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January 16,2007 <br /> NOA Project Number: E07009A <br /> 2.3 Current and Future On-Site Ground Water Uses <br /> There are currently no wells on the site, as noted in Section 4.3 of the SSS. <br /> 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> 3.1 Current Off-Site Sources of Nitrate <br /> Septic systems,agriculture, and dairies in the area may be the most significant sources of nitrate in <br /> ground water. Septic tank use in the vicinity is discussed in Section 3.4 of the SSS. <br /> 3.2 Contribution of Rainfall <br /> ' An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. The <br /> estimate of deep percolation of rain is based on the average monthly precipitation of rain fall and <br /> evapotranspiration for Stockton, 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. See Plate 1 for the <br /> {, data and calculation. <br /> I <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 048558). <br /> Based on this method, the average deep percolation of rain for the Stockton area is estimated to be <br /> 4.0 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche and <br /> Finnemore, 1992). <br /> 3.3 Current On-Site Sources of Nitrate <br /> There are no current on-site sources of nitrate except for natural processes. <br /> 3.4 Future On-Site Sources of Nitrate <br /> 3.4.1 Quantity and Quality ofDomestic Wastewater From Proposed Project <br /> i <br /> The following discussion is for determining the long-term waste water flow generated from the <br /> proposed gas station and commercial building for the nitrate loading analysis and.should not be used for <br /> septic system design purposes. Typically, use estimates fat the sizing of septic systems include a peak use <br /> factor,whereas the numbers discussed here are based on long-term averages. The proposed <br /> development on the subject property includes the construction of a 5,250 square foot commercial <br /> ' building and a gas station and convenience store. <br /> 4 <br />