nated areas. If this location was characterized with
ing present at concentrations ranging from less
than 100 to over 6000 g/g.
a single grab sample, the hot spot at sample 7
would most likely be missed. The availability of
Precision estimates from duplicate on-site
an inexpensive on-site test would increase the
analyses for sampling location 4 were approxi-
likelihood that investigators would detect this hot
mately equivalent to corresponding laboratory
spot and delineate its dimensions, thereby allow-
analyses (mean RSD for field was 12.5 vs. 13.5%
ing its cleanup with minimal inclusion of soils
for lab), suggesting that on-site methods of ho-
with concentrations below action levels.
mogenization were adequate for this soil.
Mean concentrations for individual samples at
location 4 differed substantially, but much less so
Hawthorne AAP
than those obtained for locations 13. For this
Sampling location 4
reason, ANOVA was first conducted with
Analytical results for sampling location 4 at
untransformed data. The F ratios obtained were
Hawthorne AAP are presented in Table 4a. Ac-
166 and 133 for field and lab data, respectively
etone extracts at this location turned reddish upon
(Table 4b), which were statistically significant at
reaction with the EnSys reagent, indicating that
greater than the 99.9% level. Although log-trans-
TNT was likely to be the major contaminant
formed data were also analyzed and ANOVA gave
present. Laboratory analysis confirmed TNT be-
similar results, the variances for untransformed
Table 4. Results from sampling location 4, Hawthorne AAP site.
a. Analytical results.
TNT on-site
Laboratory analysis (g/g)
analysis
(g/g)
Sample
TNB
TNT
2,4-DNT
Total
Discrete samples
1a
6180
68.2
6580
13.8
6660
1b
5570
63.3
5810
8.2
5880
2a
2900
18.8
3490
--
3510
2b
3320
48.2
3980
--
4030
3a
1270
50.8
1340
--
1390
3b
1060
47.6
1050
--
1100
4a
578
92.2
492
21.6
606
4b
549
79.1
472
15.7
567
5a
63.1
18.3
126
--
144
5b
107
--
72.5
--
72.5
6a
1740
44.0
2010
--
2050
6b
1920
50.3
1910
11.9
1970
7a
1090
50.3
1140
--
1190
7b
1270
36.4
1070
--
1110
mean
1970
2160
Composites
C1
1680
35.7
1510
7.1
1550
C2
1810
42.8
1660
6.9
1710
C3
1480
40.8
2170
--
2210
C4
1930
52.1
2300
--
2350
C5
2010
62.1
2180
25.9
2270
C6
1690
44.6
1890
--
1930
C7
1680
--
1930
21.6
1950
mean
1760
2000
std. dev.
178
298
17