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Watts Winery O%w ...W Page 9 of 14 <br /> Our Project Number: LGS090507 <br /> May 11, 2009 <br /> 2.1 Chemical and Physical Properties of Soil <br /> 2.1.1 Chemical and Physical Soil Properties <br /> For a discussion of on-site soil properties, refer to Section I.5. <br /> 2.1.2 Mass Transport Soil Properties <br /> The percolation tests have revealed that the soils are permeable. These soils will allow slow to <br /> moderate infiltration of water through the surface soils. The longer the effluent remains near <br /> the surface, the more treatment is enhanced due to natural processes within the soil. If the <br /> permeable soils exist to the depth of the ground water table, it is possible that surface <br /> contaminants may be transported fairly rapidly. <br /> 2.2 Ground Water Analysis <br /> 2.2.1 Regional Ground Water <br /> _ A discussion of regional ground water, including depth to ground water and directional ground <br /> water gradient, is included in Section 1.4.1. No significant seasonal trends were evident from <br /> the maps consulted. <br /> 2.2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential ground water contamination is included in Section <br /> 1.4.2. <br /> 2.2.3 Current and Future On-Site Ground Water Uses <br /> There currently are two wells on the site, 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 ground water. Septic tank use in the vicinity is discussed in Section I.3.4. <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 /> i <br /> �' 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02009 Neil O.Anderson&Associates.Inc <br />