Or there was plastic stuck to the machines used to sample and it contaminated the area during sampling. Or there was plastic in the lab during testing. Though potentially those should have been ruled out by testing a blank sample and a control sample of just the ‘empty’ sampling equipment.
Or there was plastic stuck to the machines used to sample and it contaminated the area during sampling. Or there was plastic in the lab during testing. Though potentially those should have been ruled out by testing a blank sample and a control sample of just the ‘empty’ sampling equipment.