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  • FIVE-YEAR REVIEW REPORT FOR

    OAKDALE DUMP SUPERFUND SITE

    WASHINGT~N COUNTY, MINNESOTA

    MND980609515

    Minnesota PoUution Control Agency

    US EPA RECORDS CENTER REGION 5

    Illllll 111111111111111111111111111111111 480198

    Prepared by

    Minnesota Pellution Control Agency St. Paul, Minnesota

    Kathy S er, DirectOt'. Date Remediation Division MPCA

    f?.:+_.e t1 JU- q.11,-1'f R1chard C. Karl, Dh·ectm· Date Superfund Division U.S. EPA Region 5

  • TABLE OF CONTENTS

    EXECUTIVE SUMMARY ............................................................................................................ 4

    I. INTRODUCTION .. ···············.·································-···························································· 9

    II. PROGRESS SINCE THE LAST REVIEW ..................................................................... IO

    III. FIVE-YEAR REVIEW PROCESS .......................................... : ........................................ 14

    IV. TECHNICAL ASSESSMENT ..................................... _. ................................................... 17

    V. ISSUES/RECOMMENDATIONS AND FOLLOW-UP ACTIONS ............................... 20

    VI. PROTECTIVENESS STATEMENT .................. , ............................................................. 20

    VII. NEXT REVIEW ........................................... _ .................................... _. ............................... 21

    TABLES

    Table 1. Protectiveness Determinations/Statements from the 2009 FYR .......................................8

    Table. 2. Status of Recommendations from the 2009 FYR ............................................................. &

    Table 3: Institutional Control Summary ...................................................................................... 11

    Table 4. Issues and Recommendations/Follow-up Actions ........................... ,. .............................. 19

    APPENDIX A - Existing Site Information

    APPENDIX B - Additional Maps, Data, Figures, and Tables

    APPENDIX C - Community Notification

  • LIST OF ACRONYMS

    3M AMR ARAR CERCLA CERCLIS

    co 1983 EPA FYR GAC GMP HBV HRL

    I Cs

    IPE

    MCES

    MCL

    MDD

    MDH

    MERLA MPCA

    NCP

    NPL

    O&M

    OU

    PCB

    PFBA

    PFBS

    PF Cs

    PFOA

    ·PFOS POTW ppm ppb QAPP PRP RAO RAP ROD SACO SVE UECA µg/L UU/UE voe

    Minnesota Mining and Manufacturing Annual Monitoring Report Applicable or Rei'evant and Appropriate Requirement Comprehensive Environmental Response, Compensation, and Liability Act Comprehensive Environmental Response, Compensation, and Liability Information System Consent Order signed between MPCA, EPA and 3M, 7/26/83 United States Environmental Protection Agency Five-Year Review · Granular Activated Carbon Groundwater .Monitoring Plari Health Based Value Health Risk Limit Institutional Controls Isopropyl Ether Metropolitan Council Environmental Services . Maximum Contaminant Level Minnesota Decision Document Minnesota Department of Health Minnesota Environmental Response and Liability Act Minnesota Pollution Control Agency National Contingency Plan National Priorities List Operation and Maintenance Operable Unit Polychlorinated Biphenyl Perfluorobutanoic acid Perfluorobutane sulfonate Perfluorochemicals Perfluorooctanic acid. Perfluorooctane sulfonate Publicly Owned Treatment Works parts per million parts per billion Quality Assurance Project Plan Potentially Responsible Pc:irty Remedial Action Objectives Remedial Action Plan Record of Decision Settlement Agreement and Consent Order signed by MPCA and 3M, 5/22/07 Soil Vapor Extraction Universal Environmental Covenants Act Micrograms per Liter unlimited use and unrestricted exposure Volatile Organic Compound

  • EXECUTIVE SUMMARY

    This is the fifth Five-Year Review (FYR) for the Oakdale Dump Site (Site) (a.k.a. 3M Oakdale Disposal Site, or Oakdale Disposal Sites) located in Oakdale, Washington County, Minnesota. The purpose of this FYR is to review information to deterinine if the remedy is and will continue to be protective of human health and the environment. The triggering action for this policy FYR was the signing of the previous FYR on 911712009.

