A Risk-Management Strategy for PCB-Contaminated Sediments (2001) / Chapter Skim
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Implementing the Strategy
Implementing the Strategy
Pages 260-270
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From page 260... ...
For instance, estimated risks might change during the implementation process because of unanticipated environmental factors (e.g., floods or storms) or the development of new remediation technologies, new regulatory requirements, or the availability of new scientific data.
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From page 261... ...
These considerations might require that the implementation plans be modified or revised completely. As shown in Box 9-1, New Bedford Harbor offers a specific example of mid-course correction occurring during management, stemming from concerns of local residents about risks from exposures to contaminated sediments and from exposures that might result Tom the management of the sediments.
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From page 262... ...
. Throughout the implementation process, there must be continual feedback between the application of the management option and the subsequent monitoring conducted to establish if risk-management goals and engineering objectives (ifapplicable)
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From page 263... ...
Box 9-2 illustrates the important role played by ambient-air monitoring at the New Bedford site, where high ambient-air PCB concentrations forced a delay in the management process.
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From page 264... ...
Sixteen air-monitoring stations were located around the upper harbor area, and initial concentrations before remedial dredging of the hot spots were collected. Initial background assessments found average PCB concentrations ranging from 10 to 50 ng/m3, depending on the sampling location around the harbor, with maximum concentrations of 100 to 200 ng/m3.
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From page 265... ...
Source: EPA ~ 1997~. Coupling implementation with monitoring will also provide valuable information on the effectiveness of specific remediation technologies and management options.
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From page 266... ...
The report emphasizes several salient issues pertaining to contaminated sediments. The issues addressed include the need for the development of a project plan and the subsequent components, including affected and interested party involvement, interim controls, and source control.
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From page 267... ...
The strict timelines typical of many engineering projects are often not appropriate with sediment-management projects. At these sites, there is a need to minimize or eliminate adverse environmental impacts or human exposure, and these considerations dictate procedures.
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From page 268... ...
The possibility of continuing contaminant inputs, at even extremely Tow concentrations, makes it substantially more difficult to specify engineering endpoints for contractual and operational purposes and complicates subsequent evaluations of both the efficiency and efficacy of contaminated sediment removal or containment and the desired Tong-term benefit of the management strategy. Beyond those operational effects, the potential for continuing contamination can also affect acquisition ofthe required state and
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From page 269... ...
1997. Report of the Effects of the Hot Spot Dredging Operations New Bedford Harbor Superfund Site, New Bedford, Massachusetts.
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From page 270... ...
1999. Major Contaminated Sediment Site Database.
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