Select applicable method(s) from the following list to extract PCBs and determine the PCB concentration from individual and composite samples of PCB remediation waste: SW-846 Method 3510C, Method 3520C, Method 3535A, Method 3540C, 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 or authorized in a § 761.61(c) approval.