In general, the purpose of the probe
system is to provide improved rapid
field methods using re-designed direct
push technology (DPT) and “push-pull testing” concepts to evaluate in situ chemical, biochemical, surfactant, adsorptive media, and leaching and fixation remediation technologies for hazardous subsurface contaminant(s). The probe
system and methods described here when applied to a
hazardous waste site being considered for
in situ remediation of contaminants (organic or inorganic) by the listed treatment technologies will yield information that greatly reduces the uncertainty with regards to treatment effectiveness for the in situ soil,
groundwater, and contaminant(s) conditions affecting dosage requirements and
reaction rate(s) for various reactants. The probe
system described here is multi-purpose in that it was designed: 1) to measure the
relative permeability of the subsurface soil and
groundwater to a liquid or gas ejectant, 2) to recover
soil gas, soil, or
groundwater samples for contaminant analyses, 3) to measure the chemical dosage and reaction,
dissolution, adsorption,
desorption, leaching, or fixation rate of a reactant such as a chemical or biochemical oxidant, metallic or bimetallic dehalogenating agent, surfactant or emulsifier solution, adsorbent media regenerant, leaching or fixation
reagent that is injected into the matrix and withdrawn during a push-pull test, 4) to perform combinations of the above, 5) to measure the
in situ adsorption capacity of adsorbent media and subsequently measure the effectiveness of regenerant(s) for the adsorbent media, and (6) to measure the effectiveness of a treated
soil column for inorganic contaminant(s) leaching or fixation. In addition to being an in situ remedial alternatives evaluation tool, the probe system can be used as a reactant(s) delivery device after the specific remedial technology has been selected.