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Draft Policy for Assessing & Managing Contaminants in soil: a progress report
WMINZ Conference, 15 October 2009
James Court and Howard EllisMinistry for the Environment
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• NZ risk-based methodology to derive soil guideline values levels protective of human health;
• Determine good practice district plan provisions requiring appropriate risk management actions
• national environmental standard or guidelines
New policy initiatives on managing contaminants in soil
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Environment protected (human health, ecological and all beneficial uses)
Good quality land maintained
Fit for purpose land (maximising safe human use)
Land affected by hazardous substances managed/remediated to
the extent practicable
Human health protected
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[Section 31 of the RMA]:
“the prevention or mitigation of any adverse effects of the development, subdivision, or use of contaminated land.”
Good practice district plan policies and rules
Why high priority?
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Contaminated land provisions in district plans
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No
Restricted discretionary
activityYes
Proposed subdivision, development, land-use change
reports, RAP,
mgt plan to council
Permitted Activity
on HAIL list?
on HAIL list?
site investigation
SGV exceeded?
SGV exceeded?
Assess site?
Assess site?
No
No
reports to council
Preliminary investigation
Step 1
Step 2
Step 3
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use experienced and qualified professionals for site reports and audits RAP and/or risk management plan are subject to resource consent conditions waste tracking system to ensure contaminated soil is safely transported to correct and authorised destination off-site
Other requirements
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Con
tamin
ant C
oncen
tration –
Increasin
g level of risk
Risk of chronic exposure
Risk of acute exposure
Negligible risk of exposure
SGV(health)
Significant adverse effects are reasonably likely
Risk that adverse effects will occur
Any adverse effects are no more than minor
(Risk is acceptable)
Toxicological risk RMA effects thresholds
Risk is unacceptable
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SGVs(health) are for protecting human health
Land </= SGV(health) is safe for human use
Land > SGV(health) is to be remediated and/or managed
the national benchmark
not “pollute up to” levels.
not for assessing agricultural land per se
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Can modify SGVs(health) on a site-specific basis as per guidance (Tier 2) if exposure is different from scenarios provided
1. Rural residential/lifestyle (10% produce) 2. Rural residential/lifestyle (50% produce) NON REG3. Residential (10% produce) 4. High density residential (no produce)5. Parks/Recreation6. Commercial/industrial outdoor worker
SGVs for regulatory purposes:Land use scenarios (fruit and vegetable consumption)
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SGV(health) derived for As, Cd, Cu, Cr (III, VI), Pb,
Hg, B, BaP, DDTs, dieldrin, PCP, dioxin/furans, PCBs
SGV derivation methodology fully documented
Petroleum hydrocarbons (during 2010)
If no SGV(health) then look to CLMG No. 2
If background > SGV(health) then risk is more than
minor and may need to be managed
SGVs(health for regulatory purposes
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Environmental effects
assess on a site by site basis,
use conceptual site model to identify:
ecological effects
effects on surface water, groundwater – including human
drinking water sources
impacts on amenity values
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How will everything fit together?
Riskscreening
Investigatingsites
Classifyingsites
Sheepdips
Timbertreatment
PetroleumGasworks
Analysingsoils
SGVs
TA Policies & Rules
Reporting
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Analysingsoils
How will everything fit together?
Riskscreening
Investigatingsites Classifying
sites
Sheepdips
Timbertreatment
PetroleumGasworks
SGVs
District Policies & Rules
Reporting
NES
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Tentative timetable (NES)
Discussion document Nov 09
Submissions period to Mar ‘10
Submissions report April ‘10
Proposal to Minister June ‘10
If Cabinet approves Aug ‘10 Legal drafting Sep ‘10 Regulation as NES Nov ‘10
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Information management
Local authorities are to maintain compatible
databases to record and exchange information
concerning contaminant in soil …
An information management system shared between regional councils and territorial authorities and made accessible to those who need to make informed decisions about affected land is fundamental to achieving the effective and efficient public administration of land affected by soil contaminants.
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Risk Management
Remediation
regulatory
source
control
Containment
regulatory
exposure pathway control
Behaviour
non regulatoryreceptor control