Record Display for the EPA National Library Catalog

RECORD NUMBER: 6 OF 8

OLS Field Name OLS Field Data
Main Title Use of Geostatistics to Predict Virus Decay Rates for Determination of Septic Tank Setback Distances.
Author Yates, M. V. ; Yates, S. R. ; Warrick, A. W. ; Gerba, C. P. ;
CORP Author Arizona Univ., Tucson.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Year Published 1986
Report Number EPA-R-811147; EPA/600/J-86/230;
Stock Number PB87-166849
Additional Subjects Ground water ; Viruses ; Water supply ; Septic tanks ; Sampling ; Water wells ; Correlation ; Mathematical models ; Enteritis ; Gastritis ; Potable water ; Rural areas ; Regulations ; Separation ; Distance ; Reprints ; Drinking water ; Decay rates
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB87-166849 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 7p
Abstract
Water samples were collected from 71 public drinking-water supply wells in the Tucson, Arizona, basin. Virus decay rates in the water samples were determined with MS-2 coliphage as a model virus. The correlations between the virus decay rates and the sample locations were shown by fitting a spherical model to the experimental semivariogram. Kriging, a geostatistical technique, was used to calculate virus decay rates at unsampled locations by using the known values at nearby wells. Based on the regional characteristics of groundwater flow and the kriged estimates of virus decay rates, a contour map of the area was constructed. The map shows the variation in separation distances that would have to be maintained between wells and sources of contamination to afford similar degrees of protection. (Copyright (c) 1986, American Society for Microbiology.)