ANNUAL REPORT 2017 to 2018

Transcription

1

2 Wastewater Discharge Consent CD130214W Annual Report 1 July 2017 to 30 June 2018 (Final) Prepared by: Matthew Morris Apex Environmental Independently Reviewed By: Stantec ii

3 REVISION SCHEDULE Rev No Date Description Prepared By Reviewed By Approved By 1 27/9/18 Final M Morris S Kroening D James 2 3 iii

4 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Executive Summary The purpose of this report is to assess compliance with Consent CD130214W. The consent is for the discharge of the Final Treated Wastewater (Domestic and Non-Separable Industry (DNSI) treated wastewater and the Separable Industrial Wastewater) discharged through a long ocean outfall (2.75km) into Hawke Bay. The level of compliance with the consent is very high. The DNSI treatment and contaminant concentration levels were reduced at varying rates by the treatment system. On an annual level there were significant reductions in concentrations. Ho wever, on some days during the 4 th quarter, the removal rates were as low as 9.7% for TSS. However, this was still compliant as discussed in more detail in Section 5.3. Overall the treatment system performed well. A trend analysis was carried out and this showed increasing and decreasing contaminant loading with no clear defined trend for most of the analytes and parameters assessed. The Final Combined Discharge complies with all the contaminant levels required by the consent. There are some increasing and decreasing trends and the discharge complies with the ANZECC 2000 guidelines when allowance is made for the 100:1 dilution at the diffuser. The Time Trends analysis of the Final Combined Wastewater also showed no significant trends for most of the analytes and parameters assessed. There was also no evidence to suggest either an increasing or decreasing level of toxicity The receiving water shows no statistically significant differences between any site for any parameter indicating the receiving water is similar for each site including those sites close to the outfall and the river mouths. The box and whisker diagrams show some localised changes that could be attributable to the outfall or the rivers but they are not statistically significant The sediment analyses show some differences between sites. The box and whisker diagrams show an elevation of some levels to the south of the outfall. There are both increasing and decreasing trends for some of the parameters. Overall the sediments comply the ANZECC 2000 sediment quality guidelines. A minor non-compliance has been highlighted against Condition 17. This was only because the drogue was not able to collect data for the 4 th Quarter. Given the data that is collected by the drogue, the failure to collect data in the 4 th Quarter has no bearing on the environmental effects. The report concludes that overall the current treatment and discharge through the long offshore ocean outfall is not only compliant with resources consent conditions but also provides for an environmentally and culturally acceptable, sustainable and economic solution for wastewater treatment from the Hastings District Council. 1

5 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Table of Contents CONTENTS Executive Summary... 1 Table of Contents... 2 Introduction Background Reasons for this Annual Report Structure of the Report Abbreviations... 6 Consent Conditions Relevant to the Annual Report Conditions to be Addressed by the Annual Report... 8 Data Analysis Methodology and Interpretation Analytical Results Trend Analysis for Wastewaters Comparisons Between Sites Trend Analysis for Toxicity Testing Field Sampling and Laboratory Analysis... 9 Compliance Assessments Compliance with the Consent Condition 2 Maximum Discharge Rates Condition 4 Dilution Rate on Slack Water Condition 5 Screening and Filtering Requirements Condition 6 Discharge Wastewater Quality Standards Condition 7 Effects within 750 m of the Midpoint Condition 8 Total Oil and Grease Concentrations Condition 9 Diffuser Inspections Condition 10 Maintenance of the Plant and Structures Condition 11 Maintenance of Sampling Equipment Condition 12 Monitor and Recording of Flows and Volumes Condition 14 Influent & Effluent Constituents Condition 15 Toxicity Tests of the Final Combined Discharge Condition 16 Water Sampling and Analysis at the Diffuser Condition 17 Surface Currents Measurements Condition 19 Seabed Grab Sampling Near the Diffuser Condition 20 Laboratory Analyses Requirements Condition 24 Annual Reporting Condition 25 Requirement to Publicise the Annual Report Condition 26 Requirement for a Public Day

6 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to Condition 28 Reporting on Complaints Condition 30 Addressing Issues that May Cause Non-Compliance Condition 31 Reporting Requirements in the Event of Non-Compliances Summary of the Compliance Assessments Compliance Assessments for Parts of Condition Introduction Condition 24(a) Summary of All Monitoring Undertaken Condition 24(b) Analysis of Sampling Required by Condition Condition 24(c) Analysis of Monitoring Data and Environmental Effects Condition 24(d) Compliance with the Trigger Values Condition 24(e) Non-Compliance and Operational Issues Condition 24(g) Trend Analyses Condition 24(i) Proposed Changes to Consent Conditions Conclusions Appendix A Resource Consent Conditions Appendix B Analysis of Flows Condition Appendix C DNSI Daily Loading cbod 5 Condition Appendix D FCW Concentrations & Loading Rates Conditions 6 and 24(a) Appendix E Daily Volumes Condition Appendix F Additional Sampling Results for Final Combined Wastewater Condition 24(a) Appendix G Toxicity Analysis Results Condition Appendix H Adaptive Management Decision Tree Condition Appendix I Receiving Water Quality Results Condition Appendix J Seabed Grab Sampling Results Condition Appendix K Report Peer Review Report Condition Appendix L Treated BTF Trend Analysis Data Condition 24(g) Appendix M Final Combined Wastewater Loading Rates Trend Analysis Data Condition 24(g)70 Appendix N Comparison Between the Receiving Water Sampling Sites Appendix O Trend Analysis for Toxicants

7 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 LIST OF TABLES Table 1 - Summary of the Key Conditions to be Monitored/Reported On... 8 Table 2 Summary of Daily Flow Statistics from 1 July 2017 to 30 June Table 3 Maximum Concentrations and Loading Rates of the Contaminants in Condition Table 4 Total Oil and Grease Concentrations Table 5 Annual DNSI Influent and Effluent Average Concentrations Table 6 Toxicity Sampling Results and Compliance Table 7 Drogue Monitoring Table 8 - Summary of the Compliance Assessment of the Consent Conditions Table 9 BTF Plant Performance - DNSI (% Reduction) Table 10 Summary of the Trend Analysis Statistics for the DNSI Sampling Table 11 Summary of the Trend Analyses Statistics for the Final Combined Wastewater Data Table 12 Summary of the Trend Analyses Statistics for Toxicants Table 13 Compliance with Trigger Values LIST OF FIGURES Figure 1 HDC Wastewater Treatment - Flow paths... 5 Figure 2 Water Quality Sampling Sites Figure 3 Extract of Seabed Sampling Results (refer to Appendix J for Details)

8 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Introduction 1.1 Background The wastewater from Hastings district is reticulated to the Hastings District Council s Wastewater Facility at East Clive (Figure 1) through a separated system of pipes which allow interchanging of flows for maintenance purposes. The flows are Domestic and Non-Separable Industry (DNSI) which is composed mainly of domestic wastewater and industrial wastewaters. The DNSI is treated through Biological Trickling Filters (BTF) to remove the cultural offensiveness of the waste; the industrial wastewaters are screened through a 1 mm slot The Industrial Wastewaters are mainly organic in nature and contain no culturally offensive components (human waste). The industrial wastewater is treated onsite by industry in accordance with Council s Water Services and Trade Waste Bylaw. It then passes through Council s industrial milli-screening process before combining with the treated DNSI flows. After treatment the two wastewater streams are combined and then discharged through the long ocean outfall (2.75 km) with a diffuser in the last 300 m. Figure 1 HDC Wastewater Treatment - Flow paths 1.2 Reasons for this Annual Report Hastings District Council (HDC) was issued with a Resource Consent (CD130214W) on June 25, 2014, for the discharge of final treated wastewater through the long ocean outfall into Hawke Bay. This consent expires on 31 May The previous Consent CD990260Wd expired on the 31 March Condition 24 of Consent CD130214W (Appendix A) states that: 5

9 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Before 1 October each year, the Consent Holder shall provide the Regional Council (Manager Resource Use) with an Annual Monitoring Report, covering the preceding 12 months period ending 30 June. The report shall be submitted together with a peer review completed by a suitably qualified and experienced professional expert. The monitoring report shall include but not limited to: a. A summary of all monitoring undertaken as required by this consent, and may include details of additional monitoring undertaken by the consent holder to better characterize the effects of the discharge on Hawke Bay; b. A critical analysis of the results of sampling required by Condition 13, in the Annual Monitoring Report completed the year following the collection of that data. c. A critical analysis of the monitoring information in terms of compliance and adverse environmental effects; d. An assessment of compliance in relation to the trigger values set out in the table below. e. Comment on any non-compliances and operational problems, and any actions undertaken to address these; f. Details of any works undertaken or proposed to improve the performance of the treatment system, and the timeframe for completion of any proposed works; g. Identification and comment on any trends in volumes, flows, toxicity (EC50 or LC50) and contaminant loads over the reporting period and compared to previous years. This shall include any trends in water quality parameters/wastewater constituents including comment on the potential environmental implications of these trends; and h. Recommendations regarding alterations or additions to the monitoring programme; i. Details of any changes to the consent conditions that may be applied for within the next 12-month period; j. Details of the date of the plant open day, numbers in attendance, and written questions submitted by members of the public, and responses given (except that this subsection cannot be addressed in the first Annual Monitoring Report completed in accordance with the conditions of this consent); and k. The tabulated results of the laboratory analytical monitoring. The purpose of this report is to assess compliance with Consent CD130214W in compliance with Condition 24 of the consent. 1.3 Structure of the Report This report comprises the following sections: Section 1: Section 2: Section 3: Section 4: Which is this section, provides some background on the treatment system, and the reporting requirements. Identifies the consent conditions that need to be reported on in this annual report. Summarises the data analysis methodology and interpretation. Provides the compliance data required in the consent and determines whether the relevant conditions in Section 2 are complied with or not. Section 4: Provide a more detailed analysis of the compliance with Condition 24. Section 5: Conclusions. 1.4 Abbreviations AEE Assessment of Environmental Effect ANZECC Australia and New Zealand Environment and Conservation Council AS Acid Soluble Avg Average (or Mean) 6

10 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 BTEX Benzene, Toluene, Ethylbenzene and Xylene BTF Biological Trickling Filter BOD 5 day Carbonaceous Biochemical Oxygen Demand cbod5 5 day Carbonaceous Biochemical Oxygen Demand Cfu Colony forming units (of microorganisms) COD Chemical Oxygen Demand DNSI Domestic and Non Separable Industry (This is the wastewater to be treated by the BTF) DRP Dissolved Reactive Phosphorous FCW Final Combined Wastewater HBRC Hawkes Bay Regional Council HDC Hastings District Council ISQG Interim Sediment Quality Guideline g/m 3 grams per cubic meter (same as mg/l) L/s litres per second LOEC Lowest Observable Effect Concentration m meter m 3 cubic meters mg/l milligrams per litre (same as g/m 3 ) MOU Memorandum of Understanding NH3 Ammonia NH3N or NH4N Ammoniacal Nitrogen NH4 + Ammonium Ion NOEC No observed Effect Concentration NT Not Tested The sample was not tested for that particular parameter PLC Programmable Logic Controller SCADA Supervisory Control and Data Acquisition TEC Threshold Effect Concentration (Geometric mean of NOEC and LOEC) TN Total Nitrogen TOG Total Oil and Grease TP Total Phosphorous TSS (and SS) Total Suspended Solids 7

11 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Consent Conditions Relevant to the Annual Report 2.1 Conditions to be Addressed by the Annual Report Consent CD130214W has 32 conditions (Appendix A). Not all the 32 conditions require on-going annual monitoring and reporting and the ones that do are summarised in Table 1. Table 1 - Summary of the Key Conditions to be Monitored/Reported On Condition Summary of the Condition 2 Stipulates the maximum wastewater discharge rates. 4 States the requirement for a diffuser and the minimum dilution rate. 5 Specifies the screening and filtering requirements for the industrial and domestic wastewater. 6 Defines the combined wastewater discharged quality standards for metals and ammonia. 7 Specifies the adverse odour, visual, chemical, biological and ecological effects to be avoided as a result of the discharges. 8 Provides the Total Oil and Grease limits in the final combined wastewater over a 24-hour period. 9 The inspection requirements for the diffuser and reporting of the frequency of blockages. 10 Requirement to maintain the diffuser on the long offshore outfall. 11 Requirements to ensure that all sampling equipment, including meters and field measurement devices are maintained and operated based on best practices. 12 Specifies the flow measurement requirements Defines the sampling requirements for domestic and industrial wastewater and the contaminants to be sampled. Defines the sampling requirements for testing for toxicity of the final combined wastewater to some marine organisms. 16 Sampling requirements for the diffuser. 17 GPS Drogue surface currents measurements. 19 Requirements for seabed sampling. 20 Requirements for the laboratory doing the analyses. 24 Requirements for an Annual Monitoring Report. 25 Requirement to publicise the annual report. 26 Requirement for a Public Open Day. 28 Defines the recording of complaints Outlines the Consent Holder responsibilities in the event of non-compliances or possible noncompliances. Outlines the process for reporting non-compliances and providing further information on how and why the non-compliance occurred and contingent measures to address or minimise the non-compliances. The conditions not included in Table 1 do not require on-going monitoring or they were complied with through the design process and/or construction stages. For some of them (e.g. Condition 27) monitoring and reporting will be required in future years. 8

