Interior Cleanup. After completion of the removal, replacement, encapsulation, or reversal involved in an abatement project, the contractor shall: Deposit all lead waste, including sealing tape, plastic sheeting, mop heads, sponges, filters, and disposable clothing in double plastic bags of at least 4 mils thick, or single bags 6 mils thick, and seal the bags; Before washing as required in §A(3), vacuum-clean all surfaces in the work area including woodwork, walls, windows, window wells, and floors with a HEPA vacuum; After vacuum-cleaning as required in §A(2), wet wash all surfaces in the work area including woodwork, walls, windows, window wells, ceilings and floors with a solution containing at least 1 ounce of 5 percent trisodium phosphate to each gallon of water; and After washing as required by §A(3), vacuum-clean all surfaces, after they have dried, as described in §A(2), with a HEPA vacuum until no visible residue remains. Exterior Cleanup. After completion of the replacement, removal, encapsulation, or reversal involved in an exterior abatement project, the contractor shall: Recover all visible debris from all exterior areas; Vacuum all porches treated; Wet wash all surfaces in the work area, including woodwork, windows, window wells, and floors with a solution containing at least 1 ounce of 5 percent trisodium phosphate to each gallon of water. Except as provided in §F, after the cleaning outlined in §§A and B, after a satisfactory inspection under Regulation .12B, every contractor shall repaint with a paint containing not more than 0.06 percent lead in the dried solid, or recoat all surfaces treated, except those encapsulated surfaces which have smooth easily cleanable factory-finished surfaces. Before repainting or recoating under §C, each contractor shall notify the Department that the cleanup required under §§A and B is completed, and shall undergo any inspection required by Regulation .12B. After painting or coating as required under §C, the contractor shall repeat the cleaning process set forth in §A in all interior work areas. After completion of the cleaning required under §E, the contractor shall seal all floors in interior work areas with: Polyurethane; Gloss deck enamel; A tight fitting vinyl floor covering; or An equivalent impermeable material, if a smooth, cleanable surface is not already present. In owner-occupied dwellings in which a lead abatement project is being done by the owner and not by a hired contractor, after completion of the replacement, removal, encapsulation, or reversal involved in a lead abatement project, the owner may, instead of following the cleanup procedures set forth in §A: Deposit all waste, including sealing tape, plastic sheeting, mop heads, sponges, filters, and disposable clothing, in double plastic bags at least 4 mils thick, or single plastic bags at least 6 mils thick, and seal the bags; Wet wash all surfaces in the work area, including woodwork, walls, windows, window wells, and floors with a solution containing at least 1 ounce of 5 percent trisodium phosphate to each gallon of water, twice, and Wet vacuum-clean all surfaces in the work area, including woodwork, walls, windows, window wells, and floors while surfaces are still wet. Alternative Procedures. The Department may on a case-by-case basis allow an alternative procedure for cleanup of a lead abatement project, provided that the owner or contractor who uses this procedure shall submit to the Department a written description of the alternative procedure which demonstrates to the satisfaction of the Department that the proposed alternative procedure provides the equivalent degree of dust removal.