Contents - trdoer30006

Contents

Preface............................................................................................................................... v

USACE/USEPA Technical Framework for Evaluating Environmental

Effects of Dredged Material Management Alternatives ............................... 1

General Description of Uncertainty Analysis.................................................. 2

Uncertainty nomenclature ......................................................................... 2

Uncertainty analysis methods ................................................................... 3

Improvement of Dredged Material Management Decisions by

Uncertainty Analysis .................................................................................... 4

Ranking of Uncertainty Sources...................................................................... 6

Criteria Used to Evaluate Importance of Uncertainty Sources...................... 10

Failure to consider potential adverse effect ............................................ 10

Magnitude of uncertainty ........................................................................ 10

The ease with which the uncertainty can be quantified .......................... 11

Technical Framework Summary ................................................................... 12

Regulatory Framework .................................................................................. 13

Tier I Evaluation............................................................................................ 15

Identification of contaminants of concern .............................................. 15

Sampling ................................................................................................. 16

Spatial representativeness ....................................................................... 16

Analysis .................................................................................................. 17

Dredged material physical and chemical characteristics ........................ 17

Description of dredging and disposal activities ...................................... 17

Selection of reference sediment .............................................................. 18

Tier II Evaluation .......................................................................................... 18

Water column impact-numerical mixing models.................................... 18

Benthic impact-Theoretical bioaccumulation potential for nonpolar

organic compounds .............................................................................. 19

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