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Dear Mr. and Mrs. Molin: <br />As requested soil borings and percolation tests have been completed at <br />the above location. This investigation weis undertaken in order to deter­ <br />mine the current conditions of the existing on-site sewage disposal system <br />and to make recommendations to upgrade this system. <br />A rather intensive soil boring investigation was undertaken in order to <br />establish the groundwater levels and also to locate suitable sites for <br />percolation tests because of the limited area available for investigation. <br />A total of 8 shallow soil borings were completed in conjunction with three <br />deep borings. The boring indicated a relatively homogenous loam to clay <br />loam soil. See Table 1 for a conqplete description of the deep soil boring <br />logs. <br />The static groundwater level of soil boring 1 was 5.1 feet below land sur­ <br />face and 4.5 feet at soil boring 2. The static water level was not <br />recorded in soil boring 3. All groundwater level measurements were made <br />24 hours after borings were completed. Conventional on-site sewage disposal <br />systems could not be utilized 'in the vicinity of soil borings 1 and 2 <br />because of the high groundwater level, however, modified mound systems <br />could be utilized. See Figure 1. <br />The groundwater level does not pose a problem in the vicinity of soil <br />boring 3. <br />A total of six percolation test holes were installed. The percolation <br />rates ranged from a high of 11 minutes per inch to a low of 240 minutes <br />per inch. The results of the percolation tests are as follows: