\       UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
            |                      WASHINGTON, D.C. 20460
                                              1 '-20H                         OFFICE OF
                                                                             SOLID WASTE AND
                                                                           EMERGENCY RESPONSE


                                                                            OSWER 9283.1-45

MEMORANDUM

SUBJECT:  Transmittal of the Recommended Approach for Evaluating Completion of Groundwater
             Restoration Remedial Actions at a Groundwater Monitoring Well and the Groundwater
             Statistics Tool
FROM: rY
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action is complete. Both the attached recommended approach and the tool support evaluation of progress
toward aquifer restoration and attainment of remedial action objectives and associated cleanup levels.

Groundjwater_Statistic_sTool

The Groundwater Statistics Tool is designed to help evaluate COC concentrations on a well-by-well
basis to determine whether a groundwater restoration remedial action is complete. The Groundwater
Statistics Tool is an optional tool for use by EPA regions; use of the tool is not required.  The tool is
designed to support the Guidance for Evaluating Completion of Groundwater Restoration Remedial
Actions and comports with principles outlined in the Recommended Approach for Evaluating
Completion of Groundwater Restoration Remedial Actions at a Groundwater Monitoring Well. The tool
is a Microsoft Excel workbook that is intended to evaluate data for a single COC at a single well.

If you have any questions on either the document of the tool, please have your staff contact Kate Garufi
at garufi.kathcrine::g;epa.gov or (703) 603-8827 or David Bartenfelder at bartenfeldcr.david(7;cpo.gov or
(703) 603-9047.

Attachments

cc:    Mathy Stanislaus, OSWER
      Nitin Natarajan, OSWER
      Barry Breen, OSWER
      Larry Stanton, OSWER/OEM
      David Lloyd, OSWER/OBLR
      Barnes Johnson, OSWER/ORCR
      Carolyn Hoskinson, OSWER/OUST
      Brigid Lowery, OSWER/CPA
      Rafael Deleon, OECA/OSRE
      Dave  Kling, OECA/FFEO
      Mary-Kay Lynch, OGC/SWERLO
      John Michaud, OGC/SWERLO
      Earl Salo, OGC/SWERLO
      Charlotte Bertrand, OSWER/FFRRO
      Dana Stalcup, OS WER/OSRT1
      David E. Cooper, OSWER/OSRTI
      Richard Jeng, OSWER/OSRTI
      Kate Garufi, OSWER/OSRTI
      Benjamin Simes, OSWER/FFRRO
      Lisa Price, Superfund Lead Region Coordinator, US  EPA Region 6
      NARPM Co-Chairs
      Groundwater Forum Co-Chairs
      Federal Facility Forum Co-Chairs
      OSRTI Documents Coordinator
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