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r..,_. Hydrostatic *k Normal Conditions Monitoring—For The reservoir liquid level will Concrete Optional Reservoir be stable if both the inner and Maximum Performance Liquid Level Sensor Traffic outer tank are tight. In Double-Wall Tank Pad Stable Reservoir Leak Detection . . .And Liquid Level Precision Tank Testing The optional reservoir sensor will activate an alarm if the "" ... Stored reservoir drains or overfills. Product `Double-Wall Underground Tank Inner Wail Breach Monitor fluid drains into the primary tank causing the Reservoir reservoir to drain. No f C sins petroleum product escapes Background from the primary tank to OIC TANKS recommends the pollute the site. Hydrostatic Tank Monitor for double-wall tank monitoring ' r because of its superior leak neer detection capability. By filling Wall the cavity between the inner Breach and outer tank walls with a liquid, hydrostatic pressure is continuously applied to both the primary and secondary Outer Wall Breach tank. This pressure is capable If the groundwater is below of detecting tank leaks in either the tank top, the monitor fluid the primary or secondary drains into the ground causing tank walls for all installed Groundwater the reservoir to drain. circumstances. Level The Hydrostatic Tank Monitor i can also serve the dual func- tion of a precision tank test. low ± Because the hydrostatic pres- st sure is continuous, this tank Breach testing method is less prone to potential false readings caused by minute changes in product temperature, tank If the groundwater is over the deflection under loads, or tank top, the reservoir will human error. overfill with groundwater and ' �Grrouulndwater activate the high level alarm The Hydrostatic Tank Monitor has been independently tested Rese veservoolr ;; on the reservoir sensor. and statistically validated to meet the National Fire Protec- tion Association's criteria as a precision tank test.This device is capable of detecting leaks k �.; as small as 0.05 gallons per : Outer Tank hour with a 95% probability of 'Breach detection and a 5% probability of a false alarm. [[[ All of the Fiberglas double- ■ wall tanks in this catalog include the "built-in" hydrostatic tank monitor as a standard feature.