How does epa calculate tm

US EPA. Environmental Protection Agency and are protected by copyright throughout the world. Permission is granted for individuals to download and use the software on their personal and business computers.

Users may not alter, modify, merge, adapt, distribute, or prepare derivative works from the software. Users may not remove or obscure copyright, trademark, or proprietary notices on the program or related documentation. Environmental Protection Agency. Summarize the information available on transformation products. Summarize the results of bioconcentration studies. State the amount of depuration over a specific time frame.

Indicate whether metabolites of the chemical were observed. Briefly summarize how the chemical will enter the environment, the pathways of transport and dissipation, and the relevant exposure media. State what dissipation pathways are the most important and which environmental compartments will have the highest portion of the chemical applied. Note that all chemicals may be transported via air, water runoff, and soil runoff as some of the chemical will be present in all forms.

Whether a transport pathway or media of exposure is important is determined by environmental fate properties, toxicological endpoints, environment characteristics, and the amount of chemical used. Make sure the summary is consistent with the conceptual model. Example language is provided below. Pesticide X will enter the environment via spray directly onto soil or foliage. It may move off-site via spray drift, volatilization, leaching, and runoff.

During rainfall or other precipitation events it may move off the field via water runoff, soil erosion, or leaching.

Because of its long half-lives in soil, Pesticide X does have the potential to reach surface water through run-off and soil erosion. Pesticide X is classified as [provide mobility classification]. Terrestrial field dissipation studies and Pesticide X's half-lives indicate it may accumulate in soil with successive applications. However, several published studies have shown that Pesticide X is volatile, especially from moist or wet soil Glotfelty et al.

The atmospheric degradation half-life estimated using EPI Suite was 10 days results shown in Appendix X and therefore, once it volatilizes it is likely to be transported over long distances. Accessed July 9, Armitage, J. A terrestrial food-chain bioaccumulation model for POPs. Environmental Science and Technology, 41, Arnot, J.

A review of bioconcentration factor BCF and bioaccumulation factor BAF assessments for organic chemicals in aquatic organisms. Environmental Reviews, 14, Boethling, R. Handbook of Property Estimation Methods for Chemicals. Connell, D. Chapter 3. Environmental Transformation and Degradation Processes. McCombs, A. Starkweather Jr. Boyd Eds. Appendix 2. Parameters of pesticides that influence processes in the soil. Assessing Soil Contamination. A Reference Manual.

Accessed July 10, Glotfelty, D. Volatilization of surface-applied pesticides from fallow soil. Journal of Agricultural and Food Chemistry, 32, Gobas, F. Quantitative structure activity relationships for predicting the bioaccumulation of POPs in terrestrial food-webs.

QSAR Comb. Sci, 22, Halsall, C. Environmental Organic Chemistry. Harrison Ed. Cambridge: Royal Society of Chemistry. Harner, T. Measurements of octanol-air partition coefficients K OA for polybrominated diphenyl ethers PBDEs : predicting partitioning in the environment. International Programme on Chemical Safety. Mackay, D. Physical-chemical properties and environmental fate and degradation handbook.

CRCnet Base. Majewski, M. A field comparison of two methods for measuring DCPA soil evaporation rates. Environmental Toxicology and Chemistry, 10, Meylan, W. Estimating octanol-air partition coefficients with octanol-water partition coefficients and Henry's law constants.

Chemosphere, 61 5 , Nash, R. Halogenated pesticide volatilization and dissipation from soil under controlled conditions. National Institute of Standards and Technology. Ross, L. In addition the command line code should be adjusted based your operating system. EPA Sushko, I. Model , 50, Cassano, A. Zhu, H. Benfenati, E.

Young, D. Harten, R. Venkatapathy, S. Das and D. Martin, T.