FURTHER to our letter (South China Morning Post, January 2) concerning the noise from construction activities at the Hongkong Stadium, we would like to provide information on the findings of our recent surveillance activities. Over the past two weeks, we checked 10 construction sites in Happy Valley and the Mid-levels during the restricted hours at night and on Sunday. At two of these sites (including the Hongkong Stadium), the conditions stipulated in the Construction Noise Permits were found to be violated. As a result, we have cancelled the permits and are in the process of taking prosecution action against the offenders. STEVEN W. F. HO Principal Environmental Protection Officer for Director of Environmental Protection