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3.4.2 Abrasive blast fiberglass tanks to a minimum 1.5 to 2.0 mil anchor profile pattern or ground until fiberous material is fully exposed. 3.4.3 Once the abrasive blasting or grinding operation is completed,the entire surface area must be brushed, blown with compressed air and vacuumed. 3.4.4 Install a steel reinforcing plate under the fill pipe in the same manner employed when lining or repairing steel tanks. 3.5 Repair of Fiberglass Tanks 3.5.1 Use a minimum thickness of glass cloth and resin equal to the tank wall thickness to repair seams, cracks and holes, but not including buckling or flattening. 3.5.2 Fiberglass cloth and resin repair material shall include layers of 5-6 ounce fiberglass cloth or 24 ounce woven roving. 3.5.3 Roll out all fiberglass repairs to remove air bubbles and ensure that no exposed glass ends or unbonded edges remain. 3.5.4 Overlap the fiberglass repair material on all sides of the perforation by a minimum of six (6) inches. 3.5.5 When a seam leak is suspected, abrasive blast or grind all interior seams until fibrous material is fully exposed, troweled smooth and repair as described above. 3.5.6 Complete all repairs prior to lining the tank. 3.5.7 If a fiberglass tank is over 1% but less than 2% out of round, the tank must be structurally reinforced with lining material containing a minimum of 30%fiberglass reinforcement of one or more of the following: reinforcing mats, continuous strand (used with a fiberglass chopper), fabric ply construction, woven roving or some combination of these.The material property of the fiberglass and resin must have a minimum flexural strength of 27,000 psi. 3.6 Internal Lining of Fiberglass Tanks 3.6.1 Follow IECC's instructions and safety precautions during the handling and mixing of lining compounds, and applying to the entire interior surface of the tank following the specified method of application. 3.6.2 Internal linings must be a minimum of 100 mils thick and a nominal thickness of 125 mils or greater. 3.6.3 Cure lining thoroughly according to IECC's recommendations and test to determine hardness and thickness. 3.7 Closing the Entry on Fiberglass Tanks 3.7.1 After interior work is completed,abrasive blast or grind the cutout section of tank dome and all cut edges on the tank until all fibrous material is fully exposed. 3.7.2 Seal all cut edges of tank and cutout section with tank lining material prior to replacing the section of the tank. 3.7.3 Close entry area by replacing the cutout section previously removed. 2/99 Page 17 of 30