Page-verified permit transcription

Amazon Data Services IAD-215

Loudoun County, Virginia

QA status VerifiedRelease dated July 29, 2026

EVIDENCE NOTE

What the public record says

A manually verified transcription of equipment groups and permit limits stated in Virginia DEQ permit 74252-2, with one-based PDF page citations. Permitted terms do not establish actual operation or emissions.

Primary sourceVirginia DEQ permit document

Virginia Department of Environmental Quality

Open original source ↗

Summary fields cite p. 3 ↗, p. 4 ↗.

What this record does not establish

The source confirms the document and its stated fields. This profile does not infer actual emissions, compliance history, operating status, facility capacity or environmental impact where those facts are not established by the cited document.

How to read the status

Issued means the agency granted the permit subject to its conditions. It does not mean every permitted unit is operating, that maximum permitted emissions occur, or that later amendments do not exist.

VERIFIED PERMIT TERMS

Equipment and limits,
kept separate from actual use.

This is a conservative transcription of reviewed permit sections, not an exhaustive legal digest. Page numbers refer to the one-based position in the linked PDF. Blank values are not zero.

Permitted equipment

4 document-defined equipment groups. Counts and per-unit ratings are transcribed; combined capacity is not calculated.

Reference	Equipment / model	Count / rating	Fuel / controls	Stated operating field	Source
`3,5,7,9,11,13,15,17,19,21`	emergency engine gen-setCaterpillar · 3516C-HD	10 units2500 kW each	diesel fuel oil unless noted in permitengine design / good operating practice	See operating-scope table—	p. 5 ↗
`1,2,4,6,8,10,12,14,16,18,20,22`	emergency engine gen-setCaterpillar · 3516C-HD	12 units2500 kW each	diesel fuel oil unless noted in permitengine design / good operating practice	See operating-scope table—	p. 5 ↗
`23`	emergency engine gen-setCaterpillar · C18	1 units600 kW each	diesel fuel oil unless noted in permitengine design / good operating practice	See operating-scope table—	p. 5 ↗
`T1 and T2`	emergency engine gen-setCaterpillar · 3516C	2 units2000 kW each	diesel fuel oil unless noted in permitengine design / good operating practice	See operating-scope table—	p. 5 ↗

Operating scope

Authorized hours, time windows or an explicit finding that no numeric annual-hour cap was located in the reviewed sections.

Reference	Limit	Basis	Source
`prior units 1,2,4,...,23,T1,T2`	32 hours/year per unit	scheduled MCRTCondition 7.	p. 8 ↗
`new units 3,5,7,...,21`	35 hours/year per unit	scheduled MCRTCondition 7.	p. 8 ↗
`1 through 23, T1 and T2`	500 hours/year per unit	all purposes; rolling consecutive 12 monthsCondition 7.	p. 8 ↗

Permitted emission limits

33 pollutant, unit-group and limit rows. These are permit terms, not measured or actual emissions.

Inspect 33 transcribed limit rows

Reference	Pollutant	Limit	Basis / scope	Source
`prior Caterpillar 3516C-HD`	NOx as NO2emergency	48.06 lb/hrhourly	per unitemergency operation	p. 10 ↗
`prior Caterpillar 3516C-HD`	COemergency	6.09 lb/hrhourly	per unitemergency operation	p. 10 ↗
`prior Caterpillar 3516C-HD`	VOCemergency	1.21 lb/hrhourly	per unitemergency operation	p. 10 ↗
`prior Caterpillar 3516C-HD`	PMemergency	0.4 lb/hrhourly	per unitemergency operation	p. 10 ↗
`prior Caterpillar 3516C-HD`	PM10emergency	0.4 lb/hrhourly	per unitemergency operation	p. 10 ↗
`prior Caterpillar 3516C-HD`	PM2.5emergency	0.4 lb/hrhourly	per unitemergency operation	p. 10 ↗
`new Caterpillar 3516C-HD`	NOx as NO2emergency	48.06 lb/hrhourly	per unitemergency operation	p. 10 ↗
`new Caterpillar 3516C-HD`	COemergency	6.09 lb/hrhourly	per unitemergency operation	p. 10 ↗
`new Caterpillar 3516C-HD`	VOCemergency	1.21 lb/hrhourly	per unitemergency operation	p. 10 ↗
`new Caterpillar 3516C-HD`	PMemergency	0.4 lb/hrhourly	per unitemergency operation	p. 10 ↗
`new Caterpillar 3516C-HD`	PM10emergency	0.4 lb/hrhourly	per unitemergency operation	p. 10 ↗
`new Caterpillar 3516C-HD`	PM2.5emergency	0.4 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar C18 / ref 23`	NOx as NO2emergency	9.58 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar C18 / ref 23`	COemergency	1.59 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar C18 / ref 23`	VOCemergency	0.32 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar C18 / ref 23`	PMemergency	0.11 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar C18 / ref 23`	PM10emergency	0.11 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar C18 / ref 23`	PM2.5emergency	0.11 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar 3516C / T1,T2`	NOx as NO2emergency	38.85 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar 3516C / T1,T2`	COemergency	3.95 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar 3516C / T1,T2`	VOCemergency	1.14 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar 3516C / T1,T2`	PMemergency	0.57 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar 3516C / T1,T2`	PM10emergency	0.57 lb/hrhourly	per unitemergency operation	p. 10 ↗
`Caterpillar 3516C / T1,T2`	PM2.5emergency	0.57 lb/hrhourly	per unitemergency operation	p. 10 ↗
`1 through 23, T1 and T2`	NOx as NO2all operations	96.04 tpyannual	all units combinedall purposes	p. 10 ↗
`1 through 23, T1 and T2`	COall operations	51.68 tpyannual	all units combinedall purposes	p. 10 ↗
`1 through 23, T1 and T2`	VOCall operations	11.18 tpyannual	all units combinedall purposes	p. 10 ↗
`1 through 23, T1 and T2`	PMall operations	3.97 tpyannual	all units combinedall purposes	p. 10 ↗
`1 through 23, T1 and T2`	PM10all operations	3.97 tpyannual	all units combinedall purposes	p. 10 ↗
`1 through 23, T1 and T2`	PM2.5all operations	3.97 tpyannual	all units combinedall purposes	p. 10 ↗
`1 through 23, T1 and T2`	visible emissionsstated opacity limit	5 percent opacityvisible	per exhaust/sourcenormal operation	p. 11 ↗
`1 through 23, T1 and T2`	visible emissionsstated opacity limit	10 percent opacityvisible	per exhaust/sourceone six-minute period in any one hour; also startup/shutdown baseline	p. 11 ↗
`1 through 23, T1 and T2`	visible emissionsstated opacity limit	20 percent opacityvisible	per exhaust/sourceone six-minute period in any one hour during startup/shutdown	p. 11 ↗

DOCUMENT HISTORY

What this document says it changes

combined minor NSR permit

Explicitly supersedes the document dated 2023-06-08.

p. 3 ↗, p. 4 ↗

QA NOTES

Ambiguity stays visible

Transcribed from exact official PDF; source page is 1-based PDF position.

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