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CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined on each proposed parcel of the Site were <br /> found to be suitable for standard septic systems. Satisfactory soil percolation rates of <br /> 2.69 min/in were observed in the shallow soil zones at the test locations on each parcel. <br /> The soil in the test locations was found to be sandy silt and silty sand on Parcel 1; <br /> sandy silt was identified on Parcel 2. <br /> Based on maps of recent aquifer levels, the depth of ground water is approximately 75 <br /> to 85 feet below ground surface. Ground water flows generally to the north or northeast <br /> in the area at a rate of approximately 20 to 24 feet per mile. <br /> The orchard on the Site was recently removed. As a result, no irrigation activities are <br /> taking place at this time. No water sample was collected. Maps of testing data indicate <br /> that some nearby wells exhibit elevated levels of nitrate and DBCP. <br /> Based on the methods and assumptions described, the nitrate loading calculations <br /> indicate that hypothetical future on-site septic systems on the Site have the potential to <br /> cause a buildup of nitrate in the aquifer up to 1.2 mg/L-N for a four-bedroom house and <br /> a three-bedroom house on each parcel. This value is well below the MCL of 10 mg/L-N. <br /> Because of the favorable results of the nitrate loading calculations, no nitrate mitigation <br /> is recommended for future residential development up to two houses per parcel. <br /> Any future septic system construction should follow the San Joaquin County On-Site <br /> Wastewater Treatment Systems Standards (2017) where applicable. In this area, most <br /> septic systems utilize leach lines and sumps. No new construction is anticipated at this <br /> time. <br /> LOGE 2307 Page 14 <br />