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4 [6] SOIL PROFILE AND PERCOLATION TESTING <br /> Information from the drilling of three domestic wells in the area <br /> of the subject site were obtained from the San Joaquin Department <br /> of Environmental Health. The Well Logs illustrate a diverse soil <br /> structure of primarily sands clays, hardpan and <br /> f ► Y . p gravels. There <br /> f is a hardpan layer approximately three to six feet under the <br /> subject site. Clay lenses can be found within the soil strata at <br /> lower depths (30-50 feet) . These clay layers can act as barriers <br /> against any downward movement of contaminants. <br /> The percolation tests were performed in accordance with the San <br /> Joaquin Environmental Health Department regulations. A copy of the <br /> percolation test results can be found in the Appendix. <br /> The predominate soil type encountered during the drilling to <br /> conduct the percolation tests was a gravelly sand structure. This <br /> type of structure is conducive to an excellent percolation rate for <br /> the sewage effluent. The results of this percolation test are <br /> discussed in the Conclusions section of this report. <br /> p rt. <br /> k <br /> [7] CONCLUSIONS <br /> The results of the percolation tests reveal an exceptionally fast <br /> percolation rate of less than one minute per inch for strata that <br /> ' are located between 13 and 18 feet below the soil surface. This <br /> percolation rate translates to a recommended sewage disposal area <br /> of 12,000 square feet. The sewage pits can be locate I <br /> d within this <br /> strata to promote adequate percolation of the effluent. As noted <br /> above, the water table is approximately 48 feet below the soil <br /> surface; therefore, this groundwater level is certainly well below <br /> the ten foot minimum distance between the bottom of the sewage pits <br /> FJ (approximately 18 feet) and the highest anticipated depth to <br /> groundwater. <br /> 4 Based upon this information concerning the placement of the <br /> proposed sewage pits within the soil profile, and the highest <br /> E anticipated depth to groundwater, there should not <br /> be any adverse <br /> impact to the quality of the local area groundwater from this <br /> proposed septic system. <br /> F �,w <br /> �.; �alitg �ontrol Inspectiax <br />