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Traylor Shea Precast Page 9 of 14 <br /> Our Project Number: E0711lIfB <br /> November 29, 2007 <br /> 11.1.2 Mass Transport Soil Properties <br /> The percolation tests have revealed that the soils are fairly permeable. These soils will allow <br /> moderate to rapid infiltration of water through the surface soils. The longer the effluent remains <br /> .. near the surface, the more treatment is enhanced due to natural processes within the soil. If <br /> the permeable soils exist to the depth of the ground water table, it is possible that surface <br /> contaminants may be transported fairly rapidly. <br /> II.2 Ground Water Analysis <br /> ,. II.2.1 Reoional Ground Water <br /> A discussion of regional ground water, including depth to ground water and directional ground <br /> water gradient, is included in Section I.4.1. No significant seasonal trends were evident from (Z <br /> the maps consulted. <br /> ` II.2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential ground water contamination is included in Section <br /> I.4.2. <br /> II.2.3 Current and Future On-Site Ground Water Uses <br /> There are currently no wells on the Site, as noted in Section I.4.3. The site plan indicates a (z 3� <br /> domestic well will be located at the southwest corner of the Site. <br /> II.3 Sources and Impact of Nitrate to Groundwater <br /> L II.3.1 Current Off-Site Sources of Nitrate <br /> Septic systems, agriculture, and dairies in the area may be the most significant sources of (3./ <br /> nitrate in ground water. Septic tank use in the vicinity is discussed in Section I.3.4. <br /> II.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 North Stockton, California. The estimate first determines <br /> ` whether the average monthly precipitation exceeds average monthly potential <br /> evapotranspiration. If so, then the difference is potential deep percolation. This method does <br /> not consider runoff. See Plate 9 for the data and calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Stockton is located within evapotranspiration zone number 12. <br /> Average rainfall was obtained from the Western Regional Climate Center (Station 048560). <br /> 6. 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02007 Neil O.Anderson&Associates,Inc <br />