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  As a starting point, we will examine the definitions of the words 'fraction' and 'petroleum.' Our court took judicial notice of these definitions in Wilshire Westwood Assoc. v. Atlantic Richfield, 881 F.2d at 803. In Wilshire, we defined 'fraction' to mean 'one of several portions (as of a distillate or precipitate) separable by fractionation and consisting either of mixtures or pure chemical compounds.' Id. (citing Webster's Third New International Dictionary Unabridged (1981)).

Likewise, in Wilshire we defined 'petroleum' as: An oily flammable bituminous liquid . . . that is essentially a compound mixture of hydrocarbons of different ...