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I <br /> ! <br /> I <br /> i <br /> I <br /> I <br /> I <br />-I <br /> <br />Mr. Ray Johnson <br /> <br />- 2 - July 29, 1980 <br /> <br />The water table condition at the site is apparently caused by the perching of <br />ground water above an impermeable silty clay horizon which occurs below the <br />fine sand surface horizons. A system of underdrains should be installed at <br />the sand-clay interface to regulate the elevation of the water table near the <br />proposed building. Underdrains should be kept at least 20 feet from the <br />perimeter of the septic system. Because of the low position of the site <br />relative to local relief, the underdrain system should be connected to a storm <br />sewer system with an appropriate outlet. <br /> <br />Yours truly, <br /> <br />NSON ANDERSON ASSOCIATES, INC. <br /> <br />Carl E. Anderson, P. E. <br /> <br />CEA/jkw <br /> <br />File: 521.01 <br /> <br />?/ <br /> <br /> <br />