Inventering av provtagningsstrategier för jord ... - Naturvårdsverket

HÅLLBAR SANERING
Rapport 5894 – Inventering av provtagningsstrategier för jord, grundvatten och porgas
The inventory of the experience based on work done in the USA constitutes a
huge volume in this report. The most distinct differences between Swedish and
USEPA guideline documents is that the American recommendations are of more
stringent and formal character (sampling design is integrated into Data Quality
Objective Process) compared to Swedish references (Quality Manual for Follow-up
Treatment of Contaminated Land and MIFO methodology).
In this report, eight different sampling strategies are summarized along with
their pros and cons and under what circumstances those (strategies) work best. Two
relatively innovative strategies are presented: Ranked set sampling and adaptive
cluster sampling. The main conclusions from the American inventory are:
• Sampling design should be planned parallel with following its contextual
connection with other parts included in a process of environmental
assessment (also risk assessment) of a contaminated site.
• The choice of an appropriate strategy is always site-specific and depends
on the objectives with data collection.
• There is often a need to consider more that only one strategy for a site.
• Collected data and interpretation are always subject to uncertainties –
because data uncertainty influence quality of information used in the
following decision process, they are to be quantified and communicated
to the problem owner/decision maker in a transparent manner.
• In some situations, integration of screening methods and traditional
sampling will result in higher data quality at lower cost compared to
situation where exclusively traditional sampling and laboratory analysis
are applied.
This report also presents short descriptions of PC-platform tools for planning of
sampling design (Visual Sampling Plan) and data analysis, quantification of
uncertainties and visualization (Spatial analysis and Decision Assistance).
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