Abstract
In Brazil there are approximately 35 thousand gas stations built in the 70s. With an average lifespan of 25 years for underground tanks, it is assumed that they are already committed. According to CETESB, the posts account for 63% of the contaminated areas in Sao Paulo, only 1 drop of lubricant oil pollutes 100 gallons of water. The Guarani aquifer, covering a total area of approximately …