Page-cited permit extraction

Sentinel Ashburn Nexus

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 74156-1, 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 ↗.

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

2 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
	emergency engine generator setMTU · em	1 units3000 kW each	diesel fuel oil—	See operating-scope table—	p. 4 ↗Machine-extracted from explicit permit prose: Equipment Description Rated Requirements Capacity A-1-a, b, c, d, and A-2-e, f, g Eighteen (18) MTU &i 4,680 bhp emergency diesel engine B-1-a, b, c, d, 3,000 ekW None gen-set model 20V4000 and B-1-i, B-2- (each unit) DS3000 e, f, g, h and B- 2-n A-1-j, A-2-k, Six (6) MTU em
	engine generator set—	3 units2000 kW each	diesel fuel oil—	See operating-scope table—	p. 4 ↗Machine-extracted from explicit permit prose: ergency 3,058 bhp A-2-m, and diesel engine gen-sets model 2,000 ekW None B-1-j, B-2-k, 16V4000 DS2000 (each unit) B-2-m Specifications included in the

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
`A-1-a, b, c, d and A-2-e, f, g & i, B-1- a, b, c, d and i, B-2-e, f, g, h and B-2-n, and A-1-j, A-2-k`	135 hours/year	and B-2-m) are limited by the following: a. Each emergency diesel engine gen-set (Ref. Nos. A-1-a, b, c, d and A-2-e, f, g & i, B-1- a, b, c, d and i, B-2-e, f, g, h and B-2-n, and A-1-j, A-2-k, A-2-m and B-1-j, B-2-k, and B- 2-m) shall not operate more than 135 hours per year for all purposes (as provided in Condition 4) combined, calculated monthly as the sum of each consecutive 12-month period. b. Each individual diesel engine-generator set shall not operate more than 100 hours per year foMachine-extracted normative operating-hours statement; second review pending.	p. 7 ↗
`A-1-a, b, c, d and A-2-e, f, g`	100 hours/year	k, and B- 2-m) shall not operate more than 135 hours per year for all purposes (as provided in Condition 4) combined, calculated monthly as the sum of each consecutive 12-month period. b. Each individual diesel engine-generator set shall not operate more than 100 hours per year for maintenance checks and readiness testing. These annual limits shall be calculated monthly as the sum of each consecutive 12-month period. c. The diesel engine-generator sets (Ref. Nos. A-1-a, b, c, d and A-2-e, f, gMachine-extracted normative operating-hours statement; second review pending.	p. 7 ↗
`A-1-a, b, c, d and A-2-e, f, g & i, B-1-a, b, c, d and i, B-2-e, f, g, h and B-2-n, and A-1-j, A-2-k,`	672 hours/year	of each consecutive 12-month period. c. The diesel engine-generator sets (Ref. Nos. A-1-a, b, c, d and A-2-e, f, g & i, B-1-a, b, c, d and i, B-2-e, f, g, h and B-2-n, and A-1-j, A-2-k, A-2-m and B-1-j, B-2-k, and B-2-m), combined, shall not operate more than 672 hours per year for maintenance checks and readiness testing1, calculated monhly as the sum of each consecutive 12-month period. The permittee may petition DEQ-NROA ir Compliance Managerf or approval of additional hours to be used forMachine-extracted normative operating-hours statement; second review pending.	p. 7 ↗

Permitted emission limits

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

Inspect 3 transcribed limit rows

Pollutant	Limit	Basis / scope	Source
visible emissions—	5 percent opacityvisible	——	p. 9 ↗Machine-extracted from a page line in an older official PDF; literal context: 10. Visible Emission Limit - Visible emissions from each emergency diesel engine gen-set (Ref. Nos. A-1-a, b, c, d and A-2-e, f, g & i, B-1-a, b, c, d and i, B-2-e, f, g, h and B-2-n, and A-1-j, A-2-k, A-2-m and B-1-j, B-2-k, and B-2-m) shall not exceed 5% opacity except during one six-minute period in any one hour in which visible emissions shall not exceed 10%
visible emissions—	10 percent opacityvisible	——	p. 9 ↗Machine-extracted from a page line in an older official PDF; literal context: (Ref. Nos. A-1-a, b, c, d and A-2-e, f, g & i, B-1-a, b, c, d and i, B-2-e, f, g, h and B-2-n, and A-1-j, A-2-k, A-2-m and B-1-j, B-2-k, and B-2-m) shall not exceed 5% opacity except during one six-minute period in any one hour in which visible emissions shall not exceed 10% opacity as determined by the EPA Method 9 (reference 40 CFR 60, AppendixA ).
visible emissions—	20 percent opacityvisible	——	p. 9 ↗Machine-extracted from a page line in an older official PDF; literal context: b, c, d and A-2-e, f, g & i, B-1-a, b, c, d and i, B-2-e, f, g, h and B-2-n, and A-1-j, A-2-k, A-2- m and B-1-j, B-2-k, and B-2-m) shall not exceed 10% opacity except during one 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

No separate amendment-history row is published for this Release 2 record.

QA NOTES

Ambiguity stays visible

Machine-extracted candidate. Verify every reused value against the cited official PDF page.
Prose fallback; verify equipment grouping.
Confirm whether the limit is per unit, combined, or limited to testing/maintenance.
Older-PDF text fallback; verify row and unit alignment.

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