Table 6. Summary of selected constituent analyses of RMA Basin F soil sample
no. 24216 at different levels of DCR reagent addition with and without compac-
tion.
64.7% DCR
27.4% DCR
27.4% DCR
Raw waste
reagent
reagent
reagent
before
addition
addition
addition
Waste constituent
treatment
(loose)
(loose)
(compacted)
Gravimetric oil and grease1
(mg/kg dry wt.)
10,700
12,900
41,800
15,200
Total resolved pesticides1--ECD GC
(mg/kg dry wt.)
3,270
2,150
2,110
1,110
Aldrin (ng/g dry wt.)
390,000
270,000
N.A.
350,000
Dieldrin (ng/g dry wt.)
260,000
180,000
N.A.
220,000
Endrin (ng/g dry wt.)
140,000
100,000
N.A.
120,000
1,2,4-trichlorobenzene
(ng/g dry wt.)
210
120
N.A.
< 16
Hexachlorobutadiene
(ng/g dry wt.)
6,900
630
N.A.
750
* Analyses denoted by superscript1 completed by SOUND/epic, all others by U.S. Army Corps of
Engineers Environmental Laboratory, Hubbardston, Massachusetts.
N.A. = Not analyzed
more significant improvement with DCR-treated
DCR process, a separate chromatogram of the soy
sample compaction. Significant reductions in leach-
oil is also presented. Clearly, the DCR process
able aldrin, dieldrin, and endrin were observed af-
does not liberate or add any undesirable aromatic
ter the initial DCR treatment at 64.7% reagent addi-
or petroleum hydrocarbon constituents to the soil.
tion (Table 7). When the reagent addition was
The only change in the chromatogram of the DCR-
dropped to 27.4% and the sample was compacted,
treated sample is the addition of three higher mo-
lecular weight peaks (retention times 53.286,
even further reductions in leachable pesticides
54.562, and 57.135 min) from biodegradable free
were observed. In contrast to the 64.7% reagent
addition, these reductions at the low reagent addi-
fatty acids or triglycerides in the soy oil.
tion cannot be attributed solely to reagent dilution
of the soil. Because of the interest in pesticide
Leachability
leachabililty, these later tests were run in duplicate,
As was the case with the 64.7% DCR-treated
and in one case the leachable endrin was measured
sample, no volatile constituents were identified in
right at the RCRA limit of 20 ppb. In the other
the leachate of the 27.4 % DCR-treated soil (Table 5).
replicate, endrin was just slightly higher at 28 ppb.
The TCLP leachable pesticide data show an even
Table 7. Summary of TCLP leachable constituent analyses on RMA Basin F soil
sample no. 24216 before and after DCR treatment.
27.4 % DCR
Raw waste
64.7% DCR
reagent
RCRA
CA STLC
before
reagent
(compact)
regulatory
regulatory
(g/L)
treatment
(loose)
limit
limit
(g/L)
(g/L)
(g/L)
(g/L)
Waste constituent
Rep. 1
Rep. 2
Aldrin
52
30
4.0
4.8
n.a.
140
Dieldrin
90
51
31
42
n.a.
800
Endrin
74
44
20
28
20
20
1,2,4-trichlorobenzene
<1.9
<1.9
N.A.
n.a.
n.a.
Hexachlorobutadiene
3.4 J
<1.8
N.A.
500
n.a.
CA STLC = State of California Soluble Threshold Limit Concentration
J = Estimated value; less than the practical quantitation limit.
n.a. = Not applicable
N.A. = Not analyzed
14
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