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I RISKPRO'S SESOIL for Windows User's Guide I not consider the potential upward movement of the chemical=with the upward movement of wleorrl due to soil evaporation losses ' SESOIL is a useful screening-level chemical migration and fate model The model is relatively easy toj use, the input data are straightforward, and most of the model parameters can be readily ' estimated or obtained Sensitivity analysis studies with SESOIL can be done efficiently. SESOIL can be applied to generic environmental scenarios for purposes of evaluating the general behavior of chemicals Care should be taken when applying SESOIL to saes with targe vertical I variations in soil properties since the hydrologic cycle assumes a homogeneous soil profile Only one value for-ttie~soil moisture content is computed for the entire soil column' If different perrneabilities are input for each soil layer, the soil moisture content calculated in the hydrologic I —_ cycle-using-the vertically-averaged_permeability_(Eq _[31)_may_not_be valid-for_the-entire_soil— column Thus, the user is warned that even though the model can accept different permeabilities ' for each layer, the effects of vanable permeability are not fully accounted for by the model. It is recommended that predictions for the hydrology at a given site be calibrated to agree with known measurements Caution should be used_when making conclusions based on modeling results when little hydrologic data exist against which to calibrate predictions In these cases, it is recommended that the user employ sensitivity analysis or evaluate results obtained by assigning distributions to the input parameters (e g., see Gardner, 1984, O'Neill et al., 1982; Hetrick et al , 1991) However, when properly used, SESOIL is an effective screening-lev tool in assessing chemical movement in sods 3.6 Data Requirements - - The- input-data---in-SESOIL- can be-grouped-intofive categories climate;--soil, chemical, - application, and w_ashload, each of which corresponds to one of five input files that are required by a SESOIL run- The CLIMATE data,file contains monthly rainfall statistics and monthly I climatic parameters for calculating ,evaporatranspiration. The- SOIL data consists of soil parameters averaged over the entire unsaturated zone, such as the bulk density of the soil, intnnsic permeability, organic carbon content, etc The CHEMICAL data requires the chemical -property information (e.g , the solubility and the adsorption coefficient of the chemical). The APPLICATION input describes the compartment specifications, the characteristics of the I pollutant loadings, and some layer-dependent soil properties For instance, the compartment specifications include number of layers and sublayers for each layer, application area of compartment, and layer thickness. The WASHLOAD"data is optional and contains data used I by SESOIL to calculate washIoad transport, the migration of the pollutant adsorbed to eroding soil particles All the parameters of the five different input files are listed in Table 3 3. r' r Page 32