2016-2017 53
2.11 Recommendations 53
3. Ahuroa Gas Storage 54
3.1 Process description 54
3.1.1 Site overview 54
3.1.2 Geological setting 54
3.1.3 Gas injection/extraction 55
3.1.4 Pressure monitoring 56
3.1.5 Pipeline to Stratford Power Station 56
3.2 Resource consents 58
3.2.1 Water discharge permit 59
3.2.2 Air discharge pemit 60
3.2.3 Discharges to land 60
3.3 Monitoring programme 61
3.3.1 Introduction 61
3.3.2 Programme liaison and management 61
3.3.3 Site inspections 61
Analysis of compliance, monitoring and enforcement metrics 2020-2021
Executive Audit and Risk Agenda March 2023
water balance assessment 53
3.3 Diversion from Manganui River 54
3.3.1 Intake headworks 54
3.3.2 Fish pass flows 57
3.3.3 Motukawa Race flows 58
3.3.4 Pumping from Mangaotea Stream 60
3.4 Lake Ratapiko 61
3.4.1 General description 61
3.4.2 Lake level fluctuations 62
3.4.3 Lake level duration and seasonality 64
3.4.4 Flood management 65
3.4.5 Spill flow and residual flow 66
3.5 Motukawa power station 68
3.5.1 Power station flows 68
3.5.2 Daily flow ramping 68
3.6 Scheme inflows and
Consent 4406-2.0 52
Table 34 Summary of performance for Consent 5036-2.0 53
Table 35 Summary of performance for Consent 9908-1.0 54
Table 36 Summary of performance for Consent 10208-1.0 55
Table 37 Evaluation of overall environmental performance over time 57
List of figures
Figure 1 Approximate stormwater catchments at the Whareroa site 11
Figure 2 Spring biomonitoring sites with taxa number, MCI scores and SQMCI scores for each site 17
Figure 3 Summer biomonitoring
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Kaupokonui Estuary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Waingongoro Estuary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Tangahoe Estuary . . . . . . . . . . .
discharge sampling (STW001142) 43
Table 21 Summary of performance for Meredith Metals: Consent 9912-1 44
Table 22 Summary of performance for Meredith Metals: Consent 9911-1 45
Table 23 Connett Rd eastern drain sampling results (site STW001061) 49
Table 24 Connett Rd, western drain sampling results (site STW001112) 50
Table 25 Summary of performance for NPDC: Consent 0608-3 (to 22 March 2017) 52
Table 26 Summary of performance for NPDC: Consent 0609-2 (to 22 March 2017) 53
Relationships between MCI, site altitude & distance from source for Taranaki ring plain streams (Stark Environmental Ltd).
Opunake Hydro Ltd consent monitoring report - Taranaki Regional Council.
Total hydrocarbons (C7 - C36) mg/kg dry wt 310 4,000 200 450
Benzene mg/kg dry wt 1.1 < 0.06 < 0.05 < 0.05 < 0.05
Toluene mg/kg dry wt 68 < 0.06 < 0.05 < 0.05 < 0.05
Ethylbenzene mg/kg dry wt 53 < 0.06 < 0.05 < 0.05 < 0.05
m&p-Xylene mg/kg dry wt 48 < 0.11 < 0.10 < 0.10 < 0.10
o-Xylene mg/kg dry wt 48 < 0.06 < 0.05 < 0.05 < 0.05
Total Recoverable Arsenic mg/kg dry wt 20 < 2 < 2 - -
Total Recoverable Cadmium mg/kg dry wt 1 < 0.10 < 0.10 - -
Total Recoverable Chromium mg/kg dry wt 600 11 9