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3 The established rule of thumb is that the purge volume should be equal to or greater than three well <br />volumes (nr2 x height of standing water in well) <br />4 Al, As, Ba, Ca, Cl, Co, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Rb, S, Si, Sn, Sr, Th, Ti, U, V, <br />W, Y, Zn, Zr <br /> <br />ii