12 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Data Analysis Methodology and Interpretation 3.1 Analytical Results Where an analytical result is below the detection level, half of the detection level has been used in calculating averages, maximums and minimums. If all the results are below the detection level the results are shown as less than the detection level as there is no indication as to how close the results are to the detection level. For microbiological analyses if the analysis shows <1 then 1 has been used for numerical analysis. 3.2 Trend Analysis for Wastewaters The Mann-Kendall test and the Sen Slope estimator have been used to evaluate trends. The NIWA Statistical program Time Trends was used for the data analysis. The analysis used 4 seasons which aligned with the quarterly analyses, July to September, October to December, January to March, April to June. All the data collected from the start of the consent (1 July 2014) was used in the trend analysis. The 2016/17 report opted for a simple method to report the trends and significance by reporting the percentage estimated annual change with probability using the following categories: Probability <0.9 Probability 0.9 to 0.95 Probability 0.95 to 0.99 Probability 0.99 to Probability >0.999 Not Significant Weak Significant Strong Very Strong For this 2017/18 Annual Report, if a trend was found to be present, the trend strength was then determined using the Theil Sen slope estimator. The significance level, p (probability) value, was set at alpha = 0.05 so all results from the Mann-Kendall trend analysis were considered statistically relevant if their associated twosided p value was The analysis was carried out at the 95% Confidence Interval. To compare direction and significance of trends, trend slopes and p-values of real and estimated trends in a time series segment were classified in six trend classes: - N3: significant decreasing trend (slope < 0 and p 0.05) - N2: non-significant decreasing trend (slope < 0 and 0.05 < p 0.1) - N1: no trend with decreasing tendency (slope < 0 and p > 0.1) - P1: no trend with increasing tendency (slope > 0 and p > 0.1) - P2: non-significant increasing trend (slope > 0 and 0.05 < p 0.1) - P3: significant increasing trend (slope > 0 and p 0.05). 3.3 Comparisons Between Sites The trend for each site and parameter has been analysed using Time Trends as described Section 2.3 of this report. Box and whisker diagrams for the total data for the current consent provide a visual comparison between the sites. 3.4 Trend Analysis for Toxicity Testing The Threshold Effect Concentration has been used to assess trends using Time Trends as described in section Field Sampling and Laboratory Analysis Field measurements were undertaken in accordance with best industry practice. 9

13 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 All quality analysis of the wastewater discharged other than field measurements as required by the conditions of this consent were undertaken by an independent laboratory (Hills Laboratory and NIWA) accredited to IANZ or other laboratory approved by the Regional Council. 10

14 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Compliance Assessments 4.1 Compliance with the Consent Compliance Assessment This section assesses and discusses compliance with the conditions of consent CD130214W. As noted in Section 2.1, not all of the 32 conditions on Consent CD130214W require on-going monitoring, assessment and annual reporting. The conditions required to be reported on as part of the annual report are listed in Table 1. After assessment of the relevant conditions, compliance with the conditions is graded as Compliant, Minor Non- compliance or Non-compliant Assessment of Environmental Effects As part of the assessment, where necessary an assessment of environmental effects has also been provided in the following sections. In general, whenever, the consent condition was complied with, the conclusion is that the environmental effects would be no more than minor since the consent conditions and limits where set to ensure that the effects on the environment was no more than minor. 4.2 Condition 2 Maximum Discharge Rates Condition 2 states that The rate of discharge of the final combined wastewater shall not exceed 2,800 litres per second Compliance Assessment Two pumps at full speed have a maximum design flow of 2,800 L/s. Therefore, the pumps would never pump at a higher rate that the maximum capacity of the pumps. Table 2 provides a summary of the key daily statistics for the period under review. A more detailed analysis of the final combined flows from 1 July 2017 to 30 June 2018 is provided in Appendix B. The table below and Appendix B show that maximum peak flow recorded was 2,397 L/s. This flow rate was recorded on 26 July Table 2 Summary of Daily Flow Statistics from 1 July 2017 to 30 June 2018 Month Daily Average Flows (L/s) Daily Maximum Flows (L/s) Daily Minimum Flows (L/s) Jul- 17 Aug- 17 Sep- 17 Oct- 17 Nov- 17 Dec- 17 Jan- 18 Feb- 18 Mar- 18 Apr- 18 May ,397 1, ,897 1,193 1,122 1,194 1,927 1, , Therefore, Condition 2 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant Jun Condition 4 Dilution Rate on Slack Water Condition 4 states that The final combined wastewater discharged to Hawke Bay via the long offshore outfall shall pass through an ocean outfall diffuser which has been designed to achieve a minimum average dilution over the boil of not less than 100:1 on slack water. 11

15 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to Compliance Assessment The diffuser was designed to meet these criteria. Therefore, Condition 4 was complied with at the design and construction phase of the project. Grading Compliant Minor Non-Compliant Non-Compliant Assessment of Environment Effects ANZECC 2000 has been used to provide an assessment of environmental effects. As the minimum dilution required by this consent is 100:1, the effect on the environment by the final combined wastewater has been assessed by comparing the parameters in the final combined wastewater with the ANZECC 2000 guidelines for toxicants for a typical slightly-moderately disturbed system. This provides an environment effect at the boil directly above the diffuser. Dilutions further away from the diffuser are significantly greater. A more detailed assessment of environmental effects is provided in Section Condition 5 Screening and Filtering Requirements Condition 5 states that The final combined wastewater discharged shall meet the following requirements: a) All separable industrial wastewater shall pass through a milliscreen having a maximum aperture slot width of 1mm. b) All domestic and non-separable industrial wastewater shall pass through a 3mm diameter hole size screening device or equivalent, followed by treatment in a biological trickling filter, with an annual average daily loading of carbonaceous biochemical oxygen demand (5 day test) (cbod 5) that shall not exceed 0.4 kg per cubic metre of media, with the treatment plant managed in accordance with best wastewater engineering practice and industry standards, and: i) the media in the biological trickling filters shall consist of randomly packed plastic material that provides a specific surface area of not less than 90 m 2 /m 3 and ii) the wastewater remaining after that treatment, prior to being discharged, shall pass through the Rakahore channel Compliance Assessment Conditions 5(a), 5(b)(i) and 5(b)(ii) were all complied with at the design and construction phases as: a) A 1 mm ContraShear Suboscreen was installed for screening all separable industrial wastewater. b) A 3 mm Escamax Screen was installed for screening all domestic and non-separable industrial wastewater. c) The media in the BTF has a specified surface area of 100m 2 /m 3. d) All treated wastewater passes through the Rakahore channel. Part of Condition 5(b) specifies an annual average daily loading of the cbod 5 of 0.4 kg per m 3 of media. The collected data has been analysed and this is presented in Appendix C. The data shows that the: - Annual average daily cbod5 loading rate = 0.23 Kg/m 3. - The maximum daily cbod5 loading rate = Kg/m 3. Condition 5 was complied with during the 1 July 2017 to 30 June 2018 reporting period. Grading Compliant Minor Non-Compliant Non-Compliant 12

16 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to Condition 6 Discharge Wastewater Quality Standards Condition 6 states that The final combined wastewater discharged shall meet the following standards: Analyte Maximum Concentration (g/m 3 ) Maximum Loading (Kg/day)* Chromium III Chromium VI Copper Zinc Cadmium Mercury Lead Nickel Ammonia 91 4,738 * The maximum daily loading limit is based on the maximum treated wastewater concentration limits multiplied by the 75%ile wastewater flow rate (52,070 m 3 /day) over 12 months in 1998 (a dry year). In the event that a limit is exceeded for any analyte, an additional 24-hour flow proportional sample shall be collected and tested for that analyte within 5 working days of receipt of the laboratory result. An investigation shall also be undertaken into the cause of the exceedance, and the findings of the investigation recorded and provided to the Regional Council (Manager Resource Use) within one month of the exceedance occurring Compliance Assessment The Hills Laboratory sampling results were input into spreadsheet and analysed for the maximum concentrations of the various constituents in Condition 6. The data was also used to calculate the loading rates of the various contaminants. Table 3 provides maximum concentrations (g/m 3 ) and the maximum loading rates (Kg/day) for the contaminants. Appendix D provides details of the analysis carried out to produce the summary results in Table 3. Table 3 Maximum Concentrations and Loading Rates of the Contaminants in Condition 6 Analyte Maximum Concentration (g/m 3 ) Maximum Loading (Kg/day) Chromium III Complies Complies Chromium VI Complies Complies Copper Complies Complies Zinc Complies Complies Cadmium Complies Complies Mercury Complies Complies Lead Complies Complies Nickel Complies Complies Total Ammonia N Complies Complies Condition 6 was complied with during the 1 July 2017 to 30 June 2018 reporting period. Grading Compliant Minor Non-Compliant Non-Compliant 4.6 Condition 7 Effects within 750 m of the Midpoint Condition 7 states that The discharge of the final combined wastewater as authorised by this Resource Consent shall not cause any of the following effects beyond a distance of 750m from the midpoint of the outfall diffuser: a) The production of any conspicuous suspended materials; or b) Any conspicuous change in the colour or visual clarity; and shall not cause any of the following effects beyond a distance of 500m from the midpoint of the outfall diffuser: c) The production of any conspicuous o i l or grease films, scums or foams, or floatable materials; or d) d) Any emission of objectionable odour; or e) Any significant adverse effects on aquatic life, or 13

17 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 f) A change of the natural temperature of the receiving w a t e r by more than 3 degrees Celsius, or g) The Dissolved Oxygen concentration to be less than 80% of the saturation concentration, or h) Undesirable biological growths Compliance Assessment Each time sampling is carried out around the outfall diffuser (each quarter) visual and olfactory observations are made and recorded at 750m and 500m to the North and South of the diffuser as well as directly over the diffuser. No abnormalities in the colour, clarity, grease films, scums and floatable material or undesirable biological growths were reported in the period under review. Condition 7 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.7 Condition 8 Total Oil and Grease Concentrations Condition 8 states that The average concentration of Total Oil and Grease in the final combined wastewater shall not exceed 200g/m 3 over any 24 hour period based on the sampling procedure set out in Conditions 13 and Compliance Assessment The Total Oil and Grease concentration statistics are summarised in Table 4. The average concentration over the sampling period was 96 g/m 3 and the maximum concentration was 186 g/m 3. Table 4 Total Oil and Grease Concentrations Statistic Total Oil and Grease (g/m 3 ) Average 96 Minimum 13 Maximum 186 The analysis of the Hills Laboratory results for oil and grease concentrations is also presented in Appendix D. Condition 8 was complied with during the 1 July 2017 to 30 June 2018 reporting period. Grading Compliant Minor Non-Compliant Non-Compliant 4.8 Condition 9 Diffuser Inspections Condition 9 states that The Consent Holder shall inspect the diffuser at least annually and at intervals not more than14 months apart, and at any other time as necessary, at which time any ports blocked by mussels or other debris will be cleared. The number of blocked ports shall be recorded and reported in the Annual Monitoring Report required by Condition 24 of this consent Compliance Assessment The inspection was carried out on 24 July The diffuser was in similar condition to the last inspection. Condition 9 was complied with during the period under review. 14

18 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Grading Compliant Minor Non-Compliant Non-Compliant 4.9 Condition 10 Maintenance of the Plant and Structures Condition 10 states that The Consent Holder shall ensure that all components of the wastewater treatment plant and outfall structures (including the diffuser on the long offshore outfall) are maintained in good working order, and in accordance with industry best practice guidelines Compliance Assessment Routine preventative maintenance of the plant and equipment is undertaken on a regular basis and records logged into Council s asset data systems (IPS and Infrastructure Data). Reactive maintenance is undertaken in response to unplanned events. The plant is operated by 3 FTEs and specialised electrical and mechanical expertise is provided by contractors. There has been a minor problem with rags bypassing the domestic screens. This has the potential to overload the BTF distributor arms, requiring more regular cleans. To mitigate this issue a new centre flow screen has been purchased and a trial will be conducted to determine the effect on this problem. The control network at the plant is in a redundancy cycle and a project to replace and upgrade the plant wide control system is currently underway. There has been a significant focus on health and safety improvements with a number of assessments having been undertaken including Hazardous substances assessment and certification including Staff training and spill response drills. H&S signage has also been reviewed and improvements made. Condition 10 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.10 Condition 11 Maintenance of Sampling Equipment Condition 11 states that The Consent Holder shall ensure that all sampling equipment, including meters and field measurement devices are maintained in good working order by suitably qualified persons in accordance with the manufacturer's instructions and industry best practice guidelines. Records of calibration shall be kept and made available to the Council (Manager Resource Use) upon request Compliance Assessment All equipment is calibrated to recognised standards and is kept in good working order by qualified technical staff. Therefore, Condition 11 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.11 Condition 12 Monitor and Recording of Flows and Volumes Condition 12 states that The Consent Holder shall continuously monitor and record the rate of discharge and the daily volume of the final combined wastewater is charged. The flow meters used to record the discharge shall have an accuracy within plus or minus 5%, as per the manufacturer s calibration records 15

