relatively constant across the 4 years that the study spanned. Further details on the air quality categories
recorded for each year are given in Table 4 and Figure 11.
page
15
Table 4 Categorisation of results into environmental performance indicator air quality categories
Category
Category
values
(µg/m3)
# Days in Category (%)
Complete
Period 2016 2017 2018 2019 2020
Excellent <2.5 283 (19%) 58 (19%) 70 (20%) 74 (21%) 53 (14%) 28
Good 2.5 – 8.3 …
<0.0010 < 0.0010 <0.0010
page
11
* no sample due to insufficient flow
Table 5 Chemical analysis of the Awai Stream tributaries sites on 16 March 2022
Parameter Unit
AWY000103* AWY000105 AWY000107 AWY000100 AWY000115
30 m d/s of
landfill
(culvert
discharge)
130 m d/s of
landfill
400 m d/s
landfill face
u/s of
confluence of
landfill trib
d/s of
confluence
of landfill trib
Alkalinity g/m3
CaCO3 - 110 67 22 53
BOD g/m3 - 2 <2
62 9 86 22
Dissolved
carbonaceous
BOD (g/m3)
5.0 6.5 6.1 7.4 5.8 5.8 6.0 60 < 2 87 10
Oil and grease
(g/m3)
< 6 < 4 6 <7 <6 11 < 6 51 < 0.5 430 <5
Total
Ammoniacal N
(g/m3)
24 29 32 53 35 31 32 58 4.6 75 35
Total N (g/m3) 36 34 35 61 48 57 42 62 21 92 46
Total P (g/m3) 6.8 8.1 9.1 13.6 12.9 13.6 11 62 4.2 21 8.7
Temp. °C 11.2 13.1 19.2 20.7 19.2 11.9 16.0 91 7.6 23.8 16.1
Conductivity @
25°C (µS/cm)
683 705 683 992 880 899 793 92 474 1,400 816
M
ed
ian
11:30 11:40 10:15 10:20 11:50 11:45
Total BOD
(g/m3)
128 29 16 65 32 33 33 52 < 6 330 51
Total
carbonaceous
BOD (g/m3)
16 16 22 65 23 21 22 55 9 86 22
Dissolved
carbonaceous
BOD (g/m3)
3.9 5.9 8 16 8 6 7 53 < 2 87 10
Oil and grease
(g/m3)
< 8 < 10 < 7 9 10 < 4 < 10 45 < 5 430 5
Total
Ammoniacal
N (g/m3)
26 27 35 15.1 40 55 31 51 4.6 74.8 35.5
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11
Parameter
Sample date and time (2019-2020) Summary …
injection
pressure
(bar)
Avg. injection
pressure D2H
(bar)
Avg.
injection
pressure
D4HST2
(bar)
2018-2019 6,646 146 53 14 23
2017-2018 31,168 177 50 33 38
2016-2017 12,164 116 45 26 26
2015-2016 19,276 198 39 23 22
2014-2015 11,310 133 39 17 17
2013-2014 20,827 146 40 31 31
2012-2013 23,677 144 41 21 17
Note * Consent conditions were updated 18 December 2018 and limits were removed
Table 10 Summary of injection activity under Consents
Conductivity mS/m 30.4 30.3
Hydrocarbons g/m³ < 0.5 < 0.5
pH pH 7.8 7.9
Suspended solids g/m³ 45 53
The results indicate that the discharge was having negligible effect on the water quality
of the tributary of the Manawapou River and was in compliance with all applicable
consent conditions at the time of sampling.
2.2 Air
2.2.1 Inspections
Air inspections were carried out in conjunction with site inspections as discussed in
section 2.1.1 above. No issues regarding air
Executive Audit and Risk Agenda March 2023
Stratford District Council landfills consent monitoring report - Taranaki Regional Council.
Stratford DC landfills consent monitoring report - Taranaki Regional Council.
water balance assessment 53
3.3 Diversion from Manganui River 54
3.3.1 Intake headworks 54
3.3.2 Fish pass flows 57
3.3.3 Motukawa Race flows 58
3.3.4 Pumping from Mangaotea Stream 60
3.4 Lake Ratapiko 61
3.4.1 General description 61
3.4.2 Lake level fluctuations 62
3.4.3 Lake level duration and seasonality 64
3.4.4 Flood management 65
3.4.5 Spill flow and residual flow 66
3.5 Motukawa power station 68
3.5.1 Power station flows 68
3.5.2 Daily flow ramping 68
3.6 Scheme inflows and