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472 FINK Internelionel Symposium on Salt-Northern Ohio Geological Society <br />~-Extension <br />~ W.5 <br />i <br />i <br />i <br />i <br />Om. ~ <br />100n <br />200 r <br />300r <br />i <br />Figure S. Idealized section over subsidence area 2 of \Vell 4 <br />What can be done with these results? The purification <br />tanks have numbers that correspond with the numbers in the <br />first column of Table 2. The next two columns of Table 2 <br />give some more information about these tanks, such as their <br />diameters and the distances from their nearest and farthest <br />point to the censer of the bowl. From the map, the average <br />tilt in minutes of the tank can be easily read and this figure <br />can be recalculated to a [ilt in centimeters on the basis of the <br />zone~t~Compression <br />i <br />i WELL 4 <br />zone ---+-Extension zoned <br />i i <br />W.3 W.2 i <br />VACUUM PLANT ~ <br />~~ I <br /> <br />:.::: Purification plant i <br />i <br /> <br />~~\ <br />45° I/ 80 <br />r 1 <br />450 <br />~~~ ~ <br /> // <br />~\ AREA OF SUBS I DE NCE ~~ <br /> ~ I// r TERTIARY <br /> ~ tv/ <br />~ I i <br />i <br /> ~ I <br />~ ~ <br />~ <br />t. ~ <br /> ~ I I <br />~~1 i~ <br /> 136 m. 90m. ^ <br />I 92m. - <br /> t ~/~ <br />I <br />C H I M N E Y <br />~ / <br />BUNTER <br /> I <br />l <br />I <br />I I <br />i <br /> I <br />t. <br />I <br /> <br />CA I <br />CAV <br />V/TY /TY <br /> SALT SALT <br />diameter of the tank. All the expected movements of con- <br />struction fratures on the surface within this area can be <br />found from this kind of table. 1Vith these figures it was easy <br />to arrange a long-term planning for preventive maintenance. <br />For example, the purification tanks were jacked up and put <br />on a mound of stabilized sand to restore the flow direction <br />between the tanks. The height of these mounds was calcu- <br />lated from the tables, as was the expected tilt. All tanks <br /> <br />