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1 of 36 The EPA 7-Step DQO Process Step 2 - Identify the Decisions Presenter: Sebastian Tindall 9:30 AM - 9:45 AM (15 minutes) Day 2 DQO Training Course.

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Presentation on theme: "1 of 36 The EPA 7-Step DQO Process Step 2 - Identify the Decisions Presenter: Sebastian Tindall 9:30 AM - 9:45 AM (15 minutes) Day 2 DQO Training Course."— Presentation transcript:

1 1 of 36 The EPA 7-Step DQO Process Step 2 - Identify the Decisions Presenter: Sebastian Tindall 9:30 AM - 9:45 AM (15 minutes) Day 2 DQO Training Course Module 3

2 2 of 36 Terminal Course Objective To be able to develop principal study questions, alternative actions, assess potential errors and their consequences and the severity of the consequence of the error

3 3 of 36 Step Objective: Develop decision statements that require environmental data to address the objective of the problem statement Step 2: Identify Decisions Step 4: Specify Boundaries Step 2: Identify Decisions Step 3: Identify Inputs Step 1: State the Problem Step 5: Define Decision Rules Step 6 : Specify Error Tolerances Step 7 : Optimize Sample Design

4 4 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences

5 5 of 36 Background Principal Study Question: PSQ Alternative Action: AA The PSQ identifies key unknown conditions or unresolved issues that reveal the solution to the Problem.

6 6 of 36 Background Principal Study Question: PSQ Alternative Action: AA Generally, all PSQs require data via environmental measurements (old or new) to be resolved.

7 7 of 36 Background Principal Study Question: PSQ Alternative Action: AA All the possible actions that might be taken once a PSQ has been resolved.

8 8 of 36 Creating a Decision Statement PSQ+AA Decision Statement

9 9 of 36 What types of Decisions Require the DQO Process? n Only decisions whose PSQs require data (environmental measurements) to resolve n Three general types of decisions: d: Red shovel/green shovel decisions D: Decisions requiring environmental data D: Large programmatic decisions

10 10 of 36 What types of Decisions Require the DQO Process? n Only decisions whose PSQs require data (environmental measurements) to resolve n Three general types of decisions: d: Red shovel/green shovel decisions D: Decisions requiring environmental data D: Large programmatic decisions TEST: Does the PSQ require data via environmental measurements (old or new) to be resolved?

11 11 of 36 What types of Decisions Require the DQO Process? n Only decisions whose PSQs require data (environmental measurements) to resolve n Three general types of decisions: d: Red shovel/green shovel decisions D: Decisions requiring environmental data D: Large programmatic decisions Examples of technical decisions made by experts based on professional knowledge, and that require no analytical data: What PPE is required? Should we use a split spoon or a Shelby tube?

12 12 of 36 What types of Decisions Require the DQO Process? n Only decisions whose PSQs require data (environmental measurements) to resolve n Three general types of decisions: d: Red shovel/green shovel decisions D: Decisions requiring environmental data D: Large programmatic decisions Is this project regulated under the Resource Conservation and Recovery Act of 1976 (RCRA) or the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) project? (This is legal or regulatory decision, no data needed.)

13 13 of 36 What types of Decisions Require the DQO Process? n Only decisions whose PSQs require data (environmental measurements) to resolve n Three general types of decisions: d: Red shovel/green shovel decisions D: Decisions requiring environmental data D: Large programmatic decisions Do we need to collect data via environmental measurements to decide whether or not the decrease in duck population is due to the lead pellets in the wetlands?

14 14 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences Identify the questions that must be addressed in order to resolve the problem statement. Note that it is useful to divide these by either the matrix to be studied, the type waste, etc. Addressing the question will resolve the problem.

15 15 of 36 Example PSQs n Is the Smith property radiologically contaminated? n Does the waste exceed toxicity characteristic (TC) criteria? n Is the waste ignitable?

16 16 of 36 PSQs 1. Are the perimeter side slope soils contaminated? 2. Are the trench footprint soils below 20 ft contaminated? CS

17 17 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences For each question, list the actions that may be taken as a result of answering the question. These actions use verbs such as “remove, dispose, delist.” Decision rules (DRs) will be written in Step 5 to provide the criteria to select between the AAs. After data collection, DRs are used to select the appropriate AA.

18 18 of 36 Example Relationship Between PSQs and AAs

19 19 of 36 CS Relationship Between PSQs and AAs

20 20 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences Identify qualitative descriptions of the potential errors that could occur

21 21 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences List the consequences of each qualitative error listed for each PSQ and AA.

22 22 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences Perform a qualitative and relative assessment of the consequences of taking each AA. Express in terms of: Low Moderate Severe

23 23 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences When assessing consequences, take the following aspects into consideration: Human health Environment (flora/fauna) Political Economic Legal

24 24 of 36 Errors, Consequences and Severity

25 25 of 36 Errors, Consequences, and Severity CS

26 26 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences Decision statements link alternative actions with PSQs. Step 5 will provide criteria to select between alternatives.

27 27 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences Decision statements express a choice between AAs.

28 28 of 36 Decision Statements n General Format: Determine whether [Principal Study Question #1] requires [Alternative Action A] or [Alternative Action B]. n Added Clarification: Determine whether [unknown environmental condition/issue/criterion from the Problem Statement] requires [choosing between two or more Alternative Actions].

29 29 of 36 n General Format: Determine whether [Principal Study Question #1] requires [Alternative Action A] or [Alternative Action B]. n Added Clarification: Determine whether [unknown environmental condition/issue/criterion from the Problem Statement] requires [choosing between two or more Alternative Actions]. Using a standardized format is important because it helps: Eliminate red/green shovel PSQs Improve the consistency between DQO documents Make it easier for the reviewer to understand the decisions to be made Decision Statements

30 30 of 36 Decision Statement Example EXAMPLE: Determine whether [the waste contains TC constituents that exceed regulatory criteria] and requires [an evaluation of the underlying hazardous constituents] or [does not exceed TC criteria and requires consideration only of other RCRA characteristics].

31 31 of 36 EXAMPLE: Determine whether [the waste is ignitable] and requires [disposal in a RCRA landfill] or [requires only consideration of the remaining RCRA characteristics]. Decision Statement Example

32 32 of 36 ‘Typical’ Decision Statement Examples EXAMPLE: The question is whether [a cap is needed and what COPCs are needed to assess the effectiveness of the cap]. EXAMPLE: Lard oil that contained carbon tetrachloride was used; however it is unclear as to whether [the oil nad carbon tetrachloride are listed waste].

33 33 of 36 Decision Statements 1. Determine whether the perimeter side slope soils are contaminated and require remedial action or require no further action. 2. Determine whether the trench footprint soils below 20 ft are contaminated and require remedial action or require no further action. CS

34 34 of 36 Step 2 Summary n Decisions that are regulatory or professional judgement are not part of the Step 2 decisions n For the decision to be valid, there must be two or more alternative actions n Data are needed to choose between the alternative actions

35 35 of 36 Information INActions Information OUT From Previous Step To Next Step Decision Statements Concise Statement of the Problem Identify Principal Study Questions Define Alternative Actions Step 2- Identify Decisions Define Error if AA Incorrectly Taken List Consequences of Errors Rate Severity of Consequences

36 36 of 36 End of Module 3 Thank you


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