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• <br /> June 26, 1992 <br /> . ARCO Service Station No. 549, Stockton, California <br />• <br /> WORK IN PROGRESS <br /> k �i vaporextraction-test.utilizing­the-three vapor-extraction wells was.,performed,on,Marcli <br /> ,tes�. erformed to..evaluate -vapor extraction-.,as.-a soil...remediatiosi <br /> alternative-. The report describing--the-test,procedures-and .results.will.be submifted_to7 <br /> 5ARCO under separate cover. <br /> __--- -- <br /> Based on the benzene and xylene concentrations detected in ground-water samples collected <br /> from monitoring well MW-1, a quarterly ground-water monitoring program will be initiated <br /> in the first quarter of 1992. <br /> LIMITATIONS <br />. This report was prepared in accordance with generally accepted standards of environmental <br /> geological practice in California at the time this investigation was performed. This <br /> investigation was conducted solely to evaluate environmental conditions of the soil and <br /> ground water with respect to hydrocarbons identified in soil during previous work. No soil <br /> engineering or geotechnical recommendations are implied or should be inferred. Evaluation <br /> of the geologic conditions at the site for the purpose of this investigation is made from a <br /> limited number of observation points. Subsurface conditions may vary away from the data <br /> points available. Additional work,including further subsurface investigation, can reduce the <br /> inherent uncertainties associated with this type of investigation. <br /> • -VW4-4 11 <br />