The ionic character of a groundwater is defined by the following hypothetical combinations: Ca(HCO3)2 = 3.0 meq/l Mg(HCO3)2 = 0.4 meq/l MgSO4 = 0.8 meq/l Na2SO4 = 0.2 meq/ NaCl = 0.6 meq/1 Draw a milliequivalents-per-liter bar graph. Is the hardness of this water considered excessive? What process do you recommend for precipitation softening of this water