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I-- LZ 3 1 Part 1: General 1.0 The tank manufacturer shall supply a continuously mon- itored hydrostatic head pressure leak detection system. The system shall be designed by the manufacturer to detect a leak in either the primary tank or the secondary tank in either a wet or dry excavation. The system shall include: a brine solution (to prevent freezing) delivered to the job site in the interstice of the double-wall tank, a reservoir mounted on top of the tank to provide a liquid medium for monitoring, and an electronic monitoring system to sound an audible and visual alarm when the liquid level of the reservoir rises or falls to predetermined alarm points. The system shall also include an electronic sensing probe to monitor the attached collar riser for the submersible pump, if so specified. Part II: Standards 2.0 The double-wall tank with a brine -filled interstice shall be listed by Underwriters Laboratories (Uy. The electronic monitoring system used to monitor the liquid reservoir and the attached collar riser shall also be Listed by UL for intrinsic safety in a hazardous location. All equipment shall be installed in accordance with the manufacturers instructions and all applicable federal, state and local laws and regulations. Part III: Requirements for Liquid -Filled Double -Wall Tank 3.0 The interstice of the doubfe-wafl tank shall be filled with a brine solution. Tanks up through 30,000 gallons shall be delivered to the site with the brine solution in the interstice. The reservoir shall be constructed of fiberglass and mounted directly to the top of the tank. The reservoir shall be fitted with one 4" NPT fitting for installation of the electronic -reservoir probe. The reser- voir must remain vented at all times. Part PJ: Requirements for Electronic Monitoring System 4.0 The Controller The panel shall receive the signal from the reservoir and/or attached collar riser and provide for the following indications., 1. System normal 2. System fault (The "fault" indication must not be the same as the "alarm' indication.) 3. System leak alarm Also, a system test switch indicating the system is functional shall be provided. All alarms shall be both audible and visible. The unit shall be able to be reset. The control panel shall provide indication of which tank is in the alarm condition, if more than one tank is being monitored. The control panel shall be capable of monitoring up to eight probe points. The system shall provide intrinsic safety at the probe locations. 4.1 Reservoir Probe The probe shall be constructed of a material which is suitable for prolonged, complete immersion in the monitoring liquid. The monitoring liquid may be: salt brine (30°x6 CaCI in water. The probe shall detect and report a change in liquid level either above (high -alarm point) or below (low -alarm point) the neutral level established during the initial filling and subsequent maintenance of the system. The probe shall not operate by inducing an electrical current into the liquid medium that is being monitored. The sensing range represents a built-in allowance for pressure and thermal variation. Until the liquid level exceeds the allowable variation, the probe shall not send a signal to the monitor unit The probe shall be capable of being mounted in the reservoir in a manner that allows adjustment of location. The probe must be able to be mounted so that normal fluctuation of the liquid level does not interfere with the normal operation of the probe. The probe shall be capable of operating at a distance of 500' from the control panel. 4.2 Attached Collar Riser Probe (if applicable and shown on the drawing) The probe shall be constructed of a material that is suitable for prolonged, complete immersion in any of the fluids listed in Underwriters Laboratories (UL) Standard for Safety 1316, Table 14. 1, all columns. The probe shall detect the presence of liquid in the riser when the liquid level has risen to a maximum of one inch above the bottom of the probe, as located in its permanent mounting position. The permanent mount- ing ounting position is determined by the installer at the time of installation. The probe shall be capable of being mounted in the riser in a manner that allows adjustment of location. The probe shall be able to be mounted so that an increase in the liquid level does not interfere with the normal operation of the probe. The probe -mounting assembly supplied and installed by contractors shall provide protection for the probe from the operational activities that may take place within the riser. The probe shall be capable of operating at a distance of 500' from the control panel. 4.3 Operating Parameters: Temperature: 0° F to 150° F Voltage: 1 10 or 220 VAC, 50/60 Hz Part V: Performance 5.0 The continuous hydrostatic monitoring system, includ- ing the electronics and the probes, shall be capable of detecting and alarming when the liquid level in the tank reservoir rises or drops beyond the allowable variation. Part VI: Materials 6.0 The materials used in the monitoring system shall be corrosion -resistant to the liquid used to fill the interstice. Part VII: Installation 7.0 The monitoring system shall be installed in accordance with the manufacturer's Installation Manual and Operating Guidelines, and all applicable federal, state and local laws and regulations.