WAC 16-200-7064
What are the Washington standards for
metals? (1) The standards for metals in Washington are the
maximum acceptable annual metals additions to soils adopted in
RCW 15.54.800 and are presented in Table 2. Because the Canadian
standards contained in the Canadian Trade Memorandum T-4-93 dated
August 1996 are based on long-term (forty-five-year) cumulative
metals additions to soils, the maximum acceptable annual metals
additions to soils are determined by dividing the Canadian
standards by forty-five. The Washington standards are expressed
as pounds per acre per year.
Table 2. Washington Standards For Metals.
| Metals |
Lbs./acre/yr. |
| Arsenic (As) |
.297 |
| Cadmium (Cd) |
.079 |
| Cobalt (Co) |
.594 |
| Mercury (Hg) |
.019 |
| Molybdenum (Mo) |
.079 |
| Nickel (Ni) |
.713 |
| Lead (Pb) |
1.981 |
| Selenium (Se) |
.055 |
| Zinc (Zn) |
7.329 |
(2) To be registered with the department and distributed in
Washington, a commercial fertilizer must not exceed the above
standards. Because cobalt (Co), molybdenum (Mo), and zinc (Zn)
are also plant nutrients, higher concentrations than those
presented in the table may be permitted. Commercial fertilizers
which contain cobalt (Co), molybdenum (Mo), and/or zinc (Zn)
concentrations may be registered and distributed in Washington if
those metals are used as plant nutrients and those metals meet
all applicable minimum guarantees and labeling requirements of
chapter 15.54 RCW and the rules adopted thereunder.
(3) If a commercial fertilizer contains cobalt (Co),
molybdenum (Mo), or zinc (Zn) and any one or more of those metals
are not intended to be used as a plant nutrient, then the
nonplant nutrient metals must meet the Standards shown in Table
2.
[Statutory Authority: Chapter 15.54 RCW. 99-02-035, §
16-200-7064, filed 12/30/98, effective 1/30/99.]