Table 2. Concentrations of HMX (mg/kg) by SW-846 Method 8330 at firing range 44

RESULTS AND DISCUSSION - SR98_090015

Areal distribution of contaminants

SR98_09
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2.52 mg/kg, respectively (Fig. 7a). In grid B, mean

ture contents than soils samples from shallower

concentrations declined with depth as well. Mean

depths. Whether the higher concentrations found

concentrations of HMX in grid C were again much

at 105120 cm are connected with the higher mois-

higher in the surface soil (109 mg/kg) than at

ture contents is uncertain. Remember, the deep-

depth. Concentrations of HMX in grid D were

est samples were collected differently from those

much lower in the surface (1.44 mg/kg) than in

at the surface through 60 cm because it was

the grids nearer the target and, with only one

impractical to excavate to this depth in a soil pro-

exception, undetectable in subsurface soils.

file consisting of dry sands. Thus, it is possible that

Mean concentrations from the 105- to 120-cm

some of these deep samples may have been inad-

depth in both grids A and B from sampling areas

vertently contaminated by surface material. Since

1-44 showed higher concentrations of HMX than

some individual deep samples showed no increase

samples from either the 30- to 45-cm or 45- to 60-

in concentration, while adjacent samples showed

cm depths. However, the differences were not sta-

large increases, this explanation should be consid-

tistically significant, owing to the very large varia-

ered in planning future tests.

tions in results for the 105- to 120-cm depth. The

Concentrations of RDX (Fig. 7b), TNT (Fig. 7c),

reason for this anomalous result is uncertain, but

4-AmDNT, and 2-AmDNT were largely detected

the deepest soils had substantially higher mois-

in soil from the 0- to 15-cm depth in sampling area

Table 2. Concentrations of HMX (mg/kg) by SW-846 Method 8330 at

firing range 44 (location 144).

* Duplicate subsample.

† Not detectable.

Western Governors University

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