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-4- 0 <br /> After backfilling the vapor return and vent lines, the maximum pressure <br /> drop shall not exceed 0.5 inches WC at 60 cubic feet per our as <br /> determined by TP-201.4, Dynamic Backpressure. The pressure drop shall <br /> be measured from the dispenser riser to the UST with pressure/vacuum <br /> vent valves installed and with the poppeted Phase I vapor connection <br /> open. <br /> b. For existing installations, the maximum pressure drop through the system <br /> shall not exceed 0.5 inches WC at 60 cubic feet per hour as determined by <br /> TP-201.4, Dynamic Backpressure. The pressure drop shall be measured <br /> from the dispenser riser to the UST with the pressure/vacuum vent valves <br /> installed and with the poppeted has I 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 <br /> that at least two gallons of product are introduced into the system through <br /> each dispenser riser, prior tot test. <br /> 2. All vapor return lines shall have a minimum slope of 1/8 inch per foot from the <br /> dispenser riser tothe riser of the UST. A slope of 1/4 inch or more per foot is <br /> recommended wherever feasible. The or return path from any dispenser riser <br /> to the underground storage tank shall be free of liquid or fixed 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 sot any liquid inthe lines will drain toward the gasoline storage tank. <br /> The internal diameter of the connector, including all fittings, shall not be less than <br /> one-half inch (1/2"). <br /> Note: The dispenser-to-riser connection is defined as the piping connection <br /> between the outlet of the vacuum pump and the inlet of the dispenser <br /> riser. A vapor shear valve may also be part of the riser connection. <br /> 4. There is no length restriction for the vapor return piping oft system as long as <br /> the system complies with the maximum pressure drop requirement of It 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 11 EVIR System if there is a vapor line that is disconnected and open <br /> to the atmosphere. <br /> 6. No liquid condensate traps are allowed with this system. <br /> Healy Systems, Inc. Phase 11 EVIR System, Exhibit 2-VR-201-H <br />