# DILLON ROAD PIT

- **MSHA mine ID:** 0404937
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Riverside, CA
- **Operator:** Superior Ready Mix Concrete L.P.
- **Controller:** Vulcan Materials Company
- **Public source rows linked:** 767
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Vulcan Materials Company (0071891) → Superior Ready Mix Concrete L.P. (L10579) → DILLON ROAD PIT (0404937)**

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

## Controller and operator valid-time history

- **James E. Simon Co., A Wyoming Corp → James E Simon Company:** 1988-02-01 through 2007-01-01; derived from co-tenure at mine 0404937; source `msha-controller-operator-history`.
- **J Brouwer Investments Inc Et Al → Superior Ready Mix Concrete L.P.:** 2007-01-02 through 2025-04-27; derived from co-tenure at mine 0404937; source `msha-controller-operator-history`.
- **Vulcan Materials Company → Superior Ready Mix Concrete L.P.:** 2025-04-28 through current/open; derived from co-tenure at mine 0404937; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 8
- 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 64 lost days across the published record.
2. **COMPLIANCE — 32 since 2021:** Violations and penalties 159 violation rows across the full record; 40 carry an S&S flag and $27,725 appears in current assessed amounts.
3. **HEALTH — 16 samples:** Occupational health samples 16 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 6K employee hours and 13 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 16 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 1 civil-penalty docket/decision rows, and 15 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 — 16 since 2021:** Inspections 66 inspection events and 976 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 56.14200 — Warnings prior to starting or moving equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14200
- **30 CFR 56.13015 — Inspection of compressed-air receivers and other unfired pressure vessels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-L/section-56.13015
- **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 56.16001 — Stacking and storage of materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16001
- **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 56.12004 — Electrical conductors.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.15001 — First-aid materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15001
- **30 CFR 56.12013 — Splices and repairs of power cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12013
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 7 rows; 2000-04-01 through 2019-02-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-10-01 through 2011-10-01; source ID `msha-addresses`
- **Assessed Violations:** 158 rows; 2000-06-20 through 2026-04-08; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2004-03-19 through 2004-03-19; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 15 rows; 2002-02-04 through 2003-06-26; source ID `msha-conferences`
- **Contractor Employment and Production — Quarterly:** 60 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 14 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1988-02-01 through 2007-01-02; source ID `msha-controller-operator-history`
- **Inspections:** 66 rows; 2000-06-20 through 2026-09-24; 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:** 16 rows; 2002-05-14 through 2026-09-24; source ID `msha-personal-health-samples`
- **Violations:** 159 rows; 2000-06-20 through 2026-04-08; 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/dillon-road-pit-0404937`
- JSON: `/api/v1/mines/dillon-road-pit-0404937`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0404937/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0404937/relationships`
- MCP resource: `mine://0404937/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`