from Throg's Neck (site 7) were significantly toxic to polychaete growth, causing 0.0% growth relative 

 to the controls (the lowest rate of growth observed). Also, sediments from site 28 in East Reach 

 (western Raritan Bay) and site 29 in Sandy Hook Bay were significantly toxic and caused very low 

 rates of growth. The polychaete test appeared to be more sensitive than the sand dollar test, indicating 

 13 of 17 samples were significantly different from controls, as compared to 8 of 17 in the sand dollar 

 test. Sediment from only two of the sites were not significantly toxic in both tests: those from site 36 in 

 lower New York Harbor and site 37 in the entrance to the estuary. Sediments from five of the sites were 

 toxic to both species. The observations of toxicity in site 11 (East River), site 17 (near Shooters Is- 

 land), site 16 (Newark Bay), site 20 (lower Raritan River), and site 29 (Sandy Hook Bay) were consis- 

 tent with those of previous investigators. Also, they were consistent with the results of the Microtox tm , 

 bivalve larvae, and amphipod tests. 



Table 11. Results of polychaete (Armandia brevis) impaired growth tests, and sand dollar 

 (Dendraster excentricus) impaired growth tests of sediments from the Hudson-Rartian estuary 

 (from Rice et al., in press). 



*Significantly reduced growth compared to controls (percent growth observed relative to normal con- 

 trols). 



Estimates of Spatial Extent of Toxicity. The spatial extent of toxicity was estimated separately with 

 the data from both Phases 1 and 2 (Tables 12, 13 and 14). The size of the entire survey area sampled 

 during Phase 1 was estimated at 350 km 2 . During Phase 2, the survey area covered approximately 12.7 

 km 2 , some of which overlapped with the area sampled during Phase 1. The area in which toxicity test 

 results were less than 80% of the control responses was determined. 



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