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0 4" 0 <br />OPW Double Fill Configuration shall be allowed for installation provided that no <br />more than two fill and two vapor return points are installed on any single <br />underground storage tank and that no offset of the vapor recovery riser pipe is <br />installed. An example of a OPW Dual Fill configuration in shown in Figure 2C. <br />2. The OPW Double Fill Configuration can also be used in the single fill mode if <br />applicable. However, if used in double fill configuration, two vapor return hoses <br />shall be connected to the dual fill configuration with at least one connection to <br />each cargo tank(s) used to simultaneously deliver gasoline through two product <br />hoses into a single tank. <br />Vapor Recovery Riser Offset <br />The vapor recovery tank riser may be offset from the tank connection to the vapor <br />recovery Spill Container provided that the maximum horizontal distance (offset <br />distance) does not exceed 20 inches. One example of an offset is shown in <br />Figure 2E. <br />2. The vapor recovery riser shall be offset up to 20 inches horizontal distance with <br />use of commercially available, 4 inch diameter steel pipe fittings. <br />Tank Gauge Port Components <br />The tank gauge adaptor and cap are paired. Therefore, an adaptor manufactured by <br />one company shall be used only with a cap manufactured by the same company. <br />Connections and Fittinas <br />All connections and fittings not specifically certified with an allowable leak rate shall not <br />leak. The absence of vapor leaks may be verified with the use of commercial liquid leak <br />detection solution (LDS) or by bagging, when the vapor containment space of the <br />underground storage tank is subjected to a non -zero gauge pressure. (Note: leak <br />detection solution will detect leaks only when positive gauge pressure exists). <br />Maintenance Records <br />Each GDF operator/owner shall keep records of maintenance performed at the facility. <br />Such record shall be maintained on site or in accordance with district requirements or <br />policies. The records shall include the maintenance or test date, repair date to correct <br />test failure, maintenance or test performed, affiliation, telephone number, and name of <br />individual conducting maintenance or test. An example of a Phase 1 Maintenance <br />Record is shown in Figure 2F. <br />Executive Order VR -102-E, OPW Phase I Vapor Recovery System, Exhibit 2, Page 4 <br />