Table 9.1       Summary of Water Quality Objectives for Marine Waters of Southern Water Control Zone

Parameter

Objective

Part(s) of Zone

E. coli

annual geometric mean not to exceed 610/100 ml

 

 

secondary contact recreation subzones; fish culture subzones

Dissolved Oxygen within 2 m of bottom

not less than 2 mg/L for 90% samples

 

 

marine waters

Depth averaged Dissolved Oxygen

not less than 4 mg/L for 90% samples

 

marine waters

 

PH value

within the range 6.5 to 8.5; change due to waste discharge not to exceed 0.2

marine waters

Salinity

change due to waste discharge not to exceed 10% of natural ambient level

whole zone

Temperature

change due to waste discharge not to exceed 2oC

whole zone

Suspended solids

waste discharge not to raise the natural ambient level by 30%, nor cause the accumulation of suspended solids which may adversely affect aquatic communities

marine waters

 

 

 

Nutrients

not to be present in quantities that cause excessive growth of  algae or other aquatic plants

 

annual mean depth-averaged inorganic nitrogen not to exceed 0.1 mg/L

marine waters

 

 

marine waters

Unionized Ammonia

annual level should not exceed 0.021 mg/L

whole zone