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ITEM #16 & 17 DOUBLE-WALL TANKS ' CSI's advanced double-wall technology gives storage tank owners,municipalities,counties,provinces,and states proven protection against petroleum contamination of underground water supplies. In addition to our UL listing, our tanks ' comply with the EPA's recommendation for secondary containment systems wherever underground tanks are located near underground water supplies. Containment Solutions double-wall tanks give you two levels of protection,so you have twice the assurance and twice ' the risk management that any single-wall tank can offer.The primary tank is designed to contain your fuel.In the unlikely event that there is a breach in this wall,the secondary wall is designed to contain your product and prevent seepage into ' the environment. HYDROSTATIC MONITORING , For the most effective double-wall storage tank protection,we recommend hydrostatic monitoring.The cavity between the inner and outer tank walls(interstitial space),as well as a factory mounted reservoir,is filled with a non-toxic colored ' brine solution.Hydrostatic pressure is continuously applied to the interstitial space,enabling monitoring of the primary and secondary tanks.An electronic sensor in the tank reservoir will send an alarm if the brine level changes beyond a predetermined level. ' The CSI Hydrostatic Monitoring System offers a leak detection capability superior to other methods because of our unique tank construction.The independent tank wall design ensures that 100%of the primary and secondary tank walls are in contact with monitoring fluid.This open environment allows brine to move freely through the interstitial space, ' unimpeded by glass fabric bonded to the tank walls typically used in competitive designs.Since the unblocked interstitial space does not hinder communication,the CSI Hydrostatic Monitoring System is fast and effective. NORMAL • • • The reservoir liquid level will be stable if both the inner and outer Monitorfluid drains into the primary tank causing the tank are tight.The reservoir sensor will activate an alarm if the reservoir to drain.The petroleum product remains safely reservoir drains or overfills. contained in the primary tank. Concrete Traffic Pad Reservoir Liquid Reservoir Drains ' Level Sensor Inner Wall Breac Stable Reservoir ' Liquid Level Stored Product ' 5 DOUBLE-WALL STORAGE TANKS '