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employees of the facility, as well as any volunteers or guest clinicians at events. Crites <br /> and Tchobanoglous list 5 gallons per person for an attendee at a visitor center; this <br /> value has been used for day visitors to the Site. <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 staff, volunteers, and visitors to the equestrian 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 1,583.6 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 36.4 mg/L-N at 1,583.6 <br /> gallons per day. Please see the following tables: <br /> LOGE 1943 Page 13 <br />