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ATTORNEY-CLIENT PRIVILEGE 3.0 PARTMONING STUDIES 3.1 SAMPLING In April, 1993, ChemRisk® obtained two soil samples containing Site-related hydrocarbons at depths of 13-14 feet below ground surface to conduct partitioning studies These studies were performed by Global Geochemistry Corporation The studies were performed to determine which, if any, of the petroleum hydrocarbons constituents which were present in the soil may partition into percolating water To maximize the potential migration of the hydrocarbons, the soil samples were mixed with distilled water, placed in sealed bottles with no headspace, and rotated on a rolling table for 48 hours at room temperature The samples were then filtered to collect the water The filtered water was extracted using methylene chloride to isolate the extractable organic material In order to separate the aromatic hydrocarbons from the polar compounds, the sample was separated using column chromatography Finally, to see if any hydrocarbons were present at extremely low Ievels in the sample, the saturate fraction was concentrated and injected into a gas chromatogram 3.2 SAMPLINc. RESULTS Results showed that no petroleum hydrocarbons had partitioned into the water The resulting chromatograms for the water extract and laboratory water blank are presented in Figures 3-1 and 3-2, respectively The sample was then concentrated an additional 10-fold to below normal detection limits to qualitatively determine whether any hydrocarbons had partitioned into the water The concentrated sample revealed that the straight chain hydrocarbons from C,4 to C19 and various branched chain hydrocarbons were present at extremely low concentrations in the water (Figure 3-3) It is not possible to determine the origin of these hydrocarbons it is likely that the source is the laboratory water (the same peaks were present in both the sample and the blank) (Figures 3-4 and 3-4, respectively) Another possible source may be organic material in the soil A third possible source is petroleum hydrocarbons These concentrations could not be quantified because they were below the normal analytical detection limit The original soil samples were also extracted using methylene chloride and separated on a column in the same manner as described above The saturate fractions of the two samples were combined to perform the gas chromatography (GC) and gas chromatography-mass spectroscopy (GC-MS) analysis and the aromatic tractions were also combined for GC-MS analysis The soil and blank chromatograms are presented in Figures 3-5 and 3-6, respectively f G%"ELmoPrrDCLOSURE%ML-QSOkM71 7 00' 4