Flocculent Treatment Management Plan
9.
Water Quality Discharge Monitoring Programme (WQDMP)
Condition 174 of the A2N resource consent details the requirements of the WQDMP. These are addressed as follows.
9.1 Sampling locations The sampling locations within the CSA are identified in the SSESCPs for the Mt Eden Enabling Works. Typically, the daily sampling will be undertaken at the outfall of each sediment retention device (SRP, Decanting Earth Bund or containerised device). The weekly sampling will be undertaken at the lowest stormwater manhole within or immediately below the CSA.
9.2 Monitoring parameters 9.2.1. Daily Daily sampling and measurement will be made of: • • •
Water clarity Turbidity pH
(cm) (NTU)
9.2.2. Weekly Weekly sampling and measurement will be made of: • • • • • • • •
Total Suspended Solids g/m3 Total recoverable copper g/m3 Dissolved copper g/m3 Total recoverable zinc g/m3 Dissolved zinc g/m3 Total petroleum hydrocarbons g/m3 Ammoniacal nitrogen g/m3 Nitrate nitrogen g/m3
9.3 Monitoring methods 9.3.1. Daily The method of daily monitoring will depend on the sediment retention device utilised. For the majority of devices this monitoring will be undertaken manually with a grab sample taken at the outlet. For the measurement of clarity this outflow will be collected in a 20L bucket, with the clarity then measured using a 100mm black disk. The turbidity will be measured utilising a handheld turbidity meter. The pH will also be measured using a handheld pH meter. This monitoring will be recorded on daily record sheets detailing the following information: Page 27
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