Patent ID: 7494298

Claim:
A method for constructing a secondary containment area for above ground storage tanks, comprising the steps of: (a) providing a site for an above ground storage tank; (b) leveling said site; (c) laying a foundation bed on said site to form a first layer of material; (d) building a retaining barrier around said site; (e) covering said foundation bed and said retaining barrier with a liner cloth to form a second layer of material; (f) securing said liner cloth to said retaining barrier; (g) coating said liner cloth and said retaining barrier with at least one coat of polyurea to form a polyurea coating thickness of at least 30 mils, wherein said polyurea coating forms a third layer of material; and wherein said method result is in the formation of a solid, impermeable layer throughout the first, second and third layers of material.