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Phase IIA Environmental Site Assessment Page 9 <br /> Former Karlson Trucking Property <br /> Project No. 191.2 <br /> October 28, 1998 <br /> With the exception of a trace amount of xylene (0.4 µg/L) in the groundwater <br /> collected from SB-1, no petroleum hydrocarbons were detected in the area of the <br /> gate entrance. This xylene is interpreted as cross contamination during <br /> sampling or drilling. <br /> Seepage Pit <br /> The low levels of dielectric oil in SB-7 (352 µg/L) and the lack of field evidence <br /> suggesting the presence of petroleum hydrocarbons may indicate that the oil in <br /> the sample, SB-7 may be from cross contamination of the sample from drilling <br /> equipment. The levels of contaminant metals were at or above MCL (Maximum <br /> Contaminant Level) limits for drinking water for Chromium, Lead, Nickel and <br /> Zinc. It is not known at this time if this is representative of groundwater in the <br /> vicinity of the seepage pit. <br /> 4.2 Recommendations <br /> Based upon the conclusions outlined above, which in turn are based upon <br /> evidence obtained during the Phase IIA Environmental Site Assessment, the <br /> following recommendations are made: <br /> Soil Stockpile <br /> No further action is recommended to investigate the soil stockpile. <br /> Pole Barn <br /> No further action is recommended to investigate the soil staining in the floor of <br /> the pole barn. <br /> Tank Location-Entrance <br /> No evidence was found to suggest that the suspected tank(s) located here may <br /> have leaked to impact groundwater. No further action is recommended to <br /> investigate this tank location. <br /> Tank Location-Between Pole Barn & Shop Building <br /> It appears that dielectric oil has been released to the subsurface in the area <br /> between the pole barn and former wash rack. It is recommended that the <br /> owners of the Property report the release to the San Joaquin County Public <br /> Health Service / Division of Environmental Health. It is anticipated that this <br /> agency will direct the owners to begin an investigation program to quantify the <br /> contamination and ultimately mitigate this environmental condition. <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0295 <br />