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f <br /> Ff July 6, 2007 <br /> NOA Project Number: E07096A <br /> posed olive mill will have a maximum of e <br /> Thfour employees.We understand that the business <br /> proposed <br /> p <br /> will maintain normal business hours, five days per week. The property also has a two bedroom <br /> residence. <br /> PThe 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 Wliastewater Disposal Standards <br /> F1 (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate that 14 gallons <br /> for each employee is typical for an office worker and that the typical residential use rate is 70 gallons <br /> per day (Crites and Tchobanoglous, 1998). The EPA (19 80) Design Manual (Table 4-6) indicates <br /> 0 the typical use rate is 45 gallons per day for a resident. <br /> j The following tables presents the septic waste water uses associated with the site. The rates <br /> F F1presented 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 /> r next. <br /> Table 1. <br /> Typical Quantity of Effluent <br /> Total People per Average Quantity per Average Daily Flow <br /> 1 Category Day Person Per Parcel <br /> Residential 3 70ga1/day/person 3 residents x 70 gpd =210 gpd <br /> Commercial 4 14 gal/day/employee 4 employees x 14 gpd= 56 <br /> TOTAL 266 gpd <br /> Note _gpd is gallons per day. <br /> For the subject property, the total waste water flow rate is 266 gallons per day.The average total <br /> nitrogen concentration of domestic waste water is normally considered to be 20-85 mg/L-N with 35 <br /> to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is estimated that commercial use <br /> will have higher concentrations of total nitrogen when compared to residential use. It is estimated <br /> 1 that the average concentration for total nitrogen in waste water for the project is approximately <br /> 53.42 mg/L-N over the long term. Please see the following table for the weighted average 6-21calculation of total nitrogen concentration.. <br /> Table 2. <br /> Weighted Average of Residential / Commerical <br /> Total Nitrogen Concentration <br /> 45 mg/L,N x 210 gpd= 9,450 mg/L-gal <br /> 85 mg/L-N x 56 gpd =4,760 mg/L-gal <br /> 266 gpd 14,210 mg/L-gal <br /> F14,210 m /L- l/ 266 gpd=53.42 m /L-N <br /> ! 1 5 <br />