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• August 5, 1988 AGS Job No. 38033-1 <br /> Marlowe Properties, Stockton, California <br /> 1 <br /> RESULTS AND DISCUSSION <br /> No subjective evidence (OVA readings) of contamination was noted <br /> in boring B-1 to total depth of 34 feet below grade. The soil <br /> sample collected and analyzed from 30 feet below grade showed no <br /> detectable hydrocarbons. SubDecti.ve evidence of contamination was <br /> noted in boring B-2 beginning at 30 feet below grade. The highest <br /> OVA readings (624 ppm) were acquired from the soil sample <br /> collected from approximately 45 feet below grade. Chemical <br /> analyses of this soil sample showed TPH levels of of 3 . 4 ppm. <br /> Chemists from both laboratories noted a high peak during analysis <br /> and a slightly different odor suggesting that an organic compound <br /> or compounds other than gasoline may be present in the subsurface. <br /> Chemical analyses of the soil sample immediately above ground <br /> water level revealed low levels of total xylene isomers. <br /> Chemical results of the ground-water sample collected from <br /> monitoring well MW-1 indicates that ground-water contamination has <br />` occurred. Levels of benzene were found to be in excess of <br /> acceptable levels recommended for drinking water established by <br /> the California Department of Health Services (0. 0007 ppm) . The <br /> geologist also noticed a moderate obvious product odor when <br /> collecting the ground-water sample. <br /> 13 <br /> Applied GwSystems <br />