Development of Cleanup Methods for PCB Containing Elastic Sealant Used in Outdoor Joints between Concrete Blocks in Buildings. The goals of the project were to develop cleanup methods for PCB containing elastic sealants used in outdoor joints between concrete blocks and to minimise the PCB spread to the outdoor environment, to the indoor air and also to keep the PCB levels as low as reasonably possible in the workplace environment during the work with taking away the sealant. Analyses of PCB are done within the project. The cleanup process consisted of different steps, (1) cutting the elastic sealant with an oscillating knife, (2) grinding of the concrete with a mechanical machine, (3) sawing the concrete with a machine (4) cutting the concrete with a machine chisel. At all these different steps a high capacity vacuum cleaner which was connected to the machines was used. The following PCB analyses were done (1) concentration in the elastic sealant, (2) concentration in the concrete close to the sealant, (3) concentration in soil, (4) concentration in the indoor air, (5) concentration in the air in the workplace environment. The elastic sealant contained 6 % total PCB of a technical product with a composition most similar to Clophen A40. The concrete close to the sealant (first 1-2 mm) contained 0,11 % and 1,7 % total PCB at two different places. The pattern of the PCBs resembled that of the sealant. PCB concentrations, å7PCB, in the soil increased during the work with the sealants with 0,08 mg/kg dry soil 1 meter from the building and with less than 0,03 mg/kg dry soil 10 meters from the building. The source of the PCB in the soil is most likely the sealant as the pattern of the PCB-congenes is similar. The PCB levels in the workplace air in the beginning of the project when the equipment used were not fully developed were generally above the occupational exposure limit 10 mg/m3 (up to 120 mg/m3). Later when the equipment were optimised to better take care of dust and gases produced during the cutting and grinding etc, levels were below or close to 10 mg/m3. The pattern of the PCBs in the workplace air was different from that of the sealant containing more of the lighter components. The PCB concentration in the indoor air were measured before and under the work with cleaning-up the sealants. The levels were around 600 ng/m3 and there was no significant increase during the work with taking away the sealant. The PCB level indoor, after the work with cleaning-up the sealants, does not show any decrease two months after the end of the work. The pattern of the PCBs in the indoor air were different from that of the sealant as well as that of the work place air, more of the lighter PCB were present indoors compared to the composition in both workplace air and in sealant.