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VVZI INC <br /> 46 as gasoline, benzene and xylene In groundwater samples collected from the monitoring <br /> wells are plotted with units that are ug/l versus time Other petroleum hydrocarbon <br /> constituents were not graphed for the individual monitoring wells because their <br /> concentrations were reported as below analytical method detection limits A tabulated <br /> summary of each of the petroleum hydrocarbon constituent concentrations as determined <br /> by analytical laboratory results from groundwater samples is presented below <br /> Total Petroleum Hydrocarbon as Gasoline <br /> Monitoring Well Maximum Constituent Concentration /l Concentration (u_g_ll) <br /> and Date August 1996 <br /> MW-1 6,800 August 1990 ND <br /> MW-3 3,000 May 9989 ND <br /> MW-6 3,000 May 1989 ND <br /> MW-8 47 May 1989 ND <br /> MW-10 340 September 1991 ND <br /> Benzene <br /> Monitoring Well Maximum Constituent Concentration If Concentration ll <br /> and Date Aust 1996 <br /> MW-1 520 May 1991 43 <br /> MW-3 240 May 1990 ND <br /> MW-6 240 May 1989 ND <br /> MW-8 47 May 1990 ND <br /> MW-10 11 May 1991 ND <br /> Xylene <br /> Monitoring Well Maximum Constituent Concentration (ugli) Concentration (ag1l) <br /> and Date August 1996 <br /> MW-1 670 May 1990 ND <br /> MW-3 62 May 1990 ND <br /> MW-6 56 May 1989 ND <br /> MW-8 25 May 1990 ND <br /> MW-10 12 May 1991 ND <br /> The concentrations of petroleum hydrocarbon constituents depicted in the above table <br /> diminish rapidly with time All monitoring wells were reported to contain petroleum <br /> hydrocarbon constituents below analytical laboratory detection limits since May 1994, <br /> 19150011 005 28 <br />