Table 11.1 A New Zealand model for on-site inspection
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| Inspection level |
Application |
Inspection procedures |
| Class 1 (low level, 5–10- year intervals) |
- remote area recreational facilities
- farmhouses
- lifestyle blocks (on large lots > 2 ha)
- rural/residential dwellings (> 4000 m2)
- where significant clearances are available to property boundaries
(50 m or more)
- where an established history of good environmental performance
exists
- where environmental, public health and economic consequences of
poor performances are considered insignificant.
|
Class 1 low-level inspections may involve a check on
the septic tank and/or other pre-treatment unit sludge and scum levels,
and a visual inspection of the general location of the land application
area and on-site system environment. |
| Class II (intermediate level, 3–5 years) |
- rural/residential subdivisions of less than 5 lots
- rural/residential subdivisions on medium- sized lots (> 1,000m2
- urban dwellings on medium-sized lots (> 1000m2
- isolated rural dwellings on lots > 800 m2
- where the site coverage allows ample room for providing a replacement
system to modern design standards
- where seasonal occupancy is the norm (ie, holiday resort areas)
- where overall performance of local systems is judged satisfactory
|
Class II intermediate-level inspections may involve (in
addition to the low-level assessment) the search of building consent
records, distribution system inspections, probing to locate soakage
field elements, full sketch plans of site and on-site system elements,
general soil assessment, and overall environmental performance review. |
| Class III (high level, 1–3 years) |
- rural/residential subdivisions of more than 5 lots
- rural/residential subdivisions on smaller lots (< 1000 m2)
- isolated rural residential dwellings on smaller size lots (less
than 800m2)
- urban area dwellings in smaller lot sizes (< 1000 m2)
- where site coverage results in restricted room for a replacement
system to modern design standards
- where permanent occupancy is the norm in rural residential areas
- where overall performance of local systems is judged unsatisfactory
- where a high level of failures of existing systems is evident
(> than 20% of systems are affected)
- where potential environmental and public health effects are judged
to be significant.
|
Class III high-level inspections may involve (in addition
to intermediate assessment): emptying pre-treatment units via pump-outs
of septage and then evaluating the physical condition of the unit; excavating
elements of the land application system/ area to assess liquid retention
and current operational capability; undertaking detailed solid profile
determination and soil category assessment to confirm design suitability;
sampling and analysing pre-treatment effluent quality; and undertaking
environmental effects assessment (including groundwater and surface
water monitoring within and beyond the site, as well as checking soil
condition and plant health in the vicinity). |
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