According to the Maricopa County Air Pollution Control Regulations Rule 352, "Gasoline Cargo Tank Testing and Use", states that all gasoline delivery vessels must be designed and maintained to be vapor tight and leak free. To comply with this requirement, a gasoline delivery vessel must pass the Maricopa County Pressure Test before delivering or unloading gasoline, and must pass the test each year thereafter.
All testing done within Maricopa County must comply with Rule 352, Section 401.1 concerning notification of test time and date. Notification of testing can be done through the online notification form.
Maricopa County Pressure Test
The Maricopa County Pressure Test consists of three subtests:
Positive Pressure Subtest
Vapor Valve Subtest
Partial Vacuum Subtest
The vessel must pass all three subtests, in the order presented, in the same testing period. See Rule 352 for details of testing procedures and parameters.
Application for Vapor Recovery Certification
Details and results from each subtest shall be entered onto the Tank Truck Leak Certification Checklist (PDF), which is then submitted with a complete application to the Air Quality Department. A complete application consists of:
The decal that certifies test completion will be issued by the Control Officer usually within three business days of receipt of a complete application. The expiration date of the issued decal is dependent on the testing date. Refer to Section 401.3 for expiration dates.