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I <br /> rr <br /> April 9,2007 <br /> NOA Project Number: E07045A <br /> /waste water flow for both the residential and office worker categories. Therefore, 13 gpd will be <br /> / used for each employee. The average waste water flow for a customer in a wine tasting room is <br /> estimated to be close or below what the average wastewater flow would be for a customer in a <br /> cocktail lounge,which is approximately 15 gallons per person. <br /> The rates presented from the references provide general guidance but do not always reflect a match <br /> l in usage. Careful examination,professional judgement, and experience are necessary to select a <br /> ` reasonable flow rate estimate. The flow rates selected for the uses associated with this project are <br /> presented in the following table. <br /> — Table 2. <br /> Typical Quantity of Effluent from Commercial Sources. <br /> _ Category Total People Average Quantity Average Daily Flow <br /> per Day per Person Per Parcel <br /> Residents 7 70 gal/day/person 70 residents/day x 70cj/person <br /> =490 gpd <br /> Employee 5 13 gal/day/person (5 employee/day x 13 gpd/person 3/7)x 1.5/12 <br /> 8P <br /> Customer 30 15 gal/day/person (30waplagae/day x 15 gpd/person x 3/7)x 10.5/12 ly <br /> d <br /> TOTAL684 d JJ <br /> Note —gpd is gallons per day.6/7 is a conversion factor for a 6 day work week. <br /> 1 <br /> ` The daily septic waste water quantity for the existing and proposed development is estimated to be <br /> 684 gallons per day. <br /> LThe average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N (Crites and Tchobanoglous, 1998). For the purposes of the nitrate loading estimate, <br /> L the long-term average concentration for total nitrogen in residential waste water is estimated to be <br /> approximately 45 mg/L-N and the long-term average concentration for total nitrogen in employee <br /> and customer waste water is 65 mg/L-N. <br /> LThe adjusted nitrogen long term average using a weighted average is 50.67 mg/L-N. Below is the <br /> long term weighted average of nitrogen in the-proposed development waste water. <br /> C90 gpd x 45 mg/1,N=22,050 <br /> 194 d 65 m Tzw& . <br /> 34,660 / 684 gp = 50.67 mg/LN <br /> i <br /> L 5 <br /> .,44 <br /> L <br />