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W P, - � �`-�'� �i, wgl <br /> r' <br /> December 11, 1991 <br /> Beacon Service Station No. 492, Manteca, California <br /> At the request of Ultramar, Applied GeoSystems began quarterly monitoring of ground <br /> water in monitoring wells 1%4W-1 through �1W-3 in May 1987. Because 0.25 inches free <br /> product was observed in samples of ground water collected from well NJW-1 during the <br /> ded <br /> at <br /> September and December 1988 monitoring events,Applied lt sHearn ontlhly <br /> subjective analyses of ground water and removal off product beperformed <br /> basis (Applied GeoSystems, January 31, 1989. Report No. 86102-3). Results of subjective <br /> analyses are summarized in Table 1. <br /> Since our initial inx estigation in December 1986 and the commencement of quarterly <br /> line <br /> in water <br /> monitoring in May 11$7, detectable concentrations <br /> of hydrocarbons ovhaveabeensbelow the <br /> samples have fluctuated. However, concentrations <br /> Maximum Contaminant Levels (.i41Ci-) as specified in miwells t�1VV-1'fornia Code and i4iW-2 since <br /> o <br /> Regulations, Section 64444.5 in water samples collected f <br /> December 1990. Concentrations of hydrocarbons detected innulait eresults <br /> samples <br /> laboratory <br /> well MW-3 have been below MCLS since June 1988. Cu <br /> analyses of water samples are shown o.i Table 2. <br /> 3 <br /> s6to2-Inv <br />