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August 8, 2006 <br /> NOA Project Number: E06087A <br /> 3.4 Future On-Site Sources of Nitrate <br /> F� 3.4.1 Quantity and Quality of Domestic Wastewater From Proposed Project <br /> The following discussion is for determining the long-term waste water flow generated from the <br /> proposed residences or commercial usage for the nitrate loading analysis and should not be used for <br /> septic system design purposes. Typically, use estimates for the siz!ng f septic_sys ems include a <br /> k peak use fact ,whereas the numbers discussed here are based on long-term average <br /> 1 duee bedroom residence and a two bedroom mobile home are present on the subject property.A <br /> three bedroom home is presumed to be occupied by up to four people over the long term, and a <br /> mobile home with two bedrooms is presumed to be occupied by up to three people. Therefore, a <br /> F.' total of seven people will be used to calculate the residential septic tank usage for the site. <br /> The church is proposed to have 15 employees per day during four days of the week, and serve up to <br /> t 1,000 members on Sundays. T� <br /> ►^ The estimated sewage flow rates for use categories are available from a number of references. The <br /> uses presented below were guided by the San Joaquin County On-Site Wastewater Dispo al Standards <br /> (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate that 14 gallons <br /> t~� for each employee is typical for an office worker,which is suitable for a church office employee, and <br /> 3 gallons is typical for an airport or restaurant (Crites and Tchobanoglous, 1998). The text from <br /> Crites and Tchobanoglous (1998) (Table 4-2) indicates that the typical residential use rate is 70 <br /> gallons per day. The EPA (1980) Design Manual (Table 4-6) indicates the typical use rate is 45 <br /> G gallons per day for a resident. <br /> F, <br /> The following tables presents the septic waste water uses associated with the Site. The rates <br /> presented from the references provide general guidance but do not always reflect a match in usage. <br /> Careful examination,professional judgement, and experience are necessary to select a reasonable <br /> flow rate estimate. The flow rates selected for the uses associated with this project are presented <br /> G st next. <br /> I <br /> pF <br /> i F <br /> L � <br />