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<br />(FIRST DRAFT - SUBJECT TO CHANGE) <br /> <br />The low, moderate, and high class designations are <br />applied to the entire soil profile from 0 to 110 inches or from the surface <br />to bedrock whichever is shallower. <br /> <br />Frost action potential. Is the possible upward or lateral movement of soil <br />by the formation of ice lenses and the subsequent collapse upon thawing. <br />Estimates of potential frost action are ~ade of bare soil, not covered with <br />vegetation or snow. Soil moisture and soil temperature are the two most <br />important factors affecting frost action. <br /> <br />Three classes of potential frost action ,are used: <br />low, moderate, and high. They are defined as follows: <br /> <br />Low _ Soils rarely subject to the formation of ice lenses. <br />Moderate - Soils susceptible to the formation of ice lenses resulting <br />in moderate frost heave and subsequent collapse. <br />High - Soils highly susceptible to the formation of ice lenses <br />, resulting in maximum frost heave and subsequent collapse~ <br /> <br />DEGREE OF SOIL LIMITATION and major feat~es affecting selected uses. <br /> <br />Three degrees of limitations are used in the table as follows: <br /> <br />Slight - Relatively free of limitations or limitations are easily <br />overcome. <br />Moderate - Limitations need to be recognized, but can be overcome with <br />good management and careful design. <br />Severe,. Limitations are severe enough to make use questionable. <br /> <br />The interpretations will not eliminate the need for on-site study, testing, <br />and planning .of specific sites for the design and construction for specific <br />uses. The interpretations can be used as a guide to planning more detailed <br />investigations and for avoiding undesirable sites for an intended use. By <br />using the soil map and interpretations, it is possible to select sites that <br />have the least limitations for an intended use. <br /> <br />Many somewhat poorly and poorly drained soils have severe or very severe <br />limitations in their natural condition. These same soils, when drained <br />artificially, may only have a slight limitation. Modern equipment and <br />knowledge make it possible to overcome most of the limitations of soils for <br />many urban and recreational uses. The degree of the limitation and the <br />location of the soil will determine the practicability of developing the <br />soil for the intended use. No consideration was given in these interpreta- <br />tions to the size and shape of soil areas, nor to the' pattern they form <br />with other soils on the landscape. For example, some very desirable soil <br />areas are too small in size or too irregular in shape, or their occurrence <br />with less desirable soils forms a. pattern too complex to be utilized for <br />the intended use. Although not considered in the interpretations, these <br />items should influence the final selection of a site. <br /> <br />Septic tank filter fields. The_ septic tank filter field is a part of the <br />septic tank absorption system for on-site sewage disposal. It is a sub- <br />surface tile system laid in such a way that effluent from the septic tank is <br />distributed with reasonable uniformity into the natural soil. Criteria and <br /> <br />(3) <br /> <br />-[ <br />I <br />