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Soil Suitability / Nitrate Loading Study r ierracon <br /> FLAG CITY TRUCK AND EQUIPMENT PARKING FACILITY I Lodi, California <br /> October 6, 2023 1 Terracon Project No. NA237081 <br /> Table 10. <br /> Summary of Nitrate Mass Balance Equation <br /> Effluent <br /> Net Rainfall <br /> Result (Nc) Average Concentration Leachfield <br /> Proposed Acres Recharge <br /> Development (A) Daily Flow (Nw) Denitrification (in/year) <br /> (mg/L-N) (Q) (gpd) (d) (R) <br /> Truck Parking 3.1 13.35 375 85 15% 12.47 <br /> Facility <br /> Note: Maximum contaminant level (MCL) for nitrate in drinking water is 10 mg/L-N <br /> Based on the nitrate loading balance, nitrate levels for the proposed truck parking <br /> facility development is anticipated to increase nitrate levels to 3.1 mg/L-N for the <br /> project area which is below the MCL of 10 mg/L-N. <br /> 2.3.6. Impact of Nitrate Loading to Nearby Water Sources <br /> The nearest surface water source is an irrigation canal which is located to the adjoining <br /> south of the site 600± feet. Based on distance of the septic system and topographic <br /> cross-gradient position relative to the canal, the canal is not anticipated to be affected <br /> by percolating effluent. <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 /> indicate that the proposed development is anticipated to be below the MCL. <br /> 2.4.2. Methods of Mitigation <br /> Nitrate mitigation measures appears unwarranted. <br /> 3.CONCLUSIONS AND RECOMMENDATIONS <br /> Three percolation tests (B1 at 9.8 feet, B2 at 6.8 feet and B3 at 3.0 feet bgs) were <br /> conducted on the site. The soils encountered in the percolation test borings consisted <br /> primarily of silty sand with intermittent bed layers of sandy silt. The soil borings <br /> demonstrated adequate percolation rates of 50.0 (B1), 5.68 (B2) and 35.71 (B3) <br /> minutes per inch. <br /> Facilities I Environmental I Geotechnical I Materials 18 <br />