ABBREVIATIONS PCE perchloroethylene, tetrachloroethene, or perc TCE trichloroethylene or trichloroethene DCE dichloroethene VC vinyl chloride DNAPL dense non-aqueous phase liquid NAPL non-aqueous phase liquid VOC volatile organic chemical bgs below ground surface MLS multi-level sampling well RW recovery or extraction well IW injection well PITT partitioning interwell tracer test BTC breakthrough curve ISB in situ bioremediation SERB solvent extraction residual biotreatment MCL maximum contaminant limit RBCA risk-based corrective action CDF cumulative distribution function FNR fractional NAPL removal ENR estimated NAPL removal FFR fractional flux reduction IFT interfacial tension