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July 5, 2005 <br /> NOA Project Number: E05027A <br /> 3.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential ground water contamination is included in Section 4.2 of <br /> the SSS. <br /> 3.3 Current and Future On-Site Ground Water Uses <br /> Yr A description of the existing wells on the Site is included in Section 4.3 of the SSS. Ground water is <br /> currently not used on the property. If the property is developed it is possible that the well will be <br /> rendered operable or a new well would be installed and the old well abandoned. These decisions <br /> 6. will be made by the new property owner. <br /> 4.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> 4.1 Current Off-Site Sources of Nitrate <br /> Septic systems,agriculture,and dairies in the area may be the most significant sources of nitrate <br /> contamination in ground water. Septic tank use in the vicinity is discussed in Section 3.4 was found <br /> to be fairly high please see that section f9z/m9Fetetaik,,No well was available for water sampling. <br /> The depth to ground water was found to 110 to 120 fee below the ground surface. <br /> A database of nitrate concentrations in water wells was examined at the San Joaquin County <br /> Environmental Health Department on June 29,2005 with the assistance of Linda Turkatte. The <br /> data base was examined for nitrate levels near the subject site. The database search indicated not <br /> much data was available near the site. Though the available information for the area was minimal, <br /> two of the closest wells did not indicated elevated nitrates. <br /> 1. 4.2 Contribution of Rainfall <br /> t An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. The <br /> estimate of deep percolation of rain is based on the average monthly precipitation of rain fall and <br /> evapotranspiration for Lodi,California.The estimate first determines whether the average monthly <br /> precipitation exceeds average monthly potential evapotranspiration. If so, then the difference is <br /> ` potential deep percolation. This method does not consider runoff. See Plate 9 for the data and <br /> calculation. <br /> i <br /> ` Average precipitation was obtained from the Western Regional Climate Center.The data for the <br /> Lodi Station (#045032) is available from July 1948 to September 2004. <br /> ` Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS) Zone 12. <br /> 3 <br />