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QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW <br /> 4614 W TURNER RD , LODI <br /> PAGE 3 <br /> Only Monitoring Wells 1 and 2 showed indications of any contamination. <br /> MW-1 2 6 ppb Benzene and 3 1 ppb Ethylbenzene TPHg was ND This well <br /> showed no contaminants for the first two quarters of 1995 However, prior to <br /> 1995, it has shown some level of contaminant due to its proximity to the site of <br /> the former tank The levels remain very low, indicating the persistence of an <br /> extremely small residual contamination <br /> MW-2 50 ppb TPHg This is an unusual reading MW-2 has shown no <br /> contaminants since the tank was removed in 1989, except once in the first <br /> quarter of 1992 when it showed 70 ppb TPHg This most recent reading may <br /> be a similar erratic appearance not indicative of any plume migration. MW-2 <br /> will be tested in the next round of sampling <br /> Monitoring wells 3, 4, 5, 6, 7, 8, and 10 were ND for all contaminants tested This is <br /> consistent with the last five years, there has been no indication of a spreading or <br /> migrating plume <br /> Summary <br /> • In the spring of 1995, water levels rose to within two feet of the bottom of the former <br /> tank Any significant amounts of soluble contaminants in the soil would have <br /> appeared in the water tests from the second and third quarter Two quarters of ND in <br /> the wells closest to the site, and the extremely low readings in MW-1 and MW-2 this <br /> quarter, accompanied by ND in all other wells, indicates the persistence of an <br /> extremely small residual contamination This contamination poses no threat to human <br /> or environmental health, and is very likely to completely bioremediate in the next few <br /> years <br /> Sebastiani Vineyards is in the process of contracting with an engineer to develop a <br /> closure report for the site We will continue to monitor on a quarterly basis until the <br /> site is closed or a different monitoring schedule is approved <br /> I can be reached at (209) 339-1311 with any questions or comments you may have <br /> related to this project <br /> Yours truly, <br /> SEBASTIANI VINEYARDS <br /> . J Step n Manildi <br />