19 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to Compliance Assessment The rate of discharge data is summarised in Table 2 and the full dataset is presented in Appendix B. The daily volumes are presented in Appendix E. The flow meters used for recording the discharge are maintained as per the manufacturers guidelines as highlighted in Section Therefore, Condition 12 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.12 Condition 14 Influent & Effluent Constituents Condition 14 states that Starting 12 months from the date of commencement of this consent, at quarterly intervals, with not less than 2 months between each sample, the Consent Holder shall take 24- hour flow proportional samples on a minimum of 7 consecutive days of the following w aste streams, and analyse them for the constituents stated: (a) The domestic and non-separable industrial wastewater prior to the biological trickling filter treatment. These samples shall be analysed for: i) Total suspended solids; ii) Total oil and grease; and iii) cbods. (b) The domestic and non-separable industrial wastewater immediately after the biological trickling filter treatment. These samples shall be analysed for: i) Total suspended solids; ii) Total oil and grease; and iii) cbod 5. c) The final combined wastewater. These samples shall be analysed for the analytes listed, at the detection limit shown, in Schedule 1 (attached) for quarterly and annual sampling Compliance Assessment Conditions 14(a) and 14(b) The DNSI flows and sampling results have been analysed for assessment of compliance with part of Condition 5(b). The detailed results of the analysis are presented in Appendix C and Table 5 provides a summary of the annual averages of the constituents required to be assessed in compliance with Conditions 14(a) and 14(b). Table 5 Annual DNSI Influent and Effluent Average Concentrations Constituent Influent Effluent Total Suspended Solids (g/m 3 ) Total Oil and Grease (g/m 3 ) cbod5 (g/m 3 ) Compliance Assessment Conditions 14(c) Condition 14(c) requires that the final combined wastewater samples be analysed for the analytes in Schedule 1. This condition has been complied with as the final combined wastewater samples have been analysed at the detection limits shown in Schedule 1. The quarterly and annual sampling results can be found in Appendix D and Appendix F where all the quarterly and annual sampling data is presented. Therefore, Condition 14 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 16

20 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to Condition 15 Toxicity Tests of the Final Combined Discharge Condition 15 states that At quarterly intervals, with not less than 2 months between each sample, the Consent Holder shall test the toxicity of the final combined wastewater to at least three species of marine organisms to determine if there is a statistically significant effect. A plan outlining the proposed testing method and the organisms to be tested shall be submitted to the Regional Council (Manager Science) for approval within 2 months of the commencement date of this consent. Changes to the plan (including changes to the organisms tested) can be made but must be submitted to the Regional Council for approval before the proposed changes can be made. The interpretation of results and the actions shall be undertaken using an adaptive management approach as is detailed in the figure on Page 5 of the Consent Compliance Assessment Toxicity analyses were carried out once every quarter using 7-Day Final Combined Wastewater samples in compliance with Condition 15. The samples are submitted to NIWA for the analyses. For the period under review the toxicity samples were taken from: 8am 4 th to 8am 5 th September am 27 th to 8am 28 th November am 5 th to 8am 6 th March am 16 th to 8am 17 th July Each sample was tested against the following: Marine algae (Minutocellus polymorphus 48 hour growth test) Wedge shell (Macomona Liliana-96 hour survival and burial test) Blue mussel embryo test (Mytilus galloprovincialis 48 hour embryo development test) Condition 15 states that there shall be no statistically detectable difference in toxicity between a water sample taken from uncontaminated near shore water (from a location to be approved by Hawke s Bay Regional Council) a, and treated wastewater when diluted 200-times with that water. No toxicity is defined as a notoxicity dilution a less than 200-fold. Table 6 provides the toxicity sampling results. The results are reported as the No-toxicity dilution which is calculated as (1/TEC*100). The results are then assessed using the adaptive management approach as required under Condition 15 of the consent. Table 6 Toxicity Sampling Results and Compliance Date Algae Wedge Shell 96 hr Acute Survival Wedge Shell Morbidity (60 minutes Reburial) Blue Mussel Embryo Compliance 4-5/9/ <5 <5 283 Not compliant for Blue Mussel 27-28/11/ <5 141 Compliant 5-6/3/ Not compliant for Blue Mussel 16-17/7/ <5 <5 141 Compliant NR 1 = No result, the test did not meet the acceptability criteria Table 6 shows that: - The algae, blue mussel and wedge shell tests did not show significant toxicity at a 200-fold dilution for the effluent samples taken on 27-28/11/2017 and 16-17/07/2018. Therefore, the samples complied with the no-toxicity compliance criteria. - The algae and wedge shell tests did not show significant toxicity at a 200-fold dilution for the effluent samples taken on 4-5/9/2017 and 16-17/7/2018. Therefore, the samples complied with the notoxicity compliance criteria for algae and wedge shell. - The blue mussel samples for 4-5/9/2017 and 16-17/7/2018 exceeded the 200-fold dilution and showed significant toxicity at 200-fold dilution. Therefore, the samples did not comply with the no-toxicity compliance criteria for blue mussel. 17

21 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 The toxicity statistical analysis is presented in Appendix G and the trend analysis is provided in Appendix O Interpretation of the Results Using the Adaptive Management Approach The Adaptive Management Plan provides a decision tree to assist in deciding the risk to the environment based on various criteria. A copy of the decision tree is presented in Appendix H. There were two results in excess of 1 in 200 as shown in Table 6. Based on the decision tree in Appendix H no further action was required on any sample Condition 16 Water Sampling and Analysis at the Diffuser Condition 16 states that At quarterly intervals, with not less than 2 months between each sample, the Consent Holder shall take water quality samples at 10 sites perpendicular to the centre of the diffuser at distances of 100m, 250m, 500m, 750m and 1000m (on each side of the diffuser). These samples will be analysed for faecal coliform and enterococci. Field measurements are to be made of ph, salinity, turbidity, temperature, and dissolved oxygen (%saturation) at each location as well Compliance Assessment Measurements were taken around the outfall using a multiparameter (YSI ProDSS) probe for ph, temperature, Dissolved Oxygen, Salinity, and Turbidity at the locations prescribed in Condition 16. In addition to these locations, measurements were also taken 2,000m either side of the outfall. Samples were also taken in front of the river mouths, approximately 50m offshore. Figure 2 below shows the locations of the sampling points. Figure 2 Water Quality Sampling Sites 18

22 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 In addition to the field measurements, receiving water quality samples were collected for laboratory analysis. The samples were collected approximately 150 mm below the water surface using 2 x 1 L containers on: - 13 September November February June The 2 x 1 L sample containers were used to fill smaller sample bottles which were preserved and refrigerated and sent to Hill Laboratories for analysis of Faecal Coliforms, Enterococci, Suspended Solids, Ammoniacal Nitrogen, Nitrate+Nitrite Nitrogen, Total Nitrogen, Dissolved Reactive Phosphorous and Total Phosphorous. The full sampling results dataset is provided in Appendix I. Therefore, Condition 16 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.15 Condition 17 Surface Currents Measurements Condition 17 states that While samples are being taken in accordance with Condition 16, a GPS drogue shall be placed at the centre of the diffuser to measure the surface currents for at least 30 minutes Compliance Assessment A drogue was deployed during sample. The location of the drogue was tracked every 1 minute using a GPS unit with drogue every 1 minute. The route of the drogue is shown in Figure 2Error! Reference source not found.. Table 7 shows the drogue monitoring data. There is no drogue data for the 4 th Quarter as the equipment malfunctioned during the sampling. This resulted in a minor non compliance. Given the type of location data collected by the drogue, the failure to collect this data in the 4 th Quarter has no bearing on the environmental effects. Table 7 Drogue Monitoring 13/09/ /11/ /02/ /6/2018 Start Time 9:25:32 10:54:20 9:02:02 N/A End Tim 10:50:32 11:54:20 10:02:02 N/A Length of monitoring (min) N/A Distance travelled (m) N/A Direction of Travel (Degrees True) N/A Speed m/s N/A N/A Not Available Condition 17 has been assessed Minor Non-Compliant because of the lack of data for the 4 th Quarter Grading Compliant Minor Non-Compliant Non-Compliant 4.16 Condition 19 Seabed Grab Sampling Near the Diffuser Condition 19 states that Twice during the year (summer and winter) the Consent Holder shall take seabed sediment grab samples at distances of approximately 250m, 500m and 750m to the north and 19

23 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to m, 500m and 750m to the south of the midpoint of the outfall diffuser. Those samples shall be analysed for the analytes listed, at the detection limit shown, in Schedule 2. In the event that sediment monitoring required by this condition, results in two or more exceedances of ANZECC 2000 (ISQG - Low) sediment guidelines on one occasion of sampling, then an additional benthic survey shall be undertaken within one year of the sediment sampling exceedance(s) occurring. However, no more than one additional survey shall be required by this condition to be undertaken within each 9 year period specified in Condition 18 a) Compliance Assessment The consent requires samples of the sediment to be taken twice per year. HDC takes samples each time it visits the outfall for receiving water monitoring. For the period under review the monitoring dates and the sampling points are described in Section The approximate locations of the sampling points are shown in Figure 2. The samples were taken using a mini ponar dredge and placed in a container in a chilly bin. Each sample was subsampled and sent Hill Laboratories for the following analytes: - Total Arsenic - Total Cadmium - Total Chromium - Total Copper - Total Nickel - Total Mercury - Total Zinc - Total Tin - Volatile Solids (not required by the consent). This provides an indication of organic matter around the outfall - Particle Size (>2mm, 63microns to 2mm and <63 microns). Many of the metals can be incorporated with the mud (<63 microns) fraction so it allows a comparison with mud levels. The sampling results are presented in Appendix J. Figure 3 below is an extract of Appendix I. All the average concentrations were within the ISGC limits. Only one sample (250 m North) taken on 13 September 2017 had a maximum concentration of mercury level of 0.2 mg/kg which was greater than the ISQG limit of 0.15 mg/kg. However, subsequent sampling (on 24 November 2017 and 28 February 2018) at the same location returned mercury levels of 0.07 mg/kg and 0.06 mg/kg respectively. 20

24 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Figure 3 Extract of Seabed Sampling Results (refer to Appendix J for Details) Condition 19 states that In the event that sediment monitoring required by this condition, results in two or more exceedances of ANZECC 2000 (ISQG - Low) sediment guidelines on one occasion of sampling, then an additional benthic survey shall be undertaken within one year of the sediment sampling exceedance(s) occurring Therefore, Condition 19 was complied with during the period under review as the sampling data required by the condition was collected. Only one sample initially exceeded the ISQG limit. However, subsequent sampling demonstrated compliance with the condition. 21

25 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Grading Compliant Minor Non-Compliant Non-Compliant 4.17 Condition 20 Laboratory Analyses Requirements Condition 20 states that All quality analysis of the wastewater discharged other than field measurements as required by the conditions of this consent shall be undertaken by an independent laboratory accredited to IANZ or other laboratory approved by the Regional Council (Manager Resource Use). Field measurements shall be undertaken in accordance with best industry practice Compliance Assessment Analyses carried out by Hill Laboratories (IANZ accredited) and NIWA Toxicology Laboratory. Therefore, Condition 20 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.18 Condition 24 Annual Reporting Condition 24 states that Before 1 October each year, the Consent Holder shall provide the Regional Council (manager Resource Use) with an Annual Monitoring Report, covering the preceding 12 months period ending 30 June. The report shall be submitted together with a peer review completed by a suitably qualified and experienced professional expert. The monitoring report shall include but not limited to - the sub-conditions (a)-(k) discussed below Compliance Assessment Condition 24 requires that Before 1 October each year, the Consent Holder shall provide the Regional Council (manager Resource Use) with an Annual Monitoring Report, covering the preceding 12 months period ending 30 June. The report shall be submitted together with a peer review completed by a suitably qualified and experienced professional expert. This report has been prepared in compliance with Consent Condition 24. A copy of the Peer Review report is also attached as Appendix K. Compliance with the individual sub-conditions of Condition 24 is discussed in the preceding sections and for some of them in more detail in Section Condition 24(a) - Compliance Assessment Condition 24(a) requires that the monitoring report provides A summary of all monitoring undertaken as required by this consent, and may include details of additional monitoring undertaken by the consent holder to better characterize the effects of the discharge on Hawke Bay Refer to Sections , and Section 5 for detailed discussions on compliance with the various consent conditions. For completeness and to provide the additional information required to demonstrate full compliance with Conditions 24(a), more detailed analyses of the monitoring results is provided in Section 5. Section 5 provides detailed analyses and discussion on other data collected as part of the monitoring for this consent. Therefore, Condition 24(a) was complied with during the period under review. 22

