Conceptual CAD Worksheet

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ConceptualCorrective Action DesignWorksheet

Guidance Document4-19

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Complete this worksheetand include as Appendix H in Guidance Document 4-06 Investigation Report Form when recommending any type of corrective action as part of an LSI/RI. In cases where corrective action is being recommended or requested any time after Minnesota Pollution Control Agency (MPCA) review of the Investigation Report Form, the worksheet should be submitted independently upon MPCA request. For non-mechanical corrective actions such as excavation, well replacement, etc., complete Part A only. For engineered mechanical remediation systems such as automated free product recovery, soil vapor extraction, air sparging, multiphase extraction, etc., complete Part B only. Do not revise or delete any text or questions from this report form. MPCA staff expect that corrective action will be evaluated by a qualified and experienced consultant so that, for most sites, it will be sufficient to provide answers to the following items in a paragraph or less.

Refer to Guidance Document 1-01 Petroleum Remediation Program General Policy for the overall corrective action goals, and to Guidance Document 4-10 Elements of the Corrective Action Design for a discussion of the corrective action design (CAD) process and other requirements. ======

PART A. Non-Mechanical Corrective Actions

  1. Identify the corrective action reason (i.e., why is corrective action necessary, what actual impacts and/or risk reduction must the CAD address?).
  1. Identify the corrective action goal.
  1. Identify the corrective action options considered.
  1. Identify the recommended corrective action(s).
  1. Discuss how the recommended corrective action(s) will eliminate or reduce the risk.
  1. Provide an outline of major tasks and milestones to be completed with a proposed schedule for their completion.

PART B. Engineered Mechanical Remediation Systems

  1. Identify the corrective action reason (i.e., why is corrective action necessary, what actual impacts and/or risk reduction must the CAD address?).
  1. Identify various technology options considered.
  1. Identify the selected technology, provide a rationale for why it is the recommended option, and provide additional discussion about the CAD focus such as whether the selected CAD is for mass removal, pathway interruption (e.g., barrier trench), and/or stimulation of natural attenuation/biodegradation.
  1. Identify the basic above and below ground components (e.g., wells, pumps, blowers, treatment equipment, discharges) of the selected CAD. Identifyand provide justification for the general area being targeted for treatment and the likely screened intervals for injection and/or extraction points. Discuss any waste streams that will be generated by the system and how those could or will be handled.
  1. Identify basic, measurable corrective action performance goals or milestones and how progress towards these goals will be measured.
  1. Identify and provide a rationale for any required or recommended pilot testing, or additional work (e.g., LIF borings), that needs to be completed before a detailed CAD can be completed.
  1. Describe where you plan to conduct the pilot test. Include a rationale for extraction, injection, and/or monitoring point locations and their screened intervals. Describe and justify how long various phases of the pilot test will be conducted.
  1. Propose a schedule for completing the pilot test and submittal of the Detailed CAD Report.

Guidance Document c-prp4-19: April 2005

Petroleum Remediation Program

Minnesota Pollution Control Agency