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