Wawa,Inc. Dairy, Warehouse & Distribution - Executive Summary
Wawa, Inc. Dairy, Warehouse, Distribution Facility RMP Summary |
The Wawa DWD facility is located at 1393 W. Baltimore Pike in Wawa, Delaware County, PA. The facility has been recently modernized and expanded. The facility refrigeration system is an anhydrous ammonia refrigeration system. The system provides cooling for processing activities, the milk cooler, the automated storage and retrieval system and for various tanks and silos.
The expansion and modernization has resulted in increased ammonia supply for dairy refrigeration. In line with OSHA's Process Safety Management standard and EPA's Risk Management Program regulation Wawa DWD has conducted a process hazard analysis to identify potential operability issues, minimize potential hazards and improve the safety and operability of the ammonia refrigeration system. As a result the various elements of the PSM standard have been reviewed, updated and implemented at the facility.
Operating procedures have been identified, revised
and are being implemented. Employee involvement is encouraged and a safety committee is in place to assist in addrsssing and enhancing safety and health. A contractor safety program has been instituted as well as a management of change and mechanical integrity program. Work permit systems have been established to help ensure work conducted on the ammonia refrigeration system is controlled. An incident investigation program includes investigation of incidents that would or could result in a catastrophic release of ammonia. The emergency response program addresses the means for repoprting emergencies, persons responsible for the plan, procedures for emergency responders and those operating critical equipment, the facility alarm system, evacuation procedures and a procedure for personnel accounting. A compliance audit program has also been established to evaluate the effectiveness of the program.
Wawa DWD has established a working and communication network with the Middletwn Towns
hip Fire Marshal in relation to emergency response issues. Township emergency response personnel have and will continue to tour the facility periodically and review potential release scenarios. In addition, Wawa DWD is an active member of the Delaware County LEPC.
The worst-case release scenario at the Wawa facility involve the release of 22,500 pounds of anhydrous ammonia over a 10-minute period due to failure of an ammonia receiver. The amount released reflects the amount of maximium ammonia that could be stored in the receiver during pump-down conditions. Under worst-case conditions, the resulting vapor cloud could have off-site consequences.
The alternate release scenario involves the release of 2,550 pounds of ammonia over a 15-minute period from a pressure relief valve associated with a storage silo. Under alternative release conditions, the resulting vapor cloud could have off-site consequences.
The worst-case and alternative release scenarios for toxic materials are unl
ikely for the following reasons:
The weather conditions that were used for the worst-case release scenario do not occur, while
those used in the alternative case are uncommon; industry standards are followed for the design
and manufacture of the equipment in the ammonia refrigeration system; the ammonia receiver is
located in an enclosed area that should help to contain any ammonia releases; the engine room
contains an ammonia detector and ventilation fans that should detect and mitigate the effects of any
ammonia release; the ammonia receiver is typically only half full during normal operations; ammonia
is not corrosove is this service; the facility has a preventive maintenance program in place to
maintain the ongoing integrity of the ammonia refrigeration equipment; the facility has a training
program designed to ensure that the system is operated by qualified personnel
; and the facility has
emergency reponse procedures that enable trained personnel to respond quickly to isolate any
One ammonia related incident has occurred at the facility in the previous five years that resulted in significant on-site or off-site environmental consequences.