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�j Bird Road Facility Page 9 of 13 <br /> Project Number: E07183A <br /> November 30, 2007 <br /> l ; <br /> II.2.3 Current and Future On-Site Ground Water Uses <br /> PThere is currently one well on site, as noted in Sectio L4.3. Ground water will be developed <br /> and used on the site for the commercial property. <br /> II.3 Sources and Impact of Nitrate to Groundwater <br /> �j II.3.1 Current Off-Site Sources of Nitrate <br /> i1 <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 /> 11.3.2 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 /> nd evapotranspiration for Tracy, California The estimate first determines whether the <br /> era monthly precipitation exceeds average monthly potential evapotranspiration. If so, <br /> then th difference is potential deep percolation. This method does not consider runoff. See <br /> Plate 9 r the data and calculation. <br /> F1 <br />' Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Tracy 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 Tracy area is estimated to <br /> be 2.52 inches. The nitrate concentration of rainfall was estimated to be 1 mg/L-N (Hantzsche <br /> ! _ and Finnemore, 1992). <br /> II.3.3 t On-Site Sources of Nitrate <br /> i J <br /> The re no c rrent on-site sources of nitrate except for the existing septic system and natural / <br /> proce es. <br /> II.3.4 Future On-Site Sources of Nitrate <br /> FJ11.3.4.1 Quantity and Quality of Domestic Wastewater from Proposed Project <br /> �j The following discussion is for determining the long-term waste water flow generated from the <br /> } proposed construction for the nitrate loading analysis and should not be used for septic system <br /> I design purposes. Typically, use estimates for the sizing of septic systems include a peak use <br /> I factor, whereas the numbers discussed here are based on long-term aver es. <br /> F] <br /> We derstand ffice is planned to be open approximatel eight hours per day <br /> , days week: The truck ash and heavy equipment repair shop " proposed to <br /> empl ee andF1 no custome . The Site will also have spaces available for ailers t be <br /> I <br /> F1902 Industrial Way■Lodi,CA 95240■209.367.3701 ■Fax 209.369.4228 9)2007 Neil 0.Anderson&Associates,Inc <br /> r <br />