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Soil Suitability/ Nitrate Loading Study 1rerracon <br /> Schuler Property■ Tracy, California <br /> May 30, 2019 a Terracon Project No. NA197026 <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 F. <br /> Table 9. <br /> Summary of Nitrate Mass Balance Equation. <br /> Result Average Effluent Leachfield Deep <br /> Acres Concentration Percolation <br /> Land Use (Nc)* Daily Flow Denitrification <br /> (mg/L-N) (A) (Q) (gpd) (Nw) (d) of Rainfall <br /> (mg/L-N) (R)(in) <br /> Existing Residence 17.7 2.27 560 35 35% 1.01 <br /> Proposed Mobile 16.5 2.27 420 35 35% 1.01 <br /> Home <br /> Existing Residence 34.20 x <br /> and Proposed Mobile <br /> Home w . - <br /> *Maximum contaminant level(MCL)for nitrate in drinking water is 10 mg/L-N. <br /> Based on the nitrate loading balance calculation (Table 9), nitrate as N levels for the existing <br /> residence is anticipated at 17.7 mg/L-N, which is above the MCL of 10.0 mg/L-N. The proposed <br /> mobile home use is anticipated to add an additional 16.5 mg/L-N for a combined total of 34.20 <br /> mg/L-N also above the MCL. <br /> 2.3.6 Impact of Nitrate Loading to Nearby Water Sources <br /> Since the subject property building area is relatively flat, we do not foresee percolating effluent <br /> affecting any surface water resources. <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 (34.20 <br /> mg/L N) indicates that the development on the parcel may cause a buildup of nitrates in the aquifer <br /> above the MCL of 10 mg/L-N. <br /> 2.4.2 Methods of Mitigation <br /> Mitigation may consist of the utilization of an advanced water treatment product such as those <br /> available by Orenco, which are specifically designed to lower nitrates at point of discharge. Other <br /> Responsive ■ Resourceful ■ Reliable 16 <br />