffJulian, P.Y., B. Saghafian, and F. L. Ogden. 1995. Water ResourceBulletin. 31:523-536.Yes•*The Two-Dimensional Upland Erosion ModelCASC2D-SEDJohnson, B.E., P.Y. Julian, D.K. Molnar, and C. C. Watson. 2000.Journal of the American Water Resources Association. 36: 31-42.Yes•*Peak Flow Forecasting with Radar Precipitationand the Distributed Model CASC2DJorgeson, J., and P. Julien. 2005. International Water ResourcesAssociation Water International, 30(1): 40-49.Yes•*Simulation of Metals Transport and Toxicity at aMine-Impacted Watershed: California Gulch,ColoradoVelleux, M., P.Y. Julien, R. Rojas-Sanchez, W.H. Clements, and J.England, J. 2006. Environmental Science and Technology,40(22):6996-7004.Yes•*Two-Dimensional Simulations of ExtremeFloods on a Large WatershedEngland, J., M. Velleux, and P. Julien. 2007. Journal ofHydrology, 347(1):229-241.Yes•*Grid Scale Effects on Watershed Soil ErosionModelsRojas, R., M. Velleux, P.Y. Julian, and B. E. Johnson. 2008.Journal of Hydrologic Engineering. 13:9 793-802.Yes•*TREX: Spatially distributed model to assesswatershed contaminate transport and fateVelleux, M., J. England, and P. Julien. 2008. Science of the TotalEnvironment, 404(1):113-128.Yes•*Comparison of Green-Ampt and Curve NumberMethods on Goodwin Creek Watershed UsingSWATKing, K.W., J.G. Arnold, and R.L. Bingner. 1999. Transactions ofthe American Society ofAgricultural Engineers 42(4): 919-925. Yes•*Metals fate and transport modeling in streamsand watersheds: state of the science and USEPAworkshop reviewCarsuso, B.S., T.J. Cox, R.L Runkel, M.L. Velleux, K.E. Bencala,D.K. Nordstorm, P.Y. Julian, B.A. Butler, C.N. Alpers, A. Marion,and K.S. Smith. 2008. Hydrological Processes. 22:4011-4021Yes•*The Biotic Ligand Model: A HistoricalOverviewPaquin, P.R., J.W. Gorsuch, S. Apte, G.E. Batley, K.L. Bowles,P.G.C. Campbell, C.G. Delos, D.M. Di Toro, R.L. Dwyers, F.Galvez, R. W. Gensemer, G.G. Gross, C. Hogstand, C.R. Janssen,J.C. McGeer, R.B. Naddy, R.C. Playle, R.C. Santone, U. Schnider,W.A. Stubblefield, C.M. Wood, and K.B. Wu. 2002. ComparativeBiochemistry and Physiology. Part C 133: 3-35.Yes•**At this time the Agency does not have copyright permission to disseminate these journal articles to the Panel members. Uponreceipt of copyright permission,the Agency will distribute the journal articles to the Panel.