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TABLE 1-Continued GROUND WATER LEVEL DATA Exxon Retail Station No. 7-3330 3128 West Benjamin Holt Drive Stockton, California Monitoring Top of Riser Depth to Ground Water Well Date Elevation MY Water ft Elevation(ft) Observations MW-5 06/19/91 0.32 14.31 -13.99 NA • 09/25/91 15.67 -15.35 NA 12/26/91 14.52 -14.20 NA 01/21/92 14.15 -13.83 NA 03/26/92 12.39 -12.07 NA 06/27/92 15.12 -14.80 NA 09/25/92 16.25 -15.93 No LPH or sheen 11/16/92 15.59 -15.27 No LPH or sheen 04/05/92 10.42 -10.10 No LPH or sheen 09/07/93 12.21 -11.89 No LPH or sheen 11/18/93 12.81 -12.49 No LPH or sheen 02/10/94 11.74 -11.42 No LPH or sheen 05/31/94 11.29 -10.97 No LPH or sheen 08/30/94 12.91 -12.59 No LPH or Sheen 11/22/94 13.03 -12.71 No LPH or sheen 02/16/95 10.74 -10.42 No LPH or sheen • 03/31/95 8.42 -8.10 No LPH or sheen 04/21/95 8.56 -8.24 No LPH or sheen 06/01/95 9.32 -9.0 No LPH or sheen MW-6 06/19/91 0.02 14.05 -14.03 NA 09/25/91 11.29 -15.46 NA 12/26/91 15.48 -14.27 NA 01/21/92 14.29 -13.88 NA 03/26/92 13.90 -12.46 NA 06/27/92 12.48 -14.89 NA 09/25/92 14.91 -16.02 No LPH or sheen 11/16/92 16.04 -15.38 No LPH or sheen 04/05/92 15.40 -10.06 No LPH or sheen 09/07/93 10.08 -12.02 No LPH or sheen 11/18/93 12.04 -12.42 No LPH or sheen 02/10/94 12.44 -11.53 No LPH or sheen 05/31/94 11.10 -11.08 No LPH or sheen 08/30/94 12.74 -12.72 No LPH or sheen 11/22/94 12.75 -12.73 No LPH or sheen 02/16/95 10.59 -10.57 No LPH or sheen Well risers have been surveyed relative to mean sea level. " Not available. Liquid-phase hydrocarbons. NOTE: Ground water levels prior to September 25, 1992,by Artesian Environmental Consultants. Ground water levels from September 25, through November 16, 1992, by Resna Industries t.RP660.TA