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r � a, may, �_,��,��, ,� �t �a�,��..��.. g� ��.,�.�. �� ,�'-....� �. �� -• �=� '; �r '� ��` SIR e. Quarterly Ground-Water Monitoring October 19, 1989 Beacon Station No, 492, Manteca, California AGS $6102-4 TABLE 2 CUMULATIVE RESULTS OF LABORATORY ANALYSES OF GROUND WATER SAMPLES Beacon Station No. 3-492 470 North Main Street Manteca, California well Number Ethyl-- Total and Date Benzene Toluene benzene. Xylenes TPH TVH 1�W-1 12/04/86 0,077 0.024 0.145 0.0569 NA 7, 297 05/14/87 0.158 0.143 0.305 1.430 NA 17.73 ' 01/15/88. 0.005 0.088 0.055 0.376 2.49 NA 06/07/88 0.12 1.86 0.66 4.50 21.60 NA 09/06/88 NA NA NA NA NA NA 12/05/88 NA NANA NA NA N:a 03/02/89 0.026 0.025 0.015 0.272 6.3 NA 07/20/89* <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 NA � r Mw-2 1. 12/04/86 0.054 0.132 0.062 0.829 NA 1.829 05/14/87 0.725 3.086 0.497 4.475 NA 17.495 2 01/15/88 0.031 0.068 0.006 0.264 11.60 NA 06/07/88 0.015 0.200 0.044 0.310 1.26 NA 09/06/88 0.0015 0,001 <0.0005 0.0063 0.03 NA F 12/05/88 0.0014 <O.0005 <0.0005 0.0035 0.04 NA 03/02/89 <0.0005 <O.0005 <0.0005 <0.001 0.06 NA t 07/20/89* <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 NA i XW-3 12/04/86 <0.001 0.004 <0.001 0.008 NA 0.034 05/14/87 0.0021 0.0053 0.0015 0.0114 NA 0.119 Ol/14/t38 0.0027 0.0106 0.0024 0.0252 0.100 NA f 06/07/88 0.003 0.035 0.023 0.151 i.17 NA 09/06/88 <0.0005 <0.0005 <0.0005 <0.0005 <0.02 NA 12/05/88 <0.0005 <0.0005 <0.0005 <0.0005 <0.02 NA .03/02/89 <0.0005 <0.0005 <0.0005 0.004 0.05 NA 07/20/89* <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 NA Concentrations given in parts per million -- TVH-=--Total-volatile-hydrocarbons - - - --- - TPH a 'Total petroleum. hydrocarbons as gasoline * = Chlarobenzene and 1,4-dichlorobenzene were analyzed and were below the detection limit (O.Uoo5 ppm) NA Not analyzed