The following investigational allowances shall be permitted:

Investigational Allowance

Boron Guarantee (Below Guarantee)

Percent Percent

Up to .019 .005

.02 to .029 .010

.03 to 10 .015

.11 to .20 .03

.21 to .30 .06

.31 to .50 .09

.51 and above .12

History Note: Authority G.S. 106‑673;
Eff. January 1, 1985;
Pursuant to G.S. 150B-21.3A, rule is necessary without substantive public interest Eff. March 24, 2019.