# Rocky Canyon Plant

- **MSHA mine ID:** 0404634
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Granite
- **Location:** San Luis Obispo, CA
- **Operator:** Calportland Construction
- **Controller:** Taiheiyo Cement Corp
- **Public source rows linked:** 1,143
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Taiheiyo Cement Corp (M07897) → Calportland Construction (L11900) → Rocky Canyon Plant (0404634)**

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

## Controller and operator valid-time history

- **David P  Grimsley → Rocky Canyon Sand & Gravel Inc:** 1983-04-01 through 1985-06-16; derived from co-tenure at mine 0404634; source `msha-controller-operator-history`.
- **Steven F  Will Et Al → Union Asphalt Inc:** 1985-06-17 through 2008-03-26; derived from co-tenure at mine 0404634; source `msha-controller-operator-history`.
- **Andy C  Hermreck Et Al → Union Asphalt Inc:** 1985-06-17 through 2008-03-26; derived from co-tenure at mine 0404634; source `msha-controller-operator-history`.
- **Taiheiyo Cement Corp → Calportland Construction:** 2008-03-27 through current/open; derived from co-tenure at mine 0404634; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 10
- 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 — 4 since 2021:** Accidents and injuries 7 historical accident/injury rows; 0 coded fatalities and 396 lost days across the published record.
2. **COMPLIANCE — 26 since 2021:** Violations and penalties 136 violation rows across the full record; 29 carry an S&S flag and $41,389 appears in current assessed amounts.
3. **HEALTH — 25 samples:** Occupational health samples 25 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 6K employee hours and 13 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 5 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 civil-penalty docket/decision rows, and 3 conference records linked by issuance number.
6. **CONTRACTORS — 1 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 — 14 since 2021:** Inspections 59 inspection events and 1K 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 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **30 CFR 56.20003 — Housekeeping.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.18002 — Examination of working places.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **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 56.12019 — Access to stationary electrical equipment or switchgear.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12019
- **30 CFR 46.7 — New task training.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.7
- **30 CFR 56.12030 — Correction of dangerous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **30 CFR 56.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 47.44 — Temporary, portable containers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.44

## Source coverage

- **Accident, Injuries, and Illnesses:** 7 rows; 2006-10-18 through 2026-07-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1983-04-11 through 1983-04-11; source ID `msha-addresses`
- **Assessed Violations:** 136 rows; 2001-07-10 through 2026-04-22; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2012-07-11 through 2012-07-11; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2006-10-03 through 2019-03-28; source ID `msha-conferences`
- **Contested Violations:** 1 rows; 2011-06-01 through 2011-06-01; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 426 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 77 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1983-04-01 through 2008-03-27; source ID `msha-controller-operator-history`
- **Inspections:** 59 rows; 2001-07-10 through 2026-04-21; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 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:** 25 rows; 2003-06-10 through 2026-04-23; source ID `msha-personal-health-samples`
- **Violations:** 136 rows; 2001-07-10 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/rocky-canyon-plant-0404634`
- JSON: `/api/v1/mines/rocky-canyon-plant-0404634`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0404634/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0404634/relationships`
- MCP resource: `mine://0404634/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`