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wall in all directions. The lining resin shall be Note: The above tank metal thicknesses are the worked completely into the fiberglass until the metal thickness requirements specified in UL - fiberglass is free of any entrapped air bubbles 58,table 3.1 and section 3.6. exceeding 1/8 inch in diameter. A10.4.5.6 Seams or joints repairs shall be Al 1.0 SURFACE PREPARATION continuously welded. For a description of joints see UL-58 Steel Underground Tanks, Section All.l Just prior to application of the lining, the 5.1. tank shall have a white metal finish<see SSPC- SP5 or s.s.s., a3 blast standards>, defined as a surface with a gray-white uniform metallic color, A10.4.5.7 Repaired areas shall be abrasive roughened to a minimum 2-1/2 to 4 mil anchor blasted to white metal in accordance with profile pattern. The surface, when viewed section All.0 and covered with fiberglass without magnification, shall be free of all oil, matting imbedded with resin extending at least grease, dirt, visible rust, scale, corrosion 6'beyond the perimeter of the repair. products, oxides, paint or other foreign matter (See figure 5.0). All procedures in section A9.0 shall be followed. Al 0.4.6 REPAIRS BY PLUGGING A10.4.6.1 Perforations not repaired in accordance with the weld repair procedures of A11.2 Abrasive blast cleaning operations for A10.4.5 shall be sealed using boiler plugs lining shall not be conducted on surfaces that and/or hydraulic cement. will be wet after blasting and before application of the lining material. When the surface is less than 5% above dew point, or when the relative A10.4.6.2 Hydraulic cement shall not overlap humidity of the air in the tank is greater than perforation(s) by more than 2 inches, nor 85%, abrasive blasting operations shall not be protrude up from the tank's interior surface performed. more than 2 inches. Al 1.3 Operating air pressure during abrasive blasting shall not be less than 90 PSIG and a A10.4.6.3 Areas to be sealed with boiler plugs minimum of 18 mesh-grit blasting media shall be and/or hydraulic cement shall be abrasive used to establish the minimum anchor profile blasted to white metal around the boiler plug pattern for the lining. and/or hydraulic cement for at least 12 inches in all directions. The boiler plug(s) and/or hydraulic cement shall be covered with lining resin and fiberglass chopped strand matting with A11.4 Prior to, or after, application of lining a minimum weight of 3 oz/ft or greater which is material, a minimum 7 gauge thick steel silane treated. The fiberglass and lining resin reinforcing plate, rolled to the contour of the shall extend from the outermost edge of the tank, and with minimum dimensions of eight boiler plug and/or hydraulic cement a minimum inches by eight inches shall be installed under of five inches and be bonded to the metal tank the fill(drop)tube(s)and gauging tube(s).The 21