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Soil Suitability Nitrate Loading Study l�erracon <br /> Recreation Vehicle Service Facility ■ Lockeford, CA <br /> April 12, 2017 is Tenacon Project No. NA177006 <br /> Note:gpd is gallons per day."Value cited from the San Joaquin County On-Site Wastewater Disposal Standards(2003)6.1.15. <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 /> that commercial use will have higher concentrations of total nitrogen since the effluent will come <br /> primarily from toilets when compared to residential use. It is estimated that the average <br /> concentration for total nitrogen in wastewater for the project is approximat 85 mg/L- verthe <br /> long term. <br /> 2.3.4.2 Denitrification Estimate <br /> Denitrification is an important process which occurs within the leach field whereby certain bacteria <br /> utilize the oxygen in the nitrate (NO3) and release nitrogen gas (N2) to the atmosphere. <br /> Denitrification is expressed as a percentage, and the normally accepted range is 10 percent to 35 <br /> percent. Soils with higher clay content, moist soil conditions, high pH, and organic material <br /> denitrify by about 35 percent, and soils with high sand content and fast percolation rates are <br /> estimated to denitrify at a lower rate,about 10 percent to 15 percent. As near surface-pads-consist <br /> of silty clay with known clay and hardpan strata below, a denitrification factor f 20 percen as <br /> selected for the site. <br /> 2.3.5 Nitrate Loading Scenario <br /> A nitrate loading scenario was performed to determine the impact from the proposed project. The <br /> scenario utilizes the variables discussed previously which represent the estimated conditions and <br /> uses associated with this project. The following table presents a summary of the nitrate loading, <br /> calculation for the site. A copy of the nitrate loading calculation is included in Appendix E. <br /> Table 8. <br /> Summary of Nitrate Mass Balance Equation. <br /> Result Average Effluent Leachfield Deep <br /> Parcel (Nc)* Acres(A) Daily Flow Concentration Denitrification Percolation <br /> (Nw) of Rainfall <br /> (m9/L-N) (Q) (gPd) (mg/L-N) Id) (R) (in) l4 i <br /> 1 2.6 2.32 25 85 20% 5.76 <br /> "Maximum c ntamina leve CL)for nitrate in drinking water is 10 mg/L-N. <br /> 2.3.6 Impact of Nitrate Loading to Nearby Water Sources <br /> Since the site is relatively flat, we do not foresee percolating effluent affecting any surface water /3 .0 <br /> resources. l <br /> Responsive■ Resourceful ■ Reliable 15 <br />