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Mr William Waldron <br />5 April 1996 <br />Page 2 <br />of an iron property monument between your tfdcts. This temporary <br />datum was assigned an arbitrary reference elevation of 100.00. <br />Attached are logs of the borings. They were accomplished by the <br />hand auger method for greater accuracy. The borings generally in- <br />dicate normal topsoil, generally an organic loam, of normal depth <br />in upland areas, thicker towards wetlands. Basal soils are clay <br />loams, soft at first, medium with depth. Soil moisture levels var- <br />ied considerably. All borings were terminated at 2.5' to 51, less <br />than the usual 8' as restricting layers had been encountered. Refer <br />to the boring logs for a more detailed description (color, ocisture <br />level, gravel contents, etc) of soils encountered. <br />Standing vat )bserved in the bore holes. However, and <br />more imports ng of soil was encountered between 1.6' and <br />4' of depth Is. Mottling is a certain banding or stain- <br />ing of soil. r dhen soils are periodically saturated. It <br />is usually *a" nce of a past, and thus future, groundwa- <br />ter fluctuation. LOW;. of treatment systems must be separate from <br />maximum anticipateu water, perched or otherwise, by at least three <br />feet. Hence, you will need a mound system as higherst mottling is <br />1.6' below surface level. <br />We separated the site into two areas, a primary and alternate site, <br />and prepared six test holes in the lower area and three test holes <br />in the upper area, each to a depth of 13"-14" below present surface <br />level. This shallow depth establishes percolation rates of soils <br />that will be in contact with oroposed systems. Soils encountered <br />are essentially consistent with soil boring results. As the initial <br />fill of 12" of water did not drain out of the percolation teat <br />holes in less than 10 minutes, holes were kept wet for the required <br />4 hours. Tests were performed the next day, in accordance with <br />Minnesota Rules Chapter 7080. In some instances, the recording in- <br />terval was adiusted so that i approximate drop in water level of <br />1" between readings was eff... Led. <br />Transcribed forms of the percolation tests showing recordings and <br />other data are enclosed. Original data sheets are on file with us, <br />should anyone wish to view them. Reults are as follows, all within <br />allowable design ranges: <br />Test Hole No Percolation Rate, min/in <br />1 5.3 <br />2 7.4 <br />3 5.1 <br />4 17.4 <br />5 7.9 <br />6 10.5 <br />