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November 30, 2007 <br /> NOA Project Number: E07192A <br /> 3.4 Future On-Site Sources of Nitrate <br /> 3.4.1 Quantity and Quality ofDomestic Wastewater From Proposed Project <br /> The following discussion is for determining the long-term waste water flow generated from the <br /> proposed project.The nitrate loading analysis and wastewater estimate should not be used for septic <br /> system design purposes. Typically,use estimates for the sizing of septic systems include a peak use <br /> factor,whereas the numbers discussed here are based on long-term averages. <br /> The maximum ex Fes <br /> eptic tank usage for the site will be from various buildings. The facility will <br /> have app ' ate 1mployees workin normal b ess hours Monday through Friday and <br /> have eigh (8) mp working from 3:00�m to :00 dnight.An average of approximat �80 <br /> customers a xpected during each day. The facility be have 12 a ployees and an average o <br /> customers on Saturday from 8:00 am to 12:00 noon.The facility ' also employ 65 field employees <br /> who will only come into the facility occasionally. <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 Wlastewater Disposal Standards <br /> (2003),Crites and Tchobanoglous (1998), and EPA (1980).The references indicate that 13 gallons <br /> for each employee is typical for an office worker and 5 gallons for each field worker.The references <br /> also indicated that the 3 gallons per day is typical for a store customer (Crites and Tchobanoglous, <br /> 1998). <br /> The following table 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 /> next. <br /> Table 1. <br /> Typical Quantity of Effluent <br /> Total aiv� <br /> Category People Average Quantity Average Daily Flow <br /> per per Person Per Parcel <br /> Day <br /> Employee �4gpd <br /> M-F 1st Shif135 13 al/da /em to ee ((135 em to ees*13 gPd) 1755 gpd*5/7) <br /> Employee 8 al/da 13 t 8 employees*13 )d 104 d*5/ �7gp <br /> M-F 2nd Shift g y/em po yee (( Pto y ' <br /> Field <br /> Employee 65 5 gal/day/employee (65 employees*5 gpd) =325 gpd*5/7)C-232 gp <br /> M-F <br /> Saturday Employee day 12 13gal/day/employee ((12 employees*13 gpd) = 156 gpd* 1/7 *1/2) 11 gpd <br /> 6 <br />