Annual report 2006-2007 - Taranaki Regional Council

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74 7. Contact Energy Limited (CCPS) 7.1 Process description Contact Energy Ltd (previously Stratford Power Limited) holds resource consents to provide for the operation of a 354MW combined cycle power station (CCPS) that is situated on the northern bank of the Kahouri Stream, off State Highway 43, 2 km east of Stratford. The plant was formally commissioned on 6 July 1998. Five of those consents relate to activities in the Kahouri Stream catchment, being discharge of stormwater, emplacement of structures (3), and disposal of treated sewage by land soakage. Most of the resource consent monitoring associated with the combined cycle plant and reported on by Council, is carried out under a separate and comprehensive programme specific to that plant. Monitoring associated with activities that may affect the Kahouri Stream are detailed in this report. The drainage system for the station is constructed so that all stormwater from process and potentially contaminated areas drains to the wastewater treatment system. The treated wastewater is discharged to the Patea River, not to the Kahouri Stream. Stormwater is collected in a storage basin that is lined with rubber. For most of the time, the stormwater is pumped to the raw water holding pond for use in the plant. At times of heavy or prolonged rainfall, the stormwater pond overflows to the flooding Kahouri Stream. Occasionally, some of the contents of the raw water pond, comprising water drawn from the Patea River, have been pumped via the stormwater pond to the Kahouri Stream in an effort to reduce the amount of algae in the raw water pond. 7.2 Resource consents Contact Energy holds several consents in relation to the operation of a combinedcycle power station. Five of those consents relate to activities in the Kahouri catchment that potentially may have effects on the results of monitoring of other industry under the Kahouri Stream monitoring programme. The remaining consents held by Contact Energy relate to abstraction from the Patea River, discharge of treated wastewater to the Patea River and discharge of emissions to air. Monitoring in respect of these latter described consents is reported on separately by the Council. 7.2.1 Water discharge permit Section 15(1)(a) of the Resource Management Act stipulates that no person may discharge any contaminant into water, unless the activity is expressly allowed for by a resource consent or a rule in a regional plan, or by national regulations. Contact Energy Limited holds water discharge permit 4459 to discharge stormwater from a combined cycle power station site, including stormwater and sediment from construction activities associated with the proposed expansion of the site, into an
75 unnamed tributary of the Piakau Stream and into the Kahouri Stream. This permit was issued by the Taranaki Regional Council on 25 May 1994 under Section 87(e) of the Resource Management Act. It expires on 1 June 2028. Special conditions 1 and 3 define discharge contaminant limits and the effects that shall not be observed in the receiving water below a 5 metre mixing zone. Special condition 2 requires that the consent holder provide a contingency plan. Special condition 4 defines the lapse period if the consent is not exercised and condition 5 is a review condition. The permit is attached to this report in Appendix I. 7.2.2 Discharges of wastes to land Sections 15(1)(b) and (d) of the Resource Management Act stipulate that no person may discharge any contaminant onto land if it may then enter water, or from any industrial or trade premises onto land under any circumstances, unless the activity is expressly allowed for by a resource consent, a rule in a regional plan, or by national regulations. Contact Energy Limited holds discharge permit 5063 to cover the discharge of domestic septic tank effluent through a soakage field onto and into land in the vicinity of the Kahouri Stream. This permit was issued by the Taranaki Regional Council on 16 December 1997 under Section 87(e) of the Resource Management Act. It is due to expire on 1 June 2028. Special condition 1 requires the septic tank and field soakage effluent treatment system to be installed according to plans submitted with the application. Special condition 2 states that the discharge shall not enter a surface water body. Special condition 3 is a review condition. The permit is attached to this report in Appendix I. 7.3 Monitoring programme The monitoring programme for Contact Energy Ltd consisted of two primary components in addition to programme liaison and management. 7.3.1 Site inspections The Contact site was visited four times during the monitoring period. With regard to consents for the discharge to stormwater and septic tank discharges, the main points of interest were plant processes with potential or actual discharges to receiving watercourses. The neighbourhood was surveyed for environmental effects.
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Kahouri Stream Monitoring Programme
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Six complaints, which were logged a
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ii 2.7 Recommendations 37 3. Tarana
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iv 6.6.4 Recommendations from the 2
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vi List of tables Table 1 Resource
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Figure 6 Biological oxygen demand (
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Section 11 presents recommendations
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1.2.1 Other resource consents A tot
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Figure 1 Biological and chemical mo
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2. Taranaki Abattoir Co (1992) Limi
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10 Waste liquor and floor washings
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2.2.2 Water discharge permit 12 Sec
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24 March 2005, under Section 87(e)
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16 plant staff were made aware of t
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18 inspection, staff also outlined
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Dissolved oxygen (g/m 3 ) 35 30 25
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Dissolved Reactive Phosphorus (g/m3
Page 38 and 39: 24 In comparing the results (upstre
Page 40 and 41: 26 Biological survey The Council’
Page 42 and 43: SQMCIs Value 7 6 5 4 3 2 1 0 A C E
Page 44 and 45: 2.6 Discussion 2.6.1 Discussion of
Page 46 and 47: Table 7 Summary of performance for
Page 48 and 49: 34 Condition requirement Means of m
Page 50 and 51: 36 1. THAT monitoring of air emissi
Page 52 and 53: 3. Taranaki Galvanizers 3.1 Process
Page 54 and 55: Special condition 4 defines the mix
Page 56 and 57: 42 underneath the galvanising plant
Page 58 and 59: NH 4 -N (g/m 3 ) 44 Ammoniacal nitr
Page 60 and 61: 3.4.2 Air 46 Air monitoring in the
Page 62 and 63: 48 Table 14 Summary of performance
Page 64 and 65: 4. Egmont Tanneries Limited 4.1 Pro
Page 66 and 67: permit was issued by the Taranaki R
Page 68 and 69: 54 An additional inspection was und
Page 70 and 71: 56 Table 16 Results of summer low-f
Page 72 and 73: 58 In the 2006-2007 year, there was
Page 76 and 77: 62 In the case of Egmont Tanneries,
Page 78 and 79: 5.3 Monitoring programme The monito
Page 80 and 81: 66 Water chemistry The chemical wat
Page 84 and 85: 6. Contact Energy Limited (closed p
Page 86 and 87: 72 not suggest that discharges from
Page 90 and 91: 7.3.2 Biomonitoring surveys 76 One
Page 92 and 93: 78 Condition requirement Means of m
Page 94 and 95: 8. Fletcher Concrete & Infrastructu
Page 96 and 97: 8.3.2 Chemical sampling 82 The Tara
Page 98 and 99: 84 The stream at this site had a cl
Page 100 and 101: 8.6.5 Alterations to monitoring pro
Page 102 and 103: 88 what effects the discharge shall
Page 104 and 105: 90 Incidents may be alleged to be a
Page 106 and 107: 10. Water quality in the Kahouri ca
Page 108 and 109: 94 Most MCI scores were similar to
Page 110 and 111: 96 12. Summary of recommendations 1
Page 112 and 113: NH3 unionised ammonia, normally exp
Page 115: Appendix I Resource consents held b
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To Job Manager, B Jansma From Scien
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Figure 1 Biomonitoring sites in the
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Table 3 Macroinvertebrate fauna of
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MCI value 140 120 100 80 60 40 20 0
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Site E: Kahouri Stream (KHI000400)
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mayflies, elmid beetles, Archichaul
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Further downstream at Flint Road, t
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Annual report 2006-2007 - Taranaki Regional Council

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