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1 <br /> Soil Suitability/ Nitrate Loading Study Irerracon <br /> Jeremy Winery i.,.- Lodi, CA <br /> May 7, 2019 e, Terracon Project No. NA197008 <br /> The OWTS manual sugggests that 15 gallons per person is typical for industrial building <br /> employees which is similar to the proposed winery development and recommends 20 gallons per <br /> person per day for a customer in a bar/cocktail lounge which is similar to a customer in a wine <br /> tasting room. <br /> The following table presents the proposed septic wastewater use for the site. The rates presented <br /> from the references provide general guidance but do not always reflect a match in usage. Should <br /> any of the above information provided to our office change or is inconsistent with what is stated, our <br /> office shall be contacted to make any necessary modifications to our calculations. Examination and <br /> professional judgement, and experience shall be used when selecting a reasonable flowrate. <br /> Table 10. <br /> Typical Quantity of Effluent from Commercial Sources. <br /> Average <br /> Total Effluent <br /> Category People Quantity per Average days Max Daily Flow Average Daily Flow <br /> of use per year (gpd*) (gpd*) <br /> per day Person <br /> (gpd*) <br /> (5 employees x 15 gal. <br /> Employee 5 15 365 5 employees x 15 gal. per day x 365 days per <br /> per day= 75 year)/365 days per year <br /> = 75 <br /> (15 customers x 20 gal. <br /> Customers 15 20 365 <br /> 20 customers x 15 per day x 365 days per <br /> gal. per day= 300 year)/365 days per year <br /> = 300 <br /> Special (150 customers x 20 gal. <br /> Event 150 20 5 150 customers x 20 per day x 5 days per <br /> Customers gal. per day= 3,000 year)/365 days per year <br /> =41.1 <br /> Total 3,375 gpd 416.10 gpd <br /> *gpd -gallons per day <br /> Based on a review of Table 10, the total maximum daily wastewater quantity is approximately <br /> 3,375 gallons per day. As the special events will be held five days per year, a 5/365 conversion <br /> factor was used to calculate the average daily flow for the special events. The total average daily <br /> flow for the project is approximately 416.10 gallons per day. <br /> The average total nitrogen concentration of domestic wastewater is normally considered to be 20 <br /> to 85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is estimated <br /> that commercial use will have higher concentrations of total nitrogen when compared to residential <br /> use. For the purposes of the nitrate loading estimate, it is estimated that the average <br /> concentration for total nitrogen in wastewater for the project is approximately 85 mg/L-N over the <br /> long term. <br /> Responsive ■ Resourceful ■ Reliable 16 <br />