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recharge from percolating waters for the Manteca station is determined to be 3.64 inches (Plate 14). A statistical error of 48% is associated with this value. The average recharge rates from the above two stations were then averaged, for a regional recharge rate of 3.38 in. The nitrate concentration of the recharge waters was estimated to be 1 mg/L-N (Hantzsche and Finnemore). Quantity and Quality of Domestic Wastewater According to Jasdeep Singh and Hardeep Singh, the proposed trucking facility will employ two mechanics and two security guards 24 hours per day; the employees will work seven days per week. In addition, 25 to 30 trucks will depart the facility daily; because the trucks are hauling cargo cross-country, no truck is anticipated to visit the Site more than once per day. A three-bedroom house is also located on the Site. The estimated sewage flow rates for various uses are available from a number of references. The uses presented below were guided by the On-Site Wastewater Treatment Systems Standards (2017), Crites and Tchobanoglous (1998), and US EPA (1980). The references indicate that 13 gallons for each employee is typical for an office or industrial worker and 5 gallons is typical for a public restroom user; these rates were used for the employees of the facility and the 30 daily departing truckers (Crites and Tchobanoglous, 1998). Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person per day for an individual residence. The San Joaquin County Environmental Health Department has indicated that maximum flow and double occupancy within each bedroom should be considered for the nitrate loading assessment; as a result, a value of 140 gallons per bedroom per day has been selected (personal communication, January 6, 2017). The estimated flow values discussed here should not be used for the design and sizing of the septic system. The design and sizing of the septic system should utilize the San Joaquin County Environmental Health Department On-Site Wastewater Treatment Systems Standards which incorporate peak and surge flow factors. The estimates used in the On-Site Wastewater Treatment Systems Standards may be greater than those discussed here. The nitrate as nitrogen (N) concentration of the employee and trucker use is estimated to be 85 mg/L (US EPA, 1980). A typical residential concentration of 35 mg/L of nitrate as N was selected for the residence (Crites and Tchobanoglous, 1998). LOGE 1843 Page 10