# Carderock Quarries

- **MSHA mine ID:** 1800404
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Montgomery, MD
- **Operator:** Tri-State Stone & Building Supply Inc.
- **Controller:** Porto Family Dynasty Trust 1; Brian A Porto et  al
- **Public source rows linked:** 834
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Porto Family Dynasty Trust 1; Brian A Porto et  al (M39624) → Tri-State Stone & Building Supply Inc. (L39624) → Carderock Quarries (1800404)**

Current identity source: `msha-mines`. This is a current snapshot, not a historical claim.

## Controller and operator valid-time history

- **Brian A Porto et  al → Tri-State Stone & Building Supply Inc.:** 1950-01-01 through current/open; derived from co-tenure at mine 1800404; source `msha-controller-operator-history`.
- **Porto Family Dynasty Trust 1 et al → Tri-State Stone & Building Supply Inc.:** 1950-01-01 through current/open; derived from co-tenure at mine 1800404; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 4
- Interval anomalies: 0
- Valid-time bounds: inclusive; date granularity; null end means open-ended in the upstream history row; not independent proof of present control.
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 7 historical accident/injury rows; 0 coded fatalities and 305 lost days across the published record.
2. **COMPLIANCE — 17 since 2021:** Violations and penalties 98 violation rows across the full record; 12 carry an S&S flag and $10,970 appears in current assessed amounts.
3. **HEALTH — 24 samples:** Occupational health samples 24 personal. 1 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
4. **PRODUCTION — 0 tons:** Quarterly production and employment 14K employee hours and 25 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 118 linked rows:** Contests, conferences and decisions 39 contested-violation rows, 62 civil-penalty docket/decision rows, and 17 conference records linked by issuance number.
6. **CONTRACTORS — 2 linked entities:** Contractors Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
7. **INSPECTIONS — 13 since 2021:** Inspections 60 inspection events and 906 published inspection hours across the historical record.

## EIA annual operating context

No matched record in the 2024 EIA coal-public workbook. This may be inapplicable for a non-coal operation.

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 56.3131 — Pit or quarry wall perimeter.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-B/section-56.3131
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 62.120 — Action level.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-M/part-62/section-62.120
- **30 CFR 56.15004 — Eye protection.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15004
- **30 CFR 56.18010 — First aid.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18010
- **30 CFR 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **30 CFR 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101

## Source coverage

- **Accident, Injuries, and Illnesses:** 7 rows; 2000-05-17 through 2013-08-06; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2003-10-01 through 2003-10-01; source ID `msha-addresses`
- **Assessed Violations:** 97 rows; 2001-07-12 through 2026-04-22; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 62 rows; 2000-12-01 through 2026-08-07; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 17 rows; 2003-09-30 through 2006-06-22; source ID `msha-conferences`
- **Contested Violations:** 39 rows; 2006-03-23 through 2026-04-22; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 108 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 18 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 1950-01-01 through 1950-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 60 rows; 2001-07-12 through 2026-04-21; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 245 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 55 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 24 rows; 2001-07-17 through 2026-04-22; source ID `msha-personal-health-samples`
- **Violations:** 98 rows; 2001-07-12 through 2026-04-22; source ID `msha-violations`

## Caveats

- This is public-record decision support, not legal advice or an official MSHA record.
- Missing data can indicate no event, publication delay, an unresolved identity, or inapplicability.
- Contractor production data is entity-level and is not attributed to this mine.

## Alternate representations

- HTML: `/mines/carderock-quarries-1800404`
- JSON: `/api/v1/mines/carderock-quarries-1800404`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1800404/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1800404/relationships`
- MCP resource: `mine://1800404/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`