Keeping CalARP Current: Ongoing Determinations Within Comprehensive Compliance Management
CalARP applicability is not a one-time question.
CalARP applicability is not a one-time question. A facility that was clearly under threshold three years ago can be over it today, and most of the time no one notices until an inspection by your CUPA (the local agency, often a fire department or county environmental health department, that administers the unified hazmat program) or a violation letter arrives. The chemical inventory grew. A new tank went in. A process changed. The thresholds did not move; the facility did.
The most common opening line we hear after one of those letters lands is “We thought we weren’t covered.” Usually the original determination was correct on the day it was done. It just stopped being correct.
This piece covers how CDMS handles that problem inside Comprehensive Compliance Management as an ongoing determination, and how it connects to the chemical inventory work and CERS reporting we already do for facilities on the program. For the broader picture, see our CalARP and Risk Management Plan compliance in California guide.
Why a One-Time Determination Is Not Enough
CalARP applicability hinges on three moving numbers: how much of a regulated substance is present, how it is distributed across processes, and the concentration or physical form on the SDS (Safety Data Sheet). All three change quietly during normal operations.
When we walk a facility, the inventory creep we find most often comes from one of these:
- A purchasing change. A switch from 55-gallon drums to a bulk tote, or from a tote to a stationary tank, can move a regulated chemical across a threshold without anyone treating it as a regulatory event.
- A process tie-in. Two storage vessels that were physically separate, and counted as two processes, get plumbed together during a layout change. Now they are one process, and the combined inventory is what the threshold test sees. The single-process rule is covered in Does your facility need a CalARP plan?
- A volume increase from a new customer or product line. Maximum on-site quantity climbs gradually. Each individual reorder looks routine. The aggregate effect crosses a threshold.
- A formulation or supplier change. A new SDS shows a different concentration of nitric acid, sulfuric acid, or aqueous ammonia. Some chemicals only count under specific concentration qualifiers. Same tank, same volume, different applicability outcome.
- A facility addition. A new refrigeration system, a second chlorine cylinder bank at a water plant, a new ammonia receiver. Equipment changes touch the threshold test in ways that paperwork changes do not.
None of these show up as a “CalARP event” on a compliance calendar. They show up on a purchase order, a P&ID (piping and instrumentation diagram) redline, or a CERS (the state’s online environmental reporting portal) update. If no one is looking at them through the CalARP lens, the determination drifts out of date.
What an Ongoing Determination Actually Checks
The Comprehensive Compliance Management team maintains the chemical inventory for facilities on the program, which means the data the CalARP test depends on is already on the system in current form. On each ongoing review, the determination compares that inventory against the Title 19 CCR §5130.6 lists of regulated substances and threshold quantities, and against the federal 40 CFR Part 68 lists. Three things get checked:
Maximum quantity in any one process.
Not the facility total. The threshold test only cares about the largest single process. We look at the configuration as it is now, not as it was on the last plan.
Concentration and form qualifiers.
Aqueous ammonia, nitric acid, sulfuric acid, hydrogen chloride, and several other regulated substances only trigger applicability above specific concentrations. SDS changes get flagged.
Process boundary changes.
New piping, removed isolation, relocations that bring previously separate vessels close enough to share a release scenario. These can collapse two processes into one and shift the threshold answer.
If the determination comes back negative, the result is documented and the chemical-inventory baseline is updated. If a chemical is approaching a threshold, the facility hears about it from CDMS, in writing, before it becomes a CUPA conversation. If the threshold is crossed, an applicability change kicks off a separate scope: a new plan, or an update to an existing one. The four CalARP service tiers (applicability determination, applicability letter, plan development or update, compliance audit) are covered in the pillar.
Triggers That Should Re-Open the Question
Even outside of Comprehensive Compliance Management, certain events should re-open the CalARP applicability question on their own. If any of these have happened at your facility since the last determination, the answer may have changed:
| Trigger | Why it matters |
|---|---|
| New tank, vessel, or piping installation | Changes maximum quantity in a process or merges two processes into one |
| Process tie-in or layout change | Same effect; common during refrigeration upgrades and water treatment expansions |
| New product line or customer volume | Pushes maximum on-site inventory upward over time |
| Supplier or formulation change | Different SDS concentration can move applicability in either direction |
| CERS update reflecting higher maximum quantities | Often the first written signal that the threshold check needs to be re-run |
| HMBP revision or HMBP/CERS resubmittal | Any reported quantity increase should prompt a CalARP recheck |
| A CUPA, fire department, or air district inspection | Inspectors increasingly cross-check HMBP/CERS data against CalARP applicability |
A maintained chemical inventory catches most of these. A standalone HMBP filing or a CERS update done without a CalARP review does not.
How This Connects to HMBP, CERS, and Your Chemical Inventory
For most California facilities, the same chemical data feeds multiple programs. The inventory drives the Hazardous Materials Business Plan (HMBP) and CERS reporting. The same inventory determines CalARP applicability. It also feeds Fire Code chemical hazard classification, the SPCC (Spill Prevention, Control, and Countermeasure) oil count, and several other programs.
The advantage of keeping one current chemical inventory inside Comprehensive Compliance Management is that a quantity change does not have to be entered into the CalARP determination separately. The number that moved on the HMBP is the same number the CalARP test reads. The same is true in reverse: a CalARP-relevant change to a tank size or a process configuration shows up on the HMBP and the CERS submittal in the same cycle.
For facilities already on Comprehensive Compliance Management, the ongoing CalARP determination is part of the program. CDMS does not prepare or update the CalARP plan itself as part of Comprehensive Compliance Management; if a plan or update is needed, it is scoped as a separate project. What Comprehensive Compliance Management does is make sure the determination underneath the plan stays accurate, and that you find out about a threshold crossing from your consultant rather than from a CUPA inspector.
What Happens If a Threshold Is Crossed
If the ongoing determination shows that a chemical or process has moved across a threshold, the next step is a scope conversation. Depending on what changed:
- New CalARP applicability with no prior plan. CDMS scopes a new plan at the appropriate program level. The pillar covers what that involves and what the client supplies versus what we assemble.
- A facility already covered, with a quantity or process change. The existing plan needs an update, not a full rewrite. Plan updates are also handled on the five-year renewal cycle in CalARP 5-year updates.
- Applicability is now in question but not confirmed. A standalone applicability review and written determination letter document the current evaluation and the rationale. The letter is useful evidence the next time the CUPA or fire department asks.
Either way, the time between “something changed” and “the plan reflects it” stays short. That is the difference between an ongoing determination and a periodic one.
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BSY started working with CDMS last year after our in-house EHS person departed the company. CDMS reviewed our existing operational permits as well as any additional Federal, State and Local regulations that could apply and helped us to create a comprehensive compliance calendar to track regulatory deadlines and submittal due dates. The CDMS team does an excellent job of tracking everything and can be relied upon to complete the forms accurately and assist with submittals, allowing me to focus on our business.
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