Annual report 2006-2007 - Taranaki Regional Council

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94 Most MCI scores were similar to historical median MCI scores, and higher SQMCIs scores than historical medians were recorded throughout the stream. There was some longitudinal deterioration throughout the catchment, a trend which is usually present in agricultural ringplain catchments due to non-point source discharges and is demonstrated by decreasing median MCI and SQMCIs scores in a downstream direction from past surveys. Taranaki ringplain streams’ communities have been shown to decrease in MCI scores at an average rate of 2.6 MCI units/km along their total length, probably at a higher rate than this toward the upper reaches. This would equate to a theoretical drop in MCI of about 21 units over the length of the Kahouri Stream surveyed. The current survey recorded a decrease of 23 units, a rate of 2.9 MCI units/km. This is higher than what has been recorded in previous surveys, which attributed a lack of a significant trend to the moderation of algae growth due to good riparian vegetation cover along the banks of the Kahouri Stream in the reach monitored. The trend seen in this survey is largely the result of an above average community at the top site, coupled with a below average community at the downstream site. 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. Generally these April 2007 results suggested that the Kahouri Stream was in good ‘health’ compared with past monitoring years, throughout the 8 km reach surveyed. Any changes in macroinvertebrate community composition with distance downstream were not indicative of any significant decline in water quality and therefore reflected no recent impacts of point-source discharges in this part of the catchment. There is some indication of impacts from the Taranaki Abattoirs site, and therefore it is recommended to increase the scope of following surveys, to include impacts of this site on their unnamed tributary. The lower unnamed tributary did not have any detectable effect on the macroinvertebrate fauna downstream of its confluence with the Kahouri Stream. There is a need to maintain monitoring in the catchment, given its value as a trout fishery and the potential for impacts to occur. This residual level of monitoring is also being required by the Council elsewhere in the region where industry is concentrated.
11. Air quality in the Kahouri catchment 95 The Kahouri catchment monitoring programme addresses the discharge to air of emissions from three industries, being an abattoir, a tannery and a zinc galvanising plant. Resource consents for these discharges have been required because of their potential for adverse effect on the neighbourhood or environment (emissions from the Stratford power stations are covered under separate programmes). Many other factors influence air quality in the catchment, including a range of farming activities, and roads and highways. In addition to this, occasionally complaints are received regarding dust emanating from sites within the catchment. This highlights the potential for dust to be a contributing factor to air quality in the Kahouri Catchment. During the 2006-2007 monitoring period, the Council received six complaints about air quality in the Kahouri catchment, five relating to the activities of Taranaki Abattoirs and one regarding Egmont Tanneries. This is a significant decrease from the 25 complaints received in the previous monitoring period, and the 18 received in the period before that. This is primarily a reflection of the improved management at the abattoir, with better controls around the receiving and processing of product for rendering. The abattoir did receive one infringement notice however, for the discharge of offensive odour. No effect of discharges from galvanising plant was detected at or beyond the boundaries of those premises at the times of inspection and no complaints were received in the monitoring year under review.
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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
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24 In comparing the results (upstre
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26 Biological survey The Council’
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SQMCIs Value 7 6 5 4 3 2 1 0 A C E
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2.6 Discussion 2.6.1 Discussion of
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Table 7 Summary of performance for
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34 Condition requirement Means of m
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36 1. THAT monitoring of air emissi
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3. Taranaki Galvanizers 3.1 Process
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Special condition 4 defines the mix
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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 74 and 75: Table 19 Summary of performance for
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 82 and 83: Table 22 Summary of performance for
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 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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