10.2.1 pH, oil content (as measured by PAH levels),
and turbidity should be continuously monitored and recorded as recommended
in section 7 of these Guidelines. The monitoring equipment should
also meet the performance criteria described below:
pH
10.2.2 The pH electrode and pH meter should have
a resolution of 0.1 pH units and temperature compensation. The electrode
should comply with the requirements defined in BS 2586 or of equivalent
or better performance and the meter should meet or exceed BS EN ISO
60746-2:2003.
PAH
10.2.3 The PAH monitoring equipment should be
capable to monitor PAH in water in a range to at least twice the discharge
concentration limit given in the table above. The equipment should
be demonstrated to operate correctly and not deviate more than 5%
in washwater with turbidity within the working range of the application.
10.2.4 For those applications discharging at lower
flow rates and higher PAH concentrations, ultraviolet light monitoring
technology or equivalent, should be used due to its reliable operating
range.
Turbidity
10.2.5 The turbidity monitoring equipment should
meet requirements defined in ISO 7027:1999 or USEPA 180.1.
Temperature recording