Annual report 2006-2007 - Taranaki Regional Council

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56 Table 16 Results of summer low-flow chemical water survey in a tributary of the Kahouri Stream in relation to Egmont Tanneries, 18 April 2007 (TRC site code KHI000369) Date Temp (°C) Cond @ 20°C (mS/m) pH Acid soluble Chromium (g/m 3 ) Dissolved Zinc (g/m 3 ) Ammoniacal- N (g/m 3 N) Ammonia NH3 (g/m 3 ) SS (g/m 3 ) 18 April 2007 11.9 11.9 7.4
57 The stream at this site had a cloudy flow, with substrate comprising hard clay and tree roots. Prior to the survey there was a reasonable period of flow recession, being 93 days since a flood in excess of 3 times median flow had occurred. Site D in the Kahouri Stream tributary would be expected to support ‘poorer’ macroinvertebrate communities than those of the Kahouri Stream due to the clay substrate, but in this survey the community contained many ‘sensitive’ taxa and had relatively high MCI and SQMCIs scores, indicating no detrimental effects from discharges in the Stratford industrial area in the upper part of the tributary which includes discharges from Taranaki Galvanizers, Egmont Tanneries and Firth Industries. A full biological report is given in Appendix II. 4.4.2 Air 4.4.2.1 Results of air monitoring At the time of each inspection, particular attention was given to odour, and/or any potential sources of odour, and if necessary, an odour survey was conducted at five sites in the vicinity of the property. Determination was made of the intensity, characteristics and possible causes of any odour. Localised odours were noted on occasions during the inspections of the site. However no off-site odours were detected on these occasions. Samples were taken from the last holding tank in the effluent settling tanks during the compliance monitoring inspection and analysed for pH and sulphide to determine the potential for odour. Sulphides cause odours that in the past have penetrated into buildings from the municipal sewerage. Because hydrogen sulphide is a weak acid, as the pH drops, more sulphide is present as hydrogen sulphide. This is the form in which it is free to transfer to the atmosphere as hydrogen sulphide gas, which is odorous. Sulphide concentrations were low in the sample taken. 4.5 Register of incidents The Taranaki Regional Council operates and maintains a register of all complaints or reported and discovered excursions from acceptable limits and practices, including non-compliance with consents, which may damage the environment. The register (‘unauthorised incident register’) includes events where the company concerned has itself notified the Council. The register contains details of any investigation and corrective action taken. Incidents may be alleged to be associated with a particular site. If there is an issue of legal liability, the Council must be able to prove by investigation that the identified company is indeed the source of the incident (or that the allegation cannot be proven).
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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
Page 20 and 21: Figure 1 Biological and chemical mo
Page 22 and 23: 2. Taranaki Abattoir Co (1992) Limi
Page 24 and 25: 10 Waste liquor and floor washings
Page 26 and 27: 2.2.2 Water discharge permit 12 Sec
Page 28 and 29: 24 March 2005, under Section 87(e)
Page 30 and 31: 16 plant staff were made aware of t
Page 32 and 33: 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 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 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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