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The nitrate concentration of rainfall was estimated to be 1 mg/L-N (Hantzsche and Z) <br /> Finnemore, 1992). <br /> Quantity and Quality of Domestic Wastewater <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 4n-Site <br /> Wastewater Disposal Standards (Sewage Standards; 2003), Crites and Tchobanoglous <br /> (1998), and EPA (1980). The references indicate that 13 gallons per employee is typical <br /> for an office worker (Crites and Tchobanoglous, 1998) and 15 gallons per employee is <br /> typical for a worker in an industrial building (SJC, 2003); these rates were used for the <br /> employees of the trucking facility. San Joaquin County indicates that 10 gallons per <br /> vehicle is typical for a service station; that rate was used for the trucks entering the Site. <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 Sewage Standards which incorporate peak and <br /> surge flow factors. The estimates used in the Sewage Standards may be greater than <br /> those discussed here. <br /> According to information provided in the Site Approval application, the proposed <br /> trucking facility will be open seven <br /> days per week year round. Five office employees <br /> ees <br /> and three <br /> maintenance shop employees will be present Monday through Friday from 6,10 <br /> 7.00 a.m. to 5:00 p.m. It is anticipated that 10 to 15 trucks could enter and exit the Site <br /> daily Sunday through Friday; up to 25 trucks are anticipated on Saturdays. The <br /> following table describes the maximum expected uses of the facility. <br /> Table 4. Use Levels <br /> Staff Position Occupancy Level Days per week Hours <br /> Office Staff 5 staff 5 days per week 7:00— 5:00 <br /> Shop Staff 3 staff 5 days per week 7:00— 5:00 <br /> TrailerlTruck Drivers 10-15 trucks 6 days per week NIA <br /> (Sunday — Friday) <br /> Truck Drivers 25 trucks 1 day per week , NIA <br /> (Saturday) <br /> A concentration of 85 mg/L of nitrate as N is selected for staff workers and truck drivers <br /> (Crites and Tchobanoglous, 1998). <br /> LOGE1025 Page 9 <br />