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Executive Order G-70-164 Hasstech VCP-3A Phase II Vapor Recovery System Exhibit 3 STATIC PRESSURE INTEGRITY TEST UNDERGROUND STORAGE TANKS* 1. Applicability 1.1 This test procedure is used to quantify the vapor tightness of vapor recovery systems installed at any gasoline dispensing facility (GDF) equipped with pressure/vacuum (P/V) valves with designed pressure settings specified in Exhibit 1 of this Order. Excessive leaks in the vapor recovery system will increase the quantity of fugitive hydrocarbon emissions and lower the overall efficiencies of both the Phase I and Phase 11 vapor recovery systems. 2. Principle 2.1 The entire vapor recovery system is pressurized with nitrogen to two (2.0) inches H2O. The system pressure is then allowed to decay and the pressure after five (5) minutes is compared with an allowable value. The minimum allowable five-minute final pressure is based on the system ullage and pressure decay equations. For the purpose of compliance determination, this test shall be conducted after all back-filling, paving, and installation of all Phase I and Phase II components, including PN valves, has been completed. 2.2 For GDF equipped with a coaxial Phase I system this test shall be conducted at a Phase II vapor riser. For GDF which utilize a two-point Phase I system this test may be conducted at either a Phase 11 riser or a Phase I vapor coupler, provided that the criteria set forth in Section 6.8 have been met. If the integrity criteria for two-point systems specified in Section 6.8 are met, it is recommended that this test be conducted at the Phase I vapor coupler. 3. Range 3.1 If mechanical pressure gauges are employed, the full-scale range of the pressure gauges shall be 0-2.0, 0-1.0, and 0-0.50 inches H2O column. Maximum incremental graduations of the pressure gauge shall be 0.05 inches H2O and the minimum accuracy of the gauge shall be three percent of full scale. The minimum diameter of the pressure gauge face shall be 4 inches. 3.2 If an electronic pressure measuring device is used, the full-scale range of the device shall not exceed 0-10 inches H2O with a minimum accuracy of 0.5 percent of full-scale. A 0-20 inches H2O device may be used, provided the equivalent accuracy is not less than 0.25 percent of full scale. 3.3 The minimum and maximum total ullages shall be 500 and 25,000 gallons, respectively. These values are exclusive of all vapor piping volumes. 'Reference Bay Area Air Quality Management District Source Test Procedure ST-30