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0 F! July 11, 2007 NOA Project Number: E07094A 3.4 Future On-Site Sources of Nitrate ! ` 3.4.1 Quantity and crd Quality ofDomestic Wastewater From Proposed Project = The followingdiscussion is for determining the long-term waste water flow generated from the existing residences or existing and proposed religious usage for the nitrate loading analysis and Fshould not be used for septic system design purposes. Typically,use estimates for the sizing of septic systems include a peak use factor,whereas the numbers discussed here are based on long-term averages. Fj' Three residences, a meditation center and an assembly hall currently exist on the site. A residence for eight monks, a residence for twoo nuns and a residence for one monk exist on site. Within the next five years, a new assembly hall willre lace the existing temple_The proposed assembly hyowill serve ight monks, once per month and approximately:l�5 attendant os nce per year. F) The existing assembly hall will have a seating capacity for 499 attendants. This building will be used five days in a raw, once per year for an annual.religious_ceremon.... The temple has an existing ystem sof one, 1200 gallon grease trap, two, 1200 gallon septic tanks, three, 100 foot leach lines and FJ three 25 foot by 36 inch seepage pits. For the high use time of year of five days in a row, one time per year, the owners of the temple have brow h�g tin tempora portable bathroom units. The owners are proposing to expand the existing system to incorporate this peak flow time and no longer have E ! to bring in the portables. E ! The estimated sewage flow rates for use categories are available from a number of references. The uses presented below were guided by the San Joaquin County On-Site W lasteuvater Di.r2osal Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate 2 gallons per day per person are "ical for an airport or restaueaixt,which is similar for a temple visitor (Crites and Tchobanoglous, 1998). The text from Crites and Tchobanoglous (199 8) (Table 4-2) indicates ws,0e4,/c61�^C F! that the typical residential use rate is-77-0 gallons per dayjhe EPA (1980) Design Manual (Table 4-6) indicates the typical use rate is 45 gallons per day for a resident. The following tables presents the septic waste water uses associated with the site. The rates presented from the references provide general guidance but do not always reflect a match in usage. Careful examination,professional judgement, and experience are necessary to select a reasonable flow rate estimate. The flow rates selected for the uses associated with this project are presented next. F, 5 �t