# West Coast Aggregate Supply Inc

- **MSHA mine ID:** 0404731
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Riverside, CA
- **Operator:** West Coast Aggregate Supply Inc
- **Controller:** John R  Struiksma
- **Public source rows linked:** 587
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**John R  Struiksma (0197580) → West Coast Aggregate Supply Inc (L17526) → West Coast Aggregate Supply Inc (0404731)**

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

## Controller and operator valid-time history

- **Steve  Holliday → Valley Gravel Inc:** 1984-11-01 through 1988-06-07; derived from co-tenure at mine 0404731; source `msha-controller-operator-history`.
- **Wayne  Reeder → R Bar C Inc:** 1988-06-08 through 1991-06-30; derived from co-tenure at mine 0404731; source `msha-controller-operator-history`.
- **David B  Blomgren  et al → R-Bar-C Inc:** 1991-07-01 through 2000-06-30; derived from co-tenure at mine 0404731; source `msha-controller-operator-history`.
- **Marvin J  Struiksma et al → West Coast Aggregate Supply Inc:** 2000-07-01 through 2026-01-26; derived from co-tenure at mine 0404731; source `msha-controller-operator-history`.
- **John R  Struiksma et al → West Coast Aggregate Supply Inc:** 2026-01-27 through current/open; derived from co-tenure at mine 0404731; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 14
- 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 — 33 since 2021:** Violations and penalties 213 violation rows across the full record; 60 carry an S&S flag and $59,113 appears in current assessed amounts.
3. **HEALTH — 15 samples:** Occupational health samples 15 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 5K employee hours and 8 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 8 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 0 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 — 15 since 2021:** Inspections 63 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 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 56.20003 — Housekeeping.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.14107 — Moving machine parts.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.4102 — Spillage and leakage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4102
- **30 CFR 56.11003 — Construction and maintenance of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11003
- **30 CFR 56.12018 — Identification of power switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **30 CFR 56.12025 — Grounding circuit enclosures.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12025
- **30 CFR 56.4203 — Extinguisher recharging or replacement.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4203
- **30 CFR 56.18002 — Examination of working places.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.14109 — Unguarded conveyors with adjacent travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14109

## Source coverage

- **Accident, Injuries, and Illnesses:** 1 rows; 2010-12-28 through 2010-12-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-10-01 through 2011-10-01; source ID `msha-addresses`
- **Assessed Violations:** 212 rows; 2000-10-03 through 2026-04-30; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2017-11-29 through 2019-12-04; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 4 rows; 2017-04-12 through 2019-07-02; source ID `msha-contested-violations`
- **Controller and Operator History:** 5 rows; 1984-11-01 through 2000-07-01; source ID `msha-controller-operator-history`
- **Inspections:** 63 rows; 2000-10-03 through 2026-04-30; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 15 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 53 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:** 15 rows; 2003-05-13 through 2023-08-17; source ID `msha-personal-health-samples`
- **Violations:** 213 rows; 2000-10-03 through 2026-04-30; 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/west-coast-aggregate-supply-inc-0404731`
- JSON: `/api/v1/mines/west-coast-aggregate-supply-inc-0404731`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0404731/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0404731/relationships`
- MCP resource: `mine://0404731/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`