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n <br /> September 30, 2007 <br /> NOA Project Number: E07146A <br /> x//4.4 Future On-Site Sources of Nitrate <br /> ✓4.4.1 Quantity and Quality ofDomesdc Wastewater From Proposed Project <br /> The following discussion is for determining the long-term waste water flow generated from the <br /> proposed development for the nitrate loading analysis and should not be used for septic system <br /> design purposes. Typically,use estimates for the sizing of septic systems include a peak use factor, <br /> whereas the numbers discussed here are based on long-term averages. <br /> The wine tasting room is proposed to ha two employees per ay and will serve an a rage of ten <br /> 1 customers per day. We understand that it is p ed to be op <br /> pproximately 5 hours per e <br /> 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 Wastewater Di.Posal Standards <br /> (2003), Crites and Tcbobanoglous (1998),and EPA (1980).The references indicate that 13 gallons <br /> for each employee is typical for an office worker. (Crites and Tchobanoglous, 1998).The average <br /> waste water flow for a customer in a wine tasting room is estimated to be close or below what the <br /> �- average wastewater flow would be for a customer in a cocktail lounge,which is approximately 15 <br /> gallons per person. <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 ate necessary to select a reasonable <br /> flow rate estimate. The flow rates selected for maximum uses associated with this project are <br /> presented in the following table. <br /> Typical Quanti of Effluent <br /> L'1' Tom Average Quantity Average Daily Flow <br /> Category People per per Person Per Parcel <br /> Day / <br /> 2 13 gal/day/employee (2 employees* 13 gpd) = 26 gpd* 5/7= 18.6 gpd <br /> Commercial ---� * 1/ <br /> �- 10 15 gal/day/customer �0 customers 15 gpd)`= 150 gpd 5/7 =107.1 gpd YYY <br /> Total AverDaily Flow 126avera gallons per day <br /> Note —gpd is gallons per day;5/7 is a conversion for the 5-day work w <br /> }-! For the subject property, the total daily waste water quantity is 176 gallons per day.A five-sevenths <br /> conversion was used to account for a five day work week. Five-sevenths of 176 gallons per day is <br /> 126 gallons per day average. <br /> Fl <br />