ARCHIVED REPORTS XR0001091 - Laserfiche WebLink

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' 30 March 2004 . AGE-NC Project No 02-0962 ' Page 4 of 7 4.0. FINDINGS I The stratigraphy and ground water hydrogeology underlying the site was characterized from the field ' descriptions Hydrocarbon impact to the soil and groundwater was assessed by laboratory analysis- , ' 41 STRATIGRAPHY In general, light brown to orange brown fine-grained soil consisting of clayey silt to silty clay was I encountered from surface grade to 20 feet below surface grade(bsg), characteristically,the material had low plasticity and toughness with a dry to slightly moist moisture content Brownish-gray or brown, moist to saturated, poorly graded sandy silt to fine sand was encountered between 20 and ' 30 feet bsg Hydrocarbon-like odor was detected in soil samples collected from boring B2 at 25 and 30 feet bsg Organic vapor was detected by the OVM in soil samples collected from boring B2 at concentrations as high as 59 parts per million (ppm), in sample B2-25 f• Stratigraphic cross sections are depicted in Figures 4-10 The soil boring logs are provided in Appendix A 42 HYDROCARBON-IMPACTED SOIL A total of 19 soil samples from the seven soil borings were analyzed for the petroleum hydrocarbon products listed in Section 3 2 The following target analytes were detected I • TPH-g and TPH-d were detected In soil samples collected from borings B3 at 10 feet bsg (B3-10) and 15 feet bsg (B3-15) and boring B7 at 30 feet bsg (B7-30), at maximum concentrations of 47 milligrams per kilogram (mg/kg) TPH-g and i 10 mg/kg TPH-d, In sample B3-15 Laboratory chromatograms show the TPH-g concentrations were detected within the diesel-range spectrum, indicating that the TPH-g may actually be degraded diesel fuel • MTBE and xylenes were detected in the soil sample collected from boring B3 at 15 feet bsg, at concentrations of 0 045 mg/kg and 0 10 mg/kg, respectively No other target analytes were detected at or above laboratory detection limits in any other of the samples analyzed Analytical results of soil samples are summarized on Table 1 The lateral I distribution of TPH-d soil contamination is depicted in Figure 3 The laboratory reports (CTEL Project No CT214-0311002), quality assurance and quality control (QA/QC) report and chain-of- custody forms are included in Appendix B Advanced GeoEnvironmental,Inc