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Sunrise Trucking—Nitrate Loading Section Page 12 of 16 <br /> Our Project Number: NA157003G <br /> October 23, 2015 <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 Lathrop, 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 7 for <br /> the data and calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Lathrop is located within evapotranspiration zone number 12. <br /> Average rainfall was obtained from the Western Regional Climate Center(Station 045303)for the <br /> Manteca area. <br /> Table 3. <br /> Estimate of Deep Percolation of Rain for the Site <br /> IF Location Deep Percolation of Rain <br /> Lathrop 2.47 inches <br /> ' Based on this method, the average deep percolation of rain for the Lathrop area is estimated to <br /> be 2.47 inches/year. The nitrate concentration of rainfall is estimated to be 1 mg/L-N (Hantzsche <br /> and Finnemore, 1992). <br /> 2.3.3 Current On-Site Sources of Nitrate <br /> The current on-site sources of nitrate include natural processes. <br /> 2.3.4 Future On-Site Sources of Nitrate <br /> Future on-site sources of nitrate are discussed in section 1.3.7. <br /> 2.3.4.1 Quantity and Quality of Wastewater from Project <br /> The following discussion is for determining the long-term wastewater flow generated from the <br /> proposed construction including a 150 square foot guard shack and restroom building (with one <br /> toilet and sink). The guard shack is estimated to have a maximum of two permanent employees <br /> per day; no visitors are anticipated at the guard shack. We understand that the guard shack will <br /> ' be open approximately twelve hours per day, five days per week. <br /> 02015 Neil O.Anderson&Associates,Inc. <br /> A Terracon Company <br />