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Bail Bond Business Page 9 of 13 <br /> Our Project Number: LGS080549 <br /> January13, 2009 <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 I.4.11 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 /> I.4.2. <br /> 2.2.3 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 vicinity appears to use a <br /> public water supply. <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 significa�n sources of <br /> nitrate in ground water. Septic tank use in the vicinity is discussed in Section I.3.'$! <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 Manteca, California. The estimate first determines whether the <br /> average monthly precipitation exceeds average monthly potential evapotranspiration. If so, then <br /> the difference is potential deep percolation. This method does not consider runoff. See Plate 9 <br /> for the data and calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Manteca is located within evapotranspiration zone number 12. <br /> Average rainfall was obtained from the Western Regional Climate Center (Station 048558). <br /> Based on this method, the average deep percolation of rain for the Manteca area is estimated <br /> to be 3.54 inches. The nitrate concentration of rainfall was estimated to be 1 mg/L-N <br /> (Hantzsche and Finnemore, 1992). <br /> 2.3.3 Current On-Site Sources of Nitrate <br /> There are no cu ent on-site sources of nitrate except for natural processes. ' <br /> 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 ©1008 Neil O.Anderson&Associates,Inc <br />