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SA 1 SA 1 SANITARY LAND FILLS 't <br /> 107 <br /> blanketed with a deeper leveling fill, such exposures are not common: <br /> T. Below the surface, however, the fill is quite active. Biological decompo= ' <br /> sition goes on continuously, perhaps aerobically near the surface and anero- <br /> bically deeper and below the ground-water level. At the same time, segments �. <br /> of the fill may be active chemically and can react with one another. Some <br /> of the products of biological decay may be chemically active and will react <br /> with other materials making up the fill. At the same time, physical changes <br /> DEPTH ELEV. . PENETRATION-BLOWS PER FT. } <br /> FT. DESCRIPTION <br /> 1190 0 10 20 30 40 60 80100 <br /> e <br /> 0 <br /> 1180 <br /> ALTERNATE LAYERS OF CLAYEY <br /> SANDY SILT,GARBAGE AND RUBBISH <br /> SANITARY LAND FILL ' <br /> a <br /> 1175 '" <br /> 2 <br /> t`r <br /> 1170 <br /> 22.0 1165 <br /> tl <br /> HARD GRAY AND BROWN SANDY <br /> 1160 <br /> MICACEOUS SILT(PARTIALLY v <br /> DECOMPOSED GRANITE GNEISS) <br /> 1•f e <br /> } i <br /> 35.0. <br /> BORING TERMINATED <br /> i <br /> 1150 <br /> M1' <br /> FIG. 3.—TEST BORING IN A CONTROLLED SANITARY LAND FIL !, <br /> L <br /> IN NORTH GEORGIA <br /> take place. Part of these physical changes result from the volume changes a <br /> associated with boto biological and chemical activity. 'i'here are significant a x <br /> changes produced by moisture percolating through the fill and by the:effects <br /> of heat generated by .biological and chemical decomposition. The continuing <br /> weight of the fill and the covering fill produce physical changes. All of these <br /> effects may be time-dependent. Most are related tothe environment, particu- <br /> larly rainfall, temperature, and the level of ground water. <br />