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ASPECT CONSULTING <br />xii FINAL PROJECT NO. AS190583A-08  MAY 21, 2025 <br />MassDEP Massachusetts Department of Environmental Protection <br />mg/kg milligrams/kilograms <br />mg/L milligrams per liter <br />MHHW mean higher high water <br />MIE Maritime Industrial Expansion <br />MLLW mean lower low water <br />MNA monitored natural attenuation <br />MTCA Model Toxics Control Act <br />NAPL non-aqueous-phase liquid <br />ncPAH noncarcinogenic polycyclic aromatic hydrocarbon <br />No. number <br />NOEC no observed effect concentration <br />NOI Notice of Intent <br />NPDES National Pollutant Discharge Elimination System <br />NTR National Toxics Rule <br />O&M operation and maintenance <br />ORP oxidation-reduction potential <br />OSHA Occupational Safety and Health Administration <br />PAH polycyclic aromatic hydrocarbon <br />PCB polychlorinated biphenyl <br />PCE tetrachloroethylene (perchloroethylene) <br />PCL preliminary cleanup level <br />PCP pentachlorophenol <br />PEG Pacific Environmental Group <br />pH negative log of the hydrogen ion concentration in solution <br />POTW publicly owned treatment works <br />PQL practical quantitation limit <br />PRB permeable reactive barrier <br />PSAPCA Puget Sound Air Pollution Control Agency <br />PSCAA Puget Sound Clean Air Agency <br />PSI Puget Sound Initiative <br />PUD Snohomish County Public Utility District <br />Pyron Pyron Environmental, Inc.