Page-cited permit extraction

Microsoft Corp Blue Ridge (IAD11-12-13) Data Center

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 74221-4, 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 ↗.

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

5 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-58 and EG-59`	emergency engine generator setCaterpillar · C32	2 units1000 kW each	diesel fuel oil—	See operating-scope table—	p. 5 ↗Machine-extracted from an official document equipment table; column grouping requires second review.
`FWP-01`	fire-pump engineJohn Deere	1 units48 kW each	diesel fuel oil—	See operating-scope table—	p. 5 ↗Machine-extracted from an official document equipment table; column grouping requires second review.
`EG-01`	emergency engine generator setCaterpillar · C15	1 units500 kW each	diesel fuel oil—	See operating-scope table—	p. 5 ↗Machine-extracted from an official document equipment table; column grouping requires second review.
`EG-02 – EG-21`	emergency engine generator setCaterpillar · C175-16	20 units3100 kW each	diesel fuel oil—	See operating-scope table—	p. 5 ↗Machine-extracted from an official document equipment table; column grouping requires second review.
`EG-22 – EG-57`	emergency engine generator setCaterpillar · C175-16	36 units3100 kW each	diesel fuel oil—	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-01 through EG-59`	36 hours/year	Microsoft Blue Ridge (IAD11-12-13) Data Center Registration Number: 74221 July 21st, 2025 Page 7 7. Operating Hours – Each individual emergency diesel engine gen-set (Ref. Nos. EG-01 through EG-59) shall not operate more than 36 hours per year for scheduled maintenance checks and readiness testing (Scheduled MCRT, as provided in Condition 6.c). Each individual emergency diesel engine gen-set (Ref. Nos. EG-01 through EG-59) shall not operate more than 500 hourMachine-extracted normative operating-hours statement; second review pending.	p. 9 ↗
`EG-01 through EG-59`	500 hours/year	9) shall not operate more than 36 hours per year for scheduled maintenance checks and readiness testing (Scheduled MCRT, as provided in Condition 6.c). Each individual emergency diesel engine gen-set (Ref. Nos. EG-01 through EG-59) shall not operate more than 500 hours per year for all purposes (as provided in Condition 6) 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. 9 ↗
`FWP-01`	500 hours/year	demonstrated monthly by adding the total for the most recently completed calendar month to the individual monthly totals for the preceding 11 months. (9VAC5-80-1180) [7/21/2025] 8. Operating Hours – The fire pump (Ref. No. FWP-01) shall not operate more than 500 hours per year for all purposes. The annual limits for hours of operation shall be calculated daily as the sum of each consecutive 365-day period. Compliance for the consecutive 365-day period shall be demonstrated daily by adding theMachine-extracted normative operating-hours statement; second review pending.	p. 9 ↗

Permitted emission limits

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

Inspect 27 transcribed limit rows

Reference	Pollutant	Limit	Basis / scope	Source
`Ref. Nos. EG-01`	NOx as NO2—	8.30 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-02 through EG-57`	NOx as NO2—	57.89 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG- 58 and EG-59`	NOx as NO2—	19.40 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. No. FWP-01`	NOx as NO2—	0.49 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01`	NOx as NO2—	2.20 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-02 through EG-57`	NOx as NO2—	7.46 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG- 58 and EG-59`	NOx as NO2—	2.79 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. No. FWP-01`	NOx as NO2—	0.11 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01`	VOC—	0.11 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-02 through EG-57`	VOC—	0.85 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG- 58 and EG-59`	VOC—	0.34 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. No. FWP-01`	VOC—	0.04 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01`	PM10—	0.18 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-02 through EG-57`	PM10—	0.39 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG- 58 and EG-59`	PM10—	0.23 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. No. FWP-01`	PM10—	0.02 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01`	PM2.5—	0.18 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-02 through EG-57`	PM2.5—	0.39 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG- 58 and EG-59`	PM2.5—	0.23 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. No. FWP-01`	PM2.5—	0.02 lb/hrhourly	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01 through EG-59, and FWP-01`	NOx as NO2—	94.48 tpyannual	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01 through EG-59, and FWP-01`	NOx as NO2—	40.12 tpyannual	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01 through EG-59, and FWP-01`	VOC—	6.71 tpyannual	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01 through EG-59, and FWP-01`	PM10—	2.78 tpyannual	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
`Ref. Nos. EG-01 through EG-59, and FWP-01`	PM2.5—	2.78 tpyannual	——	p. 11 ↗Machine-extracted from an official permit limit table; header grouping requires second review.
	visible emissions—	10 percent opacityvisible	——	p. 12 ↗Machine-extracted from a page line in an older official PDF; literal context: July 21st, 2025 Page 10 emissions shall not exceed 10% opacity as determined by EPA Method 9 (reference 40 CFR 60, Appendix A). This condition applies at all times except during startup, shutdown
	visible emissions—	20 percent opacityvisible	——	p. 12 ↗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 and fire pump shall not exceed 10% opacity except during one 6-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

amended or superseding permit document

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

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.

← Return to evidence index