Laserfiche WebLink
Soil Suitability/ Nitrate Loading Study <br /> Ripon Winery Proposed Warehouse ■ Ripon, CA 1 rerracon <br /> January 20, 2017 ■ Terracon Project No. NA167059 <br /> Based on the results of the two 10 foot deep soil borings,the proposed new leach field is expected <br /> to be located within fine to medium grained sitly sandy soils from 0.0 feet bgs to 8.0 feet bgs with <br /> a lean clay layer between 8.0 and 10.0 feet bgs. Based on the silty sandy soils encountered <br /> during our borings and anticipated percolation rate, a denitrification estimate of 15 percent is <br /> anticipated. <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 loadinl,, <br /> calculation for the site. A copy of the nitrate loading calculation is inclu din Appendix E. <br /> Table 8. <br /> Summary of Nitrate Mass Balance Equation. <br /> Result Average Effluent Leachfield Deep <br /> Parcel (Nc)* Acres (A) Daily Flow Concentration Denitrification Percolation <br /> (mg/L-N) (Q) (gpd) (Nw) (d) of Rainfall <br /> (mg/L-N) (R) (in) <br /> 1 2.3 77.56 377.54 85 15% 3.54 <br /> Maximum conta nt I (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 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 <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 /> Because of the favorable result of the nitrate loading calcula ' n, no mitigation measures are <br /> warranted. <br /> Responsive ■ Resourceful ■ Reliable 15 <br />