the gas chromatographic procedure developed at
the close-interval sampling, are 354,981.6E,
CRREL. Samples taken from the smoke round cra-
6,801,183.8N. The site was located 160 m west of
ter were shipped to CRREL for analysis of P4.
the observation tower in Area C and was marked
with survey lath. Surface samples were collected
Analysis of data
at the center point and at 1-m intervals from the
Nonparametric statistics (sign test for paired
center point out to 5 m, for a total of 41 samples.
observations) (Natrella 1963) were used to com-
Eight duplicates were taken also. Samples were
pare the concentrations found in 1992 and 1994
shipped to Waterways Experiment Station
around site 883. Nonparametric statistics were
(Vicksburg, Mississippi) for analysis of P4 using
used since the data are not normally distributed.