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Groundwater Quality Monitoring - 152 East I lth Street, Tracy Page 6 <br /> The 1,700lig/liter concentration of total petroleum hydrocarbons in the sample recovered <br /> from interior well NAV-4 on September 3rd , 1994 is slightly lower than the 1,800pg/liter <br /> measured in the sample recovered from that well on February 25th , 1994 (Ref Table 4) <br /> The concentrations of benzene, toluene and ethyl benzene in the sample recovered `on <br /> September 3rd 1994 were also reduced modestly compared to those in the sample <br /> recovered on February 25th , 1994 although there was a slight increase in the <br /> concentration of total xylenes <br /> Examination of the data compilation presented in Table 4 shows that, while there have <br /> been seasonal variations in the concentrations of components of hydrocarbon fuels in the <br /> groundwater, there has been a significant net reduction in the concentration of <br /> contaminants in the groundwater since contamination of the subsurface at this site was <br /> first discovered and the trend of declining contaminant concentrations with time is <br /> continuing <br /> REFERENCES <br /> I The San Joaquin Company Inc 1994(x) Correct tvt.Action Plan - 152 East I I th. <br /> Street. Tracy- Califorma June 1994 <br /> 2 The San Joaquin Company Inc 1994(b) Ciroundwater Quality <br /> February 25th 1.994 - 152 East 11th Street_ Tracy, California March 1994 <br /> 3 The San Joaquin Company Inc 1993(a) Quarterly Status and Monitoring Report. <br /> August I to October31. 199 - 152 East 1 Ith Street, Tracy, California. November 1993 <br /> 4 The San Joaquin Company Inc 1993(b) Extended Investigatioa of Groundwater <br /> $ treet. Tracy, California July 1993 - <br /> 5 The San Joaquin Company Inc 1993(c) Groundwater Sampling Plan - <br /> 152 East I ltb Street,.Tracy, May1993 <br />