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Table 9. Summary matrix of relations between drilling criteria and drilling methods (modified from W. E. Teasdale, U.S. Geological Survey, written <br />commun., 1992) <br />[The relations given in this table generally apply; there are exceptions in some cases depending on specific techniques employed during drillingl] <br />W <br />N <br /> CRITERIA <br /> <br />VJ <br />.r7 <br /> <br />_N 00 <br />L? <br /> C <br />a O <br /> G .d '? O C C O" + <br />C E p w C <br /> Z O cva s E O .-. "" C <br />° i.. <br />• <br /> a G S w w a a' !3 ?? ° c <br />i Q <br />°y <br />' y <br /> <br /> <br />° <br /> <br />w U <br /> <br />' <br /> <br />D <br /> <br />g O O Ld E. <br /> <br />° <br />O <br />p h a?• <br />C <br />a v <br />METHODS . u <br />? c <br />7 r$ z 0;a a <br />v U a <br />Hollow-stem augering 1I J 1' <br />Solid-stem augering J 1I <br />Bucket-augering <br />Hand augering J J J J <br /> <br />Direct rotary--mud <br />J I <br />V <br />Direct rotary--air <br />Reverse circulation rotary <br />J <br />Cable tool (percussion) J J ?1 <br />Jet wash and <br />jet percussion <br />Driven wells (percussion) <br />1 Good formation samples obtained only when a sample tube is added to cable tool; otherwise samples are disaggregated.