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LOGE 1726: Phillips/Michael David NLS Addendum Page 10 <br /> September 20, 2017 <br /> • CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the proposed septic system drain field for the <br /> production office facility appear to be suitable. A satisfactory soil percolation rate of 1.6 <br /> minutes per inch was observed. <br /> Septic system construction utilizing leach lines or a filter bed should follow the San Joaquin <br /> County On-Site Wastewater Disposal Standards (2016) where applicable. Based on the <br /> guidance within this document, a percolation rate between 1 and 5 min/in requires 20 feet <br /> minimum separation from the bottom of the dispersal system to ground water. In the original <br /> Soil Suitability/Nitrate Loading Study (2015), Live Oak estimated depth to ground water at 25 to <br /> 31 feet below ground surface on the Site. This separation would allow for a standard system. <br /> Based on the proposed uses reported, the use of on-site septic tanks and drain field systems on <br /> the Site is not expected to cause a buildup of nitrate in the aquifer above 5.0 mg/L-N. This level <br /> falls below the US EPA drinking water recommendation of 10 mg/L-N. <br /> We believe the Site suitable for the use of standard septic systems. We do not anticipate that <br /> the ground water quality will be negatively impacted, and no nitrate mitigation is recommended. <br /> Sincerely, <br /> Live Oak GeoEnvironmental, Inc. <br /> • /� <br /> NAL <br /> Abigail <br /> gF� <br /> Abigail cco, Environmental Professional <br /> 4 DAVID J.WELCH <br /> N0.2151 <br /> CERTIFIED <br /> ENGINEERING <br /> David Welch, Engineering Geologist GEOLOGIST \P <br /> CEG-2151, CHG-653, PGP-1049 �TFOFCALIFO\� <br /> CC: Elwyn Heinen <br /> Advanced Design Group <br /> 11286 Ih St. <br /> Modesto, CA 95354 <br /> Attachments: <br /> Plate 1. Proposed Development <br /> Plate 2. Site Map <br /> Plate 3. Percolation Test Location <br /> Plate 4. Soil Log and Percolation Test Results <br /> Plate 5. Nitrate Loading Calculation <br /> Percolation Test Permit <br /> Percolation Test Form <br /> • <br />