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P=0.41Td2x-hx9.833x10"2 <br />WHERE: d=diameter of boring in inches, h=depth of gravel pack in feet, <br />P=purge volume in liters <br />If gravel pack is unknown then: <br />1. h=depth of boring <br />2. Omit 0.4 factor <br />REMARKS ' -1 9 -if) 3q <br />