Page-cited permit extraction

Aligned Data Centers IAD03

Loudoun Co., Virginia

QA status Machine-extractedRelease dated July 29, 2026

EVIDENCE NOTE

What the public record says

A machine-extracted candidate of equipment groups and permit limits stated in Virginia DEQ permit 74247-1, 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. 1 ↗, p. 3 ↗.

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.

MACHINE-EXTRACTED CANDIDATE

Equipment and limits,
kept separate from actual use.

These page-cited rows are machine-extracted and still require a second manual review. Verify every reused value against the linked official PDF. Page numbers refer to the one-based position in the linked PDF. Blank values are not zero.

Permitted equipment

3 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
`1 through 48`	emergency engine generator setCaterpillar · C175-16 and/or Caterpillar 3516E	48 units3000 kW each	diesel fuel oil—	See operating-scope table—	p. 4 ↗Machine-extracted from an official document equipment table; column grouping requires second review.
`49 and 50`	emergency engine generator setCaterpillar · C32	2 units1000 kW each	diesel fuel oil—	See operating-scope table—	p. 4 ↗Machine-extracted from an official document equipment table; column grouping requires second review.
`Pollutant`	engine generator set—	1 unitsNo reliable per-unit rating transcribed	——	See operating-scope table—	p. 9 ↗Machine-extracted from an official document equipment table; column grouping requires second review.

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
`1 through 50`	32 hours/year	ss than or equal to 100, operation of each unit (which involves fuel combustion) shall be minimized to the maximum extent practical. (9VAC5-80-1180) 7. Operating Hours – Each emergency diesel engine gen-set (Ref. Nos. 1 through 50) shall not operate more than 32 hours per year for scheduled maintenance checks and readiness testing (Scheduled MCRT, as provided in Condition 3.c). Each emergency diesel engine gen-set (Ref. Nos. 1 through 50) shall not operate more than 500 hours per year for allMachine-extracted normative operating-hours statement; second review pending.	p. 7 ↗
`1 through 50`	500 hours/year	. Nos. 1 through 50) shall not operate more than 32 hours per year for scheduled maintenance checks and readiness testing (Scheduled MCRT, as provided in Condition 3.c). Each emergency diesel engine gen-set (Ref. Nos. 1 through 50) shall not operate more than 500 hours per year for all purposes (as provided in Condition 3) combined. The annual limits for hours of operation shall be calculated monthly as the sum of each consecutive 12-month period. Compliance for the consecutive 12-month periodMachine-extracted normative operating-hours statement; second review pending.	p. 7 ↗

Permitted emission limits

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

Inspect 23 transcribed limit rows

Reference	Pollutant	Limit	Basis / scope	Source
`Caterpillar C175-16 (Ref. Nos. 1 - 48)`	NOx as NO2—	58.51 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar 3516E (Ref. Nos. 1 - 48)`	NOx as NO2—	58.11 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C32 (Ref. Nos. 49 & 50)`	NOx as NO2—	19.52 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C175-16 (Ref. Nos. 1 - 48)`	NOx as NO2—	7.64 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar 3516E (Ref. Nos. 1 - 48)`	NOx as NO2—	11.62 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C32 (Ref. Nos. 49 & 50)`	NOx as NO2—	2.78 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C175-16 (Ref. Nos. 1 - 48)`	VOC—	0.85 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar 3516E (Ref. Nos. 1 - 48)`	VOC—	0.58 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C32 (Ref. Nos. 49 & 50)`	VOC—	0.34 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C175-16 (Ref. Nos. 1 - 48)`	PM10—	0.39 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar 3516E (Ref. Nos. 1 - 48)`	PM10—	0.74 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C32 (Ref. Nos. 49 & 50)`	PM10—	0.23 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C175-16 (Ref. Nos. 1 - 48)`	PM2.5—	0.39 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar 3516E (Ref. Nos. 1 - 48)`	PM2.5—	0.74 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Caterpillar C32 (Ref. Nos. 49 & 50)`	PM2.5—	0.23 lb/hrhourly	——	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`All Engine Gen-Sets (Ref. Nos. 1 - 50)`	NOx as NO2—	96.00 tpyannual	combined—	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`All Engine Gen-Sets (Ref. Nos. 1 - 50)`	NOx as NO2—	37.06 tpyannual	combined—	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`All Engine Gen-Sets (Ref. Nos. 1 - 50)`	VOC—	4.00 tpyannual	combined—	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`All Engine Gen-Sets (Ref. Nos. 1 - 50)`	PM10—	1.75 tpyannual	combined—	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`All Engine Gen-Sets (Ref. Nos. 1 - 50)`	PM2.5—	1.75 tpyannual	combined—	p. 9 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
	visible emissions—	5 percent opacityvisible	——	p. 10 ↗Machine-extracted from a page line in an older official PDF; literal context: (9VAC5-80-1180) 13. Visible Emission Limit – Visible emissions from each emergency diesel engine gen-set (Ref. Nos. 1 through 50) exhaust shall not exceed 5% opacity except during one (1) six- minute period in any one-hour in which visible emissions shall not exceed 10% opacity as
	visible emissions—	10 percent opacityvisible	——	p. 10 ↗Machine-extracted from a page line in an older official PDF; literal context: 13. Visible Emission Limit – Visible emissions from each emergency diesel engine gen-set (Ref. Nos. 1 through 50) exhaust shall not exceed 5% opacity except during one (1) six- minute period in any one-hour in which visible emissions shall not exceed 10% opacity as determined by EPA Method 9 (reference 40 CFR 60, Appendix A). This condition applies
	visible emissions—	20 percent opacityvisible	——	p. 10 ↗Machine-extracted from a page line in an older official PDF; literal context: During startup and shutdown, visible emissions from each emergency diesel engine gen-set shall not exceed 10% opacity except during one (1) six-minute period in any one-hour in which visible emissions shall not exceed 20% opacity as determined by EPA Method 9 (reference 40 CFR 60, Appendix A).

DOCUMENT HISTORY

What this document says it changes

permit to construct and operate

No superseded-document date is asserted beyond the cited source wording.

p. 1 ↗, p. 3 ↗

QA NOTES

Ambiguity stays visible

Machine-extracted candidate. Verify every reused value against the cited official PDF page.
Verify table column grouping and any alternative models.
Confirm whether the limit is per unit, combined, or limited to testing/maintenance.
Confirm multi-row and merged-column header association.
Older-PDF text fallback; verify row and unit alignment.

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