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• Soil Suitability/ Nitrate Loading Study 1 f�rracon <br /> Sun Valley Express Truck Center ■ Acampo, California <br /> August 14, 2017 ■ Terracon Project No. NA177026 <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 B. <br /> Table 8. <br /> Summary of Nitrate Mass Balance Equation. <br /> Result Average Effluent Leach Field Deep <br /> Parcel (Nc)" Acres (A) Daily Concentration Denitrification Percolation <br /> Effluent (Nw) of Rainfall <br /> • (mg/L-N) (Q)(gpd) (mg/L-N) 1d1 (R) (in) <br /> 1 8.7 3.59 214 85 25 5.76 <br /> Maximum contaminant level(MCL)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 subject property is relatively flat, we do not foresee percolating effluent affecting any <br /> surface water sources. <br /> 2.4 Discussion of Nitrate Loading Results <br /> 2.4.1 Total Nitrate Impact <br /> Based on the method and assumptions described, the result of the nitrate loading balance <br /> indicates that the development on the parcel should not cause a buildup of nitrates in the aquifer <br /> above 10 mg/L-N. <br /> 2.4.2 Methods of Mitigation <br /> • <br /> Because of the favorable result of the nitrate loading calculation, no mitigation measures are <br /> warranted. <br /> 3.0 CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions at the site consist of low permeable sandy silt near the surface <br /> which was underlain by low permeable cemented silty sand "hardpan". The hardpan was <br /> underlain by a clayey sandy silt at 20 feet bgs extending to the maximum depth explored of 25 <br /> feet bgs. Given the low permeable soil conditions near the surface, our shallow percolation test <br /> failed to meet standard minimum 60 minutes per inch by EHD for the sole use of leach lines, <br /> • <br /> Responsive n Resourceful Reliable 15 <br />