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ITEM #16 & 17 ' <r F i `as AUTOMATED MANUFACTURING PROCESS We use steel mandrels(cylindrical molds)to build our tanks from the inside out.The molds provide a firm and consistent ' surface upon which we apply materials to make our tank.The rotating mandrel and the application of the materials are controlled by a computer,custom designed to manufacture underground tanks.As the mandrel rotates;resin,glass and specially treated silica are precisely metered onto the mandrel from above. ' Tank thickness is determined with an instrument that magnetically senses the metal mold surface through the fiberglass reinforced plastic laminate.This method accurately measures the thickness of the laminate using specific ' points all over the surface of the tank wall and is more exact than the ultrasonic methods used by other manufacturers. The result is a closely controlled process and a very consistent tank wall composition providing uniform integrity. DIFFERENT PROCESS,BETTER RESULTS ' The inside-out approach to manufacturing tanks is a superior process with unique advantages.Inner Surface:The initial , material forming against the steel mold produces an incredibly polished finish,free of surface variations.The smooth inside surface in our process is not exposed to air as it cures thus eliminating air inhibited cure issues. The result is a well cured,high gloss inner surface without the need for interior liners.Other manufacturing methods rely on inferior hand ' sprayed wax coatings to combat surface cure problems. Outer Surface: Exterior stiffening ribs are applied in optimal locations and constructed of the most efficient reinforcing materials. We can also modify a tank by adding filament winding glass in tension,glass woven roving,glass mat,or any other materials in specific locations on the outside of the , tank wall.Our entire shell wall surface is manufactured with the same corrosion resistant resin.With our homogeneous tank shell,you can be assured the exterior surface has the same compatibility properties as the interior surface. We do not use liners or special coatings on any tank surface. ' Another important advantage of our inside-out manufacturing process is a consistent inner diameter. Using a mold as a frame insures a set dimension and capacity.If additional tank wall is necessary,we simply add thickness to the outside , surface.In contrast,an outside-in process by definition relies upon a fixed outer diameter and variable inner diameter.To add thickness using this process glass,resin and hand sprayed liners are applied to the inner surface sacrificing maximum tank capacity.Simply put,our process allows for a more versatile and dependable product. ' 3 MANUFACTURING PROCESSES t