# PLANT 25

- **MSHA mine ID:** 0404647
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** San Benito, CA
- **Operator:** Don Chapin Company Inc
- **Controller:** Donald D  Chapin Jr
- **Public source rows linked:** 330
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Donald D  Chapin Jr (M12487) → Don Chapin Company Inc (L16318) → PLANT 25 (0404647)**

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

## Controller and operator valid-time history

- **Henry  Matoza Jr → Hillsdale Rock Company:** 1983-06-01 through 1998-07-31; derived from co-tenure at mine 0404647; source `msha-controller-operator-history`.
- **Donald D  Chapin Jr → Don Chapin Company Inc:** 1998-08-01 through current/open; derived from co-tenure at mine 0404647; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 6
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 1 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 4 since 2021:** Violations and penalties 65 violation rows across the full record; 9 carry an S&S flag and $5,777 appears in current assessed amounts.
3. **HEALTH — 18 samples:** Occupational health samples 18 personal. 0 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 4K employee hours and 14 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 29 linked rows:** Contests, conferences and decisions 12 contested-violation rows, 12 civil-penalty docket/decision rows, and 5 conference records linked by issuance number.
6. **CONTRACTORS — 0 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 — 20 since 2021:** Inspections 70 inspection events and 768 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 56.12004 — Electrical conductors.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.20010 — Retaining dams.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20010
- **30 CFR 56.4200 — General requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4200
- **30 CFR 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **30 CFR 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **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 56.12021 — Danger signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12021
- **30 CFR 56.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300

## Source coverage

- **Accident, Injuries, and Illnesses:** 1 rows; 2015-08-06 through 2015-08-06; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1991-12-17 through 1991-12-17; source ID `msha-addresses`
- **Assessed Violations:** 65 rows; 2001-06-21 through 2025-01-29; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 12 rows; 2013-09-12 through 2025-01-22; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 5 rows; 2014-03-10 through 2025-03-27; source ID `msha-conferences`
- **Contested Violations:** 12 rows; 2010-03-30 through 2024-05-21; source ID `msha-contested-violations`
- **Controller and Operator History:** 2 rows; 1983-06-01 through 1998-08-01; source ID `msha-controller-operator-history`
- **Inspections:** 70 rows; 2000-10-04 through 2026-08-10; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 24 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 18 rows; 2003-03-27 through 2026-08-11; source ID `msha-personal-health-samples`
- **Violations:** 65 rows; 2001-06-21 through 2025-01-29; 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/plant-25-0404647`
- JSON: `/api/v1/mines/plant-25-0404647`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0404647/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0404647/relationships`
- MCP resource: `mine://0404647/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`