MARBLEHEAD – The $3 million clean-up of four landfill-contaminated properties on Stony Brook Road is scheduled for completion this week.Director of Public Health Andrew Petty said work on 52, 55, 56 and 57 Stony Brook Road is finally winding down this week.The project began Nov. 4 with a two-month clean-up and rehab at 52 Stony Brook Road, where four condominium owners temporarily vacated their homes so that Charter Environmental Inc., of Quincy, the low bidder, could do the work. That project finished Dec. 18.Earlier this year Charter workmen demolished the 57 Stony Brook Road home of Jeff Dinsmore, which the town purchased, and since then they have focused on contaminated portions of property at 55 and 56 Stony Brook Road, which the town also purchased.Purchases and an eight-month easement for the work at 52 Stony Brook Road were negotiated by Town Counsel Lisa Mead and former Director of Public Health Wayne Attridge.Contaminated soil and materials were removed from the sites and deposited at the town landfill, which is scheduled to be capped after the new transfer station is built.The company is on schedule to repave the street and do landscaping.”The seedings and plantings will close out Stony Brook Road,” Petty said. “It’s coming to an end.”