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Ms Mary Mays February 19, 1993 Page 2 TABLE 1 GROUND WATER ELEVATIONS AND PHYSICAL OBSERVATIONS Monutonng Date Elevation of Depth to Ground Water Well Measured Top of Casm2a Ground Water ft Elevation (ft)a Physical Observations MW-1 09/04/91 9844 946 88 98 No product or sheen 10/13/91 1081 87 63 No product or sheen 10/20/91 11 15 8729 No product or sheen 04/09/92 1493 83 53b 0 03' product 07/10/92 12 88 8556 No product or sheen 01/07/93 1632 82 95b 1 11' product MW-2 09/04/91 9904 10 12 88 92 No product or sheen 10/13/91 11 22 87 82 No product or sheen 10/20/91 11 65 87 39 No product or sheen 04/09/92 1529 83 75 No product or sheen 07/10/92 13 33 85 71 No product or sheen 01/07/93 1599 83 05 No product or sheen MW-3 09/04/91 97 93 8 67 8926 No product or sheen 10/13/91 10 10 87 83 No product or sheen 10/20/91 1062 87 31 No product or sheen 04/09/92 1435 83 58 No product or sheen 07/10/92 12 36 85 57 No product or sheen 01/07/93 1503 8290 No product or sheen a Relative to a temporary bench mark with an assumed elevation of 100 00 feet b Ground water elevation adjusted due to presence of liquid-phase petroleum hydrocarbons using the formula Ground Water Elevation = Reference Elevation - [(Depth to Ground Water) - (Specific Gravity of Product x Product Thickness)] Specific gravity of gasoline is approximately 0 75 Ground Water Sample Analytical Results Due to the presence of liquid-phase petroleum hydrocarbons in monitoring well MW-1 on January 7, 1993, the water was not sampled for chemical analyses Ms Mary Meays of the San Joaquin County Environmental Health Division requested that the domestic water supply well be sampled The sample was submitted to a state-certified laboratory for analysis of concentrations of benzene, toluene, ethylbenzene, and xylenes and total petroleum hydrocarbons as gasoline Laboratory analytical results indicate that petroleum hydrocarbons were not present in the sample at or above the limits of detection Laboratory analytical results are summarized in Table 2 and a copy of the laboratory report is included in Enclosure A