EAGLE RIVER FLATS FY 00
54
solidated and cracked (Fig. III-2-8). The loss
Pond 75 in Coastal East were frequently
of white phosphorus from the planted par-
flooded by tidal water from the Bread Truck
ticles was 10%.
ditch, compromising our remediation efforts
Pond 75, which is northeast of the Bread
in these areas.
Truck Pond, contains the only positive grid
The north side of the Bread Truck Pond
composite sample we located last year in Ar-
dried because of drainage through the blasted
eas C/D and Coastal East. A ditch (Fig. III-2-
ditch, and as a result, white phosphorus in
8) was explosively excavated to connect this
the surface sediment has declined signifi-
pond to the sump in Pond 730. Although wa-
cantly. Continuing advancement has resulted
ter from the pond was drained away, the sedi-
in more efficient drainage of the south side of
ments remained saturated most of the sum-
the Bread Truck Pond and what appears to
mer. Again, flooding from the Bread Truck
be a decrease in white phosphorus concen-
ditch affects this pond. A tide gate in Bread
trations in composite samples.
Truck and a sump and pump in this region
The surface sediment in the AquaBlok pond
are recommended.
(#285) is highly contaminated, and further
remediation is needed.
Pond 285 (Racine Island)
The surface sediments of Pond 285 are
highly contaminated. Of the five composite
REFERENCES
samples collected in August 2000, all were
positive, with white phosphorus concentra-
Collins, C.M., M.T. Meeks, M.R. Walsh, M.E.
tions ranging from 0.023 to 6.90 g/g (Fig. III-
Walsh, and R.N. Bailey (1997) Pond drain-
2-6). This range of concentrations is higher
ing treatability: 1996 studies. The draining of
Bread Truck Pond. In Interagency expanded site
than we found in the Bread Truck Pond and
investigation: Evaluation of white phosphorus con-
Area C when we established transects across
tamination and potential treatability at Eagle
those ponds in 1997. Of the eight discrete
River Flats, Alaska. (C.M. Collins and D. Cate,
samples we collected from Pond 285, six were
positive and ranged in concentration from
Ed.). CRREL Contract Report to US Army,
0.00014 to 6.38 g/g. Given that we sampled
Alaska, Directorate of Public Works. FY96 Fi-
only the soft surface sediment, as would dab-
nal Report. p. 5171.
bling ducks and swans, white phosphorus is
Hemond, H.F., and D.G. Chen (1990) Air en-
try in salt marsh sediments. Soil Science,
readily accessible to feeding waterfowl in this
pond. Further remediation is necessary.
150(1): 459468.
Racine, C.H., M.E. Walsh, C.M. Collins, D.
Lawson, K. Henry, L. Reitsma, B. Steele, R.
Harris, and S.T. Bird (1993) White phospho-
CONCLUSIONS
rus contamination of salt marsh sediments at
Pond pumping has been a major success in
Eagle River Flats, Alaska. CRREL Contract
Ponds 183 and 146 of Area C and Ponds 258
Report to the US Army Environmental Cen-
and 256 in Area A. White phosphorus con-
ter, Aberdeen Proving Ground, MD AEC Re-
tamination levels in Area C have declined
port No. ENAEC-IR-CR-93063.
dramatically and may be undetectable in a
United States Environmental Protection
few years. The present levels of white phos-
Agency (1995) Method 7580: White phospho-
rus (P ) by solvent extraction and gas chro-
phorus contamination measured in Pond 183
4
matography. In Test methods for evaluating solid
indicate that there is little likelihood that haz-
waste, physical/chemical methods (SW-846), Up-
ardous amounts of white phosphorus par-
date III. Washington D.C.: U.S. EPA, Office of
ticles remain. Pond 155, which is north of
Solid Waste, p. 7580-1 to 7580-20.
Pond 183, still contains white phosphorus at
Walsh, M.E., and C.M. Collins (1993) Distri-
hazardous levels. Pond 730 in Area C/D and
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