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August 31, 2006 -- NOA Project Number: E06091A �I 3.4 Future On-Site Sources of Nitrate 3.4.1 Quantity and Quality ofDomestic Wastewater From Proposed Project The following discussion is for determining the long-term waste water flow generated from the proposed residences or commercial usage for the nitrate loading analysis and should 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. A residence exists on the property which will be inhabited regularly by five to seven Buddhist ` monks. A total of seven people will be used to calculate the residential septic tank usage for the site. i The average daily temple attendance will be approximately 10 to 25 people per day,however, the -� maximum expected usage in the future will be up to a maximum of 80 attendants per day; the number that will be used to calculate temple septic tank usage for the site. The estimated sewage flow rates for use categories are available from a number of references. The v uses presented below were guided by the San Joaquin County On-Site Wastewater Dispo al Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate 3 gallons per E. day per person are typical for an airport or restaurant,which is similar for a temple visitor (Crites i w and Tchobanoglous, 1998). The text from Crites and Tchobanoglous (1998) {Table 4-2) indicates that the typical residential use rate is 70 gallons per day. The 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 j{ flow rate estimate. The flow rates selected for the uses associated with this project are presented f next. Table 1. C- Typical Quantity of Effluent Category Total People per Average Quantity per Average Daily Flow {� Day Person Per Parcel 1�. Residential 7 70 gal/day/resident 7 residents*70 gpd=490 gpd 3 -40 ' J Religious 80 3.0 gal/day/member 80 members*3.0&Ed = 240 gpd 1 Note —gpd is gallons per day. For the subject property, the.total daily waste water quantity is 730 gallons per day. The average total nitrogen concentration of domestic waste water is normally considered to be 20-85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is estimated that religious facility use will be approximately 80 mg/L-N. A weighted average is therefore used to calculate the total mg/L-N over the long term in the flow for the site since this project will include both religious and r 5 F