26 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Grading Compliant Minor Non-Compliant Non-Compliant Condition 24(b) - Compliance Assessment Condition 24(b) requires that the monitoring report provides A critical analysis of the results of sampling required by Condition 13, in the Annual Monitoring Report completed the year following the collection of that data Condition 13 is no longer relevant to the consent and, therefore, a critical assessment of the sampling results required by Condition 14 has been carried out. Details of the analysis can be found in: - Section and for a discussion compliance with Condition 14 (a), (b) and (c). - Section 5 for a more detailed critical analysis of the data and conclusions drawn from the analysis. Therefore, Condition 24(b) was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant Condition 24(c) - Compliance Assessment Condition 24(c) requires that the monitoring report provides A critical analysis of the monitoring information in terms of compliance and adverse environmental effects In compliance with Condition 24(c): - Information on compliance with the various consent conditions and analyte limits can be found in Section and for a discussion compliance with the various consent conditions. - Information on analysis of potential adverse environmental effects can be found in Section 5.4. Therefore, Condition 24(c) was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant Condition 24(d) - Compliance Assessment Condition 24(a) requires that the monitoring report provides An assessment of compliance in relation to the trigger values set out in the table below. Any exceedances of these trigger values shall be clearly identified and reasons for each exceedance (if known) provided. Comment shall also be provided about the significance of the exceedance in terms of effects (if any) on the receiving environment, and any measures that may be appropriate to reduce the concentration of the relevant analyte should that be necessary having regard to any adverse environmental effects. An assessment of trends in the concentrations of these parameters over the previous year, and also over the term of this Resource Consent must also be provided; Analyte Trigger Value 2 cbod5 1 48,000 Kg/day Total Suspended Solids 1 39,000 Kg/day Total Daily (annual average) volume 66,000 m 3 /day 1 The annual average mass load is calculated by multiplying the result for each day by the volume each day and then averaging the loads. 2 The trigger value is calculated as an upper tolerance limit based on annual mean results from 1998 to 2013 inclusive. A detailed assessment with Condition 24(d) is presented in Section

27 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to Condition 24(e) - Compliance Assessment Condition 24(e) requires that the monitoring report provides Comment on any non-compliances and operational problems, and any actions undertaken to address these A detailed assessment with Condition 24(e) is presented in Section Condition 24(f) - Compliance Assessment Condition 24(f) requires that the monitoring report provides Details of any works undertaken or proposed to improve the performance of the treatment system, and the timeframe for completion of any proposed works There were no works that were undertaken during the period under review Condition 24(g) - Compliance Assessment Condition 24(g) requires that the monitoring report provides Identification and comment on any trends in volumes, flows, toxicity (EC50 or LC50) and contaminant loads over the reporting period, and compared to previous years. This shall include any trends in water quality parameters/wastewater constituents including comment on the potential environmental implications of these trends A detailed assessment with Condition 24(g) is presented in Section Condition 24(h) - Compliance Assessment Condition 24(h) requires that the monitoring report provides Recommendations regarding alterations or additions to the monitoring programme The current monitoring provides a good level on information on the wastewater, the receiving environment and the sediments. There are no planned changes or additions to the monitoring programme Condition 24(i) - Compliance Assessment Condition 24(i) requires that the monitoring report provides Details of any changes to the consent conditions that may be applied for within the next 12 month period The planned changes to the consent conditions within the next 12 months are discussed in detail in Section Condition 24(j) - Compliance Assessment Condition 24(j) requires that the monitoring report provides Details of the date of the plant open day, numbers in attendance, and written questions submitted by members of the public, and responses given (except that this subsection cannot be addressed in the first Annual Monitoring Report completed in accordance with the conditions of this consent) An Open Day was carried out on 26 November The details regarding the Open Day are provided in Section 4.20 below. Therefore, Condition 24(j) was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 24

28 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to Condition 24(k) - Compliance Assessment Condition 24(c) requires that the monitoring report provides The tabulated results of the laboratory analytical monitoring The results and the laboratory results have been tabulated throughout this report and in the accompanying appendices. The various tables have been clearly labelled and a discussion of the results has also been provided. Therefore, Condition 24(k) was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.19 Condition 25 Requirement to Publicise the Annual Report Condition 25 states that Each Annual Monitoring Report shall be made publicly available on the Consent Holder's website within one month of it being lodged with the Regional Council (Manager Resource Use). Notification of the availability of this Report shall also be included in the Consent Holder's next public newspaper general ratepayers' notice and also the next ratepayer newsletter Compliance Assessment The 2016/2017 Annual Report was not included in a ratepayer newsletter, but notification was placed on the Council website, in the newspaper and radio advertisements. Therefore, Condition 25 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant It is also Council s intention to place notification of the availability of the 2017/2018 Annual Report on the Council website, in the newspaper and radio advertisements Condition 26 Requirement for a Public Day Condition 26 states that During the month of November each year, the Consent Holder shall have a public 'open day' at the Wastewater Treatment Plant site, located on Richmond Road. Notification of this open day shall be done via the Consent Holder's website and in a Consent Holders public newspaper general ratepayers' notice at least 10 working days before the open day. The open day shall be attended by Hastings District Council Staff as well as a Regional Council Compliance Officer. The purpose of the open day is to give the community an opportunity to view the treatment plant and discuss the Annual Monitoring Report. It is also an opportunity for members of the public to submit written questions to which the Consent Holder shall respond in writing within one calendar month. Details of the date of the open day, numbers in attendance, written questions submitted and responses given shall be included in the next Annual Monitoring Report, as noted in Condition 24(j) above Compliance Assessment The Open Day was held on 27/11/ People attended and there were no official requests for further information. Comments made on the sign-in sheet were similar to the ones from the 2016/2017 period. The following is a summary of the general themes: 25

29 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to Very Educational. - Good system working well. - Very interesting & Informative. Therefore, Condition 26 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.21 Condition 28 Reporting on Complaints Condition 28 states that The Consent Holder shall log all complaints received relating to the discharge. The log shall include: a) The date and time of the complaint; b) The nature of the complaint; c) The name, telephone number, and address of the complainant; d) Weather and sea condition information (including an estimate of wind speed and direction, and description of sea condition); e) Details of key operating parameters at the time of the complaint; and f) Any remedial action taken to prevent further incidents. Complaints shall be reported to the Regional Council (Manager Resource Use) within 24 hours of receipt, and the log of complaints shall be made available to the Regional Council (Manager Resource Use) on request. Any complaints relating to potential adverse health effects associated with exposure to the wastewater discharge shall be notified to the Hawke's Bay District Health Board within 24 hours of receipt also Compliance Assessment There were no odour complaints in relation to this consent during the period under review. Furthermore, there has not been any odours issues at the edge of the 500m mixing zone around the long ocean outfall. However, on occasions odour has been detected above the boil. As soon as one moves away from the outfall the odour disappears. Therefore, Condition 28 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.22 Condition 30 Addressing Issues that May Cause Non-Compliance Condition 30 states that In the event of the Consent Holder becoming aware of: a) unusual or extreme circumstances (not being circumstances such as would provide a defence under sections B, Resource Management Act 1991) that may lead to one or more of the conditions of this Resource Consent being breached, or b) circumstances having occurred that have, or could, lead to on-compliance, immediate notification of such problems shall be made to the Regional Council (Manager Resource Use). This notification shall include, but not be limited to, provision of the following information as far as such information is known to the Consent Holder at that time: i. The extent of non-compliance if it has occurred, including the duration of non compliance, volume discharged during that period, and the nature and quality of the discharge; ii. The immediate a n d further planned meas ures being undertaken to minimise and mitigate any adverse effects of the non-compliance; 26

30 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 iii. iv. The Consent Holder s assessment of public health risk arising from the event including advice received from the Hawke's Bay District Health Board Chief Executive Officer and Medical Officer of Health; and Updating the Regional Council (Manager Resource Use) at not greater than 24 hourly intervals of the current situation until the problems are rectified and the Consent Holder is compliant with the Resource Consent conditions Compliance Assessment Other than the malfunction of the drogue during the 4 th Quarter sampling, there were no issues that caused non-compliances during the period under review. Therefore, Condition 30 was complied with during the period under review. Grading Compliant Minor Non-Compliant Non-Compliant 4.23 Condition 31 Reporting Requirements in the Event of Non- Compliances Condition 31 states that Within one calendar month of any unforeseen event that resulted in noncompliance with the conditions of this Resource Consent, the Consent Holder shall provide a further report to the Regional Council (Manager Resource Use). This report shall include, but not be limited to the provision of any further information on the reasons for the noncompliance and the measures investigated and put in place or to be put in place to avoid or at least minimise the possibility of any similar problems in the future that may cause noncompliance Compliance Assessment Other the malfunctioning of the drogue, there were no non-compliances during the period under review. Therefore, Condition 31 did not have to be implemented Summary of the Compliance Assessments The compliance with the consent is discussed in preceding sections. Compliance with the consent has been very good. Table 8 summarises the compliance or otherwise of the conditions that have been assessed above. Table 8 - Summary of the Compliance Assessment of the Consent Conditions Condition Summary of the Condition Compliance 2 Stipulates the maximum wastewater discharge rates. Compliant 4 States the requirement for a diffuser and the minimum dilution rate. Compliant Specifies the screening and filtering requirements for the industrial and domestic wastewater. Defines the combined wastewater discharged quality standards for metals and ammonia. Specifies the adverse odour, visual, chemical, biological and ecological effects to be avoided as a result of the discharges. Provides the Total Oil and Grease limits in the final combined wastewater over a 24-hour period. The inspection requirements for the diffuser and reporting of the frequency of blockages. Compliant Compliant Compliant Compliant Compliant 10 Requirement to maintain the diffuser on the long offshore outfall. Compliant 27

31 WASTEWATER DISCHARGE CONSENT ANNUAL COMPLIANCE REPORT 2017 to 2018 Condition Summary of the Condition Compliance 11 Requirements to ensure that all sampling equipment, including meters and field measurement devices are maintained and operated based on best practices. Compliant 12 Specifies the flow measurement requirements. Compliant Defines the sampling requirements for domestic and industrial wastewater and the contaminants to be sampled. Defines the sampling requirements for testing for toxicity of the final combined wastewater to some marine organisms. Compliant Compliant 16 Sampling requirements for the diffuser. Compliant 17 GPS Drogue surface currents measurements. Minor Non-Compliant 19 Requirements for seabed sampling. Compliant 20 Requirements for the laboratory doing the analyses. Compliant 24 Requirements for an Annual Monitoring Report. Compliant 25 Requirement to publicise the annual report. Compliant 26 Requirement for a Public Open Day. Compliant 28 Defines the recording of complaints. Compliant Outlines the Consent Holder responsibilities in the event of non-compliances or possible non-compliances. Outlines the process for reporting non-compliances and providing further information on how and why the non-compliance occurred and contingent measures to address or minimise the non-compliances. Compliant Compliant 28

32 Compliance Assessments for Parts of Condition Introduction Conditions 24 has been briefly assessed in Sections to From that assessment it was concluded that Sub-conditions 24(f), 24(i), 24(j) and (k) required no further assessment as they had been assessed in detail in other sections of the report. The remaining Sub-conditions of Condition 24 require further analysis and/or discussions for completeness. A detailed assessment of the sub-conditions 24(a), (b), (c), (d), (e), (g) and (h) is presented in this section of the report in more detail. This section also provides a detailed assessment and discussion of the data recorded during the period under review. 5.2 Condition 24(a) Summary of All Monitoring Undertaken Condition 24(a) states that A summary of all monitoring undertaken as required by this consent, and may include details of additional monitoring undertaken by the consent holder to better characterize the effects of the discharge on Hawke Bay This section (Section 5) discusses all the monitoring undertaken as required by the consent. Where the monitoring has already been discussed as part of another condition, reference is made to the relevant sections where this has been covered Domestic & Non-Separable Industrial (DNSI) Flows Sampling Methodology for DNSI For the DNSI flow measurement, a flow pulse is generated every 100 m 3 which drives the sampler. One sampler is situated before the Biological Trickling Filter (BTF) pump station just after the control flume in the screening channel. The second sampler is located in the outlet chamber of both BTFs and is an area of high turbulence (to ensure good mixing). The samplers were run continuously for 7 days with containers being exchanged at 8am each morning. Each container was mixed, and subsamples taken, the samples were chilled, preserved or frozen as required for each test. Analysis and Results The samples are couriered to Hill Laboratories for analysis. Appendix C presents the sampling results for the DNSI. The following results and analyses are presented: - The Influent concentrations of TSS, cbod5, COD and Total Oil & Grease. - The Effluent concentrations of TSS, cbod5, COD and Total Oil & Grease. - BOD Loading Rates. - Percentage reductions in TSS, cbod5, COD and Total Oil & Grease. The data presented in Appendix C was also used to demonstrate compliance with Condition 5 in Section Final Combined Wastewater (FCW) Quantity and Quality Monitoring Sampling Methodology for FCW A pulse is generated every 200m 3 and this drives the sampler. The sampler is located on the outlet of one of the ocean outfall pumps. This provides an area of high turbulence (good mixing). The samplers were run continuously for 7 days with containers being exchanged at 8am each morning. Each container was mixed, and subsamples taken, the samples were chilled, preserved or frozen as required for each test. 29

