Laserfiche WebLink
ATTORNEY-CLIENT PRIVILEGE <br /> below normal detection limits to qualitatively determine whether any hydrocarbons had <br /> partitioned into the water. <br /> The concentrated sample revealed that the straight chain hydrocarbons from C14 to C19 and <br /> various branched chain hydrocarbons were present at extremely low concentrations in the <br /> water (Figure 3). It is not possible to determine the origin of these hydrocarbons. It is <br /> likely that the source is the laboratory water (the same peaks were present in both the <br /> sample and the blank) (Figures 3 and 4, respectively). Another possible source may be <br /> organic material in the soil. A third possible source is petroleum hydrocarbons. <br /> These concentrations could not be quantified because they were below the normal analytical <br /> detection limit. The resulting chromatograms for the concentrated water extract and <br /> concentrated water laboratory blank are presented in Figures 3 and 4, respectively. <br /> The original soil samples were also extracted using methylene chloride and separated on a <br /> column in the same manner as described above. The saturate fractions of the two samples <br /> were combined to perform the gas chromatography (GC) and gas chromatography-mass <br /> spectroscopy (GC-MS) analysis and the aromatic fractions were also combined for GC-MS <br /> analysis. The soil and blank chromatograms are presented in Figures 5 and 6, respectively. <br /> Analysis of Data <br /> An analysis of the sample results was done to determine if Site soil was the origin of the <br /> hydrocarbons detected in the groundwater at the Santa Fe Site. To perform this analysis, <br /> chromatograms were obtained for soil samples as well as for the groundwater samples. The <br /> chromatograms from the soil and groundwater were compared for characteristics such as (1) <br /> retention time (for compound identification), (2) number of peaks (indicative of number of <br /> chemicals present), (3) peak height (indicative of concentrations of each chemical), and <br /> ratios between peak heights (indicative of ratios of concentrations of chemicals). <br /> Three chromatograms from the background soil samples taken in January, 1991 were run. <br /> It should be noted that no detectable levels of petroleum hydrocarbons were found upon <br /> analysis of the soil samples. The chromatogram from the first soil sample, SFW-1-1 revealed <br /> the highest peaks at 11.05, 12.68, 13.12, 16.93, and 23.41 minutes (Figure 7). The <br /> chromatogram from the second soil sample, SFW-2-1 revealed the highest peaks at 11.05, <br /> 12.68, 16.93, and 23.41 minutes (Figure 8). The chromatogram for the third soil sample, <br /> SFW-3-1 revealed the highest peaks at 11.61, 12.68, 16.93, and 23.42 minutes (Figure 9). <br /> The chromatogram for the groundwater detect in SFW-1 revealed the highest peaks at 10.27, <br /> 11.05, and 11.61 minutes (Figure 10). The chromatogram for the groundwater detect in <br /> SFW-2 revealed the highest peaks at 10.26, 11.04, and 13.42 minutes (Figure 11). The <br /> chromatogram for the groundwater detect in SFW-3 revealed the highest peaks at 10.27, <br /> 11.06, and 12.68 minutes (Figure 12). In comparing the soil chromatograms with the <br /> GASTAFFUILLP\DELM.CLO 3 <br />