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2012 Annual Groundwater Monitoring and Evaluation Report <br /> Full-Scale In Situ Hexavalent Chromium Reduction Treatment Implementation <br /> Former Marley Cooling Tower Site, Stockton,California February 2013 <br /> ACRONYMS AND ABBREVIATIONS <br /> µg/L micrograms per liter <br /> As arsenic <br /> As III trivalent arsenic <br /> As V pentavalent arsenic <br /> bgs below ground surface <br /> CaSX calcium polysulfide <br /> CVRWQCB California Central Valley Regional Water Quality Control Board <br /> Cr chromium <br /> Cr+6 hexavalent chromium <br /> DO dissolved oxygen <br /> DTSC California Department of Toxic Substances Control <br /> Dudek Dudek and Associates, Inc. <br /> EC electrical conductivity <br /> EPA U.S. Environmental Protection Agency <br /> Fe iron <br /> ft/day foot per day <br /> ft/ft foot per foot <br /> H+A Hargis +Associates, Inc. <br /> J Refers to the value being detected but below the reporting limit; therefore, <br /> the result in an estimated concentration <br /> MCL maximum contaminant level <br /> MCTC Marley Cooling Tower Company <br /> mg/L milligram per liter <br /> Mn manganese <br /> MRP Monitoring and Reporting Program <br /> msl mean sea level <br /> mV millivolt <br /> MWH MWH Americas, Inc. <br /> ORP oxidation reduction potential <br /> QA/QC quality assurance/quality control <br /> RAICR Remedial Action Implementation Completion Report <br /> RAIWP Remedial Action Implementation Work Plan <br /> RAP Remedial Action Plan <br /> redox reduction/oxidation <br /> RL reporting limit <br /> Site former Marley Cooling Tower Company facility <br /> SO4 sulfate <br /> SPX SPX Corporation <br /> SRB sulfate-reducing bacteria <br /> TDS total dissolved solids <br /> (a MWH011 <br /> v <br />