Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Estimation of Background Levels of Contaminants.
Author Singh, A. ; Singh, A. K. ; Flatman, G. ;
CORP Author Lockheed Environmental Systems and Technologies Co., Las Vegas, NV. ;Nevada Univ., Las Vegas. Dept. of Mathematics.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Publisher c1994
Year Published 1994
Report Number EPA-68-C0-0049; EPA/600/J-94/375;
Stock Number PB95-124822
Additional Subjects Hazardous materials ; Statistical analysis ; Environmental monitoring ; Pollution sampling ; Site characterization ; Background ; Estimation ; Quality assurance ; Probability distribution funtions ; Statistical distribution ; Comparative evaluations ; Concentration(Composition) ; Superfund ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB95-124822 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/06/1995
Collation 29p
The chapter describes a statistical approach for assessing background levels from a dataset. These elevated values that may be associated with a plume or contaminated area of the site are separated from lower values that are assumed to represent background levels. It would be desirable to separate the two populations either by Kriging the data or chronologically by a time series analysis, provided an adequate number of samples were properly collected in space and/or time. Unfortunately, quite often the data are too few or too improperly designed to support either spatial or time series analysis. The paper provides a robust probabilistic approach for gaining this information from poorly collected data that are suitable for above-mentioned alternative approaches. The method presented here is quite general and is suitable for many geological and biological applications.