33 Analysis and Results Testing for ph and conductivity was carried out at time of sampling. The quarterly samples were then couriered to Hill Laboratories for analysis for various analytes. The data was also used to demonstrate compliance with Condition 6 in Section 0. Appendix D presents the sampling results. The following results and analyses are presented: - FCW concentrations (in g/m 3 ) of TSS, cbod5, COD, Ammoniacal Nitrogen and Dissolved Phosphorus and various inorganic analytes in Schedule 1 and 2. - FCW loading rates (in kg/m 3 ) of TSS, cbod5, COD, Ammoniacal Nitrogen and Dissolved Phosphorus and various inorganic analytes in Schedule 1 and 2. - FCW average, maximum and minimum statistics of the concentrations and loading rates TSS, cbod5, COD, Ammoniacal Nitrogen and Dissolved Phosphorus and various inorganic analytes in Schedule 1 and 2. A number of other laboratory results that have not been presented elsewhere in this report are provided in Appendix F. Some of these additional tests and results are not required by the consent but they are presented in compliance with Condition 24(a). They include: - FCW organics. - FCW Organonitrogen and Organophosphorous Pesticides - FCW Volatile Organic Compounds Result - FCW Semi Volatile Organic Compounds Results - FCW Polychlorinated Byphenols Results Combined Wastewater Toxicity Assessment Sampling Methodology for Combined Wastewater Toxicity Toxicity samples were taken once every quarter. Each sample was tested for the following: Marine algae (Minutocellus polymorphus 48 hour growth test) Wedge shell (Macomona Liliana-96 hour survival and burial test) Blue mussel embryo test (Mytilus galloprovincialis 48 hour embryo development test) Sampling Results and Analysis The sampling dates, the methodology and the results have been discussed in detail in Section A more detailed analysis of the results is presented in Appendix G Receiving Water Quality Monitoring Sampling Methodology Measurements were taken around the outfall using a multiparameter probe for ph, tem perature, Dissolved Oxygen, Salinity, and Turbidity (YSI ProDSS probe) as discussed in Section for compliance with Condition 16. Sampling Results and Analysis The full dataset from the sampling is presented in Appendix I Marine Sediment Quality Monitoring Sampling Methodology The sampling methodology is described in detail in Section Sampling Results and Analysis Details of the analytes and a summary of results are presented in Section the full dataset and results of the data analysis. Appendix J provides 5.3 Condition 24(b) Analysis of Sampling Required by Condition 14 Condition 24(b) states that A critical analysis of the results of sampling required by Condition 13, in the Annual Monitoring Report completed the year following the collection of that data 30

34 Condition 24(b) refers to a critical analysis of the results of sampling of required by Condition 13. Condition 13 is no longer relevant to this consent and, therefore, a critical analysis has been provided of the results of the sampling required by Condition Condition 14 Compliance Assessment Condition 14 compliance assessment has been presented in Section 4.12 of this report. The TSS, CBOD5, and Total Oil & Grease sampling results and analysis are presented in Appendix C. The Final Combined Wastewater samples were analysed for the analytes in Schedule 1 and these are presented in Appendix D Critical Analysis of the DNSI Sampling Required by Condition 14 The wastewater treatment plant was designed and constructed to achieve a reduction in suspended solids roughly equivalent to Primary Treatment (the original consenting option). Table 9 shows the percentage reductions between the influent and the effluent analytes listed in Condition 14. The percentage reductions are calculated by subtracting the influent and effluent concentrations and expressing these are a percentage of the influent concentrations. Table 9 BTF Plant Performance - DNSI (% Reduction) TSS cbod 5 COD TOG Quarter 1 (1 Jul - 30 Sep 2017) 35.8% 80.8% 56.8% 73.6% Quarter 2 (1 Oct 31 Dec 2017) 78.7% 89.9% 77.1% 88.0% Quarter 3 (1 Jan - 31 Mar 2018)* 34.8% 4.1% 56.7% -5.1% Quarter 4 (1 Apr - 30 Jun 2018) 9.7% 75.6% 43.0% 66.5% Annual 40.1% 59.6% 58.4% 54.6% * The average concentrations of the February and March samples were used to calculate the Quarter 3 Reductions. The average TSS reduction at 9.7% was very low in the 4 th Quarter compared to the preceding quarters. However, the average reduction over the period under review was moderate at 40.1%. cbod5 reductions were positive and considerably high for three of the quarters except the 3 rd quarter where an average reduction of just 4.1% was observed. The average annual reduction was 59.6%. The average Total Oil and Grease reductions was negative in the 3 rd Quarter. It is not clear why this was the case as it should not be possible for an increase in TOG to occur after treatment. The likely cause of the negative value could be a sampling or sample analysis error for the three samples collected during the period February 2018 and one of the four samples collected in March It is noted that the 4 th Quarter results showed the correct trend with the average annual reduction over the period under review at over 54.6% Trend Analysis of the Treated DNSI Sampling Required by Condition 14 As part of the critical analysis of the data, Time Trends have been used to assess trends over the years including the current reporting year for: - BTF Treated Wastewater Total Suspended Solids; - BTF Treated Wastewater cbod5; - BTF Treated Wastewater COD; - BTF Treated Wastewater Total Oil and Grease; - Total Flow; and, - Loading Rate. The Mann-Kendall test was used to identify trends for the sampling and recording results and the calculated loading rates for the above analytes, flows and loading rates. The trend strength determined using the Theil Sen slope estimator. The significance level, p (probability) value, was set at alpha = 0.05 so all results from the Mann-Kendall trend analysis and Theil Sen assessment were considered statistically relevant if their associated two-sided p value was The analysis was carried out at the 95% Confidence Interval. To compare direction and significance of trends, trend slopes and p-values of real and estimated trends in a time series segment were classified in six trend classes: 31

35 - N3: significant decreasing trend (slope < 0 and p 0.05) - N2: non-significant decreasing trend (slope < 0 and 0.05 < p 0.1) - N1: no trend with decreasing tendency (slope < 0 and p > 0.1) - P1: no trend with increasing tendency (slope > 0 and p > 0.1) - P2: non-significant increasing trend (slope > 0 and 0.05 < p 0.1) - P3: significant increasing trend (slope > 0 and p 0.05). Appendix L presents a summary of the time trend analyses for the Treated DNSI (after the BTF) analytes and parameters listed above. Appendix L also provides commentary on the trend direction, the trend strength and the percentage annual change. Table 10 below is a summary of the key statistics of the trend analyses from Appendix L. Table 10 Summary of the Trend Analysis Statistics for the DNSI Sampling Parameter/ Analyte Minimum Value Maximum Value Median Z- Value P- Value Sen s Slope % Annual Change Trend Direction and Strength at 95% Level of Significance BTF TSS P1 BTF CBOD N/A BTF COD P1 BTF TOG P3 Flow 12,740 41,610 22, , P1 N/A Not increasing or decreasing The trend analysis results show that most of the parameters are increasing. However, in some cases there is no clear trend. The cbod showed neither an increasing nor decreasing trend. The trend analysis for FOG shows that there is a significant increasing trend. This slightly contrary to the decrease noted in Table 9. This is because the percentage reductions are based on quarterly data whereas the trend analysis covers the entire data range since the consent monitoring started Trend Analysis of the FCW Time Trend analysis has also been used to analyse the FCW using the sampling data for the following analytes: - Total Suspended Solids Load (TSS) - cbod5 - COD Load - Total Oil and Grease Load (TOG) - Acid Soluble Arsenic Load (Arsenic) - Acid Soluble Cadmium Load (Cadmium) - Acid Soluble Lead Load (Lead) - Acid Soluble Zinc Load (Zinc) - Acid Soluble Mercury Load (Mercury). - Acid Soluble Chromium Load - Total Sulphide Load - Acid Soluble Copper Load - Acid Soluble Nickel Load Appendix M presents a summary of the time trend analyses for the FCW using the sampling data for the analytes and parameters above. 32

36 Table 11 below is a summary of the key statistics of the trend analyses of the FCW from Appendix M. 33

37 Table 11 Summary of the Trend Analyses Statistics for the Final Combined Wastewater Data Parameter/ Analyte Minimum Value Maximum Value Median Z- Value P- Value Sen s Slope % Annual Change Trend Direction and Strength at 95% Level of Significance TSS 3,085 57,831 23, N1 CBOD 1,987 73,287 27, N1 COD Load 8, ,232 61, N1 TOG 385 9,753 4, N1 Arsenic N1 Cadmium P1 Lead N1 Zinc P1 Mercury P1 ChromiumIV P1 Sulphide , N1 Copper N1 Nickel N1 ChromiumVI P1 The trend analysis results show that most of the parameters are generally decreasing but with no definite trend. 65% of the analytes show a decreasing trend. The 35% showing an increasing trend do not provide a clear positive trend and could reflect a decreasing trend in future years. 5.4 Condition 24(c) Analysis of Monitoring Data and Environmental Effects Condition 24(c) states that A critical analysis of the monitoring information in terms of compliance and adverse environmental effects This section provides a discussion of the assessment of effects for the various contaminants and processes Assessment of Compliance with the Consent Conditions The extent to which the consent conditions were complied with has been discussed in detail in Section 4. Table 8 provides a summary of the compliance of the activities with the various consent conditions and, therefore, the potential adverse effects. All the consent conditions that required monitoring were complied with. A minor non-compliance has been highlighted against Condition 17. This was only because the drogue was not able to collect data for the 4 th Quarter. Given the data that is collected by the drogue (Table 7), the failure to collect data in the 4 th Quarter has no bearing on the environmental effects DNSI Monitoring and Adverse Environmental Effects A detailed discussion of the trend analysis for the DNSI has been provided in Section and above. In summary: - A comparison of the influent and effluent data shows a general reduction in the analytes and parameters that were monitored. - The trend analysis results show that most of the parameters are increasing albeit marginally. However, in many cases there is no clear trend. Given the huge reductions in analytes and the observed negative and small positive trends for most analytes, the likely effect on the environment is likely to be no more than minor FCW Monitoring and Adverse Environmental Effects Trend analysis for the monitoring data for FCW is discussed in Section The trend analysis results show that most of the parameters are generally decreasing but with no definite trend. 34

38 There is clearly no definite trend in the data to draw conclusions regarding the adverse environmental effects associated with the discharges of the combined flows Receiving Water Quality and Adverse Environmental Effects Dilution Rate and Environmental Effects Condition 4 of the consent states that The final combined wastewater discharged to Hawke Bay via the long offshore outfall shall pass through an ocean outfall diffuser which has been designed to achieve a minimum average dilution over the boil of not less than 100:1 on slack water The existing diffuser was designed for a 100:1 dilution at the diffuser to meet the Condition 4 requirements. The 100:1 dilution set based on the ANZECC 2000 guidelines for toxicants for slightly moderately disturbed systems. As the final combined wastewater complies with the minimum dilution rate at the diffuser, it is considered that the effect on the environment by the final combined wastewater was no more than minor as it meets the requirements in the ANZECC 2000 guidelines. Furthermore, the dilution rates increase further away from the diffuser as the concentrations of the analytes decrease with distance from the diffuser Assessment of Receiving Water Quality Differences between Sites Condition 16 requires sampling of the receiving water quality at 10 sites perpendicular to the centre of the diffuser at distances of 100 m, 250 m, 500 m, 750 m and 1000cm (on each side of the diffuser). HDC also takes samples at 2,000 m either side of the diffuser and the two river mounts as described in Section The sampling locations are shown on Figure 2 and the results are presented in Appendix I. In this section, a comparison of the difference in the concentrations of the various analytes and parameters between the sampling sites is assessed for the following parameters: - ph - Temperature - Salinity - Turbidity - Total Suspended Solids - Dissolved Oxygen - Dissolved Reactive Phosphorus - Total Phosphorus - Nitrite Nitrate Nitrogen - E Coli - Total Coliforms The data is represented by box and whisker graphs depicting the median, 25 th and 75 th quartiles, and the minimum and maximum. Bacteriological graphs are shown as the logarithm of the number analysed. If the sample shows less than 1, 1 has been used as the number for the purpose of analysis. Appendix N contains the box and whisker diagrams showing the levels found for each site A box and whisker diagram for Ammoniacal Nitrogen has not been presented as most of the results were below detection level. The analysis shows that there are no statistical differences between sites for any of the parameters Seabed Sediment Monitoring and Adverse Environmental Effects Sediment Accumulation and Environmental Effects Condition 19 requires an assessment of the sediment monitoring data. This assessment has been provided in Section The sampling results are presented in summary in Figure 3 and in more detail in Appendix J. 35

39 Only one sample (250 m North) taken on 13 September 2017 had a maximum concentration of mercury level of 0.2 mg/kg Figure 3 which was greater than the ISQG limit of 0.15 mg/kg. Subsequent sampling (on 24 November 2017 and 28 February 2018) at the same location returned mercury levels of 0.07 mg/kg and 0.06 mg/kg respectively. Figure 3 also shows that the concentrations of most analytes was generally highest near the diffuser with concentrations reducing outwards both north and south of the diffuser. The concentrations of most analytes appeared to be higher southwards than northwards a condition likely to be caused by the direction of the sea currents. When the results in Figure 3 (Appendix J) are compared with the results from previous years there is no evidence of accumulation of any compounds in the areas of deposition. In summary, most of the sediment results were below the ISQG- Low guidelines in ANZECC 2000 indicating a low environmental risk. Furthermore, Condition 19 states In the event that sediment monitoring required by this condition, results in two or more exceedances of ANZECC 2000 (ISQG - Low) sediment guidelines on one occasion of sampling, then an additional benthic survey shall be undertaken within one year of the sediment sampling exceedance(s) occurring. Therefore, no additional adverse effects were anticipated from the one exceedance Toxicity Trend Evaluation A detailed assessment of the compliance with regards to toxicants has been presented in Section 4.13 as part of the Condition 15 compliance assessment. The toxicity analysis is presented in Appendix G. The Time Trends analysis of toxicity samples taken once every quarter are presented in Appendix O and key statistics are summarised in Table 12. The trend direction and strength is based on the rules described in Sections 3.2 and Table 12 Summary of the Trend Analyses Statistics for Toxicants Sen s % Annual Parameter/Analyte P-Value Z-Value Slope Change Algae Wedge Shell 96 hr Acute Survival Wedge Shell Morbidity (60 minutes Reburial) Trend Direction and Strength N1 No trend with decreasing tendency N1 No trend with decreasing tendency P1 No trend with increasing tendency Blue Mussel Embryo trend analysis was not completed because the available data did not yield any statistics and there was no clear trend from the analysis. Table 12 shows a decreasing tendency for Algae and Wedge Shell. 5.5 Condition 24(d) Compliance with the Trigger Values Condition 24(d) states that An assessment of compliance in relation to the trigger values set out in the table below Analyte Trigger Value 2 cbod5 1 48,000 Kg/day Total Suspended Solids 1 39,000 Kg/day Total Daily (annual average) volume 66,000 m 3 /day 1 The annual average mass load is calculated by multiplying the result for each day by the volume each day and then averaging the loads. 2 The trigger value is calculated as an upper tolerance limit based on annual mean results from 1998 to 2013 inclusive. An analysis of the loading rates was carried out in compliance with Conditions 6 and 8. The results of the analysis is presented in Appendix D. There the average loading rates for cbod5, Total Suspended Solids and Total Daily Annual Volume during the period under review have been extracted from Appendix D and summarised in 36

