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ti ,~ . <br />-s- • <br />Dwelling. The emphasis In rating soils for dwellings Is on the properties that <br />affect foundations, but also considered beyond the effects related exclusively . <br />to flwding, seasonal wetness, and other hydrologic conditions. Other Ilmita- <br />tlons to consider are slope, shrink-swell potential, potential frost action; <br />and depth to bedrock. <br />SanltarY landfill (trench typo). A dug trench to which refuse Is burled dally, <br />or more frequently If necessary, the refuse Is covered with a layer of soil <br />material at least 6 Inches thick. That material Is the soil excavated In dig- <br />ging the trench. <br />Because trenches as deep es 15 feet or morn are used for many landfills, geo- <br />logic Investlgatlon Is needed to determine the potential for pollution of <br />'' ground water as well as to ascertain the design needed. <br />:. <br />Septic Tank filter fields. The septic tank filter field Is a part of the septic <br />tank absorption system for on-site sewage disposal. It is a subsurface file <br />system laid In such a way that effluent from the septic tank Is distributed with' <br />• reasonable uniformity Into the natural soli. Criteria and standards used.tor <br />rating soils are made on the basis of factors such as soil depth, slope, per- <br />meabllity, percolation rate, water table, sell drainage, and overflow or flood-. <br />Ing hazards. Factors relating to water movement are for the soli between depths' <br />Of 24 and 60 Inches. Possibilities of underground water pollution are very <br />Important, but not considered in this guldu. They need separate consideration. <br />Sewage lagoons. A sewage lagoon (aerobic) Is a shallow lake used to hold sew- <br />age for the time required for bacterial docompositlon. Sewage lagoons require <br />consideration of the sells for two functions, (1> as a vessel for the Impounded <br />area and (2) as Boll material for the enclosing embankment. Sell characteristics <br />that affect ?heir use for sewage lagoons are--depth to water table, permeablliiy, <br />depth to bedrock, slope, coarse fragments, organic matter content, and flooding. <br />Corroslvity - Tho corrosion of uncoated stool Is a physical-biochemical process <br />-that converts Iron Into Its Ions. Estimation of corroslvlty for untreated steel <br />pipe Is commonly based on (1) resistance to flow of electrical current, (2) to- <br />tai acidity, l3) sell drainage, (4) soil texture, and (5) conductivity of sat- <br />. Lration extract. <br />Concrete materials placed In soli deteriorate to varying degrees. The rate of <br />deterioration is related to (1) the amount of sulfates and (2) soil texture and <br />acidity. <br />MAJOR SOIL FEATURES AFFECTING SELECTED USE <br />For Information pertaining to this section In developing a subdivision <br />plan, contact the nearest Soll Conservation Service Flold office. <br />DEGREE OF SOIL LIMITATIONS AND MAJOR FEATURES AFFECTING RECREATION USES <br />Campsites (intensive use). Areas to be usod~for font and small camp trailer <br />sites and the accompanying of outdoor living. Little site preparation other <br />