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LOGE 20-03: Contreras SSNLS Addendum Page 2 <br /> March 25, 2020 <br /> Table 1. Inputs and Results for Nitrate Loading Calculation, <br /> Wastewater Flow Calculated by March 2020 Method <br /> Variable Value Units Description <br /> Q 350 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 1.30 acres Site area <br /> Nb 0.3 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 7.91 inches per year Recharge rate of rainfall <br /> W 3.6 inches per year Uniform waste water loading (calculated) <br /> Nc 7.3 mg/L-N Long-term average concentration of percolating effluent <br /> For this Site, the long-term average concentration of percolating effluent is found to be <br /> 7.3 mg/L-N when calculated as shown. This value is below the US EPA recommended <br /> MCL for nitrate in drinking water of 10 mg/L-N. The nitrate loading calculation is <br /> attached. <br /> Please feel free to contact us with any questions about this project. <br /> Sincerely, <br /> Live Oak GeoEnvironmental, Inc. <br /> ANAL <br /> Abigail Racco, Project Manager Q DA1/I1)J.INFLCH <br /> NO.215t <br /> CERTIFIEO <br /> �= GEOl00l5i <br /> David J. Welch, CEG, CHG, PGP FOFCA1.t�y <br /> CC: Roque Contreras <br /> 10250 N. Childress Rd. <br /> Stockton, CA 95212 <br /> Attached: Nitrate Loading Calculation <br />