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ASPECT CONSULTING <br />ii FINAL PROJECT NO. AS190583A-08  MAY 21, 2025 <br />3.1.12 Latex Spill Investigation (2009) ........................................................... 32 <br />3.1.13 Characterization of Soil Removed from Sand Filter 1 Foundation (Old <br />Boiler House) (2011) .......................................................................... 33 <br />3.1.14 Phase 1 ESA (2011) ........................................................................... 33 <br />3.2 Independent Phase 2 ESA (2012) ............................................................ 35 <br />3.3 Hazardous Waste Accumulation Unit Closure (2012) .............................. 39 <br />4 Remedial Investigation Activities ............................................................. 41 <br />4.1 First Interim Action (2013-2014) ............................................................... 43 <br />4.1.1 Soil Removal during First Interim Action ............................................. 43 <br />4.1.2 Interim Action Confirmational Groundwater Monitoring (2014-2016) ... 44 <br />4.2 Additions to RI/FS Work Plan ................................................................... 45 <br />4.2.1 Vapor Intrusion Assessment for Distribution Warehouse (March and <br />November 2014) ................................................................................. 45 <br />4.2.2 Intertidal Porewater and Seep Sampling (February and August 2014) 46 <br />4.2.3 Supplemental Intertidal Porewater Sampling for Free Sulfide (February <br />2015) .................................................................................................. 47 <br />4.2.4 Supplemental Data Collection Supporting FS (September 2015) ........ 47 <br />4.2.5 Supplemental Intertidal Seep Sampling (October 2016) ..................... 47 <br />4.2.6 Supplemental Site-Wide Groundwater Sampling (March 2017) .......... 49 <br />4.2.7 Supplemental Investigation of Log Pond (March-July 2017) ............... 49 <br />4.3 Second Interim Action (2020) ................................................................... 50 <br />4.4 City of Everett Investigation and Cleanup of Drainage Swale on their <br />Property (2019-2021) ............................................................................... 51 <br />4.5 Groundwater pH Monitoring during CM Removal ..................................... 53 <br />4.6 MIE Geotechnical Explorations (2020-2022) ............................................ 54 <br />4.7 Combined Sewer Main Improvements (2022) .......................................... 54 <br />4.8 Third Interim Action (2021-2023) .............................................................. 55 <br />5 Preliminary Cleanup Levels (PCLs) ......................................................... 57 <br />5.1 Current and Future Land and Water Uses ............................................... 57 <br />5.1.1 Land Use ............................................................................................ 57 <br />5.1.2 Water Use .......................................................................................... 59 <br />5.2 Potential Receptors and Exposure Pathways .......................................... 59 <br />5.2.1 Soil Exposure Pathways ..................................................................... 59 <br />5.2.2 Groundwater Exposure Pathways ...................................................... 60 <br />5.3 Development of Soil, Groundwater, and Air Preliminary Cleanup Levels . 61 <br />5.3.1 Groundwater PCLs ............................................................................. 61 <br />5.3.2 Soil PCLs ........................................................................................... 62 <br />5.3.3 Air PCLs and Screening Levels .......................................................... 65 <br />6 Remedial Investigation Results ................................................................ 66 <br />6.1 Data Set Used for Remedial Investigation ................................................ 66 <br />6.2 Site Units for Remedial Investigation........................................................ 66 <br />6.2.1 Unit A ................................................................................................. 67 <br />6.2.2 Unit B ................................................................................................. 67