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Table 3. Rainwater Nitrate Concentration <br />Date Nitrate (mg/L-N) <br />5/17/2019 0.4 <br />5/19/2019 0.2 <br />3/16/20 0.2 <br />5/18/20 0.4 <br />1/27/21, 10:00 0 (Non-detect) <br />1/27/21, 19:30 0 (Non-detect) <br />1/29/21 0.2 <br />2/11/21 0 (Non-detect) <br />2/12/21 0.1 <br />Average 0.17 <br />Live Oak then averaged the concentrations of the nine samples, for a value of 0.17 <br />mg/L-N to represent the nitrate concentration of rain. <br />Because the San Joaquin County Environmental Health Department has requested that <br />local and recent data be utilized wherever possible, the concentration of the Lodi <br />rainwater been selected for use in the nitrate loading calculation. <br />Quantity and Quality of Domestic Wastewater <br />According to Mr. Asghar, a new restroom will be constructed to serve five workers. <br />They will work standard hours, Monday through Saturday. <br />The estimated sewage flow rates for various uses are available from a number of <br />references. The uses presented below were guided by the San Joaquin County On-Site <br />Wastewater Treatment Systems Standards (2017), Crites and Tchobanoglous (1998), <br />and US EPA (1980). Crites and Tchobanoglous indicate that 13 gallons per day for <br />each employee is typical for an office or industrial worker; this rate was selected for the <br />facility's employees. <br />The estimated flow values discussed here should not be used for the design and sizing <br />of the septic system. The design and sizing of the septic system should utilize the San <br />Joaquin County Environmental Health Department On-Site Wastewater Treatment <br />Systems Standards, which incorporates peak and surge flow factors. The estimates <br />LOGE 2130 Page 10