40 Table 13 below. 37

41 Table 13 Compliance with Trigger Values Analyte cbod5 Total Suspended Solids Trigger Value (Condition 24) This Year s Average 48,000 Kg/day 22,717 Kg/day 39,000 Kg/day 19,632 Kg/day Total Daily (annual average) volume 66,000 m 3 /day 45,907 m 3 /day Trend Analysis N1: no trend with decreasing tendency (Refer to Section 5.3.4) N1: no trend with decreasing tendency. (Refer to Section 5.3.4) N1: no trend with decreasing tendency 38

42 Table 13 confirms that the trigger levels specified in Condition 24(d) were complied with during the operational year 1 July June An analysis of the time trends for cbod5, Total Suspended Solids and Total Daily Volumes has been carried out and reported in Section A summary of the trends is also presented in 39

43 Table 13 above. 5.6 Condition 24(e) Non-Compliance and Operational Issues Condition 24(e) states that Comment on any non-compliances and operational problems, and any actions undertaken to address these. This section discusses these issues, where applicable Treatment Plant Performance This section relates to the overall performance of the plant and the discharge through the long ocean outfall. The performance of the BTF is covered in Section 4. Over the past year the plant has performed well, the volumes discharged are well below the design of the plant and are compliant with the discha rge rate in the consent. The trigger values for Flow, Total Suspended Solids and cbod5 have not been exceeded Non-Compliances All the consent conditions that required monitoring were complied with. A minor non-compliance has been highlighted against Condition 17. This was only because the drogue was not able to collect data for the 4 th Quarter. This has since been repaired and was working properly at the time of writing this report Operational Issues There were no major operational issues during the period under review Actions Undertaken to Address Issues No major actions were required. 5.7 Condition 24(g) Trend Analyses Condition 24(g) states that Identification and comment on any trends in volumes, flows, toxicity (EC50 or LC50) and contaminant loads over the reporting period and compared to previous years. This shall include any trends in water quality parameters/wastewater constituents including comment on the potential environmental implications of these trends Time trends analyses have been carried out in Sections 5.3.3, and environmental impacts of these trends are also discussed in Sections 5.4. The potential 5.8 Condition 24(i) Proposed Changes to Consent Conditions Condition 24(i) requires that the monitoring report provides Details of any changes to the consent conditions that may be applied for within the next 12 month period A number of changes to the consent conditions were suggested in the 2016/17 Annual Report. These were not initiated during the 2017/2018 period. HDC plans to submit consent applications for these during the 2018/2019 reporting period. The following is a list of the proposed changes to the consent conditions Proposed Change to Condition 15 The cost of carrying out the toxicity test is currently $41,764 (excl. GST) per annum currently and will increase to $43,257 for the coming year. These are extremely expensive tests on one sample per quarter and the value of the data is questionable. Hastings District Council has now been carrying out these tests for over 20 years and has demonstrated that the theoretical risk (based on 200:1 dilution) is low. 40

44 As the cost of testing is significant HDC suggests a change to annual testing may be appropriate. If the change is made to annual testing HDC suggests an additional condition be added that if any samples exceed the consented requirements a sample shall be sent for toxicity testing during the next sampling period. This would be a trigger level type approach as is currently being used for Flow, TSS Load and cbod5 load. This approach is becoming common practice in wastewater discharge consents Proposed Change to Condition 25 HDC suggests that the last sentence be changed to: Notification of the availability of the Annual Report shall be included in the Public Notice advertising the Open Day. 41

45 Conclusions This report has assessed the compliance of Consent CD130214W. The report has shown that the consent conditions were by and large complied with. Overall the current treatment and discharge through the long offshore ocean outfall is not only compliant with resources consent conditions but also provides for an environmentally and culturally acceptable, sustainable and economic solution for wastewater from the Hastings District Council. 42

46 Appendix A Resource Consent Conditions 43

47 1 The Consent Holder shall discharge the final combined wastewater as authorised by this Resource Consent generally in accordan ce with the information supplied with the application. Where a conflict exists between the application and the conditions of this Resource Consent, the conditions shall prevail. 2 The rate of discharge of the final combined wastewater (see Advice Note 1) shall not exceed 2,800 litres per second. 3 The discharge of the final combined wastewater as authorised by this Resource Consent shall be by way of the existing long of fshore outfall structure located at the end of Richmond Road, East Clive, and shall take place between approximately 2,450m and 2,750m offshore, being approximately NZMG The final combined wastewater discharged to Hawke Bay via the long offshore outfall shall pass through an ocean outfall diffu ser which has been designed to achieve a minimum average dilution over the boil of not less than 100:1 on slack water. Wastewater Treatment Standards 5 The final combined wastewater discharged shall meet the following requirements: a) All separable industrial wastewater shall pass through a milliscreen having a maximum aperture slot width of 1mm. b) All domestic and non-separable industrial wastewater shall pass through a 3mm diameter hole size screening device or equivalent, followed by treatment in a biological trickling filter, with an annual average daily loading of carbonaceous biochemical oxygen demand (5 day test) (cbod5) that shall not exceed 0.4 kg per cubic metre of media, with the treatment plant managed in accordance with best wastewater engineering practice and industry standards, and: I. the media in the biological trickling filters shall consist of randomly packed plastic material that provides a specific surface area of not less than 90m2/m3, and II. ii) the wastewater remaining after that treatment, prior to being discharged, shall pass through the Rakahore channel. 6 The final combined wastewater discharged shall meet the following standards: Analyte Maximum Concentration (g/m 3 ) Maximum Loading (Kg/day)* Chromium III Chromium VI Copper Zinc Cadmium Mercury Lead Nickel Ammonia * The maximum daily loading limit is based on the maximum treated wastewater concentration limits multiplied by the 75%ile wastewater flow rate (52,070m 3 /day) over 12 months in 1998 (a dry year). In the event that a limit is exceeded for any analyte, an additional 24 hour flow proportional sample shall be collected and tested for that analyte within 5 working days of receipt of the laboratory result. An investigation shall also be undertaken into the cause of the exceedance, and the findings of the investigation recorded and provided to the Regional Council (Manager Resource Use) within one month of the exceedance occurring. 7 The discharge of the final combined wastewater as authorised by this Resource Consent shall not cause any of the following effects beyond a distance of 750m from the midpoint of the outfall diffuser: a) The production of any conspicuous suspended materials; or b) Any conspicuous change in the colour or visual clarity; and shall not cause any of the following effects beyond a distance of 500m from the midpoint of the outfall diffuser: c) The production of any conspicuous oil or grease films, scums or foams, or floatable materials; or d) Any emission of objectionable odour; or e) Any significant adverse effects on aquatic life, or f) A change of the natural temperature of the receiving water by more than 3 degrees Celsius, or g) The Dissolved Oxygen concentration to be less than 80% of the saturation c h) Undesirable biological growths. 44

48 8 The average concentration of Total Oil and Grease in the final combined wastewater shall not exceed 200g/m3 over any 24 hour period based on the sampling procedure set out in Conditions 13 and The Consent Holder shall inspect the diffuser at least annually and at intervals not more than14 months apart, and at any o ther time as necessary, at which time any ports blocked by mussels or other debris will be cleared. The number of blocked ports shall be recorded and reported in the Annual Monitoring Report required by Condition 24 of this consent. 10 The Consent Holder shall ensure that all components of the wastewater treatment plant and outfall structures (including the d iffuser on the long offshore outfall) are maintained in good working order, and in accordance with industry best practice guidelines. 11 The Consent Holder shall ensure that all sampling equipment, including meters and field measurement devices are maintained in good working order by suitably qualified persons in accordance with the manufacturer's instructions and industry best practice guidelines. Records of calibration shall be kept and mad e available to the Council (Manager Resource Use) upon request. 12 The Consent Holder shall continuously monitor and record the rate of discharge and the daily volume of the final combined was tewater is charged. The flow meters used to record the discharge shall have an accuracy within plus or minus 5%, as per the manufacturer's calibration records. 13 For a period of 12 months, from the date of commencement of this consent, at quarterly intervals, with not less than 2 months between each sample, the Consent Holder shall take two flow proportional samples during each 24 hour period on a minimum of 7 consecutive days. The samples shall be taken from the following waste streams, and analysed for the constituents stated: a) The domestic and non-separable industrial wastewater prior to the biological trickling filter treatment. These samples shall be analysed for: i) Total suspended solids; ii) iii) Total oil and grease; and cbods. b) The domestic and non-separable industrial wastewater immediately after the biological trickling filter treatment. These samples shall be split into 2 separate samples which will be analysed separately. One sample shall be taken during the 21 hours of normal operation. One sample shall be taken during the 3 hours of the biomass flushing cycle. These samples shall be analysed for: i) Total suspended solids; ii) iii) Total oil and grease; and cbods. c) The final combined wastewater. These samples shall be analysed for the analytes listed, at the detection limit shown, in Sche dule 1 (attached) for quarterly and annual sampling. 14 Starting 12 months from the date of commencement of this consent, at quarterly intervals, with not less than 2 months between each sample, the Consent Holder shall take 24 hour flow proportional samples on a minimum of 7 consecutive days of the following waste streams, and analyse them for the constituents stated: (b) (c) (a) The domestic and non-separable industrial wastewater prior to the biological trickling filter treatment. These samples shall be analysed for: i) Total suspended solids; ii) Total oil and grease; and iii) cbods. The domestic and non-separable industrial wastewater immediately after the biological trickling filter treatment. These samples shall be analysed for: i) Total suspended solids; ii) Total oil and grease; and iii) cbods. The final combined wastewater. These samples shall be analysed for the analytes listed, at the detection limit shown, in Schedule 1 (attached) for quarterly and annual sampling. 15 At quarterly intervals, with not less than 2 months between each sample, the Consent Holder shall test the toxicity of the final combined wastewater to at least th ree species of marine organisms to determine if there is a statistically significant effect. A plan outlining the proposed testing method and the organisms to be tested shall be submitted to the Regional Council (Manager Science) for approval within 2 months of the commencement date of this consent. Changes to the plan (including changes to the organisms te sted) can be made but must be submitted to the Regional Council for approval before the proposed changes can be made. The interpretation of results and the actions shall be undertaken using an adaptive management approach as is detailed in the figure on Page 5 of the Consent. 45

