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• Soil Suitability/ Nitrate Loading Study 1�erracon Sun Valley Express Truck Center ■ Acampo, California August 14, 2017 ■ Terracon Project No. NA177026 2.3.2 Contribution of Rainfall An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. The estimate of deep percolation of rain is based on the average monthly precipitation of rain fall and evapotranspiration for Lodi, California. The estimate first determines whether the average monthly precipitation exceeds average monthly potential evapotranspiration. If so, then the difference is potential deep percolation. This method does not consider runoff, although due relatively flat nature of the site runoff should be minimal. Average potential evapotranspiration was obtained from the California Irrigation Management Information System (CIMIS). Refer to Appendix B for the data and calculation. Table 6. Estimate of Deep Percolation of Rain for the Site Location Deep Percolation of Rain Lodi 5.76 inches per year Based on this method, the average deep percolation of rain for the Lodi area is estimated to be 5.76 inches/year. The nitrate concentration of rainfall is estimated to be 1 mg/L-N (Hantzsche and Finnemore, 1992). 2.3.3 Current On-Site Sources of Nitrate The current on-site sources of nitrate include natural processes. 2.3.4 Future On-Site Sources of Nitrate Future on-site sources of nitrate are discussed in section 1.3.7. 2.3.4.1 Quantity and Quality of Wastewater from Project The following discussion is for determining the long-term wastewater flow generated from the proposed construction.We understand that the project will consist of a new trucking business and will be open 24 hours per day seven days per week from August to December each year. The facility will be closed from January through July. There will be up to 12 permanent employees working three eight hour shifts per day (4 employees per shit)and up to 4 visitors and 63 truckers anticipated daily. The restrooms will consist of 4 sinks and 4 low-flow toilets. The estimated sewage flow rates for use categories are available from a number of references. The uses presented below were guided by the San Joaquin County On-Site Wastewater Disposal Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate that 15 gallons per day is typical for each employee and 5 gallons per day for visitors, when utilizing a low-flow flush system. • Responsive■ Resourceful ■ Reliable 13