Vent pipe or fill port with no tank records

The site visit finds a vent pipe or a fill port at the subject property, and no registration, closure record or interview accounts for a tank. The pipe is a sign the standard tells the site visit to look for. It is not itself a tank or a release. Whether a recognized environmental condition (REC) goes with it depends on four things: whether a tank is or was there, what the tank held and whether a tank rule reached it, whether anything points to a release, and whether a tank still holding product poses a material threat.

What the answer turns on

The standard's storage tank item takes in vent pipes, fill pipes and access ways that indicate underground storage tanks (E1527-21, 9.4.12). A tank can bring in any of the three parts of the REC definition: a release, a likely release, or a material threat of a future one (E1527-21, 3.2.73). The standard's appendixes are nonmandatory.

Whether a tank is or was there. The body of the standard has the parts of an assessment work together, with the example of a past gasoline station in the records and a site visit that should watch for signs of a tank (E1527-21, 7.3.1). Here the sign came first, so the records and the interviews are asked what it served. The site visit identifies how the building is heated and with what fuel (E1527-21, 9.4.19): see heating oil tank at the subject property. Describe where each pipe stands and leads as far as can be seen; the site visit need not identify conditions under floors or behind walls (E1527-21, 9.2.4.2).
What the tank held, and whether a tank rule reached it. The standard's underground storage tank is any tank, with its connected underground piping, that holds or has held hazardous substances or petroleum products, with 10 percent or more of its volume below ground (E1527-21, 3.2.93). The federal tank rule (40 CFR part 280) is narrower. Its definition leaves out, among others, a "Farm or residential tank of 1,100 gallons or less capacity used for storing motor fuel for noncommercial purposes", a "Tank used for storing heating oil for consumptive use on the premises where stored", and a storage tank on or above the floor of a basement or other underground room with space to inspect it (40 CFR 280.12), and the rule excludes a system "whose capacity is 110 gallons or less" (40 CFR 280.10(b)(4)). Its notice duty reached systems "that were in the ground on or after May 8, 1986, unless taken out of operation on or before January 1, 1974" (40 CFR 280.22(a)). A tank in an excluded category, or one out of operation by the 1974 date, had no notice duty under that rule, and records are often incomplete (E1527-21, 8.1.3). A missing record does not show that no tank is there.
Whether anything points to a release. Odors and stained soil or pavement around the pipe are site visit features (E1527-21, 9.4.13, 9.4.23). Appendix X4 lists observations, data, documents and interviews as direct evidence of a release. Its note gives a bare steel underground tank installed decades ago with no leak detection as a possible example of a likely release, if the environmental professional believes one has likely occurred (E1527-21, X4.1).
A tank still holding product. A material threat is a threat that is obvious, that is likely to end in a release, and that the professional judges would likely affect public health or the environment (E1527-21, 3.2.52). The federal tank rule's closure sections bear on what may be in the ground; they are not the standard's measure of a threat. Where a covered system has been temporarily closed 3 months or longer, the rule has owners and operators "Leave vent lines open and functioning" and "Cap and secure all other lines, pumps, manways, and ancillary equipment" (40 CFR 280.70(b)). A covered tank taken out of service for good is emptied and cleaned and must "be removed from the ground, filled with an inert solid material, or closed in place in a manner approved by the implementing agency" (40 CFR 280.71(b)). The standard does not say what pipes left standing show about closure.

The records that bear on it

Registries and release lists. Registered tank lists are a standard source, searched for the subject property and adjoining properties (registered storage tanks; E1527-21, 8.2.2, Table 2). Check the leaking tank list too.
Local records. Local lists of registered storage tanks, from sources such as the fire department and the building permit office, are additional records the standard names (E1527-21, 8.2.4, Table 3).
Interviews and documents. Interview questions shall try to cover storage tanks and their pipes, past and present (E1527-21, 9.4.12, 10.2). The owner, key site manager and user are asked for tank registrations, site investigation reports and reports of any cleanup (E1527-21, 10.8.1).

What the federal rule says

On what an inquiry leaves open, the inquiry rule (40 CFR part 312) says:

The inquiry of the environmental professional should include an opinion regarding additional appropriate investigation, if any.

40 CFR 312.31(b), edition revised as of July 1, 2025

How it is written up

The pipes, and any tank identified, are described in the report (E1527-21, 9.4, 9.4.12). They become a finding when the professional judges they may indicate presence or likely presence at the subject property, and the opinion reasons for or against calling them a REC (E1527-21, 12.5, 12.6).

Where the professional concludes a release has occurred or is likely, the opinion gives the grounds: what points to a tank, what it held, what was observed, what the records and interviews hold. Unless judged a de minimis condition or a historical REC, the REC is listed in the Conclusions, and the professional should give an opinion on additional investigation, if any (E1527-21, 3.2.20, 3.2.39, 12.7, 12.8).

Where the professional concludes a tank's condition poses a material threat of a future release, the opinion says what was observed and why. That REC is listed in the Conclusions as well (E1527-21, 3.2.52, 3.2.73, 12.7).

Where the professional concludes neither, the opinion gives its reasoning on the same four facts (E1527-21, 12.6).

An interview with the key site manager, or a state or local agency official, may be what could not be held. Required information that good faith efforts could not obtain is a data gap, significant if it affects the ability to identify a REC: named in the Findings with the sources consulted, discussed in the Opinions and listed in the Conclusions (E1527-21, 3.2.19, 3.2.78, 12.5.1, 12.6.2, 12.7).

This page is general reference for environmental professionals. It does not classify any property. ASTM E1527-21 is the standard and is not reproduced here; the judgment of the environmental professional on the facts governs.