Table 5.

Prey, sediments, and seawater tpah data for the Harlequin Duck risk model.^a,b

A) PREY TISSUES (ng·g−1 dry weight)
	Oiled-Site Prey TPAH			Reference-Site Prey TPAH
Prey Category	Mean	Standard Deviation	Sample Size	Mean	Standard Deviation	Sample Size
Gastropods	23.04	8.09	26	20.76	8.42	7
Mussels	45.87	28.99	96	33.11	17.99	27
Clams	72.08	68.88	54	42.69	22.14	12
Crustaceans	25.54	4.80	15	31.07	7.85	4
Fish eggs	53.07	3.09	12	54.15	3.87	23
Other inverts	107.65	102.43	26	47.82	24.25	6
B) SEDIMENTS (ng·g−1)
	Oiled-Site Sediments TPAH			Reference-Site Sediments TPAH
	Mean	Standard Deviation	Sample Size	Mean	Standard Deviation	Sample Size
	63.21	132.37	51	28.27	33.27	27
C) SEAWATER (ng·L−1)c
	Oiled-Site Seawater TPAH			Reference Seawater TPAH
	Mean	Standard Deviation	Sample Size	Mean	Standard Deviation	Sample Size
	8.48	3.57	23	7.62	1.54	12

^aSee text for data sources; all data available at http://www.valdezsciences.com/polycyclic_aromatic_hydrocarbon.cfm

^bAll PAH data in the base risk assessment model substitute ½ MDL for each non-detect analysis; some sensitivity analyses were conducted using other substitutions for non-detects; see text for details.

^cOiled seawater samples were collected off initially oiled shorelines that were found to have SSOR. Reference seawater samples were collected off initially oiled shorelines that did not have SSOR, as no seawater samples exist for never-oiled shorelines.