The $225 million settlement between ExxonMobil and New Jersey reached this week confirms the oil giant must clean up more than 1,500 contaminated properties from gas stations to refineries - but exactly how much they'll spend or how long it'll take remains murky. Tuesday's settlement between New Jersey's Department of Environmental Protection and ExxonMobil is a payment for the public's loss of the use of land but the oil company is also required to clean up the sites, which include oil refineries in Bayonne and Linden, 16 other facilities and roughly 1,700 retail gas stations across New Jersey.