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I <br />' Beacon Cardlock Station Number 610 SSB 92-1001-02 <br /> 3300 Waterloo Road Page 9 <br /> Stockton, California <br /> 5 0 CONCLUSIONS <br /> On the basis of our findings, we present the following conclusions <br /> 1) Based on the analytical results, it does not appear that soil has been impacted in the <br /> areas penetrated by the soil borings drilled during this investigation Previous <br /> sampling in March of 1987 indicated no detectable concentrations of benzene and <br /> ethylbenzene, and only minor amounts of other analytes <br /> 2) Laboratory analyses of ground-water samples obtained from monitoring well MW-5 <br />' on April 1, 1993, indicated trace concentrations of toluene and xylenes slightly above <br /> the method detection limits These concentrations may have been due to surface <br /> runoff from rainfall during well construction penetrating the boring Monitoring <br /> rwell MW-5 was resampled on April 16, 1993 No detectable gasoline range <br /> hydrocarbon concentrations were detected in the ground-water resample. <br /> 6 0 RECOMMENDATIONS <br />' On the basis of our findings and review of previous site findings, we present the following <br /> recommendations. <br /> 1) Based on the analytical data collected in this and the previous investigation (1987), <br />' we do not recommend further investigation of the soil The three monitoring wells <br /> should be sampled for two additional quarters If the three monitoring wells remain <br /> unaffected by gasoline range hydrocarbons, further investigation or remediation of <br /> the ground water would not be warranted, and site closure should be sought. <br />' SSB ENVIRONMENTAL CONSULTANTS, INC <br />