Annual report 2006-2007 - Taranaki Regional Council

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6. Contact Energy Limited (closed power station) 6.1 Process description 70 Contact Energy Limited owns a site previously used for a 200 MW gas-fired thermal power station beside the Kahouri Stream, 2 km east of Stratford on State Highway 43. The station was closed indefinitely in October 1999, and between June and August of 2001, Fitzroy Engineering Group Limited dismantled the power station for shipping overseas. Stormwater from the site discharges to the Kahouri Stream and one of its tributaries. There is an oil separator in the stormwater drain above each discharge point. 6.2 Resource consents 6.2.1 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 3939 to discharge stormwater from Stratford Power Station to the Kahouri Stream and an unnamed tributary. This permit was issued by the Taranaki Regional Council on 28 January 2000 under Section 87(e) of the Resource Management Act. It expires on 1 June 2016. The first two special conditions define the effects that shall not be observed in the Kahouri Stream below the 50 metre mixing zone, and discharge contaminant limits. The third condition requires that the consent holder shall only discharge stormwater in accordance with documentation submitted in support of the consent, and condition 4 is a review condition. 6.3 Monitoring programme The monitoring programme for Contact Energy consisted of three primary components in addition to programme liaison and management. 6.3.1 Site inspections The Contact site was not visited during the monitoring period, as per the recommendation in the 2005-2006 report. Previous inspections conducted with regard to consents for the discharge to stormwater, concentrated on plant processes with potential or actual discharges to receiving watercourses. The neighbourhood was surveyed for environmental effects. 6.3.2 Chemical sampling The Taranaki Regional Council undertook sampling of the water quality upstream and downstream of the discharge point and mixing zone (sites 7 and 10, Figure 1) on one occasion during the monitoring year in conjunction with the low flow survey.
71 The summer low flow survey of water quality in the Kahouri catchment is a shared survey between several industries. In relation to Contact Energy, Sites 7 (Flint Rd) and 10 (above Piakau confluence) were sampled, and analysed for conductivity, pH, turbidity, suspended solids, ammonia, nitrate, dissolved reactive phosphorus and E. coli bacteria (Table 2). 6.3.3 Biomonitoring surveys One shared biological survey was performed in seven sites in the Kahouri Stream catchment on 17 April 2007 to determine whether or not the discharges from the various industries had had a detrimental effect upon the communities of the stream. The location of these sites is shown in Table 2. When assessing the effects of the Contact Energy discharge, site F (in the Kahouri Stream, upstream of the discharge) and G (in the Kahouri Stream, 80 m downstream of the discharge) were used to assess the effects of the discharge on the biological communities of the stream. 6.4 Results 6.4.1 Water 6.4.1.1 Inspections No inspections were carried out in the 2006-2007 monitoring period, as per the recommendation in the previous report. A contingency plan for the site has not been provided to the Council to date. 6.4.1.2 Results of discharge monitoring No specific water quality monitoring is carried out in connection with the power station site. 6.4.1.3 Results of receiving water monitoring Water chemistry The chemical water quality survey for the summer low-flow period was performed on 18 April 2007. Monitoring sites in the Kahouri Stream were located 2.5 km above the power station, at Flint Road bridge (site 7, Figure 1), and 1.2 km downstream of the power station, above the confluence with the Piakau Stream (site 9, Figure 1). As this site only discharges stormwater, it is unlikely that a discharge was taking place at the time of this survey. For most of the parameters the value measured downstream of the discharge was less than that measured upstream. The counts of E. coli and faecal coliforms were lower at the downstream site than upstream site, with water quality monitoring as a whole showing an improvement over this 3.6 km reach (Table 21). Biological survey Macroinvertebrate communities were sampled from one site upstream and one site downstream of the Stratford Power Station discharge to the Kahouri Stream (sites F and G, Figure 1) on 17 April 2007. The results are discussed in Section 5.4.1.3 and do
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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
Page 34 and 35: Dissolved oxygen (g/m 3 ) 35 30 25
Page 36 and 37: 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 86 and 87: 72 not suggest that discharges from
Page 88 and 89: 74 7. Contact Energy Limited (CCPS)
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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