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eh <br />ESPEY, HUSTON & ASSOCIATES, INC. <br />r 1 <br />L J <br />change to be expected of the soil material with changes in moisture content. In <br />general, soils with a high shrink-swell potential are hazardous if used in building <br />materials or as a foundation. <br />The reaction is the intensity of acidity or alkalinity of a soil, expressed <br />in pH values. A pH of 7.0 is neutral; a lower value indicates acidity and a higher <br />value indicates alkalinity. The pH values range from about 7.8 to 8.9• Since these <br />values are not especially high for soils high in calcium cazbonate, the corrosiveness <br />of the soil solution would not seriously damage pipelines. Salinity affects the <br />suitability of the soils for plants, its stability when used as construction material, <br />and its corrosiveness to other materials. <br />Table I-13 gives the interpreted engineering properties of soils, including <br />ratings of soils as a source of topsoil, sand, gravel, roadfill, sanitary landfill cover <br />• materials, and cover of spend shale deposits, and rating of their limitations as <br />foundations for low buildings, septic tank filter fields, sewage lagoons, and shallow <br />excavations. Soil features affecting their use as pond-reservoir azeas or for <br />embankments to hold water aze also shown. Interpretations aze based on SCS Soil <br />Interpretation Records, test data, and field experience with soils in the azea and <br />similar soils in other areas. It should be emphasized that the interpretations made <br />in this survey aze not a substitute for on-site sampling and testing needed at a site <br />chosen for specific engineering work that involves heavy loads, or a site where <br />excavations aze deeper than the depths of the layers here reported. <br />The soils were rated on the degree and kind of limitation affecting their <br />use as septic tank absorption fields, sewage lagoons, sanitary landfill, dwellings with <br />and without basements, and local roads and streets. The ratings aze as follows. <br />S1iRht means that the soil has a few limitations that are easily overcome. Moderate <br />means that the soil has limitations that can generally be overcome by proper <br />planning, cazeful design, and good management. Severe that the soil <br /> <br />I-84 <br />