A validation study.

(a) Decontaminate the following prepared sample surfaces using the selected testing parameters and experimental conditions. Take a standard wipe sample of the decontaminated surface. (1) At least one uncontaminated surface. The surface levels of PCBs on the uncontaminated surface must be <1 µg/100 cm 2 . (2) At least seven contaminated surfaces. (b)(1) Select applicable method(s) from the following list to extract PCBs and determine the PCB concentration from the standard wipe sample collection medium: SW-846 Method 3540C, Method 3550C, Method 3541, Method 3545A, Method 3546, or Method 8082A (all standards incorporated by reference in § 761.19). Modifications to the methods listed in this paragraph or alternative methods not listed may be used if validated under subpart Q of this part. (2) Report all validation study surface sample concentrations on the basis of micrograms of PCBs per 100 cm 2 of surface sampled. (c) Following completion of the validation study, measurements from the contaminated surfaces must have an arithmetic mean of ≤10 µg/100 cm 2 . If the arithmetic mean is >10 µg/100 cm 2 , then the validation study failed and the solvent may not be used for decontamination under § 761.79(d)(4) according to the parameters tested. [63 FR 35473, June 29, 1998, as amended at 88 FR 59696, Aug. 29, 2023]