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FIGURE 3.39. Sediment core sampling
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locations (Ward).
The basic set of data, where GC and GC/MS data exist, is illustrated
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 weathering,
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
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