Wood preservation facilities, pentachlorophenol pressure: chapter E, table 3

Maximum acceptable^Footnotea concentration (MAC) = 0.06 mg/L (60 µg/L)

Aesthetic objective (AO) ≤ 0.03 mg/L (30 µg/L)

Protection of human health (drinking water)

The odour threshold (AO), is more sensitive than the toxic threshold for humans (MAC)

Short-term maximum contaminant level (MCL) = 1 mg/L (1 ppb) for 1 day or 0.3 mg/L for 10 days.

0.022 mg/L is the long-term maximum contaminant level

Criteria:

Examples ^Footnotee
5.5 µg/L at pH 6.5
20 µg/L at pH 7.8
68 µg/L at pH 9.0

Protection of freshwater biota

• 1-hour average concentration not to exceed the criterion more than once every 3 years on the average

• 4-day average concentration not to exceed the criterion more than once every 3 years on the average

Protection of saltwater biota

• 4-day average concentration not to exceed the criterion more than once every 3 years on the average

• 1-hour average concentration not to exceed the criterion more than once every 3 years on the average

Oil and petrochemicals should not be present in concentrations that

• can be detected as visible film, sheen or discoloration on the surface;
• can be detected by odour;
• can cause tainting of edible aquatic organisms; and
• can form deposits--on shorelines and bottom sediments--that are detectable by sight or odour, or are deleterious to resident aquatic organisms.