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a restaurant, and 7 gallons per meal is the typical use for a dining hall. For the purpose <br /> of this study, 7 gallons per person has been selected to represent the congregants at <br /> the California Islamic Center. Selection of this value is highly conservative; Mr. Khan <br /> has indicated that the Center's small kitchen is only used occasionally at weddings or <br /> other ceremonies, and is not used during daily services. <br /> Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person <br /> per day for an individual residence. The San Joaquin County Environmental Health <br /> Department has indicated that maximum flow and double occupancy within each <br /> bedroom should be considered for the nitrate loading assessment; as a result, a value <br /> of 140 gallons per bedroom per day has been selected (personal communication, <br /> January 6, 2017). <br /> A typical residential concentration of 35 mg/L of nitrate as N was selected for the <br /> existing residence (Crites and Tchobanoglous, 1998). Total nitrogen levels from <br /> commercial wastewater uses are known to be higher in concentration compared to <br /> residential levels, which include significant dilution from washing water. The typical <br /> residential wastewater range is reported to be 20 to 85 mg/L-N (Crites and <br /> Tchobanoglous, 1998). Since reference material for commercial restroom uses is <br /> limited, we assume total nitrogen is similar to higher residential values; therefore, 85 <br /> mg/L-N is selected for congregants 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 1,219.5 gallons per <br /> day (gpd). Through the use of a weighted average, the average concentration of all the <br /> different effluent flows and concentrations was determined to be 62.0 mg/L-N at 1,219.5 <br /> gallons per day. Please see the following tables: <br /> LOGE 1939 Page 12 <br />