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-4- 0 <br /> pressure/vacuum vent valves installed and with the poppeted Phase I <br /> vapor connection open. <br /> b. For existing installations, the maximum pressure drop through the system <br /> shall not exceed 0.5 inches WC at 60 standard cubic feet per hour as <br /> determined by TP-201.4, Dynamic Backpressure. The pressure drop shall <br /> be measured from the dispenser riser to the UST with the <br /> pressure/vacuum vent valves installed and with the poppeted Phase I <br /> vapor connection open. <br /> Note: The V/L test from Exhibit 5 may be used to verify proper operation of the <br /> system, in lieu of measuring the pressure drop through the lines, provided that at <br /> least two gallons of product are introduced into the system through each <br /> dispenser riser, prior to the test. <br /> 2. All vapor return lines shall have a minimum slope of 1/8 inch per foot from the <br /> dispenser riser to the riser of the UST. A slope of 1/4 inch or more per foot is <br /> recommended wherever feasible. The vapor return path from any fueling point to <br /> the underground storage tank shall be free of liquid blockage. <br /> 3. The dispenser shall be connected to the riser with either flexible or rigid material <br /> that is listed for use with gasoline. The dispenser-to-riser connection shall be <br /> installed so that any liquid in the lines will drain toward the storage tank. The <br /> internal diameter of the connector, including all fittings, shall not be less than <br /> one-half inch (1/2"). <br /> 4. There is no length restriction for the vapor return piping of the system as long as <br /> the system complies with the maximum pressure drop requirement of Item 1 (or <br /> the V/L option). <br /> 5. No product shall be dispensed from any fueling point at a GDF installed with the <br /> Healy Phase II EVR System Including Veeder-Root ISD if there is a vapor line <br /> that is disconnected and open to the atmosphere. <br /> 6. No liquid condensate traps are allowed with this system. <br /> Dispenser Vapor Piping <br /> 1. Any dispenser with a dispenser piping test valve in the closed position shall be <br /> considered a defect. <br /> In-Station Diagnostics <br /> 1. The gasoline dispensing facility operator/owner is advised to follow Districts <br /> requirements, if any, following a warning by the Veeder-Root In-Station <br /> Healy Phase 11 EVR System Including Veeder-Root ISD, Exhibit 2—VR-202-A <br />