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Nitrate Loading Study Irerracon <br /> Roque Property e Victor, California <br /> July 6, 2018 ■Terracon Project No. NA187032 <br /> 3.5.3 Impact of Nitrate Loading to Nearby Water Sources <br /> Based on a review of the USGS, Lockeford (1993) and Waterloo (1978) California Quadrangles <br /> topographic map (Appendix A), the site is located at approximately 75 feet above mean sea level <br /> with a topographic gradient toward the west direction. The nearest surface water source to the <br /> site is the Mokelumne River located approximately 4,000+ feet north of the site. As the subject <br /> property is relatively flat, we do not foresee percolating effluent affecting the surface water <br /> resources. <br /> 4.0 DISCUSSION OF NITRATE LOADING RESULTS RELATIVE TO PROPOSED <br /> METHOD OF WASTEWATER DISPOSAL <br /> 4.1 Total Nitrate Impact <br /> Based on the method and assumptions described, the result of the nitrate loading balance <br /> indicates that the proposed residential use on the site may cause a buildup of nitrates in the <br /> aquifer above the MCL of 10 mg/L-N. <br /> 4.2 Methods of Mitigation <br /> Based on the proposed usage, mitigation may be required by the County. Mitigation may consist <br /> of the utilization of an advanced water treatment product such as those available by Orenco and <br /> others, which are specifically designed to lower nitrates at point of discharge. <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the nitrate loading results, the proposed residential use has the potential to cause an <br /> increase in nitrates above the MCL when an average two person occupancy is calculated per <br /> bedroom. If the EHD requires site mitigation for the project, an engineered packaged septic <br /> system (such as those available by Orenco and others) specifically designed to lower nitrates at <br /> point of discharge may be used. <br /> Responsive■ Resourceful ■ Reliable 8 <br />