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1 <br /> May 17, 2007 <br /> NOA Project Number: E07064A <br /> peak use factor,whereas the numbers discussed here are based on long-term averages. <br /> The proposed storage facility will have a maximum of six employees. We understand that the <br /> business will entail storage,with approximately 150 self storage units with an aversf five to to <br /> customers per day. We understand that the store is planned to be open approximately`1�2-tours-per <br /> day, seven days per week. <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). No specific category is indicated for <br /> customers to a self-storage facility. Therefore,we estimate that 2.0 gallons per day for each <br /> customer. The references indicate that 14 gallons for each employee is typical for an office worker. <br /> (Crites and Tchobanoglous, 1998). <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 /> next. <br /> Table 1. <br /> Typical Quantity of Effluent <br /> Category Total People per Average Quantity per Average Daily Flow <br /> Day Person Per Parcel <br /> Commercial 16 2.0 gal/day/customer (10 customers*2.0 gpd) + <br /> 14 gal/day/employee G employees* 14 d = 12±Spj <br /> Note —gpd is gallons per day. <br /> For the subject property, the total daily waste water quantity is 104 gallons per day. <br /> The average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is <br /> estimated that commercial use will have higher concentrations of total nitrogen when compared to <br /> residential use. It is estimated that the average concentration for total nitrogen in waste water for <br /> the project is approximately 85 mg/L-N over the long term. <br /> ri <br /> 5 <br />