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TABLE 2 <br />Chronological Groundwater Monitoring Results Summary <br />Well <br />Sample <br />TPH-G <br />Benzene <br />Toluene <br />Ethyl- <br />Xylene <br />Total <br />Fecal <br />Date <br />(mglL) <br />(µglL) <br />(ag/L) <br />benzene <br />(PgIL) <br />Lead <br />coliform <br />(.g/L) <br />(mglL) <br />(MPN/100 ml) <br />MW -1 <br />Aug 1991 <br />ND <br />130 <br />ND <br />ND <br />21 <br />NA <br /><2 <br />Dec 1991 <br />054 <br />270 <br />ND <br />ND <br />37 <br />ND <br />2 <br />Mar 1992 <br />021 <br />50 <br />ND <br />ND <br />ND <br />ND <br />2 <br />Jun 1992 <br />ND <br />ND <br />ND <br />ND <br />ND <br />ND <br /><2 <br />Oct 1992 <br />ND <br />ND <br />ND <br />ND <br />ND <br />0 071 <br />ND <br />Dec 1992 <br />ND <br />ND <br />ND <br />ND <br />ND <br />NA <br />NA <br />MW -2 <br />Aug 1991 <br />ND <br />28 <br />ND <br />ND <br />5 <br />NA <br />2 <br />Dec 1991 <br />41 <br />1900 <br />8 7 <br />ND <br />180 <br />ND <br />27 <br />Mar 1992 <br />051 <br />120 <br />ND <br />ND <br />74 <br />ND <br /><2 <br />Jun 1992 <br />02 <br />ND <br />34 <br />ND <br />8 <br />ND <br /><2 <br />Oct 1992 <br />ND <br />230 <br />3 9 J <br />ND <br />4 5 J <br />0 18 <br />ND <br />Dec 1992 <br />14 <br />440 <br />11 <br />ND <br />14 <br />NA <br />NA <br />MW -3 <br />Aug 1991 <br />ND <br />76 <br />ND <br />ND <br />4 <br />NA <br />6 <br />Dec 1991 <br />041 <br />210 <br />ND <br />ND <br />ND <br />ND <br />17 <br />Mar 1992 <br />052 <br />120 <br />ND <br />ND <br />42 <br />ND <br /><2 <br />Jun 1992 <br />ND <br />ND <br />ND <br />ND <br />ND <br />ND <br />7 <br />Oct 1992 <br />062 <br />ND <br />0 67 J <br />ND <br />ND <br />0 043 <br />ND <br />Dec 1992 <br />ND <br />1 3 <br />ND <br />ND <br />ND <br />NA <br />NA <br />MW -4 <br />Oct 1992 <br />ND <br />ND <br />ND <br />ND <br />ND <br />0 020 <br />ND <br />Dec 1992 <br />ND <br />ND <br />ND <br />ND <br />ND <br />NA <br />NA <br />MW -5 <br />Oct 1992 <br />ND <br />65 <br />ND <br />ND <br />ND <br />0 023 <br />ND <br />Dec 1992 <br />ND <br />3 0 <br />ND <br />ND <br />ND <br />NA <br />NA <br />MW -6 <br />Oct 1992 <br />ND <br />ND <br />ND <br />ND <br />ND <br />0 019 <br />ND <br />Dec 1992 <br />ND <br />ND <br />ND <br />ND <br />ND <br />NA <br />NA <br />ND = <br />Non-detectable <br />above the <br />detection limit <br />of the analysis <br />NA <br />= Not analyzed <br />J = Estimated <br />concentration <br />below <br />level of <br />detection <br />As shown on Table 2, groundwater quality trends at the site indicate that the only compound <br />currently found in significant concentration in groundwater at the site is benzene However, the <br />compound was found only in wells MW -2, MW -3, and the newly installed MW -5 at the <br />southeast corner of the site MW -5 is of particular interest as it is the well monitoring <br />groundwater quality downgradient of the site. While an encouraging decrease in benzene <br />concentration was noted, it is too soon to determine if this is a trend which may indicate MW -5 <br />is the downgradient extent of groundwater impacts apparently associated with the site. <br />During the monitor well sampling, the depth to groundwater was measured in all wells and the <br />data converted to Mean Sea Level (MSL) elevations for the purpose of plotting groundwater <br />gradient and direction at the site Figure 3 presents a graphical interpretation of the data which <br />m%cSRPIsuREG4QTR WP 5 01f26193 <br />