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§eologicafTechnirs Inc. Page 2 Hunter Container Report- Soil and Groundwater Investigation Project No.397.2 October 25, 1996 was reported in 'VHF's January 3, 1996 Preliminary Site Characterization Report of Findings. �:xcruf `'p��ns n ecS�;Y. acty7 Sa '` In addition, WHF mitigated the burn pile and other environmental concerns identified by ERM on the northwest side of the building as reported in their April 23, 1996 report Waste/Burn Pit& Surrounding Area. GTI Assessment Work On June 17, 1996 Geological Technics Inc. (GTI) was contracted to perform additional soil and groundwater investigation of the extent of TCE and other volatile organic compounds released from a drain pipe that discharged to the ground on the northeast side of the factory building. Information gathered during a Phase I ESA suggested that the discharge occurred over several years at a low concentration and a slow rate. Our goal was to investigate the soil deeper then 10 feet and to investigate if groundwater has been impacted. On September 30, 1996, GTI and V&W Drilling drilled four soil boreholes to 30 feet (depth to groundwater)and installed one groundwater monitoring well in one of the borehole. ` Subsurface Soils Soil samples were collected and tested for petroleum hydrocarbons and chlorinated solvents. Elevated concentrations of petroleum hydrocarbons (i.e., TPH-G, TEPH-D & MO, and BTEX) were found in the soil below about 5 to 12 feet. However, no volatile organic compounds (i.e., halogenated solvents) were detected. Because matrix effects and/or other factors (e.g., elevated concentrations of petroleum hydrocarbons contained in the soil) required additional sample dilution, the reporting limits for the halogenated solvent samples have been raised. This may account for the non detect levels reported in these samples collected by GTI since the concentrations of volatile organic compounds found by ERM were below most of the elevated detection limits. The practical quantitation limit for TCE ranged from 0.060 up to 30 mg/kg, with most of then at 6.0 mg/kg. ' Groundwater from MW-1 Groundwater level is at 30 feet below grade and the water in the well shows evidence of a thin layer of third phase product floating on the water table. A groundwater sample from MW-1 was collected and tested for purgeable and extractable petroleum hydrocarbons, and _ halogenated solvents. Test results show elevated concentrations of purgeable petroleum hydrocarbons, low concentrations extractable petroleum hydrocarbons, and no volatile organic compounds (i.e., halogenated solvents). Because matrix effects and/or other factors (e.g., elevated concentrations of petroleum hydrocarbons contained in the groundwater) required additional sample dilution, the reporting limits for the halogenated solvent sample have been raised. Septic Tank Water A sample of the septic tank water (second chamber) was collected and tested for purgeable and extractable petroleum hydrocarbons, halogenated solvents, and CAM 17 metals. The septic tank sample results show low concentrations of purgeable and extractable petroleum hydrocarbons, trace amounts of three metals (chromium, copper, & zinc), and no volatile organic compounds (i.e., halogenated solvents). Because matrix effects and/or other factors required additional sample dilution, the reporting limits for the halogenated solvent sample have been raised.