The 1979 Geraghty & Miller study, which was conducted for the U.S. Coast Guard, concluded that the area of the petroleum product contamination was approximately 55 acres beginning between Monitor Street and Kingsland Avenue (just south of Greenpoint Avenue), and extending southeast to the area of the Brooklyn-Queens Expressway. According to the study, the estimated volume of petroleum products underground Greenpoint was approximately 17 million gallons.
ExxonMobil uses a dual-pump recovery system to remove product. To date, more than 12.7 million gallons of petroleum product have been recovered, 3.5 billion gallons of water have been treated and over 15 miles of pipes have been removed.
A study released by the U.S. Environmental Protection Agency (EPA) in 2007 said that, “the continued use of dual-phase recovery as the primary remedial method is recommended.”
The amount of product recovered is reported on a quarterly basis to the New York State Department of Environmental Conservation (NYSDEC). ExxonMobil relies on multiple electronic measurement systems to ensure the accuracy of these reported results.
- An electronic meter installed in-line with the product pipe in the storage tank for each recovery well measures the amount of product as it is pumped out of the ground and flows into the tank. These meters measure and record pumped product in gallons.
- An electronic gauge continuously measures and records product volume in each recovery tank.
- When product is pumped out of recovery tanks at regular intervals for transport off-site to recycling facilities, additional measurements are taken for verification. Total volume in gallons removed from each tank is logged for verification by the receiver.