The detailed gas-chromatographic and mass-spectral analyses of the 

 samples collected at each site indicated a lack of significant petroleum 

 hydrocarbons throughout the study at Sites 1, 4, 9, and 10 (Tables 10, 

 13, 18, 19). Site 2 showed some evidence of weathered hydrocarbons in 



1978 and a significant input of fresh petroleum hydrocarbons in July 

 1980 (Table 11). Site 3 had significant concentrations of weathered 

 petroleum origin throughout the study (Table 12). Sites 5 and 6 showed 

 an alteration of the hydrocarbon mixture with time that indicated the 

 occurrence of biodegradation (Tables 14, 15). Samples at Sites 7 and 8 

 continued to show the presence of a relatively unweathered hydrocarbon 

 mixture up to two years following the AMOCO CADIZ spill (Tables 16, 17). 

 It appears that undegraded hydrocarbons were seeping into the surface 

 sediments at Site 8 and it is postulated that either shifts in the 

 sediment were repeatedly exposing hydrocarbons that had been protected 

 from microbial degradation and/or that some oil continued to be washed 

 ashore from the sunken AMOCO CADIZ vessel. Site 11 showed clear 

 evidence of heavy oiling from the TANIO spill which persisted for a year 

 following the spill (Table 20) . The offshore sites sampled in November 



1979 in the Bay of Morlaix failed to show the presence of AMOCO CADIZ 

 oil. 



TABLE 10. Hydrocarbon concentration ng/g. 

 SITE 1 

 C-# 12-78 3-79 8-79 11-79 3-80 7-80 6-81 



12 



