Page-cited permit extraction

Aerospace Data Facility - East

Fairfax Co., Virginia

QA status Machine-extractedRelease dated July 29, 2026

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EVIDENCE NOTE

What the public record says

A machine-extracted candidate of equipment groups and permit limits stated in Virginia DEQ permit 74154-5, 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

1 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
`EG-74 through EG-80`	emergency engine generator setCaterpillar · C175- 16	7 units2725 kW each	diesel fuel oilselective catalytic reduction (SCR); diesel oxidation catalyst; oxidation catalyst	See operating-scope table—	p. 5 ↗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
`EG-13 through EG-22 and EG-70 through EG-73`	500 hours/year	ADF-E Registration Number: 74154 March 2, 2026 Page 9 13. Operating Hours - Each individual emergency diesel engine gen-set (Ref. Nos. EG-13 through EG-22 and EG-70 through EG-73) shall not operate more than 500 hours per year for all purposes (as provided in Condition 10) 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 perioMachine-extracted normative operating-hours statement; second review pending.	p. 11 ↗
`EG-74 through EG-80`	500 hours/year	most recently completed calendar month to the individual monthly totals for the preceding 11 months. (9VAC5-80-1180) [2/21/2023] 14. Operating Hours - Each individual emergency diesel engine gen-set (Ref. Nos. EG-74 through EG-80) shall not operate more than 500 hours per year for all purposes (as provided in Condition 11) combined. The emergency diesel engine gen-sets (Ref. Nos. EG-74 through EG-80) combined shall not operate more than: 200 hours per year without the SCR operating and 1,800Machine-extracted normative operating-hours statement; second review pending.	p. 11 ↗
`EG-74 through EG-80`	200 hours/year	l engine gen-set (Ref. Nos. EG-74 through EG-80) shall not operate more than 500 hours per year for all purposes (as provided in Condition 11) combined. The emergency diesel engine gen-sets (Ref. Nos. EG-74 through EG-80) combined shall not operate more than: 200 hours per year without the SCR operating and 1,800 hours per year with the SCR operating The annual limits for hours of operation shall be calculated monthly as the sum of each consecutive 12-month period. Compliance for the consecutiMachine-extracted normative operating-hours statement; second review pending.	p. 11 ↗
`EG-74 through EG-80`	800 hours/year	all not operate more than 500 hours per year for all purposes (as provided in Condition 11) combined. The emergency diesel engine gen-sets (Ref. Nos. EG-74 through EG-80) combined shall not operate more than: 200 hours per year without the SCR operating and 1,800 hours per year with the SCR operating 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 period shall be demonstrated monthly byMachine-extracted normative operating-hours statement; second review pending.	p. 11 ↗

Permitted emission limits

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

Inspect 26 transcribed limit rows

Reference	Pollutant	Limit	Basis / scope	Source
`Ref. Nos. EG-13 through EG-22`	NOx as NO2—	51.2 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-70 through EG-73`	NOx as NO2—	34.2 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22`	NOx as NO2—	12.4 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-70 through EG-73`	NOx as NO2—	2.9 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22`	VOC—	1.5 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-70 through EG-73`	VOC—	1.2 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22`	PM10—	1.7 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-70 through EG-73`	PM10—	0.8 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22`	PM2.5—	1.7 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-70 through EG-73`	PM2.5—	0.8 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 Uncontrolled`	NOx as NO2uncontrolled	57.43 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Controlled with SCR`	NOx as NO2controlled	6.55 lb/hrhourly	——	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 Uncontrolled`	NOx as NO2uncontrolled	0.97 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 Uncontrolled`	VOCuncontrolled	0.42 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 Uncontrolled`	PM10uncontrolled	0.17 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 Uncontrolled`	PM2.5uncontrolled	0.17 lb/hrhourly	per unit—	p. 13 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22 and EG-70 through EG-73 (All Units Combined)`	NOx as NO2—	54.7 tpyannual	combined—	p. 14 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22 and EG-70 through EG-73 (All Units Combined)`	NOx as NO2—	13.3 tpyannual	combined—	p. 14 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22 and EG-70 through EG-73 (All Units Combined)`	VOC—	1.6 tpyannual	combined—	p. 14 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22 and EG-70 through EG-73 (All Units Combined)`	PM10—	1.8 tpyannual	combined—	p. 14 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-13 through EG-22 and EG-70 through EG-73 (All Units Combined)`	PM2.5—	1.8 tpyannual	combined—	p. 14 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 (All Units Combined)`	NOx as NO2—	11.64 tpyannual	combined—	p. 15 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 (All Units Combined)`	NOx as NO2—	0.97 tpyannual	combined—	p. 15 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 (All Units Combined)`	VOC—	0.42 tpyannual	combined—	p. 15 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 (All Units Combined)`	PM10—	0.17 tpyannual	combined—	p. 15 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-74 through EG-80 (All Units Combined)`	PM2.5—	0.17 tpyannual	combined—	p. 15 ↗Machine-extracted from an official permit limit table; header grouping requires second review.

DOCUMENT HISTORY

What this document says it changes

amended or superseding permit document

Explicitly supersedes the document dated 2023-02-21.

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.

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