Synthesis of the Results of the Field Verification Program Upland Disposal Alternative
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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Contaminated dredged material from the Black Rock Harbor BRH maintenance dredging project in the U.S. Army Corps of Engineers New England Division was used to field verify a procedures for predicting the quality of effluent discharged from the upland site during filling operations, b procedures for predicting the quality of upland surface runoff resulting from rainfall following disposal, c possible changes in ground-water quality following disposal, d procedures for predicting potential contaminant mobility into plants, and e procedures for predicting potential contaminant mobility into animals. The upland disposal site was constructed within a protected area using conventional construction techniques and was hydraulically filled from barges. The filling operation provided conditions typical of confined dredged material disposal operations. Following filling, a weir allowed free drainage of surface water as with most disposal sites as the fill stabilized through consolidation. Within approximately 9 months, the upland substrate had stabilized at the desired surface elevation. The Modified elutriator test adequately predicted the dissolved concentration of contaminants and the contaminant fractions of the total suspended solids SS in the affluent. Comparison of laboratory results with field data indicated that tile modified elutriator test was a generally conservative predictor. The column settling analysis and corresponding prediction of effluent SS concentration compared favorably with field data and yielded a conservative estimate of the effluent SS. Dissolved oxygen levels showed marked increases due to turbulence, mixing, and atmospheric reaeration, confirming that oxidizing conditions were present in the disposal area ponded water. Total natal concentrations reflected a high removal due to sedimentation in the disposal area, with an average retention of 98.3 percent.
- Solid Wastes and Pollution and Control
- Water Pollution and Control