ARCHIVED REPORTS XR0013118 - Laserfiche WebLink

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FRIEDMAN &BRUYA, INC. ENVIRONMENTAL CHEMISTS Date of Report: 09/28/99 Date Received: 09/24/99 Project: 5650 Date Extracted: 09/24/99 Date Analyzed: 09/27/99 RESULTS FROM THE ANALYSIS OF THE SOIL SAMPLE FOR FORENSIC EVALUATION BY CAPILLARY GAS CHROMATOGRAPHY USING A FLAME IONIZATION DETECTOR (FID) AND ELECTRON CAPTURE DETECTOR (ECD) Sample ID GC Characterization GMX-6-11.5 The GC trace using the flame ionization detector (FID) showed the presence of low and high boiling compounds. The patterns displayed by these peaks are due to the presence of a low boiling distillate and a higher boiling material, possibly a highly degraded fuel off or crude oil. The low boiling compounds appeared as a pattern of peaks eluting from n-C6 to n-C10. These compounds boil in the range associated with gasoline. Absent is the pattern of aromatic hydrocarbons typical of recent gasoline. Their absence may indicate that the gasoline is highly degraded or else that the gasoline is of a formulation that is no longer in use. The high boiling compounds appeared as a pattern of peaks eluting from n-C8 to n-CS2. The material present appears to have undergone chemical or biological degradation due to the presence of a large unresolved mass of material that appears as a broad hump in the GC trace and the apparent presence of - biomarkers including pristane and phytane. The absence of material boiling beyond n-C38 suggests that this material is a petroleum distillate. Because of the possible differences in the composition of crude oil, we are unable to rule out crude oil as a source of the high boiling material at this time. The large peak seen near 25 minutes on the GC/FID trace is pentacosane, added as a quality assurance check for this GC analysis. There is a second surrogate present that is seen on the GC/ECD trace at about 26 minutes which is dibutyl chlorendate. 1