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• dish washing, its nitrate as N concentration is estimated to'be 35, t e typical <br /> concentration of mixed-source, untreated domestic wastewater rites and <br /> Tchobanoglous). <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's On-Site Wastewater Disposal <br /> Standards which incorporate peak and surge flow factors. The estimates used in the <br /> On-Site Wastewater Disposal Standards may be greater than those discussed here. <br /> The maximum average daily flow for the Site was estimated to be 1,564.5 gallons per <br /> day (gpd). Please see the following table: <br /> Table 4. Average Daily Flow Calculation (Including Metering of Existing Facilities) <br /> Use Units Rate Subtotal Reduction* Average Daily <br /> Flow <br /> Employees <br /> (Proposed 4 13 gal/employee 52 gpd 5/7 37.1 gpd <br /> Truck Lube) <br /> Customers <br /> (Proposed 10 5 gal/customer 50 gpd 5/7 35.7 gpd <br /> Truck Lube) <br /> • Existing <br /> Facilities N/A 1,491.7 gal/day 1,491.7 gpd N/A 1,491.7 gpd 1 3� <br /> (metered) <br /> Total 1,564.5 gpd <br /> *Reduction factors convert calculated flow into average daily flow over a year: 5/7 and 6/7 convert for days of <br /> operation per week. <br /> Although the metered flow values will be used for the existing facilities, no breakdown of <br /> the water sources is available. Therefore, Mr. Singh's estimation of customers at the <br /> facilities will be used for to establish the nitrate concentration of the waste water. Based <br /> on the information provided by Mr. Singh, the following estimate of average daily flow is <br /> derived: <br /> • LOGE 1711 Page 12 <br />