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FIGURE 3.39. Sediment core sampling locations (Ward). 



The basic set of data, where GC and GC/MS data exist, is illustra- 

 ted by the data in Table 16. However, secondary data products are 

 presented here to illustrate the basic findings of this program segment. 



Illustrative GC traces from March of 1979 are shown in Figures 

 3.40 and 3.41. While the hydrocarbon composition of the control 

 estuary (L'Aber Ildut) is comprised mainly of biogenic compounds the 

 marsh mudflat and beach both contain anthropogenic inputs. The lie 

 Grande "control" has been impacted by the AMOCO oil as its GC profiles 

 closely resemble those for weathered oil. However, the Trez Hir 

 (beach) site consists mainly of compounds of a pyrogenic origin. The 

 impacted sites all illustrate AMOCO oil in various states of weather- 

 ing, the lie Grande (marsh) site containing the best "preserved" oil. 

 This is also indicated by secondary treatment of some of the core 

 aromatic data (Fig. 3.42) where oil in both L'Aber Wrac'h and lie 

 Grande appears to be less weathered at depth. 



Data from the three impacted cores and the control core are shown 

 in Figures 3.43. 3.52, 3.58, and 3.63. Each figure depicts the depth 

 of penetration of AMOCO CADIZ oil throughout the December 1978 to May 

 1980 time period. The C3P/C3DBT ratio is presented as is the level of 

 the non-petrogenic fluoranthene + pyrene (m/e = 202) total. 



Accompanying these figures are graphs of the down-core variations 

 in gross hydrocarbon parameters (i.e. fj_, f2, ALK/ ISO ratio) and 

 detailed aromatic compound families. Figures 3.44 to 3.51 depict 

 details of the L'Aber Wrac'h cores, Figures 3.53 to 3.57 the He Grande 



71 



