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Ms Mary Meays May 7, 1993 Page 2 TABLE I GROUND WATER ELEVA'T'IONS AND PHYSICAL OBSERVATIONS Monitoring Date Elevation of Depth to Ground Water Well Measured Ton of Casine Ground Water (ft) Elevation (ft)" Physical Observations MW-1 09/04/91 9844 946 88 98 No product or sheen 10/13/91 10 81 8763 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 16 32 82 95b 1 11' product 04/07/93 1558 8290 11' product MW-2 09/04/91 9904 10 12 8892 No product or sheen 10/13/91 1122 87 82 No product or sheen 10/20/91 1165 87 39 No product or sheen 04/09/92 1529 83 75 No product or sheen 07/10/92 13 33 8571 No product or sheen 01/07/93 1599 8305 No product or sheen • 04/07/93 1620 82 99b 2' product 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 1236 8557 No product or sheen 01/07/93 1503 8290 No product or sheen 04/07/93 15 10 8283 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 On April 7, 1993, a ground water sample was collected from monitoring well MW-3 Due to the presence of liquid-phase petroleum hydrocarbons in monitoring wells MW-1 and MW-2, ground water samples were not collected 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 at or above the limits of detection in the samples collected from monitoring well MW-3 or the domestic water supply well Laboratory analytical results are summarized in Table 2 and a copy of the laboratory report is included in Enclosure A