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Soil Suitability / Nitrate Loading Study <br />Morada Produce — Ag Processing Building Stockton, California <br />May 14, 2021 Terracon Project No. NA217014 <br />lierracon <br />2.3.3 Current On-Site Sources of Nitrate <br />The current on-site sources of nitrate include the orchard applications, natural processes and the <br />existing septic systems. <br />2.3.4 Future On-Site Sources of Nitrate <br />Future on-site sources of nitrate include the existing septic systems, proposed septic system, <br />and natural processes. <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 development for the nitrate loading analysis and should not be used for septic system <br />design purposes. Typically, use estimates for the sizing of septic systems include a peak use <br />factor, whereas the numbers discussed here are based on long-term averages. <br />Small and Decentralized Wastewater Management Systems Tables 4-2 and 4-3 (Crites and <br />Tchobanoglous, 1998) recommends the following typical commercial wastewater use rates: <br />13 gallons/person for offices and 3 gallons/customer or visitor <br />The rates presented from the references provide general guidance but do not always reflect a <br />match in usage. Should any of the above information provided to our office change or is inconsistent <br />with what is stated, our office shall be contacted to make any necessary modifications to our <br />calculations. <br />The following table is an estimate of the facility's average daily flow (ADF) rate for the existing and <br />proposed septic system usage. <br />Table 10. <br />Long Term Average Daily Flow Rates <br />Septic <br />System <br />No. <br />Building <br />ID <br />Number <br />Hours of <br />per day <br />Operation Effluent Employees <br />per day <br />Employee Numbero f Number <br />Visitors / <br />Truckers <br />per day <br />Visitor <br />Effluent <br />Maximum <br />Septic Tank <br />Usage <br />Employee <br />GPD + <br />Visitor GPD <br />AverageLong Number <br />of Days <br />per <br />Year <br />Term <br />ADF <br />(GPD) <br />1 Northwest <br />Restroom <br />9 <br />(Standard) 10 146.25 2 6 152.25 365 152 <br />2 South <br />Restrooms <br />9 <br />(Standard) 60 877.50 10 30 897.50 215 528 <br />9 <br />(Apr-Jun, <br />Aug-Sep) <br />1,800 26,325 25 75 26,400 150 10,849 <br />3 Northeast <br />Restrooms <br />9 <br />(Standard <br />Mar-Sep) <br />50 731.25 3 9 740.25 210 426 <br />9 80 1,170 2 6 1,176 60 193 <br />Res Resourceful 16