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L 1 <br /> September 30, 2007 <br /> NOA Project Number: E07146A <br /> J4.4 Future On-Site Sources of Nitrate <br /> )4.4.1 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 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 <br /> of ie) <br /> customers per day. We understand that it is p ed to be ope pproximately 5 hours , <br /> days per week. <br /> The estimated sewage flow rates for use categories are available from a number of references. The <br /> V uses presented below were guided by the San Joaquin County On-Site Wastewater Diiposal 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. (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 are 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 Quantityof Effluent <br /> Total 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 / <br /> 10 15 gal/day/customer (10 customers * 15 gpd)—__150 gpd* 5/7 = 107.1 gpd VVV <br /> F) <br /> Total Average Daily Flow 126 averse gallons per da <br /> Note –gpd is gallons per day;5/7 is a conversion-for the 5-day work we <br /> FIFor 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 dam <br /> 126 gallons per day average_ <br /> <_-7— <br /> Fl . <br /> 4 <br /> I a5 �o <br />