Closure of Underground Petroleum Storage TanksAPI RECOMMENDED PRACTICE 1604THIRD EDITION, MARCH 1996REAFFIRMED, DECEMBER 2010Closure of Underground Petroleum Storage TanksManufacturing, Distribution and Marketing DepartmentAPI RECOMMENDED PRACTICE 1604THIRD EDITION, MARCH 1996REAFFIRMED, DECEMBER 20107/99XXAdditional copies available from API Publications and Distribution:(202) 682-8375Information about API Publications, Programs and Servicesis available on the World Wide Web at: http:/www.api.orgOrder No. A16043