The Mojave Desert Air Quality Management District (MDAQMD) is implementing amendments to Rule 461 - Gasoline Transfer and Dispensing, Rule 462 - Organic Liquid Loading, and Rule 463 - Storage of Organic Liquids. Rule 461 has been updated to contain up-to-date testing requirements, Phase I & Phase II vapor recovery system requirements, non-retail ORVR exemption for vehicle fleets, mobile fueler capacity, spillbox installation requirements, out of order guidelines, self-compliance requirements, record keeping, and testing requirements. Facilities that transfer gasoline into or from any stationary tank greater than 251 gallons or any mobile tank greater than 120 gallons should familiarize themselves with the proposed amendments.

Rule 462 has been updated to prohibit Class A facilities from loading organic liquids unless they are equipped with a California Air Resources Board certified vapor recovery system or MDAQMD approved vapor recovery system. The vapor recovery system must reduce emission of VOCs to 0.08 lbs or less per thousand gallons of organic liquid transferred. As part of the rule updates, MDAQMD included new leak inspection requirements for both Class A and B facilities. Any facilities that load organic liquids and qualify as a Class A or B facility should familiarize themselves with the proposed inspection and vapor recovery system requirements.

Rule 463 has been updated to lower the allowable true vapor pressure from 77.5 mmHg to 25.8 mmHg in any organic liquid storage tank with a capacity of 39,360 gallons or greater. Clarification regarding self-inspection and maintenance requirements for organic liquid storage tanks are also included. Facilities that have large organic liquid storage tanks should check their tank's true vapor pressure in the internal vapor space to ensure that they will be complying with the proposed amendments.

For more information about the details and impact of these changes, please contact our office at (949) 567-9880 or visit the District's website here.