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1 '. September 28, 1992 Working To Restore Nature 1 Beacon Station No 492, Manteca, Califorrua TABLE 3 CUMULATIVE RESULTS OF LABORATORY ANALYSES OF GROUND-WATER SAMPLES Beacon Station No. 492 470 North Main Street Manteca, California (page 3 of 3) Well Number Ethyl- Total and Date Benzene Toluene benzene Xylenes TPHg TPHd MA-3 12/04/86 <0 . 001 0 . 004 <0. 001 0. 008 0 . 034* NA 05/14/87 0 . 0021 0 . 0053 0. 0015 0. 0114 0. 119* NA 01/14/88 0 . 0027 0 . 0106 0. 0024 0. 0252 0 . 100 NA 06/07/88 0 . 003 0 . 035 0. 023 0 . 151 1 . 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. 050 NA 10/11/89 <0 . 0005 <0 . 0005 <0. 0005 <0. 0005 <0. 050 NA ` 12/13/89 <0 . 0005 <0 . 0005 <0. 0005 <0. 0005 <0 . 050 NA 03/06/90 <0 . 0005 0 . 0009 <0. 0005 0. 0011 <0 . 050 NA 09/27/90 <0 . 0005 <0 . 0005 <0 . 0005 <0. 0005 <0 . 050 <0. 050 12/18/90 <0. 0005 <0 . 0005 <0 . 0005 <0. 0005 <0 . 050 NA 03/29/91 <0. 0005 <0 . 0005 <0 . 0005 <0. 0005 <0 . 020 NA 06/21/91 <0. 0005 <0. 0005 <0. 0005 <0. 0005 <0. 050 NA 10/01/91 <0 . 0005 <0 . 0005 <0. 0005 <0. 0005 <0. 050 NA 12/13/91 <0 . 0005 <0 . 0005 <0. 0005 <0. 0005 <0. 050 NA 02/26/92 <0 . 0005 <0 . 0005 <0. 0005 <0. 0005 <0 . 050 <0. 1 07/13/92 <0 . 0005 <0 . 0005 <0 . 0005 <0. 0005 <0 . 050 <0. 050 MW-4 02/26/92 <0 . 0005 <0 . 0005 <0. 0005 <0 . 0005 <0 050 <0 . 1 07/13/92 <0 . 0005 <0 . 0005 <0. 0005 <0. 0005 <0. 050 <0 . 050 Concentrations given in parts per million TPHg = Total petroleum hydrocarbons as gasoline * = Total volatile hydrocarbons TPHd = Total petroleum hydrocarbons as diesel NA = Not analyzed 0731kear 86FD2-8