Gravel packs, filter sand, or stabilizer materials must be comprised of mineral material or inert, nontoxic artificial materials, contain less than five percent calcareous material, and must be graded, cleaned, and washed. Gravel packs, filter sand, or stabilizer materials must not extend:
Minn. R. 4725.2850
Statutory Authority: MS s 103I.101; 103I.111; 103I.205; 103I.221; 103I.301; 103I.401; 103I.451; 103I.501; 103I.525; 103I.531; 103I.535; 103I.541; 103I.621; 144.05; 144.12; 144.383; 157.04; 157.08; 157.09; 157.13