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Soil Suitability I Nitrate Loading Study 1rerracon <br /> Whitlow Property ■ Stockton, CA <br /> November 20, 2019 ■ Terracon Project No. NA197078 <br /> The nitrate concentration of rainfall is estimated to be 1 mglL-N (Hantzsche and Finnemore, <br /> 1992). <br /> 2.3.3 Current On-Site Sources of Nitrate <br /> There are current on-site sources of nitrate include natural processes. <br /> 2.3.4 Future On-Site Sources of Nitrate <br /> Future on-site sources of nitrate include the proposed septic system and natural processes. <br /> 2.3.4.1 Quantity and Quality of Wastewater from Project <br /> The following discussion is for determining the long-term wastewater flow generated from the <br /> proposed development for the nitrate loading analysis and should not be used for septic system <br /> design purposes. Typicaliy, use estimates for the sizing of septic systems Include a peak use <br /> factor, whereas the numbers discussed here are based on long-term averages. <br /> The estimated sewage flow rates for use categories are available from a number of references. <br /> The uses presented below were guided by the San Joaquin County On-Site Wastewater <br /> Treatment Standards (OWTS) dated 2017, Crites and Tchobanoglous (1998). and EPA (1980). <br /> Table 4-2 of the text from Crites and Tchobanoglous indicates that the typical residential use rate <br /> is 70-gallons per day per bedroom. The EPA Design Manual (Table 4-6) indicates the typical use <br /> rate is 45-gallons per day per resident. Based on a review of the United States Geoiogical Survey <br /> (USGS) California Water Science Center California Water Use 2010 Data, average daily domestic <br /> use per capita was estimated at fig-gallons per day. The EHD recommends a residential use rate <br /> of 70-gallons per person/day times two persons per bedroom. <br /> The following table presents the proposed septic wastewater use for the site. The fates 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 /> Responsive ■ Resourceful ■ Reliable 16 <br />