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Phase IIA Environmenta..jite Assessment Page 8 Former Karlson Trucking Property Project No. 191.2 October 28, 1998 4.0 CONCLUSIONS & RECCOMENDATIONS 4.1 Conclusions The conclusion presented below are based on an interpretation of the data collected during the completion of the assessment. Soil Stockpile Low levels of motor oil range organics were detected in the composite soil samples collected from the soil stockpile. No volatile organic compounds were detected in the two composite samples. Non-detectable or background levels of metals were present in the two composite soil samples. Given that the contaminant oil levels are low, and that there were no detectable volatile organics and background levels of metals, and noting that motor oil is relatively insoluble, this would suggest that the stockpile material is unlikely to pose a threat to impact groundwater. Pole Barn The shallow soil samples collected from two feet beneath the ground surface of the pole barn contained low detectable levels of petroleum hydrocarbons and non-detectable to background levels of contaminant metals. The samples collected from six feet below ground surface contained non-detectable levels of petroleum hydrocarbons and background levels of metals. It appears that only shallow soils in the area of the pole barn are impacted by low levels of petroleum hydrocarbons and if the deep samples are characteristic of the deeper soils beneath the pole barn, this suggests that the surface contamination is confined to the upper 1-3 feet of soil. Former Suspected Underground Storage Tank Locations Detectable dielectric oil range petroleum hydrocarbons were present in the soil and groundwater samples collected from four borings on the site. Water samples from SB-4, 5, 6, & 7 contained detectable levels dielectric oil. Soil samples from boring SB-4, 5 & 6 also contained detectable levels of dielectric oil. The lack of field evidence and measurable OVM readings in the shallow samples (4-6') from borings SB-4, 5 & 6 suggest that the borings were completed off to the side of the point of a surface release or from (one of) the suspected underground storage tank(s) in the general vicinity of these borings. If the borings had been drilled through the point of release and the release was from the surface, it is anticipated that the shallow soil samples would also have both field and/or laboratory detectable hydrocarbon contamination. 2937 Veneman Ave.,#B240 Ceo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 95356 Fax(209) 569-0295