49 16 At quarterly intervals, with not less than 2 months between each sample, the Consent Holder shall take water quality samples at 10 sites perpendicular to the centre of the diffuser at distances of 100m, 250m, 500m, 750m and 1000m (on each side of the diffuser). These samples will be analysed for faecal coliform and enterococci. Field measurements are to be made of ph, salinity, tu rbidity, temperature, and dissolved oxygen (%saturation) at each location as well. 17 While samples are being taken in accordance with Condition 16, a GPS drogue shall be placed at the centre of the diffuser to measure the surface currents for at least 30 minutes. 18 The Consent Holder shall undertake surveys designed to show the impact of the discharge on the benthic fauna: a) The benthic survey shall include an assessment of marine sediments, benthic ecology, and trace metals in flatfish (comparable to that carried out by Golders Associates in 2012 and 2013) and shall be undertaken in the 8 th, 17 th, and 26 th years after the commencement date of this Resource Consent. The final design of each survey shall be submitted to the Regional Council (Manager Science) for approval prior to each survey being undertaken. Flatfish of the same species as those collected a t the time of the first benthic survey required by this consent shall also be tested for pathogenic bacteria and parasites (see Advice Note 3). The results of all benthic surveys shall be provided to the Regional Council (Manager Resource Use) within 1 month of being received by the Consent Holder. 19 Twice during the year (summer and winter) the Consent Holder shall take seabed sediment grab samples at distances of approxim ately 250m, 500m and 750m to the north and 250m, 500m and 750m to the south of the midpoint of the outfall diffuser. Those samples shall be analysed for the analytes listed, at the detection limit shown, in Schedule 2. In the event that sediment monitoring required by this condition, results in two or more exceedances of ANZ ECC 2000 (ISQG - Low) sediment guidelines on one occasion of sampling, then an additional benthic survey shall be undertaken within one year of the sediment sampling exceedance(s) occurring. However, no m ore than one additional survey shall be required by this condition to be undertaken within each 9 year period specified in Condition 18 a). 20 All quality analysis of the wastewater discharged other than field measurements as required by the conditions of this consent shall be undertaken by an independent laboratory accredited to IANZ or other laboratory approved by the Regional Council (Manager Resource Use). Field measurements shall be undertaken in accordan ce with best industry practice. 21 Within three months of the commencement date of this consent, the Consent Holder shall submit to the Regional Council (Manager Resource Use) a Memorandum of Understanding (MOU) which shall include, but is not limited to the following: (a) (b) (c) (d) Details of sampling methodologies and procedures to be followed; Protocols that will be observed; Details of sampling locations; Details of when information (including data and sampling results) needs to be provided to the Regional Council, and in what format. The MOU shall be prepared in consultation with the Regional Council (Manager Resource Use) and can be varied upon agreement between the two parties. All sampling shall be undertaken in accordance with the MOU. All records collected in accordance with the conditions of this Resource Consent shall be provided to the Regional Council (Manager Resource Use) at the times and in the formats specified in the MOU. Until the M OU is prepared, records shall be provided to the Regional Council (Manager Resource Use) no more than one month following the end o f the month to which they relate, except for the flow data required in accordance with Condition 12 of this consent which shall be provided at quarterly intervals. Administration 22 The Consent Holder shall ensure that at all times clear and visible signage is placed on the buoys marking the two ends of the diffuser, incorporating the words "Shellfish unfit for human consumption". 23 The Consent Holder shall appoint a person to be responsible for the day-to-day operation of the treated wastewater disposal system and to act as a contact person for the Regional Council. The name and phone number of this contact person shall be advised to the Regional Council (Manager Resource Use) within 10 wo rking days of the commencement date of this consent and within 10 days of any change. 24 Before 1 October each year, the Consent Holder shall provide the Regional Council (Manager Resource Use) with an 'Annual Moni toring Report', covering the preceding 12 month period ending 30 June. The report shall be submitted together with a peer review completed by a suitably qualified and experienced professional expert. This mon itoring report shall include, but not be limited to: a) A summary of all monitoring undertaken as required by this consent, and may include details of additional monitoring undertaken by the consent holder to better characterize the effects of the discharge on Hawke Bay; b) A critical analysis of the results of sampling required by Condition 13, in the Annual Monitoring Report completed the year following the collection of that data. 46

50 c) A critical analysis of the monitoring information in terms of compliance and adverse environmental effects; d) An assessment of compliance in relation to the trigger values set out in the table below. Any exceedances of these trigger values shall be clearly identified and reasons for each exceedence (if known) provided. Commen t shall also be provided about the significance of the exceedance in terms of effects (if any) on the receiving environment, and any measures that may be appropriate to reduce the concentration of the relevant analyte should that be necessary having regard to any adverse environmental effects. An assessment of trends in the concentrations of these parameters over the previous year, and also over the term of this Resource Consent must also be provided; Analyte Trigger Value 2 1 cbod 5 48,000 Kg/day Total Suspended Solids 1 39,000 Kg/day Total Daily (annual average) volume 66,000 m 3 /day 1 The annual average mass load is calculated by multiplying the result for each day by the volume each day and then averaging the loads. 2 The trigger value is calculated as an upper tolerance limit based on annual mean results from 1998 to 2013 inclusive. e) Comment on any non-compliances and operational problems, and any actions undertaken to address these; f) Details of any works undertaken or proposed to improve the performance of the treatment system, and the timeframe for completion of any proposed works; g) Identification and comment on any trends in volumes, flows, toxicity (EC50 or LC50) and contaminant loads over the reporting period, and compared to previous years. This shall include any trends in water quality parameters/wastewater constituents including comment on the potential environmental implications of these trends; and h) Recommendations regarding alterations or additions to the monitoring programme; i).details of any changes to the consent conditions that may be applied for within the next 12 month period; j) Details of the date of the plant open day, numbers in attendance, and written questions submitted by members of the public, and responses given (except that this subsection cannot be addressed in the first Annual Monitoring Report completed in accordance with the conditions of this consent); and k) The tabulated results of the laboratory analytical monitoring. 25 Each Annual Monitoring Report shall be made publicly available on the Consent Holder's website within one month of it being lodged with the Regional Council (Manager Resource Use). Notification of the availability of this Report shall also be included in the Consent Holder's next public newspaper general ratepayers' notice and also the next ratepayer newsletter. 26 During the month of November each year, the Consent Holder shall have a public 'open day' at the Wastewater Treatment Plant site, located on Richmond Road. Notification of this open day sh all be done via the Consent Holder's website and in a Consent Holders public newspaper general ratepayers' notice at l east 10 working days before the open day. The open day shall be attended by Hastings District Council Staff as well as a Regional Council Compliance Officer. The purpose of the open day is to give the community an opportunity to view the treatment plant, and discuss the Annual Monitoring Report. It is also an opportunity for members of the public to submit written questions to whi ch the Consent Holder shall respond in writing within one calendar month. Details of the date of the open day, numbers in attendance, written questions submitted and responses given shall be included in the next Annual Monitoring Report, as noted in Condition 24(j) above. 27 The Consent Holder shall submit to the Regional Council (Manager Resource Use) a Trends, Technology, Discharge, Environmental and Monitoring Review Report not later than the 9 th, 18 th and 27 th year anniversaries of the issue of this discharge permit. Each Review Report shall be made publicly available on the Consent Holder's website within one month of being lodged with the Regional Council. Notification of the availability of this Report shall be included in the Consent Holder's next public newspaper general ratepayers' notice and also the next ratepayer newsletter. The Review Report shall address as a minimum, but not be limited to, the following matters for the nine year period since the last review: a) Comparisons of population and industrial changes and possible trends as compared to the Heretaunga Plains Urban Development Strategy (2010) (HPUDS), and then latest reports on the Hastings Urban Development Strategy and the Hastings Industrial Strategy; b) Volumes, flows and loads profile and changes assessed against future projections and wastewater projections as set out in section 4.3 of the Hastings Wastewater Resource Consents Project: Assessment of Effects n the Environment and Resource Consent Applications copy dated June 2013; c) Trade waste profiles, trends and any significant changes in the Consent Holder's trade waste management practices and the trade waste contaminant profile; d) Any new changes to environmental guidelines and I or standards applicable to the discharge of treated wastewater into Hawke Bay; e) Changes in asset management and operational matters that may have relevance to the on-going operation and development of the Consent Holder's Wastewater Scheme from the perspective of the treated wastewater discharge, water conservation and efficient energy management; f) Changes in wastewater treatment technologies that may be relevant to the Hastings Wastewater Scheme for either the domestic and non-separable waste stream and I or the industrial waste stream; g) The results of a recreational usage survey undertaken during the nine year period, which is comparable to the survey undertaken between the summers of 2011 and 2013 (See Advice Note 4), and comparison of those results with previous surveys; h) Options for treated wastewater disposal I discharge and beneficial reuses that may be appropriate to the Wastewater Scheme; i) i) Effects of the treated wastewater discharge into Hawke Bay as evident from the resource consent monitoring; and 47

51 j) Details of consultation undertaken with the community to ascertain their views of the effects of the current wastewater discharge (see Advice Note 5). Consideration of this existing Resource consents project objectives, opportunities for improvement and Best Practicable Option (BPO) in terms of the interpretation of this term in the Resource Management Act The Consent Holder shall log all complaints received relating to the discharge. The log shall include: a) The date and time of the complaint; b) The nature of the complaint; c) The name, telephone number, and address of the complainant; d) Weather and sea condition information (including an estimate of wind speed and direction, and description of sea condition); e) Details of key operating parameters at the time of the complaint; and f) Any remedial action taken to prevent further incidents. Complaints shall be reported to the Regional Council (Manager Resource Use) within 24 hours of receipt, and the log of complaints shall be made available to the Regional Council (Manager Resource Use) on request. Any complaints relating to potential adverse health effects associated with exposure to the wastewater discharge shall be notified to the Hawke's Bay District Health Board within 24 hours of receipt also. 29 In accordance with the principles of the Treaty of Waitangi (especially those of partnership and consultation) and recognising the role of Tangata Whenua as Kaitiaki, the Consent Holder shall establish, and retain, as a committee of the Hastings District Council under Clause 31, Schedule 7, Local Government Act 2002, a Council Committee, half of the members of which shall be Tangata Whenua representatives the functions of which shall include: a) Developing the Hastings District Council's wastewater treatment and disposal system policies; b) Receiving, reviewing and recommending action on reports concerning the operation and performance of the Council's wastewater disposal system, treatment plant and ocean discharge; c) Receiving, reviewing and recommending from time to time the comm1ss1oning of reports and future Hastings District Council actions on wastewater issues including: i. Options for further or other treatments; ii. Options for alternative methods of disposal; and iii. Monitoring effects on the environment; d) Co-ordinating and overseeing education of the community including Tangata whenua and trade waste dischargers on wastewater issues; e) Not less than three months before each of the Trends, Technology, Discharge, Environmental and Monitoring Nine Yearly Review as required in accordance with Condition 27 is commenced by the Consent Holder, providing to the Consent Holder any further suggested input in respect to the scope of the review; f) Advising the Consent Holder on the Condition 27 Trends, Technology, Discharge, Environmental and Monitoring Nine Yearly Review before it is finalised and submitted to the Regional Council (Manager Resource Use) (See Advice Note 6); and g) Recognising the role of Tangata Whenua as Kaitiaki and the need to recognise and seek to satisfy the cultural concerns of Tan gata Whenua. 30 In the event of the Consent Holder becoming aware of: a) unusual or extreme circumstances (not being circumstances such as would provide a defence under sections B, Resource Management Act 1991) that may lead to one or more of the conditions of this Resource Consent being breached, or b) circumstances having occurred that have, or could, lead to on-compliance, immediate notification of such problems shall be made to the Regional Council (Manager Resource Use). This not ification shall include, but not be limited to, provision of the following information as far as such information is known to the Consent Holder at that time: v. The extent of non-compliance if it has occurred, including the duration of non compliance, volume discharged during that period, and the nature and quality of the discharge; vi. The immediate and further planned measures being undertaken to minimise and mitigate any adverse effects of the non-compliance; vii. The Consent Holder's assessment of public health risk arising from the event including advice received from the Hawke's Bay District Health Board Chief Executive Officer and Medical Officer of Health; and viii. Updating the Regional Council (Manager Resource Use) at not greater than 24 hourly intervals of the current situation until the problems are rectified and the Consent Holder is compliant with the Resource Consent conditions. 31 Within one calendar month of any unforeseen event that resulted in non-compliance with the conditions of this Resource Consent, the Consent Holder shall provide a further report to the Regional Council (Manager Resource Use). This report shall include, but not be limited to the provision of any further information on the reasons for the non-compliance and the measures investigated and put in place or to be put in place to avoid or at least minimise the possibility of any similar problems in the future that may cause non-compliance. 32 The Consent Holder shall make available to the Regional Council (Manager Resource Use) upon request records kept in relation to the discharge, and its effects on the environment including sampling, testing, and analysis. 48

52 49

53 Appendix B Analysis of Flows Condition 2 50

54 Daily Flows (L/s) for the Period 1 July June 2018 Date Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun , , , , , ,379 1, , , , , , , , , ,927 1, , ,057 1, , ,445 1, , , , , , , , Average Flows Maximum Flows 2,397 1, ,897 1,193 1,122 1,194 1,927 1, ,194 Minimum Flows

