storefront clear of trash
if it spills into the public property, then there is a problem. if the trash is completely on the stores property, the market will likely take care of it.
require them to pay their employees
the deal worked out between the person selling labor and the person buying labor is between those parties, and not your / our / my business.
dump hazardous chemicals wherever
again, if the chemicals get off the property then we have a problem. if the chemicals stay on the property, not your / our / my problem.