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r - � <br /> ,. <br /> Rli <br /> ME <br /> October 13, 1987 AGS 87050-2 <br /> USA Station No. 65, Lodi, California <br /> DISCUSSION <br /> The laboratory results of soil samples indicate nondetectable <br /> concentrations of total fuel hydrocarbons and hydrocarbon <br /> constituents benzene, toluene, ethylbenzene, and total xylene <br /> isomers. These results corroborate. the very low organic vapor <br /> analyzer readings of coil samples and cuttings from the three <br /> boreholes. The. results also svggest. that soil hydrocarbon <br /> contamination of the soil is likely to be relatively restricted <br /> to the area beneath the underground storage tanks and in <br /> particular, to the area near ground-water monitoring well S-1. <br /> Luboratory results of water analyses indicate nondetectable :to <br /> relatively low concentrations of hydrocarbons. Concentrations of <br /> total volatile hydrocarbons are less than 0.1 ppm and a <br /> nondetectable concentration (i.e. , less than 1.0 ppm) of total <br /> fuel hydrocarbons was found in water from well MW-1. Concen- <br /> trations of benzene in wells MW-1 and MW-2 and concentrations of <br /> toluene, ethylbenzene, and total xylene isomers in wells MW-1 <br /> through M1-3 are less than the maximum concentrations that are <br /> recommended for drinking water by the State of California <br /> -._.. _.-._._Department-.of-:-Health.services_----The-benzene-concentration -found -- --- <br /> in MW-3 is 2.7 parts per billion, which exceeds:the recommended <br /> U <br /> maximum concentration for drinking water of 0.7 part.per.billion. <br /> r' 19 <br /> w <br /> .4PP/ietY r'�O.Sysf�e�s <br /> MI Mon— <br />