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KLEINFELDER Kleznfelder indicated to Friedman & Bruya that the soil consisted of clay that was low in porosity and permeability This type of soil would greatly decrease the amount of water and air movement within the soil This would typically cause the rate of degradation to be very slow It also may be in anaerobic conditions, which would decrease the rate even more Based on a slow rate of degradation, it appears that the kerosene range material has been released for some time The lack of n-alkanes indicates advanced degradation The age of this product is likely to be older than ten years The diesel #2 range material appears to be from a more recent release The lack of significant degradation is shown by the Gaussian curve of n-alkanes The age of this product is therefore much newer, and it appears to have been released within the last five years ' 4 3 CONCLUSIONS Independent Trucking Company has excavated approximately 1400 cubic yards of soil since the diesel fuel release in May 1995 Given the volume soil excavated and the chemical and forensic testing results, it appears that Independent Trucking Company has removed the bulk, if not all, of the fuel released in May 1995 This conclusion is based on the following information • Independent Trucking Company excavate d 500 cubic yards of impacted soil initially after the release occurred Confirmations samples were collected from the initial excavation with no detectable petroleum hydrocarbon concentrations • Kleznfelder drilled and sampled six soil borings that indicated that the extent of migration was limited to less than a depth of 10 feet with the exception of one boring which had petroleum hydrocarbons detected at 10 feet, but not at 15 feet • An additional 900 cubic yards of soil were excavated to a depth of 21 feet ' • Forensic hydrocarbon analysis of a sample from the bottom of the second excavation indicates that two materials are present in the soil One is a weathered diesel 41/kerosene which appears to be older than 10 years based on weathering patterns The second is a diesel 42/home heating oil that appears to have been ' released within the last five years • TPH purgeable was detected in all three samples analyzed with concentrations up to 630 mg/kg This would indicate a petroleum hydrocarbon such as gasoline which was not stored in the aboveground storage tanks 23-482276-BOO/CR96S276 Page 8 of 1 1 October 17, 1996 ' Copyright 1996 Kleinfelder,Inc