SPCC Impracticability Determination and Environmental Equivalence

When a facility subject to the SPCC rule cannot meet a standard containment requirement, federal regulations offer two separate escape routes, and choosing between an SPCC impracticability determination and environmental equivalence is not a matter of preference. Impracticability under 40 CFR 112.7(d) exists for one situation only: the facility physically cannot install secondary containment around bulk storage. Environmental equivalence under 40 CFR 112.7(a)(2) exists for a different situation: the facility wants to substitute an alternative method for other SPCC requirements that delivers the same level of environmental protection. The two provisions solve different problems, they carry different obligations, and they cannot be swapped. Using the wrong one is one of the most common compliance errors EPA inspectors catch, and the penalties reach $68,445 per day per violation.¹

The Hard Line Between the Two Pathways

The clearest way to keep them straight is by what each one touches. Environmental equivalence has an explicit boundary written into the regulation: it cannot be used to deviate from secondary containment requirements. That exclusion covers the general secondary containment provisions of 112.7(c), loading and unloading rack containment under 112.7(h)(1), and the sized containment rules for bulk storage containers at every facility type, including production facilities, drilling and workover sites, and animal fat and vegetable oil operations.²

If secondary containment is the problem, impracticability under 112.7(d) is the only option. If the deviation is from something else in the rule, such as an operational procedure, a transfer practice, or an equipment standard outside the containment requirements, equivalence is the tool. Attempting to use environmental equivalence to avoid building containment around a bulk storage tank is an error an inspector will spot immediately.³

When an Impracticability Determination Applies

Some sites simply cannot accommodate physical containment. A tank farm squeezed onto a narrow pier, an urban facility hemmed in by neighboring structures, a layout where berms would block emergency exits: these are the kinds of engineering realities that support a determination under 40 CFR 112.7(d).⁴

The word doing the work is “practicable,” and EPA reads it narrowly. The determination has to rest on genuine physical or safety constraints that make traditional containment impossible or unsafe to construct. Expense alone does not count. A facility that could technically install a dike system but finds it too costly or too disruptive cannot claim impracticability. The option has to be physically off the table. Regulators look for engineering impossibility, not economic inconvenience, and this is where facilities most often stumble.

The justification in the plan has to hold up on its own terms. A vague reference to “space limitations” is not enough. The plan needs to describe the physical constraints at that specific location, identify the containment methods that were evaluated, and explain why each one fails on site. Passive containment options like dikes, berms, and retaining walls are the gold standard because they work without human intervention, so the analysis needs to demonstrate that none of them can be built before turning to active measures or the impracticability route.⁵

What Impracticability Requires in Return

Claiming impracticability does not let a facility skip containment and move on. The regulation imposes three compensating obligations, and each one exists because the site has given up its physical safety net.

First, the facility must conduct periodic integrity testing of its bulk storage containers and periodic integrity and leak testing of the valves and piping. The reasoning is direct: if the site cannot catch a leak externally, the equipment itself has to be verified sound.⁴

Second, unless the facility has already submitted a response plan under 40 CFR 112.20, it must include an oil spill contingency plan in its SPCC plan that follows the framework at 40 CFR Part 109. That contingency plan is the actionable roadmap for responding to a discharge the facility cannot physically stop.⁶

Third, the plan must include a written commitment of the manpower, equipment, and materials required to quickly control and remove any discharged oil. This commitment functions as a guarantee that the absence of physical barriers is offset by the ability to respond fast and effectively. Read together, the three requirements trade one form of protection (walls and berms) for another (vigilant monitoring, sound equipment, and a documented response capability).

When Environmental Equivalence Applies

Environmental equivalence under 40 CFR 112.7(a)(2) is a different tool for a different problem. Where impracticability says “we cannot install standard containment,” equivalence says “we have a substitute that works just as well.” The provision lets a facility deviate from specific SPCC requirements covering operational procedures, transfer practices, and certain equipment standards, provided the alternative delivers equal environmental protection.⁴

Common examples include replacing a manual inspection protocol with continuous electronic monitoring backed by automatic shut-off valves, or swapping a standard drainage configuration for a more effective engineered design. The substitute has to deliver genuine equivalence, not a plausible approximation. The plan must describe each deviation, explain why the alternative was chosen, and detail how it achieves the same protective outcome as the standard requirement.⁷

Honest analysis matters. The plan needs to show how the substitute performs under different failure scenarios. An alternative that looks good on paper but falls apart during a power outage or a heavy storm does not meet the standard, and an equivalence claim that does not hold up under inspection can result in enforcement action.

Professional Engineer Certification for Both Pathways

Both routes require a licensed Professional Engineer’s certification. Under 40 CFR 112.3(d), the PE attests that they are familiar with the SPCC requirements, that they or their agent have personally visited and examined the facility, that the plan follows good engineering practice and applicable industry standards, and that inspection and testing procedures have been established.⁸

Without that certification, a plan that deviates from standard requirements is invalid, which means the facility is operating out of compliance no matter how sound the engineering behind the deviation may be. An engineer who falsely certifies a plan faces license revocation and potential criminal liability for making false statements to the federal government.

The certification requirement reaches even into the world of smaller facilities that would otherwise self-certify. A Tier II qualified facility can self-certify most of its plan, but if it uses environmental equivalence deviations or claims impracticability for secondary containment, a Professional Engineer must review and certify those specific portions. EPA calls the result a “hybrid plan.”⁹ Neither pathway is available on a self-certified basis alone.

Common Mistakes and What They Cost

Two errors show up repeatedly. The first is claiming impracticability based on cost or disruption rather than physical impossibility. The regulation does not accept that reasoning, and an inspector reviewing the PE’s justification will look for concrete engineering constraints tied to the specific site. The second is reaching for environmental equivalence to avoid secondary containment. The rule excludes that use explicitly, and no amount of alternative-method documentation cures the exclusion.

Either mistake exposes the facility to civil penalties of up to $68,445 per day per violation.¹ Because SPCC violations are typically continuing rather than one-time events, the daily penalty accrues over the entire period the invalid plan has been in effect. The cost of doing the analysis correctly, with a PE who understands the distinction between the two provisions, is trivial by comparison.

The practical takeaway is a discipline about scope. Before drafting any deviation, identify the specific SPCC section the facility cannot comply with. If it is a secondary containment section, the analysis belongs under 112.7(d) and must satisfy all three of the compensating obligations. If it is any other section, the analysis belongs under 112.7(a)(2) and must demonstrate genuine equivalence. The two pathways are not interchangeable, and the plan should never blur them.

1
eCFR. 40 CFR 19.4 – Statutory Civil Monetary Penalties, as Adjusted for Inflation, and Tables
2
eCFR. 40 CFR 112.7 – General Requirements for Spill Prevention, Control, and Countermeasure Plans
3
U.S. Environmental Protection Agency. SPCC Guidance for Regional Inspectors – Chapter 3: Environmental Equivalence
4
eCFR. 40 CFR 112.7 – General Requirements for Spill Prevention, Control, and Countermeasure Plans
5
U.S. Environmental Protection Agency. SPCC Guidance for Regional Inspectors – Chapter 4: Secondary Containment and Impracticability
6
eCFR. 40 CFR Part 109 – Criteria for State, Local and Regional Oil Removal Contingency Plans
7
eCFR. 40 CFR 112.7 – General Requirements for Spill Prevention, Control, and Countermeasure Plans – Section (a)
8
eCFR. 40 CFR 112.3 – Requirement to Prepare and Implement a Spill Prevention, Control, and Countermeasure Plan
9
Environmental Protection Agency. SPCC Qualified Facility Fact Sheet