Document ykqNBEgVqqj6rEzNKe75Z15KX

LETTER OF TRANSMITTAL August 10, 2018 To: Sara Sparks, EPA Region 8 400 N. Main, Room 339 Butte, MT 59701 NewFields From: David Tooke, NewFields 700 SW Higgins Ave, Suite 15 Missoula, MT 59803 We are sending you the following items: Line Number Copies Enclosed Description 1 1 Draft Report: Geotechnical Evaluation of the Clark Fork River Berm (pdf) 2 1 Draft Text: Geotechnical Evaluation of the Clark Fork River Berm (docx) For your files M For your review/approval Per your request Return of loaned document/materials DSign and return Please call ________________________________________________________________________________________ A field exploration and seepage/stability evaluation of the CFR berm at the former Smurfit-Stone/ Frenchtown Mill, including sampling and analysis of the berm materials, was requested by the U.S. Environmental Protection Agency (EPA) in a letter dated April 25, 2017. The primary goal of this study was to evaluate whether the stability of the CFR berm provides minimum factors of safety against failure during high water (design flood) conditions. The evaluation was completed in accordance with Addendum No. 6 to the Remedial Investigation Work Plan (RIWP; NewFields, 2017). A draft report was submitted to the EPA on July 30, 2018. The draft report described the investigation approach, and findings of the geotechnical evaluation. Minor modifications to the report were suggested during a quarterly technical meeting with the EPA on August 7, 2018. The enclosed report includes the revisions recommended by EPA. A text version of the body of the report is enclosed. A pdf version of the full report can be downloaded from Ex. 6 Please direct questions and comments to David Tooke; dtooke@newfields.com; {___ Ex: 6 www.NewFields.com 700 SW Higgins Ave, Suite 15, Missoula, Montana 59803 T. 406.549-8270 Sierra Club v. EPA 18cv3472 NDCA Tier 10 ED 002061 00090960-00001