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,OVERCOMING UNDERGDOUND WA'T'ER PRESSURES FOR IiDROS";VJ'IS TANK TESTING <br />WITH . INTERNAL ADVANTAGE OF 1., psi <br />CALCULATION SHEET <br />(1) SUBTRACT (Y -X) <br />(Y -X).036 ] 1: 5 .4-Y <br />77.77., <br />(2) TAKE RESULT OF <br />(1) <br />AND MULTIPLY BY .036 <br />(3) TAKE RESULT 'OF <br />( 2 ) <br />AND ADD 1. 5 <br />(4) TAKE RESULT OF <br />(3) <br />AND DIVIDE BY r <br />'yy•3 q <br />(5 ) TAKE RESULT OF <br />( 4 ) <br />AND SUBTRACT Y �/ �, 3 % <br />— = —oZ q,61 <br />(6) THE RESULT OF (5) EQUALS THE NUMBER OF INCHES OF PRODUCT ABOVE GRADE <br />A/O t`)-1 ER fkPSPr�% <br />