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ASPECT CONSULTING <br />PROJECT NO. AS190583A-08  MAY 21, 2025 FINAL i <br /> <br />Contents <br />Acronyms ............................................................................................................ x <br />Executive Summary ...................................................................................... ES-1 <br />Interim Actions ................................................................................................ ES-1 <br />Remedial Investigation ................................................................................... ES-2 <br />Feasibility Study ............................................................................................. ES-3 <br />1 Introduction ................................................................................................. 1 <br />2 Site Background and Setting ..................................................................... 3 <br />2.1 Location Description ................................................................................... 3 <br />2.1.1 Upland Area Location ........................................................................... 3 <br />2.1.2 Surrounding Properties ......................................................................... 3 <br />2.2 Site History ................................................................................................. 4 <br />2.2.1 Early Development History ................................................................... 4 <br />2.2.2 Historical Sanborn Fire Insurance Maps Review ................................... 4 <br />2.2.3 History of Pulp and Paper Mill Operations ............................................ 5 <br />2.2.4 History of Bulk Fuel Storage and Distribution ........................................ 8 <br />2.2.5 Naval Reserve Property ........................................................................ 8 <br />2.3 Cultural Resources ..................................................................................... 9 <br />2.3.1 Archaeological Monitoring During Interim Actions ................................. 9 <br />2.4 Environmental Setting .............................................................................. 10 <br />2.4.1 Topography ........................................................................................ 10 <br />2.4.2 Climate ............................................................................................... 11 <br />2.4.3 Ecological Setting ............................................................................... 11 <br />2.4.4 Hydrogeology and Groundwater Flow ................................................. 12 <br />2.4.5 Storm Water Management .................................................................. 21 <br />3 Previous Remedial Actions ...................................................................... 23 <br />3.1 Independent Remedial Actions During Mill Operations ............................. 23 <br />3.1.1 Removal of Gasoline UST No. 69 (1989) ............................................ 23 <br />3.1.2 Heavy Duty Shop Soil Removal (1991) ............................................... 23 <br />3.1.3 Removal and Investigation of Five USTs (1989-1990) ........................ 24 <br />3.1.4 Investigation in Vicinity of Old Paint Shop (1994) ................................ 24 <br />3.1.5 UST No. 29 Xylene Release and Independent Cleanup (1989-1994) . 25 <br />3.1.6 Independent Soil Cleanup in Bunker C Fuel Oil AST Area (1995) ....... 28 <br />3.1.7 U.S. Navy’s Independent Cleanup of Naval Reserve Parcel (1996- <br />1998) .................................................................................................. 29 <br />3.1.8 Investigation of Bulk Fuel Facilities (1998) .......................................... 30 <br />3.1.9 PCB Decontamination of Substations (1995-2004) ............................. 31 <br />3.1.10 Removal of UST No. 68R (1999) ........................................................ 32 <br />3.1.11 Bunker C Fuel Oil Soil Removal, Bleach Unit 2 (1999) ....................... 32