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• <br /> 1 7 <br /> 5.3 Soil Sample Results <br /> 1 TPH-d was detected at concentrations of 28 mg/kg and 2,000 mg/kg in soil samples D5-2 and D8-2, <br /> respectively. TPH-d was not detected above the laboratory detection limit for soil sample D9-2. <br /> 1 TPH-g was detected at a concentration of 26 mg/kg in soil sample D8-2. TPH-g was not detected <br /> above the laboratory detection limit for soil samples D5-2 and D9-2. <br /> 1 BTEX and fuel oxygenates were not detected above the laboratory detection limits in soil samples <br /> D5-2, 138-2 or D9-2. <br /> Soil sample laboratory analytical results have been summarized in Table 1. Soil samples were <br /> analyzed by Entech Analytical Labs,Inc., a State-certified hazardous waste testing laboratory based <br /> in Santa Clara, California. The laboratory and quality control reports, along with chain-of-custody <br /> 1 documentation are provided in Appendix A. <br /> 6.0 CONCLUSIONS <br /> The following conclusions have been drawn based on the data presented above: <br /> 1 Petroleum hydrocarbons in soil remaining on Site appear limited to the immediate vicinity of <br /> soil samples D2, D8 and D8-2. <br /> 1 Petroleum hydrocarbons in subsurface soils primarily consist of diesel. Volatile constituents <br /> such as BTEX and fuel oxygenates were not detected in 20 of the 22 soil samples collected and <br /> analyzed as part of this investigation. <br /> 7.0 RECOMMENDATIONS <br /> 1 FREY recommends that a no further action letter be granted for,the Site based on the following: <br /> 1 Petroleum hydrocarbons remaining in on Site soils consist primarily of diesel. The greatest <br /> detected diesel concentration remaining in on Site soils is 2,000 mg/kg as reported in sample <br /> D8-2, collected from an approximate depth of 7 feet bgs. <br /> 1 Diesel is a moderately unrefined hydrocarbon compound which has a relatively low propensity <br /> for vertical or lateral migration in lower permeability soils such as the hard clays and silts <br /> 1 present beneath the Site. <br /> 1 FREY <br /> i <br />