This license allows a person to line a tank system which has held or will hold flammable or combustible liquids. Obtaining an initial license applies to applicants seeking the credential for the first time, may be used as an option in lieu of the renewal requirements, and must be used by applicants wishing to re-obtain a credential which has been expired for more than one credential cycle.An examination is required for this credential.Administrative Rules/Codes: Tank system liners (Comm 5.86)(1) General. No person may line a tank system which has held or will hold flammable or combustible liquids unless:(a) The person holds a credential issued by the department as a certified tank system liner; or(b) The persons is under the direct supervision of another person who holds a credential issued by the department as a certified tank system liner. (2) Application for examination. A person applying to take a tank system liner certification examination shall submit all of the following:(a) An application in accordance with s. Comm 5.01.(b) An application fee and examination fee in accordance with s. Comm 5.02, Table 5.02. (3) Examination. A person seeking to obtain a tank system liner certification shall take and pass an examination in accordance with s. Comm 5.09. (4) Application for certification. Upon notification of successfully passing the examination for a tank system liner certification, a person may obtain the certification by submitting an application and the credential fee in accordance with ss. Comm 5.01 and 5.09 (7) (c). (5) Responsibilities. . A person who lines or supervises the lining of underground tanks as a certified tank system liner shall be present at the job site for at least all of the following activities: (a) Removal of product from the tanks and making the atmosphere of the tanks inert or vapor-free. Note: Chapter Comm 10 requires plan submittal and approval prior to lining a tank. (b) Cutting of openings in tanks. (c) Removal and handling of sludge and other wastes from tanks. (d) Sand blasting of the tank interior. (e) Inspection for holes and wall thickness. (f) Notifying the owner if an internal tank assessment determines that a tank system assessment under ch. Comm 10 is required. (g) Repair of holes. (h) Notifying and arranging for a certified tank system inspector to visit the site and authorize the lining, prior to applying the lining to the tank. (i) Coating of tanks. (j) Testing for holidays. (k) Testing for coating hardness. (L) Resealing of tanks. (m) Completing an API 1631 inspection form B, as required by ch. Comm 10, and submitting it to the owner, inspector and department. (6) Renewal. (a) A person may renew his or her certification as a tank system liner. (b) A tank system liner certification shall be renewed in accordance with s. Comm 5.07.