SR0081180 SSNL - Laserfiche WebLink

Home Browse Search

attendees per day." Mr. McNamara indicated that 10 or less congregants per day are anticipated on weekdays. The estimated sewage flow rates for various uses are available from a number of references. The uses presented below were guided by the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017), Crites and Tchobanoglous (1998), and US EPA (1980). 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 (personal communication, January 6, 2017); as a result, a value of 140 gallons per bedroom per day has been selected for the three-bedroom residence on the Site. Crites and Tchobanoglous list a value of 50 gallons per day for a guest at a hotel. Because the guests at the retreat on the Site will be staying for a maximum of 10 days, during which time they will not wash laundry or do other water-intensive activities, the hotel use value is appropriate and is selected for the guests. Crites and Tchobanoglous indicate that 13 gallons per day for each employee is typical for an office worker; this rate was used for the volunteers of the religious facility. The On-Site Wastewater Treatment Systems Standards indicate 10 gallons per seat is the typical flow for a church with a kitchen; however, this value is intended for use in sizing septic systems and may overestimate use. Crites and Tchobanoglous indicate 3 gallons per seat is the typical use for an assembly hall, 9 gallons per customer is the typical use for a restaurant, and 7 gallons per meal is the typical use for a dining hall. For the purpose of this study, 7 gallons per person has been selected to represent the guests at an event, during which time a meal may be served. A value of 5 gallons per person is typically assigned to attendees at a religious facility without a kitchen; this value has been selected to represent daily (non-retreat, non- event) congregants because the kitchen will not be used on a daily basis. Crites and Tchobanoglous list 5 gallons per person for an attendee at a visitor center; this value has been used for day visitors to the Site. A typical residential concentration of 35 mg/L of nitrate as N was selected for the existing residence and proposed retreat housing (Crites and Tchobanoglous, 1998). Total nitrogen levels from commercial wastewater uses are known to be higher in concentration compared to residential levels due to less dilution from non-toilet sources. The typical residential wastewater range is reported to be 20 to 85 mg/L-N (Crites and Tchobanoglous, 1998). Since reference material for commercial restroom uses is LOGE 1938 Page 12