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Soil Suitability/Nitrate Loading Study Irerracon <br /> Vacant Commercial Property■ Stockton, California <br /> December 7, 2018 ■ Terracon Project No. NA187056 <br /> 2.3.3 Current On-Site Sources of Nitrate <br /> There were no current on-site sources of nitrate. Historical site uses included former residential <br /> septic systems, a former commercial septic system, former agricultural land use, and natural <br /> processes. <br /> 2.3.4 Future On-Site Sources of Nitrate <br /> Future on-site sources of nitrate are discussed in Section 1.3.7. <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 St. Luke's Church construction (6,000 gpd). Refer to Section 1.3.7 for further <br /> discussion. The estimated sewage flow rates for use categories are available from a number of <br /> references. The uses presented below were guided by the San Joaquin County On-Site <br /> Wastewater Disposal Standards (2017), Crites and Tchobanoglous (1998), and EPA (1980). The <br /> 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. Careful <br /> examination, professional judgment, and experience are necessary to select a reasonable flow <br /> rate estimate. The flow rates selected for the uses associated with this project are presented <br /> below. These flow rates are average daily rates over the entire year and should not be used for <br /> septic system design. These average daily rates are for nitrate loading purposes. Septic system <br /> design should take into account maximum daily rates. Average daily flow was calculated for the <br /> proposed project based on the anticipated occupancy for the site. Maximum occupancies had not <br /> yet been established for the individual buildings. <br /> Table 9. <br /> Typical Quantity of Effluent. <br /> Estimated Average wastewater use per Average days <br /> Category Maximum person per day* of use per Average Daily Flow <br /> Occupancy (gallons) year <br /> St. Luke's <br /> Church (600 person x 10 gal x 365 <br /> Sanctuary 600 10 365 days)/365 days per year= <br /> Kitchen 6,000 gpd <br /> Youth Center <br /> Average Daily Flow 6,000 gallons per day <br /> Note:gpd is gallons per day.*Value cited from the San Joaquin County Onsite Wastewater Treatment Standards(2017)Table 6.6. <br /> The average total nitrogen concentration of domestic wastewater is normally considered to be 20- <br /> 85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is estimated <br /> Responsive ■ Resourceful ■ Reliable 18 <br />