I. EXECUTIVE SUMMARY
3
vented flooding during the 32.3-ft event, 1.2 ft above normal flood stage.
This gave us a 52-day contiguous non-flooded period during the critical
first months of the season when rainfall is low and attenuation conditions
are at their best. Significant drying occurred in the A Ponds for the first
time, and results from all ponds except Pond 730 indicate this was a very
successful season.
Logistics continue to be refined, with an emphasis on optimizing the uti-
lization of helicopters when on site. Deployment of the discharge line and
heavy equipment is now accomplished in one day. Sling loading the pipe
in and out of the Flats has proved to be quite effective, although there were
problems getting the right helicopter for the job. The heavy equipment
aerial transfer operations are going quite smoothly, with Weldin, CRREL,
and the National Guard all contributing to the effort. In August, all the
equipment was transferred to the EOD Pad by 1430 hours, even though we
had more equipment in the field than we have ever had for the project. As
a result of preventing flooding in June and optimizing flight time with the
commercial helicopter, ,000 was saved on that contract. The money will
go towards a badly needed overhaul of the generator sets this fall and to
exercise the gensets over the winter.
A team from Weldin Construction, Inc., led by Terry Edwards, conducted
the field operation and maintenance work again his year. The results were
excellent, and again no significant unplanned downtime occurred. The con-
trols were once again reconfigured and rewired to address stuck float
switches. This will also increase the reliability of the systems, as the con-
trols were simplified in the process. A revised video monitoring system was
deployed with very good results and was used throughout the season to
monitor conditions in both Area A and Area C. The meteorological site was
once again operational and accessible over the internet at the Flats web site.
Next season looks to finally be favorable for remediation at the Flats.
Moderate flooding tides in mid-July may be contained by the tide gates,
and major flooding tides will not occur until mid-August. A determina-
tion, based on sampling work, will have to be made on where the systems
will need to be deployed next season, and additional blasting work will
need to be done to address areas found to be contaminated this year. The
purchase of light-weight, single-wall fuel transfer tanks capable of being
lifted by the A-Star helicopter is anticipated to further reduce helicopter
expense.
III-2. TREATMENT VERIFICATION: MONITORING THE
REMEDIATION OF WHITE-PHOSPHORUS-CONTAMINATED
SEDIMENTS IN TREATED PONDS
Marianne E. Walsh, Charles M. Collins, and Ronald N. Bailey
The in-situ decontamination of white-phosphorus-contaminated sedi-
ments at ERF by pond pumping was monitored again with the three part
approach we developed in 1997. To see if pond pumping produced condi-
tions favorable for sublimation/oxidation of white phosphorus particles,
we used dataloggers to record sediment moisture and temperature, and we
measured residual white phosphorus from particles we planted in the sur-
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