    The Site consists of three separate non-contiguous properties (Abresch, Brockman, and Eberle) that were historically used to dispose of industrial and non-industrial wastes. Initial investigations identified volatile organic compounds (VOCs) in the soil and groundwater at the Site. The remedy prescribed in a 1983 Consent Order (CO) included identification and removal of buried wastes and contaminated soil, containment of contaminated groundwater through extraction and discharge to the sanitary sewer, identification and sealing of multi-aquifer wells, and long-term groundwater monitoring .. These response actions were initiated in the mid- l 980s, with excavation and removal of buried wastes at the Abresch and Brockman properties, sealing of 39 multi-aquifer wells and installation of a groundwater pump-out system.

    No response actions were necessary or required at the Eberle property. VOC investigations and follow-up actions have been completed for the Brockman property based on information presented in previous five year reviews. Response actions are continuing on the Abresch property. See Appendix A for additional background information on the Site.

    Groundwater quality monitoring and operation of the groundwater extraction system are currently on-going at the Abresch property. Since 1985, an estimated volume of over 41,000 gallons of voes has been removed by the extraction system which has pumped over 500 million gallons of groundwater during that time as documented in the 2012 Annual Volatile Organic

    · Compound (VOC) Groundwater Monitoring Report (Weston, May, 2013). The groundwater extraction system continues to control the horizontal and vertical migration of voe impacted groundwater. Groundwater levels in the shallow and basal alluvium monitoring wells have maintained lower elevations than groundwater elevations in the underlying Platteville bedrock formation consistently since 1985. In general, total VOC concentrations in Site monitoring wells have shown decreasing trends over time as shown by the data included in Appendix B ofthis report.

    Perfluorochemicals (PFCs) were identified in soil and groundwater at the Site in 2004. Investigation of the extent and magnitude of the PFC impacts was conducted. 3M and the MPCA signed a Settlement Agreement and Consent Order (SACO) in 2007 to address the PFC contamination atthe Site. Terms and conditions of the SACO to address PFC contamination at the Site, and necessary response actions completed by 3M, were consistent with requirements outlined in the National Contingency Plan (NCP). PFC response actions were only required at the Abresch portion of the Site .. Response actions were unnecessary at the Brockman or Eberle properties. PFC references are presented to summarize activities that have occurred at the Site as they relate to the voe impacts.

    The Minnesota Decision Document (MDD) signed by MPCA on November 4, 2008 outlined remedial actions to respond to the PFC impacts to the Site. The selected response actions included the excavation and off-site disposal ofremaining PFC wastes, enhancement of the current groundwater recovery system, long-term groundwater and surface water monitoring, and

    4

  • implementation of institutional controls (I Cs). In addition, 3M has provided funding to the city of Oakdale for the installation and maintenance of a. carbon treatment system to remove PFCs found in two of the city's municipal supply wells. 3M reimburses MPCA's costs for the installation/maintenance of whole house Granular Activated Carbon (GAC) systems at residential homes in Lake Elmo, which have shown PFC contamination impacts from the Site. 3M is also required under the 2007 SACO to treat or replace any public or private drinking water supply well which is impacted by PFCs above Minnesota Department of Health (MDH) drinking water standards. MDH has developed Health Risk Limits (HRLs) for Perfluorooctanic acid (PFOA) and Perfluorooctane sulfonate (PFOS) as well as a HBV for Perfluorobutanoic acid (PFBA).

    Certain components ofthe MPCA approved response action plan (soil vapor extraction and groundwater treatment) will enhance the response actions implemented under the 1983 CO. Over 50,000 tons of PFC and VOC impacted soil was excavated from the north side of the Abresch part of the Site in 2010 and 2011 following the removal of approximately 27 ,000 pounds ofVOCs through a soil vapor extraction.system over a 1.5-year period. Groundwater extraction wells were installed to control the flow of PFC contaminated groul}dwater. These wells also extract VOCs. The 2012 Annual Volatile Organic Compound (VOC) Groundwater Monitoring Report (Weston, May, 2013) documents the VOC removal which has occurred on the Site. Extracted groundwater is· treated with a GAC system prior to discharge to a publically owned sanitary sewer system.

    The Site is bordered by residential and comm·ercial land uses. Migration of VOCs in soil vapor towards residential and commercial off-site receptors was a potential concern reviewed for this FYR. AECOM

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