(a) Report all sample concentrations for non-liquid PCBs on a dry weight basis as micrograms of PCBs per gram of sample (ppm by weight). Report surface sampling results as [micro]g/100 cm\2\. Divide 100 cm\2\ by the surface area and multiply this quotient by the total number of micrograms of PCBs on the surface to obtain the equivalent measurement of micrograms per 100 cm\2\.
(b) Report all sample concentrations for liquid PCBs on a wet weight basis as micrograms of PCBs per gram of sample (ppm by weight). Subpart O_Sampling To Verify Completion of Self-Implementing Cleanup and
On-Site Disposal of Bulk PCB Remediation Waste and Porous Surfaces in
Accordance With 761.61(a)(6)
Source: 63 FR 35465, June 29, 1998, unless otherwise noted.