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<br /> <br />Case History <br /> <br />The Colorado Highway Department, recognizing that severe <br />hydrocompact i on a long a highway a Ii gnment cou I d tota II y <br />destroy a road. I nvest I gated the potent I a I for hydrocom- <br />paction along the al ignment of 1-70 from Rifle to Debeque. <br />Water was Impounded in a small pond and a road fi II was <br />p I aced bes I de the pond as a mode I of probab I e future <br />conditions. The result of the tast was that the ground <br />surface sank three feet in one month. The test prey I dad <br />design information to prevent the possible future total <br />failure of a portion of the highway. The engineering <br />geologic investigation may have saved taxpayers mill ions of <br />do I I ar s. <br /> <br />Case History <br /> <br />At Golden, abandoned clay pits were used as a refuse dump. <br />I n the 1960 I 5 at ter the pits were "f I I I ad", a res i dent i a I <br />housing complex was bui It on sites for the Colorado School of <br />Mines. Sidewalks, streets, and two story buildings have <br />sustained substantial damage from settlement. The problem <br />continues despite repeated repairs and some corrective work. <br /> <br /> <br />~ <br />4't' ' .'~ <br />""'..... .".- <br />- <br />ft. ~>,.."'h" <br /> <br />These clay pits near Go I den are s i mil ar to those over wh i ch <br />married student housing at the Colorado School of Mines was <br />bu I It. These pits. when f i I led with organ i c and uncompacted <br />debris, became man-made sources of col lapsing soi Is. <br /> <br />44 <br />