wide, and is shown in Figure 2.
Patea Beach is an elevated site which for most of the time is dry. Rain that does fall on the site drains away
at a very rapid rate. The site does not suffer from flooding from rain or tidal action, due to its elevation.
Monitoring over the past four years noted no discharge of leachate or liquids from the base of the dune as
a result of the discharge.
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4
Figure 1 Regional map showing the location of the Patea green waste site
figure of 43mm of
rainfall per hour will be utilised. This is a very conservative figure as values for the top 30 rain
occurrences range from 8.0 to 15mm with the average being 9.4mm (refer Table 2).
Runoff of the falling rain will be influenced by the site’s runoff coefficient. This has been calculated
to be 0.25 as per MBIE Verification Method E1/VM1 (1 January 2017). Remediation (NZ) Ltd
considers this coefficient to be a conservative runoff coefficient as the composting
figure
of 43mm of rainfall per hour will be utilised. This is a very conservative figure as values for the top 30
rain occurrences range from 8.0 to 15mm with the average being 9.4mm (refer Table 2).
Runoff of the falling rain will be influenced by the site’s runoff coefficient. This has been calculated
to be 0.25 as per MBIE Verification Method E1/VM1 (1 January 2017). Remediation (NZ) Ltd
considers this coefficient to be a conservative runoff coefficient as the composting
undertaken on 24 October 2018 47
Table 10 Results of metal analysis undertaken on 6 May 2019 48
Table 11 Results of rain event monitoring – discharge and Puremu Stream samples, 18 September
2018 51
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iii
Table 12 Results of rain event monitoring - Manganaha Stream, 18 September 2018 51
Table 13 Biomonitoring sites in the Puremu and Manganaha Streams related to the Colson Road
landfill 52
Table 14 Chemical analysis of Colson Road landfill groundwater sampled
out during fine weather following a period of heavy rain throughout the
catchment. The influent screen was operating and wastes were fully contained. The main pond was dark
green with a slightly turbid appearance. No odours were noted. Approximately 50 birds were present, the
majority of which were mallard and teal ducks.
Both wetland pond levels were normal. These were green/brown in colour and slightly turbid. The wetland
sump pump was operating at the time of inspection. No surface
Again odour was
very minimal. No visual environmental impacts downstream of the discharge point to the Tawhiti Stream
observed at any time during the financial year.
Effluent collection points within piggery viewed during all inspections. Found to be in good condition, with
no signs of spills or overflows even after heavy prolonged rain periods. Bunding functioning well. During the
8th May inspection a burst underground effluent pipe between the southern sheds was brought to the
attention
the NPS-
FM objective. Given that the Council can only consider policies that relate to the matters over which the
Council has reserved control through the plan itself, the Council is unable to take into account matters that
fall outside this scope.
You will be aware that, with few exceptions, when a dairy consent involving a discharge to water is replaced,
the Council only allows the water discharge to continue until 1 December 2022, then the only discharge
allowed is to land.
The cleanfill was inspected during fine weather. It had rained in the days preceding. There were no dust or
odour issues and the inspecting officer noted that the site appeared to be tidy. The majority of the
consented cleanfill area appeared to have been reinstated into paddock or was used for storage. Some
material had been recently deposited at the cleanfill, but a visual inspection confirmed that there was no
prohibited material. The material had originated from the site itself. A
4. Company to isolate washwater
from stormwater unless due to
heavy rain events
Inspections of treatment site Yes
5. Location of discharge point Inspections of treatment system and discharge
point Yes
6. Company to adopt best
practicable option
Inspections of treatment system and discharge
point, liaison with Council, sampling of
discharge and receiving waters
Yes
7. Limits quarry catchment area Inspections Yes
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15
Purpose: To discharge