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Soil Suitability / Nitrate Loading Study r Terracon <br /> FLAG CITY TRUCK AND EQUIPMENT PARKING FACILITY I Lodi, California <br /> October 6, 2023 1 Terracon Project No. NA237081 <br /> 2.3.2. Contribution of Rainfall <br /> An estimate of the quantity and quality of rainfall was required for the nitrate loading <br /> analysis. Average precipitation and potential evapotranspiration (ETo) data was obtained <br /> from the California Irrigation Management Information System (CIMIS) from the Lodi <br /> (49) and Lodi West (166) stations. The estimate first determines whether the average <br /> monthly precipitation exceeds average monthly evapotranspiration (ET). If so, then the <br /> difference is potential rainfall recharge. Due to the relatively flat nature of the site runoff <br /> should be minimal. In February 2020, the EHD approved an adjustment to the <br /> evapotranspiration (ET) rate based on net rainfall recharge calculation utilizing <br /> University of California (UC) plant factors (PF) for established landscape plants. Terracon <br /> calculated the ET adjustment factor (actual ET) based on the proposed commercial <br /> landscape. Refer to Appendix F Water Balance Recharge Analysis for monthly <br /> precipitation and ET averages. <br /> Table 9. <br /> Net Rainfall Recharge <br /> CIMIS Station Average Precipitation Potential ETO ET Actual ET Net Rainfall <br /> Number / Adjustment Recharge <br /> Location (in/year) (in/year) Factor (in/month) (in/year) <br /> 49/Lodi 166/West 15.47 50.92 0.12 23.23 12.47 <br /> Lodi <br /> Based on this method, the average net rainfall recharge for the site is estimated to be <br /> 12.47 inches/year. <br /> The nitrate concentration of rainfall is estimated to be 1 mg/L-N (Hantzsche and <br /> Finnemore, 1992). <br /> 2.3.3. Current On-Site Sources of Nitrate <br /> The current on-site sources of nitrate include the natural processes. <br /> 2.3.4. Future On-Site Sources of Nitrate <br /> Future on-site sources of nitrate will include a proposed septic systems, and natural <br /> processes. <br /> 2.3.4.1. Quantity and Quality of Wastewater from Project <br /> The following discussion is for determining the long-term wastewater flow generated <br /> from the proposed development for the nitrate loading analysis and should not be used <br /> Facilities I Environmental I Geotechnical I Materials 16 <br />