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Unitized Systems -Engineerinle 0 Page 2 of 4 42,500 simply because that was all the concentrated weight available at the time of UL field testing. This load capacity is significantly more magnitude than can be expected by any typical canopy, even in the geographical areas subject to heavy snow loads. IL Impact Forces: The Tank is designed to withstand the impact of heavy vehicle on a canopy column which is connected to the PetroFirst Tank. The impact analysis was conducted following the design specification by the American Association of State Highway and Transportation Officials(AASHTO). The selected force/load criteria is based on a severe impact scenario, one that may occur however it is unlikely to occur at a service station facility given the type of traffic, speed, and controlled accessibility. (i.e. Heavy truck type vehicle, traveling at 30 Mph, striking the column at vehicle bumper height.) To further preclude the unlikely possibly of a larger impact force being transferred to the Tank, the column connection has a patented impact relief feature, which will allow a separation(disconnect) of the column connection bolts from the Tank if subjected to an impact of a larger magnitude than identified above. III. External Hydrostatic Pressure. The Tank is designed to withstand the hydrostatic effects on an empty tank which is completely submerged in water to a depth of 5 ft. over the top of the Tank. The analysis identifies the Tank can withstand this maximum hydraulic head pressure (13 ft.) when the Tank is structurally supported (internal stiffeners) at points not more than 35 ft. apart along the length of the Tank. In the case of the PetroFirst Tank, there are several points where additional internal stiffeners are placed to accommodate product compartments and/or column supports stiffeners,therefore distortion of the Tank, due to hydrostatic pressure, is not a significant design concern. IV. Stability Analysis: The Tank stability analysis identifies there is no potential for Tank overturning once installed underground and backfilled including the worst case loading condition when the Tank is subjected to loading in a eccentric application. T ,r It should be noted the design calculations were indeed conservative due to the fact the longitudinal trough on top of the PetroFirst Tank was not considered as a resistance to overturning. The trough in reality generates a significant resistance, acting similar to a key way on a shaft, which in this application will http://www.plasteel.com/pfeng.html 8/28/200