||Estimating Sample Requirements for Field Evaluations of Pesticide Leaching.
Smith, C. N. ;
Parrish, R. S. ;
Carsel, R. F. ;
||Environmental Research Lab., Athens, GA. ;Computer Sciences Corp., Athens, GA.
Ground water ;
Water pollution ;
Confidence limits ;
Field tests ;
Soil properties ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||A method is presented for estimating the number of samples needed to evaluate pesticide leaching threats to ground water at a desired level of precision. Sample size projections are based on desired precision (exhibited as relative tolerable error), level of confidence (90 or 95%) and estimates of variability (expressed as the coefficient of variation) for selected pesticide and soil characteristics. Summary tables of descriptive statistics are provided as guides for projecting variability of various soil characteristics, pesticide properties (sorption, degradation), pesticide concentration profiles and inorganic solutes. These data were compiled through a comprehensive search of review articles and of reports of laboratory and field studies. The parameters selected are measurements generally required for conducting field pesticide leaching studies. They are also useful for evaluating ground water contamination by calibrating and conducting sensitivity testing with solute transport models. (Copyright (c) Environmental Toxicology and Chemistry, Vol. 6, pp. 343-357, 1987.)
||Pub. in Environmental Toxicology and Chemistry, v6 n5 p343-357 May 87. Prepared in cooperation with Computer Sciences Corp., Athens, GA.
|NTIS Title Notes
||Reprint: Estimating Sample Requirements for Field Evaluations of Pesticide Leaching.
|PUB Date Free Form
||PC A03/MF A01