ISO 12404-2021 pdf download

ISO 12404-2021 pdf download.Soil and waste – Guidance on the selection and application of screening methods. 6.2 Data quality objectives (DQOs) NOTE The data quality objectives (DQOs) process refers to a systematic planning procedure for environmental data collection so that the data can be defensibly interpreted, and statistically analysed where appropriate, to address specified objectives. It includes appropriate sampling design and sampling plans, as well as the analytical strategy and setting analytical data objectivesRJJ. The concept applies not just to numerical data, but also to the sufficiency of all relevant information in terms of quantity, quality and type. In land contamination investigations, there are typically DQOs that require laboratory analytical data to be meaningfully comparable to a variety of risk-based or other quality criteria. DQOs should be set [or all investigations. They should be defined for the specific purpose of the site investigation phase or activity, e.g. risk-based assessment (human health and controlled waters), remediation, validation or waste classification. When setting DQOs, account should be taken of the type, quantity and quality of the data required to inform subsequent decisions based on the data and other available information. L)QOs should be set having regard to QA/QC (Quality Assurance/Control) requirements and how comparison with risk-based or other criteria is to be effectively supported by the site data and information as well as the laboratory analytical data collected. Review points should be identified at key stages throughout the investigation, assessment and remediation design phases to ensure that DQOs remain aligned to the project requirements. The review should include assessment of the continuing validity of the conceptual site model, data consistency, emerging data gaps and levels of uncertainty. A written record of the review should be maintained and incorporated in the assessment and design process and include a statement on whether the DQOs have been met and any shortfalls within the assessment. 6.3 SelectIon criteria 6.3.1 General The following criteria should be taken into consideration when selecting the appropriate screening method. The different criteria should be weighted depending on the intended application. The decision-making process and the results should be documented by the user (see flowchart in Annex.C and documentation aid in Annex D). Prerequisites are: — one known parameter or a set of known parameters; — aim of determination; — matrix (soil, soil-like materials, solid or liquid waste). Whenever a sample is collected from waste, the sample source of waste is obvious....