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Soil Suitability Nitrate Loading Study l�err�con <br /> Recreation Vehicle Service Facility■ Lockeford, CA <br /> April 12, 2017■ Terracon Project No. NA177006 <br /> A discussion of regio roundwater, including depth to groundwater and flow gradient is <br /> included in Sectio 1.4. No significant seasonal trends were evident from the sources <br /> consulted. <br /> 2.2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential groundwater contamination is included in Section 1.4.2. <br /> .44), <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. (2.3) <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 industrial facilities in the area may be the most significant sources <br /> of nitrate in groundwater. Septic tank use in the vicinity is discussed in Section 1.3.4. 3 I <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 fall <br /> and evapotranspiration for Lodi, California. The estimate first determines whether the average <br /> monthly precipitation exceeds average monthly potential evapotranspiration. If so, then the <br /> difference is potential deep percolation. This method does not consider runoff, although due <br /> relatively flat nature of the site runoff should be minimal. Refer to Appendix E for the data and <br /> calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Lodi is located within evapotranspiration zone number 12. Average <br /> rainfall was obtained from the Western Regional Climate Center (Station 048560) for the east <br /> Lodi area. <br /> Table 6. <br /> Estimate of Deep Percolation of Rain for the Site <br /> Location Deep Percolation of Rain <br /> Lodi 5.76 inches per year <br /> Based on this method,the average deep percolation of rain for the east Lodi area is estimated to <br /> be 5.76 inches/year. The nitrate concentration of rainfall is estimated to be 1 mg/L-N (Hantzsche <br /> and Finnemore, 1992). <br /> Responsive■ Resourceful ■ Reliable 13 <br />