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Odyssey Landscape—Nitrate Loading Section Page 10 of 14 <br /> Our Project Number: NA157000 <br /> March 17, 2015 <br /> natural processes within the soil. If the permeable soils exist to the depth of the groundwater <br /> table, it is possible that surface contaminants may be transported fairly rapidly. <br /> 2.2 Groundwater Analysis <br /> 2.2.1 Regional Groundwater <br /> A discussion of regional groundwater, including depth to groundwater and flow gradient is <br /> included in Section 1.4.1. No significant seasonal trends were evident from the maps consulted. �Z <br /> 2.2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential groundwater contamination is included in Section (-2- <br /> 1.4.2. <br /> 2.2.3 Current and Future On-Site Ground Water Uses <br /> There is currently one well on the site, used to supply drinking water, as noted in Section 1.4.3. <br /> 2.3 Sources and Impact of Nitrate to Groundwater <br /> 2.3.1 Current Off-Site Sources of Nitrate <br /> Septic systems, agriculture, and dairies in the area may be the most significant sources of <br /> nitrate in groundwater. Septic tank use in the vicinity is discussed in Section 1.3.4. C3'� <br /> 2.3.2 Contribution of Rainfall <br /> An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. <br /> The estimate of deep percolation of rain is based on the average monthly precipitation of rain <br /> fall and evapotranspiration for Lodi, California. The estimate first determines whether the <br /> average monthly precipitation exceeds average monthly potential evapotranspiration. If so, <br /> then the difference is potential deep percolation. This method does not consider runoff. See <br /> Plate 7 for the data and calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Lodi is located within evapotranspiration zone number 12. <br /> Average rainfall was obtained from the Western Regional Climate Center (Station 045032) for <br /> the West Lodi area. <br /> ry Table 3. <br /> Estimate of Deep Percolation of Rain for the Site <br /> Location Deep Percolation of Rain <br /> Lodi 5.29 inches <br /> ©2015 Neil O.Anderson&Associates,Inc. <br /> A Terracon Company <br />