6004.3.2.1.1 Distance Limitation to Exposures
Outdoor storage or use of highly toxic or toxic compressed gases shall not be located within 75 feet (22 860 mm) of a lot line, public street, public alley, public way, exit discharge or building not associated with the manufacture or distribution of such gases, unless all of the following conditions are met:
- Storage is shielded by a 2-hour fire barrier that interrupts the line of sight between the storage and the exposure.
- The 2-hour fire barrier shall be located not less than 5 feet (1524 mm) from any exposure.
- The 2-hour fire barrier shall not have more than two sides at approximately 90-degree (1.57 rad) directions, or three sides with connecting angles of approximately 135 degrees (2.36 rad).