PEPCON disaster

The Pacific Engineering and Production Company of Nevada (PEPCON) plant began operating in 1958 in the Henderson area southeast of Las Vegas. Clark County Fire Department historical material notes the site was attractive because of inexpensive hydroelectric power from Hoover Dam and the region’s dry climate, which simplified handling and storage of the product. PEPCON manufactured ammonium perchlorate (AP), an oxidizer used in solid-propellant rocket motors. The United States Fire Administration (USFA) described PEPCON as one of only two “free world” producers of ammonium perchlorate at the time, with the other producer located within Clark County, less than away. A contemporaneous federal case-study on defense industrial emergencies similarly emphasized the national impact, stating that the May 1988 disaster eliminated roughly half of U.S. ammonium perchlorate production capacity and forced allocations and recovery actions for defense and space users. The USFA reported the plant occupied roughly eight acres and included multiple buildings plus outdoor chemical storage and process areas; it had originally been constructed in the 1950s in an isolated desert area, though subsequent metropolitan growth reduced that isolation. By 1988, the facility sat in an unincorporated industrial “island” surrounded by the City of Henderson, in a region that had hosted defense-related industry since World War II. Nearby exposures included a large marshmallow factory within of the PEPCON site, while the closest residential and other commercial occupancies were roughly away. Estimates of the ammonium perchlorate inventory on site were substantial. The USFA reported approximately of finished product stored at the facility. Clark County Fire Department historical material likewise reported company estimates of roughly of ammonium perchlorate present at the time of the explosions. In addition to chemical hazards, the USFA noted that a high-pressure natural gas transmission line (about ) ran underneath the plant and supplied it through a pressure-reducing assembly. ==Fire and explosions==

Several theories have been advanced concerning the cause of the fire and explosions. The Clark County Fire Department (CCFD) in Clark County, Nevada, did not issue a formal report but did issue a two-page press release on July 15, 1988, describing what it believed to be the cause of the fire; this and other CCFD information was incorporated into a report by the United States Fire Administration (USFA). The United States Department of Labor (USDOL), working with the Division of Occupational Safety and Health (DOSH), issued a lengthy report on the accident that discounted the cause and origin findings of the CCFD. USDOL noted that the Arson Division of CCFD maintained control over the site for several weeks and that DOSH and PEPCON investigating teams were not permitted entry into the facility until 13 days after the event. USDOL reported that considerable evidence suggested that natural gas leaks were present in the plant. ==Fire department response==

The fire chief of the City of Henderson, who was leaving the main fire station about north of the PEPCON facility, spotted the huge smoke column and immediately ordered his units to the scene. As he approached the plant, he could see a massive white and orange fireball about in diameter and dozens of people fleeing the scene. At about 11:54, as he approached the site, the first of the two major explosions sent a shock wave that shattered the windows of his car and showered him and his passenger with glass. The driver of a heavily damaged vehicle coming away from the plant then advised the chief about the danger of subsequent larger explosions, which prompted the chief to turn around and head back toward his station. The other units also stopped heading toward the site after the explosion. The second major explosion nearly destroyed the chief's car; after he and his passenger were cut by flying glass, he was able to drive the damaged vehicle to a hospital. The windshields of a responding Henderson Fire Department vehicle were blown in, injuring the driver and firefighters with shattered glass. Several nearby fire departments responded to the accident. Clark County units staged from the scene and assisted injured firefighters. Recognizing the danger posed by a fire that was beyond their firefighting capabilities, they made no attempt to approach or fight the fire. ==Evacuation and overhaul of the scene==

The Henderson Police Department, Nevada Highway Patrol, Las Vegas Metropolitan Police Department and the Nevada National Guard evacuated a five-mile (8 km) radius around the plant, concentrating on areas downwind of the explosion. Roads in the area were clogged in both directions due to residents trying to leave and curious spectators headed toward the scene, creating a traffic jam that took over two hours to clear. More than an hour after the first explosions, authorities concluded that the airborne products could be a respiratory irritant; they were not considered highly toxic, nor was the danger of further explosions estimated as high. Authorities had considered expanding the evacuation zone to , but the idea was dropped due to the new information, although a few cases of respiratory irritation were reported in a small community about downwind. Crews in protective clothing headed to the scene to clean up, a slow process due to leaking tanks of anhydrous ammonia and residue from acids and other products. Several firefighters had to undergo treatment for respiratory irritation. Overhaul continued until dusk and resumed the following day. Authorities found the remains of Bruce Halker, the plant manager, but no trace of the other victim, controller Roy Westerfield, was ever found. Fifteen firefighters were injured. About four hours after the incident, hospitals were advised by the fire department that their disaster plans could be deactivated. ==Damage assessment and aftermath==

The explosions leveled the PEPCON plant and Kidd & Company marshmallow factory. Damage within a radius was severe, including destroyed cars, damage to buildings, and downed power lines. Damage to windows and moderate structure damage was recorded within of the incident. The damage reached a radius of up to , including shattered windows, doors blown off their hinges, cracked windows and injuries from flying glass and debris. At McCarran International Airport, away in Las Vegas, windows were cracked and doors were pushed open. The shock wave buffeted a Boeing 737 on final approach. PEPCON had only $1 million in stated liability insurance, but costs paid by its insurer significantly exceeded this amount. changed the name of the perchlorate chemicals manufacturing subsidiary to PEPCON Production, Inc and within one year, to Western Electrochemical Co. (WECCO). As of March 2023, the former PEPCON area has been redeveloped for commercial and institutional uses in the Gibson Springs/Warm Springs corridor near American Pacific Drive and Wigwam Parkway. Notable nearby facilities include Touro University Nevada (874 American Pacific Drive), Ocean Spray Cranberries LLC (1301 American Pacific Drive), and Graham Packaging / Continental Pet Technologies (875 American Pacific Drive), along with other large industrial/distribution tenants in the immediate area. ==In popular culture==

Footage of the explosion has been shown in the following disaster and survival-related documentary-reality television shows: • The third episode of Discovery Channel's Destroyed in Seconds, aired in August 2008. • An episode of Blueprint for Disaster features the explosion. • An episode of Shockwave features the explosion. • The TLC television special ''World's Most Powerful Explosions'' features the explosion. • The History Channel television special Engineering Disasters features the explosion. • Season 6 Episode 4 "Memphis Bridge of Doom" of Engineering Catastrophes features an analysis of the explosion and its cause. • In the video game Fallout: New Vegas, the fictional company REPCONN has its headquarters near the location of the disaster. ==See also==