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Equation 1.            ω = ^{(K_HRX π r_HRX2 i_HRX)} ⁄ _{(KA bA iA)}

Equation 1.            w_ave = ^{(K_HRX π r_HRX2 i_HRX)} ⁄ _{(KA bA iA)}

Table 1. Potential reactive media types and target groundwater contaminants for an HRX Well

Reactive Media	Potential Target Groundwater Contaminants
Zero valent iron (ZVI) Bimetallics (e.g., ZVI + Pd, Pt, or Ni)	Chlorinated solvents (CVOCs), nitrate, perchlorate, energetics, chromium, arsenic
Granulated activated carbon (GAC) Organosilicates	CVOCs, Poly- and Perfluoroalkyl substances (PFASs), hydrocarbons, halomethanes
Sustained Release Oxidants	CVOCs, 1,4-dioxane, hydrocarbons, polyaromatic hydrocarbons (PAHs), phenolic compounds
Biodegradable particulate organic carbon (e.g., mulch)	CVOCs, nitrate, perchlorate, energetics
Ion exchange resins	PFAS, brines
Phosphates (e.g., apatite)	Lead, uranium, other metals and radionuclides
Limestone, lime, magnesium oxide	Low pH, acid rock drainage
Barium sulfate (barite)	Radium
Iron sulfide	Chromium, high pH
Zeolites	Ammonium, radionuclides, PFAS