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Soil Suitability/Nitrate Loading Study 1rerracon Proposed Global Carrier Inc. ■ Manteca, California August 8, 2018■ Terracon Project No. NA187034 Table 6. Estimate of Deep Percolation of Rain for the Site Location Deep Percolation of Rain Manteca 2.86 inches per year Based on this method, the average deep percolation of rain for the Lodi area is estimated to be 2.86 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 a residence, agricultural land use (ie: almond orchard), and 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 facility. The office and tire and brake shop will be open 8 hours per day five days per week. One restroom in the tire and brake shop will remain open 24 hours per day seven days per week year round. The office restroom will consist of one sink and one low-flow toilet. The tire and brake shop restrooms will consist of 2 sinks and 2 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 30 gallons per day is typical for each office employee, 15 gallons per shop employee, and 5 gallons per day for visitors, when utilizing a low-flow flush system. The following table presents the proposed septic wastewater use for the site. The rates presented from the references provide general guidance but do not always reflect a match in usage. Careful examination, professional judgment, and experience are necessary to select a reasonable flow rate estimate. The flow rates selected for the uses associated with this project are presented below. These flow rates are average daily rates over the entire year and should not be used for septic system design. These average daily rates are for nitrate loading purposes. Septic system design should take into account maximum daily rates during the season. Responsive■ Resourceful ■ Reliable 15