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• CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the proposed septic system drain field <br /> appear to be suitable. A satisfactory soil percolation rate of 19.2 minutes per inch was <br /> observed. <br /> The depth of ground water based on recent aquifer levels is approximately 69 to 74 feet <br /> below the ground surface, depending on the season. The ground-water flow direction is <br /> toward the northeast at a rate of approximately seven to eight feet per mile in the vicinity <br /> of the Site. <br /> No water sample was collected for this study because no wells are located on the Site. <br /> Water service is provided by Cal Water. <br /> Based on the current project, 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 9.65 mg/L-N. <br /> This level falls below the US EPA drinking water recommendation of 10 mg/L-N. In fact, <br /> the actual impact to the aquifer will be much less since the nitrate loading equation is <br /> conservative and overestimates impacts. <br /> We believe the Site suitable for the use of a standard septic system utilizing leach lines <br /> and seepage pits. Based on the satisfactory result of the nitrate loading calculation, no <br /> • nitrate mitigation is recommended at this time. <br /> • LOGE 1806 Page 11 <br />