55 Appendix C DNSI Daily Loading cbod5 Condition 5 52

56 Start Date 24 Hour Flow Proportional Sample Total Suspended Solids (g/m 3 ) INFFLUENT CONCENTRATIONS EFFLUENT CONCENTRATIONS LOADINGS PERCENTAGE REDUCTIONS Biochemical Chemical Biochemical Chemical Oxygen Oxygen Total Oil and Total Oxygen Oxygen Total Oil and Loading Total Biochemical Chemical Demand Demand Grease Suspended Demand Demand Grease Influent BOD Rate Suspended Oxygen Oxygen (g/m 3 ) (g/m 3 ) (g/m 3 ) Solids (g/m 3 ) (g/m 3 ) (g/m 3 ) (g/m 3 ) Flow m3/day (kg/day) kg/m 3 /day Solids Demand Demand 4-Sep ,390 4, % 78.7% 58.4% 81.1% 5-Sep ,000 5, % 73.5% 50.0% 72.3% 6-Sep ,040 6, % 88.6% 81.8% 80.6% 7-Sep ,080 6, % 79.9% 60.0% 65.0% 8-Sep ,090 4, % 82.5% 60.0% 72.1% 9-Sep ,990 4, % 83.9% 56.9% 54.5% 10-Sep ,220 4, % 78.8% 30.4% 70.6% Average ,544 5, % 80.8% 56.8% 70.9% 24-Nov ,870 4, % 92.1% 76.9% 87.7% 25-Nov ,880 3, % 88.9% 74.6% 87.5% 26-Nov ,760 2, % 89.3% 76.3% 89.8% 27-Nov ,770 3, % 92.0% 70.2% 70.6% 28-Nov ,760 4, % 87.8% 76.2% 80.6% 29-Nov ,010 4, % 89.4% 80.8% 82.2% 30-Nov ,120 5, % 89.6% 84.6% 92.9% Average ,596 4, % 89.9% 77.1% 84.5% 22-Feb ,120 4, % 88.0% 59.6% -40.9% 23-Feb ,940 4, % 85.5% 50.9% % 24-Feb , % 86.9% 64.5% -13.9% Average ,270 4, % 86.8% 58.4% -57.6% 5-Mar , % % 0.0% -66.7% 6-Mar ,690 4, % 93.8% 72.0% 90.3% 7-Mar ,820 4, % 84.8% 70.7% 80.0% 8-Mar ,214 3, % 83.7% 77.7% 86.4% Average ,609 3, % -78.7% 55.1% 47.5% 24-Jun ,264 4, % 79.5% 40.0% 64.2% 25-Jun ,505 4, % 78.5% 50.8% 60.3% 26-Jun ,349 4, % 65.2% 22.7% 64.8% 27-Jun ,306 5, % 77.5% 57.4% 77.1% 28-Jun ,461 4, % 78.3% 52.5% 58.7% 29-Jun ,656 3, % 74.0% 31.6% 77.3% 30-Jun ,005 4, % 76.0% 46.2% 63.2% Average ,364 4, % 75.6% 43.0% 66.5% Annual Average ,992 4, % 59.6% 58.4% 56.1% Minimum , % 77.2% 60.3% 59.2% Maximum ,080 6, % 49.1% 61.0% 53.5% Total Oil and Grease 53

57 Appendix D FCW Concentrations & Loading Rates Conditions 6 and 24(a) 54

58 Appendix E Daily Volumes Condition 12 55

59 Daily Volumes (m 3 /day) for the Period 1 July June 2018 Date Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun ,020 44,490 45,320 29,130 43,370 44,390 21,320 49,930 53,120 41,440 73,670 46, ,120 52,540 35,260 35,590 44,530 38,610 23,580 50,810 51,480 33,410 61,290 38, ,400 49,700 31,250 39,090 41,440 30,970 30,630 41,370 42,960 42,210 58,500 32, ,470 44,990 40,760 38,850 32,580 38,820 33,500 39,110 40,460 50,320 54,510 57, ,860 39,580 43,800 39,370 27,720 44,630 40,590 40,960 50,100 54,770 45,760 53, ,480 34,660 46,170 38,810 35,020 42,430 36,140 32,190 54,970 55,940 36,600 53, ,900 42,310 46,000 34,640 41,040 43,930 30,560 43,110 57,990 53,690 47,860 54, ,840 44,870 41,780 38,010 43,630 41,580 40,060 52,180 88,030 44,220 54,120 54, ,470 47,290 34,890 75,610 43,200 36,970 48,820 54,860 66,240 49,970 56,850 47, ,530 46,440 29,740 71,330 41,270 29,800 49,110 48,840 49,080 65,060 57,010 39, ,480 43,760 36,840 58,890 32,140 38,490 48,420 38,950 42,070 66,180 53,290 48, ,530 36,100 41,790 53,720 27,200 42,630 47,380 50,120 50,990 56,930 47, , ,360 31,330 43,320 49,640 35,190 45,170 43,020 53,110 56,370 55,650 51,880 87, ,000 35,610 41,780 40,580 40,590 49,830 35,730 51,060 60,820 46,420 53,040 78, ,810 40,910 40,600 34,530 42,070 47,780 43,320 55,760 64,110 45,460 57,770 69, ,260 43,010 32,060 42,750 41,250 38,330 47,520 50,160 63,880 59,430 55,100 57, ,660 42,310 27,870 45,340 41,940 28,930 48,110 45,250 50,750 58,400 54,290 46, ,160 42,400 34,160 45,460 33,130 41,720 48,740 41,780 45,750 57,640 50,400 52, ,080 36,740 41,320 44,850 26,280 45,730 46,090 50,680 55,170 58,870 42,760 58, ,190 33,630 43,870 35,090 35,700 47,350 40,020 55,460 62,010 59,960 35,570 60, ,810 36,860 44,380 31,950 39,760 44,780 36,730 56,490 61,710 50,280 45,340 62, ,510 41,750 41,770 29,380 41,830 40,150 41,580 55,980 62,420 44,390 52,750 59, ,950 43,230 37,820 28,280 42,280 31,910 47,460 53,460 64,460 52,600 55,640 44, ,100 42,850 29,550 38,680 41,670 25,270 45,340 45,850 53,270 56,030 53,710 38, ,320 41,170 36,560 45,430 32,040 20,910 46,530 43,560 49,300 39,090 56,620 47, ,590 35,680 38,500 45,090 28,240 25,920 43,460 50,550 57,830 43,920 42,260 54, ,400 30,520 40,290 41,480 39,160 28,960 37,820 53,150 63,660 52,420 37,050 53, ,940 37,380 40,230 33,190 43,400 28,690 34,780 52,170 64,990 42,980 48,340 52, ,130 50,500 40,170 29,860 44,280 26,520 40,600 60,280 49,680 52,420 50, ,360 45,240 33,720 35,480 43,380 26,630 48,810 46,590 55,380 52,730 41, ,600 46,590 43,230 26,000 48,610 38,800 53,050 Average Flows 50,333 41,434 38,719 41,720 38,178 36,898 41,109 48,461 55,795 51,425 51,525 55,287 Max Flows 85,000 52,540 46,170 75,610 44,530 49,830 49,110 56,490 88,030 66,180 73, ,720 Statistic Quarter 1 Quarter 2 Quarter 3 Quarter 4 Minimum 27,870 20,910 21,320 32,240 25% Percentile 37,490 32,250 41,730 46,420 Median 42,455 39,565 48,815 53,040 75% Percentile 46,590 43,395 53,810 56,930 Maximum 85,000 75,610 88, ,720 56

60 Appendix F Additional Sampling Results for Final Combined Wastewater Condition 24(a) 57

61 Appendix G Toxicity Analysis Results Condition 15 58

62 Appendix H Adaptive Management Decision Tree Condition 15 Figure G1 - Decision Tree 59

63 Appendix I Receiving Water Quality Results Condition 16 60

64 Table H1 Receiving Water Sampling Results Date Site ph Temp ( 0 C) Dissolved Oxygen (%) Turbidity (NTU) Salinity (PSU) Total Suspended Solids (g/m 3 ) Total Ammoniac al Nitrogen (g/m 3 ) Nitrate+ Nitrite Nitrogen (g/m 3 ) Total Nitrogen (g/m 3 ) Dissolved Reactive Phosphorous (g/m 3 ) Total Phosphorous (g/m 3 ) Faecal Coliform (cfu / 100mL) 13/09/ North < < 1 < 1 13/09/ North < < 1 < 1 13/09/ North < /09/ North < < 1 13/09/ North < < 1 < 1 13/09/ North < /09/ South < < /09/ South < < 1 < 1 13/09/ South < < 1 < 1 13/09/ South < < 1 < 1 13/09/ South < < /09/ South < < 1 < 1 13/09/2017 Tukituki < < /09/2017 Ngaruroro < < 1 < 1 24/11/ North < 1 < 1 24/11/ North < < /11/ North < < /11/ North < /11/ North /11/ North /11/ South < /11/ South < < /11/ South < < 1 < 1 24/11/ South < < /11/ South < /11/ South < < /11/2017 Tukituki < < 1 < 1 24/11/2017 Ngaruroro < < 1 < 1 28/02/ North < /02/ North /02/ North < < /02/ North < /02/ North /02/ North < < /02/ South < < /02/ South /02/ South /02/ South < /02/ South E. Coli (cfu / 100mL)

65 Date Site ph Temp ( 0 C) Dissolved Oxygen (%) Turbidity (NTU) Salinity (PSU) Total Suspended Solids (g/m 3 ) Total Ammoniac al Nitrogen (g/m 3 ) Nitrate+ Nitrite Nitrogen (g/m 3 ) Total Nitrogen (g/m 3 ) Dissolved Reactive Phosphorous (g/m 3 ) Total Phosphorous (g/m 3 ) Faecal Coliform (cfu / 100mL) 28/02/ South < < /02/2018 Tukituki < /02/2018 Ngaruroro < /6/ North < 3 < < /6/ North < /6/ North < < /6/ North < < < 1 27/6/ North < /6/ North /6/ South /6/ South /6/ South /6/ South /6/ South /6/ South /6/2018 Tukituki /6/2018 Ngaruroro E. Coli (cfu / 100mL) 62

66 Appendix J Seabed Grab Sampling Results Condition 19 63

67 Table J1 - Sediments - Metals Analysis 2017/18 Average and Maximum Concentrations Site Tin Arsenic Cadmium Chromium Copper Lead Mercury Acid Sol n Mercury Nickel Zinc mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg dry weight dry weight dry weight dry weight dry weight dry weight dry weight dry weight dry dry weight weight ISQG Low m North Average < Maximum < m North Average < Maximum < m North 250m South 500m South 750m South Average < Maximum < Average < Maximum < Average < Maximum < Average < Maximum < Table J2 - Sediments - Volatile Solids & Grain size - Average (maximum in parenthesis) Site Volatile Solids Greater than 2mm 2mm to 63 microns Less than 63 microns 750m North 500m North 250m North 250m South 500m South 750m South mg/kg g/100g g/100g g/100g dry weight dry weight dry weight dry weight Average Maximum Average Maximum Average Maximum Average Maximum Average Maximum Average Maximum

68 Appendix K Report Peer Review Report Condition 24 PLACE HOLDER FOR THE PEER REVIEW REPORT 65

69 Appendix L Treated BTF Trend Analysis Data Condition 24(g) Notes for Data Interpretation The Mann-Kendall test (outlined below) was used to identify trend presence; if found to be present, the trend strength was then determined using the Theil Sen slope estimator. The significance level, p (probability) value, was set at alpha = 0.05 so all results from the Mann-Kendall trend analysis and Theil Sen assessment were considered statistically relevant if their associated two-sided p value was The analysis was carried out at the 95% Confidence lnterval. To compare direction and significance of trends, trend slopes and p-values of real and estimated trends in a time series segment were classified in six trend classes: - N3: significant decreasing trend (slope < 0 and p 0.05) - N2: non-significant decreasing trend (slope < 0 and 0.05 < p 0.1) - N1: no trend with decreasing tendency (slope < 0 and p > 0.1) - P1: no trend with increasing tendency (slope > 0 and p > 0.1) - P2: non-significant increasing trend (slope > 0 and 0.05 < p 0.1) - P3: significant increasing trend (slope > 0 and p 0.05). 66

70 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph BTF Treated Wastewater Total Suspended Solids Increasing Trend Unlikely BTF Treated Wastewater CBOD Not increasing or Decreasing i.e. no clear trend 67

71 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph BTF Treated Wastewater COD Increasing trend more likely than not BTF Treated Wastewater Total Oil and Grease Increasing trend extremely likely 68

72 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph Flow Increasing trend likely 69

73 Appendix M Final Combined Wastewater Loading Rates Trend Analysis Data Condition 24(g) Notes for Data Interpretation The Mann-Kendall test (outlined below) was used to identify trend presence; if found to be present, the trend strength was then determined using the Theil Sen slope estimator. The significance level, p (probability) value, was set at alpha = 0.05 so all results from the Mann-Kendall trend analysis and Theil Sen assessment were considered statistically relevant if their associated two-sided p value was The analysis was carried out at the 95% Confidence lnterval. To compare direction and significance of trends, trend slopes and p-values of real and estimated trends in a time series segment were classified in six trend classes: - N3: significant decreasing trend (slope < 0 and p 0.05) - N2: non-significant decreasing trend (slope < 0 and 0.05 < p 0.1) - N1: no trend with decreasing tendency (slope < 0 and p > 0.1) - P1: no trend with increasing tendency (slope > 0 and p > 0.1) - P2: non-significant increasing trend (slope > 0 and 0.05 < p 0.1) - P3: significant increasing trend (slope > 0 and p 0.05). 70

74 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph Total Suspended Solids Load (TSS) Decreasing Trend cbod Decreasing Trend Likely 71

75 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph COD Load Decreasing trend Total Oil and Grease Load (TOG) Decreasing trend 72

76 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph Acid Arsenic (Arsenic) Soluble Load Decreasing trend Acid Cadmium (Cadmium) Soluble Load Increasing trend about as likely as not 73

77 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph Acid Soluble Lead Load (Lead) Decreasing trend Acid Soluble Zinc Load (Zinc) Increasing trend unlikely 74

78 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph Acid Soluble Mercury Load (Mercury) Increasing trend about as likely as not Acid Soluble Chromium Load Increasing trend exceptional ly unlikely 75

79 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph Total Sulphide Load Decreasing trend unlikely Acid Soluble Copper Load Decreasing trend about as likely as not 76

80 Parameter/Analyte P-Value Z-Value Sen s Slope % Annual Change Trend Direction and Strength Trend Graph Acid Soluble Nickel Load Decreasing trend Acid Chromium Soluble Increasing trend about as likely as not 77

81 Appendix N Comparison Between the Receiving Water Sampling Sites 78

82 79

83 80

84 81