The following experimental conditions apply for any solvent:
(a) Temperature and pressure. Conduct the validation study and perform decontamination at room temperature (from =15 [deg]C to <=30 [deg]C) and at atmospheric pressure.
(b) Agitation. Limit the movement in the solvent to the short-term movement from placing the contaminated surface into the soak solvent and from removing the surface from the soak solvent.
(c) Time of soak. Soak the surface for a minimum of 1 hour.
(d) Surface conditions for the validation study. Prior to beginning the validation study, ensure that there are no free-flowing liquids on surfaces and that surfaces are dry (i.e., there are no liquids visible without magnification). Also ensure that surfaces are virtually free from non-liquid residues, corrosion, and other defects which would prevent the solvent from freely circulating over the surface.
(e) Confirmatory sampling for the validation study. Select surface sample locations using representative sampling or a census. Sample a minimum area of 100 cm\2\ on each individual surface in the validation study. Measure surface concentrations using the standard wipe test, as defined in Sec. 761.123, from which a standard wipe sample is generated for chemical analysis. Guidance for wipe sampling appears in the document entitled ``Wipe Sampling and Double Wash/Rinse Cleanup as Recommended by the Environmental Protection Agency PCB Spill Cleanup Policy,'' available on EPA's Web site at http://www.epa.gov/pcb, or from the Program Management, Communications, and Analysis Office, Office of Resource Conservation and Recovery (5305P), Environmental Protection Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460-0001.
(f) Concentration of PCBs. The method validated may be used only to decontaminate surfaces containing PCBs at concentrations on which the validation study was performed and lower concentrations. [63 FR 35473, June 29, 1998, as amended at 72 FR 57241, Oct. 9, 2007; 74 FR 30235, June 25, 2009]