# Mayhew Plant

- **MSHA mine ID:** 0403871
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Riverside, CA
- **Operator:** MAMR LLC DBA Maitri Road Recycling
- **Controller:** Chandler Mayhew LLC; Mayhew Land Co LLC
- **Public source rows linked:** 980
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Chandler Mayhew LLC; Mayhew Land Co LLC (0187900) → MAMR LLC DBA Maitri Road Recycling (0124230) → Mayhew Plant (0403871)**

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

## Controller and operator valid-time history

- **Ronald W Pharris → C L Pharris Sand & Gravel Inc:** 1950-01-01 through 1992-01-17; derived from co-tenure at mine 0403871; source `msha-controller-operator-history`.
- **Cemex S A → Cemex USA Construction Materials Inc:** 1992-01-18 through 2001-12-31; derived from co-tenure at mine 0403871; source `msha-controller-operator-history`.
- **Cemex S A → Cemex Construction Materials LP:** 2002-01-01 through 2009-08-19; derived from co-tenure at mine 0403871; source `msha-controller-operator-history`.
- **Cemex S A → Cemex Construction Materials Pacific LLC:** 2009-08-20 through 2012-06-30; derived from co-tenure at mine 0403871; source `msha-controller-operator-history`.
- **Patrick  Broyles et al → MAMR LLC DBA Maitri Road Recycling:** 2012-07-01 through 2024-09-16; derived from co-tenure at mine 0403871; source `msha-controller-operator-history`.
- **John  Robertson et al → MAMR LLC DBA Maitri Road Recycling:** 2012-07-01 through 2024-09-16; derived from co-tenure at mine 0403871; source `msha-controller-operator-history`.
- **Chandler Mayhew LLC et al → MAMR LLC DBA Maitri Road Recycling:** 2024-09-17 through current/open; derived from co-tenure at mine 0403871; source `msha-controller-operator-history`.
- **Mayhew Land Co LLC et al → MAMR LLC DBA Maitri Road Recycling:** 2024-09-17 through current/open; derived from co-tenure at mine 0403871; source `msha-controller-operator-history`.

- History rows: 8
- Typed edges: 19
- 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 13 historical accident/injury rows; 0 coded fatalities and 64 lost days across the published record.
2. **COMPLIANCE — 22 since 2021:** Violations and penalties 169 violation rows across the full record; 52 carry an S&S flag and $51,971 appears in current assessed amounts.
3. **HEALTH — 16 samples:** Occupational health samples 14 personal; 2 area. 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 8K employee hours and 17 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 3 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 6 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 75 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 56.14100 — Safety defects; examination, correction and records.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.11002 — Handrails and toeboards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11002
- **30 CFR 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **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 56.15001 — 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 56.18010 — First aid.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18010
- **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 56.9300 — 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
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 56.14110 — Flying or falling materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14110

## Source coverage

- **Accident, Injuries, and Illnesses:** 13 rows; 2000-11-22 through 2020-04-20; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2025-10-22 through 2025-10-22; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 2 rows; 2024-11-26 through 2024-11-26; source ID `msha-area-samples`
- **Assessed Violations:** 168 rows; 2000-05-24 through 2026-08-27; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2007-06-05 through 2007-06-05; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2023-11-02 through 2023-11-02; source ID `msha-conferences`
- **Contested Violations:** 1 rows; 2006-08-24 through 2006-08-24; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 221 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 58 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 8 rows; 1950-01-01 through 2012-07-01; source ID `msha-controller-operator-history`
- **Inspections:** 75 rows; 2000-05-24 through 2026-09-04; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 203 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 44 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:** 14 rows; 2001-06-06 through 2024-11-26; source ID `msha-personal-health-samples`
- **Violations:** 169 rows; 2000-05-24 through 2026-08-27; 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/mayhew-plant-0403871`
- JSON: `/api/v1/mines/mayhew-plant-0403871`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0403871/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0403871/relationships`
- MCP resource: `mine://0403871/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`