construction completion report, 3m oakdale site

Construction Completion Report(RA Implementation Report)

Oakdale Site Oakdale, Minnesota

December 2011

Revised February 2012

11P-1200-1

3M CompanySt. Paul, Minnesota

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CONSTRUCTION COMPLETION REPORT (RA IMPLEMENTATION REPORT)

OAKDALE SITE

OAKDALE, MINNESOTA

DECEMBER 2011 Revised February 2012

Prepared for

3M Company

St. Paul, Minnesota 55144

Prepared by Weston Solutions, Inc.

West Chester, Pennsylvania 19380

W.O. No. 02181.202.024

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OAKDALE, MINNESOTA CONSTRUCTION COMPLETION CERTIFICATIONS

Soil Alternative S-3

Construction mobilization commenced the week of December 2, 2010. Excavation activities were completed on May 3, 2011, with the hauling of excavated material completed on June 1, 2011. The final site survey was conducted on July 19, 2011.

The limits of soil removal, as specified in the February 2009 Remedial Design/Response Action (RD/RA) Plan for the Oakdale Site, were all met or surpassed.

2,211 truckloads, equaling 27,951 cubic yards (51,367 tons) of material, were hauled to the SKB Landfill in Rosemount, Minnesota. All excavated material was acceptable for disposal at the SKB Landfill.

The work was performed with no lost time, injuries, or near misses.

Notification to MPCA of project completion of Soil Alternative S-3, Groundwater Alternative GW-1, and Sitewide Alternative SW-2 (as noted below) on October 3, 2011.

Groundwater Alternative GW-1 Upon completion of soil excavation activities, the final components of Groundwater Alternative GW-1 were installed on the north side of Highway 5 in accordance with the RD/RA Plan and included:

Replacement of monitoring wells W-21 and W-26 with monitoring wells W-21R and W-26R the week of August 29, 2011.

Installation of extraction well PW-26 the week of August 29, 2011, with operation of the well commencing on October 3, 2011.

Site decommissioning activities, including removal of drummed cuttings generated during well installation and silt fencing, were completed on October 25, 2011.

Sitewide Alternative SW-2

3M is working with the MPCA to finalize the required deed restriction/environmental covenant for the Site.

The construction fence around the remediation area was installed in 2007 to control access during project activities and was maintained throughout construction activities. It was removed by November 2, 2011.

uffiffiG-./eIIlIrEtrtr"In accordance with the RD/RA Plan, the Groundwater and Surface Water Sampling Plan for theFormer Oakdale Disposal Site has been prepared and addresses MPCA's comments received onJarutary 13,201I. MPCA has agreed that the first monitoring event will be conducted duringthe first quarter 201,2.

.-, t J , ]

I 1-- :. +*i-j 1' t . {* ,lv'"o , Manager, Environmental Projects

3M Corporate Environmental Proqrams

James R. Kotsmith, P.E., QEP3M Company

(Title)

Technical DirectorWeston Solutions, Inc.

(Date)

tU29/11

Michael H.Weston So

Corbin, P.E., DEEions, Inc.

(Title)

Principal Project ManagerWeston Solutions, Inc.

(Date)

Jaisimha Kesari, P.E., DEEWeston Solutions, Inc.

(Title) (Date)

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iii

TABLE OF CONTENTS

Section Page 1. INTRODUCTION.......................................................................................................... 1-1

1.1 BACKGROUND ................................................................................................. 1-1 1.1.1 Site History ........................................................................................... 1-1 1.1.2 Perfluorochemical Program .................................................................. 1-2

1.2 SOIL ALTERNATIVE S-3 ................................................................................. 1-6

1.3 GROUNDWATER ALTERNATIVE GW-1 ...................................................... 1-7

1.4 SITEWIDE ALTERNATIVE SW-2.................................................................... 1-8

1.5 PURPOSE OF THE CONSTRUCTION COMPLETION REPORT .................. 1-9

1.6 RESPONSE ACTION OBJECTIVES ................................................................. 1-9

2. INTERIM RESPONSE ACTION SOIL VAPOR EXTRACTION (SVE) ............ 2-1 2.1 BACKGROUND ................................................................................................. 2-1

2.1.1 Temporary SVE System Installation .................................................... 2-1 2.1.2 Temporary SVE System Operation ...................................................... 2-3

2.2 SOIL DISPOSAL PROFILE SAMPLING .......................................................... 2-5

3. CONSTRUCTION COMPLETION SOIL ALTERNATIVE S-3 .......................... 3-1 3.1 CONSTRUCTION CHRONOLOGY .................................................................. 3-1

3.1.1 Summary of Construction Activities .................................................... 3-2 3.2 APPROVAL AND PERMITS ............................................................................. 3-3

3.3 SITE PREPARATION......................................................................................... 3-4

3.4 SURVEY CONTROL .......................................................................................... 3-7

3.5 EXCAVATION ACTIVITIES ............................................................................ 3-7 3.5.1 Direct Load Soils .................................................................................. 3-9 3.5.2 Stockpiled Soils .................................................................................. 3-11

3.5.2.1 Stockpile Management...................................................... 3-14 3.5.2.2 Disposal at SKB Nonhazardous Landfill ........................... 3-14

3.5.3 Truck Loading/Unloading Operations ................................................ 3-15 3.5.4 Non-Soil Debris .................................................................................. 3-17 3.5.5 Water Management ............................................................................. 3-17

3.6 SURVEY VERIFICATION OF EXCAVATION LIMITS ............................... 3-18

3.7 OPERATIONAL RECORDS ............................................................................ 3-19 3.7.1 Daily Reports ...................................................................................... 3-19 3.7.2 Meteorological Station Data ............................................................... 3-20 3.7.3 Perimeter Monitoring .......................................................................... 3-21

3.8 DECOMMISSIONING ACTIVITIES............................................................... 3-23

TABLE OF CONTENTS (CONTINUED)

Section Page

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3.9 BACKFILLING, FINAL GRADING, AND REVEGETATION ..................... 3-24

4. CONSTRUCTION COMPLETION GROUNDWATER ALTERNATIVE GW-1 ............................................................................................................................... 4-1 4.1 INITIAL GROUNDWATER EXTRACTION AND TREATMENT

SYSTEM ACTIVITIES ....................................................................................... 4-1 4.1.1 Description of System ........................................................................... 4-1 4.1.2 Submission of Groundwater Treatment System Construction

Completion Report ................................................................................ 4-3 4.2 FINAL GROUNDWATER EXTRACTION AND TREATMENT

SYSTEM ACTIVITIES ....................................................................................... 4-4 4.2.1 Construction Chronology ...................................................................... 4-4 4.2.2 Extraction and Monitoring Well Installation ........................................ 4-4 4.2.3 Well Development ................................................................................ 4-5 4.2.4 Installation of Pump and Conveyance Piping ....................................... 4-6

5. CONSTRUCTION COMPLETION SITEWIDE ALTERNATIVE SW-2 ........... 5-1 5.1 DEED RESTRICTIONS ...................................................................................... 5-1

5.2 FENCE AND ACCESS RESTRICTIONS .......................................................... 5-2 5.3 LONG-TERM MONITORING PLAN ................................................................ 5-2

5.3.1 Groundwater and Surface Water Monitoring ....................................... 5-2 5.3.2 Treated Water Discharge Monitoring ................................................... 5-4

6. REFERENCES ............................................................................................................... 6-1

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LIST OF APPENDICES

APPENDIX A: PHOTOGRAPH LOG

APPEND