(a) The owner or operator of any portland cement dust dump will operate such dust dump in a manner which will minimize the horizontal dimensions of the working face.

(b) In cases where the dump is within 1,500 feet of any receptor, the owner and/or operator must seal the dust dump either by crusting or backfill twice yearly.

(c) If dumping procedures do not provide adequate protection from dust reentrainment, the owner and/or operator must install a windbreak. If visible emissions still reach the property line, the owner and/or operator must precondition the waste dust.