Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1850:p102
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1850 (pt 102/117)
Character Range: 652119–655176

conditions and access restrictions
    * the possible content of a problem statement that gives a brief summary of the contamination issue(s) at the site that is to be addressed in the project
    * the reason the project is being undertaken
    * identification of the project team and technical support experts, such as field manager/site supervisor, field personnel, toxicologists, risk assessors and statisticians
    * budget and community concern issues that may also be factors in designing and carrying out the environmental assessment
    * identification of the regulatory authority(ies) and the local government area.

Step 1 of the DQO process should assist in developing the following:
    * a concise description of the problem
    * a list of the planning team members and identification of decision-maker
    * a summary of available resources and relevant deadlines for the study
    * a preliminary conceptual model of the site, based on available information prior to the commencement of the site investigation, covering:
  -       previous investigations
  -       present and historical use(s) of the site and adjacent sites
  -       geology, hydrogeology
  -       potential contaminants of concern
    -       potential contaminant migration pathways both to and from the site (such as waterways, drains, service conduits)
  -       areas of environmental concern (drawings showing chemical storage, use, disposal)
    -       media in which potential contaminants of concern may be present and through which they may migrate (habitat(s) of contamination, lateral and depth extent, temporal and climatic variability)
    -       potential exposure pathways to human and/or environmental receptors
    -       future land uses.

The conceptual model of contamination of the site that is produced at this early point can be progressively refined through subsequent stages of the assessment.

    18.2.2      Step 2: Identify the decisions/goal of the study
The second step involves identifying the decisions that need to be made about the contamination problem and the new environmental data required to make them.

The objective(s) of the data collection part of the investigation is project-specific and may be identified by:
    * referring to the history of use of the site, chemicals of concern and likely concentration range(s), media that may be impacted and likely migration routes, such as groundwater, surface water flow, wind, and service trenches
    * considering relevant site criteria for each medium (fill, soil, sediment, groundwater, surface water, air)
    * making a series of decision statements that need to be addressed (e.g. a decision statement could consider whether parts of the site would be suitable for a proposed use if the 95% UCL on the mean concentrations for all chemicals of potential concern were less than the appropriate site criteria).
Step 2 of the DQO process should assist in developing a decision statement linking the principal project objective(s) to the possible actions that will address