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limited, we assume total nitrogen is similar to higher residential values; therefore, 85 <br /> mg/L-N is selected for visiting guests and volunteers of the religious facility. <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 incorporate peak and surge flow factors. The estimates used <br /> in the On-Site Wastewater Treatment Systems Standards may be greater than those <br /> discussed here. <br /> The maximum average daily flow for the Site was estimated to be 958 gallons per day <br /> (gpd). Through the use of a weighted average, the average concentration of all the <br /> different effluent flows and concentrations was determined to be 41.2 mg/L-N at 958 <br /> gallons per day. Please see the following tables: <br /> Table 3. Average Daily Flow Calculation <br /> Use Units Rate Subtotal Adjustment Average Daily <br /> Flow <br /> Volunteers 2 13 gal/person/day 26 gpd None 26 gpd <br /> (daily) <br /> Residence 3 BR 140 gal/BR/day 420 gpd None 420 gpd <br /> Congregants, <br /> weekdays 10 5 gal/person 50 gpd 300/365 29.4 gpd <br /> (no kitchen use) 300 <br /> Congregants, 2/7 <br /> weekends 40 5 gal/person 200 gpd 300/365 47.0 gpd <br /> (no kitchen use) <br /> Congregants, <br /> events 200 7 gal/person 1,400 gpd 4/365 15.3 gpd <br /> (4 per year, some <br /> kitchen use) <br /> Retreat guests 2,350 <br /> (overnight 47 50 gal/person gpd 65/365 418.5 gpd <br /> on-site) <br /> Retreat day visitors 2 5 gal/person 10 gpd 65/365 1.8 gpd <br /> Total 958 gpd <br /> Adjustment factors convert calculated flow into average daily flow over a year. This needs to be taken into account <br /> since attendance varies by day of the week, and retreats take place only part of the year. The factors 2/7 and 5/7 <br /> refer to days per week. The factors 65/365 and 300/365 refer to days per year. No adjustment factor is used for a <br /> residence since it is continuously occupied. <br /> LOGE 1938 Page 13 <br />