Surely you have reported this type of activity to the EPD?
https://epic.epd.gov.hk/EPICCOM/gene...laint/?lang=en
Oh dear. This does sound a little feeble. Given most of the site will be excavated for underground car parks it really is just a need to working out what to do with the couple of feet of mildly oil contaminated soil. If you believe this is the reason agricultural land used as near free commercial land is not targeted for housing then that is fine but again it is explicitly at odds with popular press and general consensus in society....