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Toxicity Evaluation - In this step, the potential adverse <br /> health effects of the contaminants of concern are identi- <br /> fied. in this report, hazard identification and toxicity <br /> evaluation have been combined. <br /> Fate and Trans ort Analysis - Fate and transport analysis <br /> identifies the pathways through which contaminants may <br /> migrate; the fates and migration rates of important com- <br /> pounds are estimated. The analysis includes determi- <br /> nation of the physical properties of the compounds, the <br /> relevant site physical characteristics, and the potential <br /> ways in which the Compounds and the migration pathway <br /> interact. Interactions frequently examined include <br /> solubilization, volatilization, desorption/desorption, <br /> photo-oxidation, and biodegradation, At this site the <br /> fate analysis will focus on potential ground water and <br /> i vapor phase transports. <br /> Exposure Assessment -- The exposure assessment identifies <br /> potential human receptors and activities that may result <br /> in exposure. Exposure levels can be described qualita- <br /> tively or, using modeling techniques and ass',Ampt:ions, <br /> quantitative estimates of the daily intakes of the <br /> contaminants of concern can be developed. <br /> Risk Characterization - Risk characterization integrates <br /> the results of the preceding steps to describe the hazard <br /> level associated with fuel contamination at: a site. <br /> Guidelines for conducting RAs in California and the U.S. have <br /> been published in; <br /> California Department of Health Services Site Mitigation <br /> Tree (1.9861 <br /> 6 <br /> i <br />