This project was designed to: * Review all available sources of analytical and research data regarding the binding and potential for remobilisation of endosulfan on bottom sediments * Based on the results of the review and data analysis, make recommendations regarding future research requirements Based on the survey the following conclusions can be made: * Contamination of sediments by endosulfan is a normal occurrence where significant residues are transported from sites of application to rivers in runoff. However, there is no compelling evidence available of widespread ecological hazards from storage of endosulfan at high concentrations in sediments. No such cases of long~term storage have been reported. * Contamination of sediments does occur at a moderate level near application points, with transient ecotoxicological effects, but there are no reports in the literature of major contamination of water resulting from subsequent mobilisation of endosulfan stored in sediments. * The current concern regarding possible storage of endosulfan in sediments would most effectively be countered if carefully targeted research were conducted. * It is recommended that research should be conducted to determine the probable size of the pool of residues present in sediments and to measure the rate and extent of partitioning of endosulfan residues in sediments into the water column. This study would best be achieved in farm reservoirs because of the uncertainty of riverine systems.