# West Coast Aggregate Supply Inc

- **MSHA mine ID:** 0404209
- **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:** 755
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**John R  Struiksma (0197580) → West Coast Aggregate Supply Inc (L17526) → West Coast Aggregate Supply Inc (0404209)**

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

## Controller and operator valid-time history

- **Van Cautern Margaret → Vans Rock & Sand:** 1950-01-01 through 1979-01-25; derived from co-tenure at mine 0404209; source `msha-controller-operator-history`.
- **Kenneth P  Maness → Valley Rock & Sand Inc:** 1979-01-26 through 1984-03-13; derived from co-tenure at mine 0404209; source `msha-controller-operator-history`.
- **Steve  Holliday → Valley Gravel Inc:** 1984-03-14 through 1988-06-07; derived from co-tenure at mine 0404209; source `msha-controller-operator-history`.
- **Wayne  Reeder → Valley Rock & Sand Inc:** 1988-06-08 through 1992-02-29; derived from co-tenure at mine 0404209; source `msha-controller-operator-history`.
- **David B  Blomgren  et al → Valley Rock & Sand Inc:** 1992-03-01 through 2000-06-18; derived from co-tenure at mine 0404209; source `msha-controller-operator-history`.
- **Marvin J  Struiksma et al → West Coast Aggregate Supply Inc:** 2000-06-19 through 2026-01-26; derived from co-tenure at mine 0404209; 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 0404209; source `msha-controller-operator-history`.

- History rows: 7
- Typed edges: 20
- 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 1 historical accident/injury rows; 0 coded fatalities and 161 lost days across the published record.
2. **COMPLIANCE — 31 since 2021:** Violations and penalties 182 violation rows across the full record; 40 carry an S&S flag and $35,594 appears in current assessed amounts.
3. **HEALTH — 11 samples:** Occupational health samples 11 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 15K employee hours and 24 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 23 linked rows:** Contests, conferences and decisions 7 contested-violation rows, 7 civil-penalty docket/decision rows, and 9 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 — 27 since 2021:** Inspections 81 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 56.12028 — 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 56.14107 — Moving machine parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 41.12 — Changes; notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.12
- **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 56.12004 — 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 56.12008 — Insulation and fittings for power wires and cables.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 46.4 — Training plan implementation.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.4
- **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
- **30 CFR 56.14205 — Machinery, equipment, and tools.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14205

## Source coverage

- **Accident, Injuries, and Illnesses:** 1 rows; 2005-10-28 through 2005-10-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-10-01 through 2011-10-01; source ID `msha-addresses`
- **Assessed Violations:** 182 rows; 2000-02-28 through 2026-04-29; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 7 rows; 2010-09-30 through 2012-10-10; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 9 rows; 2001-08-15 through 2008-12-23; source ID `msha-conferences`
- **Contested Violations:** 7 rows; 2010-02-10 through 2011-10-19; source ID `msha-contested-violations`
- **Controller and Operator History:** 7 rows; 1950-01-01 through 2000-06-19; source ID `msha-controller-operator-history`
- **Inspections:** 81 rows; 2000-02-28 through 2026-08-24; 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:** 11 rows; 2001-08-01 through 2023-08-11; source ID `msha-personal-health-samples`
- **Violations:** 182 rows; 2000-02-28 through 2026-04-29; 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/west-coast-aggregate-supply-inc-0404209`
- JSON: `/api/v1/mines/west-coast-aggregate-supply-inc-0404209`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0404209/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0404209/relationships`
- MCP resource: `mine://0404209/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`