(percent by weight passing 20 mesh sieves - percent by weight passing 60 mesh sieves) x 0.4 = (a)
(percent by weight passing 60 mesh sieves - percent by weight passing 100 mesh sieves) x 0.8 = (b)
(percent by weight passing 100 mesh sieves) x 1.0 = (c)
[(a+b+c) x Calcium Carbonate Equivalent (CCE)] divided by 100 = ENV;
Total Calcium (Ca)...%
Total Magnesium (Mg)...%
Va. Code § 3.2-3706