PVS Chemical Solutions stored nearly half a million pounds of fuming sulfuric acid and almost a million pounds of toxic sulfur dioxide gas in the middle of Chicago — and the valves holding it all back were unlocked, the alarms were misconfigured, and the pipes hadn’t been inspected in at least five years.

The EPA showed up at 12260 South Carondolet Avenue on October 26 and 27, 2023, and what inspectors found was a facility running on the honor system. Valves left open. Alarms set at the wrong levels. Safety procedures that existed on paper but described equipment configurations that didn’t match reality. A Risk Management Plan that conveniently left out the full inventory of toxic chemicals stored on-site.

This is the story of a chemical company that failed ten separate federal safety requirements — and paid $174,000 ($174,000 — roughly the annual salary of one mid-level manager) to make it go away.

The people who live downwind of South Carondolet Avenue got nothing.

Ten Violations. One Settlement.

The Non-Financial Ledger

The cost that never makes the settlement

The Chemicals They’re Playing With

To understand what PVS Chemical Solutions represents to the people who live near South Carondolet Avenue, you first need to understand what’s in those tanks. Oleum — fuming sulfuric acid — is so corrosive it reacts violently with water, including the moisture in your lungs. Anhydrous sulfur dioxide is a toxic gas that causes severe respiratory damage even in small concentrations. Anhydrous ammonia, in a large-scale release, can kill within minutes. These aren’t hypothetical dangers. They’re the reason federal law created the Risk Management Plan requirement in the first place: because Congress recognized that a chemical plant in a populated area is a potential mass casualty event waiting for one failure to occur.

PVS Chemical Solutions held 968,400 pounds of oleum, 1,614,000 pounds of anhydrous sulfur dioxide, and 907,440 pounds of anhydrous ammonia in its three covered processes alone — and then stored additional rail car quantities on top of that, quantities it deliberately excluded from its federal filings. The rail cars alone held up to 404,800 pounds of oleum and 891,800 pounds of sulfur dioxide. That is over 3.7 million pounds of substances the EPA classifies as capable of causing death, injury, or serious adverse effects in an accidental release — sitting in a neighborhood, managed by a company that couldn’t be bothered to inspect its pipes.

The threshold quantities that trigger federal safety oversight are 10,000 pounds for oleum and ammonia, and 5,000 pounds for sulfur dioxide. PVS Chemical wasn’t exceeding those thresholds by a little. They were exceeding them by factors of 96, 322, and 90 respectively. The regulatory framework calls for extensive hazard analyses, maintained alarms, inspected pipes, and detailed emergency procedures precisely because that scale of chemical storage demands it. PVS Chemical gave regulators paperwork and called it safety.

The Valve That Could Have Ended a Neighborhood

When EPA inspectors arrived on October 27, 2023, they found something that should alarm every person who has ever driven past a chemical plant and assumed someone was watching. On the anhydrous ammonia feed piping to the Gassing Tank, there was an open-ended valve — in the open position — with only a single upstream valve, no lock, holding back the ammonia. One failure. One mechanical hiccup. One moment of inattention. That single closed upstream valve was the only barrier between the community and a toxic ammonia release. The EPA’s regulations exist specifically because this kind of single-point failure is how chemical disasters happen.

There was a second open-ended line on the ammonia feed system to the Digest Tank. PVS Chemical’s own written procedure — the “Normal Operations – Digest Tank Batch” document they handed inspectors — showed closed piping at that location. The actual piping configuration didn’t match. The procedure described a plant that didn’t exist. Either the procedure was never updated to reflect reality, or the procedure was written to show regulators what they wanted to see. Either way, the ammonia was held back by paperwork and good fortune, not engineered controls.

In the Sulfur Dioxide Process, inspectors found open-ended valves or lines that relied on a single closed valve with no lock to contain the gas. The company had conducted a five-year Process Hazard Analysis revalidation in 2019 and never evaluated the hazard of loss of containment through these open-ended lines at all. A recognized hazard, documented in industry standards, simply went unexamined. Not analyzed and dismissed. Not analyzed and accepted as low-risk. Just never analyzed. For an unknown number of years, that risk sat in the plant unacknowledged, while the neighborhood outside had no idea it existed.

The Alarms That Were Set Wrong — And Nobody Knew

The detail that should make everyone who lives near a chemical facility in this country lose sleep: PVS Chemical’s sulfur dioxide detection alarms were configured to trigger at the wrong concentration levels, and the company had no idea until the EPA sent a formal information request in April 2024. The error’s origin and duration are not specified in the EPA’s documents — meaning it could have existed for months or years before anyone caught it. The alarms that were supposed to warn operators of a toxic gas release were miscalibrated. The entire time PVS Chemical was operating under the assumption that its alarm system worked, that assumption was wrong.

The EPA’s regulations require more than just having alarms. They require documented alarm philosophies, alarm prioritization systems, testing protocols, and written procedures specifying exactly what levels trigger what responses. PVS Chemical had none of these things in any meaningful form. The 2019 hazard analysis team looked at questions about alarm prioritization and critical alarm distinction, answered “No. Not an issue” to both, and moved on — with no reference to any industry standard supporting that conclusion. When inspectors asked for operating procedures covering sulfur dioxide detector alarm response, emergency shutdown levels, and safe operating limits, those procedures didn’t exist. Workers responded to alarms — if those alarms functioned at all — without written guidance on what the alarms meant or what to do.

Five Years of Uninspected Pipes

The pipes carrying oleum and sulfur dioxide through the PVS Chemical facility had not been inspected or tested in at least five years — and possibly longer. When the EPA requested documentation of all piping inspections and tests from April 2019 through the April 2024 information request, PVS Chemical could not provide evidence that any had been performed. Industry standards require external visual inspections at minimum every five years and thickness measurements at least every ten. PVS Chemical’s own internal safety document, EHS-500, explicitly stated that inspection criteria must follow industry standards including API standards. The company wrote that requirement for itself and then ignored it.

Piping carrying corrosive chemicals like oleum and sulfur dioxide thins over time. It corrodes. It develops weak points. The entire purpose of mandatory piping inspection is to catch that deterioration before it becomes a rupture. Every year those pipes went uninspected was a year the company was flying blind, trusting that nothing had failed yet as evidence that nothing would fail. That is not safety management. That is luck management — and it is the kind of bet that, when it loses, loses catastrophically for everyone in the blast radius.

What’s Actually In Those Tanks