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(b) Criteria for priority toxic pollutants in Washington. The applicable human health criteria are shown in Table 1 to paragraph (b).
Table 1 to Paragraph (b)—Human Health Criteria for Washington
| A | B | C | ||||||
|---|---|---|---|---|---|---|---|---|
| Chemical | CAS No. | Cancer slope factor, CSF (per mg/kg·d) |
Relative source contribution, RSC (−) |
Reference dose, RfD (mg/kg·d) |
Bio-accumulation factor (L/kg tissue) |
Bio-concentration factor (L/kg tissue) |
Water & organisms (µg/L) |
Organisms only (µg/L) |
| (B1) | (B2) | (B3) | (B4) | (B5) | (C1) | (C2) | ||
| 1. Arsenic* | 7440382 | 1.75 | 44 | a0.018 | a0.14 | |||
| 2. Bis (2-Chloro-1-Methylethyl) Ether** | 108601 | 0.50 | 0.04 | 10 | 400 | 900 | ||
| 3. Methylmercury | 22967926 | 2.7E-05 | 0.0001 | b0.03 (mg/kg) | ||||
aThis criterion refers to the inorganic form of arsenic only.
bThis criterion is expressed as the fish tissue concentration of methylmercury (mg methylmercury/kg fish). See Water Quality Criterion for the Protection of Human Health: Methylmercury (EPA-823-R-01-001, January 3, 2001) for how this value is calculated using the criterion equation in the EPA's 2000 Human Health Methodology rearranged to solve for a protective concentration in fish tissue rather than in water.
*These criteria were promulgated for Washington in the National Toxics Rule at 40 CFR 131.36, and are moved into 40 CFR 131.45 to have one comprehensive human health criteria rule for Washington.
**Bis (2-Chloro-1-Methylethyl) Ether was previously listed as Bis (2-Chloroisopropyl) Ether.
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