ARCHIVED REPORTS_ROY'S AUTO - HISTORICAL (2)

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PROh'1 Ground Zero Ana.I!- PHONE NO. . 2209 952 9e92 Apr. 17 !997 02:21PM P� hydrocarbons and not gasoline or diesel. The bio-assay conducted on the sample with the highest concentration of petroleum hydrocarbons indicates that the affected soils do not bear the toxicity characteristic of a hazardous waste. Samples from the septic tank contained elevated concentrations of petroleum hydrocarbons. Based on Knowledge of Characteristics, these concentrations are not of the magnitude that would be toxic and constitute a hazardous waste. The balance of the samples collected on the property either had non-detectable or very slightly elevated concentrations of petroleum hydrocarbons. Chlorinated Solvents: No chlorinated solvents were detected in any sample analyzed by EPA method 8240, CONCLUSIONS Elevated levels of lead and petroleum hydrocarbons are present in near surface soils (above 5 feet) on the far northeastern portion of the property. The constituent of concern respecting characterization as a hazardous waste is soluble lead. Based on the negligible lead concentrations at the depth of 5 feet, however, it is likely that the lead is relatively insoluble under actual site conditions (citric acid is used by the laboratory to extract soluble lead). Elevated levels of lead and petroleum hydrocarbons are present in the sludge and liquid within the septic tank. However, neither the liquid or sludge meet the criteria of a hazardous waste. No significant impact by hazardous substances was identified on the balance of the property. RECOMMENDATIONS The septic tank should be pumped out and the contents properly disposed of. Preparatory to remediation, the lateral and vertical limits of significant impact on the northeastern portion of the site should be defined in greater detail. Additional sampling for lead should be conducted to delimit the actual depth of impact (this limit lies somewhere between 1 foot and 5 feet). Additional samples should be collected peripheral to the area of known impact in order to more accurately determine and area and volume of soil to be remediated. The feasibility of onsite treatment for soil should be evaluated. It may be. more protective and more cost effective to chemically and physically stabilize the lead than to remove the material to a Class I Landfill. Bench scale testing may be required.